CN-116556873-B - Asynchronous disconnecting device of blowout prevention tool for oil-water well casing and control method

CN116556873BCN 116556873 BCN116556873 BCN 116556873BCN-116556873-B

Abstract

The invention discloses an asynchronous disconnecting device and a control method of an oil-water well casing blowout prevention tool, wherein the asynchronous disconnecting device of the oil-water well casing blowout prevention tool comprises a retractable spring claw, an extensible spring claw, a disconnecting cylinder, a retractable limiting mechanism, an extensible limiting mechanism and a reset mechanism, wherein the outer wall of the retractable spring claw is provided with a first convex edge, the inner wall of the extensible spring claw is provided with a second convex edge matched with the first convex edge, the inside of the retractable spring claw is provided with the retractable limiting mechanism, the extensible spring claw is positioned inside the disconnecting cylinder, the inner wall, close to the top position, of the disconnecting cylinder is provided with the extensible limiting mechanism, and the reset mechanism is connected between the retractable spring claw and the disconnecting cylinder. When salvaging blowout prevention tool in the past, there is not special fishing tool, and current fishing tool can't realize repeatedly taking off and connect the function, and the success rate when leading to salvaging is low, has prolonged the salvage operation time, has reduced the efficiency of construction simultaneously and has increased the problem of cost of labor.

Inventors

HUANG YOUQUAN
GAO FEI
ZHANG PINGAN
ZHENG BING
LIU CHONGJIANG
SONG XINGLIANG
Ma Baitao
LIU YUCHUAN
YAO FEI
WANG PENGCHENG
LIN ZHONGCHAO
Zhao Chichuan

Assignees

大庆油田有限责任公司
中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220129

Claims (4)

1. An asynchronous disconnecting device of an oil-water well casing blowout prevention tool is characterized by comprising a contraction type spring claw (4), an expansion type spring claw (8), a disconnecting cylinder (7), a contraction limiting mechanism, an expansion limiting mechanism and a reset mechanism; the outer wall of the contraction type spring claw (4) is provided with a first convex edge (401), and the inner wall of the expansion type spring claw (8) is provided with a second convex edge (801) matched with the first convex edge (401); The telescopic spring claw (4) is internally provided with the telescopic limiting mechanism, the telescopic spring claw (4) is connected with the telescopic limiting mechanism, the telescopic limiting mechanism is used for preventing the side wall at the bottom end of the telescopic spring claw (4) from inwards shrinking, the telescopic limiting mechanism comprises a mandrel (5), the mandrel (5) is arranged in the telescopic spring claw (4), when the bottom end of the mandrel (5) is positioned in the telescopic spring claw (4) and is close to the bottom position, the outer side wall at the bottom end of the mandrel (5) is attached to the inner wall of the telescopic spring claw (4), the outer side wall of the mandrel (5) is provided with a third convex edge (501), the inner wall at the position close to the top of the telescopic spring claw (4) is provided with a fourth convex edge (402) matched with the third convex edge (501), the mandrel (5) is connected with the telescopic spring claw (4) through a pin (6), and the pin (6) is used for fixing the position at the bottom end of the mandrel (5) in the telescopic spring claw (4) and is close to the bottom position; The expanding spring claw (8) is positioned in the disconnecting cylinder (7), an expanding limiting mechanism is arranged on the inner wall, close to the top position, in the disconnecting cylinder (7) and used for preventing the side wall at the top end of the expanding spring claw (8) from expanding outwards, the top end position of the expanding spring claw (8) is positioned at the expanding limiting mechanism when the expanding spring claw is positioned at the initial position, the expanding limiting mechanism comprises a first protruding part (12) which is arranged on the inner wall, close to the top position, of the disconnecting cylinder (7), and when the top end of the expanding spring claw (8) is positioned in the disconnecting cylinder (7) and close to the top position, the outer wall at the top end of the expanding spring claw (8) is attached to the side wall of the first protruding part (12); The inner wall of the disconnecting cylinder (7) positioned above the first protruding part (12) in the disconnecting cylinder (7) is provided with a second protruding part (13), when the top end of the expanding spring claw (8) is positioned in the position close to the top in the disconnecting cylinder (7), the bottom surface of the second protruding part (13) is contacted with the top surface of the expanding spring claw (8); the restoring mechanism is connected between the contraction type spring claw (4) and the disconnection cylinder (7) and is used for enabling the expansion type spring claw (8) to be in the initial position in a natural state.
2. An asynchronous disconnecting device of an oil-water well casing blowout preventer according to claim 1, wherein the return mechanism comprises a return spring (10); The restoring spring (10) is sleeved outside the bottom end of the expanding spring claw (8), one end of the restoring spring (10) is connected with the inner bottom of the disconnecting cylinder (7), and the other end of the restoring spring is connected with the expanding spring claw (8).
3. The asynchronous disconnecting device of the blowout prevention tool for the oil-water well casing according to claim 1, further comprising a corrosion prevention ring (2); The anti-corrosion ring (2) is sleeved outside the retractable spring claw (4); the anti-corrosion ring (2) is made of aluminum alloy.
4. The asynchronous disconnection control method of the oil-water well casing blowout prevention tool based on the device of claim 1, which is characterized by comprising the following steps: when the expansion spring claw (8) and the contraction spring claw (4) are required to be separated asynchronously, controlling the contraction limiting mechanism to move upwards, wherein the contraction limiting mechanism is far away from the bottom end of the contraction spring claw (4); the contraction limiting mechanism drives the contraction type spring claw (4) to move upwards when moving, and the side wall at the bottom end of the contraction type spring claw (4) is blocked by the second convex edge (801) to contract inwards until the contraction type spring claw (4) is far away from the expansion type spring claw (8), so that asynchronous disengagement is completed; When the expansion type spring claw (8) is required to be in butt joint with the contraction type spring claw (4), the contraction type spring claw (4) is controlled to move downwards, when the bottom end of the contraction type spring claw (4) moves to be in contact with the expansion type spring claw (8), the expansion type spring claw (8) is pushed to move downwards, and after the top of the expansion type spring claw (8) is far away from the expansion limiting mechanism, the side wall of the top end of the expansion type spring claw (8) expands outwards, so that the contraction type spring claw (4) is inserted into the expansion type spring claw (8); The expanding spring claw (8) is driven to move upwards through the reset mechanism, when the top end of the expanding spring claw (8) moves to the expanding limiting mechanism, the side wall of the top end of the expanding spring claw (8) contracts inwards, and the side wall of the top end of the expanding spring claw (8) is prevented from expanding outwards through the expanding limiting mechanism, so that butt joint is completed.

Description

Asynchronous disconnecting device of blowout prevention tool for oil-water well casing and control method Technical Field The invention relates to the field of oil extraction engineering, in particular to an asynchronous disconnecting device of an oil-water well casing blowout prevention tool and a control method. Background In the underground operation process of an oil-water well, the problem of environmental pollution caused by the overflow condition of oil and a sleeve is frequently caused due to high formation pressure, and the non-well-killing blowout prevention operation is realized by adopting a releasing blowout prevention tool such as a sliding sleeve switch, a valve, a bridge plug, a packer and the like. Disclosure of Invention In view of the above, the invention provides an asynchronous disconnecting device and a control method of an oil-water well casing blowout prevention tool, which are used for solving the problems that when the blowout prevention tool is salvaged in the past, no special salvage tool exists, the existing salvage tool cannot realize the repeated disconnecting function, so that the success rate of salvage is low, the salvage operation time is prolonged, and meanwhile, the construction efficiency and the labor cost are reduced. In a first aspect, the invention provides a device comprising a contraction spring claw, an expansion spring claw, a release cylinder, a contraction limiting mechanism, an expansion limiting mechanism and a reset mechanism; The outer wall of the contraction type spring claw is provided with a first convex edge, and the inner wall of the expansion type spring claw is provided with a second convex edge matched with the first convex edge; The contraction type spring claw is internally provided with the contraction limiting mechanism, the contraction type spring claw is connected with the contraction limiting mechanism, and the contraction limiting mechanism is used for preventing the side wall at the bottom end of the contraction type spring claw from contracting inwards; the expanding spring claw is positioned in the disconnecting cylinder, an expanding limiting mechanism is arranged on the inner wall, close to the top position, in the disconnecting cylinder, and is used for preventing the side wall at the top end of the expanding spring claw from expanding outwards, and when the expanding spring claw is positioned at the initial position, the top end position of the expanding spring claw is positioned at the expanding limiting mechanism; And a reset mechanism is connected between the contraction type spring claw and the disconnecting cylinder and is used for enabling the expansion type spring claw to be in the initial position in a natural state. Preferably, the shrinkage limiting mechanism comprises a mandrel; The mandrel is positioned in the telescopic spring claw, and when the bottom end of the mandrel is positioned in the telescopic spring claw and is close to the bottom position, the outer side wall of the bottom end of the mandrel is attached to the inner wall of the telescopic spring claw; the outer side wall of the mandrel is provided with a third convex edge, and the inner wall of the retractable spring claw, which is close to the top, is provided with a fourth convex edge matched with the third convex edge; the mandrel is connected with the retractable spring claw through a pin, and the pin is used for fixing the bottom end of the mandrel at a position close to the bottom in the retractable spring claw. Preferably, the expansion limiting mechanism comprises: the inner wall of the release cylinder is provided with a first protruding part close to the top, and when the top end of the expansion spring claw is positioned in the release cylinder and is close to the top, the outer wall of the top end of the expansion spring claw is attached to the side wall of the first protruding part. Preferably, an inclined slope is arranged between the side wall of the first protruding part and the inner side wall of the disconnecting cylinder below; the inner wall of the disconnecting cylinder above the first protruding part is provided with a second protruding part, and when the top end of the expanding spring claw is positioned at a position close to the top in the disconnecting cylinder, the bottom surface of the second protruding part is contacted with the top surface of the expanding spring claw. Preferably, the reset mechanism comprises a reset spring; The restoring spring is sleeved outside the bottom end of the expansion spring claw, one end of the restoring spring is connected with the inner bottom of the disconnecting cylinder, and the other end of the restoring spring is connected with the expansion spring claw. Preferably, the anti-corrosion ring is also included; The anti-corrosion ring is sleeved outside the retractable spring claw; The anti-corrosion ring is made of aluminum alloy. In a second aspect, the present invention provides an asynchronous