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Non-well-killing tripping method for gas drilling of reservoir

A gas drilling and tripping technology, which is applied to valve devices of wellbore/well, components of wellbore/well, earth-moving drilling and production, etc., can solve the problems of poor efficiency of input and output, easy damage, and difficult to find, etc. Achieving the effect of strong security and operability

Active Publication Date: 2019-05-10
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low porosity (<10%), ultra-low permeability (<0.1mD) and unique fluid storage and production characteristics of tight oil and gas reservoirs, the bottleneck problems faced by conventional drilling include vulnerability to damage, difficulty in discovery, low single well production, Inefficient input and output

Method used

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  • Non-well-killing tripping method for gas drilling of reservoir

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Embodiment 1

[0032] As a preferred embodiment of the present invention, it discloses a method for snubbing and tripping in reservoir gas drilling, including wellhead device configuration, sand discharge pipeline configuration, snubbing and tripping process and snubbing and tripping process Four parts, wherein: the wellhead device configuration is configured to configure reservoir gas drilling wellhead control facilities for snubbing and tripping; the sand discharge pipeline configuration is for reservoir gas drilling to perform snubbing and tripping The combustible gas ground discharge channel has a diameter of not less than 203mm. The sand discharge pipeline is laid straight to the combustion pool. If there is a change of direction due to conditions, the turning angle in the well site is not less than 150°, and the sand discharge pipeline ends at the edge of the well site. The pressure relief safety valve is installed in the straight-through direction, and the set pressure is not higher th...

Embodiment 2

[0034] Referring to the accompanying drawings of the description, as the best implementation mode of the present invention, it includes four parts: wellhead device configuration, sand discharge pipeline configuration, snubbing tripping process and snubbing tripping process, wherein:

[0035] Wellhead device configuration is a wellhead control facility for reservoir gas drilling to perform snubbing and tripping, including rotary blowout preventer 3, annular blowout preventer 5, double ram blowout preventer 15, drilling four Pass 8, throttle manifold 21, blowout prevention pipeline 13 and blowout pipeline 22;

[0036] Annular blowout preventer 5 controls the pressure to be lowered to 5.0-6.0Mpa when pulling out the drill.

[0037] The double ram blowout preventer 15 is installed on the half-sealed ram 6, and the fully-sealed ram 7 is installed on the bottom.

[0038] A hydraulic flat valve 14 is installed near the wellhead side of the blowout prevention pipeline 13. The hydraul...

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Abstract

The invention discloses a non-well-killing tripping method for gas drilling of a reservoir, and belongs to the field of full-process underbalance and gas drilling. The method includes the steps of wellhead device arrangement, sand discharge pipeline arrangement, tripping out without well killing and tripping in without well killing. According to the method, device arrangement, process steps and technical requirements for tripping without well killing are met after a gas layer is drilled in a gas drilling process, the method has very high safety and operability, the whole drilling and completion process can be kept in an unbalanced state in the gas drilling process of the reservoir, and no damage is caused to the reservoir.

Description

technical field [0001] The present invention relates to oil and natural gas drilling technology, in particular to a tripping method that utilizes gas as a circulating medium when drilling a gas layer, which is safe and has zero damage to the reservoir, and belongs to the field of underbalanced and gas drilling in the whole process . Background technique [0002] With the gradual depletion of high-yield and easily exploitable oil and gas resources and the increasing demand for oil and gas, unconventional oil and gas are realistic strategic replacement resources. Tight oil and gas is a category of unconventional oil and gas, and it is also the category with the greatest potential for oil and gas resources. my country's tight oil and gas accounts for 35% of the newly proven oil reserves in recent years, accounting for more than 40% of the undiscovered oil resources. Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic-Cretaceous, Paleogene, etc.) are all distributed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/03E21B33/06E21B34/02E21B21/01
Inventor 李宬晓周长虹邓虎许期聪范黎明肖劲超董仕明颜海李刚刘殿琛黄述春
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD