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A rapid kill method for blowout wells

A fast technology for oil and gas wells, applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve problems such as slow progress, unreliability, and high cost, and achieve asset preservation, reliability, and speed Effect

Active Publication Date: 2013-05-01
刘现华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As shown in the above two oil and gas well blowout accidents, the mud injection technology currently used has serious shortcomings: the top mud injection method often fails and is not reliable; the mud injection method at the bottom of the rescue well is expensive and slow, because drilling It usually takes about three months to rescue the well

Method used

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  • A rapid kill method for blowout wells

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Effect test

Embodiment 1

[0015] Spherical is the preferred solid block shape for pressure blasting and retrieval. It is recommended that the size of the injection ball be less than 30% of the inner diameter of the oil and gas well.

Embodiment 2

[0017] Oil well blowout can use larger size pressure injection ball, as long as the vertical pipe can be safely inserted into the well deeper; natural gas blowout can use smaller size pressure injection ball, because the gas is lighter and needs pressure injection ball in the well The bottom is packed to form a small gap between the balls to prevent the passage of air.

Embodiment 3

[0019] When the blowout is strong at the beginning of blowout, you should use high-density spray balls, then use medium-density spray balls, and then use a large number of low-mass density spray balls. The large-mass density ball can be a steel ball or a steel ball; the medium-mass density ball can be a stone ball or a steel ball; the small-mass density ball can be a rubber or other material ball covered with a steel skin. Steel and other environmentally friendly materials can be used as the cover.

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Abstract

This invention is a rapid and reliable kill and restoration technique and its implementation system for the well blowout accidents. It uses solid particles to block, suppress and greatly reduce the blowout flow to gain time for repair or replacement of the damaged blowout preventer and other devices, and connection of production pipelines. It then takes out some of the solid particles to restore well production. In such a way, environmental damage is greatly reduced and the well is kept as a valuable production asset. While any shape of solid particles may be used, the ball shape is an optimum for the kill and restoration operation; hence kill balls are the recommended solid particles. An implementation system for the ball kill procedure consists of a tubing system, a blower or a pump, a ball injection device and a cage. The cage mounted on the tubing and sits on top of the well will temporally contain the blown out balls at the early stage of the kill process. Balls in the cage will fall down to the well as the flow is reduced. An implementation system for the restoration process consists of a tubing system, a pump and a balls storage tank.

Description

technical field [0001] The invention belongs to the technical field of emergency response measures for oil and gas well blowout out of control accidents, and in particular relates to a rapid pressure blowout method for oil and gas wells. Such as the August 2009 gas blowout of the Thai oil company Montara in the Timor Sea in Australia and the April 2010 blowout of the British Petroleum Company Macondo oil well in the US Gulf of Mexico have caused huge disasters. Background technique [0002] At present, there are two main technologies to deal with the out-of-control blowout of oil and gas wells. One is the top pressure injection method, that is, the pressure injection mud is pumped from the top of the accident well; the other is the rescue well method, that is, the rescue well is drilled to communicate with the bottom of the accident well and the pressure injection mud is pumped to the bottom of the accident well. Both of these technologies rely on the gravity of the jetting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12E21B33/10E21B33/02E21B33/13
CPCE21B33/13E21B33/076E21B21/08
Inventor 刘现华
Owner 刘现华
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