Split-flow automatic control system of coal bed methane horizontal branch well and process thereof

An automatic control system and horizontal branch well technology, which is applied to the automatic control system of drilling, drilling equipment, flushing boreholes, etc., can solve the problems of large downhole pressure fluctuations, erosion of the well wall, and low rock-carrying efficiency, and eliminate Pressure fluctuations, reducing pressure fluctuations, and ensuring the effect of rock-carrying efficiency

Inactive Publication Date: 2012-10-03
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art, make full use of drainage and production vertical wells, and provide an automatic control system and technology for the diversion of coalbed methane horizontal branch wells, which can effectiv

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  • Split-flow automatic control system of coal bed methane horizontal branch well and process thereof
  • Split-flow automatic control system of coal bed methane horizontal branch well and process thereof
  • Split-flow automatic control system of coal bed methane horizontal branch well and process thereof

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing:

[0040] Such as figure 1 As shown in the automatic control system for diversion of coalbed methane horizontal branch wells, the coalbed methane well including the horizontal branch well 7 also includes a vertical well 24, and the upper part of the vertical well 24 is provided with a rotary control head 10 and a fully sealed ram blowout preventer 6. The coalbed methane well A mud pump 1, a mud pool 5 and an air compressor 16 are also connected, and the automatic control system for diversion of coalbed methane horizontal branch wells includes a surface manifold structure and an automatic control system.

[0041] The ground manifold structure includes the first mud input pipeline A, the second mud input pipeline B, the mud return pipeline C, the auxiliary mud return pipeline D and the gas injection pipeline E, and the first mud input pipeline A is from the mud pump 1 Connected...

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Abstract

The invention discloses a split-flow automatic control system of a coal bed methane horizontal branch well. The split-flow automatic control system of the coal bed methane horizontal branch well comprises a ground manifold structure and an automatic control system, the ground manifold structure comprises a first mud input pipeline (A), a second mud input pipeline (B), a mud outlet pipeline (C), an auxiliary mud outlet pipeline (D) and a gas injection pipeline (E), and the automatic control system comprises a field sensor, a field bus (26), an industrial control computer (27), a programmable logic controller PLC (29) and an electric actuating mechanism. The invention further discloses a well drilling process of the system. The split-flow automatic control system of the coal bed methane horizontal branch well and the well drilling process of the system have the advantages of being capable of eliminating pressure fluctuation in a shaft caused by a switch pump and capable of adjusting opening of a throttling valve automatically, guaranteeing that pressure in the shaft remains stable, being capable of guaranteeing that a gas phase and a liquid phase are mixed evenly in a coal bed methane horizontal branch well aerated underbalanced process, and preventing large displacement drilling fluid from flushing well walls while guaranteeing drilling fluid rock carrying efficiency of a high-inclination well section.

Description

technical field [0001] The invention relates to the technical field of coalbed methane horizontal branch well mining and its automation, in particular to an automatic control system and technology for coalbed methane horizontal branch well diversion for reducing the pressure fluctuation in the wellbore of the coalbed gas horizontal branch well. Background technique [0002] As a high-quality, high-efficiency and clean energy, coalbed methane has broad prospects for development and utilization. The main reasons restricting the large-scale development and utilization of coalbed methane are the low output and high cost of single wells of coalbed methane wells. The development of coalbed methane by horizontal branch wells is the solution to this problem. It is an important technical means, which can obtain high output at a lower cost and meet the requirements of industrial development. However, the use of horizontal wells to drill coal seams also poses higher challenges to drill...

Claims

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Application Information

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IPC IPC(8): E21B44/00E21B21/08E21B21/10
Inventor 李黔尹虎肖劲超杨先伦吴昊何小东
Owner SOUTHWEST PETROLEUM UNIV
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