Fracturing method for increasing fracture forming height during shale gas multi-cluster perforation

Abstract

The invention discloses a fracturing method for increasing fracture forming height during shale gas multi-cluster perforation. The method comprises the steps of (1) evaluating key shale parameters; (2) calculating comprehensive sweet spots and determining the position of a segment cluster; (3) optimizing fracture parameters; (4) optimizing fracturing construction parameters; (5) carrying out bridge plug and perforation combined operation construction; (6) carrying out acid pretreatment operation; (7) carrying out high-viscosity and high-displacement fracture forming construction; (8) carryingout low-viscosity slick water continuous fracture forming construction; (9) carrying out low-viscosity fracturing fluid continuous sand adding construction; (10) removing the medium displacement of the viscosity fracturing fluid in the step (9) to remove the fracture channel partially blocked by the propping agent in the step (9); (11) carrying out medium-density 70-140-mesh propping agent construction by the viscosity slick water; (12) carrying out medium-density 40-70-mesh propping agent construction by the viscosity slick water; and (13) carrying out medium-density 30-50-mesh propping agentconstruction by the viscosity glue solution. According to the method, the fracture transformation volume can be improved, the yield increasing effect is more obvious, and the production potential ofthe shale gas reservoir is better excavated.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, and more specifically, relates to a fracturing method for increasing the height of fracture creation during multi-cluster perforation of shale gas. Background technique [0002] At present, for shale with high brittleness, the method of multi-cluster perforation in a section is generally adopted, from 2-3 clusters commonly used in the past to 3-4 clusters or even 3-6 clusters. However, after the number of clusters increases significantly, the displacement generally does not increase. Therefore, a large decrease in the displacement of a single cluster of perforations will inevitably lead to a decrease in the height of fracture creation, and a decrease in the height of fracture creation will inevitably lead to effective reconstruction of fractures. Therefore, the increase in the number of clusters in the segment originally hoped to increase the volume of fr...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the height of the fractures is difficult to increase when multi-cluster perforation is performed in the shale gas fracturing section, which leads to the difficulty in increasing the volume of fracture stimulation, and proposes a fracturing method for increasing the height of fracture creation during multi-cluster perforation of shale gas method