A drilling tool vibration energy recovery power generation device

Abstract

The present application belongs to the field of gas field drilling, and discloses a drilling tool vibration energy recovery power generation device. The device comprises a first connecting head, a second connecting head, an inner cylinder connected with the first connecting head and the second connecting head respectively, a piezoelectric unit and a buffer protection unit respectively sleeved on the inner cylinder, and an outer cylinder arranged on the outer periphery of the piezoelectric unit and the buffer protection unit. The piezoelectric unit and the buffer protection unit are in abutment. The buffer protection unit is configured to reciprocate in the axial direction in response to the vibration of the drilling tool, thereby driving the piezoelectric unit to generate a piezoelectric effect and output electric current. The present application can effectively recover and reuse the drilling tool vibration energy, so that the drilling tool vibration energy recovery power generation device can realize the cyclic utilization of energy during the working process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas field drilling, in particular to a drilling tool vibration energy recovery power generation device. BACKGROUND

[0002] With the development of artificial technology, digital, information-based and intelligent drilling technology emerges as the times require. The revolution of drilling technology also puts forward new requirements for traditional downhole measurement technology, making the measurement device gradually extend towards the trend of high-frequency acquisition, miniaturized design and distributed installation measurement.

[0003] The downhole measurement device in the prior art is generally large in size and needs to be matched with a turbine downhole generator for use, so that the downhole measurement device will generate huge hydraulic loss in the working process. In addition, due to the narrow space in the downhole, the matched power supply equipment will also greatly reduce the endurance time of the downhole measurement device. SUMMARY

[0004] The present application aims to provide a drilling tool vibration energy recovery power generation device which can effectively recover and reuse the drilling tool vibration energy, so that the drilling tool vibration energy recovery power generation device can realize the recycling of energy in the working process.

[0005] According to the present application, a drilling tool vibration energy recovery power generation device is provided, comprising a first connecting head for connecting with an upstream part of a drilling tool, a second connecting head for connecting with a downstream part of the drilling tool, an inner cylinder connected between the first connecting head and the second connecting head, a piezoelectric unit and a buffer protection unit respectively sleeved on the inner cylinder, the piezoelectric unit and the buffer protection unit being in abutment, and an outer cylinder provided on the outer periphery of the piezoelectric unit and the buffer protection unit, wherein the buffer protection unit is configured to reciprocate in the axial direction in response to the vibration of the drilling tool, thereby driving the piezoelectric unit to generate a piezoelectric effect and output an electric current.

[0006] In one embodiment, the buffer protection unit comprises a cylinder sleeve comprising an inner ring body and an outer ring body which are spaced apart from each other and connected at the bottom, an annular space being defined between the inner ring body and the outer ring body, the annular space being filled with a magneto-rheological fluid; a piston rod provided in the annular space; and a cylinder sleeve cover fixedly connected with the cylinder sleeve and closing the opening of the annular space.

[0007] In one embodiment, the piston rod is configured as a stepped sleeve and comprises a main body portion with a smaller diameter and an end step with a larger diameter, wherein the inner wall of the main body portion is fitted with the outer wall of the inner ring body of the cylinder sleeve, and the outer wall of the end step is fitted with the inner wall of the outer ring body, so as to divide the annular space into a first annular space and a second annular space.

[0008] In one embodiment, the end step is provided with a plurality of holes for connecting the first annular space and the second annular space, which are arranged on the same circumferential line.

[0009] In one embodiment, the buffer protection unit comprises a permanent magnet arranged in the annular space and in contact with the outer ring body, and a coil wound on the outer periphery of the cylinder sleeve, wherein the permanent magnet can act on the magnetorheological fluid through an excitation magnetic field.

[0010] In one embodiment, the piezoelectric unit comprises a ceramic stack assembly and a control assembly in communication with the ceramic stack assembly, the control assembly being electrically connected to the coil, wherein the ceramic stack assembly can output electric current in response to the vibration of the drilling tool for use by the load of the device.

[0011] In one embodiment, the load is the coil and the control assembly, and the control assembly can generate a magnetic field in the same direction or opposite direction of the permanent magnet through the coil, so as to superimpose the magnetic field of the permanent magnet to form a composite magnetic field and magnetize or demagnetize the permanent magnet respectively, thereby changing the state of the magnetorheological fluid.

[0012] In one embodiment, the buffer protection unit comprises a first spring arranged in the second annular space in the cylinder sleeve for supporting the reciprocating movement of the piston rod in the annular space.

[0013] In one embodiment, the buffer protection unit comprises a support table fixedly connected to the top end of the piston rod, and a second spring arranged between the support table and the cylinder sleeve cover.

[0014] In one embodiment, the inner diameter of the support table is greater than the outer diameter of the inner cylinder, and the outer diameter of the support table is less than the inner diameter of the outer cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be described in detail below with reference to the accompanying drawings, in which:

[0016] Figure 1 The structure of the drilling tool vibration energy recovery power generation device according to the present application is schematically shown;

[0017] Figure 2 The structure of the inner cylinder in the drilling tool vibration energy recovery power generation device according to the present application is schematically shown;

[0018] Figure 3 The structure of the buffer protection unit in the drilling tool vibration energy recovery power generation device according to the present application is schematically shown;

[0019] Figure 4Structure diagram of a piezoelectric unit in a drilling tool vibration energy recovery power generation device according to the present application;

[0020] Figure 5 Sectional view of a cylinder liner in a drilling tool vibration energy recovery power generation device according to the present application;

[0021] Figure 6 Sectional view of a cylinder liner cover in a drilling tool vibration energy recovery power generation device according to the present application.

[0022] In the drawings, the same components are designated by the same reference numerals. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0023] The present application will be further described below with reference to the drawings. For the convenience of description, the directional term "upstream" or similar directional term in the present specification refers to the direction close to the wellhead, i.e. the top end direction in Figure 1 ; and the directional term "downstream" or similar directional term refers to the direction away from the wellhead, i.e. the bottom end direction in Figure 1 .

[0024] Figure 1 Structure diagram of a drilling tool vibration energy recovery power generation device 100 according to the present application is schematically shown. Figure 2 Structure diagram of an inner cylinder 30 in the drilling tool vibration energy recovery power generation device 100. As shown in Figure 1 and Figure 2 , according to the first aspect of the present application, the drilling tool vibration energy recovery power generation device 100 comprises a first connector 10, a second connector 20, and an inner cylinder 30. The first connector 10 is provided with threads on the outer periphery thereof, so as to be threadedly connected with the upstream part of the drilling tool. The inner cylinder 30 is provided with threads on the outer periphery thereof, so as to be threadedly connected with the first connector 10. In addition, the first connector 10 is configured in a circular truncated cone structure and is internally provided with a flow passage having the same diameter as the inner cylinder 30. In this way, the fluid flowing out of the first connector 10 is effectively prevented from eroding and damaging the structure of the inner cylinder 30. The second connector 20 is provided with threads on the outer periphery thereof, so as to be threadedly connected with the downstream part of the drilling tool. The inner cylinder 30 is provided with threads on the outer periphery thereof, so as to be threadedly connected with the second connector 20. The second connector 20 is configured in a circular cylindrical structure with gradually changing diameter and is internally provided with a flow passage having the same diameter as the inner cylinder 30. In this way, the fluid flowing out of the inner cylinder 30 is effectively prevented from forming vortex flow in the second connector 20.

[0025] According to the present application, as shown in Figure 1As shown, the drill string vibration energy recovery power generation device 100 further comprises a piezoelectric unit 40, a buffer protection unit 50, and an outer cylinder 80. The outer cylinder 80 is sleeved on the outer periphery of the piezoelectric unit 40 and the buffer protection unit 50. The piezoelectric unit 40 is sleeved on the outer periphery of the inner cylinder 30 and close to one side of the first connecting head 10. The buffer protection unit 50 is sleeved on the outer periphery of the inner cylinder 30 and close to one side of the second connecting head 20. In addition, the piezoelectric unit 40 and the buffer protection unit 50 abut each other. According to the present application, the buffer protection unit 50 can reciprocate on the inner cylinder 30 along the axial direction in response to the vibration of the drill string, thereby driving the piezoelectric unit 40 to generate piezoelectric effect and output electric current.

[0026] According to the present application, the buffer protection unit 50 comprises a cylinder sleeve 51. Figure 5 is a sectional view of the cylinder sleeve 51 in the drill string vibration energy recovery power generation device 100. As shown, Figure 5 The cylinder sleeve 51 comprises an inner ring body 52 and an outer ring body 53 which are spaced apart from each other and connected at the bottom, and defines an annular space 54 between the inner ring body 52 and the outer ring body 53, in which the annular space 54 is filled with a magneto-rheological fluid (not shown in the figure). The magneto-rheological fluid is a suspension of small soft magnetic particles with high magnetic permeability and low magnetic hysteresis and a non-magnetic liquid, which exhibits Newtonian fluid characteristics with low viscosity and high flowability under zero magnetic field conditions, and exhibits Bingham body characteristics with high viscosity and low flowability under strong magnetic field conditions. The magneto-rheological fluid and its properties are well known to those skilled in the art. In this context, the magneto-rheological fluid comprises a first change state and a second change state. In the first change state, the magneto-rheological fluid changes to a state with high viscosity and low flowability. In the second change state, the magneto-rheological fluid changes to a state with low viscosity and high flowability.

[0027] Figure 3 is a sectional view of the buffer protection unit 50 in the drill string vibration energy recovery power generation device 100. According to the present application, the buffer protection unit 50 further comprises a piston rod 60 and a cylinder sleeve cover 55. As shown, Figure 3 The piston rod 60 is arranged in the annular space 54 and can reciprocate in the annular space 54. Its function will be described in detail below. As shown, Figure 6 In one embodiment as shown, the top end of the cylinder sleeve cover 55 is provided with threads, thereby forming a threaded connection with the cylinder sleeve 51, and closing the opening of the top of the annular space 54. In this way, the inside of the cylinder sleeve 51 constitutes a sealed space, thereby limiting the flow space of the magneto-rheological fluid and preventing leakage.

[0028] In one embodiment of the present application, as shown, Figure 3As shown, the piston rod 60 is configured as a stepped sleeve, and includes a main body portion 61 with a smaller diameter and located upstream, and an end step 62 with a larger diameter and located downstream. The inner wall of the main body portion 61 is in abutment with the outer wall of the inner annular body 52 of the cylinder liner 51, and the outer wall of the end step 62 is in abutment with the inner wall of the outer annular body 53, thereby separating the annular space 54 into a first annular space 541 located upstream and a second annular space 542 located downstream.

[0029] According to the present application, as Figure 3 shown, a plurality of channels 543 are provided in the end step 62 of the piston rod 60, and the plurality of channels 543 are arranged on the same circumferential line. One end of the channel 543 is in communication with the first annular space 541, and the other end is in communication with the second annular space 542. In this way, when the piston rod 60 reciprocates in the annular space 54, the magnetorheological fluid in the first annular space 541 and the magnetorheological fluid in the second annular space 542 can flow into each other. In an embodiment of the present application, the channels 543 are arranged obliquely. Specifically, the openings of the top ends of the channels 543 are arranged close to the inner wall of the outer annular body 53 of the cylinder liner 51, and the openings of the bottom ends of the channels 543 are arranged close to the outer wall of the inner annular body 52 of the cylinder liner 51. In this way, the magnetorheological fluid flowing through the channels 543 can more easily flow into the first annular space 541 or the second annular space 542.

[0030] In an embodiment of the present application, as Figure 3 shown, the buffer protection unit 50 further includes a first spring 57. The first spring 57 is arranged in the second annular space 542 in the cylinder liner 51, and is in abutment with the bottom of the end step 62 of the piston rod 60, thereby providing sufficient support force for the reciprocating movement of the piston rod 60 in the annular space 54.

[0031] According to the present application, as Figure 3 shown, the buffer protection unit 50 further includes a permanent magnet 70 and a coil 56. The permanent magnet 70 is arranged in the annular space 54, and the outer wall of the permanent magnet 70 is in contact with the inner wall of the outer annular body 53 of the cylinder liner 51. In other words, the inner wall of the permanent magnet 70 forms the outer boundary of the annular space 54. The permanent magnet 70 can provide an excitation magnetic field, and act on the magnetorheological fluid through the excitation magnetic field, thereby changing the state of the magnetorheological fluid to cooperate with the first spring 57 to support the reciprocating movement of the piston rod 60 in the annular space 54. The coil 56 is wound around the outer periphery of the cylinder liner 51, and serves as a carrier to adjust the magnetic field of the permanent magnet 70. Its role will be described in detail below.

[0032] In one embodiment of the present invention, the outer wall of the end step 62 of the piston rod 60 is in contact with a portion of the inner wall of the permanent magnet 70, and the inner wall of the end step 62 of the piston rod 60 is in contact with the outer wall of the inner ring 52 of the cylinder liner 51. In this way, the piston rod 60 can reciprocate more smoothly and steadily within the annular space 54 between the inner ring 52 and the outer ring 53.

[0033] Figure 4 This is a schematic diagram of the piezoelectric unit 40 in the drill vibration energy recovery and power generation device 100. According to the present invention, as... Figure 4 As shown, the piezoelectric unit 40 includes a ceramic stack assembly 41 and a control assembly 42 connected to the ceramic stack assembly 41. The ceramic stack assembly 41 generates a compressive force in response to the vibration of the drill bit. Specifically, the piezoelectric unit 40 and the buffer unit 50 reciprocate together under their own inertia, causing a reciprocating compressive force between the piezoelectric ceramics in the ceramic stack assembly 41. Furthermore, during its reciprocating motion, the piezoelectric unit 40 contacts and compresses with the first connector 10 and the support platform 63, thereby loading and unloading the stress on the piezoelectric unit 40. In this way, the piezoelectric module 40 can effectively recover the vibration energy of the drill bit, thereby generating a piezoelectric effect and outputting current.

[0034] According to one embodiment of the present invention, the current generated by the piezoelectric unit 40 is shunt through the control assembly 42. A portion of the current is used to supply other downhole tools; the other portion is used to monitor and adjust the parameters of the buffer protection unit 50 in real time, thereby changing the state of the magnetorheological fluid to suit different frequency vibrations of the drill string.

[0035] In one embodiment of the present invention, the carrier comprises two parts. One part of the carrier consists of the coil 56 and the control assembly 42, used for magnetizing or demagnetizing the permanent magnet 70; the other part of the carrier consists of other downhole tools, such as distributed measurement devices. Their functions will be described in detail below.

[0036] According to one embodiment of the present invention, the control assembly 42 can generate a magnetic field in the same or opposite direction as the permanent magnet 70 via the coil 56, thereby superimposing it with the magnetic field of the permanent magnet 70 to form a composite magnetic field, thus achieving the function of magnetizing or demagnetizing the permanent magnet 70. The viscosity and fluidity of the magnetorheological fluid also change with the composite magnetic field. In this way, the drill vibration energy recovery power generation device 100 can more easily adjust and monitor the strength of the magnetic field of the buffer protection unit 50.

[0037] According to one embodiment of the present invention, when the control assembly 42 generates a magnetic field in the same direction as the permanent magnet 70 through the coil 56, the combined magnetic field strength of the coil 56 magnetic field and the permanent magnet 70 magnetic field is enhanced, and the magnetorheological fluid is in a first change state. That is, the magnetorheological fluid transforms into a state with higher viscosity and lower fluidity, resulting in greater stiffness of the combination of the magnetorheological fluid and the first spring 57, thereby providing greater support force to the piston rod 60. When the control assembly 42 generates a magnetic field in the opposite direction to the permanent magnet 70 through the coil 56, the combined magnetic field strength of the coil 56 magnetic field and the permanent magnet 70 magnetic field is reduced, and the magnetorheological fluid is in a second change state. That is, the magnetorheological fluid transforms into a state with lower viscosity and higher fluidity, resulting in less stiffness of the combination of the magnetorheological fluid and the first spring 57, thereby providing less support force to the piston rod 60. At this time, the piezoelectric module 40 will push the support platform 63 of the buffer protection unit 50 (described below) downward under the action of inertia and impact, thereby buffering the high acceleration impact borne by the piezoelectric module 40.

[0038] In such Figure 3 In one embodiment shown, the tip of the piston rod 60 extends outward from the opening of the annular space 54. According to the invention, as... Figure 3 As shown, the buffer protection unit 50 includes a support platform 63 and a second spring 64. The support platform 63 is fixedly connected to the top end of the piston rod 60, thereby limiting the axial movement range of the piston rod 60. The second spring 64 is sleeved on the outer periphery of the piston rod 60 and is located between the support platform 63 and the cylinder liner cover 55. The second spring 64 provides some support for the reciprocating motion of the piston rod 60 within the annular space 54. In one embodiment of the invention, the inner diameter of the support platform 63 is larger than the outer diameter of the inner cylinder 30, and the outer diameter of the support platform 63 is smaller than the inner diameter of the outer cylinder 80.

[0039] In one embodiment of the present invention, such as Figure 3 As shown, wear-resistant rings and sealing rings are provided on the inner wall of the support platform 63 (not shown), on the outer periphery of the end step 62 of the piston rod 60, and on the inner wall of the cylinder liner 51, so that each part of the drill vibration energy recovery power generation device 100 has good sealing and wear resistance.

[0040] This invention enables the effective recovery and reuse of drill string vibration energy, allowing the drill string vibration energy recovery and power generation device 100 to achieve energy recycling during operation. By converting drill string vibration energy into electrical energy, this invention effectively recovers and reuses the energy, thereby improving the energy utilization rate of the entire drilling system.

[0041] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present application, and such changes or modifications shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A drilling tool vibration energy recovery power generation device (100), comprising: a first connecting head (10) for connecting with an upstream part of a drilling tool, a second connecting head (20) for connecting with a downstream part of the drilling tool, an inner cylinder (30) connected between the first connecting head (10) and the second connecting head (20), a piezoelectric unit (40) and a buffer protection unit (50) sleeved on the inner cylinder (30) respectively, the piezoelectric unit (40) abuts against the buffer protection unit (50), and an outer cylinder (80) arranged on the outer periphery of the piezoelectric unit (40) and the buffer protection unit (50), wherein the buffer protection unit (50) is configured to reciprocate in an axial direction in response to vibration of the drilling tool, thereby driving the piezoelectric unit (40) to generate a piezoelectric effect and output an electric current, The buffer protection unit (50) comprises a cylinder sleeve (51) comprising an inner ring body (52) and an outer ring body (53) arranged apart from each other and connected at the bottom, defining an annular space (54) between the inner ring body (52) and the outer ring body (53), the annular space (54) being filled with a magneto-rheological fluid; a piston rod (60) arranged in the annular space (54); and a cylinder sleeve cover (55) fixedly connected with the cylinder sleeve (51) and closing the opening of the annular space (54), the piston rod (60) being configured as a stepped sleeve and comprising a main body portion (61) with a smaller diameter and an end step (62) with a larger diameter, wherein the inner wall of the main body portion (61) is fitted with the outer wall of the inner ring body (52) of the cylinder sleeve (51), and the outer wall of the end step (62) is fitted with the inner wall of the outer ring body (53), thereby dividing the annular space (54) into a first annular space (541) and a second annular space (542), a plurality of holes (543) arranged on the same circumferential line are arranged in the end step (62) for communicating the first annular space (541) and the second annular space (542), the buffer protection unit (50) comprises a permanent magnet (70) arranged in the annular space (54) and in contact with the outer ring body (53), and a coil (56) wound on the outer periphery of the cylinder sleeve (51), wherein the permanent magnet (70) can act on the magneto-rheological fluid through an excitation magnetic field, the piezoelectric unit (40) comprises a ceramic stack assembly (41) and a control assembly (42) in communication with the ceramic stack assembly (41), the control assembly (42) is electrically connected with the coil (56), wherein the ceramic stack assembly (41) can output current in response to vibration of the drilling tool for use by the load of the device, the load being the coil (56) and the control assembly (42), the control assembly (42) can generate a magnetic field through the coil (56) which is the same direction or opposite direction of the permanent magnet (70), thereby superimposing with the magnetic field of the permanent magnet (70) to form a composite magnetic field and magnetizing or demagnetizing the permanent magnet (70) respectively, thereby changing the state of the magneto-rheological fluid, the openings at the top of the holes (543) are arranged close to the inner wall of the outer ring body (53) of the cylinder sleeve (51), and the openings at the bottom of the holes (543) are arranged close to the outer wall of the inner ring body (52) of the cylinder sleeve (51).

2. The drill string vibration energy recovery power generation device of claim 1, wherein, The buffer protection unit (50) comprises a first spring (57) arranged in the second annular space (542) of the cylinder sleeve (51) for supporting the reciprocating movement of the piston rod (60) in the annular space (54).

3. The drill string vibration energy recovery power generation device of claim 2, wherein, The buffer protection unit (50) comprises a support table (63) fixedly connected with the top end of the piston rod (60), and a second spring (64) arranged between the support table (63) and the cylinder sleeve cover (55).

4. The drill string vibration energy recovery power generation device of claim 3, wherein, The support table (63) has an inner diameter greater than the outer diameter of the inner cylinder (30) and an outer diameter less than the inner diameter of the outer cylinder (80). The support table (63) has an inner diameter greater than the outer diameter of the inner cylinder (30) and an outer diameter less than the inner diameter of the outer cylinder (80).

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