Valve body for high-temperature-resistant hydraulic jar of ultra-deep well

Abstract

The utility model discloses a valve body for a high-temperature-resistant hydraulic jar for an ultra-deep well, which is cylindrical, is sleeved on an upper mandrel of the hydraulic jar and is positioned between the upper mandrel of the hydraulic jar and a pressure body of the hydraulic jar. Blind holes evenly distributed in the circumferential direction are formed in the end face of the valve body, springs and supporting columns are installed in the blind holes, the springs abut against the bottoms of the supporting columns and the bottoms of the blind holes respectively, a baffle ring is arranged in a pressure body of the hydraulic jar, and the baffle ring and the end, provided with the blind holes, of the valve body are oppositely arranged. Through the combination of the spring and the supporting column, the contact between the valve body and the baffle ring is changed from rigidity to flexibility, harmful vibration generated when the valve body works is eliminated, abrasion of the valve body is reduced, and the service life of the hydraulic vibrator is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic jars, in particular to a valve body for high-temperature resistant hydraulic jars for ultra-deep wells. Background Art

[0002] During oil well or geological drilling, drill bits often get stuck in the well, a common problem known as drill sticking. To remove the drill bit, the quickest solution is to apply upward and downward impact force to it. Once the drill bit is loosened, it can be salvaged. The primary tool for providing the impact force is the jar. Currently, domestic jars use a cone-shaped and valve-shaped structure for their valve body components. The cone-shaped structure has high machining requirements and requires grinding, resulting in a complex process. The valve body structure generally uses a copper alloy with a lower hardness. However, the copper alloy valve body and the upper spindle move relative to each other. Since the upper spindle is alloy steel with a higher hardness, this can cause excessive wear on the valve body, leading to failure of the seal between the valve body and the upper spindle, resulting in the valve body being scrapped. Furthermore, the copper alloy used for the valve body has high material costs. In addition, since the valve body and the cylinder body are sealed with an interference surface when they are under pressure, the high pressure generated by repeated pressure holding for a long time during operation causes the oil temperature to rise. In addition, the temperature of ultra-deep wells is very high, resulting in uneven force on the valve body and shaking, large friction resistance, deformation of the hydraulic cavity cylinder and severe wear of the valve body. Therefore, the pressure holding delay effect is unstable, which does not meet the use requirements of the jar and has a short life of parts. Summary of the Invention

[0003] In order to solve the above problems, the utility model provides a valve body for a high-temperature resistant hydraulic jar for ultra-deep wells, the purpose of which is to improve the delay stability of the hydraulic jar, reduce harmful vibrations, and increase the service life of the hydraulic jar.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a valve body for an ultra-deep well high-temperature resistant hydraulic jar, the valve body is cylindrical, the valve body is sleeved on the upper core shaft of the hydraulic jar and is located between the upper core shaft of the hydraulic jar and the pressure body of the hydraulic jar, the end face of the valve body is provided with blind holes evenly distributed along the circumferential direction, a spring and a support column are installed in the blind hole, the spring respectively abuts the support column and the bottom of the blind hole, a retaining ring is provided in the pressure body of the hydraulic jar, and the retaining ring is arranged relative to the blind hole end of the valve body.

[0005] The valve body is interference fit with the upper core shaft of the hydraulic jar, and the valve body is provided with a stepped discharge channel, the stepped discharge channel extending along the axial direction of the valve body and radially connected to the inner hole of the valve body at the end; a wire plug, a filter screen and a flow valve are sequentially installed in the stepped discharge channel along the direction of the liquid outlet, and the flow valve housing is interference fit with the stepped discharge channel.

[0006] The width of the stepped discharge channel gradually decreases along the liquid outlet direction.

[0007] The screw plug is provided with a central hole, and the screw plug is threadedly connected to the stepped discharge channel.

[0008] The outer wall of the valve body is provided with splines evenly distributed along the circumferential direction.

[0009] High-hardness alloy copper is welded on the inner hole of the valve body.

[0010] Beneficial effects of the utility model:

[0011] 1) By setting the flow valve, the oil flow rate can be accurately controlled to ensure the accuracy of the discharge time and the constancy of the jar delay time, thereby improving the movement stability of the hydraulic vibrator.

[0012] 2) By setting a combination of springs and support columns, the contact between the valve body and the retaining ring is changed from rigid to flexible, eliminating harmful vibrations generated when the valve body is working, reducing valve body wear and extending the service life of the hydraulic vibrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings:

[0014] Figure 1 This is the assembly drawing of the utility model;

[0015] Figure 2 It is a front view of the utility model;

[0016] Figure 3 It is a half-section left view of the utility model;

[0017] Figure 4 It is the AA cross-sectional view of the present utility model;

[0018] Figure 5 This is a schematic diagram of the wire plug of the utility model;

[0019] In the figure: 1. Valve body; 2. Upper core shaft; 3. Pressure body; 4. Step-type discharge channel; 5. Plug; 6. Filter; 7. Flow valve; 8. Blind hole; 9. Spring; 10. Support column; 11. Retaining ring; 12. Center hole; 13. Spline. DETAILED DESCRIPTION

[0020] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0021] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0022] like Figures 1 to 5 As shown, the utility model provides a valve body for an ultra-deep well high-temperature resistant hydraulic jar. The valve body 1 is cylindrical and is sleeved on the upper core shaft 2 of the hydraulic jar and is located between the upper core shaft 2 of the hydraulic jar and the pressure body 3 of the hydraulic jar. The end face of the valve body 1 is provided with blind holes 8 uniformly distributed along the circumferential direction. A spring 9 and a support column 10 are installed in the blind hole 8. The spring 9 abuts the support column 10 and the bottom of the blind hole 8 respectively. A retaining ring 11 is provided in the pressure body 3 of the hydraulic jar. The retaining ring 11 is arranged opposite to the end of the valve body 1 where the blind hole 8 is opened. By providing the combination of the spring 9 and the support column 10, the contact between the valve body 1 and the retaining ring 11 is changed from rigid to flexible, eliminating harmful vibrations generated by the valve body 1 during operation, reducing the wear of the valve body 1, and extending the service life of the hydraulic jar.

[0023] Specifically, the valve body 1 is interference-fitted with the upper spindle 2 of the hydraulic jar. The valve body defines a stepped discharge channel 4, which extends axially along the valve body 1 and radially connects to the inner bore of the valve body 1 at its distal end. This serves to relieve the hydraulic fluid from the pressure after the valve body 8 is operating under pressure, allowing it to flow through the left and right oil chambers. A plug 5, a filter screen 6, and a flow valve 7 are sequentially installed within the stepped discharge channel 4 along the direction of the liquid outlet. The outer shell of the flow valve 7 is interference-fitted with the stepped discharge channel 4. Because the upper spindle 2 and the valve body 1 form a seal due to the interference fit, hydraulic oil can only flow through the stepped discharge channel 4. The width of the stepped discharge channel 4 gradually decreases along the direction of the liquid outlet. Because the stepped discharge channel 4 is very narrow, the hydraulic jar begins to store energy. When the upper spindle 2 ascends a certain distance, the seal between the upper spindle 2 and the inner bore of the valve body 1 is released, and the valve body 1 rapidly discharges fluid, instantly releasing the stored energy and generating a huge shock force. By setting the flow valve 7, the oil flow rate can be accurately controlled to ensure the accuracy of the discharge time and the constancy of the jar delay time, thereby improving the movement stability of the hydraulic vibrator.

[0024] Specifically, the wire plug 5 is provided with a center hole 12, and the wire plug 5 is threadedly connected to the stepped leakage channel 4. The wire plug 5 is used to fix the flow valve 7 and the filter 6 in the stepped leakage channel 4. The hydraulic oil flows from the center hole 12 to the filter 6, and the filter 6 filters the impurities in the hydraulic oil to ensure that the flow valve 7 is not blocked.

[0025] Specifically, the outer wall of the valve body 1 is provided with splines 13 evenly distributed along the circumferential direction. The valve body 1 and the pressure body 3 are matched through the splines 13, which can withstand a large load and ensure that the valve body 1 and the pressure body 3 are stably connected when the hydraulic vibrator generates an impact. This solves the problems in the prior art of large friction resistance of the interference surface seal between the valve body and the outer cylinder body, increased oil temperature under long-term repeated pressure holding operation, uneven force on the valve body causing shaking, cylinder body deformation and serious valve body wear resulting in unstable pressure holding delay effect and short parts life.

[0026] Specifically, high-hardness copper alloy is welded on the inner hole of the valve body 1. In addition to its high hardness, the copper alloy also has the advantages of high sealing and good wear resistance, which can effectively reduce the wear of the valve body 1 and extend the service life of the valve body 1.

[0027] In addition to the above-mentioned preferred embodiments, the present invention has other implementation methods. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A valve body for a high-temperature resistant hydraulic jar for ultra-deep wells, wherein the valve body (1) is cylindrical, is sleeved on an upper mandrel (2) of the hydraulic jar and is located between the upper mandrel (2) of the hydraulic jar and a pressure body (3) of the hydraulic jar, and is characterized in that: The end face of the valve body (1) is provided with blind holes (8) uniformly distributed along the circumferential direction, and a spring (9) and a support column (10) are installed in the blind hole (8), and the spring (9) abuts against the support column (10) and the bottom of the blind hole (8) respectively. A retaining ring (11) is provided in the pressure body (3) of the hydraulic jar, and the retaining ring (11) is arranged opposite to the end of the valve body (1) where the blind hole (8) is opened.

2. The valve body for ultra-deep well high-temperature resistant hydraulic jar according to claim 1, characterized in that: The valve body (1) is interference-fitted with the upper core shaft (2) of the hydraulic jar, and the valve body is provided with a stepped discharge channel (4), which penetrates the valve body (1) along the axial direction of the valve body (1); a wire plug (5), a filter screen (6) and a flow valve (7) are sequentially installed in the stepped discharge channel (4) along the direction of the liquid outlet, and the outer shell of the flow valve (7) is interference-fitted with the stepped discharge channel (4).

3. The valve body for a high-temperature resistant hydraulic jar for ultra-deep wells according to claim 2, characterized in that: The width of the stepped discharge channel (4) gradually decreases along the liquid outlet direction.

4. The valve body for a high-temperature resistant hydraulic jar for ultra-deep wells according to claim 2, characterized in that: The thread plug (5) is provided with a central hole (12), and the thread plug (5) is threadedly connected to the stepped drainage channel (4).

5. The valve body for a high temperature resistant hydraulic jar for ultra-deep wells according to claim 1, characterized in that: The outer wall of the valve body (1) is provided with splines (13) evenly distributed along the circumferential direction.

6. The valve body for a high temperature resistant hydraulic jar for ultra-deep wells according to claim 1, characterized in that: High-hardness copper alloy is welded on the inner hole of the valve body (1).

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