Staged fracturing or synchronous fracturing simulation experiment method for shale horizontal well

Abstract

The invention provides a staged fracturing or synchronous fracturing simulation experiment method for a shale horizontal well. The method comprises the following steps: (a) the natural fracture morphological characteristics of shale in a stratum to be simulated are analyzed; a shale outcrop material for producing a simulation test piece is selected, and the shale material is machined to a cube rock mass according to the shale settled layer characteristics; and the surface of the mass is brushed with resin adhesive for sealing; (b) a through hole is drilled in the middle of the test piece; and when the synchronous fracturing of the horizontal well is simulated, two equal holes are drilled; (c) silent crushing agent slurry filling sections are added in the drill holes; and the needed number of fracturing sections is produced by partition pieces; and (d) the simulation fracturing experiment is performed by using the simulation test piece; and fracture morphology image information in a rock core is obtained after the experiment. For brittle shale with natural fracture development, the method is easy to realize the experimental simulation of staged fracturing or synchronous fracturing of the horizontal well. Meanwhile, the high-energy CT scanning is performed for the test piece through a linear accelerator nondestructive testing system to realize precise observation of a shale fracturing net. The experiment method can be applied to the research on propagation rules of the shale fracturing net under the effect of matrix pressure transfer.

Description

Technical field [0001] The invention relates to a volume fracturing stimulation technology for shale gas reservoirs, in particular to a shale horizontal well staged fracturing or synchronous fracturing simulation experiment method. The invention provides technical support for studying the propagation law of fracture network in shale horizontal wells. Background technique [0002] Shale gas reservoirs are characterized by low porosity and low permeability. If volume fracturing is not implemented to form a large-scale fracture network zone, which provides sufficient flow channels for shale gas, it will be impossible to obtain production and ideal production. Yield. The current shale gas production technologies mainly include horizontal well staged fracturing technology, slick water large-scale fracturing technology and synchronous fracturing technology. The effective implementation of these advanced technologies has greatly increased the production of shale gas wells. [0003] Hori...

AI Technical Summary

Problems solved by technology

[0007] In addition, after shale fracturing, a large number of complex and intertwined micro-fractures will be formed. It is difficult to identify the complete fracture network shape by conventional tracers (dyeing agents), and it is difficult to distinguish hydraulic fractures from natural fractures.

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