Cable tension monitoring pup joint for cross-core fishing and matching assembly of cable tension monitoring pup joint

Abstract

A cable tension monitoring nipple for cross-core fishing and a matching assembly thereof relate to the field of cable tension monitoring, the tension monitoring nipple comprises an upper joint, a lower joint, a tensiometer and a connecting sleeve, the tensiometer and the connecting sleeve are connected between the upper joint and the lower joint, and the upper end of the upper joint and the lower end of the lower joint are respectively provided with a quick connecting mechanism. The connecting sleeve is provided with an aviation plug connected with the tensiometer through a line, the cable tension monitoring short section matching assembly is composed of a female connector, a male connector and a tension monitoring short section, the female connector comprises an upper rope socket and an upper die sleeve, and the male connector comprises a lower die rod and a lower rope socket. The upper joint of the tension monitoring short section can be correspondingly matched and quickly connected with the female joint, the lower joint can be correspondingly matched and quickly connected with the male joint, and the tension monitoring short section is connected into a cable quick joint by being connected between the female joint and the male joint to directly, continuously and dynamically monitor the tension condition of a wellhead vertical section cable, so that the monitoring precision can be ensured; and safety guarantee is provided for fishing operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable tension monitoring field, concretely relates to a cable tension monitoring short section for through core fishing and its matched assembly. BACKGROUND

[0002] In the process of logging through drill bit of oilfield production well, once the logging instrument or cable is stuck and cannot be normally unblocked, cable through core fishing operation is usually implemented, drilling tool is connected with fishing tool to go down the well for fishing, the cable needs to be cut at the wellhead and connected with quick connector first, and then the cable is repeatedly connected and disconnected by using the quick connector, so that the cable passes through the center water hole of the drill pipe in sequence and is sent down the well, and the fishing tool captures the stuck instrument and lifts out of the well, the cable needs to be kept suspended to prevent the logging instrument from falling into the well and protect the safety of the logging instrument, especially in the process of sending down the pipe column, the cable winch is used to wind the tension cable, which plays a guiding role in keeping the logging instrument suspended and sending down the pipe column, ensures the fishing effect and improves the fishing efficiency. Because the weak electric tension rod is arranged on the logging swivel connected with the downhole logging instrument, when the cable tension exceeds the rated tension of the weak point tension rod, the weak point tension rod will be pulled off, causing the logging instrument to fall into the well and causing secondary accidents, therefore, the cable tension needs to be dynamically monitored during the through core fishing operation to provide a basis for tension control and ensure the safety of the operation. The wellhead cable usually has two bearing points of the ground pulley and the ground pulley, because the ground pulley is in a high position, the environment is poor, and the tension monitoring equipment is installed on the ground pulley, which is not only difficult to install, but also difficult to ensure the data accuracy, therefore, the monitoring equipment is installed on the ground pulley in actual production, but because the ground pulley has changed the spatial state of the cable and is also affected by the friction between the ground pulley and the ground pulley, the monitoring data obtained cannot accurately reflect the suspension tension of the vertical cable on the logging instrument, thereby reducing the reliability of the safety guarantee of the fishing operation, and the risk of secondary fishing accidents still exists. Therefore, it is necessary to develop a monitoring device that can directly monitor the cable suspension tension for through core fishing operation to solve the problems in the prior art. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a cable tension monitoring short section for through core fishing and its matched assembly, which directly dynamically monitors the cable tension of the vertical cable during through core fishing, ensures the monitoring accuracy, and provides safety guarantee for the fishing operation.

[0004] A cable tension monitoring short section for through-coring fishing, comprising: an upper joint, a lower joint, a tension gauge and a connecting sleeve; the tension gauge is threadedly connected with the axial combination connector of the connecting sleeve and is arranged between the upper joint and the lower joint, so that the axial tensile force between the upper joint and the lower joint can directly act on the tension gauge; a quick connection mechanism corresponding to the female connector structure of a cable quick connection joint is arranged at the upper end of the upper joint, and a quick connection mechanism corresponding to the male connector structure of the cable quick connection joint is arranged at the lower end of the lower joint; the cable tension monitoring short section for through-coring fishing can be connected into the cable quick connection joint through the cooperation between the upper joint and the female connector and the cooperation between the lower joint and the male connector; an aviation plug having signal output and power supply functions is installed on the connecting sleeve, and a wire connection is arranged between the signal output end and the power input end of the tension gauge in the internal cavity of the connecting sleeve; the tension data information output by the tension gauge can be transmitted to the ground control box through the cooperation between the aviation plug and the external wire, so as to dynamically monitor the axial tension of the cable.

[0005] The cable tension monitoring short section for through-coring fishing further comprises: a transmitting antenna, a control circuit and a power battery; the transmitting antenna is fixedly installed on the connecting sleeve, and the control circuit and the power battery are arranged in the internal cavity of the connecting sleeve; the transmitting antenna and the power battery are respectively connected with the control circuit by wires, so that the tension data information of the tension gauge can be converted into wireless signals by the control circuit and transmitted by the transmitting antenna; the wireless signals are monitored, recorded and analyzed by the ground monitoring device to dynamically and continuously monitor the axial tension of the cable; meanwhile, the aviation plug also has a charging input function and can charge the power battery.

[0006] The cable tension monitoring short section for through-coring fishing further comprises: a conversion button; the conversion button is a bidirectional selection switch key and is installed on the connecting sleeve and connected with the control circuit by wires; the control circuit can selectively enter a data wireless transmission mode or a data wired transmission mode by pressing or releasing the conversion button.

[0007] A kind of cable tension monitoring short section matched assembly for through core fishing, it is made of female connector, male connector and tension monitoring short section, wherein the tension monitoring short section is the kind of cable tension monitoring short section for through core fishing;The female connector includes: upper rope cap and upper die sleeve, the upper rope cap is sequentially connected with the upper die sleeve, cable connection system is arranged in the inside of the upper rope cap, the lower part of the upper die sleeve is provided with connector hanging cavity, the lower end surface is provided with cylindrical connector communication groove which is connected with the connector hanging cavity, and the outer circumferential surface of the corresponding area of the connector hanging cavity and the connector communication groove is also provided with connector introduction groove which is connected with the connector hanging cavity and the connector communication groove;The male connector includes: lower die rod and lower rope cap, the lower die rod and the lower rope cap are sequentially connected, connector hanging block is arranged on the upper end of the lower die rod, the structure of the connector hanging block is corresponding with the structure of the connector hanging cavity, connector limiting pin is arranged on the rod body and is equipped with connector sleeve and connector spring, connector limiting slot is opened on the circumferential surface of the connector sleeve, the structure of the connector limiting slot is corresponding with the connector limiting pin and is matched and placed in the connector limiting slot, column defect plane is also arranged on the rod body, so that the lower die rod can be placed into the connector hanging cavity and the connector communication groove through the connector introduction groove, cable connection system is also arranged in the inside of the lower rope cap, the male connector can be connected with the female connector to form the cable quick connection connector;In the tension monitoring short section, the quick connection mechanism on the upper connector and the quick connection mechanism on the lower die rod are completely same in structure, can be matched and connected with the female connector, the connection mechanism on the lower connector and the quick connection mechanism on the upper die sleeve are completely same in structure, can be matched and connected with the male connector, the tension monitoring short section as one of matched assembly can be connected into the cable quick connection connector by the upper connector and the female connector, the lower connector and the male connector.

[0008] The cable tension monitoring short section for through core fishing has the advantages that the cable tension monitoring short section is connected into the cable quick connector by being connected between the female connector and the male connector, the tension condition of the wellhead vertical section cable is directly and continuously dynamically monitored by the cable tension monitoring short section, the monitoring data obtained can directly and accurately reflect the pulling tension generated by the cable in the state of tension suspension logging instrument, the detection data stability is good, the accuracy is high, more reliable safety protection can be provided for fishing operation, more importantly, the cable tension monitoring short section is used in cooperation with the cable quick connector to form a matched assembly, the use method can be effectively simplified, the use efficiency is improved, the detection accuracy is ensured, the cable tension monitoring short section has the functions of both the wired and wireless monitoring modes, the function mode can be flexibly selected according to the process requirement based on the actual well condition and the wellhead environment condition in production and use, the process adaptability is good, the environmental restriction is small, the power consumption is low, the application range is wide, and the cable tension monitoring short section is beneficial to popularization and application in oilfield production and meets the actual production requirement. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structure sectional view of the cable tension monitoring short section for through core fishing.

[0010] Figure 2 It is Figure 1 It is an A-A sectional view.

[0011] Figure 3 It is a left view of the cable tension monitoring short section for through core fishing.

[0012] Figure 4 It is a female connector of the cable quick connector.

[0013] Figure 5 It is a male connector of the cable quick connector.

[0014] Wherein: 1 is an upper connector, 2 is a lower connector, 3 is a tension meter, 4 is a connecting sleeve, 5 is an aviation plug, 6 is a transmitting antenna, 7 is a control circuit, 8 is a power battery, 9 is a conversion button, 10 is a cover plate, 11 is an upper rope cap, 12 is an upper die sleeve, 13 is a lower die rod, 14 is a lower rope cap, 15a is a sliding sleeve, 15b is a connector sliding sleeve, 16a is a spring, 16b is a connector spring, 17a is a suspension cavity, 17b is a connector suspension cavity, 18a is a communication groove, 18b is a connector communication groove, 19a is a guide groove, 19b is a connector guide groove, 20a is a suspension block, 20b is a connector suspension block, 21a is a limiting pin, 21b is a connector limiting pin, 22a is a limiting groove, 22b is a connector limiting groove, and 23 is a three taper sleeve mechanism. DETAILED DESCRIPTION

[0015] The technical scheme of the utility model is described in detail in combination with specific embodiments and drawings.

[0016] A cable tension monitoring short section matched assembly for through core fishing, as shown by the mother joint, the male joint and the tension monitoring short section. Figures 1 to 5 The mother joint is composed of an upper rope cap 11 and an upper die sleeve 12; the upper rope cap 11 and the upper die sleeve 12 are connected in sequence from top to bottom, a three-cone sleeve mechanism 23 is arranged inside the upper rope cap 11, a joint hanging cavity 17b is formed in the lower part of the upper die sleeve 12, the joint hanging cavity 17b is a cylindrical cavity, a cylindrical joint communication groove 18b with a reduced aperture is formed in the lower end face and communicates with the joint hanging cavity 17b, and a joint guide groove 19b is formed in the corresponding region of the outer circumferential face and axially communicates with the joint hanging cavity 17b and the joint communication groove 18b.

[0017] The male joint is composed of a lower die rod 13 and a lower rope cap 14; the lower die rod 13 and the lower rope cap 14 are connected in sequence from top to bottom, a joint hanging block 20b is arranged at the upper end of the lower die rod 13, the joint hanging block 20b is a spherical body corresponding to the structure of the joint hanging cavity 17b, a joint limiting pin 21b is arranged on the rod body and is sleeved with a joint sliding sleeve 15b and a joint spring 16b, a joint limiting groove 22b is formed in the circumferential face of the joint sliding sleeve 15b, the joint limiting groove 22b corresponds to the structure of the joint limiting pin 21b and constitutes an embedded fit, the rod body is symmetrically provided with two columnar flat surfaces parallel to each other on the opposite sides, and the three-cone sleeve mechanism 23 is also arranged inside the lower rope cap 14.

[0018] The male joint is composed of a lower die rod 13 and a lower rope cap 14; the lower die rod 13 and the lower rope cap 14 are connected in sequence from top to bottom, a joint hanging block 20b is arranged at the upper end of the lower die rod 13, the joint hanging block 20b is a spherical body corresponding to the structure of the joint hanging cavity 17b, a joint limiting pin 21b is arranged on the rod body and is sleeved with a joint sliding sleeve 15b and a joint spring 16b, a joint limiting groove 22b is formed in the circumferential face of the joint sliding sleeve 15b, the joint limiting groove 22b corresponds to the structure of the joint limiting pin 21b and constitutes an embedded fit, the rod body is symmetrically provided with two columnar flat surfaces parallel to each other on the opposite sides, and the three-cone sleeve mechanism 23 is also arranged inside the lower rope cap 14.

[0019] The tension monitoring short section is a through fishing cable tension monitoring short section, which is composed of an upper joint 1, a lower joint 2, a tension meter 3, a connecting sleeve 4, an aviation plug 5, a transmitting antenna 6, a control circuit 7, a power battery 8 and a conversion button 9; the upper joint 1, the connecting sleeve 4, the tension meter 3 and the lower joint 2 are sequentially threadedly connected from top to bottom, the upper end of the upper joint 1 is provided with a hanging block 20a, the hanging block 20a is a spherical body corresponding to the structure of the joint hanging cavity 17b, a limiting pin 21a is arranged on the rod body and sleeved with a sliding sleeve 15a and a spring 16a, a limiting groove 22a is formed in the circumferential surface of the sliding sleeve 15a, the limiting groove 22a and the limiting pin 21a correspond to each other in structure and constitute a clamping fit, and the rod body is symmetrically provided with two mutually parallel columnar planes on the opposite sides; the lower part of the lower joint 2 is provided with a hanging cavity 17a, the hanging cavity 17a is a cylindrical cavity corresponding to the structure of the hanging block 20a and the joint hanging block 20b, a cylindrical communication groove 18a with a reduced aperture is formed in the lower end face and communicates with the hanging cavity 17a, and a guide groove 19a is formed in the corresponding area of the outer circumferential surface and axially communicates with the hanging cavity 17a and the communication groove 18a; the connecting sleeve 4 has an internal cavity and is provided with a cover plate 10 which can open the internal cavity, the control circuit 7 and the power battery 8 are fixedly installed in the internal cavity, the aviation plug 5, the transmitting antenna 6 and the conversion button 9 are fixedly installed on the cover plate 10, the aviation plug 5, the transmitting antenna 6, the power battery 8 and the conversion button 9 are respectively connected with the control circuit 7 in line, the aviation plug 5 has signal output, power supply and charging input functions, the transmitting antenna 6 has tension data information wireless transmission function, and the conversion button 9 has tension data information wireless transmission and wired transmission mode conversion function.

[0020] In the process of the through-coring fishing, the cable tension monitoring short section matched assembly is applied, and the specific method is as follows: when the logging instrument or the cable is stuck in the process of logging, the through-coring operation of the cable is first performed, the cable is temporarily fixed by using the C-shaped chuck arranged at the well mouth, the cable is cut off, the male connector is connected to the cable end in the well by using the three taper sleeve mechanism 23, the female connector is connected to the cable end of the winch by using the three taper sleeve mechanism 23, the hanging cavity 17a on the tension monitoring short section is matched and sleeved on the connector hanging block 20b on the male connector, and the tension monitoring short section is limited and connected to the male connector by using the corresponding cooperation between the connector limiting slot 22b on the connector sliding sleeve 15b and the connector limiting pin 21b on the lower die rod 13, the through-coring operation of the fishing tool or the drill pipe is performed in the disconnected state of the cable in the well and the cable of the winch, the cable of the winch passes through the inner hole of the fishing tool or the drill pipe, the hanging cavity 17b on the female connector is matched and sleeved on the hanging block 20a on the tension monitoring short section, and the female connector is limited and connected to the tension monitoring short section by using the corresponding cooperation between the limiting slot 22a on the sliding sleeve 15a and the limiting pin 21a on the upper die sleeve 12, so that the cable of the winch and the cable in the well are connected to each other, and then the C-shaped chuck is removed, the fishing tool or the drill pipe is lowered, the cable needs to be kept in tension state during the lowering process, so that the logging instrument is not dropped into the well, the quick disconnection and quick connection between the female connector and the tension monitoring short section need to be circularly performed during the whole through-coring operation, the fishing tool and the drill pipe are sequentially connected and sent, and the through-coring operation of the logging instrument is completed. During the above fishing operation, the tension data information detected by the tension monitoring short section can directly reflect the tension of the cable under the tension state of the suspended logging instrument, without any calculation and correction, and can be directly used as the evaluation basis of the safety condition in the well, so that the monitoring measure is more accurate and efficient, and the safety guarantee is stable and reliable. After the logging instrument is successfully fished, the reverse through-coring operation of the fishing tool and the drill pipe is performed during the lifting of the fishing tool, the drill pipe and the logging instrument, at this time, the tension monitoring short section is removed from the male connector, the fishing tool and the drill pipe are sequentially disconnected by using the quick connection and quick disconnection between the female connector and the male connector, the cable of the winch is pulled out of the fishing tool and the drill pipe, and the whole through-coring fishing work is completed.

Claims

1. A through-tubing wireline tension monitoring sub, characterized by, Include: The upper joint (1), lower joint (2), tension meter (3) and connecting sleeve (4); the axial combination of the tension meter (3) and the connecting sleeve (4) is connected with screw thread, and is arranged between the upper joint (1) and the lower joint (2), a quick connection mechanism corresponding to the female connector structure of the cable quick connection connector is arranged at the upper end of the upper joint (1), and a quick connection mechanism corresponding to the male connector structure of the cable quick connection connector is arranged at the lower end of the lower joint (2), the upper joint (1) and the female connector, the lower joint (2) and the male connector are connected, and the cable quick connection connector can be connected; the aviation plug (5) is installed on the connecting sleeve (4), the aviation plug (5) has signal output and power supply function, a line connection is arranged between the signal output end and the power input end of the tension meter (3) in the internal cavity of the connecting sleeve (4), and the tension data information output by the tension meter (3) can be transmitted to the ground control box through the aviation plug (5) connected with the external lead.

2. A through-casing fishing cable tension monitoring sub as claimed in claim 1, characterised in that, Also include: The transmitting antenna (6), control circuit (7) and power battery (8), the transmitting antenna (6) is fixedly installed on the connecting sleeve (4), the control circuit (7) and the power battery (8) are arranged and installed in the internal cavity of the connecting sleeve (4), the transmitting antenna (6) and the power battery (8) are respectively connected with the control circuit (7) by a line, the tension data information monitored by the tension meter (3) can be converted into wireless signal by the control circuit (7) and transmitted wirelessly by the transmitting antenna (6), and simultaneously, the aviation plug (5) also has a charging input function.

3. A through-casing fishing cable tension monitoring sub as claimed in claim 2, characterised in that, Further include: conversion button (9), the conversion button (9) is a bidirectional selection switch key, installed on the connecting sleeve (4) and connected with the control circuit (7), pressing or releasing the conversion button (9) can make the control circuit (7) selectively enter the data wireless transmission mode or the data wired transmission mode.

4. A through-tubing cable tension monitoring sub assembly, characterized in that: The cable tension monitoring short section for fishing through the center is composed of a female joint, a male joint and a tension monitoring short section, wherein the tension monitoring short section is the cable tension monitoring short section for fishing through the center as claimed in any one of claims 1 to 3; the female joint comprises an upper rope cap (11) and an upper die sleeve (12), which are connected in sequence from top to bottom, a cable connection system is arranged inside the upper rope cap (11), a joint hanging cavity (17b) is formed in the lower part of the upper die sleeve (12), a cylindrical joint communication groove (18b) is formed in the lower end face and communicates with the joint hanging cavity (17b), a joint guide groove (19b) is further formed in the outer circumferential surface of the corresponding area of the joint hanging cavity (17b) and the joint communication groove (18b) and communicates with the joint hanging cavity (17b) and the joint communication groove (18b); the male joint comprises a lower die rod (13) and a lower rope cap (14), which are connected in sequence from top to bottom, a joint hanging block (20b) is arranged on the upper end of the lower die rod (13), the structure of the joint hanging block (20b) corresponds to that of the joint hanging cavity (17b), a joint limiting pin (21b) is arranged on the rod body and is sleeved with a joint sliding sleeve (15b) and a joint spring (16b), a joint limiting groove (22b) is formed in the circumferential surface of the joint sliding sleeve (15b), the structure of the joint limiting groove (22b) corresponds to that of the joint limiting pin (21b) and the joint limiting pin (21b) is fitted and arranged in the joint limiting groove (22b), a column defect plane is further arranged on the rod body, a cable connection system is also arranged inside the lower rope cap (14), the male joint can be connected with the female joint in correspondence to form the quick connection joint of the cable; in the tension monitoring short section, the quick connection mechanism on the upper joint (1) is completely identical in structure with the quick connection mechanism on the lower die rod (13) and can be quickly connected with the female joint in correspondence, the connection mechanism on the lower joint (2) is completely identical in structure with the quick connection mechanism on the upper die sleeve (12) and can be quickly connected with the male joint in correspondence.

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