Electric pump production tubular column system and implementation method thereof

Abstract

The invention relates to an electric pump production pipe column system and an implementation method thereof. The oil pipe column is arranged in the sleeve and is used for conveying formation production liquid; the electric pump cable system is arranged in the oil pipe column and used for lifting formation produced fluid in the oil pipe column; the hydraulic control pipeline is used for controlling opening and closing of the oil pipe column and controlling anchoring of the electric pump cable system and the oil pipe column. The oil pipe column system and the electric pump cable system are installed separately, when the electric pump system is overhauled, only the electric pump cable system needs to be lifted out of a shaft, the oil pipe column system does not need to be lifted out of the shaft, the operation efficiency of electric pump system overhauling is improved, meanwhile, other pipelines do not need to be arranged in the cable, and the cost is reduced. Only the electric energy required by the electric pump system needs to be transmitted, thereby greatly facilitating the processing, production and installation of the cable, and further improving the production and operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, specifically to an electric pump production tubing system and its implementation method. Background Technology

[0002] The most common oilfield production method in offshore oilfields is electric pump lift (EPL). EPL systems typically use tubing run into the wellbore as the production channel. When performing maintenance on the EPL system, the tubing string connected to the EPL system needs to be pulled out of the wellbore, a complex and time-consuming process. The wireline-deployed EPL system technology arose to address this. This technology allows maintenance of the EPL system simply by pulling it out of the wellbore using the wireline, eliminating the need for the complex operation of running the tubing string. However, current wireline-deployed EPL systems either use downhole cable connections to complete the system's setup or require the wireline to integrate both cable and hydraulic control lines.

[0003] The electric pump production system using the current drop-and-retrieve method has the following main problems: (1) The wire drop-and-retrieve method requires the connection of the downhole cable head, which has a low success rate and high risk; (2) The specially made wire needs to integrate the cable and hydraulic control pipeline at the same time, which is complex to manufacture and has a high cost. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide an electric pump production tubing system and its implementation method, which separates the tubing system from the electric pump cable system. During maintenance of the electric pump system, only the electric pump cable system needs to be removed from the wellbore, without needing to remove the tubing system, thus improving the efficiency of electric pump system maintenance. Furthermore, the cable of this invention does not require any other internal pipelines; it only needs to transmit the electrical energy required by the electric pump system, greatly facilitating cable processing, production, and installation, further improving production and operational efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The electric pump production tubing system of the present invention includes: a casing; a tubing string disposed within the casing for transporting formation production fluid; an electric pump cable system disposed within the tubing string for lifting the formation production fluid within the tubing string; and a hydraulic control line for controlling the opening and closing of the tubing string and controlling the anchoring of the electric pump cable system to the tubing string.

[0006] Preferably, the electric pump production tubing system comprises tubing, a sealing cylinder, a downhole safety valve, a production packer, and a sliding sleeve; the sealing cylinder, the downhole safety valve, the production packer, and the sliding sleeve are connected in series through several sections of tubing to form the entire tubing string; the production packer is used to seal the annulus between the lower end of the tubing and the casing to prevent formation fluid from flowing into the annulus.

[0007] Preferably, the electric pump production tubing system includes an electric pump cable system comprising a cable, a cable connector, a hydraulic anchor, an insertion seal, and an electric pump system; the electric pump system is connected to the lower end of the cable for lifting formation fluid; the lower end of the insertion seal is connected to the electric pump system; the lower part of the hydraulic anchor is connected to the upper end of the insertion seal; the cable connector is disposed on the cable, and the cable connector and the top of the hydraulic anchor form a fluid outlet channel.

[0008] Preferably, in the electric pump production tubing system, the hydraulic anchor includes a hydraulic anchor body and a hydraulic anchor pad, wherein the hydraulic anchor pad is disposed on the side wall of the hydraulic anchor body for securing the oil pipe.

[0009] Preferably, in the electric pump production tubing system, the hydraulic anchor is provided with a hydraulic anchor hydraulic channel; the insertion seal is provided with a vertical insertion seal hydraulic channel and a horizontal sealing cylinder joint liquid passage; the lower end of the hydraulic anchor hydraulic channel is connected to the upper end of the insertion seal hydraulic channel, the lower end of the insertion seal hydraulic channel is connected to the first end of the sealing cylinder joint liquid passage, and the second end of the sealing cylinder joint liquid passage is connected to the sealing cylinder through the sealing cylinder joint.

[0010] Preferably, in the electric pump production tubing system, the hydraulic control line includes a downhole safety valve hydraulic control line and a hydraulic anchor hydraulic control line; the downhole safety valve hydraulic control line is connected to the downhole safety valve and is used to control the opening and closing of the downhole safety valve; the hydraulic anchor hydraulic control line is connected to the sealing cylinder joint and communicates with the liquid passage of the sealing cylinder joint, and is used to introduce pressurized fluid into the liquid passage of the sealing cylinder joint.

[0011] Preferably, the electric pump production tubing system further includes an upper sealing module and a lower sealing module for the insertion seal; the upper sealing module and the lower sealing module are respectively disposed between the sealing cylinder and the insertion seal, and are located above and below the liquid passage of the sealing cylinder joint, respectively, to form a seal between the sealing cylinder and the insertion seal to prevent pressurized fluid from entering the annulus between them.

[0012] Preferably, in the electric pump production tubing system, the insertion seal is provided with an insertion seal positioning step so that when the electric pump cable system is lowered, the insertion seal positioning step abuts against the sealing cylinder to achieve positioning.

[0013] The present invention also provides a method for implementing an electric pump production tubing system, comprising the following steps: During installation, the tubing string, along with the downhole safety valve hydraulic control line and the hydraulic anchor hydraulic control line, is lowered into the casing. The hydraulic anchor hydraulic control line is connected to and sealed with the sealing cylinder joint. Then, the production packer is set in the set position, and the sliding sleeve is in the open position. Next, the electric pump cable system is lowered into place. When the insertion seal positioning step of the insertion seal is located at the upper position of the sealing cylinder, the electric pump cable system is also lowered into place. The upper sealing module and the lower sealing module of the insertion seal are exactly at the upper and lower positions of the fluid passage of the sealing cylinder joint, forming a seal with the inside of the sealing cylinder. Hydraulic pressure is applied through the hydraulic anchor hydraulic control line. The fluid flows through the fluid passage of the sealing cylinder joint, the hydraulic passage of the insertion seal, and the hydraulic passage of the hydraulic anchor, causing the hydraulic anchor pads to open and anchor to the inner wall of the tubing, fixing the electric pump cable system and preventing the electric pump cable system from moving up and down during production, which could cause failure. During normal production, the formation fluid enters the tubing string through the sliding sleeve and is lifted by the electric pump system. The fluid flows through the outlet channels on the insertion seal, hydraulic anchor, and cable joint, enters the upper part of the tubing string, and is finally lifted to the surface. When the electric pump system needs maintenance, raise the cable until the electric pump cable system is pulled out of the wellbore and the maintenance is completed. After maintenance, lower the electric pump cable system back into the tubing string through the cable and into place. When the tubing string needs to be pulled out, release the pressure previously applied in the hydraulic anchor through the hydraulic anchor control line. The hydraulic anchor pads will retract. Follow the operation procedure to raise the tubing string until it is completely pulled out of the wellbore.

[0014] The present invention has the following advantages due to the adoption of the above technical solutions: (1) The present invention uses cables to operate the pump system, which greatly improves efficiency and avoids the risk of underground cable connection. (2) The cable used in this invention only requires the integration of cable cores, and does not require the integration of hydraulic control lines or other pipelines, thereby improving the production efficiency and reliability of the cable and making the operation more convenient. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a schematic diagram of the electric pump production tubing system described in this invention; Figure 2 yes Figure 1 A partial structural diagram.

[0016] The labels for the attached figures are as follows: 1-Casing; 2-Tubing; 3-Sealing cylinder; 3-1-Sealing cylinder joint; 3-2-Sealing cylinder joint fluid passage; 4-Downhole safety valve; 5-Production packer; 6-Sliding sleeve; 7-Downhole safety valve hydraulic control line; 8-Hydraulic anchor hydraulic control line; 9-Cable; 10-Cable joint; 10-1-Fluid outlet passage; 11-Hydraulic anchor; 11-1-Hydraulic anchor body; 11-2-Hydraulic anchor pad; 11-3-Hydraulic anchor hydraulic passage; 12-Insert seal; 12-1-Insert seal positioning step; 12-2-Insert seal upper sealing module; 12-3-Insert seal lower sealing module; 12-4-Insert seal hydraulic passage; 13-Electric pump system. Detailed Implementation

[0017] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0018] This invention provides an electric pump production tubing system and its implementation method. By installing the tubing system and the electric pump cable system separately, during maintenance of the electric pump system, only the electric pump cable system needs to be removed from the wellbore without removing the tubing system, thus improving the efficiency of electric pump system maintenance. At the same time, this cable does not require any other pipelines to be built in; it only needs to transmit the electrical energy required by the electric pump system, which greatly facilitates the processing, production, and installation of the cable, further improving production and operational efficiency.

[0019] like Figure 1 and Figure 2 As shown, the electric pump production tubing system of the present invention includes: a casing 1; a tubing string disposed within the casing 1 for transporting formation production fluid; an electric pump cable system disposed within the tubing string for lifting the formation production fluid within the tubing string; and a hydraulic control line for controlling the opening and closing of the tubing string and controlling the anchoring of the electric pump cable system to the tubing string.

[0020] In the above embodiments, preferably, the tubing string includes tubing 2, sealing cylinder 3, downhole safety valve 4, production packer 5, and sliding sleeve 6; sealing cylinder 3, downhole safety valve 4, production packer 5, and sliding sleeve 6 are connected in series through several sections of tubing 2 to form an integral tubing string; the production packer 5 is used to seal the annulus between the lower end of tubing 2 and casing 1 to prevent formation fluid from flowing into its annulus.

[0021] In the above embodiments, preferably, the electric pump cable system includes a cable 9, a cable connector 10, a hydraulic anchor 11, an insertion seal 12, and an electric pump system 13; the electric pump system 13 is connected to the lower end of the cable 9 for lifting formation fluid; the lower end of the insertion seal 12 is connected to the electric pump system 13; the lower part of the hydraulic anchor 11 is connected to the upper end of the insertion seal 12; the cable connector 10 is disposed on the cable 9, and the cable connector 10 and the top of the hydraulic anchor 11 form a fluid outlet channel 10-1.

[0022] In the above embodiments, preferably, as follows: Figure 2 As shown, the hydraulic anchor 11 includes a hydraulic anchor body 11-1 and a hydraulic anchor pad 11-2. The hydraulic anchor pad 11-2 is disposed on the side wall of the hydraulic anchor body 11-1 and is used to secure the slip oil pipe 2.

[0023] In the above embodiments, preferably, the hydraulic anchor 11 is provided with a hydraulic anchor hydraulic channel 11-3; the insertion seal 12 is provided with a vertical insertion seal hydraulic channel 12-4 and a horizontal sealing cylinder joint liquid passage 3-2; the lower end of the hydraulic anchor hydraulic channel 11-3 is connected to the upper end of the insertion seal hydraulic channel 12-4, the lower end of the insertion seal hydraulic channel 12-4 is connected to the first end of the sealing cylinder joint liquid passage 3-2, and the second end of the sealing cylinder joint liquid passage 3-2 is connected to the sealing cylinder 3 through the sealing cylinder joint 3-1.

[0024] In the above embodiments, preferably, the hydraulic control pipeline includes a downhole safety valve hydraulic control pipeline 7 and a hydraulic anchor hydraulic control pipeline 8; the downhole safety valve hydraulic control pipeline 7 is connected to the downhole safety valve 4 and is used to control the opening and closing of the downhole safety valve 4; the hydraulic anchor hydraulic control pipeline 8 is connected to the sealing cylinder joint 3-1 and communicates with the sealing cylinder joint liquid passage 3-2, and is used to introduce pressurized fluid into the sealing cylinder joint liquid passage 3-2.

[0025] In the above embodiments, preferably, the present invention further includes an upper sealing module 12-2 and a lower sealing module 12-3 for inserting the seal; the upper sealing module 12-2 and the lower sealing module 12-3 are respectively disposed between the sealing cylinder 3 and the insert seal 12, and are respectively located above and below the liquid passage 3-2 of the sealing cylinder joint, for forming a seal between the sealing cylinder 3 and the insert seal 12 to prevent pressurized fluid from entering the annulus between them.

[0026] In the above embodiment, preferably, the insertion seal 12 is provided with an insertion seal positioning step 12-1 so that when the discharge pump cable system is installed, the insertion seal positioning step 12-1 abuts against the sealing cylinder 3 to achieve positioning.

[0027] The implementation method of the electric pump production tubing system of the present invention includes the following steps: (1) During installation, the tubing string, along with the downhole safety valve hydraulic control line 7 and the hydraulic anchor control line 8, is lowered into the casing 1. The hydraulic anchor control line 8 is connected to and sealed with the sealing cylinder joint 3-1. Then, the production packer 5 is set and the sliding sleeve 6 is opened. The electric pump cable system is then lowered into the system. When the insertion sealing positioning step 12-1 of the insertion seal 12 is positioned on the upper part of the sealing cylinder 3, the electric pump cable system is also lowered into place. The upper sealing module 12-2 of the insertion seal and the insertion sealing... The lower sealing module 12-3 is positioned at the upper and lower parts of the liquid passage 3-2 of the sealing cylinder joint, forming a seal with the inside of the sealing cylinder 3. Hydraulic pressure is applied through the hydraulic anchor control pipeline 8, and the liquid flows through the liquid passage 3-2 of the sealing cylinder joint, the hydraulic channel 12-4 of the insertion seal, and the hydraulic channel 11-3 of the hydraulic anchor. This causes the hydraulic anchor tile 11-2 of the hydraulic anchor to open and anchor to the inner wall of the oil pipe 2, fixing the electric pump cable system and preventing the electric pump cable system from moving up and down during production, which could cause failure. (2) During normal production, the formation produced fluid enters the tubing string through the sliding sleeve 6 and is lifted by the electric pump system. The produced fluid flows through the outlet channel 10-1 on the insertion seal 12, hydraulic anchor 11, and cable joint 10, enters the upper part of the tubing string, and is finally lifted to the ground. (3) When the electric pump system needs to be repaired, lift the cable 9 until the electric pump cable system is pulled out of the wellbore and the repair is completed. After the repair is completed, lower the electric pump cable system back into the tubing string through the cable 9 and put it into place. When the tubing string needs to be pulled out, release the pressure previously applied in the hydraulic anchor through the hydraulic anchor control line 8. The hydraulic anchor pads 11-2 will retract. Lift the tubing string according to the operation procedure until it is completely pulled out of the wellbore.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric pump production tubing system, characterized in that, include: casing; A tubing string, installed inside the casing, is used to transport formation production fluids; An electric pump cable system is installed inside the tubing string and is used to lift the formation fluid inside the tubing string; The hydraulic control line is used to control the opening and closing of the tubing string and to control the anchoring of the electric pump cable system to the tubing string.

2. The electric pump production tubing system according to claim 1, characterized in that, The tubing string includes tubing, sealing sleeve, downhole safety valve, production packer, and sliding sleeve; The sealing cylinder, the downhole safety valve, the production packer, and the sliding sleeve are connected in series through several sections of tubing to form the tubing string as a whole; The production packer is used to seal the annulus between the lower end of the tubing and the casing to prevent formation production fluid from flowing into the annulus.

3. The electric pump production tubing system according to claim 2, characterized in that, The electric pump cable system includes a cable, a cable connector, a hydraulic anchor, an insertion seal, and an electric pump system. The electric pump system is connected to the lower end of the cable and is used to lift the formation fluid. The lower end of the insertion seal is connected to the electric pump system; The lower part of the hydraulic anchor is connected to the upper end of the insertion seal; The cable connector is disposed on the cable, and the cable connector and the top of the hydraulic anchor form a liquid outlet channel.

4. The electric pump production tubing system according to claim 3, characterized in that, The hydraulic anchor includes a hydraulic anchor body and a hydraulic anchor pad. The hydraulic anchor pad is disposed on the side wall of the hydraulic anchor body and is used to secure the oil pipe.

5. The electric pump production tubing system according to claim 4, characterized in that, The hydraulic anchor is equipped with a hydraulic anchor hydraulic channel; The insertion seal is provided with a vertical hydraulic channel and a horizontal liquid passage for the sealing cylinder joint. The lower end of the hydraulic channel of the hydraulic anchor is connected to the upper end of the hydraulic channel of the insertion seal, the lower end of the hydraulic channel of the insertion seal is connected to the first end of the liquid passage of the sealing cylinder joint, and the second end of the liquid passage of the sealing cylinder joint is connected to the sealing cylinder through the sealing cylinder joint.

6. The electric pump production tubing system according to claim 5, characterized in that, The hydraulic control lines include downhole safety valve hydraulic control lines and hydraulic anchor hydraulic control lines; The downhole safety valve hydraulic control line is connected to the downhole safety valve and is used to control the opening and closing of the downhole safety valve; The hydraulic anchor fluid control pipeline is connected to the sealing cylinder joint and communicates with the liquid passage of the sealing cylinder joint, for introducing pressurized fluid into the liquid passage of the sealing cylinder joint.

7. The electric pump production tubing system according to claim 5, characterized in that, It also includes an upper sealing module for inserting the seal and a lower sealing module for inserting the seal; The upper sealing module and the lower sealing module of the insertion seal are respectively disposed between the sealing cylinder and the insertion seal, and are located above and below the liquid passage of the sealing cylinder joint, respectively, to form a seal between the sealing cylinder and the insertion seal to prevent pressurized fluid from entering the annulus between them.

8. The electric pump production tubing system according to claim 3, characterized in that, The insertion seal is provided with an insertion seal positioning step so that when the discharge pump cable system is installed, the insertion seal positioning step abuts against the sealing cylinder to achieve positioning.

9. A method for implementing the electric pump production tubing system based on any one of claims 1 to 8, characterized in that, Includes the following steps: During installation, the tubing string, along with the downhole safety valve hydraulic control line and the hydraulic anchor hydraulic control line, is lowered into the casing. The hydraulic anchor hydraulic control line is connected to and sealed with the sealing cylinder joint. Then, the production packer is set in the set position, and the sliding sleeve is in the open position. Next, the electric pump cable system is lowered into place. When the insertion seal positioning step of the insertion seal is located at the upper position of the sealing cylinder, the electric pump cable system is also lowered into place. The upper sealing module and the lower sealing module of the insertion seal are exactly at the upper and lower positions of the fluid passage of the sealing cylinder joint, forming a seal with the inside of the sealing cylinder. Hydraulic pressure is applied through the hydraulic anchor hydraulic control line. The fluid flows through the fluid passage of the sealing cylinder joint, the hydraulic passage of the insertion seal, and the hydraulic passage of the hydraulic anchor, causing the hydraulic anchor pads to open and anchor to the inner wall of the tubing, fixing the electric pump cable system and preventing the electric pump cable system from moving up and down during production, which could cause failure. During normal production, the formation fluid enters the tubing string through the sliding sleeve and is lifted by the electric pump system. The fluid flows through the outlet channels on the insertion seal, hydraulic anchor, and cable joint, enters the upper part of the tubing string, and is finally lifted to the surface. When the electric pump system needs maintenance, raise the cable until the electric pump cable system is pulled out of the wellbore and the maintenance is completed. After maintenance, lower the electric pump cable system back into the tubing string through the cable and into place. When the tubing string needs to be pulled out, release the pressure previously applied in the hydraulic anchor through the hydraulic anchor control line. The hydraulic anchor pads will retract. Follow the operation procedure to raise the tubing string until it is completely pulled out of the wellbore.

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