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CN-121993109-A - Sealing device applied to double-cylinder single-action airtight coring tool

CN121993109ACN 121993109 ACN121993109 ACN 121993109ACN-121993109-A

Abstract

The invention relates to the technical field of petroleum drilling coring, in particular to a sealing device applied to a double-cylinder single-action airtight coring tool. The device comprises a mandrel, wherein a needle valve is arranged at the top end of the mandrel, a sealing piston is arranged at the bottom end of the mandrel, a wire plug is sleeved on the outer side of the middle section of the mandrel, a gap is formed between the wire plug and the mandrel, at least two groups of bearings are arranged in the gap, the top end of the wire plug is welded with the bottom end of a handle, the mandrel is sleeved in the top end of the handle, a bearing bracket is arranged at the bottom of the wire plug, and a coring tool is detachably connected with the outer side of the wire plug and is a double-cylinder single-acting airtight coring tool. The sealing device applied to the double-cylinder single-action airtight coring tool provided by the invention ensures the tightness of the coring tool and the double-cylinder single-action tool structure of the coring tool through the mutual matching of the sealing piston and the bearing, can rapidly release pressure during pressure release, and prevents the problem that the pressure release channel is blocked by a fluid solid phase and cannot release pressure during pressure when the inside of the coring tool is suppressed.

Inventors

  • TIAN JIAQI
  • WANG HAIMIAO
  • WANG JUNJIE
  • QI YUE
  • ZHANG ZHENHUA
  • LI KAI
  • LI CHUNLIN
  • ZHANG YULONG
  • WANG YUXI
  • LI YI
  • Han yuncheng

Assignees

  • 大庆钻探工程有限公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260508
Application Date
20241031

Claims (11)

  1. 1. A sealing device for a double-cylinder single-action closed coring tool, comprising: the device comprises a mandrel (2), wherein a needle valve (1) is arranged at the top end of the mandrel (2), a sealing piston (6) is arranged at the bottom end of the mandrel (2), a wire plug (4) is sleeved on the outer side of the middle section of the mandrel (1), a gap is arranged between the wire plug (4) and the mandrel (2), at least two groups of bearings (8) are arranged in the gap, the top end of the wire plug (4) is welded with the bottom end of a handle (3), the top end of the mandrel (2) is sleeved on the inner part of the top end of the handle (3), a bearing bracket (5) is arranged at the bottom of the wire plug (4), and a coring tool is detachably connected to the outer side of the wire plug (4) and is a double-cylinder single-action airtight coring tool; The bearing (8) drives the mandrel (2) to rotate, double-rod single action of the coring tool is completed through cooperation of the bearing (8) and the mandrel (2), the bottom end of the coring tool is provided with a sealing piston (6), the coring tool is sealed through the sealing piston (6), primary pressure relief is achieved through cooperation between the needle valve (1) and the mandrel (2), and secondary pressure relief is achieved through the sealing piston (6).
  2. 2. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 1, wherein the top end of the needle valve (1) is of a cuboid structure, the bottom end of the needle valve (1) is of a cone structure, the middle of the needle valve (1) is of a cylindrical threaded structure, the width of the cuboid structure is smaller than the diameter of the cylindrical threaded structure, the diameter of the cylindrical threaded structure is matched with the diameter of the bottom surface of the cone structure, the needle valve (1) is installed and unlocked through the cuboid structure, the needle valve (1) is connected with the top end of the mandrel (2) through the cylindrical threaded structure, and the needle valve (1) seals the top end of the mandrel through the cone structure.
  3. 3. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 2, wherein the mandrel (2) is provided with a hollow cylinder structure, the inside of the hollow cylinder structure is provided with threads, and the mandrel (2) is provided with a cylinder thread structure of a needle valve through internal threads.
  4. 4. A sealing device for use with a double-barrel single-action closed coring tool as in claim 3, wherein said hollow cylinder has an inside diameter compatible with an outside diameter of said cylinder thread structure.
  5. 5. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 3, wherein a hollow groove is formed in the top end of the inside of the hollow cylinder, a needle valve sealing ring (7) is installed in the hollow groove, the hollow cylinder is a central pore canal, and the central pore canal and the needle valve (1) are sealed through the needle valve sealing ring (7).
  6. 6. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 5, wherein the needle valve (1) is unscrewed preliminarily to open the central hole of the mandrel (2), and the mandrel (2) completes the primary pressure relief of the coring tool through the central hole.
  7. 7. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 1, wherein the sealing piston (6) is of a cylindrical cavity structure, the top end inside the sealing piston (6) is welded with the bottom end of the mandrel (2), at least two grooves are formed in the outer side of the sealing piston (6), and a sealing ring is installed on the sealing piston (6) through the grooves.
  8. 8. The sealing device applied to the double-cylinder single-action airtight coring tool according to any one of claims 6 to 7, wherein after the coring tool is subjected to primary pressure relief, the coring tool is disassembled, the sealing piston (6) is suspended and separated from the coring tool, the hollow pore canal is formed in the cylindrical cavity structure, and the sealing piston (6) is used for completing secondary pressure relief of the coring tool through the hollow pore canal.
  9. 9. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 1, wherein the handle (3) is provided with a hollow cylinder structure, and the handle (3) is mounted on the top end of the mandrel (2) through the hollow cylinder structure.
  10. 10. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 1, wherein the plug head (4) is of a cylindrical hollow structure, the outer side of the cylindrical hollow structure is provided with threads, the plug head (4) is connected with the coring tool through external threads, the interior of the cylindrical hollow structure is provided with threads, and the cylindrical hollow structure is connected with the bearing bracket (5) through internal threads.
  11. 11. The sealing device applied to the double-cylinder single-action airtight coring tool according to claim 10, wherein a gap is arranged between the inside of the cylindrical hollow structure and the outside of the mandrel (2), a bearing (8) arranged in the gap is fixed by the bearing bracket (5), and the top end of the bearing (8) is the mandrel (2).

Description

Sealing device applied to double-cylinder single-action airtight coring tool Technical Field The invention relates to the technical field of petroleum drilling coring, in particular to a sealing device applied to a double-cylinder single-action airtight coring tool. Background At present, when the airtight coring process is carried out in actual production, the upper sealing technology adopted is mainly a plug upper seal, but the sealed coring structure sealed by the plug mainly has two groups of defects, one of which is that the structure cannot be used in a double-cylinder single-action coring tool, and the other is that the pressure release of the structure is slow and the safety risk exists. However, in actual production, the pressure relief plug on the common closed coring tool can only be applied to the double-cylinder double-acting coring tool, but when the pressure relief plug is applied to the double-cylinder coring tool, the pressure relief plug has the defects of low pressure relief efficiency and low pressure relief safety. Therefore, in order to overcome the defects, the sealing device applied to the double-cylinder single-action airtight coring tool is provided. Disclosure of Invention First, the technical problem to be solved The invention provides a sealing device applied to a double-cylinder single-action airtight coring tool, which aims to solve the problems that the traditional airtight coring tool cannot be sealed by the double-cylinder double-action coring tool in the prior art, the pressure release efficiency is poor when the traditional airtight coring tool is released, the pressure release safety risk is high and the like. (II) technical scheme In order to solve the above problems, the present invention provides a sealing device applied to a double-cylinder single-action closed coring tool, comprising: The device comprises a mandrel, wherein a needle valve is arranged at the top end of the mandrel, a sealing piston is arranged at the bottom end of the mandrel, a wire plug is sleeved on the outer side of the middle section of the mandrel, a gap is formed between the wire plug and the mandrel, at least two groups of bearings are arranged in the gap, the top end of the wire plug is welded with the bottom end of a handle, the top end of the mandrel is sleeved inside the top end of the handle, a bearing bracket is arranged at the bottom of the wire plug, a coring tool is detachably connected with the outer side of the wire plug, and the coring tool is a double-cylinder single-action airtight coring tool; The bearing drives the mandrel to rotate, double-rod single action of the coring tool is completed through cooperation of the bearing and the mandrel, the bottom end of the coring tool is a sealing piston, the coring tool is sealed through the sealing piston, primary pressure relief is achieved through cooperation between the needle valve and the mandrel, and secondary pressure relief is achieved through the sealing piston. Preferably, the top of needle valve is established to cuboid structure, and the bottom of needle valve is established to cone structure, and the centre of needle valve is established to cylinder screw thread structure, and cuboid structure's width is less than cylinder screw thread structure's diameter, and cylinder screw thread structure's diameter and cone structure's bottom surface diameter are suited, the needle valve is through cuboid structure installation shackle, the needle valve passes through the top of cylinder screw thread structure connection mandrel, the needle valve passes through the top of cone structure sealed mandrel. Preferably, the spindle is provided as a hollow cylindrical structure, the inside of which is provided with threads, and the spindle is provided with a cylindrical thread structure of a needle valve by means of internal threads. Preferably, the inner diameter of the hollow cylinder is adapted to the outer diameter of the cylinder thread structure. Preferably, the top inside the hollow cylinder is equipped with the empty slot, empty slot installation needle valve sealing washer, the hollow cylinder is the central pore, central pore with seal through the needle valve sealing washer between the needle valve. Preferably, the needle valve is initially unscrewed, the central bore of the mandrel is opened, and the mandrel completes the primary pressure relief of the coring tool through the central bore. Preferably, the sealing piston is of a cylindrical cavity structure, the top end inside the sealing piston is welded with the bottom end of the mandrel, at least two grooves are formed in the outer side of the sealing piston, and the sealing piston is provided with a sealing ring through the grooves. Preferably, after the preliminary pressure release of coring tool, the coring tool is disassembled, the sealing piston is suspended and separated from the coring tool, the inside of the cylinder cavity structure is a hollow pore canal, and the seal