CN216043681U

CN216043681U - Double-freedom-degree resistance reduction protection device for underground cable

Info

Publication number: CN216043681U
Application number: CN202122556157.0U
Authority: CN
Inventors: 王晓强; 邵勇; 冷亚育; 周丛林; 安轶文; 武建军; 顾鹏程; 刘胜春; 郭双生; 周艳; 于慧君; 付政委; 赵萍; 刘盈杉; 周春阳; 刘警卫
Original assignee: Xi'an Tianqing Lido Technology Co ltd
Current assignee: Xi'an Tianqing Lido Technology Co ltd
Priority date: 2021-10-24
Filing date: 2021-10-24
Publication date: 2022-03-15
Anticipated expiration: 2031-10-24

Abstract

A double-freedom-degree drag reduction protection device for an underground cable comprises a protection sleeve, a locking taper sleeve, a locking press cap, a rotary sleeve, a spherical flywheel and a deep groove bearing, wherein the protection sleeve, the locking taper sleeve, the locking press cap and the rotary sleeve are of split structures, the protection sleeve is sleeved on the underground cable and is matched and fixed by the locking taper sleeve and the locking press cap, a rotary sleeve limiting sleeve is arranged on the protection sleeve, the spherical flywheel is arranged on the rotary sleeve and is supported on a well wall in a well logging process so as to greatly reduce the friction strength of the underground cable, protect the underground cable and prolong the service life, meanwhile, the double-freedom-degree guide function is provided, the second freedom degree of self rotation can adapt to and guide the axial direction movement of the underground cable, the first freedom degree rotating along with the whole rotary sleeve can adapt to the well wall structure, the radial displacement of the underground cable is guided to bypass the obstruction, and the smooth operation of the underground cable in the axial direction is kept, the friction resistance is reduced, and the logging operation efficiency and the parameter measurement precision are improved.

Description

Double-freedom-degree resistance reduction protection device for underground cable

Technical Field

The utility model relates to a cable resistance-reducing protection device, in particular to a double-freedom-degree resistance-reducing protection device for an underground cable.

Background

Along with the increasing development difficulty of petroleum resources and the increasing of petroleum drilling and production technologies, the requirements on oil field well logging technologies, particularly horizontal well downhole well logging, are higher and higher, and higher well logging efficiency and measurement precision are not only the requirements on quality improvement and consumption reduction of oil field production, but also the requirements on timely troubleshooting of hidden danger and safe production, because the existing horizontal well logging adopts an operation mode that crawlers drive instrument strings to do crawling motion, in the well logging process, a downhole cable is frequently rubbed or blocked with a well wall when being sent or lifted, particularly the friction strength between the downhole cable and the well wall is increased when a horizontal well section works, the friction resistance is increased sharply, the friction damage and even damage of the downhole cable are easily caused, the service life of the downhole cable is shortened or the use function of the downhole cable is damaged, the production waste is caused, the production cost is increased, and the sharply increased friction resistance or the cross blockage of a complex well wall structure is caused, the crawling tension of the crawler can be increased, the crawling speed is reduced or the crawling distance is blocked, the logging working efficiency and the parameter measurement precision are affected, sometimes, the crawler can be restarted or logging operation is continued smoothly, logging operation accidents are caused, and oil field production is affected. Therefore, aiming at the problems in the prior art, it is necessary to research and develop a guiding and protecting device for an underground cable in the well logging process, so that the service life of the underground cable is prolonged, the stability and controllability of the movement of a well logging instrument string under the full working condition are ensured, and the well logging operation efficiency and the parameter measurement precision are improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a resistance reduction protection device for an underground cable, which adopts a spherical wheel structure with two degrees of freedom and improves the high efficiency of underground cable transmission and guidance and the reliability of transmission protection.

A double-freedom-degree drag reduction protection device for a downhole cable is assembled and installed on the downhole cable and comprises: the device comprises a protective sleeve, a locking taper sleeve, a locking pressing cap, a rotary sleeve, a spherical flywheel and a deep groove bearing; the protective sheath locking taper sleeve locking press cap with the swivel mount is the components of a whole that can function independently run from opposite directions structure, runs from opposite directions the components of a whole that can function independently and corresponds the combination respectively and constitute the cover body, wherein: the protective sleeve, the locking pressing cap and the rotating sleeve are connected by a connecting screw to form a fixed sleeve body; the protective sleeve is sleeved on the underground cable in a matching mode, the upper end and the lower end of the protective sleeve are respectively provided with an internal diameter increasing thread, the bottom of the diameter increasing area is respectively provided with a conical inner annular surface, the outer side of the locking taper sleeve is a conical outer annular surface, the conical outer annular surface and the conical inner annular surface arranged on the protective sleeve have the same taper angle, 2 locking taper sleeves are respectively sleeved on the underground cable and are respectively embedded between the underground cable and the protective sleeve from the two ends of the protective sleeve along the corresponding direction of the conical outer annular surface and the conical inner annular surface, so that the conical outer annular surface and the conical inner annular surface are respectively correspondingly matched, the locking press cap is provided with a reducing external thread which is in structural matching with the internal diameter increasing thread arranged on the protective sleeve, and 2 locking press caps are respectively sleeved on the underground cable and are in threaded connection with the two ends of the protective sleeve, the front end face of the locking pressing cap abuts against the tail end face of the locking taper sleeve to push the locking taper sleeve to move forwards, and 2 split bodies forming the locking taper sleeve are radially locked on the underground cable through the interaction of the conical outer ring surface and the conical inner ring surface, so that the protective sleeve is fixed on the underground cable; the rotary sleeve limiting sleeve is arranged on the protective sleeve and can axially rotate relative to the protective sleeve, 2 mutually symmetrical convex shaft bodies are arranged on an outer cylindrical surface of the rotary sleeve along the radial direction, the spherical flywheel is in a spherical segment shape with a circular spherical surface, the deep groove bearing is embedded in an inner cavity, the spherical surfaces of the 2 spherical flywheels face towards the outside, and the 2 spherical flywheels are respectively connected to the convex shaft bodies through the deep groove bearing, so that the 2 spherical flywheels can rotate relative to the rotary sleeve by taking the convex shaft bodies as axes, and further, not only is the 2 spherical flywheels integrally provided with a first rotational freedom degree rotating along the central axis of the underground cable relative to the underground cable, but also each spherical flywheel is provided with a second rotational freedom degree rotating along the central axis of the convex shaft body relative to the underground cable.

The double-degree-of-freedom drag reduction protection device for the underground cable further comprises: the flywheel protection ring is also of a split structure, 2 split parts are fixedly connected to the protection sleeve through bolts and combined to form a circular ring body, and sharp edges at the upper end and the lower end of each spherical flywheel are covered and shielded in an inner ring hole of the circular ring body, so that the phenomenon that the edge of the spherical flywheel is deformed or damaged possibly caused by strong friction and impact of a well wall in the motion direction to influence the motion state of the spherical flywheel in the direction of the second rotational degree of freedom is prevented.

The double-freedom-degree resistance reduction protection device for the underground cable is characterized in that in order to reduce the friction resistance of the rotary sleeve relative to the rotation of the protective sleeve and improve the smoothness of the rotary sleeve relative to the movement of the protective sleeve, a steel ball group is preferably arranged on a contact surface between the rotary sleeve and the protective sleeve and consists of a plurality of steel balls and is embedded in a circular closed track formed by combining the rotary sleeve and a semicircular track groove formed in the protective sleeve, and a point contact rolling friction state is formed between the rotary sleeve and the contact surface of the protective sleeve.

Further, a two degree of freedom drag reduction protection device in cable in pit is preferred be provided with the fastening swizzle on the protective sheath, the fastening swizzle is installed in the screw hole that link up of seting up on the protective sheath lateral wall, the fastening swizzle precession can support the top with protective sheath threaded connection on the locking pressure cap, further strengthen the compression cap with connection steadiness between the protective sheath prevents that strong impact and the vibration of the relative wall of a well under operating condition can lead to the locking pressure cap with screw thread between the protective sheath is not hard up, reduces the locking taper sleeve is right the locking intensity of cable in pit.

Furthermore, according to the underground cable two-degree-of-freedom drag reduction protection device, preferably, the locking pressing cap is provided with a process operation hole for assisting in mounting, fastening or dismounting and loosening the locking pressing cap, so that the labor intensity of combined mounting is reduced, and the working efficiency of assembling operation is improved.

The utility model has the advantages that the utility model provides the underground cable resistance reduction protection device, which adopts the spherical flywheel structure with two degrees of freedom, in the process of logging operation, the spherical flywheel supports and acts on the well wall, the direct contact between the underground cable and the well wall is avoided or reduced, the friction force of the underground cable can be greatly reduced, the underground cable is protected, the service life is prolonged, meanwhile, in the two-degree-of-freedom guiding function of the spherical flywheel, the second degree of freedom of self rotation can adapt and guide the axial motion of the underground cable, when the axial direction encounters a larger motion obstruction, the first degree of freedom rotating along with the rotating sleeve can adapt to the well wall structure, the radial direction of the underground cable is guided to generate displacement, the obstruction in the axial direction is bypassed, the smooth running of the underground cable in the axial direction is kept, and the adverse effect of the underground working condition on the logging operation and the logging result is solved, the efficiency of cable conveying guide's in the pit reliability of conveying protection is improved, guarantee the stability and the controllability that the logging instrument cluster removed in the pit under the full operating mode condition, improve logging operation efficiency and parameter measurement accuracy.

Drawings

FIG. 1 is a front view of a two-degree-of-freedom drag reduction protection device for a downhole cable.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a main sectional view of a downhole cable two-degree-of-freedom guiding fairing.

Fig. 4 is a sectional view taken along line B-B of fig. 3.

Fig. 5 is a cross-sectional view taken along line C-C of fig. 3.

Detailed Description

The technical solution claimed by the present invention is further described below with reference to the specific embodiments and the accompanying drawings.

A double-freedom-degree drag reduction protection device for an underground cable suitable for oil field logging operation is shown in figures 1 and 3, is assembled and installed on an underground cable 10 and comprises a protection sleeve 1, a locking taper sleeve 2, a locking pressing cap 3, a rotary sleeve 4, a spherical flywheel 5, a deep groove bearing 6, a flywheel protection ring 7 and a steel ball group 9.

The protective sheath 1 the locking taper sleeve 2 the locking is pressed the cap 3 the swivel sleeve 4 with flywheel protection ring 7 is the components of a whole that can function independently run from opposite directions structure, runs from opposite directions the components of a whole that can function independently and corresponds the combination respectively and constitute the cover body, wherein: the protective sleeve 1, the locking pressing cap 3 and the rotating sleeve 4 are connected by a connecting screw 12 to form a fixed sleeve body, as shown in fig. 1, 2 and 3, a positioning pin 14 is respectively arranged on the connecting surface of each fixed sleeve body to improve the accuracy of the corresponding connection of the split bodies; the protective sleeve 1 is sleeved on the underground cable 10 in a matching manner, the upper end and the lower end of the protective sleeve are respectively provided with an internal diameter increasing thread, the bottom of a diameter increasing area is respectively provided with a conical inner annular surface, the outer side of the locking taper sleeve 2 is a conical outer annular surface, 2 locking taper sleeves 2 are respectively sleeved on the underground cable 10 and are respectively embedded between the underground cable 10 and the protective sleeve 1 from the two ends of the protective sleeve 1, so that the conical outer annular surface arranged on the locking taper sleeve 2 and the conical inner annular surface arranged on the protective sleeve 1 are respectively correspondingly matched, one end of each locking press cap 3 is provided with a reducing external thread, the side wall of each locking press cap is radially and symmetrically provided with 2

process operation holes

11, 2 locking press caps 3 are respectively sleeved on the underground cable 10 and are in threaded connection with the two ends of the

protective sleeve

1, and 2 fastening screw pins 8 are radially and symmetrically arranged on the protective sleeve 1, as shown in fig. 5, the fastening screw 8 is installed in a through threaded hole formed in the side wall of the protective sleeve 1, and is screwed in to abut against the locking pressing cap 3 in threaded connection with the protective sleeve 1, so as to further enhance the connection stability between the locking pressing cap 3 and the protective sleeve 1; the rotary sleeve 4 is sleeved on the protective sleeve 1, two ends of the rotary sleeve are limited by annular bosses arranged on the protective sleeve 1, a steel ball group 9 is arranged on a contact surface between the rotary sleeve 4 and the

protective sleeve

1, 2 mutually symmetrical outer convex shaft bodies are arranged on an outer cylindrical surface of the rotary sleeve 4 along the radial direction, as shown in figures 3 and 4, the deep groove bearing 6 is limited and embedded in an inner cavity of the spherical flywheel 5 by an elastic retainer ring, the deep groove bearing 6 is connected on the outer convex shaft body by a bearing press ring 13, so that 2 spherical flywheels 5 can rotate relative to the rotary sleeve 4 by taking the outer convex shaft bodies as axes, a process operation window corresponding to the mounting position of the bearing press ring 13 is arranged on the spherical surface of the spherical flywheel 5 for implementing the dismounting process operation of the bearing press ring 13, and the spherical flywheel is closed by a protective screw 15 under the working state, maintaining the tool environment of the deep groove bearing 6; 2 split parts of the flywheel protection ring 7 are respectively fixedly connected to the protection sleeve 1 by fixing screws 16 and combined to form a circular ring body, and as shown in fig. 3, the upper end edge and the lower end edge of 2 spherical flywheels 5 are covered and shielded in the inner ring hole of the circular ring body.

The underground cable two-degree-of-freedom drag reduction protection device is used in the underground logging production activity of an oil field, a plurality of sets of underground cable two-degree-of-freedom guiding protection devices are installed on an underground cable at certain intervals, and the specific installation steps are as follows: firstly, taking a positioning pin 14 on a split body of a protective sleeve body 1 as a reference, sleeving the protective sleeve 1 on a downhole cable 10 in a combined manner and connecting the positioning pin 14 with a connecting screw 12 to form a fixed sleeve body, then embedding a locking taper sleeve 2 formed by combining the split bodies between the downhole cable 10 and the protective sleeve 1 from two ends of the protective sleeve 1, sleeving 2 locking pressing caps 3 on the downhole cable 10 in areas of two ends of the protective sleeve 1 in a combined manner and connecting the locking pressing caps 3 to form the fixed sleeve body respectively by taking the positioning pin as the reference, screwing the locking pressing caps 3 at two ends of the protective sleeve 1 respectively, sufficiently screwing the locking pressing caps 3 by virtue of a process operation hole 11 and an auxiliary tool to ensure that the locking taper sleeve 2 is sufficiently locked on the downhole cable 10, and then screwing 2 fastening screw pins 8 alternately to further lock the locking pressing caps 3, fixedly mounting the protective casing 1 on the downhole cable 10; then, after a steel ball group 9 is placed in a semicircular track groove formed in a rotary sleeve 4, the rotary sleeve 4 is combined and sleeved on a limiting area of the protective sleeve 1 by taking a positioning pin as a reference and connected to form a fixed sleeve body, a deep groove bearing 6 and a bearing press ring 13 are respectively matched and embedded in inner cavities of 2 spherical flywheels 5 and are limited and fixed by an elastic retainer ring, then the deep groove bearing 6 is respectively sleeved on an outer convex shaft body on the rotary sleeve 4, the bearing press ring 13 is screwed and fixed on the outer convex shaft body through a process operation window formed in the spherical flywheel 5, so that the spherical flywheel 5 is connected and installed on the rotary sleeve 4, and then a protection screw 15 is covered and installed on the process operation window and is further reinforced by the elastic retainer ring; finally, 2 flywheel protection rings 7 are respectively and fixedly installed at corresponding positions of the protective sleeve 1 by using fixing screws 16, and the installation of the underground cable two-degree-of-freedom guiding protection device is completed. In the process of carrying out logging operation in a delivery well, due to the supporting effect of the spherical flywheel 5, the direct contact between the underground cable 10 and the well wall is avoided or reduced, so that the friction strength between the underground cable 10 and the well wall can be greatly reduced, the underground cable 10 is effectively protected, the service life is prolonged, and more importantly: the spherical flywheel 5 has a guiding function with two degrees of freedom, the second degree of freedom of rotation of the spherical flywheel 5 can adapt to and guide the movement of the underground cable 10 in the axis direction to a certain degree, and when the spherical flywheel 5 encounters a large movement obstruction in the axis direction, the spherical flywheel 5 can adapt to a well wall structure along with the first degree of freedom of the overall rotation of the rotary sleeve 4, guide the underground cable 10 to generate displacement in the radial direction, bypass the movement obstruction encountered in the axis direction, keep the underground cable 10 to smoothly move in the axis direction, solve the adverse effect of the underground working condition on the logging operation and the logging result, ensure the stability and controllability of the logging instrument string moving in the underground under the full working condition, and improve the logging operation efficiency and parameter measurement precision.

Claims

1. The utility model provides a two degree of freedom drag reduction protection device of cable in pit, the combination is installed on cable (10) in the pit, its characterized in that includes: the device comprises a protective sleeve (1), a locking taper sleeve (2), a locking pressing cap (3), a rotary sleeve (4), a spherical flywheel (5) and a deep groove bearing (6); protective sheath (1) locking taper sleeve (2) locking press cap (3) with swivel sleeve (4) are the components of a whole that can function independently and run from opposite directions the structure, run from opposite directions the components of a whole that can function independently and correspond the combination respectively and constitute the cover body, wherein: the protective sleeve (1), the locking pressing cap (3) and the rotating sleeve (4) are connected by a connecting screw (12) to form a fixed sleeve body; the protective sleeve (1) is sleeved on the underground cable (10) in a matching mode, the upper end and the lower end of the protective sleeve are respectively provided with an internal diameter increasing thread, the bottom of a diameter increasing area is respectively provided with a conical inner annular surface, the outer side of the locking taper sleeve (2) is a conical outer annular surface, the conical outer annular surface and the conical inner annular surface arranged on the protective sleeve (1) have the same taper angle, 2 locking taper sleeves (2) are respectively sleeved on the underground cable (10) and are respectively embedded between the underground cable (10) and the protective sleeve (1) from the two ends of the protective sleeve (1) along the corresponding direction of the conical outer annular surface and the conical inner annular surface, so that the conical outer annular surface and the conical inner annular surface are respectively in corresponding matching, the locking press cap (3) is provided with an external diameter reducing thread, and the external diameter increasing thread arranged on the protective sleeve (1) are in structural matching, the 2 locking pressing caps (3) are respectively sleeved on the underground cable (10) and are in threaded connection with two ends of the protective sleeve (1), the front end face of each locking pressing cap (3) abuts against the end face of the tail part of the corresponding locking taper sleeve (2) to push the corresponding locking taper sleeve (2) to move forwards, and the 2 split bodies forming the corresponding locking taper sleeves (2) are radially locked on the underground cable (10) through interaction of the conical outer ring face and the conical inner ring face; the rotary sleeve (4) is sleeved on the protective sleeve (1) in a limiting manner and can rotate axially relative to the protective sleeve (1), 2 mutually symmetrical outer convex shaft bodies are arranged on the outer cylindrical surface of the rotary sleeve (4) along the radial direction, the spherical flywheel (5) is in a spherical segment shape with a circular spherical surface, the deep groove bearing (6) is embedded in an inner cavity, the spherical surface of each spherical flywheel (5) faces outwards, the spherical surface of each spherical flywheel (5) is connected to the outer convex shaft body through the deep groove bearing (6), and the 2 spherical flywheels (5) can rotate relative to the rotary sleeve (4) by taking the outer convex shaft body as an axis.

2. The two-degree-of-freedom drag reduction protection device for a downhole cable of claim 1, further comprising: flywheel protection ring (7), flywheel protection ring (7) are the components of a whole that can function independently run from opposite directions structure, and 2 run from opposite directions components of a whole that can function independently utilize fixing bolt (16) fixed connection respectively on protective sheath (1) and make up and constitute circular ring body, cover 2 the sharp-pointed border at both ends covers about spherical flywheel (5) and shields in the interior annular ring of circular ring body.

3. The two-degree-of-freedom drag reduction protection device for a downhole cable according to claim 1 or 2, wherein: the steel ball group (9) is arranged on a contact surface between the rotating sleeve (4) and the protective sleeve (1), the steel ball group (9) is composed of a plurality of steel balls and is embedded in a circular closed track formed by combining the rotating sleeve (4) and a semicircular track groove formed in the protective sleeve (1).

4. The two-degree-of-freedom drag reduction protection device for a downhole cable according to claim 3, wherein: the protective sleeve is characterized in that a fastening screw pin (8) is arranged on the protective sleeve (1), the fastening screw pin (8) is installed in a through threaded hole formed in the side wall of the protective sleeve (1), and the fastening screw pin (8) is screwed in and can be abutted to the locking pressing cap (3) in threaded connection with the protective sleeve (1).

5. The two-degree-of-freedom drag reduction protection device for a downhole cable according to claim 4, wherein: the locking pressing cap (3) is provided with a process operation hole (11).