Abstract
In many oil reservoirs worldwide, the downhole pressure does not have the ability to lift the produced fluids to the surface. In order to produce these fluids, pumps are used to artificially lift the fluids; this method is referred to as artificial lift. More than seventy percent of all currently producing oil wells are being produced by artificial lift methods. One of the most applied artificial lift methods is sucker rod pump. Sucker rod pumps are considered a well-established technology in the oil and gas industry and thus are easy to apply, very common worldwide, and low in capital and operational costs. Many advancements in technology have been applied to improve sucker rod pumps performance, applicability range, and diagnostics. With these advancements, it is important to be able to constantly provide an updated review and guide to the utilization of the sucker rod pumps. This research provides an updated comprehensive review of sucker rod pumps components, diagnostics methods, mathematical models, and common failures experienced in the field and how to prevent and mitigate these failures. Based on the review conducted, a new classification of all the methods that can fall under the sucker rod pump technology based on newly introduced sucker rod pump methods in the industry has been introduced. Several field cases studies from wells worldwide are also discussed in this research to highlight some of the main features of sucker rod pumps. Finally, the advantages and limitations of sucker rod pumps are mentioned based on the updated review. The findings of this study can help increase the understanding of the different sucker rod pumps and provide a holistic view of the beam rod pump and its properties and modeling.
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Introduction
Sucker rod pumps include a wide range of artificial lift methods (Diaz et al. 2009; Guo et al. 2003; Mo and Xu 2000; Spears 1989; Arambulo et al. 2020). With the advancement in technology, the types of artificial lift methods that fall under the sucker rod classification have increased (Gauchel 1985; Yi et al. 2019; Byrd and Hale 1970; Pino et al. 2020; Nickell 2020; Shakhmatov 2020). These methods are used to increase oil recovery from relatively low-rate wells that are producing moderate to heavy crude oils with a moderate level of gas and solid particles (McCaslin 1988; Jacobs 1986; Jackson et al. 2003). Sucker rod pumps are used widely in the industry due to their multiple advantages including relatively low cost, well established technology, availability, and wide applicability range (Martin 2012; Teodoriu and Pienknagura 2018; Takacs 1997; Takacs and Mihaly 2017; Takacs and Gajda 2014).
Several researchers have attempted to model the sucker rod pump using different methods. McCafferty (1993) illustrated the importance of calculating the maximum available compression ratio compared to the required compression ratio for sucker rod installation designs. Jennings (1989) showed some of the most important parameters that are needed for a proper design of the sucker rod pump. These parameters included reservoir rock and fluid properties, wellbore properties, and operational properties. Peng et al. (2019) used a deep autoencoder neural network to obtain features of the dynamometer card which can minimize information loss and improve data management. Langbauer and Antretter (2017) used finite element method for improvement of the sucker rod pump efficiency by increasing production and reducing cost and failure. Using finite element method managed to improve sucker rod performance by 30%. Ferrigno et al. (2018) compared the results of the dynamometer cards obtained from controllers and telemetry with other software that consider friction effects in deviated wells. Chen et al. (2018) used the Fourier series method to solve sucker rod prediction problems using the conventional surface dynamometer card. Caicedo and Carma (2009) introduced another sucker rod analysis method other than the conventional dynamometer card. This method introduces and algorithm to generate piston tubing rod performance curve. Chevelcha et al. (2013) performed tests on the sucker rod pump in an attempt to obtain a relation between the noise produced by a well during sucker rod operation and its relation to the sucker rod condition.
Experimental and field analysis of sucker rod pumps have also been conducted to evaluate the importance of some factors on sucker rod performance and failure. Podio et al. (2003) presented results for tests with a sucker rod pump model in the laboratory to provide information on dynamic and static pump friction measurement. They reasoned that one of the major costs during production is the lifting cost. It should be optimized by minimizing down time, and increasing the pump efficiency through loss reduction. Xu and Hu (1993) showed that using the assumption that the sucker rod for deviated wells can be performed using the conventional vertical wells models can lead to serious errors. Dave and Mustafa (2017) presented a comparison between the different sucker rod artificial lift systems based on the production area, depth, downhole failures, power saving, and safety concerns. Allison et al. (2018) studied the impact of gas on sucker rod pumps and found that they have the advantages of tolerating gas production without damage to the pump itself, however the overall volumetric efficiency of the pump is reduced significantly due to gas presence, up to 40%. Ali et al. (2015) performed a screening criterion for sucker rod pumps and compared their performance to that of electrical submersible pumps. Gauchel (1985) presented the results for a test design for fiber glass sucker rods to determine tensile, shear, and tensile/tensile fatigue performance as a function of temperature. Reynolds (1988) performed a review on the advantages of fiberglass sucker rods compared to steel sucker rods.
Many researchers have studied the sucker rod pump and attempted to improve its design and applicability. Very few have attempted to combine this knowledge together in order to provide a holistic review on the most current advancements in the sucker rod pump. Also, since new sucker rod designs are being added under the sucker rod classification, a new comprehensive classification of what types of artificial lift pumps can fall under the naming of the sucker rod pump is needed. This research addresses these gaps by performing a comprehensive review of the main type of sucker rod pumps, the beam rod pump, components, diagnostics methods, mathematical models, and common failures experienced in the field and how to prevent and mitigate these failures. The research also provides a new classification of all methods that can fall under the sucker rod pump technology based on newly introduced sucker rod pump methods in the industry. The main focus of this review is the beam rod pumping unit since it is the main type of sucker rod pumps and is also the most widely used worldwide.
The research begins by introducing a new classification of sucker rod pumps based on the novel pump designs that have been recently introduced in the industry. Following this, the main focus of the research is on the beam rod pump, which is the most widely used sucker rod pump. The components of the beam rod pump are explained in detail, along with the diagnostics methods used to evaluate the performance of the beam rod pump. The most widely applied mathematical models used with the beam rod pump are then mentioned and explained. This is followed by a detailed failure analysis of the beam rod pump based on field studies. For all the failure mechanisms, a mitigation recommendation is also provided based on the comprehensive literature review. Advancements in the beam rod system are then mentioned and the added value of each advancement is explained. Finally, beam rod pump case studies worldwide are mentioned along with their results and the beneficial information gained from each case study. Using all the data collected, the advantages and limitations of the beam rod pump are then mentioned. Figure 1 shows a flowchart for the research conducted and the problems studied.
Sucker rod pump classification
Sucker rod pumps include a wide range of methods used to increase oil recovery. Since classifications have varied significantly along the years mainly due to the development of new technologies, the first step in this research is to include a new classification of sucker rod pumps that includes all the new technological developments that fall under this category.
Beam rod pumping
The beam rod pumping unit is the most applied sucker rod method (Jalikop et al. 2020), shown in Fig. 2. This method will also be the main focus of this research. It is mainly composed of a surface unit and downhole pump and rods. The surface unit has multiple variations based on the size and application. The three main types are the Type A, C, and M beam rod. Type A (Air balanced) uses compressed air to counterbalance the load that comes from the rods. Type A has the benefit of reduced weight and lower installation and transportation cost. Type M (Mark II) lowers the torque and power requirements throughout the pumping cycle. Type C is the conventional beam rod pump; a detailed description of this type will be provided in this review (Teodoriu and Pienknagura 2018).
Coiled tubing sucker rod
The use of coiled tubing as sucker rods is mainly performed in small diameter holes. This technology was first applied in Argentina and was then used in the USA and Canada (Parekh and Desai 2013). It has the advantage of reducing cost since the coiled tubing acts as both the production string and the sucker rod. This method also reduces time during well intervention jobs and allows the conduction of various operations in live wells without the need of kill fluid. An example of coiled tubing sucker rod is presented in Fig. 3. Some of key design parameters in this type of sucker rod pump are the coiled tubing material, fatigue failure analysis, corrosion resistance, completion design, non-return valve (one way valve), gas separation, and surface facilities (Parekh and Desai 2013).
Hydraulically actuated sucker rods
Hydraulically actuated sucker rods have been present since the 1940s. They contain a hydraulic cylinder at the surface used to impart a reciprocating motion on the polished rod and the rod string, and the downhole assembly which is almost identical to the conventional beam unit (Phillips et al. 2013). Figure 4 presents an illustration of the surface components of the hydraulically actuated sucker rod pump.
The hydraulically actuated sucker rod pump has the following advantages (Phillips et al. 2013):
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Is not subject to damaging torque limitations.
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Has no structural loading concerns.
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Polished rod velocity is linear for the majority of the stroke
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Can operate at depths up to 14,000 ft
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Can operate in high rate wells with thousands of bpd
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Can operate in shallow wells.
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Better paraffin, solids, and gas handling
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Has dual well capabilities
The two main limitations of the hydraulically actuated sucker rod pump include high maintenance cost and frequent failures compared to the conventional beam pumping unit.
Linear rod pumping
Linear rod pumping has the advantage of removing the bulky surface components of the conventional beam pumping unit. This increases the applicability of the sucker rod artificial lift method by allowing it to be used when the surface space is limited where size is important, most notably in offshore applications. The downhole components are very similar to those of the conventional beam pumping unit (Khadav et al. 2016; Lima and Neto 2020). An illustration of the linear rod pumping unit surface components is presented in Fig. 5.
Long stroke sucker rod
The long stroke sucker rod is one of the least utilized sucker rod methods. It could be considered a variation of the linear rod pumping. It is designed to increase the stroke length of the sucker rod string in order to increase applicability of sucker rod pumps in deeper wells with higher capacity and reduction in fatigue (Dave et al. 2017; Teodoriu and Pienknagura 2018). An image of the surface components of the long stroke sucker rod is shown in Fig. 6.
Adjustable counterbalance sucker rod pump
Oliva et al. (2020) developed an adjustable counterbalance sucker rod pumping unit that they referred to as “smart sucker rod pump” which can adjust the counterbalance and the polished rod stroke length without the needed for personnel to go to the field. The adjustable counterbalance sucker rod system has the advantage of being able to adjust the polished rod stroke range easily, and the counterweight can also be adjusted at any position inside the adaptable grid. A comparison between the conventional beam pumping unit and the adjustable counterbalance sucker rod pump is shown in Fig. 7.
Beam rod pump components
The conventional beam rod pumping unit consists of surface components and downhole components. These components all function together to allow for the production of the hydrocarbons from the wellbore to the surface (Di et al. 2018). The main components of the beam pumping unit, shown in Fig. 8, are as follows:
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Prime Mover The prime mover converts the energy provided through electricity or a diesel engine into motion that is transmitted to the gear box.
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Gear Box The gear box is the main mechanism by which the surface component motion is controlled.
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Counterbalance The counterbalance works to balance the weight of the horse head as it moves up and down to allow for smooth and regulated operation and to reduce wear of the surface components.
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Horse Head (Pumping Unit) The horse hear is the surface pumping unit that move up and down to allow the downhole pump components to operate. It carries the weight of the string.
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Polished Rod The polished rod is the topmost sucker rod. It is usually designed from more durable material compared to the other sucker rods since it is carrying the entire weight of the string.
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Stuffing Box Its main function is to prevent leakage of fluid by providing a seal between the components.
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Tubing The tubing is the piping through which the fluid is produced after it travels through the sucker rods.
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Rod String (Sucker Rods) The sucker rods make up the main length of the string. They are specially shaped in order to accommodate the fluids and work with the overall design.
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Downhole Pump The downhole pump is composed of several components mainly the traveling valve and the standing valves. During the upstroke, the traveling valve closes and the fluid above the plunger is lifted. This allows the barrel to fill up with fluid through the standing valve. During the downstroke, the standing valve closes and the fluid is compressed thus allowing the fluid to move through the traveling valve.
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Flowline The produced fluids flow into the flowline in the surface in order to be transported to the refinery.
Beam rod pump diagnostic methods
The main method by which beam rod pumps diagnostics is conducted is the dynamometer card. Other methods have also arisen to overcome some of the drawbacks of the dynamometer card. These methods include either updates or modifications of the conventional dynamometer card, or other methods not related to the dynamometer card. All of these methods, starting with the dynamometer card, are explained in this section.
Dynamometer card
Dynamometer is comprised of the word dynamo meaning power or force and meter which is a unit of length measurement. Therefore, the dynamometer card is a measurement of the load of the entire cycle of the sucker rod pump as a function of the position at which the force is measured. The dynamometer card is a plot of the load and displacement at each time step during a stroke as a function of the plunger load (Palka and Czyz 2009; Tommaso and Marfella 2018; Peng et al. 2019; Ferrigno et al. 2018; Chen et al. 2018). An example of a conventional dynamometer card is shown in Fig. 9. The load on both the traveling valve and the standing valve can be determined as a function of position.
When generated, there are usually two dynamometer cards including the surface and the downhole. The surface card is plotted relative to the surface readings, whereas the downhole dynamometer card is plotted relative to downhole conditions. Figure 10 shows the difference between both. Most of the operators rely on the downhole card due to its higher accuracy in depicting real case conditions. The main drawbacks in the downhole card however are data delay, noise inaccuracy, and inaccurate readings (Palka and Czyz 2009).
Based on the readings of the downhole and surface dynamometer cards, several conventional charts have been found to be very similar regardless of the reservoir and wellbore being studied. A summary of these dynamometer charts and their equivalent description is shown in Table 1.
Other methods
Although the dynamometer card is the main method used for bucker rod diagnostics, it has some drawbacks which led to the rise of other methods for beam rod pump diagnostics. These methods include modification to the dynamometer card, and other methods not reliant on the dynamometer card. A description of these methods is provided in Table 2.
Beam rod pump mathematical models
Modeling of the behavior and properties of the beam rod pump can be done using different equations. The main equation used to model beam rod pump is the wave equation. Since this equation is a partial differential equation, several solutions to this model have arisen based on the initial and boundary conditions and assumptions used to solve the wave equation. Other mathematical equations not reliant on the wave equation also exist. The main mathematical equations used to model the beam rod pump behavior and properties are summarized in Table 3. The equation, terminology description, and usage are mentioned for each model.
Beam rod pump common failures and mitigation
The main failures of the beam rod pump can be categorized into three main segments including mechanical, operational, and electrical failures. With each segment, several factors can contribute to the failure of the beam rod pump. The main failure mechanisms for the beam rod pump are summarized in Fig. 11. A detailed description of each segment and its sub-categories will be explained.
Mechanical failures
The main mechanical failures discussed in this research that occur with the beam pumping unit include tubing failure, friction, rod wear, pin and coupling wear, surface component failure, and pump failure.
Tubing failure and friction
During production, the downhole string of the sucker rod may sometimes collide with the tubing string. This friction may result in erosion and wear of both the tubing and the sucker rods. This could eventually lead to severe leakages and breakage of both components. Figure 12 shows an example of an eroded tubing pipe due to friction. To reduce collision between both the sucker rods and the tubing, several components could be added to the downhole assembly. The main component that can be used is centralizers. Also, proper design of the sucker rod string can reduce the collision significantly (Langbauer et al. 2021).
Rod wear
The sucker rods may also wear down due to several reasons. Firstly, the rods will wear down eventually due to their continuous motion up and down. This can be reduced by using durable material and proper design. The second reason for rod wear can be due to friction with the tubing, as was explained above. Finally, fluid pound can also reduce the life of the overall downhole components of the beam rod pump greatly (Dave et al. 2017). Figure 13 shows an example of fluid pound and rod wear that led to string breakage.
Since the rod string is composed of several components, failure in one of the components may lead to leakage in the string or failure of the entire string. One of components that are prone to failure due to wear and tear is the rod guide, shown in Fig. 14. Avoidance of this failure is mostly related to proper operations and accurate selection of material (Dove et al. 2016).
Pin and coupling wear
Pins and couplings are what connect the downhole components together and maintain the integrity of the downhole assembly. Wear in these components can lead to severe leakages, failure of some of the other major components, and loss of components in the hole due to string breakage. Figure 15 shows an example of a worn-down plunger surface valve and a ball seat valve. Proper operational and design procedures can reduce the risk of pin and coupling wear (Langbauer et al. 2020).
Surface components and pump
The surface components of the beam rod pump can wear down due to two main reasons. Firstly, long operations without proper maintenance can lead to efficiency decrease and eventually failure of some of the surface components. To avoid this maintenance of the components and continuous lubrication of the moving surface parts should be done. The second reason for surface component failure is environmental hazards, and man-made errors. The environmental hazards’ impact can be reduced by prediction of weather patterns and being prepared for changes in weather. Man-made errors can be avoided by proper training of the handling and maintenance personnel.
The pump can fail due to mechanical failure of some of its moving or stationary components. If this occurs, operations will be impacted significantly and may cease in the case of complete pump failure. To avoid this, proper pump design should be conducted including proper selection of pump size and material. The most commonly used materials for the sucker rod pumps include (Pino et al. 2020):
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Stainless steel (A1) for balls and seats, both of which are heat treated to provide hardness.
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Cobalt alloy (B1) for ball and seats made from hard cobalt, chromium, and tungsten alloy. They are highly resistant to corrosion and abrasion, non-magnetic.
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Tungsten carbide (C1) is an extremely hard composite of tungsten alloy and cobalt. It is used in the most severe corrosion and abrasion applications.
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Titanium carbide (C2) is much harder and tougher than cobalt alloy. Recommended for extreme corrosion and abrasion.
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Ceramic made of partially stabilized zirconia. Highly resistant to corrosion, abrasion, fluid cutting, and impact, and it is non-magnetic.
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Silicon nitride is highly resistant to corrosion, abrasion, fluid cutting, and impact and it is non-magnetic.
A summary of all the mechanical failures discussed along with a brief description of each failure is included in Table 4.
Operational failures
Operational failures are extremely common in beam rod pumping units. The operational failures discussed in this review include temperature failures, gas problems, corrosion failures, sand and erosion problems, and pressure differential problems.
Temperature failures
High downhole temperatures can lead to rapid material degradation and failure. This kind of failure is not a major concern with beam rod pumps however since most of the operations for this artificial lift method does not occur in very deep wells. Although beam rod pumps can be operated in viscous and reservoirs with a moderate sand and gas production, it is usually applied in moderate to shallow wells which usually do not suffer high temperatures. If temperature becomes an issue however, temperature resistant material can be a good method to avoid operational problems.
Gas problems
Although beam rod pumps can handle a considerable volume of gas without pump damage, a high volume of gas can reduce the overall efficiency of the pump by up to 40%. This reduction in efficiency is mainly due to late opening of the traveling valve in the down stroke due to compression of gas beneath the plunger.
One of the ways to handle gas production with sucker rod pumps is to place the intake beneath the producing zone. This allows the tubing-casing annulus to act as a separator and since the gas has a lower density, it will rise to the top. The intake, being beneath the production zone, will be submerged in the higher density liquid, and thus a minimum gas volume will be present in the pump. In horizontal wells, the pump cannot be placed below the producing zone, and thus a downhole gas separator is needed. At the intake of the separator, an annulus is created between the dip tube and the mud anchor body. This allows the heavier liquids to move down the dip tube while the lighter gas bubbles rise out of the separator (Allison et al. 2018). Figure 16 presents an illustration of a conventional downhole gas separator.
The two main types of gas separators include the centrifugal separator and the gravity separator. The centrifugal separator is based on centrifugal principle. It uses the difference in density of the water and oil and the difference in centrifugal force in the cyclone generated. Centrifugal separators usually the preferred method due to its speed however its efficiency is lower in wells that contain gas. The gravity separator relies on gravity separation based on density difference. This method is slower than the cyclone and has less efficiency (Jiang et al. 2020). Figure 17 presents an illustration of both types of separators.
Corrosion failures
Corrosion can result in material failure and operational hindrance and cessation. Corrosion occurs due to several factors including metal incompatibility in the presence of an electrolyte, and presence of corrosive fluids such as high total dissolved salts brine, carbon dioxide, and hydrogen sulfide. Figure 18 presents an image of the damage that corrosion can cause to the downhole components of the beam rod pump. In order to avoid corrosion problems, proper selection of material should be used. This includes metal compatibility, corrosion resistant material, and metal substitutes when needed. Early detection of corrosion can also be vital in reducing the overall impact of the corrosive fluid (Zhang et al. 2020).
Erosion/sand problems
An excessive volume of sand can lead to two problems. Firstly, it can cause severe erosion of the sucker rods and the pump which may eventually lead to failures. Secondly, it can accumulate in some of the components such as the plunger, as shown in Fig. 19. This can cause plugging problems that are very difficult to mitigate. The three main methods by which sand production in sucker rod can be mitigated include (Langbauer et al. 2020):
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Cope with the sand production by altering the production equipment to withstand sand.
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Stabilize the formation producing sand using chemicals.
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Install gravel pack, sand screen, and downhole desanders.
Pressure differential problems
Beam rod pumps are designed to handle some pressure differentials, however a sudden change in pressure can lead to abnormal operations and thus problems. The main problem that can occur is buckling of the string especially during the downstroke. This can lead to severe collision with the tubing string, and eventually string and tubing wear and failure (Langbauer et al. 2021). Figure 20 provides an illustration of string buckling and collision with tubing.
Table 5 provides a brief summary of all the operation failures discussed in this review along with a description of each failure.
Electrical failures
Electrical failures are less severe compared to mechanical and operational failures in the beam rod pumping unit. This is mainly due to the limited areas where electrical failures may occur in the beam pump. Electrical failures can result in the surface unit or in the downhole pump. For electrical failures in the surface unit, remediation is simple and rapid due to the ease of access, and also due to the fact that beam rod pumps are well known technologies. The main downhole component that can fail is the pump. If the pump fails, string retrieval will be necessary in order to determine the failure and to mitigate it. Other components that can fail downhole due to electrical failures include sensors, and electrical gauges (Palka and Czyz 2008). Table 6 provides a summary of the main electrical failure in the beam rod pump and their description.
Advancements in beam rod pumps
Several advancements have been made to improve on the performance and durability of the beam rod pump. These advancements were made based on special needs, however, they managed to introduce paramount technological changes to the beam rod pump which increased its applicability range and improved its mean time between failure (Lui et al. 2007). Table 7 provides a summary of the main advancements for the beam rod pump.
Beam rod pumps case studies
As mentioned earlier, beam rod pumps are the most applied sucker rod methods worldwide. For this reason, thousands of case studies are present for the beam rod pump. This review includes some of the most prominent field cases for the beam rod pump which encountered a significant event or showed use of a new technology or outcome. Case studies were selected from different countries worldwide to cover a large span of beam rod pump usage. These case studies are summarized in Table 8.
Beam rod pump advantages and limitations
Beam rod pumps have several advantages and limitations that must be taken into consideration when choosing a suitable artificial lift method. These advantages and limitations are mentioned in this section.
The main advantages of the beam rod pump system include:
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Cheap, mechanically established, and easy to operate by engineers, technicians and company personnel
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Can operate under a very wide or applicably conditions including harsh conditions with heavy oil and sand
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Many of the components are placed on the surface which makes it easy to fix and replace components
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Can operate in gassy wells if gas venting is taken into consideration
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Can be applied in deviated and horizontal wells using the correct components and the proper assembly
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Has more than three different types which increases the range of choices and also applicably range
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Is one of the most widely used artificial lift method which reflects availability and component replacement ease
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Pump monitoring can be easily done using surface and downhole dynamometer cards
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Its equations and fundamental mathematical models are well established
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Can be easily modeled using many software that is readily available
Although the beam rod pumps have many advantages, there are also some key limitations for this type of sucker rod pump which include:
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Surface components may sometimes require large surface areas which may not be available
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Is not applied extensively in offshore reservoirs due to surface components size
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Is prone to gas lock and corrosion problems due to the conditions at which it is applied
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Excessive sand production can cause failure
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Sucker rods are prone to failure to fluid leaks through it
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Dynamometer cards do not always yield accurate results and are usually not real time
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Crooked hole application can be problematic which require the use of reamers
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The stuffed box on the surface can leak which results in environmental hazards. Polished rod failure and fitting tees failure can also result, or lead to, stuffing box failures.
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Can utilize excessive energy due to large number of losses in the surface and downhole components
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Retrieval and fixing of downhole components may require surface service unit
Advantages and limitation of current study
This research aims to provide a roadmap to sucker rod pumps’ properties, diagnostics, modeling and recent innovations. The main advantages of this research are:
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Provides an up to date holistic review of the different types of sucker rod pumps.
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Gives a detailed explanation of beam rod pump diagnostics, modeling, and mathematical equations.
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Shows some of the main locations where sucker rod pumps have been applied and the main developments and innovations for each study.
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Highlights the main advantages and limitations of sucker rod pumps based on an updated database.
Although this research has several advantages, the main limitation of this research is access to data. Most of the field data in the oil and gas industry is considered classified and thus is unpublished. Also, most of this review is focused on the beam rod pump, which is the most common type of sucker rod pumps, since covering all the different types of sucker rod pumps in a comprehensive manner is beyond the scope of one manuscript.
Summary and conclusions
This research performs a detailed review of the beam rod pump and its applications, diagnostics, mathematical models, case studies, failure mechanisms and mitigation, and finally advantages and limitations. The main findings from this research are as follows:
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A new classification of sucker rod pump has been developed based on the novel technologies that fall under this artificial lift method.
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Beam rod pumps diagnostics can be done using dynamometer cards, however several other methods have been introduced that could rival the dynamometer card in the future.
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Mathematical modeling of the beam rod pump relies on solutions to the wave equation. Since it is a partial differential equation, different solutions arise based on initial and boundary conditions defined in the solution.
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Although the beam rod pump is a well-established artificial lift method, several technological advancements have been made to improve its applicability and extend its mean time between failure significantly.
Abbreviations
- a 2 :
-
Velocity force propagation
- v :
-
Damping factor
- u(x, t):
-
Displacement of the sucker rod at arbitrary depth and time
- L :
-
Length of the sucker rod string
- PPRL:
-
Peak polished rod load
- MPRL:
-
Minimum polished rod load
- W f :
-
Weight of the fluid column
- W r :
-
Weight of the rods in air
- A :
-
Area
- C D :
-
Viscous damping coefficient
- A r :
-
Cross-sectional area of the rod
- A and B :
-
Constants empirically derived
- S F :
-
Represents environmental effects; Service Factor
- S a :
-
Fatigue endurance limit
- S min :
-
Minimum rod stress
- T :
-
Minimum tensile strength of the rod material
- A i :
-
Metal area of the rod in the ith taper
- a i–d i :
-
Are best fitting line parameters
- L i :
-
Sucker rod length
- P inflow :
-
Inflow pressure
- P outflow :
-
Outflow pressure
- P wh :
-
Wellhead pressure
- E :
-
Young’s modulus
- g :
-
Gravitational constant
- t :
-
Time
- u :
-
Elongation
- \(\rho \) :
-
Density
- N :
-
Matrix that represents the wave equation
- I :
-
Unit matrix, also known as the filter matrix
- W :
-
Newly obtained set of data with the least global error
- f r :
-
Fluid velocity
- F rf :
-
Viscous force per unit length of rod
- F cf :
-
Viscous force per rod coupling per unit length of rod
- F rt :
-
Friction force between tubing and rod per unit length of rod
- F C ,API :
-
Equals unity for a uniform rod taper
- U, G, H :
-
Column vectors defined based on initial and boundary conditions
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The authors wish to thank The American University in Cairo for supporting this research through their research grant (AUC-RSG2-2020).
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Funding for this research was provided by The American University in Cairo through their research grant (AUC-RSG2-2020).
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Fakher, S., Khlaifat, A., Hossain, M.E. et al. A comprehensive review of sucker rod pumps’ components, diagnostics, mathematical models, and common failures and mitigations. J Petrol Explor Prod Technol 11, 3815–3839 (2021). https://doi.org/10.1007/s13202-021-01270-7
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DOI: https://doi.org/10.1007/s13202-021-01270-7