A fishing type electric submersible pump and method

Abstract

The application discloses a small-diameter fishing type electric submersible plunger pump oil extraction device and method, and belongs to the technical field of mechanical oil extraction. 1 The device comprises a fishing wire, a power assembly, a pump assembly and a sleeve, and can be applied to a rodless oil extraction and lifting device of a conventional 5 1 / 2" sleeve (an inner diameter of 124 mm), and can also be applied to a 3 / 2" small sleeve well (an inner diameter of 76 mm), thereby avoiding damage to power devices and sticking problems in a small-diameter sidetracked well, and causing frequent downhole accidents. In addition, the oil extraction method can lift crude oil in a sidetracked well, and when pump inspection is performed, the plunger pump only needs to be replaced through the fishing wire, without simultaneously lifting the pump and the motor unit, so that the cost and labor intensity of pump inspection are reduced, the operation time is greatly shortened, and downhole accidents are reduced.

Description

Technical Field

[0001] This invention belongs to the field of mechanical oil production technology, and relates to a drop-and-retrieve electric submersible plunger pump oil production device and method, especially a method suitable for sidetracking wells and 3D drilling. 1 / 2" Electric submersible plunger pump oil production device and method for rodless oil production lifting in small wells. Background Technology

[0002] As oilfield development enters its mid-to-late stages, well conditions become increasingly complex, and the number of wells with casing damage increases. To reduce production losses, sidetracking or running smaller casing is typically employed to improve well conditions. Currently, the rodless oil production lift system used in oilfields effectively solves problems such as pipe wear, breakage, and low lift efficiency in conventional oil wells.

[0003] However, the outer diameter of conventionally used units is typically between 98 and 114 mm, making them suitable only for 5... 1 / 2" casing (inner diameter 124mm). However, it cannot be used in sidetracking and 3" casing. 1 / 2" small-diameter wells (76mm inner diameter) are prone to damage to power components and stuck pipe issues in conventional rodless lifting pump and motor units, which are all driven by tubing in small-diameter side-drilling wells, leading to frequent downhole accidents. In addition, pump inspection operations require the simultaneous retrieval of the pump and motor unit, increasing the cost and labor intensity of pump inspection. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of damage to power components and stuck drill pipe caused by the pump and motor units in the rodless lift process of sidetracking tubing, as well as the problems of increased labor intensity and pump inspection costs when pulling out the pump and motor units during pump inspection operations. This invention provides a small-diameter, deployable electric submersible plunger pump oil production device and method suitable for rodless oil production lift in sidetracking wells and 3 1 / 2" small casing wells. It solves the problems of damage to power components caused by pulling out and running tubing during oil production lift in sidetracking wells and 3 1 / 2" small casing wells, high costs of pump inspection and replacement operations, and high frequency of downhole accidents.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] The present invention provides a drop-and-retrieve electric submersible plunger pump oil production device, including an oil pipe, a cable and a main casing. The side wall of the main casing is provided with a side hole, and a branch casing extends from the side hole at an angle greater than 0° with the main casing.

[0007] The oil pipe is located inside the main casing and extends into the branch casing;

[0008] The oil pipe is equipped with a retrieval wire.

[0009] The end of the fishing wire is connected in sequence to the plunger pump and the perforated pipe of the pump assembly;

[0010] The bottom end of the flower tube is sequentially connected to the motor protector and the motor of the power assembly;

[0011] The motor is connected to the cable via a cable connector.

[0012] Preferably, a locking ring is provided between the plunger pump and the perforated pipe.

[0013] Preferably, a lower locking ring is provided between the upper locking ring and the flower tube, and the upper locking ring and the lower locking ring are connected in cooperation.

[0014] Preferably, a sealing conical surface is provided between the upper and lower locking rings and the inner wall of the sleeve, which is used to isolate the oil pipe from the tube and fix the upper and lower locking rings.

[0015] Preferably, a plug-in connector is provided between the flower tube and the motor protector.

[0016] Preferably, the cable connector is a flat cable wet connector, including a housing, the cable is inserted into the housing, and a plug is connected to the end of the cable, the plug being connected to the motor head base of the motor.

[0017] Preferably, the material of the housing is stainless steel.

[0018] Preferably, the plug is provided with a first sealing pressure plate, a sealing gasket, a second sealing pressure plate, and a pressure ring sequentially from the end connected to the cable.

[0019] Preferably, the interior of the housing of the cable connector is sealed with sealant.

[0020] The oil extraction method using the above-mentioned electric submersible plunger pump oil extraction device includes the following steps:

[0021] S1: Use oil pipes to lower the power components, including the motor protector and motor, along with the cable, into the bushing;

[0022] S2: Use the retrieval wire to send the plunger pump and perforated pipe of the pump set into the oil pipe and connect them with the motor protector. After successful connection, the coupling of the pump set and the power component transmission system is completed, and the retrieval wire is lifted to complete the downhole installation of the retrieval-type electric submersible plunger pump.

[0023] S3: After the downhole installation of the drop-and-retrieve electric submersible plunger pump is completed, the surface power is turned on, and the power after frequency conversion of the surface control system is transmitted to the downhole motor through the cable. The motor drives the plunger pump to move and start the lifting of crude oil in the side-drilled well until all the crude oil in the side-drilled well is lifted to the surface oil pipeline, and the crude oil lifting process in the side-drilled well ends.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention achieves side-drilling and 3D drilling through the rational arrangement of power components, pump assembly, casing cable, and casting / retrieval wire. 1 The rodless lift pump assembly and power assembly tubing delivery in 2" small-casing wells (76mm inner diameter), as well as crude oil lifting in sidetracked wells, avoids damage to power components and stuck pipe issues. The deployment of the retrieval wireline enables the retrieval of the pump assembly, reducing the labor intensity and cost of pump inspection and replacement operations. The casing installation skillfully meets the requirements for sidetracked well completion while maintaining long-term wellbore stability.

[0026] The oil production method using the above-mentioned electric submersible plunger pump oil production device can achieve side-drilling and 3D drilling. 1 This method utilizes a rodless lift process pump unit, motor unit, and tubing transfer in 2" small-casing wells (76mm inner diameter) for crude oil lifting in sidetracked wells. It is simple and easy to operate, effectively saving labor, shortening operation time, reducing pump inspection costs, and minimizing downhole accidents. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a diagram of the electric submersible plunger pump oil extraction device of the present invention.

[0029] Figure 2 This is a structural diagram of the cable connector of the present invention.

[0030] Figure 3 This is a structural diagram of the motor head base of the present invention.

[0031] Figure 4 This is a flowchart of the oil extraction method using an electric submersible plunger pump, as described in this invention.

[0032] Among them: 1-Fishing wire, 2-Oil pipe, 3-Main casing, 4-Branch casing, 5-Plunger pump, 6-Upper locking ring, 7-Lower locking ring, 8-Sealing cone surface, 9-Plug-in connector, 10-Swivel pipe, 11-Motor protector, 12-Motor, 121-Motor head base, 13-Cable, 14-Cable connector, 141-Housing, 142-Plug, 143-First sealing pressure plate, 144-Sealing gasket, 145-Second sealing pressure plate, 146-Pressure ring, 147-Pressure cap, 148-Potting structure. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0039] The present invention will now be described in further detail with reference to the accompanying drawings:

[0040] See Figure 1 The present invention provides a drop-and-retrieve type electric submersible plunger pump oil production device, including a drop-and-retrieve steel wire 1, an oil pipe 2, a main casing 3, a branch casing 4, a cable 13, a power component and a pump assembly; the power component includes a plug-in connector 9, a motor protector 11 and a motor 12, and the pump assembly includes a plunger pump 5, a perforated pipe 10, an upper locking ring 6 and a lower locking ring 7.

[0041] The oil pipe 2 is located inside the casing 4, and the retrieval wire 1 is located inside the oil pipe 2. The retrieval wire 1 is sequentially connected to the plunger pump 5, upper locking ring 6, lower locking ring 7, and perforated pipe 10 of the pump assembly. The upper locking ring 6 and lower locking ring 7 are connected in a mating manner. The plunger pump 5 is used to pump crude oil from the pump barrel into the oil pipe, which is then lifted to the surface oil pipeline for collection and transportation. A sealing conical surface 8 is provided between the upper locking ring 6 and the lower locking ring 7 and the inner wall of the oil pipe 2 to isolate the pump inlet perforated pipe 10 from the upper oil pipe and to fix the upper and lower locking rings. One end of the perforated pipe 10 is axially connected to the plug-in connector 9 to achieve coupling between the pump assembly and the power assembly transmission system. The other end of the plug connector 9 is connected in sequence to the motor protector 11, the cable connector 14 and the motor 12; the cable connector 14 is connected to one end of the cable 13, and the other end of the cable 13 is connected to the ground power supply. The cable 13 is a three-phase flat cable and is designed with two layers of double-layer fluoroplastic insulation to ensure good insulation.

[0042] The main sleeve 3 is 5 1 / 2" standard sleeve;

[0043] The sleeve 4 is 3 1 / 2" small casing, mainly used for repairing wells with casing damage, that is, requiring 5 1 / 2" conventional casing 3, which also meets the requirements for side-drilled well completion and maintains the long-term stability of the wellbore;

[0044] The oil pipe 2 is a 1.9" API standard oil pipe;

[0045] The motor protector 11 has a projected diameter of ≤66mm and is installed on the upper part of the motor. It is used to provide space for motor oil expansion, isolate well fluid, and achieve pressure balance.

[0046] See Figure 2 and Figure 3 The cable connector 14 is a flat cable wet connector, including a housing 141. The cable 13 is inserted into the housing 141, and the end of the cable 13 is connected to a plug 142. The plug 142 is connected to the motor head base 121 of the motor 12. The connection between the cable 13 and the motor 12 is completed by inserting the plug 142 into the motor head base 121 (DD direction).

[0047] The cable connector 14 is designed to ensure reliable sealing of the cable 13 within a very limited space, while also guaranteeing the insulation of the cable 13 and the overall mechanical strength of the cable connector 14. The housing 141 of the cable connector 14 uses a stainless steel armored cable 13. One end of the plug 142 connects to the cable 13. From the end connected to the cable 13, the plug 142 is sequentially fitted with a first sealing plate 143, a sealing gasket 144, a second sealing plate 145, and a pressure ring 146. The pressure ring 146 is threaded onto the cable connector 143. The cable connector 141 is connected to the housing 141. While the pressure ring 146 compresses the first sealing plate 143 and the second sealing plate 145, it also compresses the sealing gasket 144. The deformed sealing gasket 144 then holds the cable 13 and the plug 142, thus fixing the cable 13 to the plug 142 inside the cable connector 14. Then, epoxy A / B adhesive is mixed according to a specific ratio at the top and finally, the entire structure is insulated and sealed using a potting method. After the potting adhesive is injected into the potting structure 148, the upper end of the cable connector 14 is pressed down with a pressure cap 147, which is bolted to the housing 141. This ensures that the cable 13 and the cable connector 14 are assembled into a reliable whole, guaranteeing their strength.

[0048] See Figure 4 The oil extraction method using the above-mentioned drop-and-retrieve electric submersible plunger pump oil extraction device includes the following steps:

[0049] S1: Using oil pipe 2, the power assembly, including motor protector 11 and motor 12, along with cable 13, is lowered into the bushing 4. The specific operation is as follows:

[0050] Connect cable 13 to cable connector 14, then insert the plug 142 of cable connector 14 into the motor head base 121 of motor 12, connect cable 13 to motor 12, and connect the top of motor 12 to motor protector 11 and plug connector 9 in sequence. Use oil pipe 2 to lower cable 13 together with motor 12, motor protector 11 and plug connector 9 into the well.

[0051] S2: Using the retrieval wire 1, the plunger pump 5 and the perforated pipe 10 of the pump assembly are sent into the tubing 2 and connected to the motor protector 11. After successful connection, the coupling of the pump assembly and the power component transmission system is completed. The retrieval wire is then lifted to complete the downhole installation of the retrieval-type electric submersible plunger pump. The specific operation is as follows: The sealing cone 8 is set on the inner wall of the casing 4 according to the design position. In the 1.9" tubing 2, the pump assembly, including the plunger pump 5, upper locking ring 6, lower locking ring 7 and perforated pipe 10, is lowered into the wellbore according to the design position using the retrieval wire until the components reach their respective positions. The bottom end of the perforated pipe 10 is connected to the top end of the plug connector 9 on the motor protector to complete the coupling of the pump assembly and the power component transmission system. The retrieval wire 1 is then lifted and released to complete the downhole installation of the retrieval-type electric submersible plunger pump.

[0052] S3: After the downhole installation of the drop-and-retrieve electric submersible plunger pump is completed, the surface power is turned on, and the power after frequency conversion of the surface control system is transmitted to the downhole motor 12 via cable 13. The motor 12 drives the plunger pump 5 to move, starting the lifting of crude oil in the side-drilled well, until all the crude oil in the side-drilled well is lifted to the surface pipeline. The crude oil lifting process in the side-drilled well is then completed. The specific operation is as follows:

[0053] The surface power is activated, and the frequency-converted power from the surface control system is transmitted to the downhole motor 12 via cable 13. The motor 12 drives the plunger pump 5, and crude oil flows from the plunger pump 5 barrel into the 1.9" tubing 2, and is finally lifted to the surface, completing the lifting of the crude oil. At the same time, the signal cable in cable 13 can transmit key parameters such as the temperature and pressure of the downhole oil layer to the surface for actual parameter adjustment.

[0054] When performing pump inspection, if there is no electrical fault in the downhole power unit, it is not necessary to retrieve it. Simply use the retrieval wire 1 to replace the downhole pump assembly. This method of operation does not require the use of a workover rig, saving workover costs, shortening operation time, reducing labor intensity, and reducing the occurrence of downhole accidents.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A deployable electric submersible plunger pump oil extraction device, characterized in that, It includes an oil pipe (2), a cable (13) and a main casing (3). The side wall of the main casing (3) is provided with a side hole, and a sub-casing (4) extends from the side hole at an angle greater than 0° with the main casing (3). The oil pipe (2) is located inside the main casing (3) and extends into the branch casing (4); The oil pipe (2) is equipped with a retrieval wire (1); The end of the fishing wire (1) is connected in sequence to the plunger pump (5) and the perforated pipe (10) of the pump assembly; an upper locking ring (6) is provided between the plunger pump (5) and the perforated pipe (10); a lower locking ring (7) is provided between the upper locking ring (6) and the perforated pipe (10), and the upper locking ring (6) and the lower locking ring (7) are connected in cooperation; a sealing cone surface (8) is provided between the upper locking ring (6) and the lower locking ring (7) and the inner wall of the sleeve (4) to isolate the oil pipe (2) from the perforated pipe (10) and fix the upper locking ring (6) and the lower locking ring (7). The bottom end of the flower tube (10) is sequentially connected to the motor protector (11) and the motor (12) of the power assembly; a plug-in connector (9) is provided between the flower tube (10) and the motor protector (11). The motor (12) is connected to the cable (13) via a cable connector (14); The cable connector (14) is a flat cable wet connector, including a housing (141). The cable (13) is inserted into the housing (141). The end of the cable (13) is connected to a plug (142). The plug (142) is connected to the motor head base (121) of the motor (12). The plug (142) is fitted with a first sealing pressure plate (143), a sealing gasket (144), a second sealing pressure plate (145), and a pressure ring (146) in sequence from the end connected to the cable (13).

2. The deployable electric submersible plunger pump oil extraction device according to claim 1, characterized in that, The material of the housing (141) is stainless steel.

3. The deployable electric submersible plunger pump oil extraction device according to claim 1, characterized in that, The interior of the housing (141) of the cable connector (14) is sealed with sealant.

4. An oil production method using the electric submersible plunger pump oil production device according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Using the oil pipe (2), the power assembly containing the motor protector (11) and the motor (12) along with the cable (13) is lowered into the bushing (4); S2: Using the retrieval wire (1), the plunger pump (5) and the perforated pipe (10) of the pump group assembly are sent into the oil pipe (2) and connected to the motor protector (11). After successful connection, the coupling of the pump group assembly and the power component transmission system is completed, and the retrieval wire is lifted to complete the downhole installation of the retrieval-type electric submersible plunger pump. S3: After the downhole installation of the drop-able electric submersible plunger pump is completed, the surface power supply is started, and the power after frequency conversion of the surface control system is transmitted to the downhole motor (12) through the cable (13). The motor (12) drives the plunger pump (5) to move, and starts the lifting of crude oil in the side well until all the crude oil in the side well is lifted to the surface oil pipeline, and the crude oil lifting process in the side well ends.

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