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Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well

A technology for coalbed methane wells and composite fracturing, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc. layer permeability, reducing methane partial pressure, and reducing coal reservoir pollution

Inactive Publication Date: 2015-04-22
HENAN POLYTECHNIC UNIV +1
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Problems solved by technology

The active water fracturing technology generally used in China also has the above problems, such as relatively large filtration loss, low flowback rate, relatively large reservoir pollution, and unsatisfactory stimulation effect of coalbed methane wells. An important reason for the general low

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  • Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well

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Embodiment Construction

[0008] The present invention will be described in detail below in conjunction with embodiments.

[0009] A rapid flowback and production increase method for combined fracturing with active water-nitrogen injection in a coalbed methane well, characterized in that it comprises the following steps:

[0010] (a) According to the design scale of fracturing, first configure the liquid volume of active water, and configure it in strict accordance with the ratio and quality requirements of active water;

[0011] (b) Wellheads of coalbed methane wells, command vehicles, hydraulic fracturing vehicles, sand mixing vehicles and liquid nitrogen pump vehicles are well connected;

[0012] (c) Conduct pressure test according to fracturing design requirements to ensure that there is no puncture or leakage of high-pressure manifold;

[0013] (d) The liquid nitrogen pump truck shall pump nitrogen according to the fracturing design requirements, and the nitrogen discharge temperature shall not b...

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Abstract

The invention relates to the technical field of coal-bed gas exploration and development, in particular to an active water-nitrogen injection combination fracturing fast flow-back production increase method for a coal-bed gas well. The active water-nitrogen injection combination fracturing fast flow-back production increase method for the coal-bed gas well includes steps that using a liquid nitrogen pump truck to fill nitrogen when performing low-pressure low-permeability coal reservoir fracturing improvement, using a hydraulic fracturing truck to fill active water, and immediately opening flow to flow back after ending fracturing. The active water-nitrogen injection combination fracturing fast flow-back production increase method for the coal-bed gas well solves the problems of low even zero flow-back rate of flow opening, large pollution to the coal reservoir and low permeability after the active water fracturing improvement for the low-permeability coal reservoir of the coal-bed gas well. The active water-nitrogen injection combination fracturing fast flow-back production increase method for the coal-bed gas well can realize 80% flow-back rate, the pollution to the coal reservoir is small, and meanwhile, the nitrogen is capable of lowering the partial pressure of methane and improving the permeability of the oil reservoir and good for quickly desorbing the gas of the coal-bed gas well and improving the gas output.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploration and development, in particular to a rapid flowback and production increase method for coalbed methane well active water-nitrogen injection combined fracturing. Background technique [0002] Most of the coal reservoirs in China have the characteristics of low pressure and low permeability. When the reservoir is transformed, the liquid pressed into the reservoir must be discharged as much as possible quickly, otherwise the reservoir will be polluted and the permeability will be reduced. The active water fracturing technology generally used in China also has the above problems, such as relatively large filtration loss, low flowback rate, relatively large reservoir pollution, and unsatisfactory stimulation effect of coalbed methane wells. An important reason for the general low. Contents of the invention [0003] The object of the present invention is to provide a rapid flowback...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 曹运兴周丹田林曹永恒贾猛石玢
Owner HENAN POLYTECHNIC UNIV
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