Physical simulation method of coal-bed gas well hydraulic fractures

Abstract

The invention discloses a physical simulation method of coal-bed gas well hydraulic fractures. According to the method, a real three-shaft fracture simulating test frame is arranged, a fracture test piece with a wellbore hole simulator is placed in the real three-shaft fracture simulating test frame, and sound transmitting probes tightly adhere to the eight corners of the fracture test piece respectively through plastic cement and are connected with sound transmitting receivers through acoustic emission signal amplifiers; a hydraulic pressure stabilizer is connected to the exterior of the real three-shaft fracture simulating test frame; the top of the wellbore hole simulator is connected with an oil and water separator through a fracturing liquid pipeline, guar glue hydraulic fracturing liquid is added to the upper portion of the oil and water separator, and oil is added to the lower portion of the oil and water separator; a control panel is connected to the bottom of the oil and water separator. With the physical simulation method of coal-bed gas well hydraulic fractures, generation and development of fractures in the test piece can be detected in real time in the hydraulic fracturing physical simulation process in a laboratory, the three-dimensional characteristic analysis of the fractures is paid attention to, the method is not confined to observation on the extension of the fractures on the surface of the fracture test piece, and the extension process of the fractures can be better reflected.

Description

technical field [0001] The invention relates to a physical simulation method, in particular to a physical simulation method for coal bed gas well hydraulic fracturing that can comprehensively monitor the generation and extension process of cracks. Background technique [0002] At present, my country's coalbed methane resources are abundant, and at this stage, my country's coalbed methane industry is gradually moving from theoretical research to commercialization. However, due to the complex geological conditions of coal fields in my country, the permeability of coal reservoirs is generally low. Therefore, when coalbed methane is exploited, it is often necessary to increase the production of coal reservoirs. At present, hydraulic fracturing is the most widely used and most effective, but people's understanding of fracturing fractures is still relatively low. Laboratory simulation of fracturing is an important means to understand the law of fracturing fracture extension, and...

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Problems solved by technology

[0005] In order to solve the problem that the existing physical simulation method cannot comprehensively detect the extension process of the fracture, the present invention provides a physical simulation method for hydraulic fracturing of coalbed methane wells, the simulation method With the help of the acoustic emission receiver to diagnose the location of the fracture point inside the object, and with the indication of the fluorescent powder, it is possible to monitor the extension process of the internal cracks in the fracturing test piece in real time during the hydraulic fracturing simulation process, and open the test piece after fracturing. The final shape of the fractures can be observed in order to analyze the law of fracture extension in the process of hydraulic fracturing of coalbed methane wells. During the physical simulation of hydraulic fracturing in the laboratory, the generation and expansion of cracks in the test piece can be monitored in real time. The three-dimensional feature analysis is not limited to the observation of the fracture extension on the surface of the fracturing specimen, and better reflects the process of fracture extension

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