Process pipe column capable of intelligently dragging plunger to quickly flow back and flow back method of process pipe column

Abstract

The invention discloses an intelligent dragging plunger rapid flowback process pipe column and a flowback method thereof.The intelligent dragging plunger rapid flowback process pipe column comprises a plunger body, the plunger body is a cylinder, a steel wire cable is arranged at the top of the plunger body, the steel wire cable is connected with a steel wire take-up and pay-off machine, and the steel wire take-up and pay-off machine is controlled through an intelligent dragging system so as to drive the plunger body to move upwards or sink; a driving mechanism is arranged in the plunger body and drives the hydraulic oil piston rod to move up and down, so that the hydraulic oil is extruded to generate volume change, and expansion and contraction of the sealing colloid are controlled. According to the technical scheme, the defects in the prior art are overcome, intelligent operation can be achieved, the pressure change of the shaft is monitored, the operation procedure is changed, a sealing mechanism is matched, the performance of the intelligent plunger is effectively improved, accumulated liquid of the shaft of the gas well can be quickly returned and exhausted, and the purposes of activating the gas well and improving the production efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas well drainage and gas production, and in particular relates to an intelligent dragging plunger rapid return process pipe column and a return method thereof. Background Art

[0002] At present, in the process of domestic gas well exploration and development, water outflow from gas wells often leads to liquid accumulation in the wellbore, so effective drainage measures must be taken. To this end, a variety of drainage gas production processes have been proposed in practical applications, various drainage gas production downhole tools have been designed, and a variety of process models and operation design methods have been established. Professionals have compared and analyzed many drainage gas production process methods. At present, plunger gas lift is a relatively effective process.

[0003] As a process that uses the high-pressure gas energy of the gas well itself to push the plunger in the oil pipe to drain the liquid, the plunger gas lift process has the advantage of low energy consumption and will not cause damage to the reservoir. However, the plunger gas lift process requires that the gas production of the gas well itself is sufficient to push the plunger along the wellbore to complete the process stroke. Therefore, before implementing the plunger gas lift process, it is necessary to analyze the production status of the target well to determine whether the target well meets the plunger gas lift process. If not, the plunger gas lift process cannot be effectively implemented. In addition, the natural gas well is deep, and the plunger pump needs to move up and down quickly for efficiency reasons. Therefore, there needs to be a gap between the plunger pump and the pipe wall, otherwise the resistance will be too large, affecting the operating speed. However, in the process of lifting the liquid to the ground, some of the liquid will leak out along the gap between the plunger pump and the pipe wall, affecting work efficiency. How to effectively improve the efficiency of the plunger lift is an important issue in the field of gas well drainage and gas production. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an intelligent dragging plunger for rapid return process tubing and a return method thereof. The structure solves the problem that the previous plunger design surface is too large, resulting in leakage, and too small, resulting in slow speed, thereby proposing a better sealing mechanism and operating procedure, and effectively improving the efficiency of the plunger gas lift.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an intelligent dragging plunger fast return process pipe column, including a plunger body, the plunger body is a cylinder, a steel wire cable is provided on the top of the plunger body, the steel wire cable is connected to a steel wire retractor, and the steel wire retractor is controlled by an intelligent dragging system, thereby driving the plunger body to move up or down, and a driving mechanism is provided in the plunger body, and the driving mechanism drives the hydraulic oil piston rod to move up and down, thereby squeezing the hydraulic oil to cause a volume change, thereby realizing the control of the expansion and contraction of the sealing colloid.

[0006] Furthermore, the driving mechanism is a stepper motor, the lower end of the stepper motor is connected to one end of a transmission rod, the other end of the transmission rod is connected to the hydraulic oil piston rod, the transmission rod is a threaded rod, the inner wall of the plunger body is provided with a threaded buckle, the threaded rod cooperates with the threaded buckle, and the stepper motor drives the transmission rod to rotate, thereby realizing the up and down movement of the hydraulic oil piston rod.

[0007] Furthermore, the stepper motor is connected to the transmission rod via a coupling.

[0008] Furthermore, the plunger body includes a plunger housing and a bridge support tube, the plunger housing and the bridge support tube are connected via a connector, the plunger housing is a hollow structure, the stepper motor and the coupling are placed in the plunger housing, the stepper motor and the coupling are placed coaxially with the plunger housing, the hydraulic oil piston rod is placed in the bridge support tube, and the transmission rod is placed in the connector.

[0009] Furthermore, a circuit board is provided in the plunger body, the circuit board is electrically connected to the stepper motor, and the circuit board controls the forward or reverse rotation of the stepper motor.

[0010] Furthermore, an annulus pressure monitor and a formation pressure monitor are also provided in the plunger body. The annulus pressure monitor and the formation pressure monitor are electrically connected to the circuit board and the intelligent dragging system respectively. The annulus pressure monitor monitors the annulus pressure between the plunger body and the oil pipe, and the formation pressure monitor monitors the formation pressure.

[0011] Furthermore, the sealing colloid includes two groups, and the two groups of sealing colloid are respectively wrapped around the two ends of the bridge support tube.

[0012] Furthermore, a damper is provided at the bottom of the plunger body.

[0013] Furthermore, the present invention also provides a method for returning a flow column by using an intelligent drag plunger to quickly return a flow column, which uses the intelligent drag plunger to quickly return a flow column, and comprises the following steps:

[0014] S1: The wire retractor loosens the wire cable, allowing the plunger body to go down from the oil pipe;

[0015] S2: the plunger body moves downward until it sinks to the bottom of the oil pipe. During the downward movement of the plunger body, the check valve opens, and the liquid in the oil pipe flows to the upper part of the plunger body;

[0016] S3: After the plunger body moves to the bottom position, it moves upward, the check valve is closed, and the steel wire retractor tightens the steel wire cable, so that the plunger body and the liquid above it move upward, and the liquid flows out of the wellhead through the oil pipe, and negative pressure is generated under the plunger body, and the formation liquid flows into the wellbore;

[0017] S4: After the plunger body moves to the top position of the oil pipe, it moves downward again, and S1-S3 are repeated to discharge the liquid in the formation and the oil pipe.

[0018] Further, the S3 comprises the following steps:

[0019] S31: When the plunger body is immersed in the liquid accumulation in the gas wellbore, the annular pressure monitoring meter detects that the external pressure is greater than the pressure set inside the plunger body, and the pressure data is transmitted to the control system of the circuit board and the intelligent dragging system, and the intelligent dragging system controls the steel wire retracting and unreeling machine to start lifting the plunger body;

[0020] S32: The stepper motor rotates forward, driving the coupling to rotate, and the thread on the transmission rod rotates and moves upward through the thread buckle, pulling the hydraulic oil piston rod upward, so that the hydraulic oil space in the plunger body chamber is reduced, and the squeezed hydraulic oil flows to the sealing colloid to expand it, thereby sealing the inner wall of the oil pipe;

[0021] S33: Pull the hydraulic oil piston rod upward, the lower channel of the plunger body opens, the gas wellbore liquid flows from the damper to the wellbore liquid chamber of the plunger body, and flows to the oil pipe and the annulus of the plunger body through the side wall channel, and the expanded lower sealing colloid prevents the liquid in the wellbore from flowing back;

[0022] S34: the steel wire cable is pulled upward to lift the annular liquid to the surface;

[0023] S35: The plunger body rises, and when the pressure value monitored by the formation pressure monitor is greater than the pressure value monitored by the annulus pressure monitor, the parameter information is transmitted to the control system of the circuit board and the ground intelligent dragging system, driving the stepper motor to reverse and close the hydraulic oil piston rod. The internal seal of the plunger body prevents the wellbore fluid from entering the interior, and the plunger body is lowered. When the annulus pressure monitor detects that the external pressure is greater than the pressure set inside the tool, the wellbore liquid is discharged upward, and the above drainage process is repeated to achieve the purpose of quickly returning the wellbore liquid to the gas well.

[0024] The advantages and positive effects of the present invention are:

[0025] The present invention overcomes the shortcomings of the prior art. The existing gas well drainage technology is mostly mechanized drainage, which has low efficiency. Once the wellbore accumulates too much liquid, it cannot be drained in a short time, which will damage the gas layer. The process scheme of the present invention can realize intelligent operation, monitor the change of wellbore pressure to change the operation procedure, and cooperate with the sealing mechanism to effectively improve the performance of the intelligent plunger. It improves the rapid return of gas wellbore liquid accumulation, achieves the purpose of activating the gas well and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the process column structure of an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the plunger body structure of an embodiment of the present invention.

[0028] Figure 3 It is an overall flow chart of another embodiment of the present invention.

[0029] In the figure:

[0030] 1. Steel wire cable; 2. Circuit board; 3. Stepper motor;

[0031] 4. Coupling; 5. Annular pressure monitoring meter; 6. Formation pressure monitoring meter;

[0032] 7. Transmission rod; 8. Elastic straightening block; 9. Connector;

[0033] 10. Hydraulic oil piston rod; 11. Bridge support pipe; 12. Sealing colloid;

[0034] 13. Damper; 14. Plunger body; 15. Wire retractor;

[0035] 16. Intelligent dragging system. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0040] like Figure 1 As shown, an intelligent drag plunger rapid return process string includes a plunger body 14, which is a cylinder. A steel cable 1 is provided on the top of the plunger body 14, and the steel cable 1 is connected to a steel wire retractor 15. The steel wire retractor 15 is controlled by an intelligent drag system 16, thereby driving the plunger body 14 to move up or down. A driving mechanism is provided in the plunger body 14, and the driving mechanism drives the hydraulic oil piston rod 10 to move up and down, thereby squeezing the hydraulic oil to change its volume, thereby controlling the expansion and contraction of the sealing colloid 12.

[0041] The driving mechanism is a device that drives the hydraulic oil piston rod 10 to move up and down. The driving mechanism can be of various structures as long as the above functions are achieved. Figure 2 As shown, the driving mechanism provided in this embodiment is a stepping motor 3.

[0042] Preferably, Figure 2As shown, the plunger body 14 includes a plunger housing, which is a hollow structure. The stepper motor 3 and the coupling 4 are connected in sequence from top to bottom in the hollow structure of the plunger housing. The stepper motor 3 and the coupling 4 are placed coaxially with the plunger housing. The bottom of the plunger housing is connected to the bridge support tube 11 through a connector 9. The connector 9 and the bridge support tube 11 are both hollow structures. A transmission rod 7 is provided in the hollow structure of the connector 9. One end of the transmission rod 7 is connected to the coupling 4, and the other end is connected to the hydraulic oil piston rod 10. The transmission rod 7 is a threaded rod. The inner wall of the connector 9 is provided with a threaded buckle. The threaded rod cooperates with the threaded buckle. The stepper motor 3 drives the transmission rod 7 to rotate, squeezes the hydraulic oil, and realizes the up and down movement of the hydraulic oil piston rod 10, thereby squeezing the hydraulic oil to cause a volume change to control the expansion and contraction of the upper and lower sealing colloids 12.

[0043] like Figure 2 As shown, a circuit board 2 is provided in the plunger housing, and the circuit board 2 is electrically connected to a stepper motor 3. The circuit board 2 controls the stepper motor 3 to rotate forward or reverse, thereby controlling the liquid inlet and outlet switch.

[0044] Preferably, an annulus pressure monitoring gauge 5 and a formation pressure monitoring gauge 6 are also provided in the connector 9. Both the annulus pressure monitoring gauge 5 and the formation pressure monitoring gauge 6 are electrically connected to the circuit board 2 and the intelligent dragging system 16. The annulus pressure monitoring gauge 5 monitors the annulus pressure between the plunger body 14 and the oil pipe, and the formation pressure monitoring gauge 6 monitors the formation pressure.

[0045] When the plunger body 14 is immersed in the accumulated liquid in the gas wellbore and the annulus pressure monitoring meter 5 detects that the external pressure is greater than the pressure set inside the plunger body 14, the stepper motor 3 rotates forward, driving the coupling 4 to rotate, and the thread on the transmission rod 7 rotates and moves upward through the threaded buckle, pulling the hydraulic oil piston rod 10 upward, causing the hydraulic oil space in the chamber of the plunger body 14 to shrink, and the squeezed hydraulic oil flows to the sealing colloid 12 to expand it, thereby sealing the inner wall of the oil pipe.

[0046] When the pressure value monitored by the formation pressure monitoring meter 6 is greater than the value monitored by the annulus pressure monitoring meter 5, the parameter information is transmitted to the control system of the circuit board 2 and the ground intelligent dragging system 16, driving the stepper motor 3 to reverse, closing the hydraulic oil piston rod 10, and the internal seal of the plunger body 14 prevents the wellbore fluid from entering its interior, and the plunger body 14 is lowered.

[0047] like Figure 2 As shown, the outer cylindrical surface of the connector 9 is provided with an elastic straightening block 8, and the elastic straightening block 8 straightens the plunger body 14, which is convenient for sealing and lifting and lowering operations. The sealing colloid 12 includes two groups, and the two groups of sealing colloids 12 are respectively wrapped at the two ends of the bridge support pipe 11. The sealing colloid 12 shrinks when the lower pressure is large, and expands when the upper pressure is large. The bridge support pipe 11 has a bridge structure, and the formation fluid flows to the annulus through hydraulic oil.

[0048] like Figure 2 As shown, a damper 13 is provided at the bottom of the bridge support tube 11, and the damper 13 prevents the smart plunger from bumping and protects the tool by shock absorption.

[0049] like Figure 3 As shown, the present invention also provides a method for returning a flow through a process column of an intelligent drag plunger for rapid return flow, which utilizes the intelligent drag plunger for rapid return flow through a process column of an intelligent drag plunger for rapid return flow, and comprises the following steps:

[0050] S1: The wire retractor 15 releases the wire cable 1, allowing the plunger body 14 to be lowered into the oil pipe.

[0051] S2: The plunger body 14 moves downward until it sinks to the bottom of the oil pipe. During the downward movement of the plunger body 14 , the check valve opens, and the liquid in the oil pipe flows to the upper part of the plunger body 14 .

[0052] S3: After the plunger body 14 moves to the bottom position, it moves upward, the check valve is closed, and the wire retractor 15 tightens the wire cable 1, causing the plunger body 14 and the liquid above it to move upward. The liquid flows out of the wellhead through the oil pipe, and negative pressure is generated under the plunger body 14, and the formation liquid flows into the wellbore.

[0053] S4: After the plunger body 14 moves to the top of the oil pipe, it moves downward again, repeating S1-S3 to discharge the liquid in the formation and the oil pipe.

[0054] The working principle of the present invention is as follows:

[0055] The wire retractor 15 loosens the wire cable 1, allowing the plunger body 14 to be lowered from the oil pipe until it reaches the inside of the gas wellbore. During the lowering process of the plunger body 14, collisions, impacts, frictions, etc. may occur. At this time, the spring contained in the damper 13 will play a shock-absorbing role for the plunger body 14 and protect the tool. When the plunger body 14 is immersed in the liquid accumulation in the gas wellbore, the annulus pressure monitoring meter 5 detects that the external pressure is greater than the pressure set inside the tool, and the data of the pressure parameters is transmitted to the circuit board 2 control system, and transmitted to the intelligent dragging system 16 on the ground, sending instructions to control the wire retractor 15 to start lifting the wire cable 1, and the plunger body 14 is lifted by the wire cable 1. At the same time, the stepper motor 3 inside the plunger body 14 tool rotates forward, driving the coupling 4 to rotate, and the thread on the rotating rod 7 rotates and moves upward through the thread buckle. The screw is embedded in the outer wall, pulling the hydraulic oil piston rod 10 to move upward, causing the hydraulic oil space in the chamber of the plunger body 14 to shrink, and the squeezed hydraulic oil flows to the sealing colloid 12 to expand it, thereby achieving the effect of sealing the inner wall of the oil pipe.

[0056] At the same time, the hydraulic oil piston rod 10 is pulled upward, the lower channel of the plunger body 14 is opened, and the gas wellbore liquid flows from the damper 13 to the wellbore liquid chamber of the plunger body 14, and flows to the annulus of the oil pipe and the plunger body 14 through the side wall channel. However, at this time, the sealing colloid 12 at the bottom has expanded, preventing the liquid in the wellbore from flowing back, and the steel wire cable 1 is pulled upward to lift the annulus liquid to the ground, achieving the effect of gas wellbore drainage. When the plunger body 14 reaches a certain height, the pressure value monitored by the formation pressure monitoring meter 6 is greater than the value monitored by the annulus pressure monitoring meter 5, and the parameters are transmitted to the circuit board 2 control system and the ground intelligent dragging system 16, the stepper motor 3 reverses, closes the hydraulic oil piston rod 10, and the internal seal of the plunger body 14 prevents the wellbore liquid from entering the tool. At the same time, the plunger body 14 is lowered to a certain depth. At this time, the annulus pressure monitoring meter 5 detects that the external pressure is greater than the pressure set inside the tool, and the wellbore liquid is discharged upward. Repeat the above drainage process to achieve the purpose of quickly returning the gas wellbore liquid.

[0057] The advantages and positive effects of the present invention are:

[0058] The present invention overcomes the shortcomings of the prior art. The existing gas well drainage technology is mostly mechanized drainage, which has low efficiency. Once the wellbore accumulates too much liquid, it cannot be drained in a short time, which will damage the gas layer. The process scheme of the present invention can realize intelligent operation, monitor the change of wellbore pressure to change the operation procedure, and cooperate with the sealing mechanism to effectively improve the performance of the intelligent plunger. It improves the rapid return of gas wellbore liquid accumulation, achieves the purpose of activating the gas well and improving production efficiency.

[0059] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An intelligent drag plunger rapid flowback process column, Features: It includes a plunger body, which is a cylinder. A steel cable is provided on the top of the plunger body. The steel cable is connected to a steel wire retractor. The steel wire retractor is controlled by an intelligent dragging system to drive the plunger body to move up or down. A driving mechanism is provided in the plunger body. The driving mechanism drives the hydraulic oil piston rod to move up and down, thereby squeezing the hydraulic oil to cause a volume change, thereby controlling the expansion and contraction of the sealing colloid.

2. According to claim 1, an intelligent drag plunger rapid flowback process column, Features: The driving mechanism is a stepper motor, the lower end of the stepper motor is connected to one end of a transmission rod, the other end of the transmission rod is connected to the hydraulic oil piston rod, the transmission rod is a threaded rod, the inner wall of the plunger body is provided with a threaded buckle, the threaded rod cooperates with the threaded buckle, and the stepper motor drives the transmission rod to rotate, thereby realizing the up and down movement of the hydraulic oil piston rod.

3. According to claim 2, an intelligent drag plunger rapid flowback process column, Features: The stepper motor is connected to the transmission rod via a coupling.

4. According to claim 3, an intelligent drag plunger rapid flowback process column, Features: The plunger body includes a plunger housing and a bridge support tube, the plunger housing and the bridge support tube are connected via a connector, the plunger housing is a hollow structure, the stepper motor and the coupling are placed in the plunger housing, the stepper motor and the coupling are placed coaxially with the plunger housing, the hydraulic oil piston rod is placed in the bridge support tube, and the transmission rod is placed in the connector.

5. An intelligent drag plunger rapid flowback process column according to any one of claims 2 to 4, Features: A circuit board is arranged in the plunger body, the circuit board is electrically connected to the stepping motor, and the circuit board controls the stepping motor to rotate forward or reverse.

6. According to claim 5, an intelligent drag plunger rapid flowback process column, Features: An annulus pressure monitor and a formation pressure monitor are also provided in the plunger body. The annulus pressure monitor and the formation pressure monitor are electrically connected to the circuit board and the intelligent dragging system respectively. The annulus pressure monitor monitors the annulus pressure between the plunger body and the oil pipe, and the formation pressure monitor monitors the formation pressure.

7. The intelligent drag plunger rapid flowback process column according to claim 4, Features: The sealing colloid comprises two groups, and the two groups of sealing colloid are respectively wrapped at two ends of the bridge support tube.

8. An intelligent drag plunger rapid flowback process column according to any one of claims 1 to 4, Features: A damper is provided at the bottom of the plunger body.

9. A method for returning a pipe column by using an intelligent drag plunger for rapid return flow, using the intelligent drag plunger for rapid return flow process column as claimed in any one of claims 1 to 8, Features: The following steps are included: S1: The wire retractor loosens the wire cable, allowing the plunger body to go down from the oil pipe; S2: the plunger body moves downward until it sinks to the bottom of the oil pipe. During the downward movement of the plunger body, the check valve opens, and the liquid in the oil pipe flows to the upper part of the plunger body; S3: After the plunger body moves to the bottom position, it moves upward, the check valve is closed, and the steel wire retractor tightens the steel wire cable, so that the plunger body and the liquid above it move upward, and the liquid flows out of the wellhead through the oil pipe, and negative pressure is generated under the plunger body, and the formation liquid flows into the wellbore; S4: After the plunger body moves to the top position of the oil pipe, it moves downward again, and S1-S3 are repeated to discharge the liquid in the formation and the oil pipe.

10. The intelligent drag plunger rapid flowback process column flowback method according to claim 9, Features: The S3 comprises the following steps, S31: When the plunger body is immersed in the liquid accumulation in the gas wellbore, the annular pressure monitoring meter detects that the external pressure is greater than the pressure set inside the plunger body, and the pressure data is transmitted to the control system of the circuit board and the intelligent dragging system, and the intelligent dragging system controls the steel wire retracting and unreeling machine to start lifting the plunger body; S32: The stepper motor rotates forward, driving the coupling to rotate, and the thread on the transmission rod rotates and moves upward through the thread buckle, pulling the hydraulic oil piston rod upward, so that the hydraulic oil space in the plunger body chamber is reduced, and the squeezed hydraulic oil flows to the sealing colloid to expand it, thereby sealing the inner wall of the oil pipe; S33: Pull the hydraulic oil piston rod upward, the lower channel of the plunger body opens, the gas wellbore liquid flows from the damper to the wellbore liquid chamber of the plunger body, and flows to the oil pipe and the annulus of the plunger body through the side wall channel, and the expanded lower sealing colloid prevents the liquid in the wellbore from flowing back; S34: the steel wire cable is pulled upward to lift the annular liquid to the surface; S35: The plunger body rises, and when the pressure value monitored by the formation pressure monitor is greater than the pressure value monitored by the annulus pressure monitor, the parameter information is transmitted to the control system of the circuit board and the ground intelligent dragging system, driving the stepper motor to reverse and close the hydraulic oil piston rod. The internal seal of the plunger body prevents the wellbore fluid from entering the interior, and the plunger body is lowered. When the annulus pressure monitor detects that the external pressure is greater than the pressure set inside the tool, the wellbore liquid is discharged upward, and the above drainage process is repeated to achieve the purpose of quickly returning the wellbore liquid to the gas well.

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