Multi-fracture parameter inversion method and device based on G function curve analysis
A technology of parameter inversion and curve analysis, applied in electrical digital data processing, instrumentation, design optimization/simulation, etc., can solve problems such as inability to invert and evaluate fracture parameters, difficulty in quickly determining fracture width and fluid loss coefficient, etc.
Active Publication Date: 2022-03-11
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
[0004] Fracture length, fracture width, and fluid loss coefficient are key parameters for pump-off pressure drop test analysis. In the development process of existing unconventional reservoirs, due to the influence of stress shadow and flow dynamic distribution, the fracturing stages at all levels It is difficult to quickly determine the fracture length, fracture width, and fluid loss coefficient after multiple fractures are simultaneously competitively expanded, making it impossible to perform fracture parameter inversion and evaluation within a relatively short period of time between fracturing stages at all levels
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[0085] The following will clearly and completely describe the technical solutions in the embodiments herein in conjunction with the accompanying drawings in the embodiments herein. Obviously, the described embodiments are only some of the embodiments herein, not all of them. Based on the embodiments herein, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the scope of protection herein.
[0086] In the field of petroleum, fracturing refers to a method of using hydraulic action to form cracks in oil and gas layers during the process of oil or gas recovery. The most common fracturing method is hydraulic fracturing. Among them, the multi-fracture hydraulic fracturing stimulation technology has been widely used in the development of unconventional oil and gas such as shale gas. Determining and controlling the fracture parameters after the simultaneous expansion of multiple fractures can effectively guide the fractur...
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The invention provides a multi-fracture parameter inversion method and device based on G function curve analysis, and the method comprises the steps: delimiting an effective filtration analysis range according to bottom hole pressure data after a hydraulic fracturing pump is stopped; according to the bottom hole pressure data in the effective filtration analysis range, a G function curve representing the relation between the bottom hole pressure and a dimensionless time function is determined; calculating the slope of a straight line part in the G function curve to determine fitting pressure; determining an induced stress influence factor function and a net pressure function of each fracture according to the bottom hole pressure data, the fracture basic data and the formation parameters in the effective filtration analysis range; according to the fitting pressure, the induced stress influence factor function, the net pressure function of each crack and the stratum parameters, crack parameters of each cluster of cracks are determined, the crack parameters comprise the crack length, the crack width and the filtration coefficient, and the crack parameters, namely the crack length, the crack width and the filtration coefficient, are rapidly solved.
Description
technical field [0001] The invention relates to the field of fracturing testing, in particular to a multi-fracture parameter inversion method and device based on G-function curve analysis. Background technique [0002] With the deepening of oil field development, the development of oil and gas reservoirs is becoming more and more difficult. In order to fully exploit oil and gas wells, the reservoir usually refers to the oil layer or gas layer to be treated by fracturing. In the field of petroleum, fracturing refers to a method of using hydraulic action to form cracks in oil and gas layers during the process of oil or gas recovery. The most common fracturing method is hydraulic fracturing. Among them, the multi-fracture hydraulic fracturing stimulation technology has been widely used in the development of unconventional oil and gas such as shale gas. Determining and controlling the fracture parameters after the simultaneous expansion of multiple fractures can effectively gui...
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Login to View More IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 胡晓东涂志勇周福建黄国鹏罗英浩苟晓燕杨凯左洁梁天博李奔曲鸿雁姚二冬王博刘雄飞
Owner CHINA UNIV OF PETROLEUM (BEIJING)