Three-step control method for improving shale modification volume

Abstract

The invention discloses a three-step control method for improving shale modification volume. The method comprises the steps: evaluating key reservoir parameters, determining construction geological conditions, optimizing fracture parameters and fracturing construction parameters, and determining perforation positions and perforating operations. The method is characterized in that the low viscositysliding hydraulic fracturing construction is adopted in the whole process, and step lifting displacement, step lifting sand ratio and step grain diameter combined sand adding are carried out in the construction process. The method has the advantages that the sand adding amount, the reconstruction strength and the flow guiding capacity of the fracture of a shale gas single well are greatly improved, the purposes of improving the complexity of the fracture of deep shale gas and maximizing the effective reconstruction volume are achieved, and accordingly the fracturing yield increasing effect and the economic development value are improved.

Description

technical field [0001] The invention relates to a shale gas volume fracturing method, in particular to a three-step control method for increasing the volume of shale stimulation. Background technique [0002] Shale gas volume fracturing has been carried out in China for many years in theoretical research and field tests. The development of stage fracturing tools, post-fracturing flowback, and post-evaluation research are basically mature and complete; at present, shale production is low after gas pressure and declines rapidly, and it is difficult to obtain economic development value. From a technical point of view, the difficulty The main manifestations are: [0003] 1) With the increase of burial depth, the three-dimensional stress increases. Among them, the increase of the two-dimensional horizontal stress difference increases the difficulty of fracture steering and reduces the complexity of fractures; the increase of vertical stress makes horizontal bedding fractures or ...

AI Technical Summary

Problems solved by technology

[0002] Shale gas volume fracturing has been carried out in China for many years in theoretical research and field tests. The development of stage fracturing tools, post-fracturing flowback, and post-evaluation research are basically mature and complete; at present, shale production is low after gas pressure and declines rapidly, and it is difficult to obtain economic development value. From a technical point of view, the difficulty The main manifestations are:

[0003] 1) With the increase of burial depth, the three-dimensional stress increases. Among them, the increase of the two-dimensional horizontal stress difference increases the difficulty of fracture steering and reduces the complexity of fractures; the increase of vertical stress makes horizontal bedding fractures or It is more difficult to open and extend the grain seam, which reduce