CN-121976758-A - Side surface open hole annular pressure difference extrusion crushing type floating coupling

CN121976758ACN 121976758 ACN121976758 ACN 121976758ACN-121976758-A

Abstract

The invention relates to the technical field of oilfield drilling tools, in particular to a side surface open hole annular pressure difference extrusion crushing type floating coupling. The annular pressure difference extrusion crushing type floating coupling with the open side comprises a tubular body, an inward boss is arranged on the inner wall of the body, a blind plate is arranged on the boss, a firing pin ring is arranged above the blind plate, the upper surface area of the firing pin ring is larger than the lower surface area, liquid in a sleeve forms downward pressure difference on the upper surface and the lower surface of the firing pin ring, a plurality of exhaust passages are arranged in the side wall of the body, and the firing pin ring moves downwards to exhaust air from the exhaust passages. According to the side surface open hole annular pressure difference extrusion crushing type floating coupling, the area difference of the upper surface area and the lower surface area of the firing pin ring is used for generating pressure difference under the underground liquid pressure to control the opening pressure of the firing pin ring, and redundant gas is discharged through the exhaust passage, so that the influence of air in the device on the opening pressure of the firing pin ring is reduced, the stability of the opening pressure of the firing pin ring in the device working process is improved, and the incompletely crushed blind plates are prevented from scratching a rubber cylinder.

Inventors

ZHENG RUIQIANG
KOU ZHIHUI
ZHU YUNBO
ZHENG DIANFU
DONG PENGXIN
CAO YUBAO
WANG WEI
LI XIANGYONG

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: 20260505
Application Date: 20241025

Claims (9)

1. A side-vented annular pressure differential extrusion crushing floating collar, comprising: the device comprises a tubular body (2), wherein an inward boss is arranged on the inner wall of the body (2), a blind plate (8) is arranged on the boss, a firing pin ring (4) is arranged above the blind plate (8), the upper surface area of the firing pin ring (4) is larger than the lower surface area, a pressure difference is formed between the upper surface and the lower surface of the firing pin ring (4) when the device is put into a well, the firing pin ring (4) moves downwards under the action of the pressure difference, a plurality of exhaust passages are arranged on the side wall of the body (2), the positions of the exhaust passages correspond to the firing pin ring (4), redundant gas is discharged from the exhaust passages when the firing pin ring (4) moves downwards, and the lower surface of the firing pin ring (4) is an inclined surface.
2. The side-hole annular pressure differential extrusion crushing floating collar according to claim 1, wherein a plurality of pins (3) are arranged between the firing pin ring (4) and the body (2) and are connected through the pins (3), and the firing pin ring (4) moves downwards to extrude the blind plate (8) under the action of pressure difference after the pins (3) are broken.
3. The side-opening annular differential pressure extrusion crushing type floating coupling according to claim 1, wherein the firing pin ring (4) is of a step structure with a wide upper part and a narrow lower part, a shoulder matched with the shape of the firing pin ring (4) is arranged on the inner wall of the main body (2), the firing pin ring (4) is arranged in the main body (2) from top to bottom, and a gap exists between the top end of the firing pin ring (4) and the shoulder.
4. A side opening annular pressure differential squeeze broken floating collar as claimed in claim 3 wherein the vent passage communicates the space between the striker ring (4) and the shoulder to a liquid passage in the body (2), the striker ring (4) being lowered to vent gas from the space along the vent passage.
5. The side-opening annular pressure difference extrusion crushing type floating coupling according to claim 4, wherein the exhaust passage comprises an air inlet hole (5), an air passage (6) and an air outlet hole (7), the inner wall of the body (2) is provided with an air hole (6) and the air outlet hole (7) which are radially communicated, the position of the air hole (5) corresponds to the gap between the top end of the firing pin ring (4) and the shoulder, the air outlet hole (7) is positioned below the blind plate (8), and the air passage (6) connects the air outlet hole (7) with the air inlet hole (5).
6. The side surface open hole annular pressure difference extrusion crushing type floating coupling according to claim 5 is characterized in that an air passing groove is formed in the outer wall of the body (2) between the air inlet hole (5) and the air outlet hole (7), the air passing groove is used for connecting the air inlet hole (5) with the air outlet hole (7), a sealing sleeve (9) is arranged outside the body (2), the position of the sealing sleeve (9) corresponds to the air passing groove, and the upper surface of the air passing groove is sealed to form an air passage (6).
7. The side surface open hole annular pressure difference extrusion crushing type floating coupling according to claim 1, wherein an upper joint (1) is arranged at the top end of the body (2), and the top end of the body (2) is connected with the bottom end of the upper joint (1) through threads.
8. The side-opening annular pressure differential extrusion crushing floating collar according to claim 1, wherein a sealing gasket (10) is arranged between the lower part of the blind plate (8) and the boss.
9. The side-opening annular pressure differential extrusion crushing floating collar according to claim 1, wherein sealing rings are arranged between the upper joint (1), the firing pin ring (4) and the blind plate (8) and the inner wall of the body (2).

Description

Side surface open hole annular pressure difference extrusion crushing type floating coupling Technical Field The invention relates to the technical field of oilfield drilling tools, in particular to a side surface open hole annular pressure difference extrusion crushing type floating coupling. Background In the drilling work, the process of entering the horizontal section well can be contacted with the well wall and generate larger friction resistance due to overlarge dead weight of the sleeve, at the moment, the floating coupling is required to be installed on the sleeve, a section of air or other light media is sealed at the tail part of the sleeve string by the floating coupling, the buoyancy of the casing string below the floating coupling is increased, and therefore the pressure and friction force on the well wall are reduced, and the success rate of entering the sleeve is improved. In the prior art, the blind plate in the floating coupling is opened by providing enough pressure for the floating coupling through the pressure holding operation under the well, but the existing floating coupling is often subjected to unstable pressure when the blind plate is opened, if the opening pressure of the floating coupling is too high, the sleeve is subjected to over-high pressure bearing or pressure holding deformation, underground accidents are easy to occur, if the opening pressure of the floating coupling is too low, the floating coupling cannot completely crush the blind plate when the blind plate is opened, residual blind plate crushing particles can be attached to the inner wall of the floating coupling to cause the blind plate to be not in the diameter of the floating coupling, and when a rubber plug is put in, the residual particles can cause larger pressure fluctuation and have something weighing on one's mind rubber plug to seal the diameter, so that the sealing performance of the subsequent pipe string work is affected, and the working efficiency is affected. Therefore, in order to overcome the defects, the annular pressure difference extrusion crushing type floating coupling with the side surface provided with the holes is provided. Disclosure of Invention First, the technical problem to be solved Aiming at the defects of the prior art, the invention provides the annular pressure difference extrusion crushing type floating coupling with the side surface open holes, which solves the problem that the opening pressure of the floating coupling is unstable when the crushing blind plate is extruded. (II) technical scheme In order to solve the above problems, the present invention provides a side-open annular differential pressure extrusion crushing floating collar, comprising: The device comprises a tubular body, wherein an inward boss is arranged on the inner wall of the body, a blind plate is arranged on the boss, a firing pin ring is arranged above the blind plate, the upper surface area of the firing pin ring is larger than the lower surface area, a pressure difference is formed between the upper surface and the lower surface of the firing pin ring when the device is put into a well, the firing pin ring moves downwards under the action of the pressure difference, a plurality of exhaust passages are arranged on the side wall of the body, the positions of the exhaust passages correspond to the firing pin ring, redundant gas is discharged from the exhaust passages when the firing pin ring moves downwards, and the lower surface of the firing pin ring is an inclined plane. Preferably, a plurality of pins are arranged between the firing pin ring and the body and are connected through the pins, and the firing pin ring moves downwards to press the blind plate under the action of pressure difference after the pins are broken. Preferably, the firing pin ring is of a step structure with a wide upper part and a narrow lower part, the inner wall of the main body is provided with a shoulder matched with the shape of the firing pin ring, the firing pin ring is arranged in the main body from top to bottom, and a gap exists between the top end of the firing pin ring and the shoulder. Preferably, the vent passage communicates the space between the striker ring and the shoulder to a liquid passage in the body, and the striker ring, when lowered, vents gas in the space along the vent passage. Preferably, the exhaust passage comprises an air inlet hole, an air passage and an air outlet hole, wherein the inner wall of the body is provided with an air hole and the air outlet hole which are radially communicated, the position of the air hole corresponds to the gap between the top end of the firing pin ring and the shoulder, the air outlet hole is positioned below the blind plate, and the air passage connects the air outlet hole with the air inlet hole. Preferably, an air passing groove is arranged on the outer wall of the body between the air inlet and the air outlet, the air passing groove connects the air inlet with the air