A multi-lithologic fracturing fracture test method

Abstract

The invention discloses a multi-lithologic fracturing crack test method, which includes the following steps: (1) rock matrix production: according to different rock mechanical parameters, the mass ratios of cement, quartz sand and water are prepared to simulate shale respectively. , cuboid sheet of coal rock and limestone; (2) simulation of fracture system: in the process of making rock sheet, the pre-set paper sheets are used to simulate coal rock, shale bedding and coal rock cleavage; (3) sample combination; ( 4) Sample drilling: According to the characteristics of the horizontal well and vertical well, drill a counterbore with a length of 16 cm and a diameter of 14 mm on the surface of the sample along the direction parallel or perpendicular to the bedding, cement the simulated wellbore, and reserve the lower part. 2cm open-hole section; (5) select the type of proppant; (6) perform the Gaza process; (7) evaluate the conductivity of the proppant. Therefore, the present invention is a simulation method capable of quantitatively and accurately predicting the true propagation trajectory of the staged fracturing fractures in horizontal wells.

Description

technical field [0001] The invention relates to the field of oil and gas reservoir development, in particular to a multi-lithologic fracturing fracture test method. Background technique [0002] The physical simulation of fracturing is an important laboratory method to analyze the geometry and extension process of fracturing fractures reliably and effectively. However, there is no physical simulation method of fracturing for coal-measure composite reservoirs in multi-coal seam areas. [0003] And in the existing mining process, coal-measure composite reservoirs generally have the characteristics of low porosity and low permeability. Compared with conventional single lithologic reservoirs, coal-measure composite reservoirs have distinct geological characteristics, and the lithologic combination styles are diverse and complex. In particular, the rock mechanical properties and interlayer interface properties of different types of reservoirs are significantly different, which af...

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Problems solved by technology

[0007] To sum up, there are currently coexisting wells with various lithologies such as shale, coal rock, and sandstone, and multi-lithology fracturing fractures may expand in the multi-gas co-production system. Therefore, it is necessary to establish a multi-lithology fracturing fracture system , to solve the technical problem that the coal-measure composite reservoir is deeply buried underground, so that the geometry and extension of fractures cannot be directly observed

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