A safe flushing pipe jet pump impactor

Abstract

The present invention discloses a safe flushing pipe jet - suction impactor, which comprises an upper sub, a valve housing, an outer pipe of the core barrel, a spline sleeve and a spline shaft connected in sequence; there is a nozzle inside the upper sub, and there is a valve that can slide up and down and has a conical surface at the lower end inside the valve housing, and there is a core valve piston that can slide up and down and has a water channel inside the valve; there is a hammer shoulder and a flushing pipe inside the outer pipe of the core barrel, the inner part of the upper end of the hammer shoulder is connected with the core valve piston in a taper connection, and a conical surface is provided on the outside of the upper end to form a water drainage channel with the conical surface of the valve. The lower end of the hammer shoulder is thread - connected with the flushing pipe of a tubular structure. The core valve piston, the hammer shoulder and the flushing pipe are combined to form a percussion hammer, and there is an annular gap between the percussion hammer and the outer pipe of the core barrel; the hammer shoulder is provided with a breathing hole with one end communicating with the annular gap and the other end communicating with the flushing pipe. In the present invention, the percussion hammer is changed from solid to hollow tubular, and at the same time, the impact point of the percussion hammer is changed from the upper end of the outer pipe of the core barrel to the lower end, which not only shortens the length of the core - drilling tool, but also shortens the length of the impact - force transmission chain, reduces the energy loss, and improves the energy utilization efficiency of the impactor.

Description

Technical Field

[0001] The present invention relates to the technical field of safety coring tools in geological exploration, and particularly relates to a safe flush pipe jet pump impactor. Background Art

[0002] In the field of geological exploration coring work, side drilling coring is often carried out according to needs. In this case, a certain angle is formed between the main hole and the side drilling coring tool. In this situation, there are two fatal problems:

[0003] One problem is that since there is an angle between the deviated section and the original borehole axis, the rock-breaking force required on the drill bit is only the component force of the active drilling pressure. Due to the influence of the side drilling bending curvature, the actual force received is very small, which cannot meet the rock-breaking requirements of the drill bit. In order to meet the rock-breaking force required on the side drilling drill bit, it is necessary to increase the drilling pressure, which brings potential safety hazards to the coring work and is prone to risks such as drill string breakage or borehole wall collapse.

[0004] Another problem is that the length of the coring tool will be affected by the side drilling build curvature radius, that is, if the coring tool is too long, it is not easy to pass through the build turning point.

[0005] The key to solving the above two problems is to change the force application method of the drill bit in the hole and shorten the length of the coring tool.

[0006] To change the force application method of the bottom hole drill bit, bottom hole pressurization must be achieved. For this purpose, either downhole power or in-hole throttling pressurization can be used. And the one that has these two dual functions at the same time is the jet pump impactor. First, the impact force generated by the jet pump impactor during operation can be applied to the drill bit. Secondly, its working nozzle itself has the function of throttling and boosting pressure, and can also apply a certain pressure to the drill bit.

[0007] However, the traditional jet pump impactor also has the following two problems: First, the traditional impactor itself has a certain length. Adding the length of the required coring tube, the whole set of drill tools becomes longer, which encounters the problem that the length of the coring tool is limited by the side drilling curvature radius. That is, under certain curvature radius conditions, if the coring tool is long, it is not easy to pass through the turning point. Secondly, the drill string is too long, and the impact force generated by the impactor is transmitted to the drill bit through the outer pipe. The longer the transmission chain, the more energy is consumed, resulting in the fact that the rock-breaking efficiency of the drill bit cannot be fully exerted. Summary of the Invention

[0008] The purpose of the present invention is to provide a flush pipe jet pump impactor for the above problems in the prior art, which can effectively shorten the length of the side drilling coring tool, reduce the energy loss of the impact force, and improve the energy utilization efficiency of the impactor.

[0009] The technical solution of the present invention is described in detail as follows:

[0010] A safety flushing pipe jet - suction impactor, comprising an upper sub (1), a valve housing (5), an outer core barrel (12), a spline sleeve (18) and a spline shaft (17) connected in sequence. Among them, the upper sub (1) is used to connect the whipstock drill tool, and the spline shaft (17) is used to connect the drill bit;

[0011] A nozzle (2) is installed inside the upper sub (1);

[0012] A valve (3) that can slide up and down relative to the valve housing (5) is installed inside the valve housing (5). A conical surface is provided at the lower end of the valve (3). A core - valve piston (4) that can slide up and down relative to the valve (3) is installed inside the valve (3). A water channel (b) communicating with the nozzle (2) is provided on the core - valve piston (4);

[0013] A hammer shoulder (6) and a flushing pipe (13) are installed inside the outer core barrel (12). The upper end inside of the hammer shoulder (6) is taper - connected to the core - valve piston (4). A conical surface is provided on the outside of the upper end of the hammer shoulder (6). A water - discharging channel communicating with the water channel (b) is formed between the conical surface of the hammer shoulder (6) and the conical surface of the valve (3). The lower end of the hammer shoulder (6) is thread - connected to the flushing pipe (13). The flushing pipe (13) is of a tubular structure. The core - valve piston (4), the hammer shoulder (6) and the flushing pipe (13) are combined to form a hammer. A ring gap is left between the hammer and the outer core barrel (12) for the liquid coming from the water channel (b) and the water - discharging channel to pass through and flow towards the drill bit;

[0014] The hammer shoulder (6) is provided with a breathing hole (7). One end of the breathing hole (7) communicates with the ring gap between the hammer and the outer core barrel (12), and the other end communicates with the flushing pipe (13).

[0015] Optionally or preferably, in the above - mentioned safety flushing pipe jet - suction impactor, an upper guide ring (8) with a water channel is provided at the connection between the hammer shoulder (6) and the flushing pipe (13).

[0016] Optionally or preferably, in the above - mentioned safety flushing pipe jet - suction impactor, a lower centralizing ring (15) is provided at the connection between the lower end of the flushing pipe (13) and the outer tube (12) to prevent the lower part of the flushing pipe (13) from swinging. The lower centralizing ring (15) is provided with a water channel, which not only plays a role in centralizing but also ensures the smoothness of the water path.

[0017] Optionally or preferably, in the above - mentioned safety flushing pipe jet - suction impactor, a lining core barrel (14) is also installed inside the flushing pipe (13). An inner tube plug (9) is inserted at the upper end of the lining core barrel (14), and the lower end of the lining core barrel (14) is inserted into the spline shaft (17).

[0018] Optionally or preferably, in the above-mentioned safety flush pipe jet-suction impactor, a first cylindrical sliding guiding structure (D) is provided at the lower end of the hammer shoulder (6); the inner pipe plug (9) is located within the first cylindrical sliding guiding structure (D) and can slide up and down relative to the first cylindrical sliding guiding structure (D); the inner pipe plug (9) is provided with a one-way ball valve (11), and a ball valve spring (10) is connected to the upper end of the one-way ball valve (11) and contacts the inner top surface of the first cylindrical sliding guiding structure (D); the first cylindrical sliding guiding structure (D) and the inner pipe plug (9) together form a dissolution cavity (V).

[0019] Optionally or preferably, in the above-mentioned safety flush pipe jet-suction impactor, the other end of the breathing hole (7) communicates with the dissolution cavity (V) inside the flush pipe (13).

[0020] Optionally or preferably, in the above-mentioned safety flush pipe jet-suction impactor, strip-shaped diameter-preserving blocks (16) are inlaid on the outer circumference of the spline sleeve (18), and the diameter-preserving blocks (16) are made of wear-resistant materials.

[0021] Optionally or preferably, in the above-mentioned safety flush pipe jet-suction impactor, a second cylindrical sliding guiding structure (E) is provided at the lower end of the spline sleeve (18), which is in sliding fit with the outer part of the upper end of the drill bit. The drill bit can slide up and down and can also prevent the drill bit from swinging.

[0022] Compared with the prior art, the safety flush pipe jet-suction impactor of the present invention has the following beneficial effects:

[0023] 1. Instead of using the traditional solid impact hammer design, the impact hammer of the present invention is composed of a core valve piston, a hammer shoulder and a flush pipe. The flush pipe is a tubular structure. In addition to meeting the function of the impact hammer, it can also accommodate the core barrel. Therefore, the length of the side drilling and coring tool is shortened, which is beneficial to passing through the turning point of the side drilling point.

[0024] 2. The impact point of the impact hammer of the present invention is transferred from the upper end of the core barrel to the lower end of the core barrel, that is, the lower end of the flush pipe impacts the spline shaft, and the impact force is transmitted to the drill bit, shortening the length of the impact force transmission chain, reducing the energy loss, and improving the energy utilization efficiency of the impactor.

[0025] 3. Make full use of the throttling and pressure-increasing effect of the nozzle of the jet-suction impactor (such as Figure 4 ) to directly apply hydraulic pressure to the drill bit, and together with the impact dynamic pressure generated by the impactor, it can effectively meet the drilling needs of the drill bit. At the same time, it can improve the stress conditions of the drilling tool at the deflecting and turning parts. The drilling tool is not easy to break, and the borehole is not easy to collapse, ensuring the safety of side drilling and coring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic cross-sectional structure diagram of the safety flush pipe jet-suction impactor in the embodiment;

[0027] Figure 2 It isFigure 1 Schematic diagram of the cross-sectional structure of A-A in

[0028] Figure 3 It is a schematic diagram of the structures of the upper guide ring 8 and the lower centralizing ring 15;

[0029] Figure 4 It is a schematic diagram of throttling and supercharging;

[0030] Figure 5 Schematic diagram showing the working principle of the safety flushing pipe jetting impactor, where (1) is the state where the flushing fluid sprays out from the nozzle 2 to form an entrainment state, and (2) is the state where the core valve piston 4 moves upward to close the water discharge channel.

[0031] In the figure:

[0032] 1 - upper sub; 2 - nozzle; 3 - valve; 4 - core valve piston; 5 - valve housing; 6 - hammer shoulder; 7 - breathing hole; 8 - upper guide ring; 9 - inner pipe plug; 10 - ball valve spring; 11 - ball valve; 12 - outer pipe of core barrel; 13 - flush pipe; 14 - inner lining core barrel; 15 - lower centralizing ring; 16 - gauge protection strip; 17 - spline shaft; 18 - spline sleeve; 19 - circlip retaining ring; 20 - circlip; 21 - drill bit; 31, 41 - sealing materials; a - limiting convex ring; b - water channel; c - inner step; D - first cylindrical sliding guiding structure; E - second cylindrical sliding guiding structure; V - dissolution cavity; P1 and P2 are the pressures above and below the nozzle respectively; V1 and V2 are the water flow velocities at the upper and lower ends of the nozzle respectively; d1 and d2 are the diameters of the upper and lower ends of the nozzle respectively; ΔP is the pressure of throttling and supercharging. Specific embodiments

[0033] The technical solution of the present invention will be explained and described in detail below in conjunction with the accompanying drawings and preferred embodiments, so that those skilled in the art can better understand the present invention and implement it.

[0034] Please refer to Figure 1 ,

[0035] A safety flushing pipe jetting impactor of an embodiment includes an upper sub 1, a valve housing 5, an outer pipe of core barrel 12, a spline sleeve 18 and a spline shaft 17 which are connected in sequence.

[0036] Both the upper and lower ends of the upper sub 1, the valve housing 5 and the outer pipe of core barrel 12 are threaded, and the upper end of the spline sleeve 18 is threaded. The upper end thread of the upper sub 1 is connected to the corresponding whipstock drill tool, the lower end thread of the upper sub 1 is connected to the upper end thread of the valve housing 5, the lower end thread of the valve housing 5 is connected to the upper end thread of the outer pipe of core barrel 12, the lower end thread of the outer pipe of core barrel 12 is connected to the upper end thread of the spline sleeve 18, the lower end of the spline sleeve 18 is connected to the spline shaft 17 through a spline, and the lower end of the spline shaft 17 is connected to the drill bit 21 through a thread.

[0037] The nozzle 2 is installed inside the upper joint 1, and the two are also connected by screw threads.

[0038] There is a limiting convex ring a inside the valve housing 5. A valve 3 that can slide up and down relative to the valve housing 5 is installed on the limiting convex ring a. An inner step c is provided on the inner wall of the valve 3 for installing the core valve piston 4, and the core valve piston 4 can slide up and down relative to the valve 3.

[0039] The core valve piston 4 is provided with a water channel b. The upper end of the water channel b communicates with the nozzle 2, and the lower end leads to the annular space gap between the core valve piston 4 and the valve 3. The valve 3 is provided with a sealing material 31, and the core valve piston 4 is provided with a sealing material 41. The sealing material 31 is used for sealing the contact position between the valve 3 and the valve housing 5, and the sealing material 41 is used for sealing the contact position between the core valve piston 4 and the valve 3.

[0040] A hammer shoulder 6 and a wash pipe 13 are installed inside the outer core barrel 12. The core valve piston 4, the hammer shoulder 6 (including the first cylindrical sliding guiding structure D) and the wash pipe 13 are combined to form a percussion hammer.

[0041] The upper part of the hammer shoulder 6 is in a conical structure. The upper end of the hammer shoulder 6 is connected to the core valve piston 4 in a tapered manner. This connection has a self-locking angle, and the percussion hammer becomes more tightly connected as it impacts, ensuring that the percussion hammer does not fall off. The lower end of the hammer shoulder 6 is provided with a first cylindrical sliding guiding structure D, and the first cylindrical sliding guiding structure D is threadedly connected to the wash pipe 13 by screw threads. The hammer shoulder 6 is also provided with a breathing hole 7. One end of the breathing hole 7 communicates with the solution cavity V inside the first cylindrical sliding guiding structure D of the hammer shoulder 6, and the other end communicates with the annular gap between the valve housing 5 and the valve 3. Its function is that when the percussion hammer impacts downward, the variable gap between the first cylindrical sliding guiding structure D and the inner pipe plug 9, that is, the volume of the solution cavity V, shrinks, and the stored water needs to be discharged from the breathing hole 7 (spit out water), otherwise it will hinder the downward movement of the percussion hammer. When the percussion hammer moves upward, the volume of the solution cavity V becomes larger, and water needs to be replenished through the breathing hole 7 (absorb water), otherwise a vacuum will be formed, which is not conducive to the smooth upward movement of the percussion hammer. For each impact cycle action of the percussion hammer, the breathing hole correspondingly completes one water spitting and water absorbing action, just like breathing. At the connection between the hammer shoulder 6 and the wash pipe 13, there is an upper guiding ring 8, and its structure is as Figure 3 , and its function is to ensure the coaxiality of the wash pipe 13 and the core valve piston 4.

[0042] The wash pipe 13 is a tubular structure. An inner lining core barrel 14 is also installed inside the wash pipe 13. The upper end of the inner lining core barrel 14 is inserted with an inner pipe plug 9, and the lower end of the inner lining core barrel 14 is inserted with a spline shaft 17. The inner pipe plug 9 is located inside the first cylindrical sliding guiding structure D. The main function of this guiding structure is to prevent the inner lining core barrel 14 from swinging through the inner pipe plug 9, and it can slide up and down relative to the first cylindrical sliding guiding structure D; the inner pipe plug 9 is provided with a one-way ball valve 11, and the upper end of the one-way ball valve 11 is connected with a ball valve spring 10 and contacts the inner top surface of the first cylindrical sliding guiding structure D.

[0043] A lower stabilizing ring 15 is provided at the connection between the lower end of the flushing pipe 13 and the outer tube 12 of the core tube. The inner side of the lower stabilizing ring 15 has a water channel, and its structure is the same as that of the upper guiding ring 8 (such as Figure 3 Specifically, an inner step is provided at the lower end of the core tube outer tube 12 , and the lower stabilizing ring 15 is fixed at the inner step at the lower end of the core tube outer tube 12 and supported by the top end of the spline sleeve 18 .

[0044] The outer periphery of the spline sleeve 18 is inlaid with a plurality of gauge bars 16, which are made of wear-resistant material. The lower end of the spline sleeve 18 is provided with a second cylindrical sliding guide structure E, which slides with the outer cylindrical surface of the upper end of the drill bit to prevent the drill bit 21 from swinging.

[0045] A retaining ring 20 is arranged inside the inner conical surface of the drill bit 21, and a retaining ring 19 is arranged above the retaining ring.

[0046] Please refer to Figure 5 The working principle of the present invention is as follows: when the flushing liquid is sent to the nozzle 2, a jet Q is formed and sprayed out from the nozzle 2, and the sprayed jet Q forms a suction around the periphery, such as Figure 5 (I) As the surrounding liquid is sucked up to form a negative pressure, the valve 3 and the core valve piston 4 are sucked up by the negative pressure and move upward, and the flushing pipe 13 also moves upward with the core valve piston 4. At this time, the flushing liquid flows through the branch hole at the water channel point b of the core valve piston 4, flows through the hammer shoulder 6, and then flows to the bottom hole drill bit 21 through the annular gap between the core tube outer tube 12 and the flushing pipe 13. When the valve 3 moves up to the limit vertex, it stops moving. If the core valve piston 4 continues to move upward, it will close the channel between the conical surface of the hammer shoulder 6 and the conical surface at the lower end of the valve 3. Figure 5 (ii) Since the drain channel is suddenly closed, a water hammer pressure p is immediately formed under the nozzle 2, pushing the valve 3 and the core valve piston 4 downward. When the valve 3 descends to the limit convex ring a, it is restricted from descending, and the core valve piston 4 and the flushing pipe 13 continue to descend under the action of inertia, causing the conical surface of the hammer shoulder 6 to separate from the conical surface of the lower end of the valve 3, and the water channel is opened.

[0047] The core valve piston 4+punch pipe 13, under the inertia of the downward movement, until the punch pipe 13 hits the spline shaft 17, and then transmits the impact force to the drill bit 21. At this time, it returns to Figure 5 (A) state, proceed to the next action, and repeat the cycle.

[0048] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. A safe flushing pipe jet - pump impactor, characterized in that, It includes an upper sub (1), a valve housing (5), an outer core barrel (12), a spline sleeve (18) and a spline shaft (17) connected in sequence. Among them, the upper sub (1) is used to connect the whipstock drill tool, and the spline shaft (17) is used to connect the drill bit; A nozzle (2) is installed inside the upper sub (1); A valve (3) that can slide up and down relative to the valve housing (5) is installed inside the valve housing (5). A conical surface is provided at the lower end of the valve (3); A core valve piston (4) that can slide up and down relative to the valve (3) is installed inside the valve (3). The core valve piston (4) is provided with a water channel (b) communicating with the nozzle (2); A hammer shoulder (6) and a wash pipe (13) are installed inside the outer core barrel (12). The upper end inside of the hammer shoulder (6) is taper-connected to the core valve piston (4). A conical surface is provided outside the upper end of the hammer shoulder (6). A water discharge channel that can communicate with the water channel (b) is formed between the conical surface of the hammer shoulder (6) and the conical surface of the valve (3); The lower end of the hammer shoulder (6) is thread-connected to the wash pipe (13). The wash pipe (13) is a tubular structure; The core valve piston (4), the hammer shoulder (6) and the wash pipe (13) are combined to form a percussion hammer. An annular gap is left between the percussion hammer and the outer core barrel (12) for the liquid coming from the water channel (b) and the water discharge channel to pass through and flow to the drill bit; The hammer shoulder (6) is provided with a breathing hole (7). One end of the breathing hole (7) communicates with the annular gap between the percussion hammer and the outer core barrel (12), and the other end communicates with the wash pipe (13).

2. The safety flush pipe jet pump shocker according to claim 1, characterized in that, A upper guide ring (8) with a water channel is provided at the connection between the hammer shoulder (6) and the wash pipe (13).

3. The safety flush pipe jet pump impactor according to claim 1, characterized in that, A lower guide ring (15) for preventing the lower end of the wash pipe (13) from swinging is provided at the connection between the lower end of the wash pipe (13) and the outer pipe (12). The lower guide ring (15) is provided with a water channel.

4. The safety flush pipe jet pump impactor according to claim 1, characterized in that, A lining core barrel (14) is also installed inside the wash pipe (13). An inner pipe plug (9) is inserted at the upper end of the lining core barrel (14), and the lower end of the lining core barrel (14) is inserted into the spline shaft (17).

5. The safety flush pipe jet pump shocker according to claim 4, characterized in that, A first cylindrical sliding guide structure (D) is provided at the lower end of the hammer shoulder (6); The inner pipe plug (9) is located inside the first cylindrical sliding guide structure (D) and can slide up and down relative to the first cylindrical sliding guide structure (D); The inner pipe plug (9) is provided with a one-way ball valve (11). The upper end of the one-way ball valve (11) is connected with a ball valve spring (10) and contacts the inner top surface of the first cylindrical sliding guide structure (D); The first cylindrical sliding guide structure (D) and the inner pipe plug (9) together form a dissolution cavity (V).

6. The safety flush pipe jet pump shocker according to claim 5, characterized in that, The other end of the breathing hole (7) communicates with the dissolution cavity (V) inside the wash pipe (13).

7. The safety flushing pipe jet pump shocker according to claim 1, wherein The outer circumference of the spline sleeve (18) is wrapped with a gauge protection strip (16), and the gauge protection strip (16) is made of wear-resistant material.

8. The safety flush pipe jet pump shocker according to claim 1, characterized in that, A second cylindrical sliding guide structure (E) for restricting the swing of the drill bit is provided at the lower end of the spline sleeve (18).

Images