Coal seam gas extraction drilling support device and use method thereof
By designing the support body and elastic foot mechanism in the coal seam gas extraction drilling, the check components and elastic parts prevent the feet from shrinking, the problem of unstable drilling in high-gas soft coal seams is solved, and effective support for drilling is achieved The gas extraction went smoothly.
Patent Information
- Application Number
- CN202110208779.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-02-25
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2041-02-25
AI Technical Summary
The gas extraction drilling holes in high-gas fluffy coal seams are unstable, resulting in the drilling depth not meeting the standards, the hole formation is unstable, the drilling holes are prone to shrinkage, deformation and even collapse, affecting the gas extraction rate and coal mine safety production.
A support device for coal seam gas extraction drilling is designed, including a support main body and an elastic foot mechanism. The foot is equipped with a check component and an elastic member, which is connected by a spring blade. The foot is ejected in the drilling hole and the check component is maintained. Open state to prevent the feet from retracting and retrieving the storage tank to ensure effective support.
Effectively prevent drilling and hole collapse, ensure the smooth progress of gas extraction, improve the stability of drilling and gas extraction rate, improve the project progress and coal mine safety production.
Smart Images
Figure CN112682094B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of coal seam gas extraction drilling, and in particular to a supporting device for coal seam gas extraction drilling and a use method thereof. Background Art
[0002] The instability of gas extraction drilling in high-gas soft coal seams is one of the problems that restrict the efficient extraction of gas. In high-gas soft coal seams with soft coal quality, broken coal rock, and poor coal seam permeability, the drilling depth of gas extraction drilling holes often does not meet the standard, the hole formation is unstable, the hole is easy to shrink and deform, and even collapse. These phenomena greatly reduce the gas extraction rate, seriously limit the progress of the project, make the gas control effect not obvious, and seriously affect the safe production of coal mines.
[0003] In the prior art, the full-length screen pipe is often used to protect the hole to improve the stability of the drilling support. This structure includes a suspension body at the front end of the screen pipe, and a suspension wing is provided on the suspension body. The suspension wing is two pieces arranged opposite to each other and can pop out and retract from the suspension body. When drilling, the connected screen pipe and the suspension body are lowered into the open-close drill bit. At this time, the suspension wing is in a contracted state due to the limit of the inner wall of the casing. When it is lowered to the drill bit, the three "petals" in the center of the drill bit are pushed open under the action of the axial thrust, and the gas extraction screen pipe is lowered to the bottom of the borehole through the inner through hole of the drill bit. The screen pipe drives the suspension body to the bottom of the hole, and the suspension wing can be opened and stuck into the hole wall to provide certain support for the borehole. Although this method can achieve support and positioning of the borehole to a certain extent, in actual use, since the suspension wing is usually connected to the suspension body by a torsion spring to achieve the pop-up and retraction of the suspension wing, the supporting force of the suspension wing in the borehole after popping up is limited. The deformation of the borehole may cause the suspension wing that was originally in a pop-up state to shrink back into the suspension body under the action of the elastic force of the torsion spring, and it cannot play an effective supporting role in the borehole, causing the borehole to collapse and affecting the gas extraction work. Summary of the invention
[0004] In order to solve the above deficiencies in the prior art, the present invention aims to provide a support device for coal seam gas extraction drilling and a method of using the same, so as to achieve the purpose of effectively supporting the drilling hole and preventing the hole from collapsing.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a support device for gas extraction in soft coal seams, including a support body and an elastic support foot mechanism, the elastic support foot mechanism includes at least two support feet hinged to the support body, the support body is provided with a receiving groove for accommodating the support feet, each support foot is provided with an elastic member for controlling the support foot to pop out of the receiving groove to support drilling, and a non-return assembly for preventing the support foot from shrinking and recovering the receiving groove after popping out.
[0006] As a limitation of the present invention, each support leg is provided with a non-return hole for accommodating a non-return assembly, and the non-return assembly includes a first connecting rod and a second connecting rod fixedly connected by a spring.
[0007] As another limitation of the present invention, the elastic member is a spring sheet, and the two supporting legs symmetrically arranged along the circumferential direction are connected by the spring sheet.
[0008] As a further limitation of the present invention, at least one group of elastic support foot mechanisms are sequentially spaced along the axial direction of the bracket body, and each group of elastic support foot mechanisms includes a plurality of support feet symmetrically arranged along the circumferential direction.
[0009] As a further limitation of the present invention, the support legs in adjacent groups of elastic support leg mechanisms are staggered in the circumferential direction of the bracket body.
[0010] As a further limitation of the present invention, the front end portion of the bracket body is a boss, and the rear end portion is a groove.
[0011] The present invention also provides a method for using a support device for coal seam gas extraction drilling that is realized by utilizing the above-mentioned support device for coal seam gas extraction drilling, and its technical scheme is as follows: a method for using a support device for gas extraction in a soft coal seam, which is realized by utilizing the support device for gas extraction in a soft coal seam in conjunction with an open-and-closed drill bit, and comprises the following steps: the support legs are retracted into a receiving groove, and the support body is pushed into the open-and-closed drill bit until the support body is lowered from the open-and-closed drill bit into the borehole, the support legs pop outward from the receiving groove to support the borehole, and the check assembly is placed outside the receiving groove.
[0012] As a limitation of the present invention, the support leg is retracted into the storage groove, and the non-return assembly is retracted into the non-return hole, pushing the bracket body to move in the open-and-closed drill bit until the bracket body is lowered from the open-and-closed drill bit into the drill hole, and the spring sheet drives the support leg to pop out from the storage groove to support the drill hole, and the non-return assembly pops out of the non-return hole and is placed outside the storage groove.
[0013] Due to the adoption of the above technical solution, the method for using the support device for coal seam gas extraction drilling of the present invention has the following beneficial effects compared with the prior art:
[0014] (1) The present invention provides a non-return assembly on the support body. When the support leg pops out and is supported in the borehole, the non-return assembly is in an open state and is placed between the support leg and the support body. When the support leg rotates toward the receiving groove, it is restricted by the non-return assembly and stuck outside the receiving groove, effectively preventing the support leg supported in the borehole from shrinking and returning to the receiving groove, ensuring the effective support of the support leg in the borehole, preventing the borehole from collapsing, and ensuring the smooth progress of gas extraction.
[0015] (2) The structure of the non-return assembly of the present invention can ensure that when the support leg is retracted into the storage groove, the non-return assembly is also in a retracted state and stored in the support leg, and when the support leg is in a pop-up state to support drilling, the non-return assembly is in an open state and placed outside the storage groove, thereby ensuring the reliability of the overall structure.
[0016] (3) The present invention arranges elastic support foot mechanisms at intervals along the axis and arranges adjacent elastic support foot mechanisms in a staggered manner in the circumferential direction, thereby improving the support effect of the support foot and effectively preventing the hole collapse phenomenon.
[0017] The invention is suitable for use in coal seam gas extraction drilling holes and is used for supporting the drilling holes. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] Figure 1 It is a schematic diagram of the structure of the support leg of Example 1 of the present invention when it is retracted into the storage groove;
[0020] Figure 2 This is a schematic diagram of the structure of the support leg of Example 1 of the present invention when it pops up;
[0021] Figure 3 It is a structural schematic diagram of a check assembly according to Embodiment 1 of the present invention;
[0022] Figure 4 It is a schematic structural diagram of the non-return assembly of Example 2 of the present invention when it is in a retracted position;
[0023] Figure 5 It is a schematic structural diagram of the check assembly of Example 2 of the present invention when it is in an open position.
[0024] In the figure: 1. bracket body; 2. support foot; 3. storage groove; 4. spring sheet; 5. check hole; 6. spring; 7. first connecting rod; 8. second connecting rod; 9. open and close drill bit. DETAILED DESCRIPTION
[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.
[0026] Example 1 A support device for coal seam gas extraction drilling
[0027] This embodiment provides a non-return assembly on the support leg 2, which can effectively prevent the support leg 2 from shrinking back into the receiving groove 3 when the support leg 2 pops out of the drilling hole for support, thereby fixing the supporting position of the support leg 2 to provide effective support for the drilling hole.
[0028] like Figures 1 to 3As shown, this embodiment includes a bracket body 1, an elastic support foot mechanism and a non-return assembly.
[0029] The support body 1 is a cylinder, and a truncated cone-shaped boss is provided at the front end of the support body 1, and a groove is provided at the rear end of the support body 1 to facilitate the transportation and lowering of the support body 1. The support body 1 is provided with at least one set of elastic foot mechanisms in sequence along the axial direction, and in this embodiment, two sets of elastic foot mechanisms are provided along the axial direction of the support body 1.
[0030] The elastic foot mechanism is used to control the pop-up and retraction of the foot 2. Each group of elastic foot mechanisms includes a foot 2 and an elastic member. Each group of elastic foot mechanisms is provided with at least two feet 2 that are symmetrically arranged along the circumference of the bracket body 1 and are hinged to the bracket body 1. In this embodiment, each group of elastic foot mechanisms includes four feet 2 that are symmetrically arranged along the circumference of the bracket body 1, and the feet 2 in adjacent groups of elastic foot mechanisms are staggered in the circumference of the bracket body 1. A storage groove 3 is provided on the bracket body 1 corresponding to each foot 2, and the storage groove 3 is used to store the foot 2 in a retracted state. Each foot 2 is provided with an elastic member for controlling the foot 2 to pop out of the storage groove 3 to support drilling. In this embodiment, the elastic member is a spring sheet 4, and the two feet 2 that are symmetrically arranged along the circumference of the bracket body 1 are connected by the spring sheet 4.
[0031] Each leg 2 is provided with a check hole 5 for accommodating a check assembly, and a check assembly is provided in the check hole 5 for preventing the leg 2 from retracting and returning to the receiving groove 3 after popping out. The check assembly includes a first connecting rod 7 and a second connecting rod 8 that are fixedly connected by a spring 6, that is, one end of the spring 6 is fixedly connected to the first connecting rod 7, and the other end of the spring 6 is fixedly connected to the second connecting rod 8, and the axes of the first connecting rod 7, the spring 6 and the second connecting rod 8 are coaxial with the check hole 5. The retracted position of the check assembly corresponds to the retracted position of the leg 2, and the open position of the check assembly corresponds to the pop-out position of the leg 2.
[0032] The method of using this embodiment is shown in Example 2.
[0033] Example 2: Method for using a support device for coal seam gas extraction drilling
[0034] This embodiment utilizes the support device for coal seam gas extraction drilling in Embodiment 1 in combination with an open-close drill bit, and includes the following steps:
[0035] like Figure 4 As shown, the support device for coal seam gas extraction drilling is placed in the open-and-close drill bit 9. Under the restriction of the inner wall of the open-and-close drill bit 9, the support leg 2 is retracted into the receiving groove 3 in the bracket body 1; and restricted by the receiving groove 3, the non-return assembly spring 6 is in a retracted state, so that the first connecting rod 7, the spring 6 and the second connecting rod 8 are restricted in the non-return hole 5 of the support leg 2, that is, the retracted position of the non-return assembly corresponds to the retracted position of the support leg 2.
[0036] The support body 1 is pushed inside the open-close drill bit 9 toward the front end of the drill bit, and the support body 1 pushes the front end of the open-close drill bit 9 open, so that the support body 1 is separated from the closed drill bit 9 and goes down into the drill hole. Figure 5 As shown. Under the action of the spring sheet 4, the support leg 2 is driven to pop out of the receiving slot 3 and support the drill hole. At the same time, the spring 6 of the non-return assembly is freed from the restriction of the receiving slot 3 and restored to a free state, so that the total length of the first connecting rod 7, the spring 6 and the second connecting rod 8 is greater than the axial length of the non-return hole 5. The first connecting rod 7 and the second connecting rod 8 extend out of the non-return hole 5 and are placed outside the receiving slot 3. At this time, the non-return assembly is in the open position. When the support leg 2 retracts to the receiving slot 3, the non-return assembly clamps the support leg 2 outside the receiving slot 3, and the rotation of the support leg 2 is restricted, preventing the support leg 2 from retracting back into the receiving slot 3.
[0037] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A method for using a support device for gas extraction in soft coal seams, characterized in that: The support device for gas extraction in soft coal seams includes a support body and an elastic support foot mechanism, wherein the elastic support foot mechanism includes at least two support feet hinged to the support body, and a receiving groove for accommodating the support feet is provided on the support body. Each support foot is provided with an elastic member for controlling the support foot to pop out of the receiving groove to support drilling, and a non-return assembly for preventing the support foot from shrinking and recovering the receiving groove after popping out; Each support leg is provided with a check hole for accommodating a check assembly, wherein the check assembly comprises a first connecting rod and a second connecting rod fixedly connected by a spring; The support leg is retracted into the storage groove, and the non-return assembly is retracted into the non-return hole, pushing the bracket body to move in the open-close drill bit until the bracket body is lowered from the open-close drill bit into the drill hole, and the spring sheet drives the support leg to pop out from the storage groove to support the drill hole, and the non-return assembly pops out of the non-return hole and is placed outside the storage groove.
2. The method for using the support device for gas extraction in soft coal seams according to claim 1 is characterized in that: The elastic member is a spring sheet, and two supporting legs symmetrically arranged along the circumferential direction are connected by the spring sheet.
3. The method for using the support device for gas extraction in soft coal seams according to claim 2 is characterized in that: At least one group of elastic support foot mechanisms are sequentially arranged at intervals along the axial direction of the bracket body, and each group of elastic support foot mechanisms includes a plurality of support feet symmetrically arranged along the circumferential direction.
4. The method for using the support device for gas extraction in soft coal seams according to claim 3 is characterized in that: The supporting feet in adjacent groups of elastic supporting foot mechanisms are staggeredly arranged in the circumferential direction of the bracket body.
5. The method for using the support device for gas extraction in soft coal seams according to claim 3 or 4, characterized in that: The front end of the bracket body is a boss, and the rear end is a groove.