Coring drilling tool device

Abstract

The invention provides a coring drilling tool device which comprises an outer drilling rod, the outer drilling rod is of a splicing structure, an inner drilling rod is installed in the bottom end of the outer drilling rod in a threaded connection mode, a core barrel is installed at the top of the inner drilling rod in a threaded connection mode, a splicing pipe is installed at the top of the core barrel in a threaded connection mode, and a connecting rod mechanism is movably arranged in the splicing pipe. A spiral blade is arranged at the external position of the center in the core barrel through a second rotating rod, and the top end of the spiral blade is arranged in the bottom end of the core barrel. By forming the spiral inner cavity in the core barrel and filling the spiral inner cavity with the liquid nitrogen, a sample in the core barrel can be conveniently frozen through the liquid nitrogen, so that decomposition and dissipation of coal bed gas are inhibited, a high-quality coal bed sample is obtained, damage to a core is avoided, and the core recovery rate and integrity are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of exploration coring drill tools, in particular to a coring drill tool device. Background Art

[0002] Coring drill is a rock sampling device used in geological exploration and mineral resource development. Coalbed methane development first requires the clarification of key parameters such as the coalbed methane content in the reservoir, which is particularly important for coalbed methane resource evaluation, production capacity prediction, and risk management. From the perspective of engineering technology, the most direct and effective way to accurately obtain the deep coalbed methane content is to use coring technology to obtain the original coal seam samples.

[0003] The Chinese utility model patent with announcement number CN221920897U proposes a multi-tube drilling coring drill tool for rock and soil drilling sampling, including a rotating end, a mounting plate, a locking screw sleeve, a locking nut and an anti-retraction nut, wherein a first step is arranged on the rotating end, grooves are arranged at equal intervals on the rotating end, and the grooves are all of a through structure, and sliding grooves are arranged on the rotating end and in the corresponding grooves, and the sliding grooves are arranged as an open structure; the number of the mounting plates is the same as the grooves, a cutter head is fixedly connected to one end of the mounting plates, a second step is arranged on the mounting plates, and clamping plates are fixedly connected to both sides of the mounting plates, and the clamping plates are slidably connected to the corresponding sliding grooves.

[0004] Although the above-mentioned coring drill tools can be used to sample coal seams, due to the low strength of coal reservoirs, large deformation, strong heterogeneity, and easy analysis and escape of coalbed methane, as well as the influence of formation temperature and pressure, conventional oil and gas well coring tools are unable to obtain high-quality and authentic coal seam samples.

[0005] To this end, the present invention provides a coring drill device. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a coring drilling device to solve the problems raised in the above-mentioned background technology. The present invention opens a spiral inner cavity inside the core tube and fills the inner cavity of the spiral inner cavity with liquid nitrogen, so as to facilitate freezing of the sample inside the core tube by liquid nitrogen, thereby inhibiting the decomposition and escape of coalbed methane, facilitating the acquisition of high-quality coal seam samples, avoiding damage to the core, and effectively improving the core sampling rate and integrity.

[0007] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a coring drilling device, including an outer drill rod, the outer drill rod is a splicable structure, the bottom end of the outer drill rod is internally screwed with an inner drill rod, the top of the inner drill rod is screwed with a core tube, the top of the core tube is screwed with a splicing tube, a connecting rod mechanism is movably arranged inside the splicing tube, a spiral blade is arranged at the external center of the inner core tube through a second rotating rod, the top of the spiral blade is arranged inside the bottom end of the core tube, the bottom end of the spiral blade is arranged inside the top end of the inner drill rod, a spiral inner cavity is opened inside the inner wall of the core tube, and the spiral inner cavity is arranged on the outside of the second rotating rod, the connecting rod mechanism includes a cross bar and a first rotating rod, the cross bar is fixedly installed inside the top and bottom ends of the splicing tube, and a gap is arranged between the cross bar and the inner wall of the splicing tube.

[0008] Furthermore, a first drill bit is fixedly arranged on the outer wall of the bottom end of the outer drill rod, and a reamer is fixedly arranged on the outer wall of the outer drill rod.

[0009] Furthermore, the outer drill rod and the inner drill rod are both hollow structures, a second drill bit is fixedly provided at the bottom end of the inner drill rod, and the bottom of the second drill bit is in the same horizontal plane as the bottom of the first drill bit.

[0010] Furthermore, a fixing ring is fixedly provided on the inner wall of the outer drill rod, and the fixing ring is arranged on the outer sides of the inner drill rod, the core tube and the spliced ​​tube and is in close contact with them.

[0011] Furthermore, a discharge port is provided at the bottom end of the spiral inner cavity corresponding to the inside of the core tube, and a sealing plug is threadedly installed inside the discharge port. The sealing plug is arranged on the inner side of the fixing ring and is in close contact with the fixing ring.

[0012] Furthermore, an inlet is opened at the top of the spiral inner cavity, and a sealing plug is threadedly installed inside the inlet. The sealing plug is arranged at the bottom of the spliced ​​tube and is in close contact with it.

[0013] Furthermore, an exhaust hole is provided inside the top of the core tube corresponding to the outer side of the second rotating rod, and the second rotating rod is slidably installed inside the top of the core tube. The exhaust hole communicates with the core tube and the splicing tube.

[0014] Furthermore, the first rotating rod and the second rotating rod are both in a "T" shape, and the first rotating rod is installed inside the cross bar for limited rotation.

[0015] Furthermore, the first rotating rod is arranged inside the splicing tube, and regular polygonal grooves are formed inside the top ends of the first rotating rod and the second rotating rod.

[0016] Furthermore, a regular polygonal rod is fixedly provided at the bottom end of the first rotating rod, and the regular polygonal rod is plugged and installed inside the regular polygonal groove.

[0017] Beneficial effects of the present invention: A coring drilling device of the present invention comprises an outer drill rod, a first drill bit, a reamer, an inner drill rod, a spliced ​​tube, a core tube, a connecting rod mechanism, a second rotating rod, spiral blades, a second drill bit, a spiral inner cavity, a fixing ring, a cross bar, a regular polygonal groove, an exhaust hole, an exhaust port, a first rotating rod, and a regular polygonal rod.

[0018] 1. The coring drilling tool device is provided with a spiral inner cavity inside the core tube, and liquid nitrogen is added to the inner part of the spiral inner cavity, so that the sample inside the core tube can be frozen by liquid nitrogen, thereby inhibiting the decomposition and escape of coalbed methane, thereby obtaining high-quality coal seam samples, avoiding damage to the coal core, and effectively improving the core collection rate and integrity; by arranging a spiral blade at the bottom end of the core tube, the bottom end of the core tube can be closed when the splicing tube and the core tube are pulled, so that the core sample can be blocked, and the core sample can be fixed inside the core tube, so that the core sample can be conveniently taken out from the rock formation.

[0019] 2. The top and bottom ends of the spiral inner cavity of the coring drilling device are respectively provided with an inlet and a discharge port, which can be used to fill the interior of the spiral inner cavity with liquid nitrogen and discharge it from the interior of the spiral inner cavity, so as to replenish the liquid nitrogen; the inlet and the discharge port are both provided with sealing plugs, which are convenient for sealing the spiral inner cavity, and the sealing plug can be limited by the splicing tube and the fixing ring, which can improve the stability of the sealing plug and prevent the sealing plug from falling off due to vibration; the fixing ring can also position and install the inner drill rod, the core tube and the splicing tube.

[0020] 3. The coring drill device, through the provision of regular polygonal grooves and regular polygonal rods, facilitates the splicing between the first rotating rod and the second rotating rod, and between the first rotating rod and the first rotating rod, thereby facilitating manual rotation adjustment of the first rotating rod, the second rotating rod and the spiral blade, and facilitating manual limiting of the spiral blade, thereby improving the efficiency of core sample collection; it is also possible to conveniently discharge the sample inside the core tube by rotating the second rotating rod and the spiral blade, facilitating subsequent testing of the core sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A structural diagram of a coring drilling device of the present invention;

[0022] Figure 2 A front cross-sectional view of a coring drilling device of the present invention;

[0023] Figure 3 A coring drilling device of the present invention Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a structural diagram of an inner drill pipe, a core pipe and a spliced ​​pipe of a coring drilling device of the present invention;

[0025] Figure 5 A core tube structure diagram of a coring drilling device of the present invention;

[0026] Figure 6 A splicing diagram of a splicing pipe of a coring drilling device of the present invention;

[0027] In the figure: 1, outer drill rod; 2, first drill bit; 3, reamer; 4, inner drill rod; 5, spliced ​​tube; 6, core tube; 7, connecting rod mechanism; 8, second rotating rod; 9, spiral blade; 10, second drill bit; 11, spiral inner cavity; 12, fixing ring; 13, cross bar; 14, regular polygonal groove; 15, exhaust hole; 16, exhaust port; 17, first rotating rod; 18, regular polygonal rod. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] See also Figures 1 to 6 The present invention provides a technical solution: a coring drilling device, comprising an outer drill rod 1, the outer drill rod 1 is a splicable structure, the inner bottom end of the outer drill rod 1 is screwed with an inner drill rod 4, the top of the inner drill rod 4 is screwed with a core tube 6, the top of the core tube 6 is screwed with a splicing tube 5, a connecting rod mechanism 7 is movably arranged inside the splicing tube 5, a spiral blade 9 is arranged at the outer center of the core tube 6 through a second rotating rod 8, the top end of the spiral blade 9 is arranged inside the bottom end of the core tube 6, the bottom end of the spiral blade 9 is arranged inside the top end of the inner drill rod 4, the A spiral inner cavity 11 is opened inside the inner wall of the core tube 6, and the spiral inner cavity 11 is arranged on the outside of the second rotating rod 8. The connecting rod mechanism 7 includes a cross bar 13 and a first rotating rod 17. The cross bar 13 is fixedly installed inside the top and bottom ends of the spliced ​​tube 5. A gap is provided between the cross bar 13 and the inner wall of the spliced ​​tube 5. By adding liquid nitrogen inside the spiral inner cavity 11, it is convenient for liquid nitrogen to freeze the core sample inside the core tube 6, thereby inhibiting the decomposition and escape of coalbed methane, facilitating the acquisition of high-quality coal seam samples, avoiding damage to the core, and effectively improving the core collection rate and integrity.

[0030] In this embodiment, a first drill bit 2 is fixedly provided on the outer wall of the bottom end of the outer drill rod 1, and a reamer 3 is fixedly provided on the outer wall of the outer drill rod 1. The outer drill rod 1 and the inner drill rod 4 are both hollow structures. A second drill bit 10 is fixedly provided on the bottom end of the inner drill rod 4. The bottom of the second drill bit 10 and the bottom of the first drill bit 2 are in the same horizontal plane. Through the cooperation of the first drill bit 2 and the second drill bit 10, it is convenient to sample the core, and the reamer 3 is used to expand the borehole, so that the outer drill rod 1 can be moved inside the borehole.

[0031] In this embodiment, a fixing ring 12 is fixedly provided on the inner wall of the outer drill rod 1, and the fixing ring 12 is arranged on the outside of the inner drill rod 4, the core tube 6 and the splicing tube 5 and is in close contact with each other. A discharge port 16 is provided at the bottom end of the spiral inner cavity 11 corresponding to the inside of the core tube 6, and a sealing plug is screwed and installed inside the discharge port 16, and the sealing plug is arranged on the inner side of the fixing ring 12 and in close contact with each other. An inlet is provided at the top of the spiral inner cavity 11, and a sealing plug is screwed and installed inside the inlet, and the sealing plug is arranged at the bottom of the splicing tube 5 and in close contact with each other. The sealing plug inside the discharge port 16 can be limited by the setting of the fixing ring 12, and the splicing tube 5 can limit the sealing plug inside the inlet, thereby improving the stability of the sealing plug, preventing the sealing plug from falling off due to vibration, avoiding leakage of liquid nitrogen, and facilitating the subsequent freezing of the core sample inside the core tube 6. Liquid nitrogen can be added to the inside of the spiral inner cavity 11 through the setting of the inlet and the discharge port 16.

[0032] In this embodiment, an exhaust hole 15 is provided inside the top of the core tube 6 corresponding to the outer side of the second rotating rod 8, and the second rotating rod 8 is slidably installed inside the top of the core tube 6, and the exhaust hole 15 connects the core tube 6 and the splicing tube 5. The first rotating rod 17 and the second rotating rod 8 are both "T"-shaped, and the first rotating rod 17 is limitedly rotated inside the cross bar 13, and the first rotating rod 17 is arranged inside the splicing tube 5. A regular polygonal groove 14 is provided inside the top of the first rotating rod 17 and the second rotating rod 8, and a regular polygonal rod 18 is fixedly provided at the bottom end of the first rotating rod 17, and the regular polygonal rod 18 is plugged and installed inside the regular polygonal groove 14. The first rotating rod 17 and the second rotating rod 8 can be plugged and connected through the regular polygonal groove 14 and the regular polygonal rod 18, so that the spiral blade 9 can be fixed and rotated by the first rotating rod 17 and the second rotating rod 8, so that the core sample can be discharged into the core tube 6, the efficiency of core sample collection can be improved, and the splicing tube 5 and the core tube 6 can be disassembled and separated.

[0033] When the coring drilling device is used, the outer drill rods 1 are spliced ​​and fixed, and fixedly connected to the drilling machine. The drilling machine drives the outer drill rod 1 to drill holes in rock formations, coal seams, etc., and a plugging tube is installed inside the outer drill rod 1. The bottom end of the outer drill rod 1 is sealed by the plugging tube. While the outer drill rod 1 is drilling, rock formation waste is discharged from the borehole. Before the outer drill rod 1 reaches the coal reservoir, the plugging tube is taken out from the outside of the outer drill rod 1, and the inner drill rod 4 is screwed and installed at the bottom end of the core tube 6, and the bottom end of the spiral blade 9 is inserted into the inside of the inner drill rod 4, the sealing plug inside the inlet is removed, liquid nitrogen is added to the inside of the spiral inner cavity 11, and the inlet is sealed by the sealing plug. The spliced ​​tube 5 is screwed and installed on the top of the core tube 6, and the spliced ​​tube 5 drives the first rotating rod 17 and the regular polygon rod 18, and the regular polygon rod 18 is inserted into the regular polygon groove 14, and multiple spliced ​​tubes 5 are continued to be spliced ​​on the top of the spliced ​​tube 5, and the first rotating rod 17 between the spliced ​​tubes 5 is connected through the regular polygon rod 18 and the regular polygon groove 14; and a transverse hole is opened at the splicing of the inner drill rod 4, the core tube 6 and the spliced ​​tube 5, and bolts are installed. After the splicing is completed, the inner drill rod 4, the core tube 6 and the spliced ​​tube 5 are installed inside the outer drill rod 1, and the inner drill rod 4 and the outer drill rod 1 are screwed and installed. The set fixing ring 12 can fix the inner drill rod 4, the core tube 6 and the spliced The tube 5 is positioned and limited, and the fixing ring 12 can block the outside of the sealing plug inside the discharge port 16, which is convenient for limiting the sealing plug and preventing the sealing plug from falling off, thereby preventing liquid nitrogen leakage; since the inner drill rod 4 and the outer drill rod 1 are screwed and fixedly connected, when the outer drill rod 1 rotates, it can drive the inner drill rod 4, the core tube 6, and the splicing tube 5 to rotate synchronously, and the first rotating rod 17 is fixed with a tool, so that the first rotating rod 17, the second rotating rod 8 and the core tube 6 rotate relative to each other, and under the action of the spiral blades 9, the core sample can be quickly discharged into the interior of the core tube 6, and the air inside the core tube 6 passes through the exhaust hole 15, the cross bar 13 and the splicing tube 5 The gap between them is discharged, and at the same time, the liquid nitrogen inside the spiral inner cavity 11 can freeze the core sample, thereby inhibiting the decomposition and escape of coalbed methane, so as to obtain high-quality coal seam samples, avoid damage to the coal core, and effectively improve the core collection rate and integrity; after the sampling is completed, the splicing tube 5, the core tube 6 and the inner drill rod 4, as well as the first rotating rod 17 and the second rotating rod 8 are synchronously rotated in reverse to take them out from the inside of the outer drill rod 1, and the set spiral blades 9 can seal the bottom end of the core tube 6 to prevent the core sample from falling, and the core tube 6 is separated from the splicing tube 5 and the outer drill rod 1, and finally the core tube 6 and the core sample inside it are placed in a liquid nitrogen container for further freezing.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A coring drilling device, comprising an outer drill rod (1), characterized in that: The outer drill rod (1) is a splicable structure. The inner drill rod (4) is screwed and installed at the bottom of the outer drill rod (1). The core tube (6) is screwed and installed at the top of the inner drill rod (4). The splicing tube (5) is screwed and installed at the top of the core tube (6). A connecting rod mechanism (7) is movably arranged inside the splicing tube (5). A spiral blade (9) is arranged at the outer center of the core tube (6) through a second rotating rod (8). The top of the spiral blade (9) is arranged at the core tube ( 6), the bottom end of the spiral blade (9) is arranged inside the top end of the inner drill rod (4), the inner wall of the core tube (6) is provided with a spiral inner cavity (11), the spiral inner cavity (11) is arranged outside the second rotating rod (8), the connecting rod mechanism (7) comprises a cross bar (13) and a first rotating rod (17), the cross bar (13) is fixedly mounted inside the top end and the bottom end of the splicing tube (5), and a gap is arranged between the cross bar (13) and the inner wall of the splicing tube (5).

2. A coring drilling device according to claim 1, characterized in that: A first drill bit (2) is fixedly arranged on the outer wall of the bottom end of the outer drill rod (1), and a reamer (3) is fixedly arranged on the outer wall of the outer drill rod (1).

3. A coring drilling device according to claim 2, characterized in that: The outer drill rod (1) and the inner drill rod (4) are both hollow structures; a second drill bit (10) is fixedly arranged at the bottom end of the inner drill rod (4); and the bottom of the second drill bit (10) is in the same horizontal plane as the bottom of the first drill bit (2).

4. A coring drilling device according to claim 1, characterized in that: A fixing ring (12) is fixedly arranged on the inner wall of the outer drill rod (1), and the fixing ring (12) is arranged on the outer sides of the inner drill rod (4), the core tube (6) and the spliced ​​tube (5) and is in close contact with them.

5. A coring drilling device according to claim 4, characterized in that: A discharge port (16) is provided at the bottom end of the spiral inner cavity (11) corresponding to the interior of the core tube (6), and a sealing plug is threadedly installed inside the discharge port (16), and the sealing plug is arranged on the inner side of the fixing ring (12) and in close contact.

6. A coring drilling device according to claim 5, characterized in that: An inlet is provided at the top of the spiral inner cavity (11), a sealing plug is threadedly installed inside the inlet, and the sealing plug is arranged at the bottom of the spliced ​​tube (5) and in close contact.

7. A coring drilling device according to claim 1, characterized in that: An exhaust hole (15) is provided inside the top end of the core tube (6) corresponding to the outer side of the second rotating rod (8), and the second rotating rod (8) is slidably mounted inside the top end of the core tube (6). The exhaust hole (15) communicates with the core tube (6) and the splicing tube (5).

8. A coring drilling device according to claim 7, characterized in that: The first rotating rod (17) and the second rotating rod (8) are both T-shaped, and the first rotating rod (17) is installed inside the crossbar (13) for limited rotation.

9. A coring drilling device according to claim 8, characterized in that: The first rotating rod (17) is arranged inside the splicing tube (5), and the top ends of the first rotating rod (17) and the second rotating rod (8) are both provided with regular polygonal grooves (14).

10. A coring drilling device according to claim 9, characterized in that: A regular polygonal rod (18) is fixedly provided at the bottom end of the first rotating rod (17), and the regular polygonal rod (18) is inserted and installed inside the regular polygonal groove (14).

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