Upwarp well reverse sliding prevention device and method for underground tractor

By designing an upward well anti-sliding device for downhole traction, and using the combination of support arms and reset devices, the problem of reverse downward slipping caused by the weight of the downhole traction during upwelling well construction is solved, safe fixation of the instrument and anti-deformation of the cable, ensuring the normal progress of the well log and the safe lifting of the instrument.

CN120026845APending Publication Date: 2025-05-23CHINA NAT PETROLEUM CORP +1
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Patent Information

Application Number
CN202311577168.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-11-23
Publication Date
2025-05-23

AI Technical Summary

Technical Problem

When the downhole traction device is constructed in an upturn well, the instrument may slip backward due to the weight of the regularizer, and the cable may be squeezed and wound and deformed, resulting in logging failure or instrument falling.

Method used

A device for anti-sliding inverted well for downhole traction is designed, including a support arm device and a reset device. The arm support device consists of a secondary arm and a main arm, and the reset device consists of a reset rod, a transmission disc, a support arm return spring and a pull rod return spring. The device uses gravity to shrink the support arm when the instrument is down the well to fix the instrument; after reaching the target layer, it forms a reverse self-locking through the reset device to prevent slipping down; when lifting up, the support arm is pulled by a cable to lift the instrument smoothly.

Benefits of technology

It effectively prevents the instrument from slipping downward due to the weight of the straightening device during upturn well construction, avoids the risk of cable deformation and instrument falling, and ensures the normal progress of well logging and the safe lifting of the instrument.

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Abstract

The invention discloses an upwarp well reverse sliding prevention device and method for an underground tractor, and belongs to the technical field of oil well logging. By arranging the support arm device and the reset device, the main support arm can be shrunk through gravity when the instrument descends into a well, and meanwhile, the auxiliary support arm is driven to be shrunk, so that the instrument can normally descend into the well. Meanwhile, after reaching the target layer of the upwarp well, the support arm can be supported by the spring, reverse self-locking is formed in the sleeve, and the instrument is effectively fixed. When the instrument is lifted, the upper connector, the pull rod and the transmission disc are driven through the pulling force of the cable, and finally self-locking of the support arm is unlocked, so that the auxiliary support arm drives the main support arm to retract.
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Description

Technical Field

[0001] The invention belongs to the technical field of petroleum well logging, and in particular relates to an anti-slip device and method for an upturned well used for a downhole tractor. Background Art

[0002] At present, when the downhole tractor is used for construction in horizontal wells, the downhole tractor crawls in the casing, and the upward angle of the horizontal well becomes larger and larger, which can reach more than 10°. The downhole tractor drags and pushes the instrument uphill, and the cable is in a relaxed state at this time. The downhole tractor stops working after the instrument reaches the target layer. At this time, the downhole tractor and the instrument are supported on the inner wall of the casing by the centralizer. The centralizer is a roller structure, which will cause the instrument string to slide down in the opposite direction under its own weight. The downward sliding process at the bridle will squeeze and entangle the cable and cause deformation. First, the cable may be squeezed and damaged, resulting in the insulation value between the cable core and the outer skin returning to zero and making it impossible to log wells. Second, the breaking force value is reduced after the cable is deformed, and there is a risk of breaking and causing the instrument to fall into the well. Summary of the invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a device and method for preventing reverse sliding of a downhole tractor, which is used to solve the problem that the existing downhole tractor relies on a stabilizer for support during use and is prone to reverse sliding.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention discloses an anti-slip device for an upturned well for a downhole tractor, comprising an upper joint, an outer shell, a pull rod, an arm device, and a reset device; the upper joint is connected to one end of the pull rod; the other end of the pull rod is connected to the outer shell; one end of the arm device is connected to a pin of the outer shell; the other end of the arm device is connected to a pin of the reset device; and the reset device is fitted with the pull rod.

[0006] Furthermore, the reset device comprises two reset rods, a transmission plate, a support arm reset spring and a pull rod reset spring; the pull rod is arranged between the two reset rods; the transmission plate is arranged between the two reset rods and fits with the pull rod; one end of the two reset rods is respectively connected to the other end pin of the support arm device;

[0007] The pull rod return spring is wound on the pull rod, one end of which is connected to one side of the transmission disc, and the other end of which is connected to the housing;

[0008] The support arm reset spring is wound on the pull rod, one end of the support arm reset spring is connected to the other end of the reset rod, and the other end is connected to the connection between the upper joint and the pull rod.

[0009] Furthermore, the pull rod is arranged at the center position of the two reset rods.

[0010] Further, the arm device comprises two mutually connected auxiliary arms and a main arm; the auxiliary arm and the main arm are connected by a pin;

[0011] One end of the auxiliary arm is pin-connected with one end of the reset rod; the other end of the auxiliary arm is pin-connected with one end of the main arm; and the other end of the main arm is pin-connected with the outer shell.

[0012] Furthermore, the pin connections are all achieved by using connecting pin shafts.

[0013] Furthermore, the upper joint is connected to one end of the pull rod via a pull rod pin; a connecting ring is provided between the upper joint and the pull rod pin.

[0014] Furthermore, the arm reset spring is wound around the pull rod, one end of which is connected to the other end of the reset rod, and the other end is connected to the pull rod pin.

[0015] Furthermore, the upper connector is connected to the logging cable connecting bridle; and the outer shell is connected to the instrument string.

[0016] The present invention also discloses a method for using the above device, comprising the following steps:

[0017] When the shell crawls upward, the shell drives the arm device to retract, so that the whole device can be lifted smoothly; when the target layer of the upturned well is reached, the arm device is supported by the reset device, so that the arm device forms a reverse self-locking in the casing to fix the instrument.

[0018] Further, the reset device comprises two reset rods, a transmission plate, a support arm reset spring and a pull rod reset spring; the reset device comprises two auxiliary support arms and a main support arm connected to each other;

[0019] When the shell crawls upward, the shell drives the main arm to move upward, and the bridle connected to the logging cable drives the upper joint to remain unchanged. At this time, the main arm and the reset rod produce relative displacement, driving the pull rod and the rotating disk, the arm reset spring and the pull rod reset spring are compressed, and the auxiliary arm is pulled to retract the main arm into the shell, so that the whole device can be lifted smoothly;

[0020] When reaching the target layer of the upturned well, the reset device supports the auxiliary arm and the main arm, forming a reverse self-locking in the casing to fix the instrument.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention discloses an anti-slip device for an upturned well for a downhole tractor. By providing an arm device and a reset device, the arm device can be driven to retract when the instrument is lowered into the well, so that the instrument can be lowered into the well normally. At the same time, after reaching the target layer of the upturned well, the arm device can be supported by the reset device to form a reverse self-locking in the casing, effectively fixing the instrument. When the instrument is lifted, the pulling force of the cable drives the upper joint, the pull rod and the reset device, and finally unlocks the self-locking, and is lifted smoothly.

[0023] Furthermore, the arm device is composed of a secondary arm and a main arm, and the reset device is composed of a reset rod, a transmission disc, an arm reset spring and a pull rod reset spring. When the instrument is lowered into the well, the main arm can be retracted by gravity, and the secondary arm can be retracted at the same time, so that the instrument can be lowered into the well normally. At the same time, after reaching the target layer of the upturned well, the arm can be supported by the spring to form a reverse self-locking in the casing to effectively fix the instrument. When the instrument is lifted up, the pulling force of the cable drives the upper joint, and at the same time drives the pull rod and the transmission disc, and finally unlocks the arm self-locking, so that the secondary arm drives the main arm to retract. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the upturned well anti-slip device for a downhole tractor of the present invention;

[0025] Figure 2 It is a schematic diagram of the arm-opening state of the upturned well anti-slip device for the downhole tractor of the present invention;

[0026] Figure 3 It is a schematic diagram of the arm retracting state of the upturned well anti-slip device for the downhole tractor of the present invention.

[0027] Among them: 1-upper joint; 2-connecting ring; 3-pull rod pin; 4-support arm reset spring; 5-reset rod; 6-transmission plate; 7-connecting pin; 8-auxiliary support arm; 9-main support arm; 10-housing; 11-pull rod; 12-pull rod reset spring; a-main view; b-45° view. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0031] like Figure 1 As shown, the present invention discloses an anti-slip device for an upturned well for a downhole tractor, which mainly comprises an upper joint 1, a shell 10, a pull rod 11, an arm device, and a reset device; wherein the arm device is composed of two mutually connected auxiliary arms 8 and a main arm 9; the reset device is composed of two reset rods 5, a transmission plate 6, an arm reset spring 4 and a pull rod reset spring 12; the logging cable is connected to a bridle and connected to the upper joint 1, and the instrument string is connected to the shell 10.

[0032] The upper joint 1 is connected to the pull rod 11 through the pull rod pin 3, and the pull rod 11 is fitted with the reset rod 5 through the transmission plate 6; the auxiliary arm 8 is connected to the reset rod 5 through the connecting pin 7, the auxiliary arm 8 is connected to the main arm 9 through the connecting pin 7, and the main arm 9 is connected to the housing 10 through the connecting pin 7;

[0033] The pull rod return spring 12 is wound around the pull rod 11, one end of which is connected to one side of the transmission plate 6, and the other end of which is connected to the housing 10;

[0034] The arm reset spring 4 is wound around the pull rod 11 , one end of which is connected to the other end of the reset rod 5 , and the other end of which is connected to the pull rod pin 3 .

[0035] When the above device is used, when the shell 10 crawls upward, the shell 10 drives the arm device to retract, thereby realizing the smooth lifting of the entire device; when the target layer of the upturned well is reached, the arm device is supported by the reset device, so that the arm device forms a reverse self-locking in the casing to fix the instrument.

[0036] Furthermore, when the housing 10 crawls upward, the housing 10 drives the main arm 9 to move upward, and the bridle connected to the logging cable drives the upper joint 1 to remain stationary. At this time, the main arm 9 and the reset rod 5 produce relative displacement, driving the pull rod 11 and the rotating disk 6, the arm reset spring 4 and the pull rod reset spring 12 to compress, and pull the secondary arm 8 to retract the main arm 9 into the housing, so as to achieve smooth lifting of the entire device;

[0037] When reaching the target layer of the upwelling well, the resetting device supports the auxiliary arm 8 and the main arm 9, forming a reverse self-locking in the casing to fix the instrument.

[0038] The present invention adopts a spring and arm device. The arm is kept open in the normal state. When the instrument is lowered or crawling, the arm is contracted by the instrument's own gravity or crawling driving force, so that it slides inside the casing. When the instrument stops, the spring supports the arm, forms a reverse support force on the inner wall of the casing and self-locks to prevent the instrument from sliding down. When the instrument is lifted, the cable generates a pulling force, the compression spring releases the self-locking, the arm is retracted, and the instrument is lifted normally.

[0039] When the instrument is lowered into the well, the main arm of the device can be retracted by gravity, and the secondary arm can be retracted at the same time, so that the instrument can be lowered into the well normally. At the same time, after reaching the target layer of the upturned well, the arm can be supported by the spring to form a reverse self-locking in the casing to effectively fix the instrument. When the instrument is lifted up, the pulling force of the cable drives the upper joint, the pull rod and the transmission disc, and finally unlocks the arm self-locking, so that the secondary arm drives the main arm to retract and is lifted up smoothly.

[0040] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A device for preventing slipping back in a well with an upturned well for a downhole tractor. It is characterized in that It comprises an upper joint (1), an outer shell (10), a pull rod (11), an arm device and a reset device; the upper joint (1) is connected to one end of the pull rod (11); the other end of the pull rod (11) is connected to the outer shell (10); one end of the arm device is connected to a pin of the outer shell (10); the other end of the arm device is connected to a pin of the reset device; the reset device is fitted with the pull rod (11).

2. The anti-slip device for an upturned well for a downhole tractor according to claim 1, It is characterized in that The reset device comprises two reset rods (5), a transmission plate (6), an arm reset spring (4) and a pull rod reset spring (12); the pull rod (11) is arranged between the two reset rods (5); the transmission plate (6) is arranged between the two reset rods (5) and is in contact with the pull rod (11); one end of the two reset rods (5) is respectively connected to the other end pin of the arm device; The pull rod return spring (12) is wound around the pull rod (11), one end of which is connected to one side of the transmission plate (6), and the other end of which is connected to the housing (10); The arm reset spring (4) is wound around the pull rod (11), one end of which is connected to the other end of the reset rod (5), and the other end of which is connected to the connection between the upper joint (1) and the pull rod (11).

3. The anti-slip device for an upturned well for a downhole tractor according to claim 2, It is characterized in that The pull rod (11) is arranged at the center position of the two reset rods (5).

4. The anti-slip device for an upturned well for a downhole tractor according to claim 2, It is characterized in that The support arm device comprises two mutually connected auxiliary support arms (8) and a main support arm (9); the auxiliary support arm (8) and the main support arm (9) are connected by a pin; One end of the auxiliary arm (8) is pin-connected to one end of the reset rod (5); the other end of the auxiliary arm (8) is pin-connected to one end of the main arm (9); and the other end of the main arm (9) is pin-connected to the housing (10).

5. The anti-slip device for an upturned well for a downhole tractor according to claim 4, It is characterized in that The pin connections are all achieved by using a connecting pin shaft (7).

6. The anti-slip device for a downhole tractor according to claim 1, It is characterized in that The upper joint (1) is connected to one end of the pull rod (11) via a pull rod pin shaft (3); a connecting ring (2) is provided between the upper joint (1) and the pull rod pin shaft (3).

7. The anti-slip device for an upturned well for a downhole tractor according to claim 6, It is characterized in that The support arm reset spring (4) is wound around the pull rod (11), one end of which is connected to the other end of the reset rod (5), and the other end of which is connected to the pull rod pin (3).

8. The anti-slip device for an upturned well for a downhole tractor according to claim 1, It is characterized in that The upper connector (1) is connected to the logging cable connection bridle; the outer shell (10) is connected to the instrument string.

9. A method for using the anti-slip device for a downhole tractor according to claim 1, It is characterized in that The following steps are involved: When the housing (10) moves upward, the housing (10) drives the arm device to retract, thereby achieving smooth lifting of the entire device; when the target layer of the upwelling well is reached, the arm device is supported by the reset device, so that the arm device forms a reverse self-locking in the casing to fix the instrument.

10. A method for using the anti-slip device for a downhole tractor according to claim 9, It is characterized in that The reset device comprises two reset rods (5), a transmission plate (6), a support arm reset spring (4) and a pull rod reset spring (12); the reset device comprises two auxiliary support arms (8) and a main support arm (9) connected to each other; When the housing (10) moves upward, the housing (10) drives the main arm (9) to move upward, and the bridle connected to the logging cable drives the upper joint (1) to remain stationary. At this time, the main arm (9) and the reset rod (5) produce relative displacement, driving the pull rod (11) and the rotating disk (6), the arm reset spring (4) and the pull rod reset spring (12) to compress, and the auxiliary arm (8) is pulled to retract the main arm (9) into the housing, so that the entire device can be lifted smoothly; When the target layer of the upturned well is reached, the resetting device supports the auxiliary support arm (8) and the main support arm (9), forms a reverse self-locking in the casing, and fixes the instrument.