Bidirectional hydraulic jar with single cylinder body controlling different vertical jarring forces

Abstract

The bidirectional hydraulic jar comprises a pressure-bearing barrel, a mandrel assembly is movably installed in the pressure-bearing barrel, an inner protruding cylindrical surface is arranged in the middle of an inner hole of the pressure-bearing barrel, the two ends of a middle mandrel are fixedly connected with an upper mandrel and a lower mandrel respectively, and the upper mandrel and the lower mandrel are fixedly connected with the two ends of the middle mandrel respectively. A throttling valve assembly is connected to the outer circle of the middle of the middle mandrel in a sleeved mode, an upper matching sealing face and a lower matching sealing face are arranged at the upper end and the lower end of the throttling valve assembly, and the outer diameter of the throttling valve assembly in the mandrel assembly is larger than that of other parts. Interference sealing is formed between the throttling valve assembly and the throttling valve assembly, and a drainage gap generated when the throttling valve assembly is hit upwards is smaller than a drainage gap generated when the throttling valve assembly is hit downwards. By means of the structure, the requirement that the two-way jarring force of the two-way hydraulic jar is controlled to be different in magnitude and different in time delay under the single cylinder body is met, upward and downward jarring movement can be controlled in one cylinder body, and the requirement that the upward and downward jarring force is different can be met.

Description

Technical Field

[0001] The invention relates to a bidirectional hydraulic jar, in particular to a bidirectional hydraulic jar with a single cylinder body controlling different up and down jarring forces. Background Art

[0002] The use requirements of bidirectional hydraulic jars and the petroleum industry standard "SY / T 5496-2017" stipulate that the shock force and delay during upward and downward impact are different. The upward impact force is much greater than the downward impact force, and the upward impact force is more than twice the downward impact force. Bidirectional hydraulic jars require different shock delays during upward and downward impacts, so bidirectional jars basically use two valve body assemblies to achieve bidirectional shock force in their respective cavities composed of two cylinders.

[0003] The prior art bidirectional hydraulic jars all have bidirectional throttling function, and the basic structure of upper and lower jars is that the upper and lower cylinders are composed of respective cavities for controlling the bidirectional jarring force of the upper and lower jars. There are two basic mechanisms for controlling the bidirectional jarring force of the upper and lower jars.

[0004] One is the dual-chamber controlled axial hole gap leakage control shock force, shock piston and valve core (valve body and valve needle), or piston and valve needle / filter flow control assembly, and the valve body assembly is a high-cost part and the two hydraulic chamber parts are more, the jar tool is longer after assembly, which increases the manufacturing cost and makes maintenance and disassembly cumbersome. For example, CN217481224U is a valve core mouth inner hole chamfer and core shaft seal, and the valve core outer circle interference fit seal; Application No. 202021456249.0 Delay mechanism for hydraulic jar and self-flushing hydraulic jar, Application No. 202123105879.0 A throttle valve for a jar is an axial hole leakage with an outer cylindrical seal and an end seal.

[0005] The other is a double-chamber controlled valve body that uses end face gap leakage to control the shock force.

[0006] There is a so-called single-chamber controlled bidirectional hydraulic jar in the existing patent technology, such as application number 202411125050.2, which is a single-chamber double-stroke jar. In fact, it consists of two sets of upper and lower oil filling holes and oil outlet holes, which respectively fill the upper and lower high-pressure areas with oil to ensure the single-chamber oil filling effect, but it is not a true single-chamber. Summary of the invention

[0007] The purpose of the present invention is to provide a bidirectional hydraulic jar with a single cylinder body controlling different up and down jarring forces. The bidirectional jarring force of the bidirectional hydraulic jar can be controlled in one cylinder body to control the up and down jarring movements while meeting the requirements of different up and down jarring forces.

[0008] The technical solution of the present invention is as follows: a bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, comprising a pressure-bearing cylinder, a core shaft assembly movably installed inside the pressure-bearing cylinder, an inner convex cylindrical surface arranged in the middle of the inner hole of the pressure-bearing cylinder, the core shaft assembly comprising an upper core shaft, an intermediate core shaft, a lower core shaft and a throttle valve assembly, an upper core shaft and a lower core shaft being fixedly connected at both ends of the intermediate core shaft, a throttle valve assembly being sleeved on the outer circle in the middle of the intermediate core shaft, an upper mating sealing surface and a lower mating sealing surface being arranged at the upper and lower ends of the throttle valve assembly, an outer diameter of the throttle valve assembly in the core shaft assembly being larger than the outer diameters of other parts, when the outer cylindrical surface of the throttle valve assembly contacts the inner convex cylindrical surface of the pressure-bearing cylinder, an interference seal is formed between the two, and a leakage gap of the throttle valve assembly during upward striking is smaller than a leakage gap during downward striking.

[0009] In the aforementioned bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, the intermediate spindle is threadedly sleeved on the upper spindle, the lower spindle is threadedly sleeved on the outer wall of the intermediate spindle, the outer periphery of the intermediate spindle is a step-type structure, and the upper mating sealing surface and the lower mating sealing surface are the step surface of the intermediate spindle and the upper end surface of the lower spindle respectively; Alternatively, the upper spindle and the lower spindle are both threadedly sleeved on the middle spindle, and the upper matching sealing surface and the lower matching sealing surface are respectively the lower end surface of the upper spindle and the upper end surface of the lower spindle.

[0010] In the aforementioned bidirectional hydraulic jar with a single cylinder controlling different upper and lower jarring forces, there is a gap between the inner hole of the throttle valve assembly and the outer periphery of the intermediate core shaft, and the length from the upper mating sealing surface to the lower mating sealing surface is greater than the length of the throttle valve assembly.

[0011] In the aforementioned bidirectional hydraulic jar with a single cylinder controlling different upper and lower jarring forces, the outer periphery, upper and lower end faces, upper mating sealing surface, lower mating sealing surface, and the inner raised cylindrical surface of the pressure-bearing cylinder of the throttle valve assembly are all subjected to wear-resistant and acid- and alkali-resistant surface strengthening treatment.

[0012] A bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces comprises a pressure-bearing cylinder body, a core shaft assembly is movably installed inside the pressure-bearing cylinder body, an inner convex cylindrical surface is arranged in the middle of the inner hole of the pressure-bearing cylinder body, the core shaft assembly comprises an upper core shaft, an intermediate core shaft, a lower core shaft and a throttle valve assembly, an upper core shaft and a lower core shaft are fixedly connected at both ends of the intermediate core shaft, the outer periphery of the intermediate core shaft is a step-type structure, a throttle valve assembly is sleeved on the intermediate core shaft between the step surface and the upper end surface of the lower core shaft, the outer diameter of the throttle valve assembly in the core shaft assembly is larger than the outer diameters of other parts, when the outer cylindrical surface of the throttle valve assembly contacts the inner convex cylindrical surface of the pressure-bearing cylinder body, an interference seal is formed between the two, and the leakage gap of the throttle valve assembly during upward impact is smaller than the leakage gap during downward impact.

[0013] In the aforementioned bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, the upper spindle is threadedly sleeved in the inner hole of the middle spindle, the lower spindle is threadedly sleeved on the outer wall of the middle spindle, and rubber sealing groups are provided at both ends of the threaded connection between the middle spindle and the upper spindle and the lower spindle.

[0014] In the aforementioned bidirectional hydraulic jar with a single cylinder controlling different upper and lower jarring forces, there is a gap between the inner hole of the throttle valve assembly and the outer periphery of the middle spindle, and the distance from the upper end face of the lower spindle to the step face of the middle spindle is greater than the length of the throttle valve assembly.

[0015] In the aforementioned bidirectional hydraulic jar with a single cylinder controlling different upper and lower jarring forces, the outer periphery, upper and lower end faces of the throttle valve assembly, the upper end face of the lower spindle, the step surface of the middle spindle, and the inner raised cylindrical surface of the pressure-bearing cylinder are subjected to wear-resistant and acid- and alkali-resistant surface strengthening treatment.

[0016] In the aforementioned bidirectional hydraulic jar with a single cylinder body controlling different up and down jarring forces, the junctions between the two sides of the inner raised cylindrical surface and the inner hole wall of the pressure-bearing cylinder are smoothly transitioned through a small taper surface, and the edges of the junctions are polished.

[0017] In the aforementioned bidirectional hydraulic jar with a single cylinder controlling different upper and lower jarring forces, the throttle valve assembly includes two throttle valves arranged back to back, and the two throttle valves have similar structures, including a cylindrical valve body, a leakage channel hole is provided on the valve body, and the bottom of the leakage channel hole is connected to the outside through the leakage hole; a modular tube is provided in the leakage channel hole, and a valve needle is provided in the modular tube, and a filter element and a hollow screw plug are installed in the leakage channel hole at the outer end of the modular tube in sequence, wherein the valve needle of the throttle valve arranged near the upper end face of the lower spindle is an upper striking valve needle, and the valve needle of the throttle valve arranged near the step surface of the middle spindle is a lower striking valve needle, and the size of the upper striking valve needle is larger than that of the lower striking valve needle.

[0018] In the aforementioned bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, the upper striking valve needle and the lower striking valve needle are clearance-fitted with the modular tube; a sealing cylindrical boss is provided on the outer periphery of the valve body, and the sealing cylindrical boss is at the maximum outer diameter of the valve body.

[0019] In the aforementioned bidirectional hydraulic jar with a single cylinder controlling different upper and lower jarring forces, the throttle valve assembly includes a cylindrical valve body, and the valve body is provided with a leakage channel hole penetrating through its two end surfaces along its axial direction, and the leakage channel hole includes a valve needle hole in the middle, and a valve needle is provided in the valve needle hole, and the valve needle hole consists of an upper valve needle hole and a lower valve needle hole, and the aperture of the upper valve needle hole is smaller than the aperture of the lower valve needle hole.

[0020] In the aforementioned bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, the leakage channel hole also includes a filter element mounting hole and a screw plug mounting hole respectively arranged at the outer ends of the upper striking valve needle hole and the lower striking valve needle hole, and the filter element mounting hole and the screw plug mounting hole are respectively provided with a filter element and a hollow screw plug, and the two screw plug mounting holes are radially provided with a leakage channel connected to the outside, and the leakage channel is divided into an upper striking leakage hole and a lower striking leakage hole.

[0021] In the aforementioned bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, a sealing cylindrical boss is provided at each end surface of the valve body periphery, and the outer diameter of the sealing cylindrical boss is larger than the outer diameter of the valve body on both sides thereof. The outer wall of the valve body between the two sealing cylindrical bosses forms a middle flow surface. A plurality of pressure balancing holes are provided on the valve body periphery at the middle flow surface, and the pressure balancing holes are connected to the inner hole of the valve body; a small cone angle surface is used for transition between the sealing cylindrical boss and the valve bodies on both sides thereof.

[0022] Beneficial effects of the present invention: Compared with the prior art, the present invention provides a throttle valve assembly between the middle spindle and the lower spindle, and optimizes the structure of the throttle valve assembly so that the leakage gap of the throttle valve assembly during upward impact is smaller than the leakage gap during downward impact, thereby satisfying the requirements of different bidirectional impact forces and different delays of the bidirectional hydraulic jar under a single cylinder body, and can realize the control of the upward and downward impact movements in one cylinder body while satisfying the requirements of different upward and downward impact forces. Moreover, the bidirectional hydraulic jar of the present invention has a simple structure, convenient maintenance, and reduced manufacturing cost, and has good promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is another structural schematic diagram of the mandrel assembly according to the first embodiment of the present invention; Figure 3 This is a schematic structural diagram of a throttle valve assembly according to Embodiment 1 of the present invention; Figure 4 for Figure 3 A schematic diagram of the side structure of Figure 5 for Figure 3 A schematic diagram of the structure of a valve body in a throttle valve assembly; Figure 6 This is a schematic diagram of the upper striking principle of the first embodiment of the present invention; Figure 7 This is a schematic diagram of the striking principle of the first embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Fig. 9 It is a structural schematic diagram of a throttle valve according to a second embodiment of the present invention; Fig.10 This is a schematic diagram of the upper striking principle of the second embodiment of the present invention; Fig.11 This is a schematic diagram of the striking principle of the second embodiment of the present invention.

[0024] Figure markings: 1-upper spindle, 2-middle spindle, 3-pressure-bearing cylinder, 4-lower spindle, 5-throttle valve assembly, 6-inner raised cylindrical surface, 7-valve body, 8-module tube, 9-valve needle, 10-filter element, 11-hollow screw plug, 12-upper strike valve needle, 13-lower strike valve needle, 14-leakage channel hole, 15-upper strike valve needle hole, 16-lower strike valve needle hole, 17-sealing cylindrical boss, 18-middle flow surface, 19-pressure balance hole, 20-semicircular groove liquid flow channel, 21-leakage hole, 22-upper strike leakage hole, 23-lower strike leakage hole. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0026] Embodiment 1 of the present invention: A bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, comprising a pressure-bearing cylinder 3, a core shaft assembly movably installed inside the pressure-bearing cylinder 3, an inner convex cylindrical surface 6 being arranged in the middle of the inner hole of the pressure-bearing cylinder 3, the core shaft assembly comprising an upper core shaft 1, an intermediate core shaft 2, a lower core shaft 4 and a throttle valve assembly 5, the upper core shaft 1 and the lower core shaft 4 being fixedly connected at both ends of the intermediate core shaft 2, a throttle valve assembly 5 being sleeved on the outer circle in the middle of the intermediate core shaft 2, an upper mating sealing surface and a lower mating sealing surface being arranged at the upper and lower ends of the valve core assembly 5, the outer diameter of the throttle valve assembly 5 in the core shaft assembly being larger than the outer diameters of other parts, when the outer cylindrical surface of the throttle valve assembly 5 contacts the inner convex cylindrical surface 6 of the pressure-bearing cylinder 3, an interference seal is formed between the two, and the leakage gap of the throttle valve assembly 5 during upward impact is smaller than the leakage gap during downward impact.

[0027] The throttle valve assembly 5 includes a cylindrical valve body 7, and the valve body 7 is provided with a leakage channel hole 14 passing through the two end surfaces thereof along its axial direction. The leakage channel hole 14 includes a valve needle hole in the middle, and a valve needle 12 is arranged in the valve needle hole. The valve needle hole consists of an upper valve needle hole 15 and a lower valve needle hole 16. The aperture of the upper valve needle hole 15 is smaller than the aperture of the lower valve needle hole 16.

[0028] The leakage channel hole 14 also includes a filter element mounting hole and a screw plug mounting hole respectively arranged at the outer ends of the upper strike valve needle hole 15 and the lower strike valve needle hole 16, and the filter element mounting hole and the screw plug mounting hole are respectively provided with a filter element 10 and a hollow screw plug 11, and the two screw plug mounting holes are radially provided with a leakage channel connected to the outside, and the leakage channel is divided into an upper strike leakage hole 22 and a lower strike leakage hole 23.

[0029] A sealing cylindrical boss 17 is provided at the outer circumference of the valve body 7 near the two end surfaces. The outer diameter of the sealing cylindrical boss 17 is larger than the outer diameter of the valve body 7 on both sides thereof. The two sealing cylindrical bosses 11 respectively form a sealing surface A and a sealing surface B. The purpose of setting the two sealing cylindrical bosses 17 is to reduce the sealing contact area between the valve body 7 and the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 when the valve body 7 is pressed up and down.

[0030] The outer wall of the valve body 7 between the two sealing cylindrical bosses 17 forms a middle flow surface 18. A plurality of pressure balance holes 19 are arranged on the outer periphery of the valve body 7 at the middle flow surface 18. The pressure balance holes 19 are connected to the inner hole of the valve body 7. A plurality of semicircular groove liquid flow channels 20 are arranged on the inner hole wall of the valve body 7. The semicircular groove liquid flow channels 20 are used for the left and right circulation of the hydraulic chamber liquid. The function of the pressure balance hole 19 is as follows: when the double-acting jar is in the up and down jarring and holding pressure movement, the sealing surface A / B of the sealing cylindrical boss 11 is held pressure, and the pressure balance hole 19 balances the pressure of the high-pressure chamber and the holding pressure valve body 7. The middle flow surface 18 is pressure balanced to avoid the valve body 7 from shaking due to holding pressure, so that the valve body 7 moves smoothly.

[0031] Small cone angle surfaces are arranged on the left and right sides of the sealing cylindrical boss 17 to facilitate navigation transition when the valve body 7 moves up and down, and the edges where the small cone angle intersects with the sealing cylindrical boss 17 are chamfered and polished.

[0032] Embodiment 2 of the present invention: A bidirectional hydraulic jar with a single cylinder body controlling different upper and lower jarring forces, characterized in that: it includes a pressure-bearing cylinder 3, a core shaft assembly is movably installed inside the pressure-bearing cylinder 3, an inner convex cylindrical surface 6 is arranged in the middle of the inner hole of the pressure-bearing cylinder 3, the core shaft assembly includes an upper core shaft 1, an intermediate core shaft 2, a lower core shaft 4 and a throttle valve assembly 5, the upper core shaft 1 and the lower core shaft 4 are fixedly connected at both ends of the intermediate core shaft 2, a throttle valve assembly 5 is sleeved on the outer circle of the middle part of the intermediate core shaft 2, upper and lower mating sealing surfaces are arranged at the upper and lower ends of the valve core assembly 5, the outer diameter of the throttle valve assembly 5 in the core shaft assembly is larger than the outer diameters of other parts, when the outer cylindrical surface of the throttle valve assembly 5 contacts the inner convex cylindrical surface 6 of the pressure-bearing cylinder 3, an interference seal is formed between the two, and the leakage gap of the throttle valve assembly 5 when striking upward is smaller than the leakage gap when striking downward.

[0033] The throttle valve assembly 5 includes two throttle valves arranged back to back. The two throttle valves have similar structures and include a cylindrical valve body 7. A leakage channel hole 14 is provided on the valve body 7. The bottom of the leakage channel hole 14 is connected to the outside through a radially arranged leakage hole 21; a modular tube 8 is provided in the leakage channel hole 14, and a valve needle 9 is provided in the modular tube 8. A filter element 10 and a hollow screw plug 11 are installed in the leakage channel hole 14 at the outer end of the modular tube 8 in sequence, wherein the valve needle 9 of the throttle valve arranged near the upper end face of the lower spindle 4 is an upward striking valve needle 12, and the valve needle 9 of the throttle valve arranged near the step surface of the middle spindle 2 is a downward striking valve needle 13, and the size of the upward striking valve needle 12 is larger than that of the downward striking valve needle 13.

[0034] The upper striking valve needle 12 and the lower striking valve needle 13 are clearance-matched with the modular tube 8 to ensure that the fluid can be discharged through the discharge channel hole 14 .

[0035] A sealing cylindrical boss 17 is provided on the outer periphery of the valve body 7. The sealing cylindrical boss 17 is at the maximum outer diameter of the valve body 7. The valve body 7 on both sides of the sealing cylindrical boss 17 is provided with an inclined surface and a step surface smaller than the size thereof. The purpose of providing the sealing cylindrical boss 17 is to reduce the sealing contact area between the valve body 7 and the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 when the valve body 7 is pressed up and down.

[0036] A plurality of axially penetrating semicircular groove liquid flow channels 20 are arranged on the inner hole wall of the valve body 7, and the semicircular groove liquid flow channels 20 are used for the left-right circulation of the liquid in the hydraulic chamber.

[0037] In the above two embodiments, the spindle assembly can adopt the following two structural forms. One structure is: the upper spindle 1 is threadedly sleeved in the inner hole of the middle spindle 2, the lower spindle 4 is threadedly sleeved on the outer wall of the middle spindle 2, the outer periphery of the middle spindle 2 is a step-type structure, and a throttle valve assembly installation chamber is formed between the upper end surface of the lower spindle 4 and the step surface of the middle spindle 2, and a throttle valve assembly 5 is movably sleeved on the middle spindle 2 at the throttle valve assembly installation chamber. In this structure, the upper mating sealing surface and the lower mating sealing surface are the step surface of the middle spindle 2 and the upper end surface of the lower spindle 4, respectively. Another structure is: the upper spindle 1 and the lower spindle 4 are both threadedly sleeved on the outer wall of the middle spindle 2, and a throttle valve assembly installation chamber is formed between the upper end surface of the lower spindle 4 and the lower end surface of the upper spindle 1, and a throttle valve assembly 5 is movably sleeved on the middle spindle 2 at the throttle valve assembly installation chamber. In this structure, the upper mating sealing surface and the lower mating sealing surface are the lower end surface of the upper spindle 1 and the upper end surface of the lower spindle 4 respectively.

[0038] In the two structures of the spindle assembly, the middle spindle 2 can be a stepped structure or a shaft with threads at both ends. As long as the throttle valve assembly 5 is set in the middle of the middle spindle 2, there is a movable gap and a sealed end face between the lower spindle 4 and the upper spindle 1.

[0039] Rubber sealing groups are provided at both ends of the threaded connection between the middle spindle 2 and the upper spindle 1 and the lower spindle 4 to improve the sealing performance.

[0040] There is a gap between the inner hole of the throttle valve assembly 5 and the outer periphery of the intermediate spindle 2, and the length from the upper mating sealing surface to the lower mating sealing surface is greater than the length of the throttle valve assembly 5. When the upper spindle 1 is threadedly sleeved in the inner hole of the intermediate spindle 2, the lower spindle 4 is threadedly sleeved on the outer wall of the intermediate spindle 2, and the outer periphery of the intermediate spindle 2 is a step-type structure, the distance from the upper end surface of the lower spindle 4 to the step surface of the intermediate spindle 2 is greater than the length of the throttle valve assembly 5. When both the upper spindle 1 and the lower spindle 4 are threadedly sleeved on the outer wall of the intermediate spindle 2, the distance from the upper end surface of the lower spindle 4 to the lower end surface of the upper spindle 1 is greater than the length of the throttle valve assembly 5.

[0041] The outer periphery, upper and lower end surfaces of the throttle valve assembly 5, the upper and lower matching sealing surfaces of the throttle valve assembly 5, and the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 are all subjected to wear-resistant and acid-alkali-resistant surface strengthening treatment.

[0042] The junctions between the two sides of the inner raised cylindrical surface 6 and the inner hole wall of the pressure-bearing cylinder 3 are smoothly transitioned through a small taper surface, and the edges of the junctions are polished.

[0043] The bidirectional hydraulic jar of the present invention is structurally composed of an upper spindle 1, an intermediate spindle 2, a pressure-bearing cylinder 3, a lower spindle 4, and a throttle valve assembly 5.

[0044] The pressure-bearing cylinder 3 is the outer cylinder of the cylinder body, and an inner convex cylindrical surface 6 is arranged in the middle. The inner convex cylindrical surface 6 is used to seal and hold pressure with the outer periphery of the throttle valve assembly 6. The surface roughness value of the inner convex cylindrical surface 6 is relatively small, and surface strengthening treatment is required to be wear-resistant and acid-alkali-resistant. The joints between the two sides of the inner hole of the pressure-bearing cylinder 3 and the boss cylindrical surface 6 require a smooth transition with a small taper surface, and the edges are polished to facilitate the interference sealing movement of the throttle valve assembly 5 in the pressure-bearing cylinder 3, avoid damage to the throttle valve assembly 5 and the pressure-bearing cylinder 3 due to relative movement, and ensure reliable sealing.

[0045] The spindle assembly is composed of an upper spindle 1, a middle spindle 2, a lower spindle 4 and a throttle valve assembly 5.

[0046] The throttle valve assembly 5 is specifically composed of a valve body 7, a valve needle 9, a filter element 10 and a hollow screw plug 11, and the mounting inner holes of the valve needle 9, the filter element 10 and the hollow screw plug 11 are interconnected.

[0047] The throttle valve assembly 5 is movably arranged between the middle spindle 2 and the lower spindle 4. There is sufficient clearance between the inner hole of the throttle valve assembly 5 and the middle spindle 2. There is also a certain spacing (at least 2 mm) between the throttle valve assembly 5 and the lower spindle 4. The axial clearance and the inner hole clearance ensure that the throttle valve assembly 5 can move freely left and right between the middle spindle 2 and the lower spindle 4 without getting stuck.

[0048] The upper spindle 1 is threadedly connected to the middle spindle 2, and rubber sealing groups are arranged at both ends of the threaded connection. Specifically, the middle spindle 2 is internally threaded, and the upper spindle 1 is externally threaded. When the lower spindle is sealed, the step surface that seals with the upper end surface of the throttle valve assembly 5 is arranged on the middle spindle 2, and the upper end of the middle spindle 2 is an internal thread with a large-headed step cylinder. In addition, the upper end of the middle spindle 2 can also be an external thread, and the upper spindle 1 that matches it is arranged as an internal thread with a large-headed external cylinder. At this time, it is also possible that the surface that seals with the upper end surface of the throttle valve assembly 5 is arranged on the lower end surface of the upper spindle 1.

[0049] The lower spindle 4 is threadedly connected to the middle spindle 2, and rubber sealing groups are provided at both ends of the threaded connection. The threaded connection is specifically that the middle spindle 2 is an external thread, and the lower spindle 4 is an internal thread. The step surface that seals with the lower end face of the throttle valve assembly 5 during the upward impact sealing is the upper end face of the lower spindle 4.

[0050] The sealing cylindrical boss 17 of the throttle valve assembly 5 is metal-sealed with the inner raised cylindrical surface 6 on the inner hole wall of the pressure-bearing cylinder 3. The surface where the sealing cylindrical boss 17 of the throttle valve assembly 5 contacts the inner hole of the pressure-bearing cylinder 3 also needs to be treated with surface strengthening to be wear-resistant and acid-alkali-resistant, and the junction between the throttle valve assembly 5 and its sealing cylindrical boss 17 also needs a smooth transition with a small taper surface and polished edges, which is also to avoid damage to the throttle valve assembly 5 and the pressure-bearing cylinder 3 due to relative movement and ensure reliable sealing.

[0051] When the lower end face of the throttle valve assembly 5 is in contact with the upper end face of the lower spindle 4, it is an end face seal for upward impact and pressure holding, which is equivalent to an internal seal during upward impact; when the upper end face of the throttle valve assembly 5 is in contact with the step face of the intermediate spindle 2 or the lower end face of the upper spindle 1, it is an end face seal for downward impact and pressure holding, which is equivalent to an internal seal during downward impact. Therefore, the upper end face and lower end face of the throttle valve assembly 5, the upper end face of the lower spindle 4 matched therewith, the step face of the intermediate spindle 2 matched therewith, or the lower end face of the upper spindle 1 matched therewith are all metal sealing surfaces with high surface roughness, wear resistance, acid and alkali resistance.

[0052] The throttle valve assembly 5 of the first embodiment has a leakage channel hole 14 axially arranged at the middle wall, a liquid flow channel axially arranged on the inner wall, and an upper leakage hole 22 and a lower leakage hole 23 connected to the leakage channel hole 14 are radially arranged at both ends of the leakage channel hole 14 to form an unobstructed pressure-holding leakage channel.

[0053] The throttle valve assembly 5 of the second embodiment has a modular tube 8 axially arranged at the middle wall, a liquid flow channel axially arranged on the inner wall, and a leakage hole 21 connected to the modular tube 8 radially arranged at the bottom end of the modular tube 8 to form a smooth pressure-holding leakage channel.

[0054] In the first embodiment, a single throttle valve assembly 5 controls the up and down movement of the bidirectional jar, and the single throttle valve assembly 5 is composed of a valve body 7 symmetrically provided with a hollow screw plug 11, a filter element 10, a single valve needle 9, and a valve body 7 with an up-strike valve needle hole 15 and a down-strike valve needle hole 16. The up and down movement and the up and down flow discharge clearance are controlled by the cooperation of a valve needle 9 with the up-strike valve needle hole 15 and the down-strike valve needle hole 16 of the valve body 7. Since the up-strike force of the bidirectional hydraulic jar is greater than the down-strike force, and the valve needle 9 is a valve needle, the size of the up-strike valve needle hole 15 of the valve body 7 is small, and the size of the down-strike valve needle hole 16 is large, so as to ensure the bidirectional jarring force and jarring delay time.

[0055] In the second embodiment, two throttle valves with the same structure are installed back to back together to form a throttle valve assembly 5, which is used to control the up and down movements of the two-way hydraulic jar. The difference is that the valve needle 9 is of different size, and the valve body 7, the filter element 10 and the hollow screw plug 11 are the same. Two valve needles 9 with different diameters are used to cooperate with the valve needle hole on the valve body 7 to adjust the upward shock force and the small shock force. Among them, the valve needle of the throttle valve arranged near the upper end face of the lower core shaft 4 is the upward shock valve needle 12, and the valve needle of the throttle valve arranged near the step surface of the middle core shaft 2 is the downward shock valve needle 13. Since the upward shock force of the two-way hydraulic jar is greater than the downward shock force, the gap between the valve needle 9 and the modular tube 8 is: the gap is small when it is struck upward, and the gap is large when it is struck downward. The valve needle 9 of the upward shock is larger, so the size of the upward shock valve needle 12 is larger than the size of the downward shock valve needle 13.

[0056] The working principle of the present invention is: Principle of upper strike: The principle of the first implementation is that when the upper spindle 1 is subjected to an upward pulling force, the spindle assembly moves upward relative to the outer cylinder part (pressure-bearing cylinder 3). Since the throttle valve assembly 5 can move axially between the lower spindle 4 and the middle spindle 2, the lower end surface of the throttle valve assembly 5 fits with the upper end surface of the lower spindle 4 of the spindle assembly to form an inner seal under the upward pulling force on the lower spindle 4 and the resistance of the upper hydraulic chamber. Under the action of the upward pulling force, the spindle assembly drives the throttle valve assembly 5 upward, so that the right starting point of the sealing cylindrical boss 17 at the upper end of the valve body 7 contacts the lower starting point of the inner convex cylindrical surface 6 of the pressure-bearing cylinder 3 to form an outer seal and start to strike upward to hold pressure. At this time, the liquid in the low-pressure cavity of the lower cavity flows from the lower cavity through the upward leakage hole 22 of the throttle valve assembly 5 into the leakage channel hole 14 of the valve body 7 to discharge to the upper high-pressure cavity. When the core shaft assembly drives the left end point of the lower sealing cylindrical boss 17 of the throttle valve assembly 5 to separate from the upper end starting point of the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 to form an upward impact pressure release point, and separates from the upward impact pressure release point, the upward impact pressure ends, and the core shaft component drives the throttle valve assembly 5 to accelerate upward instantly to form an upward shock, and the time of the upward pressure holding movement is the upward impact delay.

[0057] The principle of upward strike of the second embodiment: when the upper spindle 1 is subjected to an upward pulling force, the spindle assembly moves upward relative to the outer cylinder part (pressure-bearing cylinder 3). Since the throttle valve assembly 5 can move axially between the lower spindle 4 and the middle spindle 2, the lower end surface of the throttle valve assembly 5 is attached to the upper end surface of the lower spindle 4 of the spindle assembly under the upward pulling force and the resistance of the upper hydraulic chamber. Under the action of the upward pulling force, the spindle assembly drives the right starting point of the sealing cylindrical boss 17 of the lower end throttle valve to contact the lower end starting point of the inner convex cylindrical surface 6 of the pressure-bearing cylinder 3 to form an external seal and start to strike upward to hold the pressure. At this time, the liquid in the low-pressure cavity of the lower cavity flows from the lower cavity through the leakage hole 21 of the throttle valve at the lower end of the throttle valve assembly 5 and enters the leakage channel hole 14 of the valve body 7 to discharge to the upper high-pressure cavity. When the core shaft assembly drives the left end point of the sealing cylindrical boss 17 of the lower end throttle valve to separate from the upper end starting point of the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 to form an upward strike pressure release point, and separates from the upward strike pressure release point, the upward strike pressure ends, and the core shaft component drives the throttle valve assembly 5 to accelerate upward instantly to form an upward shock, and the time of the upward pressure holding movement is the upward strike delay.

[0058] Principle of downstroke: The principle of downward strike of the first embodiment: when the upper spindle 1 is subjected to downward thrust, the spindle assembly moves downward relative to the outer cylinder part (pressure-bearing cylinder 3). Since the throttle valve assembly 5 can move axially between the lower spindle 4 and the middle spindle 2, the upper end surface of the throttle valve assembly 5 is in contact with the step surface of the middle spindle 2 of the spindle assembly or the lower end surface of the upper spindle 1 to form an inner seal under the downward thrust of the lower spindle 4 and the resistance of the lower end hydraulic chamber. Under the continued downward thrust, the spindle assembly drives the left starting point of the upper end sealing cylindrical boss 17 of the valve body 7 of the throttle valve assembly 5 to contact the upper end starting point of the inner convex cylindrical surface 6 of the pressure-bearing cylinder 3 to form an outer seal and start to strike downward to hold pressure. At this time, the liquid in the low-pressure cavity of the upper cavity flows from the upper cavity through the downward strike leakage hole 23 of the throttle valve assembly 5 into the leakage channel hole 14 of the valve body 7 to discharge to the high-pressure cavity at the lower end. When the core shaft assembly drives the right end point of the upper sealing cylindrical boss 17 of the valve body 7 of the throttle valve assembly 5 to separate from the lower end point of the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 to form a downward strike pressure release point, and separates from the downward strike pressure release point, the downward strike pressure ends, and the core shaft component drives the throttle valve assembly 5 to accelerate downward instantly to form a downward shock, and the time of the downward pressure-holding movement is the downward strike delay.

[0059] The principle of the downward strike of the second embodiment: when the upper spindle 1 is subjected to a downward thrust, the spindle assembly moves downward relative to the outer cylinder part (pressure-bearing cylinder 3). Since the throttle valve assembly 5 can move axially between the lower spindle 4 and the middle spindle 2, the upper end surface of the throttle valve assembly 5 is in contact with the step surface of the middle spindle 2 of the spindle assembly or the lower end surface of the upper spindle 1 to form an inner seal under the downward thrust of the lower spindle 4 and the resistance of the lower end hydraulic chamber. Under the continued downward thrust, the spindle assembly drives the left starting point of the sealing cylindrical boss 17 of the upper end throttle valve in the throttle valve assembly 5 to contact the upper starting point of the inner convex cylindrical surface 6 of the pressure-bearing cylinder 3 to form an outer seal and start to strike downward to hold the pressure. At this time, the liquid in the low-pressure cavity of the upper cavity flows from the upper cavity through the leakage hole 21 at the upper end of the throttle valve assembly 5 into the leakage channel hole 14 of the valve body 7 to discharge to the high-pressure cavity at the lower end. When the core shaft assembly drives the right end point of the sealing cylindrical boss 17 of the upper throttle valve to separate from the lower end point of the inner raised cylindrical surface 6 of the pressure-bearing cylinder 3 to form a downward strike pressure release point, the downward strike pressure is ended and the core shaft assembly drives the throttle valve assembly 5 to accelerate downward instantly to form a downward shock. The time of the downward pressure-holding movement is the downward strike delay.

Claims

1. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces, characterized in that: The invention comprises a pressure-bearing cylinder (3), wherein a core shaft assembly is movably installed inside the pressure-bearing cylinder (3), an inner convex cylindrical surface (6) is arranged in the middle of the inner hole of the pressure-bearing cylinder (3), the core shaft assembly comprises an upper core shaft (1), an intermediate core shaft (2), a lower core shaft (4) and a throttle valve assembly (5), the upper core shaft (1) and the lower core shaft (4) are fixedly connected at both ends of the intermediate core shaft (2), the throttle valve assembly (5) is sleeved on the outer circle of the middle part of the intermediate core shaft (2), and the upper and lower ends of the throttle valve assembly (5) are arranged with an upper matching sealing surface and a lower matching sealing surface, the outer diameter of the throttle valve assembly (5) in the core shaft assembly is larger than the outer diameters of other parts, when the outer cylindrical surface of the throttle valve assembly (5) contacts the inner convex cylindrical surface (6) of the pressure-bearing cylinder (3), an interference seal is formed between the two, and the leakage gap of the throttle valve assembly (5) when it is struck upward is smaller than the leakage gap when it is struck downward.

2. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces according to claim 1, characterized in that: The middle spindle (2) is threadedly sleeved on the upper spindle (1), and the lower spindle (4) is threadedly sleeved on the outer wall of the middle spindle (2); the outer periphery of the middle spindle (2) is a step-type structure, and the upper mating sealing surface and the lower mating sealing surface are respectively the step surface of the middle spindle (2) and the upper end surface of the lower spindle (4); Alternatively, the upper spindle (1) and the lower spindle (4) are both threadedly sleeved on the middle spindle (2), and the upper mating sealing surface and the lower mating sealing surface are respectively the lower end surface of the upper spindle (1) and the upper end surface of the lower spindle (4).

3. According to claim 1, a bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces, characterized in that: There is a gap between the inner hole of the throttle valve assembly (5) and the outer periphery of the middle spindle (2), and the length from the upper mating sealing surface to the lower mating sealing surface is greater than the length of the throttle valve assembly (5).

4. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces according to claim 1, characterized in that: The outer periphery, upper and lower end surfaces, upper mating sealing surface, lower mating sealing surface of the throttle valve assembly (5), and the inner raised cylindrical surface (6) of the pressure-bearing cylinder (3) are all subjected to wear-resistant and acid- and alkali-resistant surface strengthening treatment.

5. According to claim 1, a bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces, characterized in that: The junctions between the two sides of the inner raised cylindrical surface (6) and the inner hole wall of the pressure-bearing cylinder (3) are smoothly transitioned via a small taper surface, and the edges of the junctions are polished.

6. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces according to claim 1, characterized in that: The throttle valve assembly (5) includes two throttle valves arranged back to back. The two throttle valves have similar structures and include a cylindrical valve body (7). The valve body (7) is provided with a leakage channel hole (14). The bottom of the leakage channel hole (14) is connected to the outside through the leakage hole (21); a molded tube (8) is provided in the leakage channel hole (14), and a valve needle (9) is provided in the molded tube (8). A filter element (10) and a hollow screw plug (11) are installed in the leakage channel hole (14) at the outer end of the molded tube (8) in sequence, wherein the valve needle (9) of the throttle valve arranged near the upper end surface of the lower spindle (4) is an upward striking valve needle (12), and the valve needle (9) of the throttle valve arranged near the step surface of the middle spindle (2) is a downward striking valve needle (13), and the size of the upward striking valve needle (12) is larger than the size of the downward striking valve needle (13).

7. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces according to claim 6, characterized in that: The upper striking valve needle (12) and the lower striking valve needle (13) are both clearance-fitted with the molded tube (8); a sealing cylindrical boss (17) is provided on the outer periphery of the valve body (7), and the sealing cylindrical boss (17) is located at the maximum outer diameter of the valve body (7).

8. According to claim 1, a bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces, characterized in that: The throttle valve assembly (5) comprises a cylindrical valve body (7), the valve body (7) being provided with a leakage channel hole (14) penetrating through both end surfaces thereof along its axial direction, the leakage channel hole (14) comprising a valve needle hole in the middle, a valve needle (12) being provided in the valve needle hole, the valve needle hole being composed of an upper valve needle hole (15) and a lower valve needle hole (16), the aperture of the upper valve needle hole (15) being smaller than the aperture of the lower valve needle hole (16).

9. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces according to claim 8, characterized in that: The leakage channel hole (14) further comprises a filter element mounting hole and a screw plug mounting hole respectively arranged at the outer ends of the upper striking valve needle hole (15) and the lower striking valve needle hole (16), wherein a filter element (10) and a hollow screw plug (11) are respectively arranged in the filter element mounting hole and the screw plug mounting hole, and a leakage channel communicating with the outside is radially arranged at both screw plug mounting holes, and the leakage channel is divided into an upper striking leakage hole (22) and a lower striking leakage hole (23).

10. A bidirectional hydraulic jar with a single cylinder controlling different up and down jarring forces according to claim 8, characterized in that: A sealing cylindrical boss (17) is provided on the outer circumference of the valve body (7) near the two end surfaces, respectively. The outer diameter of the sealing cylindrical boss (17) is larger than the outer diameter of the valve body (7) on both sides thereof. The outer wall of the valve body (7) between the two sealing cylindrical bosses (17) forms a middle flow surface (18). A plurality of pressure balancing holes (19) are provided on the outer circumference of the valve body (7) at the middle flow surface (18). The pressure balancing holes (19) are connected to the inner hole of the valve body (7). A small conical angle surface is used to transition between the sealing cylindrical boss (17) and the valve body (7) on both sides thereof.

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