Monitoring system for steel cable bailing process of gas well

Abstract

The invention discloses a monitoring system for a gas well steel cable bailing process, and relates to the field of oil and gas well drainage gas recovery. The monitoring system for the gas well steel cable bailing process comprises a pressure sensor, a torque sensor, a rotating speed sensor and a ground controller. The pressure sensor is arranged at the bottom of a bailing swab in the bailing tool string group; the torque sensor and the rotating speed sensor are both arranged on a vehicle-mounted winch with a derrick; and the ground controller is used for controlling the vehicle-mounted winch with the derrick and monitoring the state of the gas well according to signals monitored by the sensors. Automatic control over the gas well steel cable bailing process and automatic monitoring of the gas well state are achieved.

Description

Technical Field

[0001] The present application relates to the field of oil and gas well drainage and gas production, and in particular to a monitoring system for the steel cable bailing process of a gas well. Background Art

[0002] In the prior art, when draining water from oil and gas wells to produce gas, the drainage process is usually controlled manually, which cannot achieve effective and accurate control, is time-consuming and labor-intensive, and sometimes even dangerous. Summary of the invention

[0003] The purpose of the present application is to provide a monitoring system for the gas well cable bailing process, which can realize automatic control of the gas well cable bailing process and automatic monitoring of the gas well status.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a monitoring system for a gas well steel cable catching process, the monitoring system being used for controlling a gas well steel cable catching device and monitoring a gas well status, the gas well steel cable catching device comprising: a catching tool string group, a steel cable and a vehicle-mounted derrick winch; the steel cable is wound around the vehicle-mounted derrick winch, and the end of the steel cable is connected to the catching tool string group;

[0006] The monitoring system for the gas well cable bailing process comprises: a pressure sensor, a torque sensor, a rotation speed sensor and a ground controller;

[0007] The pressure sensors are respectively arranged at the bottom of the lifting drawers in the lifting tool string group;

[0008] The torque sensor and the rotation speed sensor are both arranged on the vehicle-mounted derrick winch;

[0009] The pressure sensor, the torque sensor and the speed sensor are all connected to the ground controller; the ground controller is connected to the control end of the vehicle-mounted derrick winch;

[0010] The ground controller is used to control the vehicle-mounted derrick winch and monitor the gas well status according to the pressure signal, torque signal and speed signal; the pressure signal is the pressure at the bottom of the lifting pump detected by the pressure sensor, the torque signal is the torque of the vehicle-mounted derrick winch detected by the torque sensor, and the speed signal is the speed of the vehicle-mounted derrick winch detected by the speed sensor.

[0011] Optionally, the monitoring system for the gas well cable bailing process further includes a wireless communication module;

[0012] The wireless communication module is arranged on the fishing tool string group, the wireless communication module is connected to the pressure sensor by wire, and the wireless communication module is connected to the ground controller by wireless.

[0013] Optionally, in terms of controlling the vehicle-mounted derrick winch, the ground controller is specifically used to:

[0014] It is determined according to the pressure signal whether the bailing pump has been lowered to the preset depth of the accumulated water. When it is lowered to the preset depth of the accumulated water, the vehicle-mounted derrick winch is controlled to rotate in the opposite direction, so that the bailing tool string group is changed from a lowered state to a lifted state.

[0015] Optionally, in terms of monitoring the status of the gas well, the surface controller is specifically used to:

[0016] It is determined whether the salvage pump has entered the underground water based on the pressure signal, and when entering the underground water, the distance between the liquid surface of the underground water and the wellhead is calculated based on the rotation speed signal and the target time difference; the target time difference is the time difference between the moment when the salvage pump starts to be lowered from the wellhead to the moment when it enters the underground water.

[0017] Optionally, in terms of monitoring the status of the gas well, the surface controller is further used to:

[0018] The mass of the accumulated water lifted out in a single time is calculated according to the torque signal, and the mass of the accumulated water lifted out in a single time is counted to obtain the total amount of discharged liquid.

[0019] Optionally, in terms of monitoring the status of the gas well, the surface controller is further used to:

[0020] Determine whether the pumping is completed based on the pressure signal.

[0021] Optionally, the fishing tool string group includes: a rope cap, a first weight rod, a second weight rod, a chain jar, an anti-upward tool, a hand-dropping tool and a fishing drawer arranged in sequence from top to bottom;

[0022] The rope cap is used for connecting the steel cable.

[0023] Optionally, the lifting pump comprises: an upper joint, a limit oil ring, a connecting rod, an oil groove, a rubber tube upper gland, an upper rubber tube, a rubber tube connecting sleeve, a lower rubber tube, a guide sealing head, a lower joint and a limit stop platform;

[0024] The connecting rod and the lower joint are locked by means of threaded connection, and the guide sealing head, the lower rubber sleeve, the rubber cylinder connecting sleeve, the upper rubber sleeve, and the rubber cylinder upper pressure cover are connected in sequence by means of threaded connection to form a sleeve assembly, and the sleeve assembly is sleeved on the outside of the connecting rod, the limit oil ring is connected to the connecting rod by means of threaded connection, and the upper joint is screwed into the connecting rod above the limit oil ring by means of threaded connection and locked; the oil groove and the limit stop are arranged on the circumference of the connecting rod.

[0025] Optionally, the anti-upward movement tool comprises: a male joint, an intermediate short joint, a coupling, a movable tapered mandrel thread, a clamping ring, a clamping hoop, a slip piece, a ball seat, a sliding sleeve, a male and female joint and a round ball;

[0026] The male joint is threadedly connected to the middle short joint, a coupling is installed in the inner hole of the middle short joint, the coupling is threadedly connected to the movable conical core shaft, a clamping ring is welded on the outer diameter of the movable conical core shaft, a clamping ring is welded on the clamping ring, the clamping ring, the clamping ring and the cava piece are all in contact connection, the clamping ring and the clamping ring play the role of fixing and limiting the cava piece, the cava piece is sleeved in the annular groove of the middle short joint, the middle short joint is in contact connection with the movable conical core shaft, the movable conical core shaft is threadedly connected to the ball seat, the ball seat is in contact connection with the sliding sleeve and is placed in the inner hole of the sliding sleeve, the sliding sleeve is threadedly connected to the male and female joints, the male and female joints are in contact connection with the ball, and the ball is placed in the cavity formed by the sliding sleeve, the ball seat and the male and female joints.

[0027] Optionally, the steel cable includes a center line and multiple layers of steel strands arranged outside the center line.

[0028] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0029] The present application provides a monitoring system for the steel cable bailing process of a gas well, and the monitoring system for the steel cable bailing process of a gas well includes: a pressure sensor, a torque sensor, a speed sensor and a ground controller; the pressure sensor is arranged at the bottom of the bailing pump in the bailing tool string group; the torque sensor and the speed sensor are both arranged on a vehicle-mounted derrick winch; the vehicle-mounted derrick winch is controlled and the gas well status is monitored by the ground controller according to the signals monitored by each sensor. The present application realizes the automatic control of the steel cable bailing process of a gas well and the automatic monitoring of the gas well status. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1A schematic diagram of the structure of a monitoring system for a gas well cable bailing process provided in one embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a fishing tool string group provided in one embodiment of the present application;

[0033] Figure 3 A schematic cross-sectional view of a steel cable provided in accordance with an embodiment of the present application.

[0034] Figure numerals: 1. Rope cap; 2. First weight rod; 3. Second weight rod; 4. Chain jar; 5. Anti-upward tool; 6. Hand-release tool; 7. Lifting drawer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] In an exemplary embodiment, Figure 1 As shown, a monitoring system for the gas well steel cable catching process is provided, the monitoring system is used for controlling the gas well steel cable catching device and monitoring the gas well status, the gas well steel cable catching device comprises: a catching tool string group, a steel cable and a vehicle-mounted derrick winch; the steel cable is wound around the vehicle-mounted derrick winch, and the end of the steel cable is connected to the catching tool string group; the monitoring system for the gas well steel cable catching process comprises: a pressure sensor, a torque sensor, a speed sensor and a ground controller; the pressure sensors are respectively arranged at the bottom of the catching pump in the catching tool string group.

[0038] The torque sensor and the speed sensor are both arranged on the vehicle-mounted derrick winch; the pressure sensor, the torque sensor and the speed sensor are all connected to the ground controller; the ground controller is connected to the control end of the vehicle-mounted derrick winch; the ground controller is used to control the vehicle-mounted derrick winch and monitor the gas well status according to the pressure signal, the torque signal and the speed signal; the pressure signal is the pressure at the bottom of the lifting pump detected by the pressure sensor, the torque signal is the torque of the vehicle-mounted derrick winch detected by the torque sensor, and the speed signal is the speed of the vehicle-mounted derrick winch detected by the speed sensor.

[0039] In the above embodiment, a wireless communication module is also provided to realize signal transmission, specifically: the wireless communication module is provided on the lifting tool string group, the wireless communication module is connected to the pressure sensor by wire, and the wireless communication module is connected to the ground controller wirelessly.

[0040] In the above embodiment, the monitoring system mainly realizes the control of the vehicle-mounted derrick winch and the monitoring of the gas well status.

[0041] Among them, in terms of controlling the vehicle-mounted derrick winch, the ground controller is specifically used for:

[0042] It is determined according to the pressure signal whether the bailing pump has been lowered to the preset depth of the accumulated water. When it is lowered to the preset depth of the accumulated water, the vehicle-mounted derrick winch is controlled to rotate in the opposite direction, so that the bailing tool string group is changed from a lowered state to a lifted state.

[0043] In terms of gas well status monitoring, automatic liquid level identification and automatic liquid discharge statistics are realized, including:

[0044] It is determined whether the salvage pump has entered the underground water based on the pressure signal, and when entering the underground water, the distance between the liquid surface of the underground water and the wellhead is calculated based on the rotation speed signal and the target time difference; the target time difference is the time difference between the moment when the salvage pump starts to be lowered from the wellhead to the moment when it enters the underground water.

[0045] The mass of the accumulated water lifted out in a single time is calculated according to the torque signal, and the mass of the accumulated water lifted out in a single time is counted to obtain the total amount of discharged liquid.

[0046] Determine whether the pumping is completed based on the pressure signal.

[0047] like Figure 2 As shown, the lifting tool string set in this embodiment includes a rope cap 1 + a first weighted rod 2 + a second weighted rod 3 + a chain jar 4 + an anti-upward tool 5 + a hand-dropping tool 6 + a lifting drawer 7, which has good liquid carrying capacity, and has anti-upward and jam-release functions. The weighted rod and the jar can effectively improve the overall downward speed and stability of the tool string, and at the same time have good jam-release capabilities, increasing the safety of the operation.

[0048] Among them, the lifting pump 7 separates the rubber tube and the core shaft during the lowering process, and a flow channel appears; when lifting, the rubber tube and the connecting rod are closed, and the channel is closed. Liquid will gather on the upper part of the rubber tube, and under the action of the upper liquid, the rubber tube expands outside and contacts and seals with the inner wall of the pipe column, lifting the liquid on the upper part of the rubber tube to the ground. The specific structural features are as follows:

[0049] (1) According to actual needs, a single rubber cartridge can be used or multiple cartridges can be used in combination.

[0050] (2) The rubber tube is made of multiple steel cable skeletons inside and high-hardness wear-resistant rubber vulcanized on the outside.

[0051] (3) Normally, under the action of a 100-meter liquid column, the rubber cylinder will seal against the pipe wall.

[0052] The anti-upward movement tool 5 is mainly composed of a male joint, an intermediate short joint, a coupling, a movable tapered mandrel thread, a clamp ring, a clamp, a slip sheet, a ball seat, a sleeve, a male and female joint, and a ball. When the upward force of the downhole fluid is greater than the weight of the tool, the sleeve will be pushed upward, and the movable tapered mandrel thread will push the clamp upward to bite the inner wall of the oil pipe to prevent upward movement. It has the following structural features:

[0053] (1) Connect the downhole tool string or instrument to the lower part of the anti-upward movement tool and tighten the threads.

[0054] (2) Lift the tool string and check whether the claws can be retracted into the body.

[0055] (3) Connect the upper end of the anti-upward movement tool under the rope cap and tighten the threads.

[0056] (4) Install the assembled tool string into the blowout preventer.

[0057] (5) Assemble the ground blowout prevention system.

[0058] (6) Open the wellhead and lower the tools into the well.

[0059] (7) After the operation is completed, the tool can be removed by lifting it up.

[0060] The chain jar 4 is mainly composed of a main and auxiliary chain for jarring. The action process causes the main and auxiliary chains to produce a relatively large relative motion speed, and then the main and auxiliary chains collide to generate an impact force.

[0061] When the first weight rod 2 + the second weight rod 3 are used, appropriate weights can be selected for operation according to the needs, and the weight calculation method is:

[0062] Assume that the cross-sectional area of ​​the cable is: A = πr 2 =3.14×(0.0055)2=94.985×10-6m 2 , the upward force generated is: F1=PA=1×106×94.985×10-6=9.4985kgf, then the upward force generated by the 3MPa pipe pressure is: F3=9.4985×3=29.84955kgf, at this time, at least 30kg of the first weight rod 2 + the second weight rod 3 are needed for counterweight.

[0063] like Figure 3 As shown, in this embodiment, the steel cable includes a center line and multiple layers of steel strands arranged outside the center line.

[0064] In this embodiment, a wellhead blowout prevention system is also provided at the wellhead, and the steel cable passes through the wellhead blowout prevention system to enter the well. The wellhead blowout prevention system includes a double-gate blowout preventer (BOP), a blowout preventer assembly, a grease injection sealing head, a grease injection pump, etc. The maximum working pressure is 35 MPa. The selected double-gate blowout preventer has three functions: full sealing, semi-sealing, and shearing to ensure safety during operation.

[0065] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A monitoring system for the steel cable bailing process of a gas well, characterized in that: The monitoring system for the gas well steel cable catching process is used for controlling the gas well steel cable catching device and monitoring the gas well status. The gas well steel cable catching device comprises: a catching tool string group, a steel cable and a vehicle-mounted derrick winch; the steel cable is wound around the vehicle-mounted derrick winch, and the end of the steel cable is connected to the catching tool string group; The monitoring system for the gas well cable bailing process comprises: a pressure sensor, a torque sensor, a rotation speed sensor and a ground controller; The pressure sensors are respectively arranged at the bottom of the lifting drawers in the lifting tool string group; The torque sensor and the rotation speed sensor are both arranged on the vehicle-mounted derrick winch; The pressure sensor, the torque sensor and the speed sensor are all connected to the ground controller; the ground controller is connected to the control end of the vehicle-mounted derrick winch; The ground controller is used to control the vehicle-mounted derrick winch and monitor the gas well status according to the pressure signal, torque signal and speed signal; the pressure signal is the pressure at the bottom of the lifting pump detected by the pressure sensor, the torque signal is the torque of the vehicle-mounted derrick winch detected by the torque sensor, and the speed signal is the speed of the vehicle-mounted derrick winch detected by the speed sensor.

2. The monitoring system for the gas well cable bailing process according to claim 1 is characterized in that: The monitoring system for the gas well cable bailing process also includes a wireless communication module; The wireless communication module is arranged on the fishing tool string group, the wireless communication module is connected to the pressure sensor by wire, and the wireless communication module is connected to the ground controller by wireless.

3. The monitoring system for gas well cable bailing process according to claim 1 is characterized in that: In terms of controlling the vehicle-mounted derrick winch, the ground controller is specifically used for: It is determined according to the pressure signal whether the bailing pump has been lowered to the preset depth of the accumulated water. When it is lowered to the preset depth of the accumulated water, the vehicle-mounted derrick winch is controlled to rotate in the opposite direction, so that the bailing tool string group is changed from a lowered state to a lifted state.

4. The monitoring system for gas well cable bailing process according to claim 1, characterized in that: In terms of monitoring the status of the gas well, the surface controller is specifically used for: It is determined whether the salvage pump has entered the underground water based on the pressure signal, and when entering the underground water, the distance between the liquid surface of the underground water and the wellhead is calculated based on the rotation speed signal and the target time difference; the target time difference is the time difference between the moment when the salvage pump starts to be lowered from the wellhead to the moment when it enters the underground water.

5. The monitoring system for the gas well cable bailing process according to claim 4 is characterized in that: In terms of monitoring the status of the gas well, the surface controller is also used to: The mass of the accumulated water lifted out in a single time is calculated according to the torque signal, and the mass of the accumulated water lifted out in a single time is counted to obtain the total amount of discharged liquid.

6. The monitoring system for the gas well cable bailing process according to claim 4 or 5, characterized in that: In terms of monitoring the status of the gas well, the surface controller is also used to: Determine whether the pumping is completed based on the pressure signal.

7. The monitoring system for gas well cable bailing process according to claim 1, characterized in that: The fishing tool string group includes: a rope cap, a first weight rod, a second weight rod, a chain jar, an anti-upward tool, a hand-dropping tool and a fishing drawer arranged in sequence from top to bottom; The rope cap is used for connecting the steel cable.

8. The monitoring system for the gas well cable bailing process according to claim 7, characterized in that: The lifting pump comprises: an upper joint, a limit oil ring, a connecting rod, an oil groove, a rubber tube upper gland, an upper rubber tube, a rubber tube connecting sleeve, a lower rubber tube, a guide sealing head, a lower joint and a limit stopper; The connecting rod and the lower joint are locked by means of threaded connection, and the guide sealing head, the lower rubber sleeve, the rubber cylinder connecting sleeve, the upper rubber sleeve, and the rubber cylinder upper pressure cover are connected in sequence by means of threaded connection to form a sleeve assembly, and the sleeve assembly is sleeved on the outside of the connecting rod, the limit oil ring is connected to the connecting rod by means of threaded connection, and the upper joint is screwed into the connecting rod above the limit oil ring by means of threaded connection and locked; the oil groove and the limit stop are arranged on the circumference of the connecting rod.

9. The monitoring system for the gas well cable bailing process according to claim 7, characterized in that: The anti-upward tool includes: a male joint, an intermediate short joint, a coupling, a movable tapered mandrel thread, a retaining ring, a clamp, a slip piece, a ball seat, a sliding sleeve, a male and female joint and a round ball; The male joint is threadedly connected to the middle short section, a coupling is installed in the inner hole of the middle short section, the coupling is threadedly connected to the movable conical core shaft, a clamping ring is welded on the outer diameter of the movable conical core shaft, a clamping ring is welded on the clamping ring, the clamping ring, the clamping ring and the cava piece are all contact-connected, the clamping ring and the clamping ring play the role of fixing and limiting the cava piece, the cava piece is sleeved in the annular groove of the middle short section, the middle short section is contact-connected to the movable conical core shaft, the movable conical core shaft is threadedly connected to the ball seat, the ball seat is contact-connected to the sliding sleeve and placed in the inner hole of the sliding sleeve, the sliding sleeve is threadedly connected to the male and female joints, the male and female joints are contact-connected to the ball, and the ball is placed in the cavity formed by the sliding sleeve, the ball seat and the male and female joints.

10. The monitoring system for gas well cable bailing process according to claim 1, characterized in that: The steel cable comprises a center line and multiple layers of steel strands arranged outside the center line.

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