A safety releasing tool for drilling while drilling

Abstract

The utility model discloses a kind of well drilling safety release tools, belong to petroleum drilling technical field.The tool includes the upper joint, upper outer tube, center tube and lower joint connected in sequence.Sealing element, safety pin and anti-rotation assembly are sleeved on center tube, and clamping jaw locking structure is equipped between upper outer tube and lower joint.When sticking occurs in downhole, raise pipe string and cut safety pin, make clamping jaw locking structure disengage, through rotating upper outer tube and anti-rotation assembly to reverse buckle and release, to raise upper pipe string.The utility model can withstand high temperature, high pressure, high corrosion environment, with the advantages of reliable release, reusable, especially suitable for ultra-deep well complex working condition under well drilling safety operation.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology and provides a safe hand release tool for drilling. Background Technology

[0002] As wellbore designs become increasingly complex, the connection of drill strings to valuable measuring instruments and equipment is common during drilling operations. Drill bit sticking occurs frequently due to geological conditions and human error during drilling. Field surveys have revealed that sticking points are often located at the drill bit. In complex situations such as stuck drill bits downhole, the loss of high-value instruments and drilling equipment is significant. To address this, a drilling safety drop tool is proposed, installed at a point above the drill bit. When stuck drill bits cannot be handled by other methods, it can be quickly detached, allowing the upper tubing to be retrieved for further processing. This reduces operational losses and facilitates subsequent drill bit retrieval. Currently, conventional drilling drop tools cannot withstand the high temperatures, high pressures, high loads, and highly corrosive working environments of deep wells, resulting in the lack of a reliable drilling safety drop tool for handling such deep well stuck drill bit incidents.

[0003] Given the poor adaptability, non-reusability, and low reliability of existing release tools in deep and ultra-deep wells under high temperature, high pressure, and high load environments, there is an urgent need to develop a new type of safe release tool that can withstand extreme working conditions, achieve reliable and controllable release, and be reusable, so as to reduce drilling risks and costs. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a safe release tool for drilling, solving the following technical problems: It addresses the inability of existing release tools to adapt to the extreme environments of deep wells: conventional tools struggle to withstand the high temperatures, high pressures, high loads, and highly corrosive working conditions of deep wells; it reduces economic losses in stuck pipe accidents: avoiding the loss of valuable downhole measuring instruments and drilling equipment due to stuck pipe; it provides a reliable and rapid release mechanism: when stuck pipe occurs and other methods fail, it can quickly and safely release the tool and retrieve the upper tubing string; and it facilitates subsequent accident handling: providing convenience for subsequent operations such as drill bit retrieval.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a drilling safety release tool, comprising an upper connector and an upper outer tube connected in sequence, a central tube sleeved inside the upper outer tube, a lower connector connected to the lower end of the central tube, and an anti-rotation assembly provided between the central tube and the upper outer tube.

[0006] Preferably, the anti-rotation assembly includes: an axial limiting groove formed on the outer wall of the central tube; a limiting steel ball that slides in cooperation with the axial limiting groove; a through hole formed on the side wall of the upper outer tube and in a limiting cooperation with the limiting steel ball; and a pressure cap connected to the through hole and in a limiting cooperation with the limiting steel ball.

[0007] Preferably, the through hole is a semi-threaded hole, and the pressure cap is threadedly connected to the through hole.

[0008] Preferably, the anti-rotation assembly is arranged in multiple radially symmetrical groups.

[0009] Preferably, a locking structure with claws is provided between the upper outer tube and the lower connector.

[0010] Preferably, the claw locking structure is a concave-convex locking structure, including a protrusion on the lower end face of the upper outer tube and a recess on the upper end face of the lower connector, wherein the protrusion and the recess are inserted into each other.

[0011] Preferably, an anti-rotation pin is provided between the upper connector and the upper outer tube; a safety pin is provided between the central tube and the upper outer tube.

[0012] Preferably, a sealing gasket is provided between the lower end face of the upper connector and the upper end face of the central tube.

[0013] Preferably, sealing rings are provided between the upper connector and the upper outer tube, between the central tube and the upper outer tube, and between the inner and outer walls of the central tube.

[0014] Preferably, the upper connector is threaded to the upper outer tube, and the central tube is threaded to the lower connector.

[0015] The advantages of this utility model are as follows: safe and reliable card release operation; resistant to high pressure, high temperature and corrosion; can withstand high loads; reusable; no subsequent risks during construction; particularly suitable for ultra-deep well drilling operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure; Figure 2 This is a schematic diagram of the chuck locking structure; In the diagram: 1-Upper connector, 2-Anti-rotation pin, 3-First sealing ring, 4-First sealing gasket, 5-Safety pin, 6-Upper outer tube, 7-Central tube, 8-Anti-rotation assembly, 9-Second sealing ring, 10-Second sealing gasket, 11-Lower connector. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] like Figure 1As shown, the present invention provides a drilling safety release tool, which mainly includes an upper connector 1, an anti-rotation pin 2, a first sealing ring 3 and a second sealing ring 9, a first sealing gasket 4 and a second sealing gasket 10, a safety pin 5, an upper outer tube 6, a central tube 7, an anti-rotation assembly 8, and a lower connector 11.

[0019] The upper connector 1 is connected to the drill string at its upper end, and its lower end is fixedly connected to the upper outer tube 6 via an anti-rotation pin 2 to prevent relative rotation. A first sealing gasket 4 is provided between the upper connector 1 and the upper end of the central tube 7 to enhance axial sealing. The central tube 7 is sequentially fitted with a first sealing ring 3, a safety pin 5, an anti-rotation assembly 8, a second sealing ring 9, and a second sealing gasket 10 from top to bottom. The first sealing ring 3 is located inside the joint between the upper connector 1 and the upper outer tube 6 to achieve radial dynamic sealing.

[0020] The anti-rotation assembly 8 consists of a pressure cap and multiple anti-rotation steel balls (see reference). Figure 1 (Not fully shown) The pressure cap is threaded to the outer wall of the central tube 7. Anti-rotation steel balls are distributed between the inner groove of the pressure cap and the corresponding slot of the central tube 7. They are used to transmit torque during normal drilling and to assist in backing during unblocking.

[0021] The upper end of the lower connector 11 is fixedly connected to the lower end of the central tube 7 by threads, and a second sealing ring 9 and a second sealing gasket 10 are provided between them to achieve high-pressure sealing. The lower end of the upper outer tube 6 is provided with an inwardly protruding claw structure, and the corresponding position of the upper end of the lower connector 11 is provided with a groove. The two engage to form a claw locking mechanism (see reference). Figure 2 ( ), and keep it locked during tool lowering and operation.

[0022] After the tool is lowered into the well with the drill string, when it is in normal working condition, the torque is transmitted to the central tube 7 and the lower drill string through the upper outer tube 6 and the anti-rotation assembly 8; the drilling fluid flows through the inner hole of the central tube.

[0023] When a stuck drill string occurs downhole and the drill string needs to be released, first lift the drill string. When the pulling force reaches the predetermined threshold, the safety pin 5 is sheared. Continue lifting, and the locking mechanism of the convex and concave jaws disengages. Then rotate the drill string clockwise. The torque is transmitted through the upper outer tube 6 and the anti-rotation assembly 8, which pushes the central tube 7 and the lower connector 11 to rotate relative to each other, achieving reverse coupling. After reverse coupling is completed, the upper connector 1 and all drill strings above it can be pulled out, completing the safe release operation.

[0024] This utility model has a structure that is resistant to high temperature and corrosion, has high pressure resistance, and can be reused. It is especially suitable for safe hands-off operation during drilling in deep and ultra-deep wells.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A drilling safety release tool, comprising an upper connector and an upper outer tube connected in sequence, wherein a central tube is sleeved inside the upper outer tube, and a lower connector is connected to the lower end of the central tube, characterized in that, An anti-rotation assembly is provided between the central tube and the upper outer tube; the anti-rotation assembly includes: an axial limiting groove formed on the outer wall of the central tube; a limiting steel ball that slides in conjunction with the axial limiting groove; a through hole formed on the side wall of the upper outer tube and limited in conjunction with the limiting steel ball; a pressure cap connected to the through hole and limited in conjunction with the limiting steel ball; the through hole is a semi-threaded hole, and the pressure cap is threadedly connected to the through hole; the anti-rotation assembly is arranged in multiple radially symmetrical sets; a pawl locking structure is provided between the upper outer tube and the lower connector; the pawl locking structure is a concave-convex locking structure, including a protrusion on the lower end face of the upper outer tube and a recess on the upper end face of the lower connector, the protrusion and the recess being inserted into each other; an anti-rotation pin is provided between the upper connector and the upper outer tube; a safety pin is provided between the central tube and the upper outer tube.

2. The drilling safety release tool according to claim 1, characterized in that, A sealing gasket is provided between the lower end face of the upper connector and the upper end face of the central tube.

3. The drilling safety release tool according to claim 1, characterized in that, Sealing rings are provided between the upper connector and the upper outer tube, between the central tube and the upper outer tube, and between the inner and outer walls of the central tube.

4. A drilling safety release tool according to any one of claims 1-3, characterized in that, The upper connector is threaded to the upper outer tube, and the central tube is threaded to the lower connector.

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