Hydraulic releasing tool

Abstract

The utility model belongs to the technical field of petroleum drilling, and discloses a hydraulic releasing tool. The hydraulic releasing tool comprises a connecting unit and a spraying unit, the connecting unit comprises a main shell, a first limiting sleeve and a second limiting sleeve, a connecting channel is formed in the main shell, and the first limiting sleeve and the second limiting sleeve are arranged in the connecting channel in the axial direction in a spaced mode and abut against the inner wall of the connecting channel. The spraying unit is arranged in the connecting channel, and the outer wall of the spraying unit and the inner wall of the connecting channel define a containing cavity. The spraying unit comprises a first sealing pipe, a spraying assembly and a second sealing pipe which are sequentially connected, at least part of the first sealing pipe abuts against the first limiting sleeve, at least part of the second sealing pipe abuts against the second limiting sleeve, the spraying assembly is provided with a spraying channel, and the output end of the spraying channel is arranged on the side, facing the main shell, of the spraying assembly. The hydraulic releasing tool can quickly deal with drill jamming accidents and is simple to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, in particular to a hydraulic release tool. Background Art

[0002] During the oil extraction process, when the drill string gets stuck, a release tool is usually used to cut the connection part to separate the stuck part from the upper drill string, so as to deal with the stuck drill string accident in time, avoid damage to the entire drilling system, and prevent safety accidents such as blowouts and well leakage.

[0003] Existing release tools typically have an upper and lower joint connected by threads, with an elastic collet at the connection. The upper joint is equipped with a piston, and the piston's support section is pressed against the inner wall of the elastic collet. When release is required, a steel ball is inserted into the upper joint to seal the piston, thereby increasing the hydraulic pressure in the upper joint, causing the hydraulic medium to shear the clamping piece. The hydraulic medium then pushes the piston downward, separating the support section from the elastic collet. At this time, the piston's release section is flush with the elastic collet, and the outer diameter of the piston's release section is smaller than the inner diameter of the elastic collet. When the upper joint is pulled to reach the required pulling force for separation, the elastic collet contracts, causing the elastic collet of the upper joint to separate from the lower joint. If this type of release tool is used, the operator needs to lift the upper joint to achieve separation during the release operation. This operation is complex, labor-intensive, and the separation operation takes a long time, resulting in low work efficiency. It is also impossible to quickly and automatically separate the upper and lower joints. In addition, when the mine diameter is small or there are obstacles, the lifting operation may not be possible, thus affecting the separation of the upper and lower joints. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic release tool, which can quickly separate the drill bit from the release tool, is easy to operate, can reduce the labor intensity of workers, and promptly handle drill jam accidents.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A hydraulic release tool is provided, comprising:

[0007] The connecting unit includes a main housing, a first limiting sleeve, and a second limiting sleeve. The main housing defines a connecting passage. One end of the main housing is configured to be connected to a drill rod, and the other end is configured to be connected to a drill bit. The connecting passage is in communication with the drill rod. The first limiting sleeve and the second limiting sleeve are axially spaced apart and disposed within the connecting passage, and both abut against an inner wall of the connecting passage.

[0008] The injection unit is arranged in the connecting channel, and the outer wall of the injection unit and the inner wall of the connecting channel are arranged to form an accommodating chamber. The injection unit includes a first sealing tube, a second sealing tube and an injection assembly. One end of the injection assembly is detachably connected to the first sealing tube, and the other end is detachably connected to the second sealing tube. At least part of the outer wall of the first sealing tube is tightly pressed against the inner wall of the first limiting sleeve, and at least part of the outer wall of the second sealing tube is tightly pressed against the inner wall of the second limiting sleeve. The cross-sectional area of ​​the second sealing tube is smaller than the cross-sectional area of ​​the first limiting sleeve, and the cross-sectional area of ​​the injection assembly is smaller than the cross-sectional area of ​​the connecting channel. The injection assembly is provided with an injection channel, and the output end of the injection channel is arranged on the side of the injection assembly facing the inner wall of the main shell. The first sealing tube is connected to the accommodating chamber through the injection channel, and a first side hole is opened on the side wall of the second sealing tube. The accommodating chamber is connected to the second sealing tube through the first side hole.

[0009] Optionally, the main housing includes a first connecting tube and a second connecting tube that are interconnected, and a conical connector is provided at one end of the first connecting tube close to the second connecting tube. The cross-sectional area of ​​the conical connector is smaller than that of the first connecting tube. The conical connector is inserted into the second connecting tube and is threadedly connected to the inner wall of the second connecting tube. The upper end of the second connecting tube abuts against the lower end of the first connecting tube.

[0010] The first limiting sleeve is arranged in the first connecting cylinder, the second limiting sleeve is arranged in the second connecting cylinder, and the output end of the injection channel is flush with the junction of the tapered connector and the first connecting cylinder.

[0011] Optionally, the first connecting tube is provided with a first step structure, the first limiting sleeve is provided with a first abutting inclined surface, the outer diameter of the first limiting sleeve is the same as the inner diameter of the first connecting tube, and the first abutting inclined surface can be tightly pressed against the upper surface of the first step structure.

[0012] Optionally, the connecting unit further includes a first sealing member, the first limiting sleeve is provided with at least one sealing groove along the circumference, the first sealing member is provided in the sealing groove, and the first sealing member can be in close contact with the inner wall of the first connecting tube.

[0013] Optionally, the connecting unit also includes an abutment ring, the second connecting tube is provided with a second step structure, the abutment ring is provided with a second abutment slope, the outer diameter of the abutment ring is the same as the inner diameter of the second connecting tube, and the second abutment slope can be tightly pressed against the upper surface of the second step structure, one end of the second limiting sleeve is tightly pressed against the upper surface of the abutment ring, and the other end is tightly pressed against one end of the conical connecting head facing the second connecting tube.

[0014] Optionally, the first sealing tube includes a tightening tube body and a sealing tube body, one end of the sealing tube body is threadedly connected to the tightening tube body, and the other end is threadedly connected to the injection assembly, the outer diameter of the tightening tube is the same as the inner diameter of the first limiting sleeve, the outer wall of the tightening tube is pressed against the inner wall of the first limiting sleeve, the outer diameter of the sealing tube body is smaller than the inner diameter of the first limiting sleeve, the sealing tube body is provided with a limiting groove along the circumference, a second sealing member is arranged in the limiting groove, and the upper end of the second sealing member is pressed against the lower end of the tightening tube body.

[0015] Optionally, the injection assembly includes a conversion joint and an injection sleeve, one end of the conversion joint is threadedly connected to the first sealing tube, and the other end is threadedly connected to the second sealing tube, the injection sleeve is sleeved on the conversion joint, the inner wall of the injection sleeve and the outer wall of the conversion joint are arranged to form the injection channel, the conversion joint is provided with a plurality of flow channels along the circumference, the first sealing tube is connected with the injection channel through the flow channel, the injection sleeve is provided with an injection port, the injection channel is connected with the injection port, and the injection port faces the inner wall of the main shell.

[0016] Optionally, the injection sleeve includes a first sleeve section and a second sleeve section, the first sleeve section and the second sleeve section are vertically spaced apart to form the injection port, the first sleeve section is sleeved on one end of the conversion joint close to the first sealing tube, and the injection channel is formed by the inner wall of the first sleeve section and the outer wall of the conversion joint, a limiting protrusion is provided on the conversion joint, the second sleeve section is sleeved on the conversion joint, and one end of the second sleeve section abuts against the limiting protrusion, and the other end abuts against the upper end of the second sealing tube.

[0017] Optionally, the injection unit further includes a tightening bolt, a threaded hole is opened on the side wall of the second sealing tube, the tightening bolt is arranged in the threaded hole, and the tightening bolt can tighten the conversion joint in the radial direction.

[0018] Optionally, the second limiting sleeve includes a first abutting section, a connecting section and a second abutting section which are connected in sequence, the outer wall of the first abutting section and the outer wall of the second abutting section both abut against the inner wall of the connecting channel, the cross-sectional area of ​​the connecting section is smaller than the cross-sectional area of ​​the connecting channel, and the outer wall of the second sealing tube is tightly pressed against at least part of the inner wall of the connecting section; a second side hole and a third side hole are provided on the side wall of the connecting section, the second side hole and the third side hole are arranged vertically at intervals, and the third side hole can be connected with the accommodating cavity through the second side hole.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a hydraulic release tool, comprising a connecting unit and an injection unit. When a drill bit becomes stuck, a release operation is required. The injection unit is placed into the drill pipe, and drilling fluid is simultaneously pumped into the drill pipe, causing the injection unit to gradually move downward until a first sealing tube is tightly pressed against a first limiting sleeve, and a second sealing tube is tightly pressed against a second limiting sleeve. At this point, a connecting channel is partially blocked, increasing the pressure within the connecting channel. After entering the connecting channel, the drilling fluid passes through the first sealing tube into the injection channel, and is then ejected through the injection channel. At this time, the pressure within the connecting channel is relatively high, so the ejected drilling fluid forms a high-pressure jet that is sprayed onto a main housing, continuously cutting the main housing. After a predetermined cutting time, the main housing is severed, cutting off the portion of the main housing connected to the drill bit, thereby releasing the drill bit from the release tool. Furthermore, after cutting the main housing, the injected drilling fluid enters a receiving chamber, then enters the second sealing tube through a first side hole, and flows into the wellbore through the connecting channel.

[0021] By setting the first sealing tube to be pressed against the first limiting sleeve and the second sealing tube to be pressed against the second limiting sleeve, high pressure is formed in the connecting channel, so that the drilling fluid is ejected from the injection channel and a high-pressure jet is formed to cut the main shell, thereby finally separating the drill bit from the release tool. The operation is simple and there is no need for workers to lift the release tool, which can reduce the labor intensity of the workers. The main shell is cut by the high-pressure jet, which can automatically and quickly separate the drill bit from the release tool and deal with drill sticking accidents in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a hydraulic release tool provided by an embodiment of the present utility model;

[0023] Figure 2 This is a schematic structural diagram of a connection unit provided in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic structural diagram of the injection unit provided in an embodiment of the present utility model;

[0025] Figure 4 yes Figure 3 Cross-sectional view at point A;

[0026] Figure 5 yes Figure 3 Enlarged view of point B in the middle.

[0027] In the picture:

[0028] 1. Connecting unit; 11. Main housing; 111. Connecting channel; 112. First connecting cylinder; 113. Second connecting cylinder; 114. Conical connector; 12. First limiting sleeve; 13. Second limiting sleeve; 131. First abutting section; 132. Connecting section; 1321. Second side hole; 1322. Third side hole; 133. Second abutting section; 15. Abutting ring;

[0029] 2. Injection unit; 21. First sealing tube; 211. Clamping tube body; 212. Sealing tube body; 2121. Limiting groove; 213. Second sealing member; 22. Second sealing tube; 221. First side hole; 23. Injection assembly; 231. Adapter; 2311. Flow channel; 2312. Limiting protrusion; 232. Injection sleeve; 2321. Injection port; 2322. First sleeve section; 2323. Second sleeve section; 233. Injection channel;

[0030] 3. Accommodation cavity. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] This embodiment provides a hydraulic release tool, such as Figures 1 to 5 As shown, the hydraulic release tool can quickly separate the drill bit from the release tool, is easy to operate, can reduce the labor intensity of the staff, and promptly handle the drill jam accident.

[0036] like Figures 1 to 3 As shown, the hydraulic release tool includes a connecting unit 1 and an injection unit 2. The connecting unit 1 includes a main shell 11, a first limiting sleeve 12 and a second limiting sleeve 13. The main shell 11 is provided with a connecting channel 111, one end of the main shell 11 is configured to be connected to the drill rod, and the other end is configured to be connected to the drill bit. The connecting channel 111 is interconnected with the drill rod, and the first limiting sleeve 12 and the second limiting sleeve 13 are arranged in the connecting channel 111 along the axial direction and are both in contact with the inner wall of the connecting channel 111. The injection unit 2 is arranged in the connecting channel 111, and the outer wall of the injection unit 2 and the inner wall of the connecting channel 111 are arranged to form a accommodating chamber 3.

[0037] The injection unit 2 includes a first sealing tube 21, a second sealing tube 22 and an injection assembly 23. One end of the injection assembly 23 is detachably connected to the first sealing tube 21, and the other end is detachably connected to the second sealing tube 22. The outer wall of at least part of the first sealing tube 21 is tightly pressed against the inner wall of the first limiting sleeve 12, and the outer wall of at least part of the second sealing tube 22 is tightly pressed against the inner wall of the second limiting sleeve 13. The cross-sectional area of ​​the second sealing tube 22 is smaller than the cross-sectional area of ​​the first limiting sleeve 12, and the cross-sectional area of ​​the injection assembly 23 is smaller than the cross-sectional area of ​​the connecting channel 111. The injection assembly 23 is provided with an injection channel 233, and the output end of the injection channel 233 is provided on the side of the injection assembly 23 facing the inner wall of the main shell 11. The first sealing tube 21 is connected to the accommodating chamber 3 through the injection channel 233, and the side wall of the second sealing tube 22 is provided with a first side hole 221, and the accommodating chamber 3 is connected to the second sealing tube 22 through the first side hole 221.

[0038] When the drill bit is stuck, a release operation is required, and the injection unit 2 is placed in the drill pipe, and drilling fluid is pumped into the drill pipe at the same time, so that the injection unit 2 gradually moves downward until the first sealing tube 21 is tightly pressed against the first limiting sleeve 12, and the second sealing tube 22 is tightly pressed against the second limiting sleeve 13. At this time, the connecting channel 111 will be partially blocked, thereby increasing the pressure in the connecting channel 111. After the drilling fluid enters the connecting channel 111, it will pass through the first sealing tube 21 into the injection channel 233, and then be ejected from the injection channel 233. At this time, the pressure in the connecting channel 111 is relatively high, so the ejected drilling fluid will form a high-pressure jet, which is sprayed on the main shell 11 and continuously cuts the main shell 11. After the predetermined cutting time, the main shell 11 is cut off, so that the main shell 11 connected to the drill bit is cut off, thereby achieving the purpose of disengaging the drill bit from the release tool. In addition, after cutting the main shell 11 , the injected drilling fluid will enter the accommodating chamber 3 , then enter the second sealing tube 22 through the first side hole 221 , and flow into the wellbore through the connecting channel 111 .

[0039] By setting the first sealing tube 21 to be pressed against the first limiting sleeve 12 and the second sealing tube 22 to be pressed against the second limiting sleeve 13, the connecting channel 111 is partially blocked, thereby forming a high pressure in the connecting channel 111, and then the drilling fluid is ejected from the injection channel 233 to form a high-pressure jet for cutting the main shell 11, and finally the drill bit and the hand-release tool are separated. The operation is simple, and there is no need for the staff to lift the hand-release tool, which can reduce the labor intensity of the staff. The main shell 11 is cut by the high-pressure jet, which can automatically and quickly separate the drill bit and the hand-release tool, and timely deal with drill sticking accidents.

[0040] Alternatively, as Figures 1 to 3 As shown, the main housing 11 includes a first connecting tube 112 and a second connecting tube 113 that are interconnected. A conical connector 114 is provided at one end of the first connecting tube 112 close to the second connecting tube 113. The cross-sectional area of ​​the conical connector 114 is smaller than that of the first connecting tube 112. The conical connector 114 is inserted into the second connecting tube 113 and is threadedly connected to the inner wall of the second connecting tube 113. The upper end of the second connecting tube 113 abuts against the lower end of the first connecting tube 112. By providing the conical connector 114, on the one hand, it is convenient to align the first connecting tube 112 and the second connecting tube 113. On the other hand, the conical inclined surface can produce a larger contact area and a tighter fit when the threaded connection is made, thereby dispersing stress, avoiding stress concentration, and enhancing the sealing performance between the first connecting tube 112 and the second connecting tube 113, as well as the connection strength between the first connecting tube 112 and the second connecting tube 113.

[0041] The first limiting sleeve 12 is disposed within the first connecting tube 112, the second limiting sleeve 13 is disposed within the second connecting tube 113, and the output end of the injection channel 233 is flush with the junction of the tapered connector 114 and the first connecting tube 112. After the injection unit 2 is placed within the drill pipe, the drilling fluid is pumped and the injection unit 2 gradually moves downward until the first sealing tube 21 is tightly pressed against the first limiting sleeve 12, and the second sealing tube 22 is tightly pressed against the second limiting sleeve 13. At this point, the output end of the injection channel 233 of the injection assembly 23 is exactly flush with the junction of the tapered connector 114 and the first connecting tube 112. The high-pressure jet ejected from the injection channel 233 cuts the junction of the tapered connector 114 and the first connecting tube 112, thereby achieving rapid separation of the drill bit from the drop tool. The thinner the wall at the junction of the tapered connector 114 and the first connecting tube 112, the easier it is to cut, thus reducing operation time.

[0042] Alternatively, as Figure 1 and Figure 2 As shown, the first connecting tube 112 is provided with a first step structure, and the first limiting sleeve 12 is provided with a first abutting inclined surface. The outer diameter of the first limiting sleeve 12 is the same as the inner diameter of the first connecting tube 112, so that the first limiting sleeve 12 can be clamped in the first connecting tube 112, thereby achieving a tight fit between the first limiting sleeve 12 and the first sealing tube 21. When the first limiting sleeve 12 and the first connecting tube 112 are clamped, the first abutting inclined surface just abuts against the upper surface of the first step structure. By providing the first abutting inclined surface and the first step structure, the connection strength between the first limiting sleeve 12 and the first connecting tube 112 can be strengthened, ensuring the stability of the connection between the two.

[0043] Alternatively, as Figure 1 and Figure 2 As shown, the connection unit 1 also includes a first seal. The first limiting sleeve 12 is provided with at least one sealing groove along the circumference, and a first seal is provided in the sealing groove. When the first limiting sleeve 12 is clamped in the first connecting cylinder 112, the first seal is tightly attached to the inner wall of the first connecting cylinder 112. By providing the first seal, the clamping strength between the first limiting sleeve 12 and the first connecting cylinder 112 can be increased, and the sealing between the two can be enhanced. In addition, the friction between the two can also be increased, thereby ensuring the stability of the position of the first limiting sleeve 12 in the first connecting cylinder 112 and preventing the first limiting sleeve 12 from moving downward.

[0044] In this embodiment, three sealing grooves are provided, and three first sealing members are provided correspondingly. In other embodiments, one, two, or three or more sealing grooves can be provided, and one, two, or three or more first sealing members can be provided correspondingly, depending on actual needs. This is not limited here.

[0045] Exemplarily, the first sealing member comprises a rubber ring.

[0046] Alternatively, as Figure 1 and Figure 2 As shown, the connection unit 1 also includes an abutment ring 15. The second connecting tube 113 is provided with a second step structure, and the abutment ring 15 is provided with a second abutment bevel. The outer diameter of the abutment ring 15 is the same as the inner diameter of the second connecting tube 113, so the abutment ring 15 can be clamped in the second connecting tube 113. At this time, the second abutment bevel is just pressed against the upper surface of the second step structure. Through the cooperation between the second step structure and the second abutment bevel, the clamping strength between the abutment ring 15 and the second connecting tube 113 can be guaranteed, and the stability of the structure can be guaranteed. One end of the second limiting sleeve 13 is pressed against the upper surface of the abutment ring 15, and the other end is pressed against the end of the tapered connector 114 facing the second connecting tube 113, that is, the second limiting sleeve 13 is clamped between the abutment ring 15 and the tapered connector 114, preventing the second limiting sleeve 13 from moving downward, thereby ensuring the tightening effect between the second limiting sleeve 13 and the second connecting tube 113.

[0047] Alternatively, as Figures 1 to 3 As shown, the first sealing tube 21 includes a tightening tube body 211 and a sealing tube body 212. One end of the sealing tube body 212 is threadedly connected to the tightening tube body 211, and the other end is threadedly connected to the injection assembly 23. The outer diameter of the tightening tube is the same as the inner diameter of the first limiting sleeve 12, the outer wall of the tightening tube is pressed against the inner wall of the first limiting sleeve 12, and the outer diameter of the sealing tube body 212 is smaller than the inner diameter of the first limiting sleeve 12. When the injection unit 2 enters the connection unit 1, the sealing tube body 212 can pass through the first limiting sleeve 12 smoothly. The sealing tube body 212 is provided with a limiting groove 2121 along the circumference, and a second sealing member 213 is provided in the limiting groove 2121. The upper end of the second sealing member 213 is pressed against the lower end of the tightening tube body 211. By providing the second sealing member 213, the tightness of the connection between the tightening tube body 211 and the sealing tube body 212 can be increased, and the friction between the two can be increased, thereby maintaining the stability of the connection between the two. In addition, when the spray unit 2 receives external force, it can absorb the impact force and prevent the pressing tube body 211 and the sealing tube body 212 from falling off and separating.

[0048] Exemplarily, the second sealing member 213 includes a rubber ring.

[0049] Alternatively, as Figures 1 to 3 As shown, the injection assembly 23 includes a conversion joint 231 and an injection sleeve 232. One end of the conversion joint 231 is threadedly connected to the first sealing tube 21, and the other end is threadedly connected to the second sealing tube 22. The injection sleeve 232 is sleeved on the conversion joint 231, and the inner wall of the injection sleeve 232 and the outer wall of the conversion joint 231 are surrounded to form an injection channel 233. The conversion joint 231 is provided with a plurality of flow channels 2311 along the circumference (see Figure 4), the first sealing tube 21 is connected to the injection channel 233 through the flow channel 2311. The injection sleeve 232 is provided with an injection port 2321 (see Figure 5 ), the injection channel 233 is connected to the injection port 2321, and the injection port 2321 faces the inner wall of the main housing 11. When the first sealing tube 21 is tightly pressed against the first limiting sleeve 12, and the second sealing tube 22 is tightly pressed against the second limiting sleeve 13, the connecting channel 111 will be partially blocked. As the drilling fluid continues to be pumped in, high pressure is generated in the connecting channel 111. At this time, the drilling fluid in the connecting channel 111 will enter the first sealing tube 21, then enter the injection channel 233 through the flow channel 2311, and finally be ejected from the injection port 2321 and sprayed onto the inner wall of the main housing 11. The ejected drilling fluid forms a high-pressure jet under high pressure conditions. Under the cutting action of the high-pressure jet, after a predetermined cutting time, the main housing 11 is cut off, so that the main housing 11 connected to the drill bit is cut off, thereby achieving the purpose of disengaging the drill bit from the hand-free tool.

[0050] It should be noted that the predetermined time is determined by conditions such as the wall thickness of the main shell 11 and the speed of the high-pressure jet in actual engineering.

[0051] In this embodiment, three flow channels 2311 are provided. In other embodiments, one, two, or more than three flow channels 2311 may be provided according to actual needs, which is not limited here.

[0052] Alternatively, as Figure 1 and Figure 3 As shown, the injection sleeve 232 includes a first sleeve section 2322 and a second sleeve section 2323. The first sleeve section 2322 and the second sleeve section 2323 are arranged vertically spaced apart to form an injection port 2321 (see Figure 5 The first sleeve section 2322 is sleeved on one end of the conversion joint 231 close to the first sealing tube 21, and the inner wall of the first sleeve section 2322 and the outer wall of the conversion joint 231 form an injection channel 233 (see Figure 5A limiting protrusion 2312 is provided on the conversion joint 231 , and the second sleeve section 2323 is sleeved on the conversion joint 231 , with one end of the second sleeve section 2323 abutting against the limiting protrusion 2312 and the other end abutting against the upper end of the second sealing tube 22 . Under the action of gravity, when the drilling fluid has not entered the injection channel 233, the first casing section 2322 and the second casing section 2323 abut against each other. At this time, the injection assembly 23 has no injection port 2321. When the drilling fluid enters the injection channel 233, the drilling fluid will impact the first casing section 2322 and the second casing section 2323. Under the action of the limiting protrusion 2312, the second casing section 2323 remains stationary, and under the impact of the drilling fluid, the first casing section 2322 will have an upward movement trend, so that the first casing section 2322 and the second casing section 2323 are separated to form the injection port 2321. Finally, the drilling fluid is ejected from the injection port 2321. The injection port 2321 is smaller, thereby further increasing the injection speed of the drilling fluid and increasing its cutting ability.

[0053] Optionally, the spray unit 2 further includes a tightening bolt. A threaded hole is defined in the sidewall of the second sealing tube 22, and the tightening bolt is disposed within the threaded hole. The tightening bolt is capable of radially tightening the adapter 231. The tightening bolt is disposed within the threaded hole, i.e., threadedly connected to the threaded hole, thereby tightening the tightening bolt against the adapter 231. This strengthens the connection between the adapter 231 and the second sealing tube 22, preventing separation and ensuring overall tool stability.

[0054] like Figures 1 to 3 As shown, the second limiting sleeve 13 includes a first abutting section 131, a connecting section 132, and a second abutting section 133, which are connected in sequence. The outer wall of the first abutting section 131 and the outer wall of the second abutting section 133 both abut against the inner wall of the connecting channel 111. The cross-sectional area of ​​the connecting section 132 is smaller than the cross-sectional area of ​​the connecting channel 111. The outer wall of the second sealing tube 22 is tightly pressed against at least a portion of the inner wall of the connecting section 132. A second side hole 1321 and a third side hole 1322 are formed on the side wall of the connecting section 132. The second side hole 1321 and the third side hole 1322 are vertically spaced apart. The third side hole 1322 can communicate with the accommodating chamber 3 through the second side hole 1321. After the drilling fluid is sprayed into the main shell 11, the drilling fluid enters the accommodating chamber 3, and then part of the drilling fluid enters the second sealing tube 22 through the first side hole 221, and flows into the wellbore through the connecting channel 111. Another part of the drilling fluid enters between the connecting section 132 and the connecting channel 111 through the second side hole 1321, and then enters the second limiting sleeve 13 through the third side hole 1322, and flows into the wellbore through the connecting channel 111.

[0055] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A hydraulic release tool, characterized in that: include: A connecting unit (1) comprises a main housing (11), a first limiting sleeve (12) and a second limiting sleeve (13); the main housing (11) is provided with a connecting channel (111); one end of the main housing (11) is configured to be connected to a drill rod, and the other end is configured to be connected to a drill bit; the connecting channel (111) and the drill rod are in communication with each other; the first limiting sleeve (12) and the second limiting sleeve (13) are arranged in the connecting channel (111) at intervals along the axial direction, and both abut against the inner wall of the connecting channel (111); The spray unit (2) is arranged in the connecting channel (111), and the outer wall of the spray unit (2) and the inner wall of the connecting channel (111) are surrounded to form a receiving chamber (3). The spray unit (2) includes a first sealing tube (21), a second sealing tube (22) and a spray assembly (23). One end of the spray assembly (23) is detachably connected to the first sealing tube (21), and the other end is detachably connected to the second sealing tube (22). At least a portion of the outer wall of the first sealing tube (21) is tightly pressed against the inner wall of the first limiting sleeve (12), and at least a portion of the outer wall of the second sealing tube (22) is tightly pressed against the inner wall of the second limiting sleeve (13). The second The cross-sectional area of ​​the sealing tube (22) is smaller than the cross-sectional area of ​​the first limiting sleeve (12); the cross-sectional area of ​​the injection assembly (23) is smaller than the cross-sectional area of ​​the connecting channel (111); the injection assembly (23) is provided with an injection channel (233); the output end of the injection channel (233) is provided on the side of the injection assembly (23) facing the inner wall of the main shell (11); the first sealing tube (21) is communicated with the accommodating chamber (3) through the injection channel (233); the side wall of the second sealing tube (22) is provided with a first side hole (221); the accommodating chamber (3) is communicated with the second sealing tube (22) through the first side hole (221).

2. The hydraulic release tool according to claim 1, characterized in that: The main housing (11) includes a first connecting tube (112) and a second connecting tube (113) that are interconnected. A conical connecting head (114) is provided at one end of the first connecting tube (112) close to the second connecting tube (113). The cross-sectional area of ​​the conical connecting head (114) is smaller than the cross-sectional area of ​​the first connecting tube (112). The conical connecting head (114) is inserted into the second connecting tube (113) and is threadedly connected to the inner wall of the second connecting tube (113). The upper end of the second connecting tube (113) abuts against the lower end of the first connecting tube (112). The first limiting sleeve (12) is arranged in the first connecting tube (112), the second limiting sleeve (13) is arranged in the second connecting tube (113), and the output end of the injection channel (233) is flush with the junction of the conical connector (114) and the first connecting tube (112).

3. The hydraulic releasing tool according to claim 2, characterized in that: The first connecting tube (112) is provided with a first step structure, the first limiting sleeve (12) is provided with a first abutting inclined surface, the outer diameter of the first limiting sleeve (12) is the same as the inner diameter of the first connecting tube (112), and the first abutting inclined surface can be tightly abutted against the upper surface of the first step structure.

4. The hydraulic releasing tool according to claim 3, characterized in that: The connecting unit (1) further comprises a first sealing member, the first limiting sleeve (12) is provided with at least one sealing groove along the circumference, the first sealing member is arranged in the sealing groove, and the first sealing member can be in close contact with the inner wall of the first connecting tube (112).

5. The hydraulic releasing tool according to claim 2, characterized in that: The connecting unit (1) further includes an abutment ring (15), the second connecting tube (113) is provided with a second step structure, the abutment ring (15) is provided with a second abutment slope, the outer diameter of the abutment ring (15) is the same as the inner diameter of the second connecting tube (113), and the second abutment slope can be pressed against the upper surface of the second step structure, one end of the second limiting sleeve (13) is pressed against the upper surface of the abutment ring (15), and the other end is pressed against one end of the conical connector (114) facing the second connecting tube (113).

6. The hydraulic releasing tool according to any one of claims 1 to 5, characterized in that: The first sealing tube (21) comprises a tightening tube body (211) and a sealing tube body (212), one end of the sealing tube body (212) is threadedly connected to the tightening tube body (211), and the other end is threadedly connected to the injection assembly (23), the outer diameter of the tightening tube is the same as the inner diameter of the first limiting sleeve (12), the outer wall of the tightening tube is pressed against the inner wall of the first limiting sleeve (12), the outer diameter of the sealing tube body (212) is smaller than the inner diameter of the first limiting sleeve (12), the sealing tube body (212) is provided with a limiting groove (2121) along the circumferential direction, a second sealing member (213) is arranged in the limiting groove (2121), and the upper end of the second sealing member (213) is pressed against the lower end of the tightening tube body (211).

7. The hydraulic releasing tool according to any one of claims 1 to 5, characterized in that: The injection assembly (23) comprises a conversion joint (231) and an injection sleeve (232), one end of the conversion joint (231) is threadedly connected to the first sealing tube (21), and the other end is threadedly connected to the second sealing tube (22), the injection sleeve (232) is sleeved on the conversion joint (231), the inner wall of the injection sleeve (232) and the outer wall of the conversion joint (231) are arranged to form the injection channel (233), the conversion joint (231) is provided with a plurality of flow channels (2311) along the circumference, the first sealing tube (21) is communicated with the injection channel (233) through the flow channels (2311), the injection sleeve (232) is provided with an injection port (2321), the injection channel (233) is communicated with the injection port (2321), and the injection port (2321) faces the inner wall of the main shell (11).

8. The hydraulic releasing tool according to claim 7, characterized in that: The injection sleeve (232) comprises a first sleeve section (2322) and a second sleeve section (2323). The first sleeve section (2322) and the second sleeve section (2323) are arranged at intervals in the vertical direction to form the injection port (2321). The first sleeve section (2322) is sleeved on one end of the conversion joint (231) close to the first sealing tube (21). The injection channel (233) is formed by the inner wall of the first sleeve section (2322) and the outer wall of the conversion joint (231). A limiting protrusion (2312) is provided on the conversion joint (231). The second sleeve section (2323) is sleeved on the conversion joint (231), and one end of the second sleeve section (2323) abuts against the limiting protrusion (2312), and the other end abuts against the upper end of the second sealing tube (22).

9. The hydraulic releasing tool according to claim 7, characterized in that: The injection unit (2) further comprises a tightening bolt, a threaded hole is provided on the side wall of the second sealing tube (22), the tightening bolt is arranged in the threaded hole, and the tightening bolt can tighten the conversion joint (231) in the radial direction.

10. The hydraulic releasing tool according to any one of claims 1 to 5, characterized in that: The second limiting sleeve (13) includes a first abutting section (131), a connecting section (132) and a second abutting section (133) which are connected in sequence. The outer wall of the first abutting section (131) and the outer wall of the second abutting section (133) are both in abutment with the inner wall of the connecting channel (111). The cross-sectional area of ​​the connecting section (132) is smaller than the cross-sectional area of ​​the connecting channel (111). The outer wall of the second sealing tube (22) is pressed against at least part of the inner wall of the connecting section (132). A second side hole (1321) and a third side hole (1322) are provided on the side wall of the connecting section (132). The second side hole (1321) and the third side hole (1322) are arranged at intervals in the vertical direction. The third side hole (1322) can be connected with the accommodating cavity (3) through the second side hole (1321).

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