Perforating and fracturing method with effect of increasing modification degree of tight oil horizontal well

Abstract

The invention provides a perforating and fracturing method with an effect of increasing modification degree of a tight oil horizontal well. The method comprises steps as follows: the perforating position of each section is selected, perforating is performed on each section for N clusters, and length of a perforating section of each cluster and the number of perforations are optimized; a drift sizegauge tool is adopted to perform drifting to reach artificial well bottom of an operating well; a first section of the horizontal well is subjected to multi-cluster perforating, and fracturing construction is performed with a multi-cluster fracturing technology; first-stage prepad fluid and sand-carrying fluid are pumped, the number of effectively fractured perforated clusters at the well bottomis judged according to the characteristic of wellhead pressure, if part of the clusters are not fractured, degradable resin is pumped by the fracturing fluid, a temporary plugging effect is judged according to the pressure characteristic of the degradable resin entering a crack seam, and a corresponding measure is adopted; a bridge plug and a perforating tool are hydraulically pumped, and packingof an operated well section and perforating of a to-be-operated well section are realized; all sections of the operation well are fractured finally. According to the method, effectiveness of multi-cluster crack seams in the sections can be effectively improved, production and recovery percent per well are increased, and the method has broad application prospect in the aspect of yield increase andstabilization of an unconventional oil-gas horizontal well.

Description

technical field [0001] The invention relates to the field of oil recovery engineering, in particular to a perforation and fracturing method for improving the stimulation degree of tight oil horizontal wells. Background technique [0002] In recent years, the "horizontal well segmented multi-cluster volumetric fracturing" method has become an effective means to develop tight oil. Simultaneously fracturing. Firstly, the perforation clusters are selected according to the interpretation results of reservoir logging. There are 4 to 6 perforation clusters in each section. When implemented on site, the bridge plug and the perforating gun are combined as a drilling tool to be lowered to the predetermined position through hydraulic pumping or coiled tubing. After the bridge plug is seated and released, it is separated from the perforating gun and the perforating gun is lifted to the perforating position. According to the design, multi-cluster perforation is carried out, and low-vis...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a perforation and fracturing method to improve the degree of stimulation of tight oil horizontal wells to solve the problem that the probability of multi-cluster fractures opening and effective support in the existing horizontal well section is too low, resulting in a lower single well production than the design expectation The problem

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