A suspension device and method for controlling release by using hydraulic pressure difference

A technology for controlling release and suspension devices, applied in the field of drilling, which can solve problems such as increased chance of rework, polluted wellhead, unrecoverable steel balls, etc., and achieves the effect of improving the success rate

Active Publication Date: 2017-02-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, many oil wells use tools such as sliding sleeves and suspensions in the downhole tools to achieve a certain purpose according to their technology. After going into the well, whether it is a sliding sleeve or a hand-dropping tool, it is basically solved by throwing a ball to suppress the pressure. The current method There are great limitations. Some processes will have multiple multi-stage pressure suppression, and there is no salvage bar, and the steel balls cannot be recovered, resulting in complex downhole conditions; And the difficulty of operation is increased, the wellhead is seriously polluted, and the working environment of the operators is harsh
Secondly, the chance of rework increases due to the inability to drop hands

Method used

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  • A suspension device and method for controlling release by using hydraulic pressure difference

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, a suspension device controlled and released by hydraulic pressure difference is composed of upper joint 1, device body 2, slips 3, differential pressure sliding sleeve 4, spring 5, and load bearing joint 6, upper joint 1 and device body 2. The tubing buckle is connected by the tubing buckle. The slip 3 is nested in the upper joint 1, the differential pressure sliding sleeve 4 and the spring 5 are nested in the device body 2, and the outer diameter of the bearing joint 6 is connected with pressure Differential sliding sleeve 4, spring 5, bearing joint 6 are positioned and suspended at slip 3, and the design suspension weight is 30KN;

[0019] The outer diameters of the upper joint 1 and the device body 2 are both φ95mm or greater than φ95mm;

[0020] The upper joint 1 and the device body 2 are connected by a φ73mm tubing buckle, or a tubing buckle larger than φ73mm;

[0021] The outer diameter of the bearing connector 6 is φ46mm or greater than φ46m...

Embodiment 2

[0024] A controlled release method using hydraulic pressure difference, including the following steps:

[0025] After the downhole tool is connected to the suspension device controlled and released by hydraulic pressure difference, the suspension device released by hydraulic pressure difference control is lowered into the predetermined position in the well, and the workover fluid is pumped from the tubing. When the pressure difference reaches 3-4Mpa, the pressure When the differential sliding sleeve 4 goes down and the driving force of the differential sliding sleeve 4 exceeds the starting force of the spring 5, the differential sliding sleeve 4 moves down to the supporting surface that is separated from the supporting slips. At this time, the slips 3 are opened, and the bearing joint 6 is in contact with the phase. The connecting tools are released and dropped together to achieve the expected purpose. The differential pressure sliding sleeve 4 is automatically returned to the pos...

Embodiment 3

[0029] A suspension device that uses hydraulic pressure difference to control and release is composed of upper joint 1, device body 2, slips 3, differential pressure sliding sleeve 4, spring 5, and load bearing joint 6. The outer diameters of upper joint 1 and device body 2 Both are φ95mm. The upper joint 1 and the device body 2 are connected by a φ73mm tubing buckle through a connecting thread. The bearing joint 6 has an outer diameter of φ46mm and an inner diameter of φ28mm. The slip 3 is nested in the upper joint 1, the differential pressure sliding sleeve 4, spring 5 It is nested in the device body 2, the diameter of the device body 2 is φ52mm, the bearing joint 6 is positioned and hung at the slip 3, and the design suspension weight is 30KN.

[0030] The slip 3 is connected to the upper joint 1 in a rotary movable connection.

[0031] A differential pressure sliding sleeve 4 and a spring 5 are nested inside the body 2 of the device. One side of the differential pressure slidin...

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PUM

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Abstract

The invention discloses a hanging device for controlling release through hydraulic pressure difference and a release controlling method thereof, and belongs to the drilling technical field. After a well descending tool is connected with the hanging device for controlling release through the hydraulic pressure difference, the hanging device for controlling release through the hydraulic pressure difference is tripped into a preset position inside a well, workover fluid is pumped therein from the inside of an oil pipe, and when the pressure difference value reaches 3-4 MPa, a pressure difference sliding sleeve descends; when the pressure difference sliding sleeve driving force exceeds spring starting force, the pressure difference sliding sleeve moves downwards to the position which is disengaged from a supporting face used for supporting a slip, at the moment, the slip is opened, a bearing connector and the well descending tool connected with the bearing connector are released to fall together, so that an expected purpose is achieved, the pressure difference sliding sleeve returns automatically under the action of a spring, and the pressure difference sliding sleeve can be cleaned and maintained to be used continuously after being pulled out. By means of the hanging device for controlling release through the hydraulic pressure difference and the release controlling method, the phenomenon that ball throwing is conducted for a long time, no fishing devices exist, and thus the downhole condition is complex can be avoided, it is guaranteed that the downhole operating environment cannot be polluted, and cleanliness and sanitation are achieved; after the method is matched with a pipe inner sand washing technology, the problem that an inner wash pipe can be stuck when returning to the oil pipe in the sand washing process is solved, and therefore the continuous sand washing purpose can be achieved.

Description

Technical field [0001] The invention relates to a suspension device and a controlled release method for controlled release using hydraulic pressure difference, and belongs to the technical field of drilling. Background technique [0002] At present, many oil wells use tools such as sliding sleeves and suspensions in order to achieve a certain goal according to their technology. After going down the well, whether it is a sliding sleeve or a throwing tool, it is basically solved by throwing a ball to hold down the pressure. The current method There are great limitations. Some processes have multiple levels of pressure holding, and there is no salvage bar, and the steel balls cannot be recovered, which makes the downhole situation complicated; if the pressure is held down or the hand fails, the wellhead pipe string cannot be connected and the wellhead operation volume And the difficulty of the operation is increasing, the wellhead is seriously polluted, and the working environment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00
Inventor 师成灿
Owner PETROCHINA CO LTD
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