Mechanical disc spring type double-jarring intensifier for jar and jarring method
By installing a mechanical disc spring double shock reinforcer on the shock absorber, the structure of the disc spring and release tile is used to achieve double shock, which solves the problem that the drilling tool cannot unblock due to large friction resistance in large incline wells and horizontal wells, and improves the shock force and safety of drilling construction.
Patent Information
- Application Number
- CN202311598541.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-05-30
AI Technical Summary
During drilling, especially in large slope wells and horizontal wells, due to the large friction resistance of the drilling tool in the hole, the shock absorber cannot start normally or the starting force is small, so it cannot effectively unblock.
A mechanical disc spring-type double shock reinforcer for shock absorbers is adopted, which includes an upper joint, a transition body, a disc spring, an outer caliper, a release caliper, a release caliper, a shock head, a body, a shock body and a lower caliper. Through the design of this reinforcer, the compression energy of the disc spring and the meshing structure of the release of the tile can be used to achieve double shock and enhance the shock force.
This reinforcer can achieve greater shock force under a smaller starting force, effectively solving the problem that the drilling tool cannot be unblocked after being stuck and improves the safety and efficiency of drilling construction.
Smart Images
Figure CN120061733A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of drilling tools for the petroleum industry, and particularly to a mechanical disc spring type double shock intensifier for a shock absorber and a shock method. Background Art
[0002] After sticking occurs during the drilling process, a shock absorber is required for sticking releasing operation. Mainly by pulling up or pressing down the drill string to force the drill string above the sticking point to elastically elongate or compress and then suddenly release, and using the elastic potential energy of the drill string to impact the sticking point. Existing shock accelerators are mainly used to provide an additional powerful boost when releasing the drill string, increasing the elastic potential energy of the drill string. When the elastic amount of the drill string is large or the well is deep, shock accelerators are generally rarely used. At the same time, during deep well construction, generally one shock is achieved by one lifting, and the magnitude of the shock force depends on the starting force of the shock absorber. If the starting force is too large, it cannot be normally started due to excessive friction in large inclination wells or horizontal wells. If the shock starting force is too small, there is a risk of inability to release the stuck. Summary of the Invention
[0003] The present invention provides a mechanical disc spring type double shock intensifier for a shock absorber and a shock method to solve the problem in the prior art that after the drill string gets stuck, especially in large inclination wells and horizontal wells, when shock is required, due to too large frictional resistance of the drill string in the well, the shock absorber cannot be started, or the starting force is small, and the shock force acting on the lower drill string is also small, resulting in inability to release the stuck drill string.
[0004] In order to alleviate the above technical problems, the technical solution provided by the present invention lies in:
[0005] In a first aspect, the present invention provides a mechanical disc spring type double shock intensifier for a shock absorber, including: an upper sub, a transition body, disc springs, an outer slip, a release slip, a release mandrel, a shock head, a body, a shock body, and a lower sub;
[0006] The upper sub, the transition body, and the body are connected in sequence from top to bottom, and the upper sub is used for connecting with the upper drill string;
[0007] The outer slip is connected with the body;
[0008] The release mandrel is arranged inside the body, the release slip is arranged between the release mandrel and the outer slip, the engaging teeth arranged on the side of the release slip close to the release mandrel are meshed and connected with the release mandrel, and the engaging teeth arranged on the side of the release slip close to the outer slip are opposite to the tooth tops of the engaging teeth arranged on the outer slip;
[0009] The disc springs are arranged above the outer slip and make the outer slip have a tendency to move away from the transition body;
[0010] The shock head is connected to the lower part of the release mandrel, the lower sub is connected to the lower part of the shock head, and the lower part of the lower sub is used to connect to the jar.
[0011] The shock body is connected to the lower part of the body, and there is a spacing between the top of the shock body and the bottom of the shock head to form a shock stroke.
[0012] When stuck pipe releasing is required, lift the upper drill string to the starting force of the jar. The lifting force generated by lifting the upper drill string is less than the starting force threshold of the mechanical disc spring type double shock intensifier for the jar, and the lifting force generated by the shock action of the jar is greater than the starting force threshold of the mechanical disc spring type double shock intensifier for the jar.
[0013] In an alternative embodiment,
[0014] The body extends inwards with a step, and the lower part of the external slip is connected to the step.
[0015] In an alternative embodiment,
[0016] It further includes a locking plug;
[0017] The locking plug is connected to the top of the disc spring, and the upper end of the locking plug is connected to the transition body.
[0018] In an alternative embodiment,
[0019] It further includes a balance piston and an upper mandrel;
[0020] The balance piston is arranged in the transition body and sleeved on the upper mandrel;
[0021] The lower part of the upper mandrel is connected to the release mandrel.
[0022] In an alternative embodiment,
[0023] An upper annulus is formed between the balance piston and the upper mandrel above, and drilling fluid is provided in the upper annulus.
[0024] In an alternative embodiment,
[0025] A lower annulus is formed between the balance piston and the upper mandrel below, and hydraulic oil is provided in the lower annulus.
[0026] In an alternative embodiment,
[0027] An upper oil injection port is provided on the transition body, and hydraulic oil enters the lower annulus through the upper oil injection port.
[0028] In an alternative embodiment,
[0029] A spline groove is provided at the lower part of the shock body, a spline body is provided on the lower sub, and the spline body can extend into the spline groove.
[0030] In an alternative embodiment,
[0031] A lower oil injection port is formed on the shock body, and hydraulic oil enters the spline groove through the lower oil injection port.
[0032] In a second aspect, the present invention provides a shock method using the mechanical disc spring type double shock intensifier for a shock absorber, comprising the following steps:
[0033] Connect the mechanical disc spring type double shock intensifier for a shock absorber to the upper part of the shock absorber, and set the shock starting force on the ground;
[0034] When the drill string gets stuck and shock is required to release the stuck, lift the drill string to the shock starting force of the shock absorber. At this time, the shock absorber starts to achieve the first shock;
[0035] The upward force generated by the shock action of the shock absorber acts on the body, driving the outer slip to move upward, compressing the disc spring, releasing the engagement between the slip and the outer slip, and disengaging the release slip from the release mandrel. At this time, the body drives the shock body to move upward, and the upper part of the shock body impacts the lower part of the shock head to achieve the second shock.
[0036] The beneficial effects of the mechanical disc spring type double shock intensifier for a shock absorber in the present invention are analyzed as follows:
[0037] The mechanical disc spring type double shock intensifier for a shock absorber provided by the present invention is connected above the shock absorber and below the upper drill string. When shock unlocking is not required, the intensifier and the shock absorber can be used as a conventional drill string for normal construction. The release slip engages with the release mandrel, and the upper part of the external slip is pressed by the disc spring. At the same time, the engaging teeth of the release slip and the external slip are opposite to the tooth tips, so as to lock the release slip and the release mandrel together. When shock unlocking is required, the drill string is lifted to the starting force of the shock absorber, and the shock absorber starts to achieve the first shock. Since the lifting force generated by lifting the upper drill string is less than the starting force threshold of the intensifier, the intensifier will not start when the drill string is lifted; the lifting force generated by the shock action acts on the body. Since the lifting force generated by the shock action of the shock absorber is greater than the starting force threshold of the intensifier, the body drives the external slip to move upward, compressing the disc spring. When it moves upward to the set distance, the release slip engages with the external slip and disengages from the release mandrel. At this time, the body drives the shock body to move upward rapidly, and the upper part of the shock body impacts the lower part of the shock head to achieve the second shock. By using this intensifier, a large shock force can be achieved with a small starting force, so as to achieve the purpose of releasing the stuck drill string, effectively ensuring the safety of drilling construction, and solving the problem in the prior art that after the drill string is stuck, especially in highly deviated wells and horizontal wells, when shock is required, due to the too large frictional resistance of the drill string in the well, the shock absorber cannot start, or the starting force is small, and the shock force acting on the lower drill string is also small, and the stuck drill string cannot be released. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0039] Figure 1 Structural schematic diagram of the mechanical disc spring type double shock intensifier for a shock absorber provided by the embodiment of the present invention;
[0040] Figure 2 For Figure 1 Partial enlarged schematic diagram at position A in
[0041] Figure 3 For Figure 1 Partial enlarged schematic diagram at position B in
[0042] Figure 4 For Figure 1 Partial enlarged schematic diagram at position C in
[0043] Figure 5 For Figure 1 Partial enlarged schematic diagram at position D in
[0044] Figure 6 Schematic diagram of the release mandrel, release slips and external slips engagement structure.
[0045] Icon: 1 - upper sub; 2 - balance piston; 3 - upper mandrel; 4 - transition body; 5 - locking plug; 6 - disc spring; 7 - external slips; 8 - release slips; 9 - release mandrel; 10 - jarring head; 11 - body; 12 - jarring body; 13 - lower sub; 14 - upper oil injection port; 15 - lower oil injection port; 16 - spline groove; 17 - spline body. Detailed implementation manners
[0046] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.
[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.
[0048] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0049] The present invention provides a mechanical disc spring type double shock intensifier for a shock absorber, comprising: an upper sub 1, a transition body 4, a disc spring 6, an outer slip 7, a release slip 8, a release mandrel 9, a shock head 10, a body 11, a shock body 12 and a lower sub 13; the upper sub 1, the transition body 4 and the body 11 are connected in sequence from top to bottom, and the upper sub 1 is used for connecting with the upper drill string; the outer slip 7 is connected with the body 11; the release mandrel 9 is arranged inside the body 11, the release slip 8 is arranged between the release mandrel 9 and the outer slip 7, the engaging teeth arranged on the side of the release slip 8 close to the release mandrel 9 are meshed and connected with the release mandrel 9, and the engaging teeth arranged on the side of the release slip 8 close to the outer slip 7 are opposite to the tooth tips of the engaging teeth arranged on the outer slip 7; the disc spring 6 is arranged above the outer slip 7 and enables the outer slip 7 to have a tendency to move away from the transition body 4; the shock head 10 is connected to the lower part of the release mandrel 9, the lower sub 13 is connected to the lower part of the shock head 10, and the lower part of the lower sub 13 is used for connecting with the shock absorber; the shock body 12 is connected to the lower part of the body 11, and there is a spacing between the top of the shock body 12 and the bottom of the shock head 10 to form a shock stroke; when pipe sticking release is required, the upper drill string is lifted to the starting force of the shock absorber. The lifting force generated by lifting the upper drill string is less than the starting force threshold of the mechanical disc spring type double shock intensifier for the shock absorber, and the lifting force generated by the shock action of the shock absorber is greater than the starting force threshold of the mechanical disc spring type double shock intensifier for the shock absorber.
[0050] The mechanical disc spring type double shock intensifier provided by the present invention is connected above the shock absorber and below the upper drill string. When shock release is not required, the intensifier and the shock absorber can be used for normal construction as conventional drill strings. The release slip 8 is meshed with the release mandrel 9, the upper part of the outer slip 7 is pressed by the disc spring 6, and at the same time, the engaging teeth of the release slip 8 and the outer slip 7 are opposite to each other at the tooth tips to lock the release slip 8 and the release mandrel 9 together. When shock release is required, the drill string is lifted to the starting force of the shock absorber, and the shock absorber starts to achieve the first shock. Since the lifting force generated by lifting the upper drill string is less than the starting force threshold of the intensifier, the intensifier will not start when the drill string is lifted; the lifting force generated by the shock action acts on the body 11. Since the lifting force generated by the shock action of the shock absorber is greater than the starting force threshold of the intensifier, the body 11 drives the outer slip 7 to move upward, compressing the disc spring 6. When moving upward to the set distance, the release slip 8 is meshed with the outer slip 7 and disengaged from the release mandrel 9. At this time, the body 11 drives the shock body 12 to move upward rapidly, and the upper part of the shock body 12 impacts the lower part of the shock head 10 to achieve the second shock. By using this intensifier, a large shock force can be achieved with a small starting force, so as to achieve the purpose of releasing the stuck drill string, effectively ensuring the safety of drilling construction, and solving the problem in the prior art that after the drill string is stuck, especially in highly deviated wells and horizontal wells, when shock is required, due to the too large friction resistance of the drill string in the well, the shock absorber cannot start, or the starting force is small, and the shock force acting on the lower drill string is also small, and the stuck drill string cannot be released.
[0051] The following will combine with Figures 1-6 to detail the structure and shape of the mechanical disc spring type double shock intensifier for the shock absorber provided in this embodiment.
[0052] It should be noted that due to the long pipeline, the pipeline is drawn in two parts in the Figure 1 left and right figures. Therefore, in the actual product, Figure 1 the left and right figures are connected together.
[0053] Regarding the shape and structure of the upper sub 1, transition body 4, balance piston 2 and upper mandrel 3, specifically:
[0054] Referring to Figure 1 and Figure 2 , the upper sub 1 is connected to the upper part of the transition body 4. The upper sub 1 and the transition body 4 are connected by special high-strength threads, which have both sealing performance and can transmit torque and tension.
[0055] The balance piston 2 is located inside the transition body 4 and is sleeved on the upper mandrel 3. An upper annulus is formed between the upper part of the balance piston 2 and the upper mandrel 3, and drilling fluid is provided in the upper annulus; a lower annulus is formed between the lower part of the balance piston 2 and the upper mandrel 3, and hydraulic oil is provided in the lower annulus. Specifically, an upper oil injection port 14 is opened on the transition body 4, and the hydraulic oil enters the lower annulus through the upper oil injection port 14. The hydraulic oil plays a lubricating role to make the internal components move smoothly.
[0056] In an alternative embodiment, sealing rings, mud scraping rings, guide rings and other components are installed on the inner and outer annulus surfaces of the balance piston 2, which can effectively prevent impurities from entering the oil cavity and ensure smooth movement with the mandrel.
[0057] The upper mandrel 3 is installed inside the balance piston 2, and a release mandrel 9 is connected to the lower part of the upper mandrel 3 by threads.
[0058] Regarding the shape and structure of the body 11 and the shock body 12, specifically:
[0059] Referring to Figure 1 and Figure 3 , the upper sub 1, the transition body 4 and the body 11 are connected in sequence from top to bottom. The upper sub 1 is used to connect with the upper drill string. The shock body 12 is connected to the lower part of the body 11.
[0060] Regarding the shape and structure of the disc spring 6, outer slip 7, release slip 8, release mandrel 9, specifically:
[0061] The release mandrel 9 is arranged inside the body 11, and the release slip 8 is arranged between the release mandrel 9 and the outer slip 7. The release mandrel 9 is machined with engaging teeth, and the structure of the engaging teeth meshes with the teeth on the release slip 8. At the same time, the tops of the engaging teeth on the outer slip 7 and the release slip 8 are opposite to each other, ensuring that the release slip 8 is fully meshed with the mandrel and locking the release slip 8 and the release mandrel 9 together.
[0062] The lower part of the outer slip 7 is fixed on the inner step of the body 11. The disc spring 6 is arranged above the outer slip 7 and makes the outer slip 7 tend to move in the direction away from the transition body 4. The upper part of the outer slip 7 is pressed by the disc spring 6, and the disc spring 6 is pressed by the locking plug 5. Specifically, the locking plug 5 is connected to the top of the disc spring 6, the upper end of the locking plug 5 is connected to the lower end of the part of the transition body 4 extending into the body 11, and the predetermined force of the disc spring 6 is determined by the position of the locking plug 5 to ensure that the pre-tightening force of the disc spring 6 reaches the predetermined value.
[0063] Regarding the shape and structure of the shock head 10 and the lower sub 13, specifically:
[0064] Refer to Figure 1 and Figure 5 The lower part of the release mandrel 9 is connected with the shock head 10, the lower part of the shock head 10 is connected with the lower sub 13. The upper part of the lower sub 13 passes through the shock body 12 and extends into the body 11 and is connected with the lower part of the shock head 10. The lower part of the lower sub 13 is used to connect with the shock tool.
[0065] The shock head 10 is arranged inside the body 11, and there is a spacing between the top of the shock body 12 and the bottom of the shock head 10 to form a shock stroke.
[0066] During the shock action, the lower part of the shock head 10 bears the shock from the impact part on the upper part of the shock body 12 and acts the shock force on the lower sub 13 to apply a large shock force to the lower drill string. When the lifting force of the drill string reaches the predetermined force, the shock body 12 and the shock head 10 achieve shock to assist in releasing the stuck drill string.
[0067] The lower part of the shock body 12 is machined with a spline groove 16, which cooperates with the spline body 17 part of the lower sub 13. The spline body 17 can extend into the spline groove 16 to transmit the torque of the upper part of the drill string to the drill bit. Specifically, the spline body 17 is connected to the lower sub 13 through a screw spring assembly. The screw spring assembly consists of a fixing screw and a spring. The fixing screw passes through the spline body 17 and is connected to the lower sub 13. The spring is installed between the head of the fixing screw and the groove formed on the spline body 17 and is in a slightly compressed state.
[0068] Refer to Figure 4, a betting oil inlet 15 is provided on the shock body 12, and hydraulic oil enters the spline groove 16 through the betting oil inlet 15. The hydraulic oil plays a lubricating role inside the tool, enabling the smooth movement of internal components; the preset release force of this intensifier is determined by the shock force at the lower part of the intensifier, and is initially set to 2 - 3 times the starting force of the shocker. It can achieve a larger shock under a smaller starting force of the shocker, and assist in releasing the stuck drill string.
[0069] During shock release to free the stuck, lift the drill string to the starting force of the shocker. The shocker starts and shock occurs; the drill string above the shocker acts on the shock ring of the shocker, and the upward force generated by the shock action acts on the body 11, driving the outer slip 7 to move upward and compressing the disc spring 6; when it moves upward to the set distance, the release slip 8 meshes with the outer slip 7 and disengages from the release mandrel 9. At this time, the body 11 drives the shock body 12 to move upward rapidly, achieving one shock. It should be noted that since the initial force for lifting the drill string is greater than the starting force of the shocker but less than the starting force of the intensifier, the release slip 8 will not mesh with the outer slip 7, and thus the release slip 8 will not disengage from the release mandrel 9. Therefore, the shocker can start and generate the first shock. After that, the upward force generated by the shock action of the shocker is greater than the starting force of the intensifier, which acts on the body 11 and triggers the subsequent second shock.
[0070] Specifically, during on-site construction, this shock intensifier is connected above the shocker, can be used for normal construction as a conventional drill string, and the shock starting force is set on the ground. Assuming the starting force of the shocker is 40t, the starting force of this shock intensifier is set to 80t. When the drill string gets stuck and shock release is needed, the operator lifts the drill string to the starting force of the shocker. At this time, the shocker starts and shock occurs; the force exerted by the drill string above the shocker on the shock ring of the shocker is 120 - 150t. Since the upward force of the upper drill string is much greater than the starting force on the shock intensifier, after the shocker shocks, the upward force on the body 11 of the shock intensifier is 120 - 150t, which is greater than the preset force of 80t. At this time, the body 11 drives the outer slip 7 to move upward and compresses the disc spring 6; when it moves upward to the set distance (the next meshing position), the release slip 8 meshes with the outer slip 7 and disengages from the release mandrel 9. At this time, the body 11 drives the shock body 12 to move upward rapidly, and the upper part of the shock body 12 impacts the lower part of the shock head 10, achieving one shock. After the shock is over, lower the drill string. At this time, the body 11 pushes the locking plug 5, disc spring 6, outer slip 7 and release slip 8 downward. When the release slip 8 and the release mandrel 9 re-mesh, the release slip 8 disengages from the outer slip 7 and returns to the standby state. This intensifier cooperates with the shocker to achieve one stretch and two shocks, and the second shock force is much greater than the first shock force, which can effectively release the stuck drill string.
[0071] The mechanical disc spring type double shock intensifier for a shocker provided in this embodiment realizes the engagement and disengagement between the body 11 and the core shaft through the mechanical disc spring 6 structure. The starting force of this intensifier is determined by the shock force of the shocker at its lower part, and it can achieve a second shock after the shocker shocks, starting this tool with a smaller starting force of the shocker to achieve the purpose of releasing the stuck drill string.
[0072] The mechanical disc spring type double shock intensifier for a shocker provided in this embodiment has the following effects:
[0073] 1. This intensifier is a combination of a release core shaft 9, a release slip 8 and an external slip 7. When the body 11 is lifted to compress the disc spring 6 and travels a certain stroke, the release slip 8 disengages from the release core shaft 9, and the external slip 7 engages with the release slip 8, realizing a first shock between the shock body 12 and the shock head 10 to assist in releasing the stuck drill string.
[0074] 2. This intensifier can be connected above the shocker, and its predetermined release force depends on the shock force of the shocker, generally set to 2 - 3 times the starting force of the shocker, and it can achieve a shock with a greater force under a smaller starting force of the shocker.
[0075] 3. This intensifier is mainly used in wells with large drill string friction such as highly deviated wells and horizontal wells. After giving a smaller starting force to the shocker, a greater starting force can be generated on the tool to achieve a shock with a greater force once.
[0076] This embodiment provides a shock method for a mechanical disc spring type double shock intensifier for a shocker, including the following steps:
[0077] Connect the mechanical disc spring type double shock intensifier for a shocker to the upper part of the shocker and set the shock starting force on the ground;
[0078] When the drill string gets stuck and shock is needed to release the stuck, lift the drill string to the starting force of the shocker. At this time, the shocker starts to achieve the first shock;
[0079] The upward force generated by the shock action of the shocker acts on the body 11, driving the external slip 7 to move upward, compressing the disc spring 6, the release slip 8 engages with the external slip 7, and the release slip 8 disengages from the release core shaft 9. At this time, the body 11 drives the shock body 12 to move upward, and the upper part of the shock body 12 impacts the lower part of the shock head 10 to achieve the second shock.
[0080] Since the technical effects of the shock method of the mechanical disc spring type double shock intensifier for a shocker provided in this embodiment are the same as those of the mechanical disc spring type double shock intensifier for a shocker provided in the above embodiment, they will not be elaborated here.
[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A mechanical disc spring type double shock intensifier for a jar, Characterized in that, Comprising: An upper sub (1), a transition body (4), a disc spring (6), an outer slip (7), a release slip (8), a release mandrel (9), a shock head (10), a body (11), a shock body (12) and a lower sub (13); The upper sub (1), the transition body (4) and the body (11) are connected in sequence from top to bottom, and the upper sub (1) is used for connecting with the upper drill string; The outer slip (7) is connected with the body (11); The release mandrel (9) is arranged inside the body (11), the release slip (8) is arranged between the release mandrel (9) and the outer slip (7), the engaging teeth arranged on one side of the release slip (8) close to the release mandrel (9) are meshed and connected with the release mandrel (9), and the engaging teeth arranged on one side of the release slip (8) close to the outer slip (7) are opposite to the tooth tips of the engaging teeth arranged on the outer slip (7); The disc spring (6) is arranged above the outer slip (7) and makes the outer slip (7) have a tendency to move away from the transition body (4); The shock head (10) is connected to the lower part of the release mandrel (9), the lower sub (13) is connected to the lower part of the shock head (10), and the lower part of the lower sub (13) is used for connecting with the jar; The shock body (12) is connected to the lower part of the body (11), and there is a spacing between the top of the shock body (12) and the bottom of the shock head (10) to form a shock stroke; When it is necessary to release the stuck, lift the upper drill string to the starting force of the jar. The lifting force generated by lifting the upper drill string is less than the starting force threshold of the mechanical disc spring type double shock intensifier for the jar, and the lifting force generated by the shock action of the jar is greater than the starting force threshold of the mechanical disc spring type double shock intensifier for the jar.
2. The mechanical disc spring type double shock intensifier for a jar according to claim 1, Characterized in that, The body (11) extends inwards with a step, and the lower part of the outer slip (7) is connected to the step.
3. The mechanical disc spring type double shock intensifier for a jar according to claim 1, Characterized in that, It further comprises a locking plug (5); The locking plug (5) is connected to the top of the disc spring (6), and the upper end of the locking plug (5) is connected to the transition body (4).
4. The mechanical disc spring type double shock intensifier for a jar according to claim 1, Characterized in that, It further comprises a balance piston (2) and an upper mandrel (3); The balance piston (2) is arranged in the transition body (4) and sleeved on the upper mandrel (3); The lower part of the upper mandrel (3) is connected to the release mandrel (9).
5. The mechanical disc spring type double shock intensifier for a jar according to claim 4, Characterized in that, An upper annulus is formed between the balance piston (2) and the upper mandrel (3) above, and drilling fluid is arranged in the upper annulus.
6. The mechanical disc spring type double shock intensifier for a jar according to claim 4, Characterized in that, Below the balance piston (2) and the upper mandrel (3), a lower annulus is formed, and hydraulic oil is provided in the lower annulus.
7. The mechanical disc spring type double shock intensifier for a shock absorber according to claim 6, characterized in that an upper oil injection port (14) is formed on the transition body (4), and hydraulic oil enters the lower annulus through the upper oil injection port (14).
8. The mechanical disc spring type double shock intensifier for a shock absorber according to claim 1, characterized in that a spline groove (16) is provided at the lower part of the shock body (12), a spline body (17) is provided on the lower sub (13), and the spline body (17) can extend into the spline groove (16).
9. The mechanical disc spring type double shock intensifier for a shock absorber according to claim 8, characterized in that a lower oil injection port (15) is formed on the shock body (12), and hydraulic oil enters the spline groove (16) through the lower oil injection port (15).
10. A shock method using the mechanical disc spring type double shock intensifier for a shock absorber according to any one of claims 1-9, characterized in that it includes the following steps: Connect the mechanical disc spring type double shock intensifier for a shock absorber to the upper part of the shock absorber, and set the shock starting force on the ground; When the drill string gets stuck and shock unlocking is required, lift the drill string to the shock starting force of the shock absorber. At this time, the shock absorber starts to achieve the first shock; The upward force generated by the shock action of the shock absorber acts on the body (11), drives the outer slip (7) to move upward, compresses the disc spring (6), releases the engagement between the slip (8) and the outer slip (7), and the slip (8) disengages from the release mandrel (9). At this time, the body (11) drives the shock body (12) to move upward, and the upper part of the shock body (12) impacts the lower part of the shock head (10) to achieve the second shock.