Downhole transient flow smoothing device and directional rotary steerable drilling tool

Abstract

The present 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 directional drilling tool, wherein a piston outer cylinder is sleeved outside a piston inner cylinder, a gap is provided between the piston outer cylinder and the piston inner cylinder, and a tubular shell sealing sleeve is provided on the piston outer cylinder; an annular piston and a spring are both sleeved between the piston inner cylinder and the piston outer cylinder, the annular piston and the outer wall of the piston inner cylinder and the inner wall of the piston outer cylinder are all slidably sealed, and the spring is provided between the annular piston and the liquid outlet end of the piston inner cylinder. The beneficial effect of the present invention is that when the liquid inlet end suddenly increases, the spring is compressed, and the flow is stored in the form of mechanical energy by the spring. When the flow decreases instantaneously, the potential energy stored in the spring is released, so that the flow is maintained in a stable state, the mud displacement fluctuation is reduced, and a relatively stable flow input is provided to the generator, so that under a constant load, the generator output end can obtain a stable voltage output.

Description

Technical Field

[0001] The present 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, rotary steerable technology has become increasingly prominent in unconventional oil and gas exploration and development. Compared to push-and-pull systems, point-and-pull rotary steerables offer advantages such as clean wellbore, smooth trajectory, strong wellbore extension capability, and high build-up rate in soft formations. They are capable of openhole sidetracking in expanded or washed-out wellbores, making them an ideal system for efficient and high-yield drilling in soft interbedded formations. They are a powerful tool for improving wellbore quality, increasing the number of long lateral sections, and increasing the penetration rate of high-quality reservoirs.

[0003] Unlike push-type rotary steerable tools, pointing rotary steerable tools typically rely on high-power motors to control toolface changes. This operating method offers flexible and precise adjustment, but requires a high-power generator downhole to provide power, and the power and voltage must remain relatively stable. However, existing downhole information transmission typically relies on mud channels, which transmit information by altering mud flow. This can cause significant fluctuations in mud flow, which in turn causes drastic changes in the output voltage of the turbine-driven generator, potentially affecting or even damaging the proper functioning of the rotary steerable's electronic control system. Suppressing these fluctuations in generator output voltage is crucial for the use of pointing rotary steerable tools. There are two approaches to addressing this issue: suppressing flow fluctuations at the generator input; or converting the fluctuating voltage at the generator output into a stable voltage through voltage stabilization technology. However, high-power voltage stabilization technology requires significant space, and existing voltage stabilization technologies are unable to achieve this in the confined downhole space. 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 with by the MWD transmission tool.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a downhole transient flow smoothing device, comprising a piston inner tube, a piston outer tube, an annular piston, a spring and a tubular shell, the piston outer tube is sleeved on the outside of the piston inner tube, and 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 the liquid inlet end, and the other end is the liquid outlet end, and the outer wall of the liquid outlet end of the piston inner tube is sealed 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, and 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 toward 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 a constant load, the output end of the generator can obtain a stable voltage output.

[0007] On the basis of 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 sealed and 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 tube and the piston inner tube 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 solution is that the provision of the through hole can, on the one hand, prevent the air in the enclosed gap from obstructing 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 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 hydraulic pressure in the gap when the annular piston is partially assembled.

[0024] The present invention solves the above technical problems and also provides a directional rotary steerable drilling tool, comprising a measurement while drilling 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 measurement while drilling system and the directional rotary steerable device.

[0025] The beneficial effect of adopting the above solution is: reducing the fluctuation of mud discharge volume, thereby providing a relatively stable flow input to the generator, so that under a constant 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 structural diagram of embodiment 1 of the present invention;

[0027] Figure 2 This is a structural diagram of embodiment 2 of the present invention;

[0028] Figure 3 This is a structural diagram of embodiment 3 of the present invention;

[0029] Figure 4 This is a structural diagram of a fourth embodiment of the present invention;

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

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

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

[0033] 200. Measurement while drilling system;

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

[0035] The principles and features of the present invention are described below with reference to 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] Example 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 on the outside of the piston inner tube 1 at intervals, and a gap 6 is provided between the piston outer tube 2 and the piston inner tube 1, and 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, and 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 provided 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 toward 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, and the spring 4 is compressed. The instantaneous increase in flow is stored in the form of mechanical energy by the spring 4. When the flow decreases instantaneously, the potential energy stored in the spring 4 is released, so that the flow is maintained in a stable state, thereby reducing the fluctuation of the generator output voltage.

[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 sealed and 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 instantaneous 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 is provided on the inner wall of the tubular housing 5 to limit the movement of the piston outer cylinder 2 and the piston inner cylinder 1. The first stopper 10 is a limit pin, and the limit pin is fixed to 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 protrusion 9, and a pin hole is provided on the inner wall of the tubular housing 5 on the side of the annular outer protrusion 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 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 within the tubular housing 5.

[0040] A through hole 11 communicating with 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 obstructing 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 achieving 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 provided 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] Example 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 on the outside of the piston inner tube 1 at intervals, and a gap 6 is provided between the piston outer tube 2 and the piston inner tube 1, and 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, and 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 provided 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 toward 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, and the spring 4 is compressed. The instantaneous increase in flow is stored in the form of mechanical energy by the spring 4. When the flow decreases instantaneously, the potential energy stored in the spring 4 is released, so that the flow is maintained in a stable state, thereby reducing the fluctuation of the generator output voltage.

[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 sealed and 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 instantaneous 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 is provided on the inner wall of the tubular housing 5 to limit the movement of the piston outer cylinder 2 and the piston inner cylinder 1. The first stopper 10 is a limit pin, and the limit pin is fixed to 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 protrusion 9, and a pin hole is provided on the inner wall of the tubular housing 5 on the side of the annular outer protrusion 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 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 within the tubular housing 5.

[0046] A through hole 11 communicating with 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 obstructing 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 achieving 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 provided 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] Example 3

[0049] like Figure 3 As shown, this embodiment makes the following improvements on the basis of embodiment one: 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] Example 4

[0051] like Figure 4 As shown, this embodiment makes the following improvements on the basis of embodiment one: a second stopper 12 is provided on the inner wall of the piston outer tube 2, 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 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] Example 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 the 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 a flow rate of 32 L / s passes through the piston inner cylinder 1 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 previous 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 a constant load condition, the output end of the generator can obtain a stable voltage output.

[0056] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like to 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, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A directional rotary steerable drilling tool, characterized in that: The invention comprises a measurement while drilling system (200), a directional rotary steering device (300) and a downhole transient flow smoothing device (100). The downhole transient flow smoothing device (100) comprises a piston inner tube (1), a piston outer tube (2), an annular piston (3), a spring (4) and a tubular shell (5). The piston outer tube (2) is sleeved on the outside of 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 sealed and 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 inlet end (8). The outer wall of the liquid outlet end (8) of the piston inner tube (1) and the inner wall of the piston outer tube (2) are sealed; 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) and the outer wall of the piston inner tube (1) and the inner wall of the piston outer tube (2) are all slidably sealed; the spring (4) is provided 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); 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); The through hole (11) passes through the side wall of the piston outer cylinder (2) and the side wall of the tubular housing (5); The tubular housing (5) is fixedly arranged between the measurement while drilling system (200) and the directional rotary steering device (300).

2. A directional rotary steerable drilling tool 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), and 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 abutment with the inner wall of the tubular shell (5).

3. The directional rotary steerable drilling tool 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. The directional rotary steerable drilling tool 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 directional rotary steerable drilling tool 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. The directional rotary steerable drilling tool according to claim 1, 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).

7. A directional rotary steerable drilling tool according to claim 6, 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).

8. The directional rotary steerable drilling tool according to claim 6, characterized in that: The second stopper (12) is a blocking ring fixed on the inner wall of the piston outer cylinder (2).

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