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Gas reverse-circulation well-drilling method

A reverse circulation and gas technology, applied in the field of drilling and oil drilling, can solve the problems of reduced comprehensive economic benefits, restrictions on the application and development of gas drilling, high fuel costs, etc., to reduce equipment costs and maintenance costs, and reduce downhole complexity , the effect of fast drilling speed

Active Publication Date: 2019-07-19
CHINA PETROCHEMICAL CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of large boreholes and deep wells, the traditional positive circulation method requires a huge amount of gas, and the cost of fuel remains high, which greatly reduces the overall economic benefits. Especially under the new normal of "low oil prices", the application of gas drilling is seriously restricted. and development

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  • Gas reverse-circulation well-drilling method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing:

[0022] Refer to the attached figure 1 and 2 , a drilling system used in a gas reverse circulation drilling method includes: a drilling pump set, a top drive 2, a top drive adapter 3, a rotating blowout preventer diversion device 5, a blowout preventer set 6, casing 7, and a double-walled drill pipe 8. Flow channel conversion device 10 , conventional drilling tool 11 and drill bit 12 . Wherein: the double-wall drill rod 8 is composed of a concentric inner drill rod 81 and an outer drill rod 80, an annular gap B14 is formed between the inner drill rod 81 and the outer drill rod 80, and the lower ends of the inner drill rod 81 and the outer drill rod 80 are There is a hole D103 in the radial direction of the inner part, and the hole D103 is connected with the inner hole A15 of the double-wall drill pipe 8 and the outer annular gap A13. The inside of the inner drill pipe 81 f...

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Abstract

The invention discloses a gas reverse-circulation well-drilling method. According to the gas reverse-circulation well-drilling method, a well-drilling system comprising a well-drilling pump set, a topdrive, a top drive adapter, a rotary blowout-preventing flow guiding device, a blowout preventer group, a casing, a double-wall drill pipe, a flow channel conversion device, a conventional drilling rig and a drill bit is used; and the gas reverse-circulation well-drilling method comprises the steps that during gas injection and well-drilling, one path of injected gas passes through the top drive,the top drive adapter, the double-wall drill pipe, the flow channel conversion device, the conventional drilling rig and the drill bit to enter a well bottom annular space, the other path of the injected gas enters the well bottom annular space through the rotary blowout-preventing flow guiding device; and the two paths of injected gas converge in the well bottom annular space and then passes through the flow channel conversion device, the double-wall drill pipe and the top drive adapter to return to a grit chamber. The gas reverse-circulation well-drilling method has the advantages that thegas using amount is small, the drilling speed is high, and low-cost well drilling can be achieved; and the gas reverse-circulation well-drilling method meets the well-drilling well control and well-drilling safety requirements in the field of oil drilling.

Description

technical field [0001] The invention relates to a drilling method in the technical field of drilling, in particular to a gas reverse circulation drilling method in the field of petroleum drilling. Background technique [0002] Gas drilling is a special underbalanced drilling technology developed since the 1950s in which gas-phase fluid is the circulating medium. Compared with conventional liquid-phase drilling technology, gas drilling technology can effectively avoid or reduce lost circulation accidents; Drilling speed in brittle formations reduces drilling costs and shortens well construction period; effectively protects low-permeability reservoirs from drilling fluid damage and improves single well oil and gas recovery and production; due to the reduction of drilling fluid column holding effect, it can be easily found And improve the drilling rate of low-pressure and low-permeability reservoirs, and realize the evaluation of reservoirs while drilling; in addition, because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/18E21B21/16
CPCE21B7/18E21B21/16
Inventor 朱焕刚陈永明康波曹强王树江李建成孙铭新韩玉华邓霖许强赵亚坤赵鹏
Owner CHINA PETROCHEMICAL CORP
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