Coiled tubing and center rod connection device for pressure-maintaining and gas-maintaining core drill and core drill

Abstract

The present invention discloses a connecting device between a continuous tubing and a center rod of a pressure-maintaining and gas-maintaining coring device and a coring device, wherein the connecting device is arranged inside an outer tube, and the connecting device comprises a continuous tubing joint, a connecting portion and a center rod joint which are sequentially arranged along the axial direction of the outer tube; wherein the first end of the continuous tubing joint is fixedly connected to the continuous tubing, and the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion; the first end of the center rod joint is fixedly connected to the center rod, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion. Since the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion, the rigid deformation of the center rod caused by the rigid connection between the continuous tubing and the center rod is avoided, thereby realizing the protection of the core and the parts of the coring device during the coring process.

Description

Technical Field

[0001] The invention relates to the field of coring, and in particular to a pressure-maintaining and gas-maintaining coring device coiled tubing and center rod connecting device and a coring device. Background Art

[0002] The main component of coal mine gas is methane, and it also contains a certain amount of nitrogen, oxygen, water, carbon dioxide, etc. Among them, methane is the most valuable. my country is a large country in coal reserves and production, and the reserves of coal mine gas are very rich. Developing and utilizing coal mine gas to provide clean energy for mankind is a basic energy strategy of the country.

[0003] However, there is no mature means of gas development and utilization so far. After the coal core obtained by conventional drilling technology is lifted to the ground, the gas contained in it is almost completely lost. Therefore, pressure-maintaining gas coring equipment has emerged. This equipment mainly uses a pressure-maintaining gas coring device to obtain coal cores from underground coal seams. During the core lifting process, the internal gas is retained by pressure-maintaining technology, and a gas analysis system is added on the surface to connect with the corer to extract the internal gas and measure the gas content, so as to facilitate the evaluation of formation resources.

[0004] However, the pressure-maintaining and gas-maintaining corer is connected to the corer center rod through a rigid continuous oil pipe, which may easily cause disturbance during the coring process and cause rigid deformation of the corer center rod.

[0005] Therefore, the existing technology needs to be improved. Summary of the invention

[0006] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a pressure-maintaining and gas-maintaining corer continuous oil tubing and center rod connecting device and a corer are provided, aiming to solve the technical problem in the prior art that the continuous oil tubing and the center rod of the corer are rigidly connected, resulting in disturbance during the coring process causing rigid deformation of the center rod of the corer.

[0007] In a first aspect, the present application provides a connection device between a coiled tubing and a center rod of a pressure-maintaining gas corer, the connection device comprising a coiled tubing joint, a connection portion, and a center rod joint sequentially arranged along the axial direction of the outer tube;

[0008] Among them, the first end of the continuous oil tubing joint is fixedly connected to the continuous oil tubing, and the second end of the continuous oil tubing joint is flexibly connected to the first end of the connecting part; the first end of the center rod joint is fixedly connected to the center rod, and the second end of the center rod joint is flexibly connected to the second end of the connecting part.

[0009] Furthermore, the second end of the coiled tubing joint is provided with a plurality of first mounting parts, the first end of the connecting part is provided with a plurality of second mounting parts, and the first mounting parts and the second mounting parts at corresponding positions are connected by a first connecting member;

[0010] A plurality of third mounting parts are provided at the second end of the center rod joint, a plurality of fourth mounting parts are provided at the second end of the connecting part, and the third mounting parts and the fourth mounting parts at corresponding positions are connected through a second connecting member.

[0011] Furthermore, the first mounting portion, the second mounting portion, the third mounting portion and the fourth mounting portion are all semi-cylindrical holes, and the first connecting member and the second connecting member are both cylindrical pins;

[0012] Wherein, the semi-cylindrical hole is a blind hole.

[0013] Further, the second end of the continuous tubing joint has a plurality of first recessed portions and a plurality of first raised portions, and the plurality of first recessed portions and the plurality of first raised portions are distributed alternately; the first end of the connecting portion has a plurality of second recessed portions and a plurality of second raised portions, and the plurality of second recessed portions and the plurality of second raised portions are distributed alternately;

[0014] Wherein, the first convex part is arranged correspondingly to the second concave part, and the second convex part is arranged correspondingly to the first concave part;

[0015] The second end of the center rod joint has a plurality of third recessed portions and a plurality of third protrusions, and the plurality of third recessed portions and the plurality of third protrusions are distributed alternately; the second end of the connecting portion has a plurality of fourth recessed portions and a plurality of fourth protrusions, and the plurality of fourth recessed portions and the plurality of fourth protrusions are distributed alternately;

[0016] Wherein, the third convex portion is arranged correspondingly to the fourth concave portion, and the fourth convex portion is arranged correspondingly to the third concave portion.

[0017] Furthermore, the connecting portion includes:

[0018] A plurality of connecting joints are sequentially arranged along the axial direction of the outer cylinder;

[0019] Wherein, two adjacent connection joints are both flexibly connected.

[0020] Further, the first end surface of each of the connecting joints has a plurality of fifth recessed portions and a plurality of fifth raised portions, and the fifth recessed portions and the fifth raised portions are distributed alternately, and the second end surface of each of the connecting joints is provided with a plurality of sixth recessed portions and a plurality of sixth raised portions, and the sixth recessed portions and the sixth raised portions are distributed alternately;

[0021] The fifth protrusion of the connecting joint is arranged at the sixth recessed portion at the corresponding position of the adjacent connecting joint, and the sixth protrusion of the connecting joint is arranged at the fifth recessed portion at the corresponding position of the adjacent connecting joint;

[0022] Wherein, the fifth protrusion of the connecting joint and the sixth recessed portion at the corresponding position of the adjacent connecting joint are both provided with a semi-cylindrical hole, and the two semi-cylindrical holes are connected by a cylindrical pin;

[0023] The sixth protrusion of the connecting joint and the fifth recessed portion at the corresponding position of the adjacent connecting joint are both provided with a semi-cylindrical hole, and the two semi-cylindrical holes are connected by a cylindrical pin.

[0024] Furthermore, there are three connecting joints.

[0025] Furthermore, the connecting device also includes:

[0026] A sleeve, wherein a first end of the sleeve is sleeved on a second end of the continuous tubing joint, and a second end of the sleeve is sleeved on a second end of the center rod joint;

[0027] The outer surface of the second end of the coiled tubing joint is provided with a first tooth-shaped structure, the inner surface of the first end of the sleeve is provided with a second tooth-shaped structure matching the first tooth-shaped structure, and the first tooth-shaped structure and the second tooth-shaped structure are meshed with each other;

[0028] The outer surface of the second end of the center rod joint is provided with a third toothed structure, the inner surface of the second end of the sleeve is provided with a fourth toothed structure matching the third toothed structure, and the third toothed structure and the fourth toothed structure are meshed with each other.

[0029] Furthermore, the sleeve is made of nylon or polyethylene;

[0030] A first fixing ring is sleeved on the outer surface of the first end of the sleeve, and a second fixing ring is sleeved on the outer surface of the second end of the sleeve;

[0031] A first end of the continuous tubing joint is provided with a plurality of protruding teeth in a radial direction, and the plurality of protruding teeth are in clearance fit with the inner surface of the outer cylinder.

[0032] In a second aspect, the present application provides a core remover, which includes a connecting device as described in the above technical solution.

[0033] Beneficial effects: The present invention provides a connecting device between a continuous tubing and a center rod of a pressure-maintaining and gas-maintaining coring device and a coring device, wherein the connecting device is arranged inside an outer tube, and the connecting device comprises a continuous tubing joint, a connecting portion and a center rod joint which are sequentially arranged along the axial direction of the outer tube; wherein the first end of the continuous tubing joint is fixedly connected to the continuous tubing, and the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion; the first end of the center rod joint is fixedly connected to the center rod, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion. Since the first end of the continuous tubing joint is fixedly connected to the continuous tubing, and the first end of the center rod joint is fixedly connected to the center rod, the center rod is not easily deviated; at the same time, the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion, thereby avoiding the deformation of the center rod rigidity caused by the rigid connection between the continuous tubing and the center rod, and realizing the protection of the core and the parts of the coring device during the coring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0035] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0036] Figure 1 This is a first structural schematic diagram of a pressure-maintaining and gas-maintaining core drill according to the present invention;

[0037] Figure 2 It is a second structural schematic diagram of a pressure-maintaining and gas-maintaining core drill of the present invention;

[0038] Figure 3 It is a structural schematic diagram of a connecting part in a pressure-retaining and gas-retaining coring device of the present invention;

[0039] Figure 4 It is a first structural schematic diagram of a coiled tubing joint in a pressure-maintaining and gas-maintaining coring device of the present invention;

[0040] Figure 5 It is a second structural schematic diagram of a coiled tubing joint in a pressure-maintaining and gas-maintaining coring device of the present invention;

[0041] Figure 6 It is a third structural schematic diagram of a coiled tubing joint in a pressure-maintaining and gas-maintaining coring device of the present invention;

[0042] Figure 7 It is a structural schematic diagram of a connecting joint in a pressure-maintaining and gas-maintaining coring device of the present invention;

[0043] Figure 8 It is a first structural schematic diagram of a center rod joint in a pressure-maintaining and gas-maintaining coring device of the present invention;

[0044] Fig. 9 It is a second structural schematic diagram of a center rod joint in a pressure-retaining and gas-retaining coring device of the present invention;

[0045] Fig.10 for Figure 1 A partial enlarged view of the middle A;

[0046] Fig.11 It is a structural schematic diagram of a sleeve in a pressure-retaining and gas-retaining coring device of the present invention;

[0047] Reference numerals:

[0048] 10 outer cylinder; 20 cylindrical pin; 30 semi-cylindrical hole; 100 coiled tubing; 200 coiled tubing joint; 210 first recessed portion; 220 first raised portion; 230 first tooth-shaped structure; 240 convex teeth; 300 connecting portion; 310 connecting joint; 311 fifth recessed portion; 312 fifth raised portion; 313 sixth recessed portion; 314 sixth raised portion; 320 second recessed portion; 330 second raised portion; 340 fourth recessed portion; 350 fourth raised portion; 400 center rod joint; 410 third recessed portion; 420 third raised portion; 430 third tooth-shaped structure; 500 center rod; 600 sleeve; 610 second tooth-shaped structure; 620 fourth tooth-shaped structure; 700 first fixing ring; 800 second fixing ring. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0050] In the description of the application, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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, and therefore cannot be understood as a limitation on the present application.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] In the application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] The existing pressure-retaining and gas-retaining corer is connected to the corer center rod through a rigid continuous oil pipe, which is easy to cause disturbance during the coring process, causing the rigid deformation of the corer center rod, resulting in damage to the corer parts.

[0054] Based on this, on the first aspect, the present application provides a connecting device between a continuous oil pipe and a center rod of a pressure-maintaining gas core drill, wherein the connecting device is arranged inside an outer tube, and is characterized in that the connecting device comprises a continuous oil pipe joint 200, a connecting part 300 and a center rod joint 400 which are arranged in sequence along the axial direction of the outer tube; wherein the first end of the continuous oil pipe joint 200 is fixedly connected to the continuous oil pipe 100, and the second end of the continuous oil pipe joint 200 is flexibly connected to the first end of the connecting part 300; the first end of the center rod joint 400 is fixedly connected to the center rod 500, and the second end of the center rod joint 400 is flexibly connected to the second end of the connecting part 300.

[0055] like Figure 1 As shown, the first end of the coiled tubing joint 200 is fixedly connected to the coiled tubing 100. Preferably, the coiled tubing 100 can be detachably connected to the first end of the coiled tubing joint 200 by threaded connection.

[0056] The first end of the center rod joint 400 is fixedly connected to the center rod 500 . Preferably, the center rod 500 can also be detachably connected to the first end of the center rod joint 400 by threaded connection.

[0057] In this embodiment, since the first end of the continuous tubing joint 200 is fixedly connected to the continuous tubing 100, and the first end of the center rod joint 400 is fixedly connected to the center rod 500, the center rod 500 and the continuous tubing 100 are fixedly fixed radially relative to each other, thereby preventing the center rod 500 from rotating. At the same time, since the second end of the continuous tubing joint 200 is flexibly connected to the first end of the connecting portion 300, and the second end of the center rod joint 400 is flexibly connected to the second end of the connecting portion 300, the connecting device has a certain flexibility, so that the connection between the center rod 500 with low disturbance and the continuous tubing 100 during the coring process has a certain flexibility, thereby preventing the rigidity deformation of the center rod 500.

[0058] On the basis of the above-mentioned embodiments, there are many ways to realize the flexible connection between the second end of the continuous tubing joint 200 and the first end of the connecting part 300, and the flexible connection between the second end of the center rod joint 400 and the second end of the connecting part 300. In a preferred embodiment, the second end of the continuous tubing joint 200 is provided with a plurality of first mounting parts, the first end of the connecting part 300 is provided with a plurality of second mounting parts, and the first mounting parts and the second mounting parts at the corresponding positions are connected by a first connecting member; the second end of the center rod joint 400 is provided with a plurality of third mounting parts, the second end of the connecting part 300 is provided with a plurality of fourth mounting parts, and the third mounting parts and the fourth mounting parts at the corresponding positions are connected by a second connecting member.

[0059] like Figures 1 to 10 As shown, the second end of the coiled tubing joint 200, the second end of the center rod joint 400, the first end of the connecting portion 300 and the second end of the connecting portion 300 are all in annular shape. To ensure the reliability of the flexible connection, the second end of the coiled tubing joint 200 and the first end of the connecting portion 300 have the same diameter, and the second end of the center rod joint 400 and the second end of the connecting portion 300 have the same diameter.

[0060] Preferably, the diameters of the second end of the coiled tubing joint 200 , the second end of the center rod joint 400 , the first end of the connecting portion 300 , and the second end of the connecting portion 300 are all the same.

[0061] Specifically, a plurality of first mounting portions can be evenly arranged at the second end of the continuous tubing joint 200. Similarly, a plurality of second mounting portions can also be evenly arranged at the first end of the connecting portion 300. The first mounting portions and the second mounting portions at corresponding positions are connected via a first connecting member, thereby achieving a flexible connection between the second end of the continuous tubing joint 200 and the first end of the connecting portion 300.

[0062] Since the connection method between the second end of the center rod joint 400 and the second end of the connecting portion 300 is consistent with the connection method between the second end of the coiled tubing joint 200 and the first end of the connecting portion 300, it is not repeated here.

[0063] On the basis of the above embodiment, the first mounting portion, the second mounting portion, the third mounting portion and the fourth mounting portion are all semi-cylindrical holes 30 , and the first connecting member and the second connecting member are both cylindrical pins 20 .

[0064] Specifically, in the method of realizing the flexible connection between the second end of the coiled tubing joint 200 and the first end of the connecting part 300, the semi-cylindrical hole 30 at the end of the second end of the coiled tubing joint 200 cooperates with the semi-cylindrical hole 30 at the end of the first end of the connecting part 300 to form a complete cylindrical hole, and then the cylindrical pin 20 is inserted into the complete cylindrical hole, thereby realizing the flexible connection between the second end of the coiled tubing joint 200 and the first end of the connecting part 300;

[0065] As a similar connection method, the semi-cylindrical hole 30 at the second end of the center rod joint 400 cooperates with the semi-cylindrical hole 30 at the second end of the connecting part 300 to form a complete cylindrical hole, and then a cylindrical pin 20 is inserted into the cylindrical hole to achieve a flexible connection between the second end of the center rod joint 400 and the second end of the connecting part 300.

[0066] In this embodiment, the flexible connection mode of the coiled tubing joint 200, the connecting portion 300 and the center rod joint 400 through the semi-cylindrical hole 30 can avoid the direct rigid connection between the coiled tubing 100 and the center rod 500 on the one hand, and can also prevent the coiled tubing joint 200, the connecting portion 300 and the center rod joint 400 from relative axial movement on the other hand.

[0067] Preferably, in order to achieve a better connection effect between the coiled tubing joint 200, the connecting portion 300 and the center rod joint 400, the semi-cylindrical holes 30 are all blind holes.

[0068] On the basis of the above-mentioned embodiment, the shapes of the second end of the continuous tubing joint 200, the first end of the connecting part 300, the second end of the connecting part 300 and the second end of the center rod joint 400 can be set by those skilled in the art according to actual needs. In a preferred setting, the second end of the continuous tubing joint 200 has a plurality of first recessed portions 210 and a plurality of first raised portions 220, and the plurality of first recessed portions 210 and the plurality of first raised portions 220 are distributed alternately; the first end of the connecting part 300 has a plurality of second recessed portions 320 and a plurality of second raised portions 330, and the plurality of second recessed portions 320 and the plurality of second raised portions 330 are distributed alternately; In the embodiment, the first protrusion 220 is arranged correspondingly to the second recess 320, and the second protrusion 330 is arranged correspondingly to the first recess 210; the second end of the center rod joint 400 has a plurality of third recesses 410 and a plurality of third protrusions 420, and the plurality of third recesses 410 and the plurality of third protrusions 420 are distributed alternately; the second end of the connecting portion 300 has a plurality of fourth recesses 340 and a plurality of fourth protrusions 350, and the plurality of fourth recesses 340 and the plurality of fourth protrusions 350 are distributed alternately; wherein, the third protrusion 420 is arranged correspondingly to the fourth recess 340, and the fourth protrusion 350 is arranged correspondingly to the third recess 410.

[0069] like Figure 4 and Figure 6 As shown, in this embodiment, the second end of the coiled tubing joint 200 has a plurality of first recessed portions 210 and a plurality of first raised portions 220, and the plurality of first recessed portions 210 and the plurality of first raised portions 220 are distributed alternately, that is, the shape of the second end of the coiled tubing joint 200 presents a concave-convex shape, the first raised portion 220 is located at the second recessed portion 320 at a position corresponding to the first end of the connecting portion 300, the first recessed portion 210 is used to place the second raised portion 330 at a position corresponding to the first end of the connecting portion 300, and then the second end of the coiled tubing joint 200 is connected to the first end of the connecting portion 300 through the first raised portion 220, the first recessed portion 210, the second raised portion 330, and the semi-cylindrical hole 30 on the second recessed portion 320.

[0070] In addition, the semi-cylindrical holes 30 are generally uniformly arranged radially along the second end of the coiled tubing joint 200 and uniformly arranged radially along the first end of the connecting portion 300 to ensure the connection position is uniform.

[0071] Since the shape structure of the second end of the center rod joint 400 and the second end of the connecting portion 300 is consistent with the shape structure of the second end of the coiled tubing joint 200 and the first end of the connecting portion 300, they are not described here in detail.

[0072] On the basis of the above-mentioned embodiment, the connection part 300 comprises: a plurality of connection joints 310 sequentially arranged along the axial direction of the outer cylinder 10; wherein, two adjacent connection joints 310 are flexibly connected.

[0073] like Figure 2 and Figure 3 As shown, in order to further avoid the damage to the core and the parts of the core drill caused by rigid deformation, in this embodiment, the connecting part 300 includes a plurality of flexible connecting joints 310.

[0074] Specifically, to achieve better results, the number of the connecting joints 310 should be no less than three.

[0075] Preferably, the structures and shapes of the multiple connection joints 310 are the same to facilitate installation and replacement.

[0076] Furthermore, since the connection joint 310 also needs to be assembled with the second end of the coiled tubing joint 200 and the second end of the center rod joint 400, in order to simplify the assembly process, the connection mode of the adjacent connection joints 310 can be set to be consistent with the connection mode of the first end of the connection part 300 and the second end of the coiled tubing joint 200. Specifically, the first end surface of each of the connection joints 310 has a plurality of fifth recessed portions 311 and a plurality of fifth raised portions 312, and the fifth recessed portions 311 and the fifth raised portions 312 are alternately distributed. The second end surface of each of the connection joints 310 is provided with a plurality of sixth recessed portions 313 and a plurality of sixth raised portions 314, and the sixth recessed portions 313 and the sixth raised portions 314 are alternately distributed.

[0077] like Figure 7 As shown, the fifth protrusion 312 of the connecting joint 310 is arranged on the sixth recessed portion 313 at the corresponding position of the adjacent connecting joint 310, and the sixth protrusion 314 of the connecting joint 310 is arranged on the fifth recessed portion 311 at the corresponding position of the adjacent connecting joint 310; wherein, the fifth protrusion 312 of the connecting joint 310 and the sixth recessed portion 313 at the corresponding position of the adjacent connecting joint 310 are both provided with a semi-cylindrical hole 30, and the two semi-cylindrical holes 30 are connected by a cylindrical pin 20; the sixth protrusion 314 of the connecting joint 310 and the fifth recessed portion 311 at the corresponding position of the adjacent connecting joint 310 are both provided with a semi-cylindrical hole 30, and the two semi-cylindrical holes 30 are connected by a cylindrical pin 20.

[0078] On the basis of the above-mentioned embodiment, the connecting device further includes: a sleeve 600, wherein the first end of the sleeve 600 is sleeved on the second end of the continuous tubing joint 200, and the second end of the sleeve 600 is sleeved on the second end of the center rod joint 400; wherein the second end of the continuous tubing joint 200 is provided with a first tooth-shaped structure 230 on the outer surface, and the first end of the sleeve 600 is provided with a second tooth-shaped structure 610 matched with the first tooth-shaped structure 230 on the inner surface, and the first tooth-shaped structure 230 and the second tooth-shaped structure 610 are meshed with each other; the second end of the center rod joint 400 is provided with a third tooth-shaped structure 430 on the outer surface, and the second end of the sleeve 600 is provided with a fourth tooth-shaped structure 620 matched with the third tooth-shaped structure 430 on the inner surface, and the third tooth-shaped structure 430 and the fourth tooth-shaped structure 620 are meshed with each other.

[0079] like Figure 4 , Figure 8 , Fig.11 As shown, in order to avoid mutual sliding between the center rod joint 400, the connecting part 300 and the continuous tubing joint 200, a sleeve 600 is further provided on the outer surface of the connecting device. Since the outer surface of the second end of the continuous tubing joint 200 is provided with a first tooth-shaped structure 230, the inner surface of the first end of the sleeve 600 is provided with a second tooth-shaped structure 610 matched with the first tooth-shaped structure 230, and the first tooth-shaped structure 230 and the second tooth-shaped structure 610 are meshed with each other; the outer surface of the second end of the center rod joint 400 is provided with a third tooth-shaped structure 430, and the inner surface of the second end of the sleeve 600 is provided with a fourth tooth-shaped structure 620 matched with the third tooth-shaped structure 430, and the third tooth-shaped structure 430 and the fourth tooth-shaped structure 620 are meshed with each other, thereby ensuring the relative radial positions between the center rod joint 400, the continuous tubing joint 200 and each connecting joint 310, and at the same time playing the role of buffering the disturbance of the center rod 500.

[0080] Furthermore, the sleeve 600 is made of nylon or polyethylene to increase its flexibility and avoid damage to the corer structure due to rigid connection.

[0081] On the basis of the above-mentioned embodiment, a first fixing ring 700 is sleeved on the outer surface of the first end of the sleeve 600, and a second fixing ring 800 is sleeved on the outer surface of the second end of the sleeve 600 to ensure that the position of the sleeve 600 will not be offset, thereby playing a role in buffering the disturbance of the center rod 500.

[0082] Furthermore, a plurality of protruding teeth 240 are radially disposed at the first end of the coiled tubing joint 200 , and the plurality of protruding teeth 240 are clearance-matched with the inner surface of the outer cylinder 10 .

[0083] like Figure 5As shown, a plurality of protruding teeth 240 protrude radially from the first end of the continuous tubing joint 200. The plurality of protruding teeth 240 are evenly arranged at the first end of the continuous tubing joint 200, and the plurality of protruding teeth 240 are clearance-matched with the inner surface of the outer cylinder 10 to play a guiding role, thereby further preventing the center rod 500 from being offset.

[0084] As a preferred arrangement, four protruding teeth 240 are provided.

[0085] In a second aspect, the present application provides a core remover, which includes a connecting device as described in the above technical solution.

[0086] Since the core remover is provided with the connecting device described in the above technical solutions, it also has the beneficial effects of any of the above technical solutions. To avoid repeated description, they will not be described one by one here.

[0087] In summary, the present invention provides a connecting device between a continuous tubing and a center rod of a pressure-maintaining and gas-maintaining coring device and a coring device, wherein the connecting device is arranged inside an outer tube, and the connecting device includes a continuous tubing joint, a connecting portion, and a center rod joint, which are sequentially arranged along the axial direction of the outer tube; wherein the first end of the continuous tubing joint is fixedly connected to the continuous tubing, and the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion; the first end of the center rod joint is fixedly connected to the center rod, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion. Since the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion, the rigid deformation of the center rod caused by the rigid connection between the continuous tubing and the center rod is avoided, thereby realizing the protection of the core and the parts of the coring device during the coring process.

[0088] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A connecting device between a coiled tubing and a center rod of a pressure-maintaining gas core drill, the connecting device being arranged inside an outer tube, characterized in that: The connecting device comprises a continuous tubing joint, a connecting portion and a center rod joint which are sequentially arranged along the axial direction of the outer cylinder; The first end of the continuous tubing joint is fixedly connected to the continuous tubing, and the second end of the continuous tubing joint is flexibly connected to the first end of the connecting portion; the first end of the center rod joint is fixedly connected to the center rod, and the second end of the center rod joint is flexibly connected to the second end of the connecting portion; The second end of the coiled tubing joint is provided with a plurality of first mounting parts, the first end of the connecting part is provided with a plurality of second mounting parts, and the first mounting parts and the second mounting parts at corresponding positions are connected by a first connecting member; A plurality of connection joints are sequentially arranged along the axial direction of the outer cylinder, wherein two adjacent connection joints are flexibly connected; The first end surface of each of the connecting joints has a plurality of fifth recessed portions and a plurality of fifth raised portions, and the fifth recessed portions and the fifth raised portions are distributed alternately; the second end surface of each of the connecting joints is provided with a plurality of sixth recessed portions and a plurality of sixth raised portions, and the sixth recessed portions and the sixth raised portions are distributed alternately; The fifth protrusion of the connecting joint is arranged at the sixth recessed portion at a position corresponding to the adjacent connecting joint, and the sixth protrusion of the connecting joint is arranged at the fifth recessed portion at a position corresponding to the adjacent connecting joint; Wherein, the fifth protrusion of the connecting joint and the sixth recessed portion at the corresponding position of the adjacent connecting joint are both provided with a semi-cylindrical hole, and the two semi-cylindrical holes are connected by a cylindrical pin; The sixth protrusion of the connecting joint and the fifth recessed portion at the corresponding position of the adjacent connecting joint are both provided with a semi-cylindrical hole, and the two semi-cylindrical holes are connected by a cylindrical pin.

2. The device for connecting the coiled tubing and the center rod of the pressure-maintaining gas core drill according to claim 1, characterized in that: A plurality of third mounting parts are provided at the second end of the center rod joint, a plurality of fourth mounting parts are provided at the second end of the connecting part, and the third mounting parts and the fourth mounting parts at corresponding positions are connected through a second connecting member.

3. The device for connecting coiled tubing and center rod of a pressure-maintaining gas core drill according to claim 2, characterized in that: The first mounting portion, the second mounting portion, the third mounting portion and the fourth mounting portion are all semi-cylindrical holes, and the first connecting member and the second connecting member are both cylindrical pins; Wherein, the semi-cylindrical hole is a blind hole.

4. The device for connecting coiled tubing and center rod of a pressure-maintaining gas core drill according to claim 3, characterized in that: The second end of the continuous tubing joint has a plurality of first recessed portions and a plurality of first raised portions, and the plurality of first recessed portions and the plurality of first raised portions are distributed alternately; the first end of the connecting portion has a plurality of second recessed portions and a plurality of second raised portions, and the plurality of second recessed portions and the plurality of second raised portions are distributed alternately; Wherein, the first convex portion is arranged correspondingly to the second concave portion, and the second convex portion is arranged correspondingly to the first concave portion; The second end of the center rod joint has a plurality of third recessed portions and a plurality of third protrusions, and the plurality of third recessed portions and the plurality of third protrusions are distributed alternately; the second end of the connecting portion has a plurality of fourth recessed portions and a plurality of fourth protrusions, and the plurality of fourth recessed portions and the plurality of fourth protrusions are distributed alternately; Wherein, the third convex portion is arranged correspondingly to the fourth concave portion, and the fourth convex portion is arranged correspondingly to the third concave portion.

5. The device for connecting coiled tubing and center rod of a pressure-maintaining gas core drill according to claim 1, characterized in that: The connecting joints are provided with three.

6. The device for connecting the coiled tubing and the center rod of a pressure-maintaining gas core drill according to any one of claims 1 to 5, characterized in that: The connecting device also includes: A sleeve, wherein a first end of the sleeve is sleeved on a second end of the continuous tubing joint, and a second end of the sleeve is sleeved on a second end of the center rod joint; The outer surface of the second end of the coiled tubing joint is provided with a first tooth-shaped structure, the inner surface of the first end of the sleeve is provided with a second tooth-shaped structure matching the first tooth-shaped structure, and the first tooth-shaped structure and the second tooth-shaped structure are meshed with each other; The outer surface of the second end of the center rod joint is provided with a third toothed structure, the inner surface of the second end of the sleeve is provided with a fourth toothed structure matching the third toothed structure, and the third toothed structure and the fourth toothed structure are meshed with each other.

7. The device for connecting coiled tubing and center rod of a pressure-maintaining gas core drill according to claim 6, characterized in that: The sleeve is made of nylon or polyethylene; A first fixing ring is sleeved on the outer surface of the first end of the sleeve, and a second fixing ring is sleeved on the outer surface of the second end of the sleeve; A first end of the continuous tubing joint is provided with a plurality of protruding teeth in a radial direction, and the plurality of protruding teeth are in clearance fit with the inner surface of the outer tube.

8. A core remover, characterized in that: The core remover comprises a connection device as claimed in any one of claims 1 to 7.

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