A double-layer combined coring drill pipe for offshore drilling

Abstract

The present application relates to the technical field of offshore oil drilling and sampling equipment, and particularly relates to a double-layer combined coring drill rod for offshore drilling. The present application relates to the technical field of offshore oil drilling and sampling equipment, and particularly relates to a double-layer combined coring drill rod for offshore drilling. The double-layer combined coring drill rod comprises a drill bit, a first drill rod, a second drill rod, a first sleeve, a second sleeve and two sets of limiting assemblies. The first sleeve is sleeved on the outer wall of the first drill rod, the second sleeve is sleeved on the outer wall of the second drill rod, the second drill rod is connected with the first drill rod, the drill bit is connected with the second drill rod, the limiting assembly comprises a sliding rod, a pull block, a limiting spring, a bearing block and a clamping sleeve, the second sleeve is provided with a bearing groove, the bearing block is matched with the bearing groove, the clamping sleeve is fixedly connected with the bearing block, the first sleeve is provided with a groove, the limiting spring is arranged in the groove, the clamping sleeve is further fixedly connected with the limiting spring, the two ends of the sliding rod are fixedly connected with the clamping sleeve and the pull block respectively and are inserted into the groove, and the sliding rod is slidably connected with the first sleeve. Through the arrangement of the above structure, the drill rod is convenient to transport when working at sea.

Description

Technical Field

[0001] This invention relates to the field of offshore oilfield drilling and sampling equipment technology, and in particular to a double-layer combined coring drill pipe for offshore drilling. Background Technology

[0002] The ocean is the largest body of water on Earth, teeming with life and rich in mineral resources, including methane hydrate, natural gas, and oil. Oil is a particularly abundant and valuable mineral resource. Before offshore oil extraction, it is necessary to explore the seabed for oil, which requires the use of exploration and sampling drill bits and drill pipes.

[0003] However, the existing drilling pipes for exploration and sampling are quite long, making them inconvenient to transport when operating at sea. Summary of the Invention

[0004] The purpose of this invention is to provide a double-layer combined coring drill pipe for marine drilling, which solves the problem that existing exploration and sampling drill pipes are too long and inconvenient to transport during offshore operations.

[0005] To achieve the above objectives, the present invention employs a double-layer combined coring drill pipe for marine drilling, comprising a drill bit, a first drill pipe, a second drill pipe, a first sleeve, a second sleeve, and two sets of limiting components. The first sleeve is fitted onto the outer wall of the first drill pipe, and the second sleeve is fitted onto the outer wall of the second drill pipe. The second drill pipe is connected to the first drill pipe, and the second sleeve is fitted into the first sleeve. The drill bit is connected to the second drill pipe. The limiting components include a sliding rod, a pull block, a limiting spring, a retaining block, and a clamp. The second sleeve has a retaining groove, the retaining block is adapted to the retaining groove, and the clamp is fixedly connected to the retaining block. The first sleeve has a groove, the limiting spring is disposed in the groove, and the clamp is also fixedly connected to the limiting spring. The two ends of the sliding rod are fixedly connected to the clamp and the pull block respectively, and inserted into the groove. The sliding rod is slidably connected to the first sleeve.

[0006] The limiting component further includes a compression arc block, which is fixedly connected to the sleeve and located on the outer side wall of the sleeve.

[0007] The limiting component further includes a rubber pad, which is fixedly connected to the sleeve and located on the inner wall of the sleeve.

[0008] The limiting component further includes a protective cover, which is detachably connected to the first sleeve and located outside the pull block.

[0009] The double-layer combined coring drill rod for offshore drilling further comprises a positioning assembly arranged in the first sleeve.

[0010] The positioning assembly comprises a guide pipe, two guide rails and a plurality of guide wheels. The guide pipe is fixedly connected with the first sleeve and located on the outer sidewall of the first sleeve. The two guide rails are symmetrically arranged in the first sleeve, and each guide rail is provided with a plurality of guide wheels.

[0011] The positioning assembly further comprises a smooth washer fixedly connected with the guide pipe and located on the inner wall of the guide pipe.

[0012] The double-layer combined coring drill rod for offshore drilling has the following advantages. When the drill rod is transported, the pulling block is pulled on the outer wall of the first sleeve, so that the abutting block on the clamping sleeve is separated from the abutting groove of the second sleeve. At this time, the clamping sleeve is inserted into the groove, and then the second sleeve is pulled outwards, so that the second drill rod is separated from the first drill rod. Therefore, the first drill rod and the second drill rod are conveniently assembled and disassembled, and the operation is more convenient and faster than the conventional threaded connection. When the drill rod is transported on the sea, the operation is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0014] Figure 1 is the overall structure schematic diagram of the first embodiment of the present application.

[0015] Figure 2 is the overall internal structure cross-sectional view of the first embodiment of the present application.

[0016] Figure 3 is the overall structure schematic diagram of the second embodiment of the present application. Figure 2 is the enlarged view of the local structure at A of the second embodiment of the present application.

[0017] Figure 4 is the overall structure schematic diagram of the second embodiment of the present application.

[0018] Figure 5 is the overall internal structure cross-sectional view of the second embodiment of the present application.

[0019] Figure 6 is the overall structure schematic diagram of the second embodiment of the present application. Figure 5is an enlarged view of the local structure at B of

[0020] Figure 7 is a whole internal structure sectional view of the third embodiment of the present application.

[0021] Figure 8 is a whole internal structure sectional view of the third embodiment of the present application. Figure 7 is an enlarged view of the local structure at C of

[0022] 101-first drill rod, 102-second drill rod, 103-first sleeve, 104-second sleeve, 105-sliding rod, 106-pull block, 107-limiting spring, 108-abutting block, 109-clip sleeve, 110-extrusion arc block, 111-rubber pad, 112-protective cover, 113-abutting groove, 114-groove, 115-drill bit, 201-guide pipe, 202-guide rail, 203-guide wheel, 204-smooth washer, 301-torsion spring, 302-sealing pad, 303-waterproof pad. DETAILED DESCRIPTION

[0023] The first embodiment is:

[0024] Please refer to Figures 1-3 , wherein Figure 1 is a whole structure schematic view of the first embodiment, Figure 2 is a whole internal structure sectional view of the first embodiment, Figure 3 is Figure 2 is an enlarged view of the local structure at A of the present application provides a double-layer combined coring drill rod for ocean drilling, comprising a drill bit 115, a first drill rod 101, a second drill rod 102, a first sleeve 103, a second sleeve 104 and two sets of limiting assemblies, the limiting assembly comprises a sliding rod 105, a pull block 106, a limiting spring 107, an abutting block 108, a clip sleeve 109, an extrusion arc block 110, a rubber pad 111 and a protective cover 112;

[0025] For this specific embodiment, the first sleeve 103 is sleeved on the outer wall of the first drill rod 101, the second sleeve 104 is sleeved on the outer wall of the second drill rod 102, the second drill rod 102 is connected with the first drill rod 101, the second sleeve 104 is embedded with the first sleeve 103, the drill bit 115 is connected with the second drill rod 102, the first sleeve 103 and the second sleeve 104 are respectively sleeved on the first drill rod 101 and the second drill rod 102, which can protect the first drill rod 101 and the second drill rod 102, improve the durability of the first drill rod 101 and the second drill rod 102, sequentially connect the second drill rod 102, the first drill rod 101 and the drill bit 115, and form a drill rod for ocean exploration sampling.

[0026] The second sleeve 104 has a bearing groove 113, the bearing block 108 is matched with the bearing groove 113, the clamp sleeve 109 is fixedly connected with the bearing block 108, the first sleeve 103 has a recess 114, the limiting spring 107 is arranged in the recess 114, the clamp sleeve 109 is also fixedly connected with the limiting spring 107, both ends of the sliding rod 105 are fixedly connected with the clamp sleeve 109 and the pull block 106 respectively and are inserted into the recess 114, and the sliding rod 105 is in sliding connection with the first sleeve 103.

[0027] Secondly, the extrusion arc block 110 is fixedly connected with the clamp sleeve 109 and is located at the outer side wall of the clamp sleeve 109, the second sleeve 104 is facilitated to enter the clamp sleeve 109 through the extrusion arc block 110, and the clamp sleeve 109 and the bearing block 108 fix the second sleeve 104 on the first sleeve 103.

[0028] Meanwhile, the rubber pad 111 is fixedly connected with the clamp sleeve 109 and is located at the inner wall of the clamp sleeve 109, the rubber pad 111 can increase the friction between the clamp sleeve 109 and the outer wall of the second sleeve 104, and the second sleeve 104 is more stably fixed.

[0029] In addition, the protective cover 112 is detachably connected with the first sleeve 103 and is located outside the pull block 106, the protective cover 112 can cover the pull block 106, avoids that the pull block 106 is in contact with the outside during operation, and causes the second drill rod 102 and the first drill rod to be separated.

[0030] When transporting the drill pipe, the protective cover 112 is removed from the outer wall of the first sleeve 103, then the pulling block 106 is pulled on the outer wall of the first sleeve 103, the pulling block 106 makes the abutting block 108 on the clamping sleeve 109 leave the abutting groove 113 of the second sleeve 104, at this time the clamping sleeve 109 enters the recess 114, then the second sleeve 104 is pulled outwards, the second drill pipe 102 is separated from the first drill pipe 101, after separation, the protective cover 112 is reset on the outer wall of the first sleeve 103, so that the first drill pipe 101 and the second drill pipe 102 are conveniently assembled and disassembled, and the installation or disassembly process is more convenient and fast relative to the conventional threaded connection, the second sleeve 104 is conveniently entered into the clamping sleeve 109 through the extrusion arc block 110, the clamping sleeve 109 and the abutting block 108 fix the second sleeve 104 on the first sleeve 103, and the rubber pad 111 can increase the friction between the clamping sleeve 109 and the outer wall of the second sleeve 104, and more stably fix the second sleeve 104, so that the drill pipe is conveniently transported when working at sea.

[0031] The second embodiment is:

[0032] On the basis of the first embodiment, please refer to Figures 4-6 , wherein Figure 4 is a structural schematic diagram of the whole of the second embodiment, Figure 5 is a sectional view of the internal structure of the whole of the second embodiment, Figure 6 is an enlarged view of the local structure at B of Figure 5 The double-layer combined coring drill pipe for offshore drilling provided by the present application further comprises a positioning assembly, and the positioning assembly comprises a guide pipe 201, two guide rails 202, a plurality of guide wheels 203 and a smooth washer 204.

[0033] For the specific embodiment, the positioning assembly is arranged in the first sleeve 103, and the second sleeve 104 is conveniently entered into the first sleeve 103 through the positioning assembly, so that the second drill pipe 102 is connected with the first drill pipe 101.

[0034] The guide pipe 201 is fixedly connected with the first sleeve 103 and located on the outer sidewall of the first sleeve 103, the two guide rails 202 are symmetrically arranged in the first sleeve 103, and a plurality of guide wheels 203 are arranged on each guide rail 202; when the first drill rod 101 and the second drill rod 102 are connected, the second sleeve 104 is inserted into the guide pipe 201, the second sleeve 104 is in contact with the guide wheels 203 on the guide rail 202, the second sleeve 104 is pushed to the first sleeve 103 by the contact with the guide wheels 203, and the second drill rod 102 is connected with the first drill rod 101.

[0035] Secondly, the smooth washer 204 is fixedly connected with the guide pipe 201 and located on the inner wall of the guide pipe 201, the smooth washer 204 can reduce the friction between the second sleeve 104 and the guide pipe 201, and the second sleeve 104 is facilitated to enter the first sleeve 103 through the guide pipe 201.

[0036] When the first drill rod 101 and the second drill rod 102 are connected, the smooth washer 204 on the inner wall of the guide pipe 201 is in contact with the second sleeve 104 by inserting the second sleeve 104 into the guide pipe 201, the second sleeve 104 is facilitated to move, the second sleeve 104 is in contact with the guide wheels 203 on the guide rail 202 by continuing to push the second sleeve 104, the second sleeve 104 is pushed to the first sleeve 103 by the contact with the guide wheels 203, and the second drill rod 102 is connected with the first drill rod 101.

[0037] The third embodiment is:

[0038] On the basis of the first embodiment, refer to Figure 7 and Figure 8 , wherein Figure 7 is the overall internal structure of the third embodiment, Figure 8 is Figure 7 the enlarged view of the local structure at C of The double-layer combined coring drill rod for ocean drilling further comprises a sealing assembly, and the sealing assembly comprises two torsional springs 301, two sealing pads 302 and two waterproof pads 303.

[0039] For the specific embodiment, the sealing assembly is arranged in the first rotating rod, and the sealing assembly can improve the sealing performance of the connection between the first drill rod 101 and the second drill rod 102.

[0040] Two torsional springs 301 are symmetrically arranged on the first drill pipe 101, and two sealing pads 302 are fixedly connected with the corresponding torsional springs 301 and symmetrically arranged on the first drill pipe 101.

[0041] Secondly, two waterproof pads 303 are fixedly connected with the corresponding sealing pads 302, and the waterproof pads 303 can cover and protect the torsional springs 301 to avoid the torsional springs 301 being exposed.

[0042] When the second drill pipe 102 is connected with the first drill pipe 101, the second drill pipe 102 will contact and extrude the sealing pad 302 at the connection of the first drill pipe 101, and the sealing pad 302 is located between the first drill pipe 101 and the second drill pipe 102, the waterproof pad 303 can cover and protect the torsional spring 301 to avoid the torsional spring 301 being exposed, and the sealing property of the connection of the first drill pipe 101 and the second drill pipe 102 is improved.

[0043] The above only discloses a preferred embodiment of the present application, and of course cannot limit the scope of the present application, and those skilled in the art can understand that all or part of the above-mentioned embodiments can be implemented, and equivalent changes made according to the claims of the present application still belong to the scope of the present application.

Claims

1. A double-layer combined coring drill pipe for offshore drilling, comprising a drill bit, a first drill pipe, a second drill pipe, a first sleeve and a second sleeve, the first sleeve being sleeved on the outer wall of the first drill pipe, the second sleeve being sleeved on the outer wall of the second drill pipe, the second drill pipe being connected with the first drill pipe, the second sleeve being fitted with the first sleeve, and the drill bit being connected with the second drill pipe, characterized in that it further comprises two sets of limiting assemblies, each of the limiting assemblies comprising a sliding rod, a pulling block, a limiting spring, an abutting block and a clamping sleeve, the second sleeve being provided with an abutting groove, the abutting block being fitted with the abutting groove, the clamping sleeve being fixedly connected with the abutting block, the first sleeve being provided with a recess, the limiting spring being arranged in the recess, the clamping sleeve being further fixedly connected with the limiting spring, the sliding rod being fixedly connected with the clamping sleeve and the pulling block at two ends thereof and being inserted into the recess, and the sliding rod being in sliding connection with the first sleeve. The limiting assembly further comprises an extrusion arc block, the extrusion arc block being fixedly connected with the clamping sleeve and located on the outer sidewall of the clamping sleeve. The limiting assembly further comprises a protective cover, the protective cover being detachably connected with the first sleeve and located outside the pulling block. The double-layer combined coring drill pipe for offshore drilling further comprises a positioning assembly, the positioning assembly being arranged in the first sleeve. The positioning assembly comprises a guide tube, two guide rails and a plurality of guide wheels, the guide tube being fixedly connected with the first sleeve and located on the outer sidewall of the first sleeve, the two guide rails being symmetrically arranged in the first sleeve, and a plurality of the guide wheels being arranged on each of the guide rails. The positioning assembly further comprises a smooth gasket, the smooth gasket being fixedly connected with the guide tube and located on the inner wall of the guide tube.

2. The double-layer combined coring drill pipe for offshore drilling according to claim 1, characterized in that the limiting assembly further comprises a rubber pad, the rubber pad being fixedly connected with the clamping sleeve and located on the inner wall of the clamping sleeve. ​ ​

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