Underground transient flow smoothing device and directional rotary steering drilling tool

Abstract

The invention relates to the field of underground measurement while drilling in petroleum drilling, in particular to an underground transient flow smoothing device and a directional rotary steering drilling tool, a piston outer barrel is sleeved outside a piston inner barrel at intervals, a gap is arranged between the piston outer barrel and the piston inner barrel, and a tubular shell is sleeved on the piston outer barrel in a sealing manner; the annular piston and the spring are arranged between the piston inner cylinder and the piston outer cylinder in a sleeved mode, the annular piston is in sliding seal with the outer wall of the piston inner cylinder and the inner wall of the piston outer cylinder, and the spring is arranged between the annular piston and the liquid outlet end of the piston inner cylinder. The device has the beneficial effects that when the liquid inlet end liquid inlet is suddenly increased, the spring is compressed, the flow is stored in a mechanical energy mode through the spring, and when the flow is instantaneously reduced, potential energy stored in the spring is released, so that the flow is maintained in a stable state, mud displacement fluctuation is reduced, relatively stable flow input is provided for a power generator, and the service life of the power generator is prolonged. Therefore, under the condition that the load is fixed, the output end of the generator can obtain stable voltage output.

Description

Technical Field

[0001] The invention relates to the field of downhole measurement while drilling in oil drilling, and in particular to a downhole transient flow smoothing device and a directional rotary steering drilling tool. Background Art

[0002] In recent years, the advantages of rotary steering technology in unconventional oil and gas exploration and development have become increasingly prominent. Compared with the "push-and-lean" type, the "pointing" rotary steering has the technical advantages of clean wellbore, smooth trajectory, strong wellbore extension ability, and high soft formation deflection rate. It can perform open hole sidetracking in expanded or eroded wellbore. It is an ideal system for high-efficiency and high-yield drilling in soft interlayers and other formations. It is a technical tool to improve wellbore quality, increase long horizontal sections, and increase the drilling rate of high-quality reservoirs.

[0003] Unlike push-type rotary steerable tools, pointing rotary steerable tools usually rely on high-power motors to control the changes in the tool face. This working method is flexible and accurate, but requires a high-power generator underground to provide electricity, and the power and voltage remain relatively stable. However, since the existing underground information transmission usually relies on mud channels to transmit information by changing the mud flow, the mud flow rate will fluctuate violently during information transmission. This fluctuation causes a drastic change in the output voltage of the turbine-driven generator, which affects or even damages the normal operation of the rotary steerable electronic control system. Suppressing the drastic fluctuation of the generator output voltage is crucial for the use of pointing rotary steerable tools. There are two ways to solve this problem. One is to start from the generator input and suppress the fluctuation of the flow; the other is to start from the generator output and convert the fluctuating voltage into a stable voltage through voltage stabilization technology. However, high-power voltage stabilization technology requires a large space, and the existing voltage stabilization technology cannot achieve high-power voltage stabilization in a small space underground. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a downhole transient flow smoothing device to solve the problem that the power supply output of the current directional rotary steering tool generator is interfered by the MWD transmission tool.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a downhole transient flow smoothing device comprises a piston inner tube, a piston outer tube, an annular piston, a spring and a tubular shell, wherein the piston outer tube is sleeved outside the piston inner tube at intervals, a gap is provided between the piston outer tube and the piston inner tube, the tubular shell is sealingly sleeved on the piston outer tube, one end of the piston inner tube is a liquid inlet end, and the other end is a liquid outlet end, and the outer wall of the liquid outlet end of the piston inner tube is sealedly connected with the inner wall of the piston outer tube; the annular piston and the spring are both sleeved between the piston inner tube and the piston outer tube, the annular piston and the outer wall of the piston inner tube and the inner wall of the piston outer tube are all slidingly sealed, and the spring is provided between the annular piston and the liquid outlet end of the piston inner tube, and is used to apply an elastic force to the annular piston in the direction of the liquid inlet end of the piston inner tube.

[0006] The beneficial effects of the present invention are: reducing the fluctuation of mud discharge volume, thereby providing a relatively stable flow input to the generator, so that under the condition of a certain load, the output end of the generator can obtain a stable voltage output.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, an annular outer convex seat is fixedly provided on the outer wall of the liquid outlet end of the piston inner tube, one end of the piston outer tube extends to abut the side wall of the annular outer convex seat, and the outer peripheral wall of the annular outer convex seat is sealingly abutted against the inner wall of the tubular shell.

[0009] The beneficial effect of adopting the above further solution is that the setting of the annular outer convex seat can provide support for the setting of the spring, ensuring that the annular piston can store the instantaneous increased flow rate in the form of mechanical energy through the spring when the liquid inlet end of the piston inner tube suddenly increases.

[0010] Furthermore, an annular outer convex seat is fixedly provided on the outer wall of the liquid outlet end of the piston inner tube, and the outer wall of the annular outer convex seat is in sealing contact with the inner wall of the piston outer tube.

[0011] The beneficial effect of adopting the above further solution is that the setting of the annular outer convex seat can provide support for the setting of the spring, ensuring that the annular piston can store the instantaneous increased flow rate in the form of mechanical energy through the spring when the liquid inlet end of the piston inner tube suddenly increases.

[0012] Furthermore, a first stopper for limiting the movement of the piston outer cylinder and the piston inner cylinder is provided on the inner wall of the tubular housing.

[0013] The beneficial effect of adopting the above further solution is that the provision of the first stopper can limit the positions of the piston outer tube and the piston inner tube in the tubular housing to prevent relative sliding.

[0014] Furthermore, the first stopper is a limit pin, and the limit pin is fixed on the inner wall of the tubular shell.

[0015] The beneficial effect of adopting the above further solution is that the first stopper adopts a limit pin, which has a simple structure and is easy to install.

[0016] Furthermore, an end of the gap close to the liquid outlet end of the piston inner tube is provided with a through hole communicating with the outside of the tubular shell.

[0017] The beneficial effect of adopting the above further scheme is that the provision of the through hole can, on the one hand, prevent the air in the enclosed gap from blocking the movement of the annular piston and affecting the sliding displacement of the annular piston; on the other hand, it can balance the external pressure of the tubular shell with the internal fluid pressure of the piston inner tube, thereby achieving compensation for the bottom hole pressure.

[0018] Furthermore, a second stopper is provided on the inner wall of the piston outer cylinder or the outer wall of the piston inner cylinder, and the second stopper is provided on the side of the annular piston facing the liquid inlet end of the piston inner cylinder.

[0019] The beneficial effect of adopting the above further solution is that the provision of the second stopper can limit the position of the annular piston and prevent the annular piston from escaping from the gap.

[0020] Furthermore, the second stopper is a limit pin fixed on the inner wall of the piston outer tube or the outer wall of the piston inner tube.

[0021] The beneficial effect of adopting the above further solution is that the second stop member adopts a limit pin, which has a simple structure and is easy to install.

[0022] Furthermore, the second stopper is a blocking ring fixed on the inner wall of the piston outer cylinder.

[0023] The beneficial effect of adopting the above further solution is that the second stopper adopts a blocking ring to achieve uniform blocking of the annular piston, preventing the annular piston from being locally offset under the action of the hydraulic pressure in the gap when the annular piston is locally assembled.

[0024] The present invention solves the above technical problems and also provides a directional rotary steerable drilling tool, comprising a while drilling measurement system, a directional rotary steerable device and a downhole transient flow smoothing device as described above, wherein the tubular shell is fixedly arranged between the while drilling measurement system and the directional rotary steerable device.

[0025] The beneficial effect of adopting the above scheme is: reducing the fluctuation of mud discharge volume, thereby providing a relatively stable flow input to the generator, so that under the condition of a certain load, the output end of the generator can obtain a stable voltage output. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 100. Downhole transient flow smoothing device; 1. Piston inner tube; 2. Piston outer tube; 3. Annular piston; 4. Spring; 5. Tubular housing; 6. Gap; 7. Liquid inlet end; 8. Liquid outlet end; 9. Annular outer convex seat; 10. First stopper; 11. Through hole; 12. Second stopper;

[0033] 200. Measurement while drilling system;

[0034] 300. Pointing type rotary guide device. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Embodiment 1

[0037] like Figure 1As shown, this embodiment discloses a downhole transient flow smoothing device 100, comprising a piston inner tube 1, a piston outer tube 2, an annular piston 3, a spring 4 and a tubular shell 5, wherein the piston outer tube 2 is sleeved outside the piston inner tube 1 at intervals, a gap 6 is provided between the piston outer tube 2 and the piston inner tube 1, the tubular shell 5 is sealingly sleeved on the piston outer tube 2, one end of the piston inner tube 1 is a liquid inlet end 7, and the other end is a liquid outlet end 8, the outer wall of the liquid outlet end 8 of the piston inner tube 1 is sealedly connected to the inner wall of the piston outer tube 2; the annular piston 3 and the spring 4 are both sleeved between the piston inner tube 1 and the piston outer tube 2 The annular piston 3 is slidably sealed against the outer wall of the piston inner tube 1 and the inner wall of the piston outer tube 2. The spring 4 is arranged between the annular piston 3 and the liquid outlet end 8 of the piston inner tube 1, and is used to apply an elastic force to the annular piston 3 in the direction of the liquid inlet end 7 of the piston inner tube 1. When the liquid inlet end 7 of the piston inner tube 1 suddenly increases, the downward fluid impacts the annular piston 3, the spring 4 is compressed, and the instantaneously increased flow rate is stored in the form of mechanical energy through the spring 4. When the flow rate decreases instantaneously, the potential energy stored in the spring 4 is released, so that the flow rate is maintained in a stable state, thereby reducing the output voltage fluctuation of the generator.

[0038] In this embodiment, an annular outer convex seat 9 is fixedly provided on the outer wall of the liquid outlet end 8 of the piston inner tube 1, and one end of the piston outer tube 2 extends to abut the side wall of the annular outer convex seat 9. The outer peripheral wall of the annular outer convex seat 9 is sealingly abutted against the inner wall of the tubular shell 5. The setting of the annular outer convex seat 9 can provide support for the setting of the spring 4, ensuring that the annular piston 3 can store the instantaneously increased flow rate in the form of mechanical energy through the spring 4 when the liquid inlet end 7 of the piston inner tube 1 suddenly increases.

[0039] In this embodiment, a first stopper 10 for limiting the movement of the piston outer cylinder 2 and the piston inner cylinder 1 is provided on the inner wall of the tubular housing 5, and the first stopper 10 is a limit pin, which is fixed on the inner wall of the tubular housing 5. Specifically, a pin hole is provided on the inner wall of the tubular housing 5 on the side of the piston outer cylinder 2 away from the annular outer convex seat 9, and a pin hole is provided on the inner wall of the tubular housing 5 on the side of the annular outer convex seat 9 away from the piston outer cylinder 2. The first stopper 10 is inserted into the pin hole, and the limit pin protrudes from the inner wall of the tubular housing 5. The two first stoppers 10 limit the two ends of the piston outer cylinder 2 and the piston inner cylinder 1 to prevent the piston outer cylinder 2 and the piston inner cylinder 1 from sliding in the tubular housing 5.

[0040] A through hole 11 connected to the outside of the tubular shell 5 is provided at one end of the gap 6 close to the liquid outlet end 8 of the piston inner tube 1. The setting of the through hole 11 can, on the one hand, prevent the air in the closed gap 6 from blocking the movement of the annular piston 3 and affecting the sliding displacement of the annular piston 3; on the other hand, it can balance the external pressure of the tubular shell 5 with the internal fluid pressure of the piston inner tube 1, thereby realizing compensation for the bottom hole pressure.

[0041] In this embodiment, a second stopper 12 is provided on the inner wall of the piston outer tube 2, and the second stopper 12 is arranged on the side of the annular piston 3 facing the liquid inlet end 7 of the piston inner tube 1. Specifically, a pin hole is provided on the inner wall of the piston outer tube 2, and the second stopper 12 is inserted into the pin hole.

[0042] Embodiment 2

[0043] like Figure 2 As shown, this embodiment discloses a downhole transient flow smoothing device 100, comprising a piston inner tube 1, a piston outer tube 2, an annular piston 3, a spring 4 and a tubular shell 5, wherein the piston outer tube 2 is sleeved outside the piston inner tube 1 at intervals, a gap 6 is provided between the piston outer tube 2 and the piston inner tube 1, the tubular shell 5 is sealingly sleeved on the piston outer tube 2, one end of the piston inner tube 1 is a liquid inlet end 7, and the other end is a liquid outlet end 8, the outer wall of the liquid outlet end 8 of the piston inner tube 1 is sealedly connected to the inner wall of the piston outer tube 2; the annular piston 3 and the spring 4 are both sleeved between the piston inner tube 1 and the piston outer tube 2 The annular piston 3 is slidably sealed against the outer wall of the piston inner tube 1 and the inner wall of the piston outer tube 2. The spring 4 is arranged between the annular piston 3 and the liquid outlet end 8 of the piston inner tube 1, and is used to apply an elastic force to the annular piston 3 in the direction of the liquid inlet end 7 of the piston inner tube 1. When the liquid inlet end 7 of the piston inner tube 1 suddenly increases, the downward fluid impacts the annular piston 3, the spring 4 is compressed, and the instantaneously increased flow rate is stored in the form of mechanical energy through the spring 4. When the flow rate decreases instantaneously, the potential energy stored in the spring 4 is released, so that the flow rate is maintained in a stable state, thereby reducing the output voltage fluctuation of the generator.

[0044] In this embodiment, an annular outer convex seat 9 is fixedly provided on the outer wall of the liquid outlet end 8 of the piston inner tube 1, and the outer wall of the annular outer convex seat 9 is sealingly abutted against the inner wall of the piston outer tube 2. The setting of the annular outer convex seat 9 can provide support for the setting of the spring 4, ensuring that the annular piston 3 can store the instantaneously increased flow rate in the form of mechanical energy through the spring 4 when the liquid inlet end 7 of the piston inner tube 1 suddenly increases.

[0045] In this embodiment, a first stopper 10 for limiting the movement of the piston outer cylinder 2 and the piston inner cylinder 1 is provided on the inner wall of the tubular housing 5, and the first stopper 10 is a limit pin, which is fixed on the inner wall of the tubular housing 5. Specifically, a pin hole is provided on the inner wall of the tubular housing 5 on the side of the piston outer cylinder 2 away from the annular outer convex seat 9, and a pin hole is provided on the inner wall of the tubular housing 5 on the side of the annular outer convex seat 9 away from the piston outer cylinder 2. The first stopper 10 is inserted into the pin hole, and the limit pin protrudes from the inner wall of the tubular housing 5. The two first stoppers 10 limit the two ends of the piston outer cylinder 2 and the piston inner cylinder 1 to prevent the piston outer cylinder 2 and the piston inner cylinder 1 from sliding in the tubular housing 5.

[0046] A through hole 11 connected to the outside of the tubular shell 5 is provided at one end of the gap 6 close to the liquid outlet end 8 of the piston inner tube 1. The setting of the through hole 11 can, on the one hand, prevent the air in the closed gap 6 from blocking the movement of the annular piston 3 and affecting the sliding displacement of the annular piston 3; on the other hand, it can balance the external pressure of the tubular shell 5 with the internal fluid pressure of the piston inner tube 1, thereby realizing compensation for the bottom hole pressure.

[0047] In this embodiment, a second stopper 12 is provided on the inner wall of the piston outer tube 2, and the second stopper 12 is arranged on the side of the annular piston 3 facing the liquid inlet end 7 of the piston inner tube 1. Specifically, a pin hole is provided on the inner wall of the piston outer tube 2, and the second stopper 12 is inserted into the pin hole.

[0048] Embodiment 3

[0049] like Figure 3 As shown, this embodiment makes the following improvements on the basis of the first embodiment: the second stop member 12 is fixed on the outer wall of the piston inner tube 1, a pin hole is provided on the outer wall of the liquid inlet end 7 of the piston inner tube 1, and the second stop member 12 is a limit pin fixedly inserted in the pin hole.

[0050] Embodiment 4

[0051] like Figure 4 As shown, this embodiment makes the following improvements on the basis of the first embodiment: a second stopper 12 is provided on the inner wall of the piston outer tube 2, and the second stopper 12 is arranged on the side of the annular piston 3 facing the liquid inlet end 7 of the piston inner tube 1, and the second stopper 12 is a blocking ring. Specifically, an annular groove is provided on the inner wall of the piston outer tube 2, and the blocking ring is a retaining spring clamped in the annular groove.

[0052] Embodiment 5

[0053] like Figure 5As shown, this embodiment discloses a directional rotary steerable drilling tool, including a measurement while drilling system 200, a directional rotary steerable device 300 and a downhole transient flow smoothing device 100 as described above, and the tubular shell 5 is fixedly arranged between the measurement while drilling system 200 and the directional rotary steerable device 300.

[0054] In the specific use of this embodiment, when the piston inner cylinder 1 passes a flow of 32L / s and the measurement while drilling (MWD) system 200 is working, the output voltage of the generator fluctuates between 320V and 370V after passing through the rectification and filtering circuit, which is 55% lower than the fluctuation (320V-430V) when the downhole transient flow smoothing device 100 is not used.

[0055] The present invention reduces the fluctuation of mud discharge volume, thereby providing a relatively stable flow input to the generator, so that under the condition of a certain load, the output end of the generator can obtain a stable voltage output.

[0056] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A downhole transient flow smoothing device, characterized in that: The invention comprises a piston inner cylinder (1), a piston outer cylinder (2), an annular piston (3), a spring (4) and a tubular shell (5); the piston outer cylinder (2) is sleeved outside the piston inner cylinder (1) at intervals; a gap (6) is provided between the piston outer cylinder (2) and the piston inner cylinder (1); the tubular shell (5) is sealingly sleeved on the piston outer cylinder (2); one end of the piston inner cylinder (1) is a liquid inlet end (7) and the other end is a liquid outlet end (8); the outer wall of the liquid outlet end (8) of the piston inner cylinder (1) is in contact with the piston outer cylinder (1); The annular piston (3) and the spring (4) are both sleeved between the piston inner cylinder (1) and the piston outer cylinder (2); the annular piston (3) and the outer wall of the piston inner cylinder (1) and the inner wall of the piston outer cylinder (2) are all slidably sealed; the spring (4) is arranged between the annular piston (3) and the liquid outlet end (8) of the piston inner cylinder (1) and is used to apply an elastic force to the annular piston (3) in the direction of the liquid inlet end (7) of the piston inner cylinder (1).

2. A downhole transient flow smoothing device according to claim 1, characterized in that: An annular outer convex seat (9) is fixedly provided on the outer wall of the liquid outlet end (8) of the piston inner tube (1), one end of the piston outer tube (2) extends to abut against the side wall of the annular outer convex seat (9), and the outer peripheral wall of the annular outer convex seat (9) is in sealing contact with the inner wall of the tubular shell (5).

3. A downhole transient flow smoothing device according to claim 1, characterized in that: An annular outer convex seat (9) is fixedly provided on the outer wall of the liquid outlet end (8) of the piston inner cylinder (1), and the outer wall of the annular outer convex seat (9) is in sealing contact with the inner wall of the piston outer cylinder (2).

4. A downhole transient flow smoothing device according to claim 1, characterized in that: A first stopper (10) for limiting the movement of the piston outer cylinder (2) and the piston inner cylinder (1) is provided on the inner wall of the tubular housing (5).

5. A downhole transient flow smoothing device according to claim 4, characterized in that: The first stopper (10) is a limit pin, and the limit pin is fixed on the inner wall of the tubular housing (5).

6. A downhole transient flow smoothing device according to any one of claims 1 to 5, characterized in that: An end of the gap (6) close to the liquid outlet end (8) of the piston inner cylinder (1) is provided with a through hole (11) communicating with the outside of the tubular housing (5).

7. A downhole transient flow smoothing device according to claim 6, characterized in that: A second stopper (12) is provided on the inner wall of the piston outer cylinder (2) or the outer wall of the piston inner cylinder (1), and the second stopper (12) is provided on the side of the annular piston (3) facing the liquid inlet end (7) of the piston inner cylinder (1).

8. A downhole transient flow smoothing device according to claim 7, characterized in that: The second stopper (12) is a limit pin fixed on the inner wall of the piston outer cylinder (2) or the outer wall of the piston inner cylinder (1).

9. A downhole transient flow smoothing device according to claim 7, characterized in that: The second stopper (12) is a blocking ring fixed on the inner wall of the piston outer cylinder (2).

10. A directional rotary steerable drilling tool, characterized in that: It comprises a measurement while drilling system (200), a directional rotary steering device (300) and a downhole transient flow smoothing device as described in any one of claims 1 to 9, wherein the tubular housing (5) is fixedly arranged between the measurement while drilling system (200) and the directional rotary steering device (300).

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