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Pressing expansion type downhole annular blowout preventer and communication method thereof

A blowout preventer and expansion type technology, applied in the field of blowout prevention technology, can solve the problems of weak automation and danger, and achieve the effects of reducing the total cost, long service life and high safety factor

Active Publication Date: 2016-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operation of this type of blowout preventer requires manual lowering of the drill string, which has certain requirements on the skills of the workers. There will be certain dangers in the process of lowering the drill string, and the automation is relatively weak.

Method used

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  • Pressing expansion type downhole annular blowout preventer and communication method thereof
  • Pressing expansion type downhole annular blowout preventer and communication method thereof
  • Pressing expansion type downhole annular blowout preventer and communication method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0035] like figure 1 As shown, a pressure expansion downhole annular blowout preventer includes an upper joint (1), an annular slider (2), an outer sleeve (3), a central sleeve (4), a motor (5), a fixed Cylinder (6), hub (9), pressing slider (10), limit switch (11), check valve (12), upper rubber cylinder seat (13), rubber cylinder (14), lower rubber cylinder seat ( 15) and the lower joint (16); the upper joint (1) and the lower joint (16) are covered with the central cylinder (4) and are fixedly connected with the central cylinder (4) by threads, and the upper joint (1) has an annular chute (1-2) Cooperate with the annular slider (2), the leftmost end of the groove has a vent (1-1), and the upper joint (1) has an annular channel (1-3), the outer sleeve and The upper and lower joints adopt the most convenient threaded connection, which makes the fit more closely. The annular chute of the upper joint cooperates with the annular slider to facilitate the sliding of the slider. T...

specific Embodiment 2

[0036] Based on the device in Embodiment 1, the blowout prevention method of the downhole annular blowout preventer with pressure and expansion is as follows:

[0037] 1. When an overflow is found, the formation high-pressure fluid enters the drill string through the drill bit and flows upward. When the overflow is found, after the well is shut down on the ground, the formation high-pressure liquid enters the drill string through the drill bit and flows upward, so that the downhole blowout prevention tools near the drill bit are closed. , to block the internal channel of the drill string, and at the same time, the formation high-pressure fluid in the wellbore annulus passes through the lower joint of the downhole blowout preventer, and blowout prevention measures need to be taken at this time.

[0038] 2. The control command is issued by the ground control center (a) and transmitted to the encoder (b). The encoder (b) encodes the control command according to Manchester encoding...

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Abstract

The invention discloses a pressing expansion type downhole annular blowout preventer, and belongs to the technical field of downhole blowout prevention. The pressing expansion type downhole annular blowout preventer mainly comprises a communication module, a control module, a power module and an execution module. A rubber barrel of the execution module of the pressing expansion type downhole annular blowout preventer can be expanded when liquid is pressed in through a pressing sliding block, so that setting is realized. When a discharging passage communicates with the rubber barrel, the liquid in the rubber barrel flows out through the discharging passage, so that deblocking is realized. The pressing expansion type downhole annular blowout preventer can be used repeatedly, and is rapid in response, suitable for a full-well section and various well types, high in safety coefficient, long in service life, capable of achieving communication with a novel circulation passage after setting, and favorable for subsequent well killing operation.

Description

technical field [0001] The invention relates to a blowout prevention technology when well kick and blowout occur in the drilling process of oil and gas fields. Background technique [0002] Drilling plays a very important role in various tasks of oil exploration and oil field development, such as finding and confirming oil and gas structures, obtaining industrial oil flows, ascertaining the oil and gas bearing areas and reserves of proven oil and gas structures, and obtaining relevant The geological data and development data of the oil field, and finally the crude oil is taken from the ground to the ground, etc., are all done through drilling. means. [0003] During the drilling process, when drilling into oil and gas layers, if the bottom hole pressure is lower than the formation pressure, the formation fluid will enter the wellbore. After a large amount of formation fluid enters the wellbore, well kicks, blowouts, and even fires may occur. lead to major accidents. There...

Claims

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Application Information

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IPC IPC(8): E21B33/06E21B44/00E21B47/12
CPCE21B33/06E21B44/00E21B47/12
Inventor 黎伟宋伟雷鸿翔袁胜桐孙切宁点杨博杨牧宋金丽周妍竹罗献科李果林陈检
Owner SOUTHWEST PETROLEUM UNIV
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