A wire-line coring directional drilling tool bottom sub and drilling method

Abstract

The application discloses a kind of rope coring directional drilling tool well bottom distribution device and drilling method, it is related to rope coring drilling technical field, when shell system structure and shaft system structure separate, shell system structure and shaft system structure can relatively rotate, one end of drill pipe joint is used to connect with drill pipe, the other end of drill pipe joint is threadedly connected with shaft system structure, shell system structure is set on the outside of shaft system structure, there is gap between shell system structure and shaft system structure, friction ring is arranged between shell system structure and shaft system structure, friction ring can realize the connection or separation of shell system structure and shaft system structure, piston cavity is arranged in shaft system structure, piston structure is arranged in piston cavity, piston structure is slidably connected with shaft system structure, piston structure is connected with friction ring, elastic element is sleeved on the outside of shaft system structure, one end of elastic element is abutted with piston structure, the other end of elastic element is abutted with shaft system structure.The application can be driven using ground drilling machine, directional drilling and non-directional drilling are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wire-line coring drilling technology, in particular to a wire-line coring directional drilling tool well bottom distribution device and a drilling method. BACKGROUND

[0002] Energy and resources are the cornerstone of economic development and social progress. With the development of economy and society, the concepts of green exploration and deep exploration are deeply rooted in people's hearts. This year, a new round of strategic action for prospecting has just started, and geological core exploration will certainly usher in a new development opportunity. Directional drilling, multi-hole bottom exploration and other technologies based on directional drilling technology are important supporting process methods for green exploration and deep exploration. At present, geological core exploration is mainly based on wire-line coring drilling, but the combination of directional drilling technology and wire-line coring technology is weak, which seriously affects the application of directional drilling technology in the field of geological core exploration.

[0003] In traditional directional drilling, the upper drill pipe does not rotate, the bit is driven by the downhole power tool such as screw drill and turbine drill, and the lateral force is provided by the bent housing or bent sub, so as to change the drilling trajectory and realize directional drilling. However, this method is mainly used for full drilling, and is almost not used for coring drilling, which is contrary to the purpose of obtaining core by geological core drilling, and the downhole power tool such as screw drill and turbine drill has high requirements for mud pump and surface manifold. Some scholars put the downhole power drill in the wire-line coring tool assembly for directional drilling, but the inner assembly has small outer diameter and has the phenomenon of insufficient power. How to realize directional drilling based on the existing wire-line coring technology and using ground drilling machine driving is a big difficulty. SUMMARY

[0004] The purpose of the present application is to provide a wire-line coring directional drilling tool well bottom distribution device and a drilling method, which can be driven by a ground drilling machine to realize directional drilling and non-directional drilling.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] The application provides a bottom device for a wire-line coring directional drilling tool, which comprises a drill rod joint, a shell system and a shaft system, the shell system and the shaft system can be connected or separated, the shell system and the shaft system can rotate relative to each other when the shell system and the shaft system are separated, one end of the drill rod joint is used for being connected with a drill rod, the other end of the drill rod joint is inserted into the shaft system from one end of the shaft system, the drill rod joint is threadedly connected with the shaft system, the shell system is arranged outside the shaft system, a gap exists between the shell system and the shaft system, a friction ring is arranged between the shell system and the shaft system, the friction ring can realize the connection or separation of the shell system and the shaft system, a piston cavity is arranged in the shaft system, a piston structure is arranged in the piston cavity, the piston structure is slidably connected with the shaft system, the piston structure is connected with the friction ring, an elastic element is arranged outside the shaft system, one end of the elastic element abuts against the piston structure, and the other end of the elastic element abuts against the shaft system.

[0007] Preferably, the piston structure comprises a piston and a connecting rod, the piston is annular, the piston is located in the piston cavity, the connecting rod is connected with one end of the piston, the connecting rod is located in a connecting hole of the shaft system, the piston is connected with the friction ring through the connecting rod, the friction ring and the connecting rod are relatively fixed in axial positions through a fixing nut, and one end of the elastic element abuts against the connecting rod.

[0008] Preferably, sealing rings are arranged between the inner side of the piston and the side wall of the piston cavity and between the outer side of the piston and the other side wall of the piston cavity.

[0009] Preferably, the shell system comprises a friction joint, a sealing cavity shell body, a bearing cavity shell body and a conversion joint which are threadedly connected in sequence, and the friction ring is located in the gap between the friction joint and the shaft system.

[0010] Preferably, the shaft system comprises a distribution joint, a bearing shaft and a double male shaft joint which are threadedly connected in sequence, one end of the distribution joint is threadedly connected with the drill rod joint, the other end of the elastic element abuts against one end of the sealing cavity shell body, and a bearing is arranged between the bearing shaft and the bearing cavity shell body.

[0011] Preferably, the drill rod joint, the shell system and the shaft system are all hollow structures.

[0012] Preferably, the friction ring comprises a friction rubber and a support body, the friction rubber is connected with one end of the support body, the support body is connected with the piston structure, and the friction rubber is located between the shell system structure and the shaft system structure.

[0013] Preferably, the thickness of the friction rubber near one end of the elastic element is greater than the thickness of the friction rubber away from the other end of the elastic element.

[0014] The application also provides a drilling method using the bottom of the well distribution device of the wire-line coring directional drilling tool, comprising the following working conditions:

[0015] In the working condition one, during directional drilling, a normal mud displacement is used, the piston compresses the elastic element under the differential pressure, the piston drives the friction ring to move downward, the friction ring is separated from the shell system structure, the drill rod drives the shaft system structure to rotate, the shell system structure does not rotate, and directional drilling is realized.

[0016] In the working condition two, during non-directional drilling, a small displacement or no displacement is used by the mud pump, the piston drives the friction ring to move upward under the action of the elastic element, the friction ring contacts with the shell system structure and fills and extrudes the gap between the shell system structure and the shaft system structure, the drill rod drives the shaft system structure and the shell system structure to rotate synchronously, and non-directional drilling is realized.

[0017] The application has the following technical effects relative to the prior art:

[0018] The bottom of the well distribution device of the wire-line coring directional drilling tool adopts a double-layer pipe structure, namely, an external shell system structure and an internal shaft system structure. The bottom of the well distribution device of the wire-line coring directional drilling tool can realize distribution of the rotating power transmitted by the upper drill rod under the action of different mud pressures. During directional drilling, the rotating power of the upper drill rod only drives the shaft system structure, the shell system structure does not rotate, a stable tool face is provided, and directional drilling is realized; during non-directional drilling such as reaming, the rotating power of the upper drill rod simultaneously drives the shell system structure and the shaft system structure, and conventional drilling is realized. Thus, directional drilling driven by the surface drilling machine based on the existing wire-line coring technology is realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only show some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0020] Figure 1 Directional drilling schematic diagram of the bottom of the well distribution device of the wire-line coring directional drilling tool;

[0021] Figure 2Non-directional drilling schematic diagram of the rope coring directional drilling tool well bottom sub device of the present application;

[0022] Figure 3 Piston sectional view of the present application;

[0023] Figure 4 Sub device sectional view of the present application;

[0024] Figure 5 Sub device side view of the present application;

[0025] Figure 6 Friction ring sectional view of the present application;

[0026] Figure 7 Friction ring side view of the present application;

[0027] Wherein: 1 is the drill pipe joint; 2 is the sub device; 3 is the sealing ring I; 4 is the piston; 5 is the friction ring; 6 is the fixed nut; 7 is the elastic element; 8 is the friction joint; 9 is the sealing ring II; 10 is the sealing cavity shell; 11 is the bearing shaft; 12 is the bearing cavity shell; 13 is the bearing group; 14 is the conversion joint; 15 is the double male shaft joint; 16 is the piston cavity; 17 is the support body; 18 is the connecting rod; 19 is the sealing groove; 20 is the connecting hole; 21 is the friction rubber. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0029] The present application aims to provide a rope coring directional drilling tool well bottom sub device and drilling method, which can be driven by a ground drilling machine to realize directional drilling and non-directional drilling.

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0031] Embodiment one

[0032] As Figures 1 to 7As shown: the embodiment provides a kind of rope coring directional drilling tool well bottom distribution device, including drill pipe joint 1, shell system structure and shaft system structure, shell system structure is set on the outside of shaft system structure, to adapt to rope coring drilling process, drill pipe joint 1, shell system structure and shaft system structure are hollow structure, the center through-hole of hollow structure is rope coring inner assembly fishing and launching channel, shell system structure and shaft system structure can be connected or separated, when shell system structure and shaft system structure are separated, shell system structure and shaft system structure can relatively rotate;Shell system structure includes friction joint 8, sealing cavity shell body 10, bearing cavity shell body 12 and conversion joint 14 connected in turn;Shaft system structure includes distribution joint 2, bearing shaft 11 and double common shaft joint 15 connected in turn, the upper end of distribution joint 2 is connected with drill pipe joint 1 by screw thread, bearing or bearing group 13 is arranged in the annular cavity formed by bearing shaft 11 and bearing cavity shell body 12, sealing ring II 9 is arranged in the annular cavity formed by friction joint 8, sealing cavity shell body 10 and bearing shaft 11.

[0033] In the embodiment, the upper end of drill pipe joint 1 is used to be connected with drill pipe, the lower end of drill pipe joint 1 is inserted into distribution joint 2 by the upper end of distribution joint 2, drill pipe joint 1 is connected with distribution joint 2 by screw thread, friction ring 5 includes friction rubber 21 and support body 17, friction rubber 21 is annular, the lower end of friction rubber 21 is connected with support body 17, friction rubber 21 is located in the gap between friction joint 8 and distribution joint 2, friction rubber 21 can realize the connection or separation of shell system structure and shaft system structure, piston cavity 16 is arranged in distribution joint 2, piston structure is arranged in piston cavity 16, piston structure is slidably connected with the side wall of piston cavity 16, piston structure includes piston 4 and two symmetrically arranged cylindrical connecting rods 18, piston 4 is annular, piston 4 is located in piston cavity 16, and the inner side of piston 4 and the outer side of piston 4 are both provided with sealing groove 19, sealing ring I 3 is arranged in sealing groove 19, the upper end of connecting rod 18 is connected with the lower end of piston 4, the lower end of connecting rod 18 is sequentially inserted into connecting hole 20 of distribution joint 2 and support body 17, to realize the connection of piston 4 and friction ring 5, support body 17 and connecting rod 18 realize the relative fixation of axial position of friction ring 5 and connecting rod 18 by fixed nut 6, one end of elastic element 7 abuts against connecting rod 18.

[0034] In the embodiment, the thin end of distribution joint 2 is sleeved with elastic element 7, and the elastic element 7 is preferably a compression spring in a compressed state, the upper end of the elastic element 7 abuts against the lower end of the connecting rod 18, and the lower end of the elastic element 7 abuts against the upper end of the bearing shaft 11.

[0035] In the embodiment, the thickness of the friction rubber 21 near one end of the elastic element 7 is greater than the thickness of the friction rubber 21 away from the other end of the elastic element 7. The thickness of the friction rubber 21 is preferably stepped, and the corresponding outer wall of the distribution joint 2 is also stepped.

[0036] In directional drilling, the normal displacement is used, the inner and outer pressure difference of the bottom hole sub-drive device of the wire-line coring directional drilling tool of the embodiment is large, the elastic element 7 is compressed under the action of the pressure difference, the piston 4 structure moves downward as a whole, the friction ring 5 moves downward at the same time, the friction rubber 21 on the friction ring 5 is separated from the friction joint 8, the sub-drive joint 2 is driven by the upper drill pipe at the same time, the remaining structures of the shaft system structure are rotated, the shell system structure does not rotate, and a stable tool face is provided.

[0037] In non-directional drilling such as reaming, the mud pump uses small displacement or no displacement, the inner and outer pressure difference of the bottom hole sub-drive device of the wire-line coring directional drilling tool of the embodiment is small, the piston 4 structure moves upward as a whole under the action of the elastic element 7, the friction ring 5 moves upward at the same time, the friction rubber 21 on the friction ring 5 contacts the friction joint 8, and fills and extrudes the gap between the friction joint 8 and the sub-drive joint 2, the sub-drive joint 2 is driven by the upper drill pipe at the same time, the remaining structures of the shaft system structure are rotated, and the friction joint 8 is rotated through the friction force provided by the friction rubber 21 of the friction ring 5, so that the entire shell system structure and the shaft system structure are rotated synchronously.

[0038] The bottom hole sub-drive device of the wire-line coring directional drilling tool of the embodiment adopts a double-layer pipe structure, that is, the shell system structure outside and the shaft system structure inside. Under the action of different mud pressures, the bottom hole sub-drive device of the wire-line coring directional drilling tool of the embodiment can realize distribution of the rotating power transmitted by the upper drill pipe. In directional drilling, the rotating power of the upper drill pipe only drives the shaft system structure, the shell system structure does not rotate, a stable tool face is provided, and directional drilling is performed; in non-directional drilling such as reaming, the rotating power of the upper drill pipe simultaneously drives the shell system structure and the shaft system structure, and conventional drilling is performed. Thus, directional drilling driven by the surface drilling machine based on the existing wire-line coring technology is realized.

[0039] The bottom hole sub-drive device of the wire-line coring directional drilling tool of the embodiment helps to realize directional (build-up) coring drilling based on the traditional wire-line coring technology, does not have special requirements for the mud pump and the surface pipeline, avoids using the downhole power tool, and the downhole bit is completely driven by the surface drilling machine.

[0040] Embodiment two

[0041] The embodiment provides a drilling method using the bottom hole sub-drive device of the wire-line coring directional drilling tool of embodiment one, including the following working conditions:

[0042] Working condition one, as shown in Figure 1 in directional drilling, the normal mud displacement is used, the elastic element 7 is compressed under the action of the pressure difference, the piston 4 drives the friction ring 5 to move downward, the friction ring 5 is separated from the shell system structure, the drill pipe drives the shaft system structure to rotate, the shell system structure does not rotate, and directional drilling is realized;

[0043] In the second working condition, as shown in the figure, when the non-directional drilling is performed, the mud pump adopts a small displacement or no displacement, the piston 4 drives the friction ring 5 to move upward under the action of the elastic element 7, the friction ring 5 is in contact with the shell system structure and fills the gap between the shell system structure and the shaft system structure, the drill rod driving shaft system structure and the shell system structure rotate synchronously, and the non-directional drilling is realized. Figure 2

[0044] The principles and implementation manners of the present application are described in the specification by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.​

Claims

1. A bottom-hole transfer device for a wireline coring directional drilling tool, characterized in that: The system includes a drill pipe joint, a shell structure, and a shaft structure. The shell structure and the shaft structure can be connected or separated. When separated, the shell structure and the shaft structure can rotate relative to each other. One end of the drill pipe joint is used to connect to the drill pipe, and the other end of the drill pipe joint extends into the shaft structure from one end of the shaft structure. The drill pipe joint is threadedly connected to the shaft structure. The shell structure is sleeved on the outside of the shaft structure, and there is a gap between the shell structure and the shaft structure. A friction ring is provided between the shell structure and the shaft structure, which enables the connection or separation of the shell structure and the shaft structure. A piston cavity is provided in the shaft structure, and a piston structure is provided in the piston cavity. The piston structure is slidably connected to the shaft structure and is connected to the friction ring. An elastic element is sleeved on the outside of the shaft structure, with one end of the elastic element abutting against the piston structure and the other end of the elastic element abutting against the shaft structure. The piston structure includes a piston and a connecting rod. The piston is annular and located in the piston chamber. The connecting rod is connected to one end of the piston and is located in the connecting hole of the shaft structure. The piston and the friction ring are connected through the connecting rod. The friction ring and the connecting rod are relatively fixed in axial position by a fixing nut. One end of the elastic element abuts against the connecting rod. The shell structure includes a friction joint, a sealing cavity shell, a bearing cavity shell, and a conversion joint connected in sequence by threads, and the friction ring is located in the gap between the friction joint and the shaft structure; The shaft system structure includes a transfer joint, a bearing shaft, and a double male shaft joint connected in sequence by threads. One end of the transfer joint is threaded to the drill pipe joint. The transfer joint is provided with a piston chamber. The other end of the elastic element abuts against one end of the sealing cavity housing. A bearing is provided between the bearing shaft and the bearing cavity housing.

2. The bottom-hole transfer device for wireline coring directional drilling tools according to claim 1, characterized in that: A sealing ring is provided between the inner side of the piston and the side wall of the piston cavity, and between the outer side of the piston and the other side wall of the piston cavity.

3. The bottom-hole transfer device for wireline coring directional drilling tools according to claim 1, characterized in that: The drill pipe joint, the shell structure, and the shaft structure are all hollow structures.

4. The bottom-hole transfer device for wireline coring directional drilling tools according to claim 1, characterized in that: The friction ring includes friction rubber and a support body. The friction rubber is connected to one end of the support body, and the support body is connected to the piston structure. The friction rubber is located between the shell structure and the shaft structure.

5. The bottom-hole transfer device for wireline coring directional drilling tools according to claim 4, characterized in that: The thickness of the friction rubber at the end closest to the elastic element is greater than the thickness of the friction rubber at the end furthest from the elastic element.

6. A drilling method using the bottom-hole transfer device of a wireline coring directional drilling tool as described in any one of claims 1-5, characterized in that: Including the following operating conditions: In working condition 1, during directional drilling, the normal mud discharge rate is used. The piston compresses the elastic element under the action of pressure difference. The piston drives the friction ring to move down, the friction ring separates from the shell structure, the drill pipe drives the shaft structure to rotate, and the shell structure does not rotate, thus realizing directional drilling. In the second working condition, during non-directional drilling, the mud pump uses a small or no displacement. Under the action of the elastic element, the piston drives the friction ring to move upward. The friction ring contacts the shell structure and fills the gap between the shell structure and the shaft structure. The drill pipe drives the shaft structure and the shell structure to rotate synchronously, thus realizing non-directional drilling.

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