A pressure opening device

Abstract

The invention relates to a blowout preventing hole opener for a casing pipe, and belongs to the fields of petroleum and natural gas machinery. The blowout preventing hole opener structurally comprises a pressing sleeve type pipe joint, a gate valve and a detachable drilling device, wherein the pressing sleeve type pipe joint is arranged on the side wall of the casing pipe and is fixed by safety slips; the gate valve and the detachable drilling device are sequentially connected behind the pressing sleeve type pipe joint. The blowout preventing hole opener is characterized in that the pressing sleeve type pipe joint is pressurized and locked on the lateral surface of the casing pipe by means of the safety slips and realizes sealing by means of a pressure sealing sleeve embedded in the end; a hoop connector is arranged on one end face of the pressing sleeve type pipe joint, and is positioned and connected with the gate valve to form an operation channel of a drill bushing and a drill bit. The blowout preventing hole opener is used for emptying gas and liquid in a well or a pipeline; by using the blowout preventing hole opener, the working efficiency is improved, potential safety hazards are eliminated, and safe production is guaranteed.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas machinery, and relates to opening and pressure relief of oil and natural gas wellhead casings, in particular to a blowout prevention and pressure relief device for opening holes from the side of the casing. Background technique [0002] With the long-term exploitation of oilfields, a large number of oil, gas, and water wells become geological or engineering obsolete wells every year due to loss of use value. Among these scrapped oil, gas, and water wells, some wells were sealed with ash injection before they were scrapped; some wells were closed with caps when they were shut down, and then welded to seal the wells. These abandoned wells have two major problems: one is that oil, gas and water will be redistributed in the formation after long-term development and injection-production adjustments in the oil field, which may easily cause blowout accidents, and it is difficult to deal with them...

AI Technical Summary

Problems solved by technology

These abandoned wells have two major problems: one is that oil, gas and water will be redistributed in the formation after long-term development and injection-production adjustments in the oil field, which may easily cause blowout accidents, and it is difficult to deal with them after the accidents; Continuous improvement, some abandoned wells have great re-exploitation value, but due to long-term closure, affected by factors such as changes in the underground environment, the pressure of oil and gas in the well is relatively high, and fire or blowout accidents are prone to occur during re-construction operations

[0003] The two kinds of hole saws whose notification numbers are CN203830779U and CN204094186 all punch holes on the cover cap at the upper end of the casing. Long pressure relief time, difficult disassembly, and not suitable for abandoned wells with ash injection sealing measures

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