Lockable jarring safety release device

Abstract

This invention relates to a lockable shock-type safety release device, comprising an inner mandrel assembly and an outer cylinder assembly covering the inner mandrel assembly; the inner mandrel assembly includes a splined mandrel, a metering mandrel, and a reversed mandrel connected in sequence; the outer cylinder assembly includes a splined outer cylinder, a metering outer cylinder, a connecting short section, a reversed outer cylinder, a connecting joint, and a lower joint connected and sleeved on the inner mandrel assembly, and a tension sleeve is installed between the end of the reversed mandrel and the inner wall of the lower joint; when stuck, the inner mandrel assembly moves upward relative to the outer cylinder assembly, the tension sleeve is broken, and during the upward movement of the inner mandrel assembly, the shock surface on the splined mandrel impacts one end of the splined outer cylinder, thereby impacting the outer cylinder assembly. This repeated impact release releases the tool from the stuck state; this invention can release the tool from the stuck state after it gets stuck in the well, and retrieve and lift all the downhole tools, reducing the overall cost of tools and drilling.

Description

Technical Field

[0001] This invention belongs to the technical field of exploration and development testing tools or other pipe string operation tools, and particularly relates to a lockable shock-type safety release device. Background Technology

[0002] During formation testing, safety couplings are safety tools that are easily disconnected and reconnected to the tubing string inside the well. Installed at the point where the tubing needs to be disconnected, they transmit torque and withstand various complex stresses along with the tubing string. In the event of a fault in the well, the working tubing string can be disconnected or reconnected by operators at the wellhead, providing protection against and resolving downhole accidents. Currently, most safety couplings are separated by reverse opening or shearing the shear pins. After years of field application, commonly used safety couplings such as BW and RTTS often fail to disconnect properly in deep, deviated, and complex wells due to insufficient operational precision or cumbersome procedures. Conventional shock absorbers are generally not lowered into the well with the casing testing tubing. If the tubing string becomes stuck, the original tubing safety coupling must first be disconnected, and the tools and tubing above it must be retrieved before lowering the safety coupling to retrieve the tools and shock absorber tubing string. This increases well control risks and the two tubing runs increase labor intensity and operation time, thereby increasing extraction costs. Summary of the Invention

[0003] The purpose of this invention is to provide a lockable shock safety release device that, in addition to fulfilling the function of the safety connector itself, can perform multiple reciprocating up-and-down shocks after a downhole tool becomes stuck, thereby releasing the tool from its stuck state and retrieving the entire downhole tool, preventing blockage of the drilling and reducing the overall cost of the tool and drilling.

[0004] The technical problem solved by this invention is achieved through the following technical solution:

[0005] A lockable shock-type safety release device includes an inner mandrel assembly and an outer cylinder assembly covering the inner mandrel assembly.

[0006] The inner mandrel assembly includes a spline mandrel, a metering mandrel, and a reverse mandrel connected in sequence; the outer cylinder assembly includes a spline outer cylinder, a metering outer cylinder, a connecting short section, a reverse outer cylinder, a connecting joint, and a lower joint connected and sleeved on the inner mandrel assembly, and a tension sleeve is installed between the end of the reverse mandrel and the inner wall of the lower joint.

[0007] The splined outer cylinder and the metering outer cylinder are respectively provided with an upper oil injection hole and a lower oil injection hole. An upper oil injection cavity is formed between the splined outer cylinder and the splined mandrel, which passes through the upper oil injection hole. A driving protrusion is formed on the outer wall of the metering mandrel. A time-delay copper valve is installed between the driving protrusion and the end of the splined mandrel. The gap between the time-delay copper valve and the metering outer cylinder changes abruptly from a small gap downstream to a large gap upstream. A lower oil injection cavity is formed between the metering mandrel downstream of the driving protrusion and the metering outer cylinder, which passes through the lower oil injection hole. The hydraulic oil can flow back and forth between the upper and lower oil filling chambers through the gap between the inner mandrel assembly and the outer cylinder assembly. When jammed, the inner mandrel assembly moves upward relative to the outer cylinder assembly, and the tension sleeve is broken. During the upward movement, the inner mandrel assembly impacts one end of the splined outer cylinder through the shock surface on the splined mandrel, thereby impacting the outer cylinder assembly. It then moves downward to reset, and after resetting, it moves upward again to impact. This process is repeated multiple times to release the tool from jamming.

[0008] Furthermore, a separation structure is provided between the outer cylinder assembly and the inner mandrel assembly to allow the inner mandrel assembly and the outer cylinder assembly above the inverted outer cylinder to be pulled out of the well.

[0009] Furthermore, the disengagement structure includes a threaded connection structure between the connecting short section and the inverted outer cylinder and an anti-torsion shear pin installed between the two, and the inverted mandrel and the inverted outer cylinder are limited by a spline fit.

[0010] Furthermore, a floating piston is installed inside the injection chamber.

[0011] Furthermore, an upper connector is fixedly connected to the upper end of the spline mandrel.

[0012] Furthermore, in the initial state, the end of the splined outer cylinder abuts against the end of the upper connector.

[0013] Furthermore, the time-delay copper valve has a tubular structure, and its outer surface is provided with several grooves at intervals.

[0014] Furthermore, the tension sleeve is a tubular structure, with its outer wall at one end fixedly connected to the lower connector, and its inner wall at the other end fixedly connected to one end of the inverted mandrel, and an annular breakable groove is formed on the inner wall of the tension sleeve between the two ends.

[0015] Furthermore, after the tubing operation is completed, the tubing is lifted. If the packer fails to be released, it is lifted beyond the weight of the tubing suspension to the breaking force of the tension sleeve, thereby activating the hydraulic shock function.

[0016] The advantages and positive effects of this invention are:

[0017] 1. In this invention, during the process of lowering the safety connector into the well, if the downhole tool connected to it gets stuck, an external force is applied to the inner mandrel assembly, which can move the inner mandrel assembly up and down relative to the outer cylinder assembly, and generate a reciprocating shock force on the outer cylinder assembly. This force is then transmitted to the stuck tool connected to its bottom, thereby relieving the stuck state of the downhole tool. Therefore, this safety connector integrates a shock structure on the basis of its own function as a safety connector, so as to quickly overcome the situation of getting stuck in the well. It is highly integrated and solves the difficulty of the current safety connector needing to be lowered separately to relieve the stuck situation, thus improving the smoothness and efficiency of downhole operations.

[0018] 2. This invention achieves a more powerful shock effect by extending the delay time, and designs a tension sleeve to make the shock function controllable; it also has the function of safely releasing the pipe string by rotating it after shearing the locking pin; and it integrates the functions of the shocker and the safety joint, reducing two pipe strings to one, and has the ability to deal with stuck drill accidents in the first instance, realizing the continuity and convenience of oil drilling projects, and greatly reducing the cost of oil and gas extraction. Attached Figure Description

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of a lockable shock-type safety release device provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle;

[0022] Figure 3 for Figure 1 Enlarged view of the structure at point B;

[0023] Figure 4 for Figure 1 Enlarged view of the structure at point C;

[0024] Figure 5 for Figure 1 Enlarged view of the structure at point D;

[0025] Figure 6 A schematic diagram of the structure of a time-delay copper valve for a lockable shock-type safety release device provided in an embodiment of the present invention; Detailed Implementation

[0026] First, it should be noted that the specific structure, features, and advantages of the present invention will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] like Figures 1 to 6 This embodiment provides a lockable shock-type safety release device, including an inner mandrel assembly and an outer cylinder assembly covering the inner mandrel assembly.

[0030] The inner mandrel assembly includes a splined mandrel 3, a metering mandrel 7, and a reversed mandrel 10 connected in sequence; the outer cylinder assembly includes a splined outer cylinder 2, a metering outer cylinder 4, a connecting short section 8, a reversed outer cylinder 11, a connecting joint 12, and a lower joint 13 connected and sleeved on the inner mandrel assembly, and a tension sleeve 16 is installed between the end of the reversed mandrel 10 and the inner wall of the lower joint 13; specifically, the splined mandrel 3, the metering mandrel 7, and the reversed mandrel 10 are connected by threads, and a sealing ring is installed at the connection to achieve a sealed connection; the splined outer cylinder 2 and the metering outer cylinder 4 are connected by threads, and a sealing ring is installed at the connection to achieve a sealed connection.

[0031] The splined outer cylinder 2 and the metering outer cylinder 4 are respectively provided with an upper oil injection hole 14 and a lower oil injection hole 15. An upper oil injection cavity 101 is formed between the splined outer cylinder 2 and the splined mandrel 3, which passes through the upper oil injection hole. A driving protrusion 7a is formed on the outer wall of the metering mandrel 7. A time-delay copper valve 5 is installed between the driving protrusion 7a and the end of the splined mandrel 3. The gap between the time-delay copper valve and the metering outer cylinder 4 changes abruptly from a small gap downstream to a large gap upstream. Specifically, as shown in the figure... Figure 3 As shown, the inner diameter of the metering outer cylinder 4 abruptly increases through the arc transition surface 4b, thereby forming the shock release section 103. The metering mandrel 7 downstream of the driving protrusion 7a forms a downfilling oil chamber 102 that penetrates the downfilling oil hole between the metering outer cylinder 4 and the downfilling oil chamber. A floating piston 6 is installed in the downfilling oil chamber. The floating piston is in sealed contact with the metering outer cylinder 4 and the metering mandrel 7. The floating piston can compensate for the pressure in the downfilling oil chamber when the device is lowered into the well. The hydraulic oil can flow back and forth between the upper and lower downfilling oil chambers through the gap between the inner mandrel assembly and the outer cylinder assembly. When stuck, the inner mandrel assembly moves upward relative to the outer cylinder assembly, and the tension sleeve 16 is broken. During the upward movement, the inner mandrel assembly shocks one end of the splined outer cylinder 2 through the shock surface 3a on the splined mandrel 3, thereby shocking the outer cylinder assembly. It moves downward in the opposite direction to reset, and after reset, it moves upward again to shock. This repeated shocking multiple times can release the stuck state of the tool.

[0032] In addition, a separation structure is provided between the outer cylinder assembly and the inner mandrel assembly to allow the inner mandrel assembly and the outer cylinder assembly above the inverted outer cylinder 11 to be pulled downhole. Specifically, the separation structure includes a threaded connection structure between the connecting section 8 and the inverted outer cylinder 11 and an anti-torsion shear pin 9 installed between them. The inverted mandrel 10 and the inverted outer cylinder 11 are limited by a spline 1001. If multiple shocks fail to release the jamming, the separation structure is activated to achieve the release function. Specifically, the tubing is lowered to the free point of the device (there is no hydraulic delay effect when lowering the tubing), and slightly lifted to ensure that the spline of the inverted mandrel and the splined outer cylinder are disengaged. At this time, it is only necessary to turn the tubing clockwise to cut the anti-torsion shear pin, continue to turn the tubing clockwise 8-10 times, reverse the left-hand sawtooth thread connecting the connecting section and the splined outer cylinder, and lift the tubing to release it. After the tubing is released, the upper tool is retrieved and a special retrieval tool is lowered for subsequent operations. The device is equipped with salvage tools, and can also be salvaged using common salvage tools.

[0033] Specifically, such as Figure 2 As shown, the upper end of the spline mandrel 3 is also fixedly and sealed with an upper connector 1. In the initial state, the end of the spline outer cylinder 2 abuts against the end of the upper connector 1, and the spline outer cylinder 2 located upstream of the upper oil injection chamber is in sealed contact with the spline mandrel 3 to prevent hydraulic oil leakage.

[0034] like Figure 6 As shown, the time-delay copper valve has a tubular structure, and the outer surface of the time-delay copper valve is provided with several grooves 5a at intervals. The function of the grooves 5a is to facilitate the flow of hydraulic oil and prevent impurities in the hydraulic oil from clogging the gap between the time-delay copper valve and the metering mandrel 7 and the metering outer cylinder 4, so that the hydraulic oil cannot flow back and forth between the upper oil filling chamber and the lower oil filling chamber.

[0035] The tension sleeve is a tubular structure. One end of its outer wall is fixedly connected to the lower connector, and the other end of its inner wall is fixedly connected to one end of the inverted mandrel 10. An annular fractured groove is formed on the inner wall of the tension sleeve between the two ends. When the tubing operation is completed, the tubing is lifted. If the unsealing of the packer fails, it is lifted beyond the weight of the tubing until the tension sleeve breaks, thereby activating the hydraulic shock function.

[0036] As an example, in this embodiment, when using the device, during the wellhead insertion phase, the hydraulic shock function and right-hand reverse-threading function are locked by the tension sleeve. At this time, the reverse-threading mandrel and the spline of the splined outer cylinder are in a mating state, and the tool can transmit torque normally without affecting the use of tools that require torque operation, such as the setting of mechanical packers. After the tubing operation is completed, the packer is released, and the tool is lifted beyond the tubing suspension weight to within 80% of the tension sleeve's tensile strength. If the packer is released normally, the device will not start and can be pulled out with the tubing. If the normal release tension range cannot release the packer, the tool is lifted beyond the tubing suspension weight to the tension sleeve's breaking tension, releasing the locked state and activating the hydraulic shock function. The hydraulic shock function uses a gap delay principle, connecting the upper and lower injection chambers through a very small gap. During the tubing lifting process... Hydraulic oil in the upper injection chamber flows slowly into the lower injection chamber through a small gap, providing time for the tubing string to stretch and store energy. The time-delay copper valve slowly moves to the metering outer cylinder expansion section. At this time, hydraulic oil flows rapidly from the upper injection chamber to the lower injection chamber. The spline mandrel accelerates upward with the tubing string and impacts the lower end face of the spline outer cylinder, generating an upward vibration force to release the packer. This repeated vibration can release the tool from the stuck state. If the tool is still stuck after multiple vibrations, a separation structure is provided between the outer cylinder assembly and the inner mandrel assembly to separate them in the case of a stuck safety joint. This separation structure can appropriately separate the outer cylinder assembly and the inner mandrel assembly, and retrieve a portion of the outer cylinder assembly and the inner mandrel assembly, thereby releasing the stuck state and reducing tool loss.

[0037] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A lockable shock-type safety release device, characterized in that: Includes an inner mandrel assembly and an outer cylinder assembly that covers the inner mandrel assembly; The inner mandrel assembly includes a spline mandrel, a metering mandrel, and a reverse mandrel connected in sequence; the outer cylinder assembly includes a spline outer cylinder, a metering outer cylinder, a connecting short section, a reverse outer cylinder, a connecting joint, and a lower joint connected and sleeved on the inner mandrel assembly, and a tension sleeve is installed between the end of the reverse mandrel and the inner wall of the lower joint. The splined outer cylinder and the metering outer cylinder are respectively provided with an upper oil injection hole and a lower oil injection hole. An upper oil injection cavity is formed between the splined outer cylinder and the splined mandrel, which passes through the upper oil injection hole. A driving protrusion is formed on the outer wall of the metering mandrel. A time-delay copper valve is installed between the driving protrusion and the end of the splined mandrel. The gap between the time-delay copper valve and the metering outer cylinder changes abruptly from a small gap downstream to a large gap upstream. A lower oil injection cavity is formed between the metering mandrel downstream of the driving protrusion and the metering outer cylinder, which passes through the lower oil injection hole. The hydraulic oil can flow back and forth between the upper and lower oil filling chambers through the gap between the inner mandrel assembly and the outer cylinder assembly. When jammed, the inner mandrel assembly moves upward relative to the outer cylinder assembly, and the tension sleeve is broken. During the upward movement, the inner mandrel assembly impacts one end of the splined outer cylinder through the shock surface on the splined mandrel, thereby impacting the outer cylinder assembly. It then moves downward to reset, and after resetting, it moves upward again to impact. This process is repeated multiple times to release the tool from jamming.

2. The lockable shock-type safety release device according to claim 1, characterized in that: A separation structure is provided between the outer cylinder assembly and the inner mandrel assembly, which allows the inner mandrel assembly and the outer cylinder assembly above the inverted outer cylinder to be pulled out of the well.

3. The lockable shock-type safety release device according to claim 2, characterized in that: The disengagement structure includes a threaded connection between the connecting short section and the inverted outer cylinder, and an anti-torsion shear pin installed between the two. The inverted mandrel and the inverted outer cylinder are limited by a spline fit.

4. The lockable shock-type safety release device according to claim 1, characterized in that: A floating piston is installed inside the injection chamber.

5. The lockable shock-type safety release device according to claim 1, characterized in that: The upper end of the spline mandrel is also fixedly connected to an upper connector.

6. The lockable shock-type safety release device according to claim 5, characterized in that: In the initial state, the end of the splined outer cylinder abuts against the end of the upper connector.

7. The lockable shock-type safety release device according to claim 1, characterized in that: The time-delay copper valve has a tubular structure, and its outer surface is provided with several grooves at intervals.

8. The lockable shock-type safety release device according to claim 1, characterized in that: The tension sleeve is a tubular structure, with its outer wall at one end fixedly connected to the lower connector and its inner wall at the other end fixedly connected to one end of the inverted mandrel. An annular breakable groove is formed on the inner wall of the tension sleeve between the two ends.

9. The lockable shock-type safety release device according to claim 1, characterized in that: After the tubing operation is completed, the tubing is lifted. If the packer fails to be released, it is lifted beyond the weight of the tubing suspension to the breaking force of the tension sleeve, thereby activating the hydraulic shock function.

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