A fracturing method and system based on ultimate flow-limiting design

Abstract

The invention discloses a fracturing method and system based on limit current limiting design. The fracturing method based on limit current limiting design comprises the following steps of: updating the change of a stress field affected by crack propagation in a geological model according to logging data and core test data from the initial moment; calculating the perforating hole friction resistance, the crack interior friction resistance and the crack opening pressure, sequentially obtaining the crack lengths of perforating hole clusters according to the crack size corresponding to each moment, and marking the ending moment of fracturing; obtaining the standard deviation of the crack lengths of all perforating hole clusters at the end of fracturing by adjusting the number of the perforating hole clusters and the number of perforating holes in the fracturing section; and when the standard deviation reaches the standard threshold value, generating a reservoir stratum fracturing scheme according to the number of the perforating hole clusters in the corresponding fracturing section and the number of perforating holes of each perforating hole cluster. The fracturing method and system provided by the invention can obtain the optimized fracturing scheme by adjusting the number of the perforating hole clusters and the number of the perforating holes in the fracturing section, and promote the uniform transformation of multiple clusters of cracks in the fracturing section, expose the production layer to the greatest extent, and improve the development efficiency of a reservoir stratum.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a fracturing method and system based on an extreme flow-limiting design. Background technique [0002] At present, the current-limited fracturing method used in the field of oil and gas exploitation has been proposed for a long time. It can be aimed at vertical wells. According to the difference in opening pressure of multiple reservoirs, the fracturing fluid in the wellbore can be reduced by designing the perforation friction. It entered different reservoirs successively, and finally realized the uniform fracture creation of Duoke reservoir. [0003] For horizontal wells that mainly develop a set of reservoirs, since logging can only obtain geomechanical parameters in the near-wellbore zone, the current perforating method cannot overcome the inhomogeneity in the development of hydraulic fractures in the process of vertical and lateral expansion; an...

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Problems solved by technology

[0003] For horizontal wells that mainly develop a set of reservoirs, since logging can only obtain geomechanical parameters in the near-wellbore zone, the current perforation method cannot overcome the inhomogeneity in the development of hydraulic fractures in the process of vertical and lateral expansion; and Interference between fracture clusters, flow competition and the impact of blasthole erosion in each cluster will aggravate the uneven development of fracture clusters in the fracturing section, resulting in poor exposure of the reservoir and affecting development efficiency

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