阅读说明：本技术 一种绳索取心钻具的岩心管单向阀机构 (Core tube one-way valve mechanism of rope coring drilling tool ) 是由 李鑫淼 梁健 刘秀美 孙建华 *** 于 2020-06-17 设计创作，主要内容包括：一种绳索取心钻具的岩心管单向阀机构,包括岩心管接头、推力套、可升降式阀座、圆柱销和钢球；所述岩心管接头设有上下贯通的内孔及与内孔垂直贯通的排液孔,在岩心管接头外面套装推力套,并在岩心管接头的侧壁中部对称设置两个圆柱销避让孔；所述推力套为圆柱状套管,在推力套上配装圆柱销；所述可升降式阀座为下端设有圆锥型收口的套管,置于岩心管接头的内孔中,并可轴向上下运动,在可升降式阀座的侧壁上设置轴向长孔,当可升降式阀座处于下位时,轴向长孔与岩心管接头下部的排液孔贯通；所述钢球放置在可移动式阀座中。本发明通过对各组成零部件结构及其配合关系的优化设计,达到了保证岩心的品质和采取率、提高工作效率的目的。(A core tube one-way valve mechanism of a rope coring drilling tool comprises a core tube joint, a thrust sleeve, a liftable valve seat, a cylindrical pin and a steel ball; the core tube joint is provided with an inner hole which is vertically communicated and a liquid discharge hole which is vertically communicated with the inner hole, a thrust sleeve is sleeved outside the core tube joint, and two cylindrical pin avoiding holes are symmetrically arranged in the middle of the side wall of the core tube joint; the thrust sleeve is a cylindrical sleeve, and a cylindrical pin is assembled on the thrust sleeve; the liftable valve seat is a sleeve with a conical closing-in at the lower end, is arranged in an inner hole of the core tube joint and can axially move up and down, an axial long hole is formed in the side wall of the liftable valve seat, and when the liftable valve seat is at the lower position, the axial long hole is communicated with a liquid discharge hole at the lower part of the core tube joint; the steel ball is placed in the movable valve seat. According to the invention, the aims of ensuring the quality and the sampling rate of the rock core and improving the working efficiency are achieved through the optimized design of the structure of each component and the matching relation of the component.)

1. A core tube one-way valve mechanism of a rope coring drilling tool is characterized by comprising a core tube joint (2), a thrust sleeve (3), a liftable valve seat (5), a cylindrical pin (9) and a steel ball (8); the core tube joint (2) is provided with an inner hole (2-7) which is through up and down and a liquid discharge hole (2-4) which is through vertically with the inner hole, the upper end and the lower end of the core tube joint are respectively assembled with a connecting sleeve (11) of an inner tube assembly of a rope core drill and a core tube (7), a thrust sleeve (3) is sleeved outside the core tube joint (2), and two cylindrical pin avoiding holes (2-2) are symmetrically arranged in the middle of the side wall of the core tube joint (2); the thrust sleeve (3) is a cylindrical sleeve, and a cylindrical pin (9) is assembled on the thrust sleeve; two ends of the cylindrical pin (9) penetrate through cylindrical pin avoiding holes (2-2) of the core pipe joint (2) and then are assembled with pin holes (3-2) formed in the side wall of the thrust sleeve (3); the liftable valve seat (5) is a sleeve with a conical closing-in (5-2) arranged at the lower end, is arranged in an inner hole (2-7) of the core tube joint (2) and can axially move up and down, an axial long hole (5-1) is formed in the side wall of the liftable valve seat (5), and when the liftable valve seat (5) is at the lower position, the axial long hole (5-1) is communicated with a liquid discharge hole (2-4) at the lower part of the core tube joint (2); the steel ball (8) is placed in the movable valve seat (5), and the steel ball (8) is matched with the conical closing-in (5-2) at the lower end of the liftable valve seat (5) to realize a sealing function.

2. The core tube one-way valve mechanism of the rope core drilling tool according to claim 1, characterized in that a liftable valve seat positioning assembly is further arranged, the liftable valve seat positioning assembly comprises a transposition sleeve (4) and an axial slot arranged on the outer wall of the core tube connector, the transposition sleeve (4) is sleeved outside the core tube connector (2) and is positioned below the thrust sleeve (3), and two positioning insertion blocks (4-2) which extend downwards and are matched with the axial slot on the outer wall of the core tube connector are symmetrically arranged on the side wall of the transposition sleeve (4); the axial slots arranged on the outer wall of the core tube joint (2) comprise two groups, wherein one group is a high-position slot (2-3) positioned above the liquid drainage hole (2-4), and the other group is a low-position slot (2-5) forming a 90-degree rotation angle with the high-position slot (2-3).

3. The core tube check valve mechanism of a wireline core drill according to claim 1 or 2, characterized in that it further comprises a liftable seat-resetting and pressing assembly, the liftable seat-resetting and pressing assembly comprising a return spring (10) and a plug (1); the plug (1) is fixed at the upper end of the core tube joint (2); the reset spring (10) is sleeved in an inner hole (2-7) of the core tube joint (2) and is arranged between the bottom surface of the plug (1) and the upper end surface of the liftable valve seat (5) in a pre-compression mode.

4. The core barrel check valve mechanism of a wireline coring drill as set forth in claim 3, wherein a sealing ring groove (2-6) is provided at the bottom of the inner bore (2-7) of the core barrel joint (2), and an elastic sealing ring (6) is installed in the sealing ring groove (2-6).

5. The core tube check valve mechanism of the rope core drilling tool as claimed in claim 4, wherein the upper and lower ends of the core tube joint (2) are respectively assembled with the connecting sleeve (11) of the inner tube assembly of the rope core drilling tool and the core tube (7) through a threaded connection structure, and at least four mounting tool clamping surfaces (2-1) are symmetrically arranged on the outer circumferential surface of the middle part of the core tube joint (2).

6. Core tube check valve mechanism of a wireline coring tool according to claim 4, characterized in that a rectangular gripping groove (3-1) is provided on the outer side wall of the thrust sleeve (3).

7. The core barrel check valve mechanism of a wireline coring drill as set forth in claim 4, wherein an annular grip groove (4-1) is provided on an outer side wall of the transposition sleeve (4).

8. The core barrel check valve mechanism of a wireline core drill according to claim 4, characterized in that the plug (1) is fixedly assembled with the core barrel joint (2) in a threaded connection.

Technical Field

The invention relates to a rope coring drilling tool, in particular to a core tube one-way valve mechanism of the rope coring drilling tool.

Background

The ultra-deep scientific drilling is a scientific exploration activity for developing geological research by coring an ultra-deep hole and recycling the obtained rock core, and a rope coring drilling process is mostly selected for the ultra-deep scientific drilling in order to improve the coring drilling efficiency and the rock core collection quality and reduce the drilling cost.

In the process flow of the rope coring drilling, when a rock core enters a core tube, flushing fluid in the core tube needs to be removed through the one-way valve, and when the inner tube is salvaged, the flushing fluid is prevented from eroding the core in the tube by closing the one-way valve, so that a core tube one-way valve mechanism is arranged in the rope coring drilling tool. In the prior art, a core barrel one-way valve mechanism adopts a mode that a steel ball is matched with a fixed valve seat, the steel ball is pushed to move upwards to be separated from the valve seat along with the entering of a core barrel during the drilling process, the one-way valve is in an open state, and flushing fluid in the core barrel is discharged; when the inner pipe is salvaged, the steel ball falls back to the valve seat under the action of flushing fluid and self gravity, the one-way valve is closed, and the core in the pipe is in a closed pressure maintaining state. Because the inner taper of the valve seat and the steel ball in the core tube one-way valve mechanism is small, when the earth surface is cored, the core is convenient to core, a drilling tool is generally kept at a small inclination angle in the vertical direction, and the steel ball and the fixed ball seat are still in a fit state at the moment, so that negative pressure inside the core tube is caused, the core-out difficulty and the operation time are increased, and the working efficiency is reduced.

Disclosure of Invention

The invention provides a core tube one-way valve mechanism of a rope core drilling tool, aiming at achieving the purposes of ensuring the quality and the sampling rate of a core and improving the working efficiency by optimizing the structure and the matching relation of all components.

In order to achieve the purpose, the invention adopts the following technical scheme:

a core tube one-way valve mechanism of a rope coring drilling tool comprises a core tube joint, a thrust sleeve, a liftable valve seat, a cylindrical pin and a steel ball; the core tube joint is provided with an inner hole which is vertically communicated and a liquid discharge hole which is vertically communicated with the inner hole, the upper end and the lower end of the core tube joint are respectively assembled with a connecting sleeve of an inner tube assembly of the rope core drilling tool and the core tube, a thrust sleeve is sleeved outside the core tube joint, and two cylindrical pin avoiding holes are symmetrically arranged in the middle of the side wall of the core tube joint; the thrust sleeve is a cylindrical sleeve, and a cylindrical pin is assembled on the thrust sleeve; two ends of the cylindrical pin penetrate through the cylindrical pin avoiding hole of the core pipe joint and then are assembled with the pin hole formed in the side wall of the thrust sleeve; the liftable valve seat is a sleeve with a conical closing-in at the lower end, is arranged in an inner hole of the core tube joint and can axially move up and down, an axial long hole is formed in the side wall of the liftable valve seat, and when the liftable valve seat is at the lower position, the axial long hole is communicated with a liquid discharge hole at the lower part of the core tube joint; the steel ball is placed in the movable valve seat, and the steel ball is matched with the conical closing-in at the lower end of the liftable valve seat to realize a sealing function.

The core tube one-way valve mechanism of the rope core drilling tool is also provided with a liftable valve seat positioning assembly, the liftable valve seat positioning assembly comprises a transposition sleeve and an axial slot arranged on the outer wall of a core tube joint, the transposition sleeve is sleeved outside the core tube joint and positioned below a thrust sleeve, and two downward extending positioning insertion blocks matched with the axial slot on the outer wall of the core tube joint are symmetrically arranged on the side wall of the transposition sleeve; the axial slots arranged on the outer wall of the core tube joint comprise two groups, wherein one group is a high-position slot positioned above the liquid discharge hole, and the other group is a low-position slot forming a 90-degree rotation angle with the high-position slot.

The core tube one-way valve mechanism of the rope core drilling tool is also provided with a liftable valve seat resetting and pressing assembly, and the liftable valve seat resetting and pressing assembly comprises a resetting spring and a plug; the plug is fixed at the upper end of the core pipe joint; the reset spring is sleeved in an inner hole of the core pipe joint and is installed between the bottom surface of the plug and the upper end surface of the liftable valve seat in a precompression mode.

The core tube one-way valve mechanism of the rope core drilling tool is characterized in that a sealing ring groove is formed in the bottom of an inner hole of a core tube joint, and an elastic sealing ring is installed in the sealing ring groove.

According to the core tube one-way valve mechanism of the rope core drilling tool, the upper end and the lower end of the core tube connector are respectively assembled with the connecting sleeve of the inner tube assembly of the rope core drilling tool and the core tube through the threaded connecting structure, and at least four mounting tool clamping surfaces are symmetrically arranged on the outer circular surface in the middle of the core tube connector.

According to the core barrel one-way valve mechanism of the rope core drilling tool, the outer side wall of the thrust sleeve is provided with the rectangular holding groove.

According to the core tube one-way valve mechanism of the rope core drilling tool, the outer side wall of the transposition sleeve is provided with the annular holding groove.

According to the core tube one-way valve mechanism of the rope core drilling tool, the plug is fixedly assembled with the core tube connector in a threaded connection mode.

The invention relates to a core tube one-way valve mechanism of a rope core drilling tool, which can control the opening and closing of a one-way valve through the matching of a steel ball and a liftable valve seat and realize the switching of pressure maintaining and pressure releasing functions of a core tube through the position change of the liftable valve seat. In the drilling process of the rope core drilling tool, a cylindrical pin arranged on a thrust sleeve is carried at the bottom of a cylindrical pin avoiding hole of a core pipe joint, two positioning insertion blocks of a transposition sleeve are clamped into two low-position insertion slots of the core pipe joint, a liftable valve seat is in a low position under the action of self, the gravity of a steel ball and the pre-compression force of a reset spring, at the moment, a core pipe is blocked, the steel ball is pushed to move upwards to be separated from the liftable valve seat along with the entry of a core, a one-way valve is opened, and flushing fluid in the core pipe is discharged; when the inner pipe is fished, under the action of flushing fluid and self gravity, the steel ball falls back to the conical closing-in part of the liftable valve seat, the one-way valve is closed, and the core in the pipe is in a closed pressure maintaining state; when the earth surface is cored, an operator can move the thrust sleeve upwards by one hand, the thrust sleeve drives the cylindrical pin to the top of the cylindrical pin avoiding hole, the liftable valve seat is lifted to a high position by the cylindrical pin, the return spring is further compressed, then the other hand pushes the transposition sleeve upwards to separate the two positioning insertion blocks of the transposition sleeve from the two low-position insertion slots of the core pipe joint, then the transposition sleeve is rotated by 90 degrees, two positioning insertion blocks of the transposition sleeve are slid into the high-position insertion slot of the core tube joint, then, the thrust sleeve and the transposition sleeve are respectively loosened by two hands, the thrust sleeve and the liftable valve seat move downwards under the action of the elastic force of the reset spring until the thrust sleeve contacts the transposition sleeve, the upper end of the core tube is in an open state at the moment, a pressure relief channel is opened, negative pressure possibly generated at the upper end of the core tube is eliminated, and the core drilled in the complex stratum is easier to exit the tube. Therefore, the invention achieves the purposes of ensuring the quality and the sampling rate of the rock core and improving the working efficiency by the optimized design of the structure of each component and the matching relation thereof.

Drawings

FIG. 1 is a schematic view of a core barrel check valve mechanism of a wireline core drill according to the present invention;

FIG. 2 is a schematic cross-sectional view of a core barrel joint;

FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 2;

FIG. 4 is a schematic view of the cross-sectional structure B-B in FIG. 2;

FIG. 5 is a schematic cross-sectional view of a thrust sleeve;

FIG. 6 is a schematic view of the cross-sectional structure C-C of FIG. 5;

FIG. 7 is a schematic cross-sectional view of the shift sleeve;

FIG. 8 is a schematic view of the cross-sectional structure of FIG. 7 taken along line D-D;

FIG. 9 is a schematic cross-sectional view of a liftable valve seat;

FIG. 10 is a side view of FIG. 9;

fig. 11 is a schematic view of the present invention during surface coring operations.

The list of labels in the figure is:

1. a plug;

2. 2-1 parts of a core pipe joint, 2-2 parts of a clamping surface of an installation tool, 2-3 parts of a cylindrical pin avoiding hole, 2-4 parts of a high-position slot, 2-5 parts of a drainage hole, 2-6 parts of a low-position slot, 2-7 parts of a sealing ring groove and an inner hole;

3. a thrust sleeve 3-1, a rectangular holding groove 3-2 and a pin hole;

4. a transposition sleeve 4-1, an annular holding groove 4-2 and a positioning insert block;

5. a liftable valve seat, 5-1, an axial long hole, 5-2 and a conical closing-in;

6. an elastic sealing ring;

7. a core barrel;

8. a steel ball;

9. a cylindrical pin;

10. a return spring;

11. a connecting sleeve.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

Referring to fig. 1, 2, 3, 5, 6, 9 and 10, the core tube check valve mechanism of the rope core drill comprises a core tube joint 2, a thrust sleeve 3, a liftable valve seat 5, a cylindrical pin 9 and a steel ball 8; the core pipe joint 2 is provided with an inner hole 2-7 which is vertically communicated and a liquid discharge hole 2-4 which is vertically communicated with the inner hole, the bottom of the inner hole 2-7 of the core pipe joint 2 is provided with a sealing ring groove 2-6, an elastic sealing ring 6 is arranged in the sealing ring groove 2-6, the upper end and the lower end of the core pipe joint 2 are respectively assembled with a connecting sleeve 11 of a rope core drill inner pipe assembly and a core pipe 7 through a threaded connection structure, at least four mounting tool clamping surfaces 2-1 are symmetrically arranged on the outer circumferential surface of the middle part of the core pipe joint 2, a thrust sleeve 3 is sleeved outside the core pipe joint 2, and two cylindrical pin avoiding holes 2-2 are symmetrically arranged in the middle part of the side wall of the core pipe joint 2; the thrust sleeve 3 is a cylindrical sleeve, a cylindrical pin 9 is assembled on the thrust sleeve, and a rectangular holding groove 3-1 is formed in the outer side wall of the thrust sleeve 3; two ends of the cylindrical pin 9 penetrate through the cylindrical pin avoiding hole 2-2 of the core tube joint 2 and then are assembled with the pin hole 3-2 arranged on the side wall of the thrust sleeve 3; the liftable valve seat 5 is a sleeve with a conical closing-in 5-2 at the lower end, is arranged in an inner hole 2-7 of the core tube joint 2 and can axially move up and down, an axial long hole 5-1 is arranged on the side wall of the liftable valve seat 5, and when the liftable valve seat 5 is at the lower position, the axial long hole 5-1 is communicated with a liquid discharge hole 2-4 at the lower part of the core tube joint 2; the steel ball 8 is placed in the movable valve seat 5, and the steel ball 8 is matched with the conical closing-in 5-2 at the lower end of the liftable valve seat 5 to realize a sealing function.

Referring to fig. 1, 2, 3, 4, 7 and 8, the core barrel check valve mechanism of the rope core drilling tool is further provided with a liftable valve seat positioning assembly, the liftable valve seat positioning assembly comprises a transposition sleeve 4 and an axial slot arranged on the outer wall of the core barrel connector 2, the transposition sleeve 4 is sleeved on the outer side of the core barrel connector 2 and is positioned below the thrust sleeve 3, an annular holding groove 4-1 is arranged on the outer side wall of the transposition sleeve 4, and two positioning insertion blocks 4-2 extending downwards and matched with the axial slot on the outer wall of the core barrel connector are symmetrically arranged on the side wall of the transposition sleeve 4; the axial slots arranged on the outer wall of the core tube joint comprise two groups, wherein one group is a high-position slot 2-3 positioned above the liquid discharge hole 2-4, and the other group is a low-position slot 2-5 forming a 90-degree rotation angle with the high-position slot 2-3.

Referring to fig. 1 and 2, the core tube check valve mechanism of the rope core drill further comprises a liftable valve seat resetting and pressing assembly, wherein the liftable valve seat resetting and pressing assembly comprises a resetting spring 10 and a plug 1; the plug 1 is fixed at the upper end of the core tube joint 2 in a threaded connection manner; the return spring 10 is sleeved in an inner hole 2-7 of the core tube joint 2 and is arranged between the bottom surface of the plug 1 and the upper end surface of the liftable valve seat 5 in a precompression mode.

Referring to fig. 1 to 11, the core barrel check valve mechanism of a wireline core drill according to the present invention operates according to the following principle: in the drilling process of the rope core drilling tool, the cylindrical pin 9 arranged on the thrust sleeve 3 is carried at the bottom of a cylindrical pin avoiding hole 2-2 of the core pipe joint 2, two positioning insertion blocks 4-2 of the transposition sleeve 4 are clamped into two low-position insertion grooves 2-5 of the core pipe joint 2, the liftable valve seat 5 is at a low position under the action of self gravity of the liftable valve seat and the pre-compression force of the steel ball 8 and the reset spring 10, the core pipe 7 is plugged (shown in figure 1) at the moment, the steel ball 8 is pushed to move upwards to be separated from the conical closing-in 5-2 of the liftable valve seat 5 along with the fact that the core enters the core pipe 7, the check valve is opened, and flushing fluid in the core pipe 7 is discharged. When the inner pipe is salvaged, under the action of flushing fluid and self gravity, the steel ball 8 falls back to the conical closing-in 5-2 of the liftable valve seat 5, the one-way valve is closed, and the core in the pipe is in a closed pressure maintaining state. During surface coring operation, a liftable valve seat 5 in a core tube one-way valve mechanism which is salvaged to the ground is at a low position, a steel ball 8 is positioned at a conical closing-in 5-2 of the liftable valve seat 5, the one-way valve is closed, and two positioning insertion blocks 4-2 of a transposition sleeve 4 are clamped into two low-position insertion grooves 2-5 of a core tube joint 2 (as shown in a state I in a figure 11); an operator can move the thrust sleeve 3 upwards by one hand through a rectangular holding groove 3-1 on the outer wall of the thrust sleeve 3, the cylindrical pin 9 is driven by the thrust sleeve 3 to move to the top of the cylindrical pin avoiding hole 2-2, at the moment, the liftable valve seat 5 is lifted to a high position through the cylindrical pin 9, the return spring 10 is further compressed (as shown in a state II in figure 11), then the other hand of the operator pushes the transposition sleeve 4 upwards through an annular holding groove 4-1 on the outer wall of the transposition sleeve 4 to separate two positioning insertion blocks 4-2 of the transposition sleeve 4 from two low-position insertion grooves 2-5 of the core pipe joint 2, then the transposition sleeve 4 is rotated by 90 degrees, the two positioning insertion blocks 4-2 of the transposition sleeve 4 are slid into the high-position insertion grooves 2-3 of the core pipe joint (as shown in a state III in figure 11), and then the two hands of the operator respectively loosen the thrust sleeve 3 and the transposition sleeve 4, the thrust sleeve 3 and the liftable valve seat 5 move downwards under the action of the elastic force of the return spring 10 until the thrust sleeve 3 contacts the transposition sleeve 4 (as shown in a state IV in fig. 11), at the moment, the upper end of the core tube 7 is in an open state, a pressure relief channel is opened, negative pressure possibly generated at the upper end of the core tube is eliminated, and the core drilled in the complex stratum is easier to exit the tube.