Intelligent device downstream of a pump and method of use thereof

Abstract

The application provides a pump-down intelligent device and a use method thereof. The pump-down intelligent device comprises a top rod, a positioning ring, a motor, a central processing unit and a proximity sensor. The motor is connected with the lower end of the top rod. The top rod is connected with the positioning ring. The central processing unit is connected with the motor and the proximity sensor respectively. The central processing unit receives a control instruction sent by a ground control cabinet and controls the motor to drive the top rod to move upward and downward according to the control instruction. The proximity sensor collects position information of the positioning ring and transmits the position information to the central processing unit to confirm the position of the top rod. The pump-down intelligent device and the use method thereof can assist to realize the setting of the electric pump well oil production pipe column layered packer and can realize the oil discharge of the pump cylinder. The pump-down intelligent device can realize the pump-down parameter test and the oil sleeve annulus dynamic liquid level test and is a multifunctional and practical pump-down intelligent device.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to an intelligent device under a pump and its usage method. Background Technology

[0002] After the stratified production tubing is lowered into the well, the stratified packer needs to be set. The most common stratified packer uses hydraulic setting, requiring pressure to be applied into the tubing at the wellhead. However, the production pump is connected to the upper part of the tubing, and the valve ball on the fixed valve at its lower end sits on the valve seat, preventing hydraulic pressure from the wellhead from reaching the downhole stratified packer. To solve this problem, engineers developed a pump-down pushrod device. The pushrod pushes open the valve ball, allowing the packer to be hydraulically set. Then, hydraulic pressure breaks the shear pins, controlling the pushrod to fall, causing the valve ball to drop and enabling oil production. However, this device has limitations: it can only be used once and cannot be reused, and it cannot verify whether the valve ball has actually fallen into the valve seat.

[0003] Patent CN 103806886 B discloses a downhole steam control device and method for heavy oil thermal recovery wells. The device includes a thermal recovery packer positioned in the wellbore near the upper oil layer. A reverse switch is located at the bottom center of the packer, while the top is connected to a hydraulic valve device via a screen pipe. The hydraulic valve device is triggered and abuts against the reverse switch from center to bottom. The hydraulic valve device is connected to a fixed valve controller via an oil pipe, and the fixed valve controller is installed at the lower end of the pump. This invention effectively closes the switch after steam injection and allows the switch to be opened during the wellhead sealing process after steam injection, overcoming the defects and shortcomings of existing technologies.

[0004] Patent CN104196716B discloses a rod pump pressure relief tool, including a sleeve that mates with the rod pump, and a rotatable push rod inside the sleeve. The push rod is positioned directly opposite a valve ball inside the rod pump barrel. In use, the push rod is rotated until it pushes open the valve ball, allowing high-pressure gas or liquid inside the rod pump to escape. This rod pump pressure relief tool achieves simple, safe, and quick pressure relief by installing a push rod capable of opening the valve ball inside the rod pump.

[0005] Patent CN209622101U discloses a connection structure between the ball and stem of a ball valve, including a ball, an upper stem, and a lower stem. The upper end of the ball has a spline groove at its opening. The upper stem is connected to the lower stem via the spline groove. A blow-proof flange and a sealing ring are located in the middle of the upper stem. The sealing ring is positioned near the ball, and the blow-proof flange is positioned above the sealing ring. A stem head is located at the top of the upper stem. The lower stem is integrally welded to the ball, and a bearing is located at the lower end of the lower stem, rotatably connected to the bearing. This ball valve connection structure transmits torque to the bearing, reducing torsional stress. Simultaneously, the spline connection improves the sealing performance between the stem and the ball, making it worthy of promotion.

[0006] Patent CN209129841U discloses a valve ball support for an oil pump. The support includes a cylindrical support tube, which is composed of an upper connector and a lower connector. The upper end of the upper connector is a connection end for connecting to the pump barrel of the oil pump. A push rod is installed inside the support tube. The push rod has a support end that extends beyond the upper end of the support tube to support the valve ball, separating the valve ball from the valve seat. The push rod has a lower stop structure that engages with the lower connector to prevent the push rod from falling when the upper and lower connectors are connected. The push rod also has an upper stop structure that engages with the upper connector to prevent the push rod from separating from the upper connector when the upper and lower connectors are separated. This support is connected below a tubular oil pump. When a hydraulic packer is connected below, hydraulic pressure is applied from the tubing and the tubular oil pump to achieve packer setting. Compared with conventional hydraulically set bridge plug strings, this reduces one tubing string, saving operating costs.

[0007] Patent CN201706036U discloses a valve ball push rod device, specifically a valve ball position adjustment device for ball valves used in unclean media such as high viscosity, suspensions, and pulp. It includes a valve body, characterized by: welding a support base to the bottom of the valve body; screwing a push rod into the support base; threaded connection between the support base and the tini frame; inserting a stuffing box assembly into the stuffing box hole of the support base; securing the stuffing box assembly with a pressure cap; and screwing a top cover onto the outer end of the support base to cover the push rod.

[0008] The aforementioned comparative patents disclose various push rod devices, but all of them use mechanical means to realize the push rod action, which fails to solve the technical problem we want to solve. Therefore, we have invented a new intelligent device under the pump and its usage method. Summary of the Invention

[0009] The purpose of this invention is to provide a method that combines mechanical and electrical control to achieve multi-parameter testing and electromechanical control of pumps.

[0010] The objective of this invention can be achieved through the following technical measures: an intelligent device under the pump, comprising a push rod, a positioning ring, a motor, a central processing unit, and a proximity sensor. The motor is connected to the lower end of the push rod, and the positioning ring is connected to the push rod. The central processing unit is connected to both the motor and the proximity sensor. The central processing unit receives control commands sent from the ground control cabinet and controls the motor to drive the push rod to move upward and downward according to the control commands. The proximity sensor collects the position information of the positioning ring and transmits the position information to the central processing unit to confirm the position of the push rod.

[0011] The objective of this invention can also be achieved through the following technical measures:

[0012] The pump-mounted intelligent device also includes a body, which is a cylindrical rigid body. The central processing unit, the motor, the push rod, and the positioning ring are all located on the axis of the body and are coaxial with the body.

[0013] The upper end of the body is connected to the fixed valve under the pump via a thread, and the lower end of the body is connected to the lower oil pipe via a thread.

[0014] The body includes a flow channel that runs through the body from top to bottom.

[0015] The proximity sensor is fixed inside the upper end of the body, close to the outside of the top rod, and the proximity sensor corresponds to the positioning ring in the axial direction.

[0016] The pump-mounted intelligent device also includes an internal temperature and pressure sensor, which is fixed to the upper surface of the body and avoids the flow channel and the proximity sensor, and is used to test the temperature and pressure inside the oil pipe.

[0017] The intelligent device under the pump also includes an external temperature and pressure sensor located on the outer wall of the body, used to test the temperature and pressure outside the oil pipe.

[0018] The pressure value measured by the external pressure sensor is P1. According to the formula P1 = ρ

[0019] *g*h0; where ρ is the density of the oil-water mixture, g is the gravitational acceleration, and h0 is the submersion degree of the location of the intelligent device under the pump; therefore, h0=P1 / (ρ*g), and the pump submersion degree h2=h0-h1; where h1 is the distance between the pump and the intelligent device under the pump; the intelligent device under the pump can monitor and calculate the pump submersion degree h2 in real time.

[0020] The downhole intelligent device also includes a cable, through which the central processing unit is connected to the surface control device; the central processing unit is connected to other downhole electrical equipment through the output end of the cable.

[0021] The objective of this invention can also be achieved through the following technical measures: a method for using an intelligent device under the pump, the method of using the intelligent device under the pump comprising:

[0022] (1) The central processing unit reads the signal from the ground control cabinet and determines whether the signal instruction is a test or a control; if it is a test signal, proceed to step (3); if it is a control signal, proceed to step (2).

[0023] (2) Determine whether the command is a push rod extension command or a push rod retraction command; if it is a push rod extension command, proceed to step (4); if it is a push rod retraction command, proceed to step (5);

[0024] (3) The central processing unit reads the data from the proximity sensor, the internal temperature and pressure sensor and the external temperature and pressure sensor and sends it to the ground control cabinet; then returns to step (1);

[0025] (4) Read the proximity sensor signal and determine whether the push rod has been extended; if the push rod has been extended, proceed to step (6); if the push rod has not been extended, proceed to step (8);

[0026] (5) Read the proximity sensor signal and determine whether the push rod has been retracted; if the push rod has been retracted, proceed to step (7); if the push rod has not been retracted, proceed to step (9);

[0027] (6) The central processing unit sends a signal that the push rod has been extended to the ground control cabinet;

[0028] (7) Send a signal that the top rod has been retrieved to the ground control cabinet;

[0029] (8) The central processing unit drives the motor, and the push rod extends; return to step (4);

[0030] (9) Drive the motor and retract the push rod; return to step (5).

[0031] The objective of this invention can also be achieved through the following technical measures:

[0032] In step 8, the central processing unit receives the push rod extension command from the ground control cabinet, and sends a command to control the motor to move, and the push rod moves upward to push out; the valve ball is pushed open from the valve seat, and the crude oil in the pump barrel is discharged.

[0033] In step 9, the central processing unit receives the push rod retraction command from the ground control cabinet. The central processing unit sends a command to control the motor to move. The push rod moves downward under the drive of the motor, and the lower valve ball of the pump falls into the valve seat, and the pump starts to work normally.

[0034] The intelligent pump-down device and its usage method in this invention employ a combination of mechanical and electrical control to achieve the device's measurement and control functions. Powered via cable connection, it can share a single cable with the intelligent downhole production controller. It allows for control and confirmation of the push rod's movement position on the surface; real-time oil unloading from the pump barrel and real-time pressure testing of the packer inside the tubing; and testing of downhole parameters and the fluid level in the annulus. This multifunctional and highly practical intelligent pump-down device provides support for the application of intelligent stratified oil production technology in oilfields.

[0035] The advantages of this invention are: the device is powered via cable connection and can share a cable with the downhole intelligent production controller. Applying intelligent measurement and control technology to assisted electric pump oil production, the extension and retraction of the pump pushrod can be tested and controlled in real time. It can assist in the setting of the hydraulically controlled stratified packer in the production tubing of electric pump wells and enable oil drainage from the pump barrel. The downhole intelligent device can test the temperature and pressure inside and outside the tubing, with the external tubing pressure converting to pump submersion. It can perform downhole parameter testing and annular fluid level testing, making it a multifunctional and highly practical downhole intelligent device. Attached Figure Description

[0036] Figure 1 This is a structural diagram of a specific embodiment of the intelligent pump device of the present invention;

[0037] Figure 2 for Figure 1 The A_A view of the intelligent device under the pump is shown;

[0038] Figure 3 This is a schematic diagram of the central processing unit control logic of the intelligent device under the pump in a specific embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the oil production tubing structure in a specific embodiment of the present invention.

[0040] In the diagram: 1. Top rod; 2. Positioning ring; 3. Flow channel; 4. Motor; 5. Control line; 6. Central processing unit; 7. Proximity sensor; 8. Internal temperature and pressure sensor; 9. External temperature and pressure sensor; 10. Test line 1; 11. Test line 2; 12. Test line 3; 13. Cable input end; 14. Cable output end; 15. Body; 16. Circuit installation channel; 3-1. Ground control cabinet; 3-2. Cable; 3-3. Oil pipe; 3-4. Electric pump; 3-5. Intelligent device under pump; 3-6. Intelligent production dispenser 1; 3-7. Hydraulic control packer; 3-8. Intelligent production dispenser 2. Detailed Implementation

[0041] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0043] The intelligent downhole device of this invention includes a push rod, a positioning ring, a motor, a central processing unit (CPU), a proximity sensor, an internal temperature and pressure sensor, an external temperature and pressure sensor, a cable, and a main body. The main body is a cylindrical rigid body; the motor is connected to the lower end of the push rod, and the positioning ring is connected to the push rod; the CPU, motor, push rod, and positioning ring are all located on the axis of the main body and are coaxial with it; the upper end of the main body is connected to the downhole fixed valve via a thread; the lower end of the main body is connected to the lower tubing via a thread; a flow channel runs through the main body from top to bottom; the proximity sensor is fixed inside the upper end of the main body, close to the outer side of the push rod, and corresponds to the positioning ring in the axial direction; the internal temperature and pressure sensor is fixed on the upper surface of the main body, avoiding the flow channel and the proximity sensor, and is used to test the temperature and pressure inside the tubing; the external temperature and pressure sensor is located on the outer wall of the main body and is used to test the temperature and pressure outside the tubing. The CPU is connected to a surface control device via a cable input end; the CPU is connected to other downhole electrical equipment via a cable output end.

[0044] The intelligent pump-down device of this invention can achieve upward and downward movement of the push rod driven by an internal motor. Before being lowered into the well, the push rod pushes the valve ball at the bottom of the oil pump, achieving pressure connection throughout the entire production tubing string. After the tubing string is lowered into the well, pressure is applied at the wellhead to set the hydraulically controlled packer in the tubing string. After setting, the push rod moves downward under the drive of the motor, and the valve ball at the bottom of the oil pump falls into the ball seat, enabling normal oil production. The push rod has a positioning ring that works with the proximity sensor in the intelligent pump-down device to confirm the push rod's lowering position. Furthermore, the intelligent pump-down device is equipped with internal and external tubing pressure and temperature detection functions, enabling dynamic fluid level depth testing. The pump-down temperature and pressure parameter testing can be used for pump condition monitoring.

[0045] The following are several specific embodiments of the application of the present invention.

[0046] Example 1

[0047] In a specific embodiment 1 of the present invention, the intelligent device under the pump consists of electronic components, electronic circuits, and mechanical structures, such as... Figure 1 As shown.

[0048] The electronic components consist of five parts: a central processing unit 6, a motor 4, a proximity sensor 7, an internal temperature and pressure sensor 8, and an external temperature and pressure sensor 9.

[0049] The electronic circuitry includes six lines: control line 5, test line 10, test line 21, test line 32, cable input terminal 13, and cable output terminal 14.

[0050] The mechanical structure includes: push rod 1, positioning ring 2, flow channel 3, body 15, and circuit mounting channel 16; such as Figure 2 As shown, Figure 1 AA view. The flow channel 3 on the main body 15 is an axial through hole; the circuit mounting channel 16 is a blind hole, which houses electronic components such as circuit boards.

[0051] The connection relationships of the electronic components and electronic circuits are as follows: the central processing unit 6 is connected to the motor 4 through the control line 5; the central processing unit 6 is connected to the proximity sensor 7 through the test line 10; the central processing unit 6 is connected to the internal temperature and pressure sensor 8 through the test line 2 11; the central processing unit 6 is connected to the external temperature and pressure sensor 9 through the test line 3 12; the central processing unit 6 is connected to the ground control cabinet through the cable input terminal 13; and the central processing unit 6 is connected to other electrical equipment in the well through the cable output terminal 14.

[0052] Mechanical Connections and Positional Relationships: The main body 15 is a cylindrical rigid body; the motor 4 is connected to the lower end of the push rod 1, and a positioning ring 2 is connected to the push rod 1; the central processing unit 6, motor 4, push rod 1, and positioning ring 2 are all located on the axis of the main body 15 and are coaxial with the main body 15; the upper end of the main body 15 is connected to the fixed valve under the pump via a thread; the lower end of the main body 15 is connected to the lower oil pipe via a thread; the flow passage 3 of the main body 15 runs through the main body 15 from top to bottom; the proximity sensor 7 is fixed inside the upper end of the main body 15, close to the outside of the push rod 1, and the proximity sensor 7 corresponds to the positioning ring 2 in the axial direction; the internal temperature and pressure sensor 8 is fixed on the upper end face of the main body and avoids the positions of the flow passage 3 and the proximity sensor 7, and is used to test the temperature and pressure inside the oil pipe; the external temperature and pressure sensor 9 is located on the outer wall of the main body 15 and is used to test the temperature and pressure outside the oil pipe.

[0053] The intelligent device under the pump can perform the following functions:

[0054] Hydraulic packer setting: The intelligent device is installed at the bottom of the downhole electric pump, with its push rod in the position of pushing out the valve ball. The intelligent device is lowered into the well along with the production tubing. After the tubing is in place, water is injected into the tubing to pressurize it, and the hydraulic packer in the production tubing is set. Then, a command to retract the push rod is sent from the surface control cabinet via cable. The push rod of the intelligent device is retracted, the downhole valve ball falls into the valve seat, and the pump begins normal operation. During the retraction process, the positioning ring 2 on the downhole push rod 1 touches the proximity sensor 7. The proximity sensor 7 transmits the arrival signal to the central processing unit 6, and the central processing unit 6 sends the push rod retraction arrival signal to the surface control cabinet via cable 13.

[0055] Pump unloading: The ground control cabinet sends a push rod ejection command via cable to the central processing unit 6 of the intelligent device under the pump. The central processing unit 6 sends a command via control line 5 to control the motor 4 to move, and the push rod 1 moves upward to eject. The valve ball is pushed open from the valve seat, and the crude oil in the pump barrel is discharged.

[0056] Example 2

[0057] In a specific embodiment 2 of the present invention, such as Figure 3 As shown, the logic control method of the intelligent device under the pump includes:

[0058] (1) Read the signal from the ground control cabinet and determine whether the signal is a test or a control signal. If it is a test signal, proceed to step (3); if it is a control signal, proceed to step (2).

[0059] (2) Determine whether the command is a push rod extension command or a push rod retraction command; if it is a push rod extension command, proceed to step (4); if it is a push rod retraction command, proceed to step (5);

[0060] (3) Read the sensor data and send it to the ground control cabinet; return to step (1);

[0061] (4) Read the proximity sensor signal and determine whether the push rod has been extended; if the push rod has been extended, proceed to step (6); if the push rod has not been extended, proceed to step (8);

[0062] (5) Read the proximity sensor signal and determine whether the push rod has been retracted; if the push rod has been retracted, proceed to step (7); if the push rod has not been retracted, proceed to step (9);

[0063] (6) Send a signal that the top rod has been extended to the ground control cabinet;

[0064] (7) Send a signal that the top rod has been retrieved to the ground control cabinet;

[0065] (8) Drive the motor, and the push rod extends; return to step (4);

[0066] (9) Drive the motor and retract the push rod; return to step (5).

[0067] Example 3

[0068] In a specific embodiment of the present invention, the present invention can calculate the pump submersion degree: the pressure value P1 measured by the external pressure sensor 9 is calculated using the formula P1=ρ*g*h0; where ρ is the density of the oil-water mixture, g is the gravitational acceleration, and h0 is the submersion degree of the location of the intelligent device under the pump; therefore, h0=P1 / (ρ*g), and the pump submersion degree h2=h0-h1; where h1 is the distance between the pump and the intelligent device under the pump; the intelligent device under the pump can monitor and calculate the pump submersion degree h2 in real time.

[0069] Example 4

[0070] like Figure 4 As shown in the figure, this is a schematic diagram of the oil production tubing structure using the intelligent pump-down device. The surface control cabinet 3-1 is connected from top to bottom via cable 3-2 to the electric pump 3-4, the intelligent pump-down device 3-5, the intelligent production mixer 1 3-6, and the intelligent production mixer 2 3-8; the two intelligent production mixers correspond to two oil layers respectively; the hydraulic packer 3-7 is located between intelligent production mixer 1 and intelligent production mixer 2 in the tubing, used to separate the oil layers.

[0071] like Figure 4 Before running the tubing down the well, the intelligent pump-down device is in the push rod ejection state, and the production control switches of intelligent production controllers 1 and 2 are in the off state. After the tubing is in place, hydraulic pressure is applied through the tubing to set the hydraulically controlled packer 3-7; a push rod recovery command is sent from the surface control cabinet 3-1 to the intelligent pump-down device 3-5; an opening command is sent from the surface control cabinet to the intelligent production controller to open the corresponding oil layer; and the electric pump is started to begin oil production.

[0072] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0073] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

Claims

1. A method for using an intelligent device under a pump, comprising the intelligent device under a pump, characterized in that, The intelligent device under the pump includes a push rod, a positioning ring, a motor, a central processing unit, and a proximity sensor. The motor is connected to the lower end of the push rod, and the positioning ring is connected to the push rod. The central processing unit is connected to both the motor and the proximity sensor. The central processing unit receives control commands sent by the ground control cabinet and controls the motor to drive the push rod to move up and down according to the control commands. The proximity sensor collects the position information of the positioning ring and transmits the position information to the central processing unit to confirm the position of the push rod. The pump-mounted intelligent device also includes a body, which is a cylindrical rigid body. The central processing unit, the motor, the push rod, and the positioning ring are all located on the axis of the body and are coaxial with the body. The upper end of the body is connected to the fixed valve under the pump via a thread, and the lower end of the body is connected to the lower oil pipe via a thread. The body includes a flow channel that runs through the body from top to bottom; The proximity sensor is fixed inside the upper end of the body, close to the outside of the top rod, and the proximity sensor corresponds to the positioning ring in the axial direction; The pump-mounted intelligent device also includes an internal temperature and pressure sensor, which is fixed to the upper surface of the body and avoids the flow channel and the proximity sensor, and is used to test the temperature and pressure inside the pump-mounted oil pipe. The pump-mounted intelligent device also includes an external temperature and pressure sensor located on the outer wall of the main body, used to test the temperature and pressure outside the oil pipe; The method of use employs the aforementioned intelligent device under the pump, including: (1) The central processing unit reads the signal from the ground control cabinet and determines whether the signal instruction is a test or a control; if it is a test signal, proceed to step (3); if it is a control signal, proceed to step (2). (2) Determine whether the command is a push rod extension command or a push rod retraction command; if it is a push rod extension command, proceed to step (4); if it is a push rod retraction command, proceed to step (5). (3) The central processing unit reads the data from the proximity sensor, the internal temperature and pressure sensor and the external temperature and pressure sensor and sends it to the ground control cabinet; then returns to step (1). (4) Read the proximity sensor signal and determine whether the push rod has been extended; if the push rod has been extended, proceed to step (6); if the push rod has not been extended, proceed to step (8). (5) Read the proximity sensor signal and determine whether the push rod has been retracted; if the push rod has been retracted, proceed to step (7); if the push rod has not been retracted, proceed to step (9). (6) The central processing unit sends a signal that the push rod has been extended to the ground control cabinet; (7) Send a signal that the top rod has been retrieved to the ground control cabinet; (8) The central processing unit drives the motor, and the push rod extends; return to step (4); (9) Drive the motor and retract the push rod; return to step (5); In step (8), the central processing unit receives the push rod extension command from the ground control cabinet, and the central processing unit sends a command to control the motor to move, and the push rod moves upward to push out; the valve ball is pushed open from the valve seat, and the crude oil in the pump cylinder is discharged. In step (9), the central processing unit receives the push rod retraction command from the ground control cabinet. The central processing unit sends a command to control the motor to move. The push rod moves downward under the drive of the motor, and the lower valve ball of the pump falls into the valve seat, and the pump starts to work normally.

2. The method of using the intelligent device under the pump according to claim 1, characterized in that, The pressure value measured by the external pressure sensor is P1. According to the formula P1=ρ*g*h0, where ρ is the density of the oil-water mixture, g is the acceleration due to gravity, and h0 is the submersion degree of the intelligent device under the pump, h0=P1 / (ρ*g). The submersion degree of the pump is h2=h0-h1, where h1 is the distance between the pump and the intelligent device under the pump. The intelligent device under the pump can monitor and calculate the submersion degree of the pump h2 in real time.

3. The method of using the intelligent device under the pump according to claim 1, characterized in that, The downhole intelligent device also includes a cable, through which the central processing unit is connected to the surface control device; the central processing unit is connected to other downhole electrical equipment through the output end of the cable.

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