CN-116591630-B - Chip removing structure of pressure maintaining corer and using method thereof

CN116591630BCN 116591630 BCN116591630 BCN 116591630BCN-116591630-B

Abstract

The application relates to a chip removing structure of a pressure maintaining corer and a use method thereof, wherein the chip removing structure comprises an outer pipe, a pressure maintaining controller, a core barrel and a stroke increasing sleeve for scraping off coal chips on the outer wall of the core barrel; the inner walls of the first section and the second section are provided with a plurality of annular grooves along the axial direction, and the annular grooves are used for storing coal dust. In the process of lifting the core pipe upwards, the stroke-increasing sleeve can remove coal dust on the outer wall of the core pipe, meanwhile, the stroke of the falling coal dust can be increased, and a falling space is reserved for the coal dust part which is easy to fall off, so that the falling of the coal dust at the pressure maintaining controller is reduced, the coal dust is prevented from entering the sealing surface of the valve cover and the valve seat of the pressure maintaining controller, the problem of incomplete closure caused by impurity particles of the sealing surface is solved, and the closure stability of the pressure maintaining controller is improved.

Inventors

WANG JUNHONG
WANG TIANYU
ZHANG LU
XIE HEPING
ZHANG FEI
GAO MINGZHONG
GUO CHAOWEI
CUI PENGFEI
ZHAO XUELIANG
LI JU
ZHU PENGFEI

Assignees

晋城蓝焰煤业股份有限公司成庄矿
山西晋煤集团技术研究院有限责任公司
深圳大学
四川大学

Dates

Publication Date: 20260505
Application Date: 20230605

Claims (3)

1. The chip removing structure of the pressure maintaining corer is characterized by comprising the following components: An outer tube; The pressure maintaining controller is arranged in the outer tube and comprises a valve seat (3) and a valve cover (4), and a sealing surface matched with the valve cover (4) is arranged at the top of the valve seat (3); The valve cover (4) is opened and positioned in an annulus between the core tube (5) and the outer tube when the core tube (5) is positioned in the valve seat (3), and the valve cover (4) and the valve seat (3) are closed when the core tube (5) is lifted to a certain height; A stroke-increasing sleeve (6) for scraping off coal dust on the outer wall of the core tube (5), wherein the stroke-increasing sleeve (6) comprises a first section (61) and a second section (62), the outer diameter of the first section (61) is larger than that of the second section (62), the first section (61) is arranged in the outer tube and positioned below the valve seat (3), the second section (62) is operatively inserted into the valve seat (3), and the upper end face of the stroke-increasing sleeve (6) can exceed the sealing face of the valve seat (3); a plurality of annular grooves (63) are formed in the inner walls of the first section (61) and the second section (62) along the axial direction, and the annular grooves (63) are used for storing coal dust; the cross section of the annular groove (63) is a trapezoid groove with a reduced opening; The inner wall of the stroke-increasing sleeve (6) which is used for being contacted with the core tube (5) is provided with a rubber ring (8); A spring (7) for providing axial elastic force is arranged between the outer tube and the stroke-increasing sleeve (6), and the spring (7) is used for pushing the stroke-increasing sleeve (6) in a direction away from the valve seat (3); when the core tube (5) is positioned in the stroke-increasing sleeve (6), the stroke-increasing sleeve (6) and the core tube (5) are kept relatively static by virtue of friction force between the two, and the spring (7) is compressed between the outer tube and the stroke-increasing sleeve (6); The outer tube comprises a first outer tube (1) and a second outer tube (2), the upper end of the first outer tube (1) is connected with the lower end of the second outer tube (2), the pressure maintaining controller is arranged in the second outer tube (2), and the stroke-increasing sleeve (6) is arranged in the first outer tube (1); The upper end of the first outer tube (1) is provided with an inner step (11), the lower end of the valve seat (3) is propped against the inner step (11), and the upper end of the spring (7) is propped against the inner step (11); An outer step (64) is formed at the joint of the first section (61) and the second section (62), and when the core barrel (5) is positioned in the stroke-increasing sleeve (6), the spring (7) is compressed between the inner step (11) of the first outer tube (1) and the outer step (64) of the stroke-increasing sleeve (6); permanent magnets (31) are arranged on the valve seat (3) and the valve cover (4).
2. The chip removing structure of the pressure maintaining corer as set forth in claim 1, wherein the first section (61) and the second section (62) have the same inner diameter.
3. The use method of the chip removing structure of the pressure maintaining corer as claimed in claim 1 or 2, which is characterized by comprising the following steps: In an initial state, the core barrel (5) is matched with the spring (7) and the core barrel (5) through the stroke-increasing sleeve (6) and the inner hole of the valve seat (3), the spring (7) is in a compression state, the friction force of the stroke-increasing sleeve (6) and the core barrel (5) resists the elasticity of the spring (7), the stroke-increasing sleeve (6), the outer pipe and the core barrel (5) are kept relatively static, the upper end face of the stroke-increasing sleeve (6) exceeds the sealing face of the valve seat (3), and the valve cover (4) is opened and positioned in the annular space of the core barrel (5) and the outer pipe; Under the working state, the corer finishes coal sample collection, the core barrel (5) moves upwards under the action of external force, the stroke-increasing sleeve (6) starts to remove scraps, and the scraps fall into the lower end of the stroke-increasing sleeve (6) and the inner space of the outer pipe in a large amount, after the lower end of the core barrel (5) enters the stroke-increasing sleeve (6), the friction force of the stroke-increasing sleeve (6) continuously scrapes the scraps on the outer wall of the core barrel (5), and at the moment, the scraps falling out of the core barrel (5) fall into an annular groove (63) of the stroke-increasing sleeve (6); The core barrel (5) continues to move upwards, after the lower end of the core barrel (5) passes through the upper end of the stroke-increasing sleeve (6), the lower end of the core barrel (5) also passes through the valve seat (3), the friction force given by the core barrel (5) received by the stroke-increasing sleeve (6) disappears, the stroke-increasing sleeve (6) moves downwards under the action of the elasticity of the spring (7), and the coal dust accumulated below the stroke-increasing sleeve (6) is removed; The core tube (5) continues to move upwards, and the valve cover (4) is closed.

Description

Chip removing structure of pressure maintaining corer and using method thereof Technical Field The invention relates to the technical field of pressure maintaining corers, in particular to a chip removing structure of a pressure maintaining corer and a using method thereof. Background The pressure-maintaining gas-maintaining corer is a gas coal sample collection device with a pressure-maintaining function. The main working mode is that the pressure-maintaining gas is filled into the external drilling tool, the drilling is continued for 300mm on the working surface, and then the corer and the external drilling tool are lifted. Then the hydraulic driven spearhead is used for acting on the central rod and indirectly lifting the core barrel, the pressure maintaining controller is closed, the core barrel is then in a closed pressure maintaining environment, and the core barrel is transported to a lifting well and sent to a testing process. One chinese patent publication with publication number CN109458147a discloses a coring device, which comprises a coring drilling tool, a core catcher, a core barrel, a drill outer barrel, a flap valve and an inner rod for lifting the core barrel, wherein the lower end of the inner rod extends into the core barrel and can axially move a certain distance relative to the core barrel, the flap valve comprises a valve seat and a sealing valve cover, the valve seat is coaxially arranged on the inner wall of the drill outer barrel, one end of the sealing valve cover is movably connected with the outer side wall of the upper end of the valve seat, when the core barrel is positioned in the valve seat, the sealing valve cover is opened by 90 degrees, and when the core barrel is lifted up to a certain height by the inner rod, the sealing valve cover returns to the top surface of the valve seat to be in sealing contact with the valve seat. However, in the working process, coal dust is attached to the core barrel, and in the upward lifting process of the core barrel, the coal dust possibly falls on the sealing surface of the valve seat, so that the sealing performance of the pressure maintaining controller is adversely affected, and the pressure maintaining performance of the coring equipment is further affected. Disclosure of Invention The application provides a chip removing structure of a pressure maintaining corer and a using method thereof for solving the technical problems. The application is realized by the following technical scheme: The application provides a chip removing structure of a pressure maintaining corer, which comprises an outer pipe, a pressure maintaining controller, a core barrel and a stroke increasing sleeve, wherein the pressure maintaining controller and the stroke increasing sleeve are arranged in the outer pipe, the pressure maintaining controller comprises a valve seat and a valve cover, a sealing surface matched with the valve cover is arranged at the top of the valve seat, the core barrel can pass through the valve seat and the stroke increasing sleeve, when the core barrel is positioned in the valve seat, the valve cover is opened and positioned in an annulus between the core barrel and the outer pipe, when the core barrel is lifted to a certain height, the valve cover and the valve seat are closed, the stroke increasing sleeve is used for scraping off coal chips on the outer wall of the core barrel, the stroke increasing sleeve comprises a first section and a second section, the outer diameter of the first section is larger than that of the second section, the first section is arranged in the outer pipe and positioned below the valve seat, the second section is operatively inserted into the valve seat, the upper end surface of the stroke increasing sleeve can exceed the sealing surface of the valve seat, and a plurality of annular grooves are formed in the axial directions of the inner walls of the first section and the second section and the annular grooves are used for storing the coal chips. In particular, the inner diameters of the first and second sections are equal. In particular, the cross section of the annular groove is a trapezoid groove with a reduced opening. Optionally, a rubber ring is arranged on the inner wall of the stroke-increasing sleeve, which is used for contacting with the core barrel. The rock core pipe is positioned in the stroke-increasing sleeve, the stroke-increasing sleeve and the rock core pipe are kept relatively static by virtue of friction force between the rock core pipe and the outer pipe, and the spring is compressed between the outer pipe and the stroke-increasing sleeve. In particular, the outer tube includes first outer tube and second outer tube, and first outer tube upper end is connected with second outer tube lower extreme, pressurize controller installs in the second outer tube, and the stroke-increasing sleeve pipe is installed in first outer tube. Optionally, the upper end of the first outer tube is provided wi