Near-bit sound wave resistivity measuring tool

Abstract

The utility model discloses a near-bit sound wave resistivity measuring tool which comprises a fixed cylinder, a stepping motor is arranged in the fixed cylinder, a threaded screw rod is fixedly installed at the power output end of the stepping motor, the outer surface of the threaded screw rod is in threaded connection with a first movable frame, and a sound wave emitter is fixedly installed on the bottom face of the first movable frame. A second movable frame is fixedly installed on the inner wall of the fixed cylinder, the inner wall of the second movable frame is rotationally connected with the outer surface of the threaded lead screw, a sound wave receiver is fixedly installed on the bottom face of the second movable frame, a cylinder is fixedly installed on the inner wall of the fixed cylinder, and the outer surface of the cylinder is slidably connected with the inner walls of the first movable frame and the second movable frame. The threaded lead screw can be driven to rotate through power provided by the stepping motor, the first movable frame can drive the sound wave emitter to move, the first movable frame can be limited through the cylinder, and therefore the position of the emitter can be conveniently adjusted after the sound wave emitter enters a certain depth.

Description

Technical Field

[0001] The utility model relates to the technical field of near-bit acoustic resistivity measurement, in particular to a near-bit acoustic resistivity measurement tool. Background Technique

[0002] In recent years, with the rapid development of logging technology, various logging-while-drilling tools have emerged in an endless stream, and the measurement accuracy and detection depth have been continuously enhanced. On this basis, logging-while-drilling resistivity measurement has also been applied to a certain extent. In the petroleum drilling and logging industries, formation resistivity is mainly used to distinguish lithology, divide oil, gas and water layers, and conduct formation profile comparison, etc. Usually, if the pore formation is filled with oil and gas, the formation resistivity is high, and if it is filled with water, the formation resistivity is low.

[0003] After the existing measurement device enters a certain depth along with the drill pipe of the drill bit, it is inconvenient to adjust the position of the transmitter, so that the position of the transmitter is fixed. Therefore, when the drill bit enters the same depth underground, it is inconvenient to detect and measure geological data in different depth ranges, resulting in low practicability. Therefore, the technical personnel in this field provide a near-bit acoustic resistivity measurement tool to solve the problems raised in the above background technique. Content of the Utility Model

[0004] In view of this, it is necessary to provide a near-bit acoustic resistivity measurement tool to solve the problem that after the measurement device enters a certain depth along with the drill pipe of the drill bit, it is inconvenient to adjust the position of the transmitter, so that the position of the transmitter is fixed. Therefore, when the drill bit enters the same depth underground, it is inconvenient to detect and measure geological data in different depth ranges, resulting in low practicability.

[0005] According to one aspect of the utility model, a near-bit acoustic resistivity measurement tool is provided, including: a fixed cylinder, a stepping motor is arranged inside the fixed cylinder, a threaded lead screw is fixedly installed at the output end of the power of the stepping motor, a first movable frame is threadedly connected to the outer surface of the threaded lead screw, an acoustic transmitter is fixedly installed on the bottom surface of the first movable frame, a second movable frame is fixedly installed on the inner wall of the fixed cylinder, the inner wall of the second movable frame is rotatably connected to the outer surface of the threaded lead screw, an acoustic receiver is fixedly installed on the bottom surface of the second movable frame, a cylinder is fixedly installed on the inner wall of the fixed cylinder, and the outer surface of the cylinder is slidably connected to the inner walls of the first movable frame and the second movable frame.

[0006] According to some embodiments, a connecting cylinder is fixedly installed on the left side surface of the fixed cylinder, and the right side surface of the connecting cylinder is fixedly connected to the left side surface of the cylinder.

[0007] According to some embodiments, a drill bit body is fixedly installed on the left side surface of the connecting cylinder, and equally spaced cutting teeth are fixedly installed on the outer surface of the drill bit body.

[0008] According to some embodiments, a support block is fixedly installed on the inner wall of the fixed cylinder, and the bottom surface of the support block is fixedly connected to the upper surface of the stepping motor.

[0009] According to some embodiments, four fixing bolts are arranged below the support block. The top end of each fixing bolt penetrates through the stepping motor and extends into the support block, and each fixing bolt is threadedly connected to the support block.

[0010] According to some embodiments, a support cylinder is fixedly installed at the right end of the fixed cylinder, and a conveying hole is formed in the right side surface of the support cylinder.

[0011] According to some embodiments, a bearing is fixedly installed at the left end of the threaded lead screw, and the left side surface of the bearing is fixedly connected to the inner side wall of the fixed cylinder.

[0012] According to some embodiments, a conical reinforcement block is fixedly installed on the outer surface of the connecting cylinder, and the right side surface of the conical reinforcement block is fixedly connected to the left side surface of the fixed cylinder.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] By providing an acoustic wave transmitter, acoustic waves can be emitted in the well, enabling the acoustic wave receiver to receive the emitted acoustic waves, thereby enabling the measurement of resistivity. The power provided by the stepping motor can drive the threaded lead screw to rotate, enabling the first movable frame to drive the acoustic wave transmitter to move. The cylinder can limit the first movable frame to prevent the acoustic wave transmitter from rotating during movement. Thus, after reaching a certain depth, it is convenient to adjust the position of the transmitter, enabling the position of the transmitter to be changed. Therefore, when entering the same depth underground, it is convenient to detect and measure geological data in different depth ranges, achieving a strong practical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the fixed cylinder of a near-bit acoustic wave resistivity measurement tool provided by the present utility model;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the threaded lead screw of a near-bit acoustic wave resistivity measurement tool provided by the present utility model;

[0018] Figure 3 Schematic diagram of the right view of the bearing of a near-bit acoustic resistivity measurement tool provided by the present utility model;

[0019] Figure 4 Schematic diagram of the bottom view of the stepping motor of a near-bit acoustic resistivity measurement tool provided by the present utility model.

[0020] In the figure: 1. Fixed cylinder; 2. Stepping motor; 3. Threaded lead screw; 4. Second movable frame; 5. Acoustic wave receiver; 6. First movable frame; 7. Acoustic wave transmitter; 8. Cylinder; 9. Connecting cylinder; 10. Conical reinforcement block; 11. Drill bit body; 12. Cutting teeth; 13. Support block; 14. Fixed bolt; 15. Support cylinder; 16. Delivery hole; 17. Bearing. Specific embodiments

[0021] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] Please refer to Figures 1 to 4 , the present utility model provides a near-bit acoustic resistivity measurement tool, including a fixed cylinder 1. A stepping motor 2 is arranged inside the fixed cylinder 1. A threaded lead screw 3 is fixedly installed at the power output end of the stepping motor 2. A first movable frame 6 is threadedly connected to the outer surface of the threaded lead screw 3. An acoustic wave transmitter 7 is fixedly installed on the bottom surface of the first movable frame 6. A second movable frame 4 is fixedly installed on the inner wall of the fixed cylinder 1. The inner wall of the second movable frame 4 is rotatably connected to the outer surface of the threaded lead screw 3. An acoustic wave receiver 5 is fixedly installed on the bottom surface of the second movable frame 4. A cylinder 8 is fixedly installed on the inner wall of the fixed cylinder 1. The outer surface of the cylinder 8 is slidably connected to the inner walls of the first movable frame 6 and the second movable frame 4.

[0023] The acoustic wave transmitter 7 can emit acoustic waves in the well, so that the acoustic wave receiver 5 can receive the emitted acoustic waves, thereby enabling the measurement of the resistivity. The power provided by the stepping motor 2 can drive the threaded lead screw 3 to rotate, so that the first movable frame 6 can drive the acoustic wave transmitter 7 to move. The cylinder 8 can limit the first movable frame 6 to prevent the acoustic wave transmitter 7 from rotating during movement. Thus, after entering a certain depth, it is convenient to adjust the position of the transmitter, so that the position of the transmitter can be changed. Therefore, when entering the same depth underground, it is convenient to detect and measure the geological data in different depth ranges.

[0024] Furthermore, a connecting cylinder 9 is fixedly installed on the left side surface of the fixed cylinder 1. The right side surface of the connecting cylinder 9 is fixedly connected to the left side surface of the cylindrical barrel 8. Through the connecting cylinder 9, drilling fluid can be conveyed, thus facilitating drilling and increasing the convenience of the device.

[0025] Furthermore, a drill bit body 11 is fixedly installed on the left side surface of the connecting cylinder 9. Equally-spaced cutting teeth 12 are fixedly installed on the outer surface of the drill bit body 11. Through the cutting teeth 12, drilling can be facilitated, thus facilitating the entry of the drill bit body 11 and increasing the convenience of drilling.

[0026] Furthermore, a support block 13 is fixedly installed on the inner wall of the fixed cylinder 1. The bottom surface of the support block 13 is fixedly connected to the upper surface of the stepping motor 2. Through the support block 13, the stepping motor 2 can be limited and supported, thus preventing the stepping motor 2 from falling and increasing the stability of the stepping motor 2.

[0027] Furthermore, four fixing bolts 14 are arranged below the support block 13. The top end of each fixing bolt 14 penetrates through the stepping motor 2 and extends into the interior of the support block 13. Each fixing bolt 14 is threadedly connected to the support block 13. Through the fixing bolts 14, the stability degree of the stepping motor 2 can be increased, thus preventing the stepping motor 2 from shaking during operation and increasing the firmness of the stepping motor 2.

[0028] Furthermore, a support cylinder 15 is fixedly installed at the right end of the fixed cylinder 1. A conveying hole 16 is formed on the right side surface of the support cylinder 15. Through the conveying hole 16, drilling fluid can be directly conveyed into the cylindrical barrel 8, thus facilitating the drilling work and increasing the practicality of the device.

[0029] Furthermore, a bearing 17 is fixedly installed at the left end of the threaded lead screw 3. The left side surface of the bearing 17 is fixedly connected to the inner side wall of the fixed cylinder 1. Through the bearing 17, the threaded lead screw 3 can be limited and supported, thus preventing the threaded lead screw 3 from shifting during rotation and increasing the stability of the threaded lead screw 3.

[0030] Furthermore, a conical reinforcement block 10 is fixedly installed on the outer surface of the connecting cylinder 9. The right side surface of the conical reinforcement block 10 is fixedly connected to the left side surface of the fixed cylinder 1. Through the conical reinforcement block 10, the connection stability between the connecting cylinder 9 and the fixed cylinder 1 can be increased, preventing the connecting cylinder 9 from falling and increasing the firmness of the connection of the connecting cylinder 9.

[0031] Working principle: During use, first connect the stepping motor 2, the acoustic wave receiver 5, and the acoustic wave transmitter 7 to the power supply. When resistivity measurement is required, the cutting teeth 12 can facilitate the drilling of the drill bit body 11. The conveying hole 16 can directly convey the drilling fluid into the cylinder 8, enabling the drilling fluid to enter the drill bit body 11 through the connecting cylinder 9, thus facilitating the drilling work and allowing the fixed cylinder 1 to enter the well. The acoustic wave transmitter 7 can emit acoustic waves in the well, enabling the acoustic waves to be effectively transmitted into the rock medium. The acoustic wave receiver 5 can receive the emitted acoustic waves, thereby enabling the measurement of resistivity. The power provided by the stepping motor 2 can drive the threaded lead screw 3 to rotate. The bearing 17 can limit and support the threaded lead screw 3, thereby preventing the threaded lead screw 3 from shifting during rotation, enabling the first movable frame 6 to drive the acoustic wave transmitter 7 to move. The cylinder 8 can limit the first movable frame 6 to prevent the acoustic wave transmitter 7 from rotating during movement. Thus, after reaching a certain depth, it is convenient to adjust the position of the transmitter, enabling the position of the transmitter to be changed. Therefore, when entering the same depth underground, it is convenient to detect and measure the geological data in different depth ranges, making the near-bit acoustic wave resistivity measurement tool more practical.

[0032] In the attached drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This 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. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

Claims

1. A near-bit acoustic resistivity measurement tool, characterized in that, It includes a fixed cylinder (1), inside which a stepping motor (2) is provided. The output end of the power of the stepping motor (2) is fixedly installed with a threaded lead screw (3). A first movable frame (6) is threadedly connected to the outer surface of the threaded lead screw (3). A sound wave transmitter (7) is fixedly installed on the bottom surface of the first movable frame (6). A second movable frame (4) is fixedly installed on the inner wall of the fixed cylinder (1). The inner wall of the second movable frame (4) is rotatably connected to the outer surface of the threaded lead screw (3). A sound wave receiver (5) is fixedly installed on the bottom surface of the second movable frame (4). A cylinder (8) is fixedly installed on the inner wall of the fixed cylinder (1). The outer surface of the cylinder (8) is slidably connected to the inner walls of the first movable frame (6) and the second movable frame (4).

2. The near-bit acoustic resistivity measurement tool according to claim 1, wherein, A connecting cylinder (9) is fixedly installed on the left side surface of the fixed cylinder (1). The right side surface of the connecting cylinder (9) is fixedly connected to the left side surface of the cylinder (8).

3. The near-bit acoustic resistivity measurement tool according to claim 2, wherein A drill bit body (11) is fixedly installed on the left side surface of the connecting cylinder (9). Cutting teeth (12) arranged at equal intervals are fixedly installed on the outer surface of the drill bit body (11).

4. The near-bit acoustic resistivity measurement tool according to claim 1, characterized in that, A support block (13) is fixedly installed on the inner wall of the fixed cylinder (1). The bottom surface of the support block (13) is fixedly connected to the upper surface of the stepping motor (2).

5. A near-bit acoustic resistivity measurement tool according to claim 4, characterized in that, Four fixing bolts (14) are arranged below the support block (13). The top end of each fixing bolt (14) penetrates through the stepping motor (2) and extends into the inside of the support block (13). Each fixing bolt (14) is threadedly connected to the support block (13).

6. The near-bit acoustic resistivity measurement tool according to claim 1, characterized in that, A support cylinder (15) is fixedly installed at the right end of the fixed cylinder (1). A conveying hole (16) is opened on the right side surface of the support cylinder (15).

7. A near-bit acoustic resistivity measurement tool according to claim 1, characterized in that, A bearing (17) is fixedly installed at the left end of the threaded lead screw (3). The left side surface of the bearing (17) is fixedly connected to the inner side wall of the fixed cylinder (1).

8. A near-bit acoustic resistivity measurement tool according to claim 2, characterized in that, A conical reinforcement block (10) is fixedly installed on the outer surface of the connecting cylinder (9). The right side surface of the conical reinforcement block (10) is fixedly connected to the left side surface of the fixed cylinder (1).

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