A forward and reverse circulation coring device and method suitable for a top drive device

Abstract

The present invention discloses a forward and reverse circulation coring device and method suitable for a top drive device, specifically relating to the technical field of drilling equipment, including a dual-channel gooseneck, a control valve and a guide cone. The dual-channel gooseneck includes a rope coring straight pipe and a grouting and slag discharge gooseneck. The grouting and slag discharge gooseneck is fixedly connected to and communicated with the side wall of the rope coring straight pipe. The rope coring straight pipe is used to be fixedly connected to the top drive device. The end of the grouting and slag discharge gooseneck away from the rope coring straight pipe is used to be connected and communicated with a grouting hose or a slag discharge pipeline; the control valve can be detachably connected to the end of the rope coring straight pipe away from the top drive device; the guide cone can be detachably connected to the end of the control valve away from the rope coring straight pipe. The present invention has a simple structure and is easy to operate. It can realize the rope coring process and the gas lift reverse circulation continuous coring process on the same top drive device, thereby improving the efficiency of the coring work.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and in particular to a forward and reverse circulation coring device and method suitable for a top drive device. Background Art

[0002] When conducting wireline coring drilling operations with conventional top drives, the top drive only has a mud circulation channel and no through-channel for deploying drill tools. Therefore, when deploying or recovering the wireline coring tool assembly into the hole, the top drive must be disconnected from the drill pipe and the wireline coring process must be performed from the rig wellhead. This increases the complexity and risk of the operation, and the system lacks mud circulation capabilities when lowering and recovering the drill tools. Furthermore, during continuous coring operations using gas lift, the single-channel gooseneck on the top drive is easily damaged, making it difficult to obtain large cores. Top drives are only suitable for a single coring process and cannot meet the coring requirements of deep well drilling in complex formations. To meet the needs of deep well coring drilling, top drives must meet both the positive circulation mud process of wireline coring and the reverse circulation process of continuous coring while drilling. Summary of the Invention

[0003] The purpose of the present invention is to provide a forward and reverse circulation coring device and method suitable for a top drive device to solve the problems existing in the above-mentioned prior art. The device and method have a simple structure and are easy to operate. The device and method can realize the rope coring process and the gas lift reverse circulation continuous coring process on the same top drive device, thereby improving work efficiency.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a forward and reverse circulation coring device suitable for a top drive device, comprising: a dual-channel gooseneck pipe, the dual-channel gooseneck pipe comprising a rope coring straight pipe and a grouting and slag discharge gooseneck pipe, the grouting and slag discharge gooseneck pipe being fixedly connected to and communicated with the side wall of the rope coring straight pipe, the rope coring straight pipe being used for being fixedly connected to the top drive device, and the end of the grouting and slag discharge gooseneck pipe away from the rope coring straight pipe being used for being connected to and communicated with a grouting hose or a slag discharge pipeline; a control valve, the control valve being detachably connected to the end of the rope coring straight pipe away from the top drive device; and a guide cone, the guide cone being detachably connected to the end of the control valve away from the rope coring straight pipe.

[0006] Preferably, the rope coring straight pipe is connected to the top drive device through a flange.

[0007] Preferably, the rope coring straight pipe is connected to the control valve via a flange, and a seal is provided between the rope coring straight pipe and the control valve.

[0008] Preferably, the grouting and slag discharge gooseneck pipe is connected to the grouting hose or the slag discharge pipeline through a union interface.

[0009] Preferably, the control valve is an electric ball valve.

[0010] Preferably, a reverse circulation plug is further included, which is detachably connected to the end of the rope coring straight pipe away from the top drive device, and a seal is provided between the rope coring straight pipe and the reverse circulation plug, and the reverse circulation plug seals the end of the rope coring straight pipe away from the top drive device.

[0011] The present invention further provides a forward and reverse circulation coring method based on the forward and reverse circulation coring device applicable to a top drive device, comprising the following steps:

[0012] Step 1: During positive circulation wireline coring drilling, the end of the grouting and deslagging gooseneck pipe away from the wireline coring straight pipe is used to connect and communicate with the grouting hose. During the second drilling, the wireline coring drill inner assembly has been placed inside the wireline coring drill outer assembly at the bottom of the hole. The control valve is closed. At this time, the channel of the wireline coring straight pipe is closed, and the high-pressure mud pump injects high-pressure mud into the drill tool in the hole through the channel of the grouting and deslagging gooseneck pipe to realize positive circulation mud drilling and coring;

[0013] Step 2: When the core needs to be salvaged after the drilling is completed, the high-pressure mud pump is turned off and the control valve is opened. At this time, the channel of the rope coring straight tube is open, and a salvage device is lowered to the bottom of the hole through the channel of the rope coring straight tube, and the core tube filled with the core is lifted out from the upper end of the top drive;

[0014] Step three, when gas lift reverse circulation continuous coring is performed, the end of the grouting and slag discharge gooseneck pipe away from the rope coring straight pipe is used to connect and communicate with the slag discharge pipeline, and the control valve is closed. At this time, the channel of the rope coring straight pipe is in a closed state, and the gas-liquid-solid three-phase flow returns to the sample processing equipment from the channel of the grouting and slag discharge gooseneck pipe.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The present invention provides a positive and negative circulation coring device and method suitable for a top drive device. A rope coring straight pipe is fixedly connected to the top drive device. A control valve and a guide cone are installed on the rope coring straight pipe, which can realize the extraction of a fishing device and a core pipe at the upper end of the top drive device. When the rope coring drilling process is carried out, a grouting and slag discharge gooseneck pipe is connected to a grouting hose, the control valve is closed, and a high-pressure mud pump injects high-pressure mud into the drill tool in the hole through the channel of the grouting and slag discharge gooseneck pipe to realize mud positive circulation drilling and coring. When it is necessary to salvage the core, the high-pressure mud pump is closed, the control valve is opened, and the mud is pumped into the hole through the channel of the rope coring straight pipe. The core tube filled with cores is lifted out from the upper end of the top drive; when gas lift reverse circulation continuous coring is performed, the grouting and slag discharge gooseneck is connected and communicated with the slag discharge pipeline, the control valve is closed, and the gas-liquid-solid three-phase flow in the hole is returned to the sample processing equipment through the channel of the grouting and slag discharge gooseneck; the forward and reverse circulation coring device suitable for the top drive device meets both the forward circulation mud process of rope coring and the reverse circulation process of continuous coring while drilling. The dual-channel gooseneck has a simple structure and can simultaneously have mud circulation capabilities when lowering and salvaging drill tools. There is no need to frequently dismantle the top drive device, which is easy to operate and can improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the control valve and the pilot cone installed on the rope coring straight pipe;

[0019] Figure 2 This is a structural diagram of the reverse circulation plug installed on the rope coring straight pipe.

[0020] In the figure: 1-dual-channel gooseneck; 2-rope coring straight pipe; 3-grouting and slag discharge gooseneck; 4-control valve; 5-pilot cone; 6-union interface; 7-reverse circulation plug; 8-seal; 9-rope coring channel. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a forward and reverse circulation coring device and method suitable for a top drive device to solve the problems existing in the above-mentioned prior art. The device and method have a simple structure and are easy to operate. The device and method can realize the rope coring process and the gas lift reverse circulation continuous coring process on the same top drive device, thereby improving work efficiency.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] This embodiment provides a forward and reverse circulation coring device suitable for a top drive device, such as Figure 1 As shown, it includes: a dual-channel gooseneck pipe 1, the dual-channel gooseneck pipe 1 includes a rope coring straight pipe 2 and a grouting and slag discharge gooseneck pipe 3, the grouting and slag discharge gooseneck pipe 3 is fixedly connected to and communicated with the side wall of the rope coring straight pipe 2, the rope coring straight pipe 2 is used to be fixedly connected to the top drive device, and the end of the grouting and slag discharge gooseneck pipe 3 away from the rope coring straight pipe 2 is used to be connected and communicated with the grouting hose or the slag discharge pipeline; a control valve 4, the control valve 4 can be disassembled and connected to the end of the rope coring straight pipe 2 away from the top drive device; the guide cone 5, the guide cone 5 can be disassembled and connected to the end of the control valve 4 away from the rope coring straight pipe 2. The rope coring straight pipe 2 is fixedly connected to the top drive device. The control valve 4 and the guide cone 5 installed on the rope coring straight pipe 2 can realize the extraction of the salvage device and the core tube at the upper end of the top drive device. When the rope coring drilling process is carried out, the grouting and slag discharge gooseneck pipe 3 is connected to the grouting hose, the control valve 4 is closed, and the high-pressure mud pump injects high-pressure mud into the drill bit in the hole through the channel of the grouting and slag discharge gooseneck pipe 3 to realize the positive circulation of mud; when the core needs to be salvaged, the high-pressure mud pump is closed, the control valve 4 is opened, and the core tube filled with the core is raised from the upper end of the top drive through the channel of the rope coring straight pipe 2; when gas lift reverse circulation continuous coring is carried out, the grouting and slag discharge gooseneck pipe 3 is connected and communicated with the slag discharge pipeline, the control valve 4 is closed, and the gas-liquid-solid three-phase flow in the hole is returned to the sample processing equipment from the channel of the grouting and slag discharge gooseneck pipe 3. Without changing the main structure of the top drive device, the forward and reverse circulation coring device suitable for the top drive device can meet both the forward circulation mud process of rope coring and the reverse circulation process of continuous coring while drilling. The dual-channel gooseneck pipe 1 has a simple structure, is easy to maintain and repair, and saves costs. It can have mud circulation capabilities when lowering and salvaging drill tools, does not require frequent dismantling of the top drive device, is easy to operate, reduces operating steps and time, and improves work efficiency.

[0026] It is further preferred in the implementation manner of this embodiment that the rope coring straight pipe 2 is connected to the top drive device through a flange, which is convenient for disassembly and installation.

[0027] It is further preferred in the implementation of this embodiment that the rope coring straight pipe 2 is connected to the control valve 4 through a flange, which is convenient for disassembly and installation, and a seal 8 is provided between the rope coring straight pipe 2 and the control valve 4 to enhance the sealing performance.

[0028] It is further preferred in the implementation manner of this embodiment that the grouting and slag discharge gooseneck pipe 3 is connected to the grouting hose or the slag discharge pipeline through the union interface 6.

[0029] It is further preferred in the implementation of this embodiment that the control valve 4 is an electric ball valve, which can be remotely operated, reducing manual operation by personnel and improving the high-altitude safety of rope coring drilling operations.

[0030] It is further preferred in the implementation manner of this embodiment that Figure 2 As shown, the forward and reverse circulation coring device suitable for the top drive device also includes a reverse circulation plug 7, which is detachably connected to the end of the rope coring straight pipe 2 away from the top drive device, and a sealing member 8 is provided between the rope coring straight pipe 2 and the reverse circulation plug 7. The reverse circulation plug 7 seals the end of the rope coring straight pipe 2 away from the top drive device. When performing gas lift reverse circulation continuous coring, the upward-returning gas-liquid-solid three-phase fluid contains a large amount of core and rock cutting particles, and the flow rate is fast. The control valve 4 is removed from the rope coring straight pipe 2, and the end of the rope coring straight pipe 2 away from the top drive device is sealed by the reverse circulation plug 7. At this time, there is only one channel inside the dual-channel gooseneck pipe 1, which can reduce the damage of the core and rock cutting particles to the control valve 4 and extend the service life of the dual-channel gooseneck pipe 1 structure.

[0031] Example 2

[0032] This embodiment provides a forward and reverse circulation coring method for a forward and reverse circulation coring device applicable to a top drive device based on embodiment 1, comprising the following steps:

[0033] Step 1: When positive circulation wireline coring drilling is performed, the end of the grouting and deslagging gooseneck pipe 3 away from the wireline coring straight pipe 2 is used to connect and communicate with the grouting hose. The central through hole of the wireline coring straight pipe 2, the control valve 4 and the pilot cone 5 are integrated into a wireline coring channel 9. During the return drilling, the wireline coring drill tool inner assembly has been placed inside the wireline coring drill tool outer assembly at the bottom of the hole. The control valve 4 is closed. At this time, the wireline coring channel 9 is in a closed state. The high-pressure mud pump injects high-pressure mud into the drill tool in the hole through the channel of the grouting and deslagging gooseneck pipe 3 to realize positive circulation mud drilling and coring;

[0034] Step 2: When the core needs to be salvaged after the drilling is completed, the high-pressure mud pump is turned off and the control valve 4 is opened. At this time, the rope coring channel 9 is open, and the salvage device is lowered to the bottom of the hole through the channel of the rope coring straight tube 2. The core tube filled with cores is lifted out from the top end of the top drive;

[0035] Step three, when gas lift reverse circulation continuous coring is performed, directly close the control valve 4, or remove the control valve 4 and the guide cone 5 from the rope coring straight pipe 2, and connect the reverse circulation plug 7 to the rope coring straight pipe 2 through a flange. The end of the grouting and slag discharge gooseneck pipe 3 away from the rope coring straight pipe 2 is used to connect and communicate with the slag discharge pipeline. At this time, there is only one channel connected to the slag discharge pipeline inside the dual-channel gooseneck pipe 1, and the gas-liquid-solid three-phase flow returns to the sample processing equipment from the channel of the grouting and slag discharge gooseneck pipe 3.

[0036] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A forward and reverse circulation coring method for a forward and reverse circulation coring device of a top drive device, characterized by: A forward and reverse circulation coring device suitable for a top drive device is used, the forward and reverse circulation coring device suitable for a top drive device comprises a dual-channel gooseneck, a control valve and a pilot cone, the dual-channel gooseneck comprises a rope coring straight pipe and a grouting and slag discharge gooseneck, the grouting and slag discharge gooseneck is fixedly connected to and communicated with the side wall of the rope coring straight pipe, the rope coring straight pipe is used to be fixedly connected to the top drive device, the end of the grouting and slag discharge gooseneck away from the rope coring straight pipe is used to be connected and communicated with a grouting hose or a slag discharge pipeline; the control valve can be detachably connected to the end of the rope coring straight pipe away from the top drive device; the pilot cone can be detachably connected to the end of the control valve away from the rope coring straight pipe; The following steps are also included: Step 1: During positive circulation wireline coring drilling, the end of the grouting and deslagging gooseneck pipe away from the wireline coring straight pipe is used to connect and communicate with the grouting hose. During the second drilling, the wireline coring drill inner assembly has been placed inside the wireline coring drill outer assembly at the bottom of the hole. The control valve is closed. At this time, the channel of the wireline coring straight pipe is closed, and the high-pressure mud pump injects high-pressure mud into the drill tool in the hole through the channel of the grouting and deslagging gooseneck pipe to realize positive circulation mud drilling and coring; Step 2: When the core needs to be salvaged after the drilling is completed, the high-pressure mud pump is turned off and the control valve is opened. At this time, the channel of the rope coring straight tube is open, and a salvage device is lowered to the bottom of the hole through the channel of the rope coring straight tube, and the core tube filled with the core is lifted out from the upper end of the top drive; Step three, when gas lift reverse circulation continuous coring is performed, the end of the grouting and slag discharge gooseneck pipe away from the rope coring straight pipe is used to connect and communicate with the slag discharge pipeline, and the control valve is closed. At this time, the channel of the rope coring straight pipe is in a closed state, and the gas-liquid-solid three-phase flow returns to the sample processing equipment from the channel of the grouting and slag discharge gooseneck pipe.

2. The forward and reverse circulation coring method of the forward and reverse circulation coring device for a top drive device according to claim 1, characterized in that: The rope coring straight pipe is connected to the top drive device through a flange.

3. The forward and reverse circulation coring method of the forward and reverse circulation coring device for a top drive device according to claim 1, characterized in that: The rope coring straight pipe is connected to the control valve through a flange, and a sealing member is provided between the rope coring straight pipe and the control valve.

4. The forward and reverse circulation coring method of the forward and reverse circulation coring device for a top drive device according to claim 1, characterized in that: The grouting and slag discharge gooseneck pipe is connected to the grouting hose or the slag discharge pipeline through a union interface.

5. The forward and reverse circulation coring device suitable for a top drive device according to claim 1, characterized in that: The control valve is an electric ball valve.

6. The forward and reverse circulation coring method of the forward and reverse circulation coring device for a top drive device according to claim 1, characterized in that: It also includes a reverse circulation plug, which is detachably connected to the end of the rope coring straight pipe away from the top drive device, and a seal is provided between the rope coring straight pipe and the reverse circulation plug, and the reverse circulation plug seals the end of the rope coring straight pipe away from the top drive device.

Images