Oil field fracturing transformation method

Abstract

The invention provides an oil field fracturing transformation method. The method comprises the steps of selecting oil-driving activated water according to reservoir wettability, utilizing simulation software to work out a fracture spacing of an effective displacement pressure system and a minimum fracture spacing for avoiding stress interference, and combining and optimizing to obtain an optimal fracture spacing; carrying out conventional fracturing transformation on a first section of a horizontal well with adding a support agent, carrying out large-scale oil-driving activated water fracturing transformation on a second section of the horizontal well without adding the support agent, alternatively carrying out the two fracturing processes on follow-up well sections, and after the fracturing is finished, closing the well, and carrying out open flow production after fracture closure. According to the oil field fracturing transformation method provided by the invention, subdivision cutting fracturing transformation and fracturing fracture interval displacement are combined, and traditional interwell long distance displacement is transformed to fracture interval short distance displacement on the same well and same layer, so that the displacement pressure system is favorably built, and the oil recovery ratio can be greatly improved; the usage of the support agent and fracturing fluid gel is greatly reduced, so that the fracturing transformation cost is greatly reduced, and an important method is provided for qualitatively and beneficially developing low-osmolar and compact reserves.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to an oil field fracturing reconstruction method. Background technique [0002] Low-permeability and tight reservoirs have become the most realistic and important oil and gas resource replacement areas in China. Drawing on the North American shale gas "horizontal well + volumetric fracturing" technology, my country has successfully realized The effective development of such tight oil blocks has established a production capacity of 2 million tons. However, the development of such reservoirs faces bottleneck problems such as fast production decline (3-year production decline reaches 85%), low recovery rate (natural energy recovery degree is 5%-8%), and high development cost. [0003] At present, there are three main technical measures adopted for the development of low-permeability tight reservoirs: (1) The development mode of horizontal well staged fracturing combined wi...

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Problems solved by technology

[0005] In order to solve the problem of low recovery rate and high cost of fracturing stimulation in low-permeability and tight reservoirs with no natural fractures, the purpose of the present invention is to provide an oilfield fracturing stimulation method, which can Combined with inter-well energy storage displacement, the traditional long-distance displacement between wells is transformed into short-distance displacement between fractures, so as to realize the integration and synchronization of fracturing-water injection-displacement-oil production in the same well

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