Upwarp well operation reverse sliding prevention short section

Abstract

The invention relates to the technical field of anti-back-sliding equipment, and particularly discloses an upwarp well operation anti-back-sliding short section which comprises a shell, a baffle is arranged in the shell, a connecting rod is arranged in the middle of the baffle in a penetrating mode, one end of the connecting rod is provided with a first elastic piece in abutting fit with the baffle, and the other end of the connecting rod is provided with an upper connector with the front end extending out of the shell. Supporting arm push rods penetrate through the baffle at the two ends of the connecting rod, a check block is arranged at one end of each supporting arm push rod, an anti-slip assembly is arranged at the other end of each supporting arm push rod, each check block is connected with a second elastic piece connected with the tail end of the upper connector, and a push plate is arranged on the connecting rod between the check blocks and the baffle and matched with the check blocks in an abutting mode; the anti-slip assembly comprises a first supporting arm and a second supporting arm which are hinged, the first supporting arm is hinged to the supporting arm push rod, the second supporting arm is installed in the shell in a hinged mode, and a strip-shaped opening allowing the first supporting arm and the second supporting arm to stretch out is formed in the shell. According to the invention, the reverse slipping phenomenon can be effectively prevented, and the construction safety of the crawl device during well upwarping operation is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-slip equipment, and in particular relates to an anti-slip short joint for upwelling well operations. Background Art

[0002] Compared to various techniques and methods used in horizontal well operations, the use of crawlers in cased wells demonstrates significant advantages. As a downhole equipment delivery tool specifically designed for horizontal and highly deviated wells, crawlers play a crucial role in these operations. When downhole equipment becomes unable to be lowered due to gravity, crawlers, using their built-in power unit, precisely deliver the equipment to the target well section.

[0003] Compared to traditional drill pipe conveying, crawler conveying significantly reduces construction time, eases operator workload, and effectively mitigates construction risks. Furthermore, crawler conveying requires no derrick support, further reducing operating costs. Compared to coiled tubing, crawler conveying offers unique advantages: longer conveying distances, unrestricted by well depth; a simple and efficient construction process, precise depth control, and relatively low operating costs.

[0004] Due to these numerous advantages, crawlers are now widely used in various horizontal and highly deviated well operations, and their construction technology is constantly improving and maturing. As a conveying tool, a crawler's primary responsibility is to safely and accurately transport downhole equipment to the target well section. During operation, the crawler is maintained in a centered position by roller centralizers. Hydraulic power is then used to push the crawler arm outward, allowing the crawler wheel to fit tightly against the casing wall. The crawler wheel then rotates, driven by mechanical gears, propelling the instrument along the casing wall. When the crawler stops operating, the crawler arm automatically retracts.

[0005] After the downhole equipment is pushed to the target well section, the crawler stops, the crawler arm retracts, and logging operations begin. For horizontal well sections with a 90° inclination, the crawler and its downhole equipment remain stable without any movement. However, for horizontal well sections with inclinations less than 90°, the crawler may risk slipping forward. However, the tension of the rear-end cable allows normal logging operations to continue without affecting the work process.

[0006] However, in actual horizontal well construction, wellbore trajectories vary widely, with most wellbore inclinations being less than or around 90°. In such cases, the use of a crawler allows the tool string to remain stably within the target well section, awaiting subsequent operations. However, it is worth noting that in actual well construction, well sections with inclinations exceeding 90°, even reaching 103° or greater, are often encountered. These sections are known as upwarped wells.

[0007] When the crawler stops operating in an upturned section after reaching the target wellbore, the crawler arm retracts, causing the instrument string to lose support against the casing wall. Simultaneously, the roller centralizer reduces frictional resistance. As the upturn angle increases, the instrument string can slip backward under its own weight, potentially damaging the cable and, in severe cases, even severing it, leading to a serious fall.

[0008] Therefore, we propose an anti-slip short joint for upturned well operations to solve the above technical problems. Summary of the Invention

[0009] In order to solve the technical problems existing in the above-mentioned prior art, the present invention proposes an anti-slip short joint for upwelling well operation.

[0010] The technical solution adopted in the present invention is as follows:

[0011] The cam is fixedly provided with a first arm and a second arm connected to the support arm, and the cam is hingedly mounted on the support arm, wherein the cam is fixedly provided with a first arm and a second arm connected to the support arm by a hinge. The cam is fixedly provided with a first arm and a second arm connected to the support arm by a hinge. The cam is hingedly mounted on the support arm, and the cam is hingedly mounted on the support arm

[0012] In a further technical solution, the first elastic member is a main spring, a cover is provided at one end of the connecting rod away from the baffle, the main spring is sleeved on the connecting rod, and both ends of the main spring are tightly fitted with the cover and the baffle respectively.

[0013] In a further technical solution, the second elastic member is a push rod spring, and both ends of the push rod spring are respectively connected to the stop block and the tail end of the upper joint.

[0014] In a further technical solution, a limiting plate is provided at the tail end of the upper joint to prevent the upper joint from sliding out of the housing, and the second elastic member is connected to the limiting plate.

[0015] In a further technical solution, the end of the second arm is hinged with a hinge seat, and the hinge seat is fixedly installed in the shell.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The present invention can effectively prevent the crawler from slipping back due to gravity or well wall inclination, ensuring that the instrument string can maintain a stable stationary state. It also avoids the risk of cable damage or cutting due to slipping back, and improves the construction safety of the crawler during upwelling operations.

[0018] 2. The present invention features a simple, modular design, making it easy to install, maintain, and use while also improving construction efficiency. Its purely mechanical design eliminates the need to increase system control complexity, thereby reducing the failure rate. Furthermore, the anti-slip sub can be selectively configured to meet diverse operational requirements, depending on the specific well conditions.

[0019] 3. In the present invention, the limit plate can not only prevent the upper joint from sliding out of the shell, ensuring the stability of the structure, but also prevent the first elastic member and the second elastic member from being over-compressed, resulting in structural damage or failure, thereby effectively ensuring the stability and reliability of the anti-slip short section during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure markings: 1-housing, 2-baffle, 3-connecting rod, 4-first elastic member, 5-upper joint, 6-support arm push rod, 7-stopper, 8-second elastic member, 9-push plate, 10-first support arm, 11-second support arm, 12-cover plate, 13-limiting plate, 14-hinge seat. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example:

[0025] See Figure 1 The present invention provides an anti-slip short section for upturned well operation, comprising a shell 1, a baffle 2 fixedly provided inside the shell 1, an axially slidable connecting rod 3 penetrating the middle of the baffle 2, one end of the connecting rod 3 is provided with a first elastic member 4 tightly fitted with the baffle 2, and the other end is provided with an upper joint 5 with a front end extending out of the shell 1, the baffle 2 is provided with an axially slidable support arm push rod 6 at both ends of the connecting rod 3, the support arm push rod 6 is provided with a stopper 7 at one end close to the upper joint 5, and an anti-slip assembly 6 at the other end. Part, the stopper 7 is connected to a second elastic part 8, the second elastic part 8 is connected to the tail end of the upper joint 5, the connecting rod 3 is fixedly sleeved with a push plate 9 between the stopper 7 and the baffle 2, the push plate 9 and the stopper 7 abut and cooperate, the anti-slip assembly includes a first arm 10 and a second arm 11 hingedly connected by a hinge, the first arm 10 is hinged to the support arm push rod 6, the second arm 11 is hingedly installed in the shell 1, and the shell 1 is provided with a strip opening for the first arm 10 and the second arm 11 to extend out.

[0026] The specific working principle of this anti-slip sub in actual underground operation is as follows:

[0027] First, the anti-slip sub, like other subs, can be installed in a crawler system. The upper connector 5 connects to the cable at one end and downhole equipment at the other. As the crawler crawls forward along the casing, the friction between the cable and the casing wall acts on the upper connector 5 of the anti-slip sub, causing it to pull backward. This pulling force, combined with the crawler's forward driving force, forms a pair of opposing forces, acting on both ends of the anti-slip sub. Specifically, during this process, the backward friction of the cable acts through the upper connector 5 on the interior of the anti-slip sub, causing the connecting rod 3 to move and compress the first elastic member 4. Simultaneously, the push plate 9 on the connecting rod 3 pushes the stopper 7 and compresses the second elastic member 8. The movement of the stopper 7 also drives the support arm push rod 6 to move synchronously, triggering the first and second arms 10 and 11 to retract under the guidance of the support arm push rod 6. At this point, the anti-slip sub is in a retracted state, facilitating the crawler's forward crawling. When the crawler stops working, the forces exerted by the cable and the crawler on the anti-backflow short section disappear. At this time, the first elastic member 4 and the second elastic member 8 quickly release their elastic force, pushing the connecting rod 3, the block 7 and the support arm push rod 6 back to their initial positions. This reset process causes the first arm 10 and the second arm 11 to reopen and fit tightly against the casing wall, forming effective friction resistance. This mechanism can effectively prevent the crawler from backflowing due to gravity or well wall tilt when it stops, ensuring that the instrument string can maintain a stable stationary state. At the same time, it also avoids the risk of cable damage or cutting due to backflow, improving the construction safety of the crawler during upwelling operations. In addition, the anti-backflow short section has a simple structure and adopts a modular design, which is not only easy to install, maintain and use, but also improves construction efficiency. Its purely mechanical structure design does not require increasing the complexity of system control, thereby reducing the failure rate. According to the specific construction well conditions, the anti-backflow short section can be selectively configured to meet different operational requirements. The flexible opening and closing mechanism of the first and second arms 10, 11 effectively solves the problem of backflow during crawler operations in upturned wells, providing strong support for the promotion and application of crawler construction technology. It is worth mentioning that the number of anti-slip components can be increased and evenly distributed around the circumference of the housing 1, effectively increasing the friction between the anti-slip nipple and the casing wall, further reducing the risk of backflow.

[0028] In a specific embodiment, see Figure 1 The first elastic member 4 is a main spring, and a cover plate 12 is provided at one end of the connecting rod 3 away from the baffle 2. The main spring is sleeved on the connecting rod 3, and the two ends of the main spring are tightly fitted with the cover plate 12 and the baffle 2 respectively.

[0029] The main spring serves as the first elastic member 4, and its two ends are respectively tightly fitted with the cover plate 12 and the baffle 2, providing a stable preload force for the connecting rod 3. When the crawler crawls forward, the connecting rod 3 moves and compresses the main spring, and transmits the force to the block 7 through the push plate 9, thereby triggering the retraction action of the anti-slip assembly. When the crawler stops working, the main spring quickly releases its stored elastic force, pushing the connecting rod 3, the block 7 and the support arm push rod 6 back to the initial position, so that the anti-slip assembly opens and abuts against the casing wall, forming a stable friction resistance, effectively preventing the crawler from sliding back when it is stationary. This design is not only simple in structure, reducing manufacturing costs and maintenance difficulties, but the purely mechanical structure design also improves the reliability and durability of the anti-slip short section.

[0030] In a specific embodiment, see Figure 1 The second elastic member 8 is a push rod spring, and the two ends of the push rod spring are respectively connected to the stopper 7 and the tail end of the upper joint 5.

[0031] The push rod spring, serving as the second elastic member 8, provides a stable return force to the stopper 7 and the support arm push rod 6. When the crawler stops operating, the push rod spring quickly and smoothly releases its elastic force, pushing the stopper 7 and the support arm push rod 6 back to their initial positions. This in turn causes the anti-slip assembly to open and contact the casing wall, effectively preventing backslip and providing strong technical support for the crawler's operation in the upwelling section.

[0032] In a specific embodiment, see Figure 1 The tail end of the upper connector 5 is provided with a limiting plate 13 to prevent the upper connector 5 from sliding out of the housing 1 , and the second elastic member 8 is connected to the limiting plate 13 .

[0033] The limiting plate 13 can not only prevent the upper joint 5 from sliding out of the shell 1, ensuring the stability of the structure, but also prevent the first elastic member 4 and the second elastic member 8 from being over-compressed, resulting in structural damage or failure, thereby effectively ensuring the stability and reliability of the anti-slip short section during operation.

[0034] In a specific embodiment, see Figure 1 The end of the second arm 11 is hinged with a hinge seat 14, and the hinge seat 14 is fixedly installed in the shell 1.

[0035] The hinge seat 14 serves as a connector between the second arm 11 and the housing 1 , and realizes flexible rotation and stable support of the second arm 11 through a hinged manner, while simplifying the installation and maintenance process of the anti-slip short section, which is convenient for use.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. Anti-slip short joint for upturned well operation, characterized by: The invention comprises a shell (1), wherein a baffle (2) is fixedly provided inside the shell (1), an axially slidable connecting rod (3) is provided through the middle of the baffle (2), one end of the connecting rod (3) is provided with a first elastic member (4) tightly matched with the baffle (2), and the other end is provided with an upper joint (5) whose front end extends out of the shell (1), and the baffle (2) is provided with an axially slidable support arm push rod (6) at both ends of the connecting rod (3), the support arm push rod (6) is provided with a stopper (7) at one end close to the upper joint (5), and an anti-slip component is provided at the other end, and the stopper (7) is connected to A second elastic member (8) is connected to the tail end of the upper joint (5); the connecting rod (3) is fixedly provided with a push plate (9) between the stop block (7) and the baffle (2); the push plate (9) and the stop block (7) are in abutment with each other; the anti-slip assembly comprises a first arm (10) and a second arm (11) hingedly connected to each other by a hinge; the first arm (10) is hingedly connected to the support arm push rod (6); the second arm (11) is hingedly installed in the housing (1); and the housing (1) is provided with a strip opening for the first arm (10) and the second arm (11) to extend out.

2. The anti-slip short joint for upwelling well operation according to claim 1 is characterized in that: The first elastic member (4) is a main spring, and a cover plate (12) is provided at one end of the connecting rod (3) away from the baffle (2). The main spring is sleeved on the connecting rod (3), and the two ends of the main spring are respectively tightly fitted with the cover plate (12) and the baffle (2).

3. The anti-slip short joint for upwarping well operation according to claim 1 is characterized in that: The second elastic member (8) is a push rod spring, and the two ends of the push rod spring are respectively connected to the stopper (7) and the tail end of the upper joint (5).

4. The anti-slip short joint for upwarping well operation according to any one of claims 1 to 3, characterized in that: A limiting plate (13) is provided at the tail end of the upper joint (5) to prevent the upper joint (5) from sliding out of the housing (1), and the second elastic member (8) is connected to the limiting plate (13).

5. The anti-slip short joint for upwarping well operation according to claim 1 is characterized in that: The end of the second support arm (11) is hinged with a hinge seat (14), and the hinge seat (14) is fixedly installed in the housing (1).

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