A downhole vibration signal communication tool

Abstract

The present invention discloses a downhole vibration signal communication tool, which belongs to the technical field of oil production. The downhole vibration signal communication tool includes a battery compartment, a control compartment, and a drive compartment. A battery module is arranged in the battery compartment; the control compartment is coaxially connected to the battery compartment, and a control circuit board is arranged in the control compartment; the drive compartment is coaxially connected to one end of the control compartment away from the battery compartment, and a drive coil is arranged in the drive compartment along the axial direction of the drive compartment. The battery module supplies power to the drive coil via the control circuit board. A magnetostrictive rod is arranged in the drive coil along the axial direction of the drive coil, and a weight is arranged at one end of the magnetostrictive rod away from the control compartment; the magnetostrictive rod can reciprocate along its own axis to impact the weight and drive the weight to vibrate to generate vibration waves, and the control circuit board can encode communication information and load the encoded communication information on the vibration waves. The present invention can stably realize the data transmission of communication information from downhole to the ground, and has a low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production, and particularly to a downhole vibration signal communication tool. Background Art

[0002] Two-way communication between the ground and the downhole is one of the key technologies for realizing reservoir digitalization and improving development effects.

[0003] In the prior art, the commonly used downhole data transmission method is pipeline control transmission.

[0004] However, the construction of pipeline control transmission is relatively complex, with high risks and costs. Due to the large number of series system joints required, its reliability is poor.

[0005] Therefore, there is an urgent need for a downhole vibration signal communication tool to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a downhole vibration signal communication tool to solve the technical problems of high risks, high costs, and poor reliability in downhole data transmission in the prior art.

[0007] As such conceived, the technical solution adopted by the present invention is as follows:

[0008] A downhole vibration signal communication tool, comprising:

[0009] A battery compartment, in which a battery module is arranged;

[0010] A control compartment, coaxially connected to the battery compartment, and a control circuit board is arranged in the control compartment;

[0011] A drive compartment, coaxially connected to one end of the control compartment away from the battery compartment. Along the axial direction of the drive compartment, a drive coil is arranged in the drive compartment. The battery module supplies power to the drive coil via the control circuit board. Along the axial direction of the drive coil, a magnetostrictive rod is arranged in the drive coil. A weight is arranged at one end of the magnetostrictive rod away from the control compartment;

[0012] The downhole vibration signal communication tool is configured to: the control circuit board converts the direct current output by the battery module into alternating current, and makes the drive coil generate an alternating magnetic field, driving the magnetostrictive rod to reciprocate along its own axis direction to strike the weight and drive the weight to vibrate to generate vibration waves. The control circuit board can encode communication information and load the encoded communication information on the vibration waves.

[0013] Optionally, a coil bobbin is arranged in the driving chamber. The coil bobbin has a hollow structure to accommodate the magnetostrictive rod, and a wire is wound around the coil bobbin to form the driving coil.

[0014] Optionally, inside the driving chamber, a bias magnetic sleeve is arranged outside the coil bobbin to generate a bias magnetic field and ensure that the magnetostrictive rod operates in the linear region.

[0015] Optionally, a magnetostrictive rod lower pressing head is arranged at one end of the magnetostrictive rod close to the weight, and the magnetostrictive rod lower pressing head abuts against the weight.

[0016] A first joint is connected between the control chamber and the driving chamber. A magnetostrictive rod upper pressing head is arranged at one end of the magnetostrictive rod close to the first joint, and the magnetostrictive rod upper pressing head abuts against the first joint.

[0017] Optionally, the coil bobbin includes:

[0018] A bobbin main body, which has a hollow structure to accommodate the magnetostrictive rod, and a wire is wound around the bobbin main body to form the driving coil.

[0019] Bobbin supports, with one bobbin support arranged at each end of the bobbin main body.

[0020] Optionally, one bobbin support abuts against the magnetostrictive rod lower pressing head, and the other bobbin support abuts against the magnetostrictive rod upper pressing head. A first through hole is arranged on the bobbin support that abuts against the magnetostrictive rod upper pressing head. A second through hole coaxial with the first through hole is arranged on the magnetostrictive rod upper pressing head. A blind hole is arranged on the end face of the first joint facing the magnetostrictive rod upper pressing head. A limit pin sequentially passes through the first through hole, the second through hole and enters the blind hole.

[0021] Optionally, a coil bobbin tightening disc is further arranged in the driving chamber. The magnetostrictive rod lower pressing head passes through the coil bobbin tightening disc and abuts against the weight. A retaining ring is clamped between the coil bobbin tightening disc and the weight, and a retaining ring groove matching with the retaining ring is arranged on the inner wall of the driving chamber.

[0022] Optionally, a lower joint is arranged at the opening at one end of the driving chamber away from the control chamber. An elastic member is arranged between the end face of the lower joint and the weight inside the driving chamber.

[0023] Optionally, a pre-tightening force adjusting gasket is further arranged between the elastic member and the end face of the lower joint.

[0024] Optionally, the axial dimension of the magnetostrictive rod is smaller than the axial dimension of the driving coil.

[0025] When the downhole vibration signal communication tool proposed by the present invention is in use, it is buried downhole. It has simple operation and low cost. It uses the battery module arranged in the battery compartment as the downhole power supply. The control circuit board converts the direct current output by the battery module into alternating current, drives the coil to generate an alternating magnetic field, makes the magnetostrictive rod expand and contract, and drives the weight to generate vibration. The control circuit board encodes the communication information and loads the encoded communication information on the vibration wave, so that the communication information uses the vibration wave as the carrier to realize data transmission from downhole to the ground, and the reliability of data transmission is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0027] Figure 1 is the overall structural schematic diagram of the downhole vibration signal communication tool provided by the embodiment of the present invention;

[0028] Figure 2 is the cross-sectional view of the downhole vibration signal communication tool provided by the embodiment of the present invention;

[0029] Figure 3 is the cross-sectional structural schematic diagram of the control compartment provided by the embodiment of the present invention;

[0030] Figure 4 is the cross-sectional structural schematic diagram of the drive compartment provided by the embodiment of the present invention;

[0031] Figure 5 is Figure 4 the enlarged view of a part of the structure in;

[0032] Figure 6 is Figure 4 the enlarged view of another part of the structure in;

[0033] Figure 7 is the exploded schematic diagram of some structures in the drive compartment provided by the embodiment of the present invention;

[0034] Figure 8 is Figure 7 the enlarged view of some structures in.

[0035] In the figure:

[0036] 1. Battery compartment; 11. Battery; 12. Battery compartment cover; 13. Battery connector; 14. Battery connector base;

[0037] 2. Control bin; 21. Control circuit board; 22. Circuit board bracket; 221. Middle cross plate; 222. First end plate; 223. Second end plate;

[0038] 3. Drive bin; 31. Drive coil; 32. Magnetostrictive rod; 321. Magnetostrictive rod lower press head; 322. Magnetostrictive rod upper press head; 33. Weight; 331. Elastic member; 332. Pre-tightening force adjustment gasket; 34. Coil skeleton; 341. Skeleton main body; 342. Skeleton support; 3421. First through hole; 343. Coil skeleton tightening disk; 344. Retaining ring; 35. Biasing magnetic sleeve; 37. Limit pin;

[0039] 4. First joint; 41. Blind hole;

[0040] 5. Lower joint;

[0041] 6. Second joint;

[0042] 7. Injection well joint. Detailed implementation manner

[0043] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all of them.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] See Figures 1-8 , this embodiment provides a downhole vibration signal communication tool, which includes a battery compartment 1, a control compartment 2 and a drive compartment 3.

[0047] Among them, a battery module is arranged in the battery compartment 1.

[0048] The control compartment 2 is coaxially connected to the battery compartment 1, and a control circuit board 21 is arranged in the control compartment 2.

[0049] The drive compartment 3 is coaxially connected to one end of the control compartment 2 away from the battery compartment 1. Along the axial direction of the drive compartment 3, a drive coil 31 is arranged in the drive compartment 3. The battery module supplies power to the drive coil 31 via the control circuit board 21. Along the axial direction of the drive coil 31, a magnetostrictive rod 32 is arranged in the drive coil 31. A weight 33 is arranged at one end of the magnetostrictive rod 32 away from the control compartment 2.

[0050] The downhole vibration signal communication tool is configured as follows: the control circuit board 21 converts the direct current output by the battery module into an alternating current, and makes the drive coil 31 generate an alternating magnetic field, driving the magnetostrictive rod 32 to reciprocate along its own axis direction to impact the weight 33 and drive the weight 33 to vibrate, thereby generating vibration waves. The control circuit board 21 can encode communication information and load the encoded communication information on the vibration waves, so as to realize the data transmission of communication information from downhole to the ground with the vibration waves as the carrier.

[0051] When the downhole vibration signal communication tool provided in this embodiment is in use, the downhole vibration signal communication tool is buried in the downhole, and the battery module arranged in the battery compartment 1 is used as the downhole power supply. The control circuit board 21 converts the direct current output by the battery module into an alternating current, and the drive coil 31 generates an alternating magnetic field, causing the magnetostrictive rod 32 to expand and contract and driving the weight 33 to vibrate. The control circuit board 21 encodes the communication information and loads the encoded signal on the vibration waves, so that the communication information realizes the data transmission of communication information from downhole to the ground with the vibration waves as the carrier.

[0052] Specifically, in this embodiment, the communication information includes control instructions and / or monitoring data. It should be noted that it is a very mature existing technology for the control circuit board 21 to encode communication information and load the encoded signal on the transmission medium, which will not be elaborated here.

[0053] Specifically, in this embodiment, multiple batteries 11 are arranged in the battery compartment 1. The multiple batteries 11 form a battery module to provide power for the downhole vibration signal communication tool. Specifically, the multiple batteries 11 are welded together by metal strips to form a battery module, and the positive and negative output poles of the battery module are connected to the battery connector 13. Specifically, a battery connector base 14 is arranged in the battery compartment 1, and the battery connector 13 is fixed on the battery connector base 14 by threaded connection.

[0054] Specifically, the battery module can supply power to the control circuit board 21.

[0055] Furthermore, a battery cover 12 is provided at one end of the battery compartment 1 away from the control compartment 2. The battery cover 12 is threadedly connected to the battery compartment 1 and a sealing rubber ring is provided between them to achieve downhole sealing.

[0056] Furthermore, in this embodiment, the battery compartment 1 and the control compartment 2 are connected by a second joint 6. Specifically, external threads are provided at both ends of the second joint 6, and the two ends of the second joint 6 are respectively threadedly connected inside the battery compartment 1 and the control compartment 2. Preferably, a sealing rubber ring is provided between the second joint 6 and the battery compartment 1 to achieve downhole sealing, and a sealing rubber ring is provided between the second joint 6 and the control compartment 2 to achieve downhole sealing.

[0057] Furthermore, the second joint 6 is of a hollow structure so that the wire led out from the battery joint 13 can pass through the second joint 6 and enter the control compartment 2 to be electrically connected to the control circuit board 21.

[0058] See Figure 3 , specifically, a circuit board bracket 22 is further provided inside the control compartment 2, and the control circuit board 21 is fixed on the circuit board bracket 22.

[0059] Specifically, the circuit board bracket 22 includes a middle cross plate 221. First end plates 222 and second end plates 223 are respectively provided at both ends of the middle cross plate 221. The cross sections of the first end plates 222 and the second end plates 223 are both circular and adapted to the transverse plane of the control compartment 2. The middle cross plate 221 is eccentrically arranged relative to the first end plates 222 and the second end plates 223, and through hole structures are provided on both the first end plates 222 and the second end plates 223 to facilitate the passage of wires.

[0060] Furthermore, the middle cross plate 221 is fixed inside the control compartment 2 by threaded parts. The control circuit board 21 is installed on one side of the middle cross plate 221. Optionally, an auxiliary control circuit board can also be installed on the other side of the middle cross plate 221 to further expand the functions of the downhole vibration signal communication tool through the auxiliary control circuit board.

[0061] Preferably, in this embodiment, the axial dimension of the magnetostrictive rod 32 is smaller than the axial dimension of the drive coil 31 to ensure that the magnetic field generated by the drive coil 31 completely covers the magnetostrictive rod 32.

[0062] Preferably, the weight 33 is made of a metal material with a relatively large density, such as cemented carbide.

[0063] Specifically, see Figures 4-8, in this embodiment, a coil bobbin 34 is disposed in the drive chamber 3. The coil bobbin 34 has a hollow structure to accommodate the magnetostrictive rod 32, and a wire is wound around the coil bobbin 34 to form a drive coil 31. Specifically, a wire with an insulating layer on the outside is wound around the coil bobbin 34 to form the drive coil 31.

[0064] The material of the coil bobbin 34 is a non-metallic material.

[0065] Further, inside the drive chamber 3, a bias magnetic sleeve 35 is disposed outside the coil bobbin 34 to generate a bias magnetic field and ensure that the magnetostrictive rod 32 operates in the linear region. Specifically, the bias magnetic sleeve 35 is made of a permanent magnet material.

[0066] Further, to ensure that the magnetostrictive rod 32 can stably strike the weight 33 to generate vibration, in this embodiment, a magnetostrictive rod lower pressing head 321 is disposed at one end of the magnetostrictive rod 32 close to the weight 33, and the magnetostrictive rod lower pressing head 321 abuts against the weight 33; a first joint 4 is connected between the control chamber 2 and the drive chamber 3, and a magnetostrictive rod upper pressing head 322 is disposed at one end of the magnetostrictive rod 32 close to the first joint 4, and the magnetostrictive rod upper pressing head 322 abuts against the first joint 4.

[0067] Specifically, external threads are disposed at both ends of the first joint 4, and the two ends of the first joint 4 are respectively threadedly connected inside the control chamber 2 and the drive chamber 3. Preferably, a sealing rubber ring is disposed between the inner wall of the first joint 4 and the control chamber 2, and a sealing rubber ring is disposed between the inner wall of the first joint 4 and the drive chamber 3 to achieve downhole sealing.

[0068] Preferably, a threaded shaft protrudes along the axial direction on the first end plate 222, and an internal threaded hole matching the threaded shaft is disposed on the end face of the end of the first joint 4 extending into the control chamber 2. With such a setting, the stability of the installation of the circuit board support 22 can be further ensured.

[0069] Further, referring to Figure 7 and Figure 8 , in this embodiment, the coil bobbin 34 includes a bobbin main body 341 and a bobbin support 342.

[0070] The bobbin main body 341 has a hollow structure to accommodate the magnetostrictive rod 32, and a wire is wound around the bobbin main body 341 to form the drive coil 31; a bobbin support 342 is disposed at each end of the bobbin main body 341.

[0071] Further, in order to radially limit the coil bobbin 34, in this embodiment, one bobbin support 342 abuts against the magnetostrictive rod lower press head 321, and the other bobbin support 342 abuts against the magnetostrictive rod upper press head 322. A first through hole 3421 is provided on the bobbin support 342 that abuts against the magnetostrictive rod upper press head 322, and a second through hole coaxial with the first through hole 3421 is provided on the magnetostrictive rod upper press head 322. A blind hole 41 is provided on the end face of the first joint 4 facing the magnetostrictive rod upper press head 322. The limit pin 37 sequentially passes through the first through hole 3421, the second through hole and enters the blind hole 41. The radial limit of the coil bobbin 34 is achieved through the limit pin 37.

[0072] Further, in order to axially limit the coil bobbin 34, in this embodiment, a coil bobbin tightening disc 343 is further provided in the drive chamber 3. The magnetostrictive rod lower press head 321 passes through the coil bobbin tightening disc 343 and abuts against the weight 33. A retaining ring 344 is clamped between the coil bobbin tightening disc 343 and the weight 33, and a retaining ring groove cooperating with the retaining ring 344 is provided on the inner wall of the drive chamber 3.

[0073] Through the axial limit and radial limit of the coil bobbin 34, when transmitting the vibration wave, the weight 33 and the magnetostrictive rod 32 vibrate, while the coil bobbin 34 can remain fixed, so that the position of the alternating magnetic field will not shift.

[0074] Further, in this embodiment, a lower joint 5 is provided at the opening of the end of the drive chamber 3 away from the control chamber 2. An elastic member 331 is provided between the end face of the lower joint 5 and the weight 33 in the drive chamber 3. The weight 33 is pre-tightened through the elastic member 331. Optionally, the elastic member 331 is a disc spring in a compressed state.

[0075] Further, a pre-tightening force adjusting gasket 332 is further provided between the elastic member 331 and the end face of the lower joint 5. By adjusting the number and thickness of the pre-tightening force adjusting gaskets 332, the pre-tightening force on the weight 33 can be adjusted.

[0076] Further, for a water well that cannot be powered on the ground, a water injection well joint 7 can be installed at the lower end of the lower joint 5. The lower end of the water injection well joint 7 is provided with an external thread and can be connected to the wellhead of the water well; the upper end is connected to the lower joint 5, so as to provide a vibration signal generating source for the water well that cannot be powered.

[0077] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An underground vibration signal communication tool, characterized in that Comprising: A battery compartment (1) with a battery module disposed therein; A control compartment (2) coaxially connected to the battery compartment (1), and a control circuit board (21) is disposed in the control compartment (2); A drive compartment (3) coaxially connected to one end of the control compartment (2) away from the battery compartment (1). A drive coil (31) is disposed in the drive compartment (3) along the axial direction of the drive compartment (3). The battery module supplies power to the drive coil (31) via the control circuit board (21). A magnetostrictive rod (32) is disposed in the drive coil (31) along the axial direction of the drive coil (31). A weight (33) is disposed at one end of the magnetostrictive rod (32) away from the control compartment (2); The downhole vibration signal communication tool is configured such that: the control circuit board (21) converts the direct current output by the battery module into an alternating current, and causes the drive coil (31) to generate an alternating magnetic field, driving the magnetostrictive rod (32) to reciprocate along its own axis to strike the weight (33) and drive the weight (33) to vibrate to generate vibration waves. The control circuit board (21) can encode communication information and load the encoded communication information on the vibration waves; A coil bobbin (34) is disposed in the drive compartment (3). The coil bobbin (34) has a hollow structure to accommodate the magnetostrictive rod (32), and a wire is wound around the coil bobbin (34) to form the drive coil (31); Inside the drive compartment (3), a bias magnetic sleeve (35) is disposed outside the coil bobbin (34) to generate a bias magnetic field and ensure that the magnetostrictive rod (32) operates in the linear region; A magnetostrictive rod lower pressing head (321) is disposed at one end of the magnetostrictive rod (32) close to the weight (33), and the magnetostrictive rod lower pressing head (321) abuts against the weight (33); A first joint (4) is connected between the control compartment (2) and the drive compartment (3). A magnetostrictive rod upper pressing head (322) is disposed at one end of the magnetostrictive rod (32) close to the first joint (4), and the magnetostrictive rod upper pressing head (322) abuts against the first joint (4); A lower joint (5) is disposed at the opening at one end of the drive compartment (3) away from the control compartment (2). Inside the drive compartment (3), an elastic member (331) is disposed between the end face of the lower joint (5) and the weight (33).

2. The downhole vibration signal communication tool according to claim 1, wherein The coil bobbin (34) includes: A bobbin main body (341) having a hollow structure to accommodate the magnetostrictive rod (32), and a wire is wound around the bobbin main body (341) to form the drive coil (31); Bobbin supports (342), and one bobbin support (342) is disposed at each end of the bobbin main body (341).

3. The downhole vibration signal communication tool according to claim 2, characterized in that, One of the skeleton supports (342) abuts against the magnetostrictive rod lower pressing head (321), and the other skeleton support (342) abuts against the magnetostrictive rod upper pressing head (322). A first through hole (3421) is provided on the skeleton support (342) that abuts against the magnetostrictive rod upper pressing head (322). A second through hole coaxial with the first through hole (3421) is provided on the magnetostrictive rod upper pressing head (322). A blind hole (41) is provided on the end face of the first joint (4) facing the magnetostrictive rod upper pressing head (322). The limit pin (37) sequentially passes through the first through hole (3421), the second through hole and enters the blind hole (41).

4. The downhole vibration signal communication tool according to claim 3, wherein, A coil skeleton tightening disc (343) is further provided in the drive chamber (3). The magnetostrictive rod lower pressing head (321) passes through the coil skeleton tightening disc (343) and abuts against the weight (33). A retaining ring (344) is clamped between the coil skeleton tightening disc (343) and the weight (33). A retaining ring groove for cooperating with the retaining ring (344) is provided on the inner wall of the drive chamber (3).

5. The downhole vibration signal communication tool according to claim 1, wherein, A pre-tightening force adjusting gasket (332) is further provided between the elastic member (331) and the end face of the lower joint (5).

6. The downhole vibration signal communication tool according to any one of claims 1-5, characterized in that The axial dimension of the magnetostrictive rod (32) is smaller than the axial dimension of the drive coil (31).

Images