Deep coal bed gas drilling geosteering device

Abstract

The utility model discloses a deep coal bed gas drilling geosteering device which is characterized in that a sampling groove is formed in the peripheral surface of a drill bit, a cavity is formed in the drill bit, a sampling head is arranged in the sampling groove, the rear end of the sampling head is connected with a mounting plate in the cavity through a sliding rod, and a reset spring is arranged on the sliding rod; the reset spring is positioned between the mounting plate and the inner wall of the cavity; a reset head is arranged on the side, close to the sampling head, of the mounting plate, a driving head is arranged on the side, away from the sampling head, of the mounting plate, a driving sliding block matched with the driving head is arranged in the cavity of the drill bit in an up-down sliding mode, and a reset sliding block matched with the reset head is arranged in the cavity of the drill bit in an up-down sliding mode. The deep coal bed gas drilling geosteering device is ingenious in design, and effectively solves the problems that a sampling head of an existing geosteering device is reset only through a reset spring, when the sampling head is clamped into a surrounding geological layer, the risk that the sampling head cannot be reset is prone to being generated when reset resistance is increased, and therefore follow-up sampling work is affected.

Description

Technical Field

[0001] The utility model relates to the field of energy exploitation, in particular to a geological steering device for deep coalbed methane drilling. Background Art

[0002] A large amount of coalbed methane is contained in deep formations, which is an extremely rich underground mineral resource. To extract coalbed methane from deep formations, it is necessary to perforate the sidewall of the wellbore to promote the formation and expansion of fractures in the deep formations, facilitating the subsequent extraction of coalbed methane. Subsequently, fracturing fluid needs to be injected into the wellbore to overcome the relatively high formation pressure in the deep formations. The fracturing fluid penetrates through the perforations and enters the deep formations, further expanding and extending the fractures, which is beneficial to the subsequent extraction of coalbed methane.

[0003] Implementing horizontal well drilling is an important technical means to improve the exposure rate of oil and gas layers and increase the production of a single well. With the rapid development of logging-while-drilling technology, it has been widely used in the drilling process of horizontal wells. The patent document with the application number 202220689476.0 discloses a geological steering device for coalbed methane drilling, including a drill bit. A cavity is provided inside the drill bit, and a moving block is slidably arranged inside the cavity. Multiple groups of grooves are provided on the sidewall of the drill bit, and a sampling head is slidably arranged inside each groove. The opposite ends of two sampling heads on the same side are fixedly connected with a T-shaped rod. The rod wall of each T-shaped rod is slidably connected with the bottom of the groove on the same side. The opposite ends of two T-shaped rods on the same side are fixedly connected with a pressing block. A return spring is jointly fixed between the sidewall of each T-shaped rod close to the sampling head on the same side and the cavity wall. The drill bit and the moving block are jointly connected with a cable mechanism. This application can take soil samples during the drilling process, ensure the effectiveness of sampling, can take samples of multiple groups of soil layers at one time, and has convenient operation and high stability. However, the sampling head of this device is only reset by the return spring, and when the sampling head gets stuck in the surrounding geological layer and the reset resistance increases, there is a risk of being unable to reset, thus affecting the subsequent sampling work. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a geological steering device for deep coalbed methane drilling, which solves the problem that the sampling head of the existing geological steering device is only reset by the return spring, and when the sampling head gets stuck in the surrounding geological layer and the reset resistance increases, there is a risk of being unable to reset, thus affecting the subsequent sampling work.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model relates to a geological steering device for deep coalbed methane drilling, which comprises a drill bit, a sampling head, a driving slider and a reset slider. A sampling groove is formed on the outer peripheral surface of the drill bit, and a cavity is arranged inside the drill bit. The sampling head is arranged in the sampling groove, and the rear end of the sampling head is connected with a mounting plate in the cavity through a sliding rod. A reset spring is arranged on the sliding rod, and the reset spring is located between the mounting plate and the inner wall of the cavity; A reset head is arranged on one side of the mounting plate close to the sampling head, and a driving head is arranged on the other side of the mounting plate far from the sampling head. A driving slider matched with the driving head is arranged in the cavity of the drill bit in a vertically slidable manner, and a reset slider matched with the reset head is arranged in the cavity of the drill bit in a vertically slidable manner.

[0007] Further, the driving head is an arc surface, and the driving slider is provided with a circular slider matched with the arc surface of the driving head.

[0008] Further, the reset head is an arc surface, and the reset slider is provided with a circular slider matched with the arc surface of the reset head.

[0009] Further, a first lead screw and a second lead screw are arranged in the cavity of the drill bit. The first lead screw is in threaded cooperation with the driving slider, and the second lead screw is in threaded cooperation with the reset slider.

[0010] Further, a fixing block is arranged at the top end of the drill bit, and a first motor and a second motor are arranged in the fixing block. The first motor drives the first lead screw through a bevel gear set, and the second motor drives the second lead screw through a bevel gear set.

[0011] Further, a first guiding block is arranged on the front end face of the driving slider, and a first guiding groove matched with the first guiding block is arranged on the inner wall of the drill bit; A second guiding block is arranged on the front end face of the reset slider, and a second guiding groove matched with the second guiding block is arranged on the inner wall of the drill bit.

[0012] Further, the number of the sampling heads is three, and they are evenly distributed at different heights of the drill bit.

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

[0014] The geological steering device for deep coalbed methane drilling of the present utility model is equipped with a reset spring and a reset slider for the sampling head. When the sampling head is working normally, the sampling head relies on the reset spring for reset. When the sampling head is stuck by the geological layer and cannot be reset by relying on the reset spring, the reset head can be squeezed through the reset slider to achieve the reset of the sampling head; the reset slider and the driving slider of the geological steering device for deep coalbed methane drilling of the present utility model are driven by a lead screw and limited by a guiding groove, and the movement process is more reliable; the reset slider and the driving slider of the geological steering device for deep coalbed methane drilling of the present utility model are respectively driven by independent lead screws, and the two can move independently, and the working form is more flexible. Generally speaking, the geological steering device for deep coalbed methane drilling of the present utility model is ingeniously designed, reasonably structured, and functionally practical, effectively solving the problem that the sampling head of the existing geological steering device only relies on the reset spring for reset, and it is easy to generate the risk of inability to reset when the sampling head is stuck in the surrounding geological layer and the reset resistance increases, thus affecting the subsequent sampling work. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present utility model will be further described below in conjunction with the drawings:

[0016] Figure 1 It is a front elevation sectional view of the geological steering device for deep coalbed methane drilling of the present utility model;

[0017] Figure 2 is Figure 1 the enlarged view at A in

[0018] Figure 3 It is a rear elevation sectional view of the geological steering device for deep coalbed methane drilling of the present utility model;

[0019] Figure 4 is Figure 3 the enlarged view at B in

[0020] Description of the reference numerals in the drawings: 1, drill bit; 2, fixing block; 3, sampling groove; 4, sampling head; 5, sliding rod; 6, reset spring; 7, mounting plate; 8, driving head; 9, reset head; 10, driving slider; 11, reset slider; 12, first motor; 13, second motor; 14, first lead screw; 15, second lead screw; 16, first guiding block; 17, first guiding groove; 18, second guiding block; 19, second guiding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] As Figures 1 to 4 shown, a geological steering device for deep coalbed methane drilling includes a drill bit 1, a fixing block 2, a sampling head 4, a driving slider 10 and a reset slider 11.

[0022] A sampling groove 3 is provided on the outer peripheral surface of the drill bit 1. A cavity is provided inside the drill bit 1. A sampling head 4 is provided in the sampling groove 3. The number of the sampling heads 4 is three, which are evenly distributed at different heights of the drill bit 1.

[0023] To ensure the center of gravity of the equipment, the sampling groove 3, the sampling head 4 and the attached driving device can be symmetrically arranged on both sides of the drill bit 1. Or a counterweight block can be arranged in the cavity of the drill bit 1.

[0024] The rear end of the sampling head 4 is connected to a mounting plate 7 in the cavity through a sliding rod 5. A return spring 6 is arranged on the sliding rod 5, and the return spring 6 is located between the mounting plate 7 and the inner wall of the cavity.

[0025] A return head 9 is arranged on one side of the mounting plate 7 close to the sampling head 4, and a driving head 8 is arranged on the other side of the mounting plate 7 away from the sampling head 4. A driving slider 10 that cooperates with the driving head 8 is slidably arranged up and down in the cavity of the drill bit 1, and a return slider 11 that cooperates with the return head 9 is slidably arranged up and down in the cavity of the drill bit 1.

[0026] The deep coalbed methane drilling geological steering device of the present utility model is equipped with a return spring 6 and a return slider 11 for the sampling head 4. When the sampling head 4 works normally, the sampling head 4 is reset by relying on the return spring 6; when the sampling head 4 is stuck by the geological layer and cannot be reset by relying on the return spring 6, the sampling head 4 can be reset by squeezing the return head 9 through the return slider 11.

[0027] The driving head 8 is an arc surface, and the driving slider 10 is provided with a circular slider that cooperates with the arc surface of the driving head 8. The return head 9 is an arc surface, and the return slider 11 is provided with a circular slider that cooperates with the arc surface of the return head 9. The design of the arc surface and the circular slider is convenient for reducing the running resistance of the equipment.

[0028] A first lead screw 14 and a second lead screw 15 are arranged in the cavity of the drill bit 1. The first lead screw 14 is in threaded cooperation with the driving slider 10, and the second lead screw 15 is in threaded cooperation with the return slider 11.

[0029] A fixing block 2 is arranged at the top of the drill bit 1. A first motor 12 and a second motor 13 are arranged in the fixing block 2. The first motor 12 drives the first lead screw 14 through a bevel gear set, and the second motor 13 drives the second lead screw 15 through a bevel gear set.

[0030] The return slider 11 and the driving slider 10 of the deep coalbed methane drilling geological steering device of the present utility model are respectively driven by independent lead screws, and the two can move independently, and the working form is more flexible.

[0031] A first guiding block 16 is arranged on the front end face of the driving slider 10, and a first guiding groove 17 which is matched with the first guiding block 16 is arranged on the inner wall of the drill bit 1; a second guiding block 18 is arranged on the front end face of the reset slider 11, and a second guiding groove 19 which is matched with the second guiding block 18 is arranged on the inner wall of the drill bit 1.

[0032] The reset slider 11 and the driving slider 10 of the deep coalbed methane drilling geological guiding device of the utility model are driven by a lead screw and limited by guiding grooves, and the movement process is more reliable.

[0033] The embodiments described above are only used to describe the preferred mode of the utility model, rather than to limit the scope of the utility model. Without departing from the design spirit of the utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A deep coalbed methane drilling geosteering device, characterized in that: The drill bit (1) comprises a sampling groove (3), a sampling head (4), a driving slider (10) and a reset slider (11). The outer peripheral surface of the drill bit (1) is provided with a sampling groove (3). The interior of the drill bit (1) is provided with a cavity. The sampling groove (3) is provided with a sampling head (4). The rear end of the sampling head (4) is connected to a mounting plate (7) in the cavity through a sliding rod (5). The sliding rod (5) is provided with a reset spring (6). The reset spring (6) is located between the mounting plate (7) and the inner wall of the cavity. The mounting plate (7) is provided with a reset head (9) on the side close to the sampling head (4). The mounting plate (7) is provided with a driving head (8) on the side away from the sampling head (4). The cavity of the drill bit (1) is provided with a driving slider (10) which can slide up and down and cooperate with the driving head (8). The cavity of the drill bit (1) is provided with a reset slider (11) which can slide up and down and cooperate with the reset head (9).

2. The deep coalbed methane drilling geosteering device according to claim 1, characterized in that: The driving head (8) is an arc surface, and the driving slider (10) is provided with a circular slider that matches the arc surface of the driving head (8).

3. The deep coalbed methane drilling geosteering device according to claim 1, characterized in that: The reset head (9) is a circular arc surface, and the reset slider (11) is provided with a circular slider that matches the circular arc surface of the reset head (9).

4. The deep coalbed methane drilling geosteering device according to claim 1, characterized in that: A first lead screw (14) and a second lead screw (15) are arranged in the cavity of the drill bit (1), wherein the first lead screw (14) is threadedly engaged with the driving slider (10), and the second lead screw (15) is threadedly engaged with the reset slider (11).

5. The deep coalbed methane drilling geosteering device according to claim 4, characterized in that: A fixing block (2) is arranged at the top of the drill bit (1), and a first motor (12) and a second motor (13) are arranged inside the fixing block (2); the first motor (12) drives the first lead screw (14) through a bevel gear set, and the second motor (13) drives the second lead screw (15) through a bevel gear set.

6. The deep coalbed methane drilling geosteering device according to claim 4, characterized in that: A first guide block (16) is arranged on the front end surface of the driving slider (10), and a first guide groove (17) cooperating with the first guide block (16) is arranged on the inner wall of the drill bit (1); a second guide block (18) is arranged on the front end surface of the reset slider (11), and a second guide groove (19) cooperating with the second guide block (18) is arranged on the inner wall of the drill bit (1).

7. The deep coalbed methane drilling geosteering device according to claim 1, characterized in that: The number of the sampling heads (4) is three, which are evenly distributed at different heights of the drill bit (1).

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