Vibration inverted buckle type safety joint

Abstract

The utility model relates to a safety joint, in particular to a vibration reverse buckle type safety joint used in the fishing reverse buckle operation process. The utility model provides a shock reverse buckle type safety joint which comprises a shock reverse buckle type safety joint inner spear rod and a shock reverse buckle type safety joint upper barrel, a key groove matching structure used for being matched with a shock key of the shock reverse buckle type safety joint upper barrel is arranged on the peripheral face of the rod body, and the key groove matching structure comprises a vertical key way. The inclined key way is arranged on the peripheral surface of the rod body and is positioned on the lower side of the vertical key way; and a key position cavity for accommodating the vibration key is arranged at the tail end of the inclined key way. According to the vibration inverted buckle type safety connector, longitudinal force generated during vibration is utilized, the longitudinal force is converted into transverse force through the vibration inverted buckle type safety connector, the vibration inverted buckle type safety connector can rotate in the relative circumferential direction, transverse torque is generated, back-off can be powerfully assisted, and the problem that back-off is difficult is solved.

Description

Technical Field

[0001] The utility model relates to a safety joint, in particular to a shock-shocked undercut type safety joint used in the process of salvaging undercut operations. Background Art

[0002] In the process of oil and water well maintenance, how to salvage fallen objects, solve the problem of thread jamming and the complicated maintenance of the well pipe string has always been a global problem. In the past salvage construction, because the well pipe string is affected by the environment inside the casing, it is usually necessary to perform multiple salvage operations to achieve the purpose of salvaging fallen objects.

[0003] In the prior art, the main methods of undercutting used in the maintenance of oil and water wells are: overhauling with a turntable to achieve undercutting, and minor repairs with a top drive device to achieve salvage and undercutting. However, because the drill pipe is easily affected by the flexible consumption, the friction resistance of the inclined section in the well, the friction resistance between the drill pipe and the well wall, and the friction resistance of the environment in the sand and scale bridge, the ground torque cannot be ideally transmitted to the falling thread. If the ground continues to apply pressure to increase the torque at this time, it will easily cause the drill pipe to be damaged, so that it is often difficult to achieve the undercut operation and forced to release from the safety joint. Utility Model Content

[0004] The utility model aims to provide a shock-type reverse buckle safety joint to solve the problem that the threads are tight due to corrosion and scaling of fallen objects in the well, which often occurs during the salvage operation in the well, making it difficult to achieve reverse buckle operation.

[0005] In order to solve the above problems, the utility model provides a shocking buckle safety joint, including a shocking buckle safety joint inner lance rod and a shocking buckle safety joint upper cylinder, wherein a keyway matching structure is provided between the shocking buckle safety joint inner lance rod and the shocking buckle safety joint upper cylinder, wherein the keyway matching structure includes a shock key arranged on the inner wall of the shocking buckle safety joint upper cylinder, and a vertical keyway arranged on the shocking buckle safety joint inner lance rod and matching with the shock key, wherein the keyway matching structure also includes an inclined keyway arranged on the outer peripheral surface of the safety joint inner lance rod and located below the vertical keyway, and a key position cavity for accommodating the shock key is provided at the end of the inclined keyway. The two side walls of the inclined keyway are respectively connected to the two side walls of the vertical keyway, and the two side walls of the inclined keyway are both extended obliquely to one side of the circumference, so as to hit the lower side wall of the inclined keyway during the downward movement of the shock key, thereby realizing a lateral impact on the inner lance rod.

[0006] Furthermore, the lower side wall of the inclined keyway is an impact inclined surface.

[0007] Furthermore, the upper side wall of the inclined keyway is an anti-hanging inclined surface.

[0008] Preferably, the lower end of the shock key has an impact arc surface corresponding to the lower side wall of the inclined keyway.

[0009] Preferably, the lower end surface of the shock key is an overall curved surface structure.

[0010] Preferably, the key position cavity has vertical cavity walls that are opposite to each other in the circumferential direction.

[0011] Furthermore, an L-shaped sliding keyway having an axial extension section and a circumferential extension section is provided on the outer circumferential surface of the inner lance rod, and the end of the circumferential extension section of the L-shaped sliding keyway is connected to the middle of the vertical keyway.

[0012] Preferably, the circumferential extension section of the L-shaped slide-in keyway is axially arranged corresponding to the key position cavity and the inclined keyway.

[0013] Preferably, the keyway matching structures are arranged in more than two groups and are evenly distributed in the circumferential direction.

[0014] The utility model improves the existing safety joint. The beneficial effect of the shock-type buckle safety joint is that the existing keyway matching structure composed of a key and a vertical keyway that can only perform longitudinal movement is improved into a keyway matching structure between an inner lance rod of the shock-type buckle safety joint and an upper cylinder of the shock-type buckle safety joint, which includes a shock key, a vertical keyway, an inclined keyway and a key position cavity. After the shock key in the keyway matching structure hits the lower side wall of the inclined keyway, it slides downward along the side wall until it falls into the key position cavity and generates a downward displacement, so that the inner lance rod and the upper cylinder can perform relative circumferential rotation, so that when the longitudinal movement is converted into a lateral movement, the inner lance rod and the upper cylinder can rotate relative to each other. The longitudinal force is converted into lateral torque, which has a simple structure and is easy to process. It can also reduce the situation where the ground torque cannot be ideally transmitted to the falling thread due to the influence of factors such as the flexible consumption of the drill pipe, the friction resistance of the inclined section in the well, the friction resistance between the drill pipe and the well wall, and the friction resistance of the environment in the sand and scale bridge, thereby improving construction efficiency and reducing construction period. It can also reduce the damage to the drill pipe in the well caused by the forced application of torque on the ground when it is impossible to reverse the thread, thereby increasing the safety factor of construction. It avoids the situation where the original safety joint needs to be released after being re-milled and repeatedly fished out, thereby solving the problem of wasting manpower and material resources. It can be seen that the shock reverse thread safety joint of the utility model is simple to operate and has strong feasibility.

[0015] In addition, the type of shock-type inverted safety joint of the utility model can be selected according to the needs of the operation scene, which opens up a new idea for the application of salvage and inverted technology and has broad promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of the upper cylinder of Example 1 of the shock-type buckle safety joint of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the inner lance rod of Example 1 of the shock buckle safety joint of the utility model;

[0018] Figure 3 It is a schematic diagram of the working process of Example 1 of the shock-type buckle safety joint of the utility model.

[0019] In the figure: 1. limit key; 2. vertical keyway; 3. anti-hanging inclined surface; 4. impact inclined surface; 5. key position cavity; 6. shock key; 7. inclined keyway; 8. L-shaped sliding keyway. DETAILED DESCRIPTION

[0020] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0021] During drilling operations, as the depth increases, the tubing is easily affected by various factors, such as the tubing getting stuck due to friction resistance; the drill pipe being damaged in unexpected situations, etc., which makes it impossible to reverse the drill pipe to release the jam. It is necessary to apply pressure on the tubing from the ground to provide torque for reverse release. If part of the longitudinal force can be converted into lateral torque at this time, it will be able to effectively assist reverse release.

[0022] The utility model is a shock buckle safety joint improved by reasonable design using the above technical concept. The shock buckle safety joint is composed of an inner lance rod of the shock buckle safety joint and an upper cylinder of the shock buckle safety joint. When the inner lance rod is connected to the upper cylinder, the shock key 6 slides from the L-shaped sliding keyway 8 into the keyway matching mechanism. A keyway matching structure is arranged between the inner lance rod of the shock buckle safety joint and the upper cylinder of the shock buckle safety joint. The keyway matching structure includes a shock key 6 on the inner wall of the upper cylinder of the shock buckle safety joint, a vertical keyway 2 arranged on the inner lance rod of the shock buckle safety joint and matching with the shock key 6, an inclined keyway 7 on the outer peripheral surface of the inner lance rod of the shock buckle safety joint located below the vertical keyway 2, and a key position cavity 5 located at the end of the inclined keyway 7 for accommodating the shock key 6. The vertical keyway 2 is surrounded by a limit key 1 arranged on the outer peripheral surface of the inner lance rod.

[0023] like Figure 3As shown, the keyway matching structure is used for applying torque to the pipe column on the ground and shocking downwards, so that the inner lance rod of the shock inverted safety joint and the upper cylinder of the shock inverted safety joint can perform relative longitudinal movement, so that the shock key 6 of the upper cylinder of the shock inverted safety joint slides downwards close to the side wall of the dorsal inclined keyway 7 of the vertical keyway 2. When shocking downwards, the shock key 6 will hit the lower side wall of the inclined keyway 7 connected to the vertical keyway 2, and then the shock key 6 will slide downwards along the side wall and fall into the key position cavity 5 at the end of the inclined keyway 7, and move along the key position cavity The cavity wall of 5 is displaced downward, and this process can make the lance rod inside the shock inverted safety joint receive a lateral force, so that the lance rod inside the shock inverted safety joint and the upper cylinder of the shock inverted safety joint rotate relative to each other at a certain angle in the lateral direction, and generate a lateral torque at the same time, so as to achieve the purpose of effectively assisting the inverted buckle; then the shock key 6 will slide upward along the vertical key wall connected to the upper side wall of the key position cavity 5 and the inclined keyway 7 and the upper side wall of the inclined keyway 7 connected to the vertical keyway 2 during the upward pulling process, until it returns to the initial position when the shock key 6 starts to shock downward. The above design of the utility model can basically ensure that the above process is repeated and circulated continuously, so as to achieve the effect of loosening the tight thread and effectively assisting the inverted buckle.

[0024] In summary, other mechanisms that can achieve similar or identical working principles and working effects as the keyway matching mechanism also belong to the contribution of the present invention to the prior art and also fall within the scope of protection required by the present invention.

[0025] Based on the above main concepts, different embodiments are provided below for illustration.

[0026] Specific implementation method 1, in this embodiment Figure 2 As shown, the shock-type inverted safety joint uses an H-type safety joint and improves it into a shock-type inverted H-type safety joint, that is, an L-shaped sliding keyway 8 having an axial extension section and a circumferential extension section is provided on the outer peripheral surface of the rod body of the inner spear rod, and the end of the circumferential extension section of the L-shaped sliding keyway 8 is connected to the middle part of the vertical keyway. Such a structure can make the operation of connecting the upper cylinder and the inner spear rod simpler and the action process more convenient. On the basis of the above embodiment, the utility model also provides another embodiment, in which the L-shaped sliding keyway 8 can be changed to a spiral sliding keyway.

[0027] In this embodiment, Figure 1 The shock key 6 shown in the figure, the contact part between the shock key 6 on the inner wall of the upper cylinder of the shock inverted safety joint and the corresponding lower wall of the inclined keyway 7 is set as an arc surface structure, that is, forming an impact arc surface. For better effect, the lower end surface of the shock key 6 is set as an arc surface structure as a whole. Such a structure can prevent stress concentration on the shock key 6 during shock, reduce the wear of the shock key 6, and help protect the shock key 6.

[0028] In this embodiment, Figure 2 The inclined keyway structure shown in the figure has two side walls of the inclined keyway 7, respectively, an anti-hanging inclined surface 3 and an impact inclined surface 4, wherein the anti-hanging inclined surface 3 and the impact inclined surface 4 are set as oblique straight surfaces, mainly to prevent excessive force dispersion when the shock key 6 hits the impact inclined surface 4 downward, so as to minimize the loss of kinetic energy and potential energy; and to ensure that the shock key 6 can smoothly return to the vertical keyway 2 along the anti-hanging inclined surface 3 when it is pulled upward, so as to prevent the shock key 6 from getting hooked during the upward pulling process. The utility model also provides another embodiment, in which the two side key walls of the inclined keyway 7 can also be set as concave arc surfaces.

[0029] After the shock key 6 strikes the impact inclined surface 4 downward, it will reach the key position cavity 5 at the end of the inclined keyway 7 along the impact inclined surface 4. Figure 2 As shown, the cavity wall of the key cavity 5 is set as a vertical cavity wall. Such a structure can limit the circumferential movement of the shock key 6 in the key cavity 5 when the shock key 6 moves downward along the vertical cavity wall of the key cavity 5, so that the side wall of the shock key 6 can stick to the vertical cavity wall of the key cavity 5 during the reverse operation. Therefore, after the inner lance rod of the shock reverse safety joint is subjected to a lateral force, the inner lance rod of the shock reverse safety joint and the upper cylinder of the shock reverse safety joint rotate relative to each other at a certain angle in the lateral direction and generate a lateral torque, so that the stuck thread can be better cooperated with the rotation to untie, thereby achieving the purpose of effectively assisting reverse operation.

[0030] In this embodiment, Figure 2 As shown, the circumferential extension of the L-shaped sliding keyway 8 is arranged axially corresponding to the key position cavity 5 and the inclined keyway 7, so that the shock key 6 is not easy to withdraw from the L-shaped sliding keyway 8 during the relative movement of the upper cylinder and the inner spear rod. Of course, in some other embodiments, the key position cavity 5 and the circumferential extension of the L-shaped sliding keyway 8 can also be staggered in the axial direction, for example, the inclined keyway 7 extends to the side of the vertical keyway 2 that is away from the sliding keyway 8, and the key position cavity 5 and the circumferential extension of the L-shaped sliding keyway 8 are on both sides of the circumference of the vertical keyway 2.

[0031] In this embodiment, two keyway matching structures are provided, which can improve the force effect and reduce stress concentration. Of course, in other embodiments, the number of the keyway matching structures can be set to be more or less.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shock-type buckle safety joint, comprising an inner lance rod and an upper cylinder, wherein a keyway matching structure is provided between the inner lance rod and the upper cylinder, wherein the keyway matching structure comprises a shock key provided on the inner side wall of the upper cylinder, and a vertical keyway provided on the inner lance rod, wherein: The keyway matching structure also includes an inclined keyway arranged on the outer peripheral surface of the inner lance rod of the safety joint and located at the lower side of the vertical keyway. The two side walls of the inclined keyway are respectively connected to the two side walls of the vertical keyway. The two side walls of the inclined keyway extend obliquely to one side of the circumference so as to hit the lower side wall of the inclined keyway during the downward movement of the shock key to achieve a lateral impact on the inner lance rod, and a key position cavity for accommodating the shock key is provided at the end of the inclined keyway.

2. The shock-type buckle safety joint according to claim 1, characterized in that: The lower side wall of the inclined keyway is an impact inclined surface.

3. The shock-type buckle safety joint according to claim 1, characterized in that: The upper side wall of the inclined keyway is an anti-hanging inclined surface.

4. The shock-type buckle safety joint according to any one of claims 1 to 3, characterized in that: The lower end of the shock key has an impact arc surface corresponding to the lower side wall of the inclined keyway.

5. The shock-type buckle safety joint according to claim 4, characterized in that: The lower end surface of the shock key is an overall curved surface structure.

6. The shock-type buckle safety joint according to any one of claims 1 to 3, characterized in that: The key position cavity has vertical cavity walls which are opposite to each other in the circumferential direction.

7. The shock-type buckle safety joint according to any one of claims 1 to 3, characterized in that: An L-shaped sliding keyway having an axial extension section and a circumferential extension section is arranged on the outer peripheral surface of the inner lance rod, and the end of the circumferential extension section of the L-shaped sliding keyway is connected to the middle part of the vertical keyway.

8. The shock-type buckle safety joint according to claim 7, characterized in that: The circumferential extension section of the L-shaped slide-in keyway is axially arranged corresponding to the key position cavity and the inclined keyway.

9. The shock-type buckle safety joint according to any one of claims 1 to 3, characterized in that: The keyway matching structures are arranged in more than two groups and are evenly distributed in the circumferential direction.

Images