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Amplitude and frequency design method of pulsating hydraulic fracturing in coal seams

A hydraulic fracturing and design method technology, applied in design optimization/simulation, computer-aided design, calculation, etc., to reduce construction pressure, increase area, and improve productivity

Active Publication Date: 2019-07-02
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a coal seam pulsating hydraulic fracturing amplitude and frequency design method, this coal seam pulsating hydraulic fracturing amplitude and frequency design method solves the problem of reasonable selection of construction parameters in the coal seam pulsating hydraulic fracturing process

Method used

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Embodiment Construction

[0022] The present invention is described further below:

[0023] The amplitude and frequency design method of the coal seam pulsating hydraulic fracturing is as follows:

[0024] Step 1. Carry out on-site coring of the expected fracturing coal seam, prepare standard rock samples for mechanical parameter testing, including 25*50mm and 50*25mm cores, and use the obtained coal cores to carry out uniaxial, triaxial compression and Brazilian splitting And variable-angle shear and other mechanical parameters tests, to obtain basic mechanical parameters such as coal and rock uniaxial and triaxial compressive strength, elastic modulus, Poisson's ratio and tensile strength, and use full-scale rock sample processing experimental specimens to carry out in-situ stress analysis. Test experiments, obtain in-situ stress data, and calculate vertical in-situ stress based on density logging and other data.

[0025] The processed standard coal rock core is used for cyclic load compression fail...

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Abstract

The invention relates to a coal bed pulsation hydraulic fracturing amplitude and frequency design method. The method comprises the specific steps that 1, basic mechanical parameters, in-situ stress data and pore pressure data of coal are acquired, and a coal strength theoretical model under a pulsation load is obtained; 2, a coal bed pulsation hydraulic fracturing finite element model is established; 3, pulsation pressure is applied to a fracturing well, a stress field of a coal bed is subjected to simulating computation under a certain pulsation frequency and amplitude construction parameter,and distribution of a disturbed stress field of coal bed pulsation hydraulic fracturing is determined; 4, the area of the coal bed of an effective damaged area formed by pulsation hydraulic fracturing transformation is determined, wherein coal for generating damage is coal with formed cracks, and the area of a crack network formed by pulsation hydraulic fracturing transformation is determined; 5,the third and fourth steps are repeated, the area of the crack network generated under different pulsation hydraulic fracturing amplitudes and frequencies is calculated, and a properest pulsation hydraulic fracturing amplitude and frequency parameter combination is calculated, analyzed and selected. According to the method, the coal bed fracturing transformation volume is increased to the greatest extent, and the productivity of a coal-bed gas well is effectively improved.

Description

technical field [0001] The invention relates to a coal seam pulsating hydraulic fracturing reservoir transformation technology, in particular to a method for designing the amplitude and frequency of coal seam pulsating hydraulic fracturing. Background technique [0002] Coalbed methane is an important unconventional oil and gas resource, and its development and utilization have attracted more and more attention and attention from all over the world. my country has abundant reserves of coalbed methane, as high as 36.8´10 12 m 3 , is the country with the third largest coalbed methane reserves in the world after Russia and Canada. If coalbed methane resources can be developed efficiently, it will be of great significance to my country's energy supply. The main component of coalbed methane is methane. When its air concentration reaches 5% to 16%, it will explode when exposed to open flames. This is also the root cause of coal mine gas explosion accidents. In addition, if the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E21B43/26
CPCE21B43/26G06F30/23G06F2119/06
Inventor 李玉伟贾丹孟婉浓杨帅柳波崔巍
Owner NORTHEAST GASOLINEEUM UNIV
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