A Fracturing Method for Realizing Effective Partial Pressure of Tight Heterogeneous Reservoir

Abstract

A fracturing method for realizing the effective partial pressure of a dense heterogeneous reservoir stratum includes the steps of cutting to an artificial well bottom through a gauge cutter, conducting a pressure test on a shaft after well flushing till the test is qualified, selecting the point with the best physical property of the stratum as a perforation section or spot, conducting heat power perforation or heat power sandblast perforation, putting in a fracture drill tool to conduct first-grade fracturing construction, implementing general fracturing through fracturing liquid, replacing with sand-carrying fluid to enter the stratum, closing a well till a fracturing seam is closed, adding degradable fiber and a water-soluble temporarily plugging agent for blocking a fractured layer section, starting second-grade fracturing construction, repeatedly executing the steps of adding the degradable fiber and the water-soluble temporarily plugging agent and conducting fracturing construction according to the perforation hole number till all perforation sections are sufficiently refitted, and finally conducting well closing, well opening for gushing, production volume finding and well completing. Through the combination of multi-section fixed point perforation and the fiber and the water-soluble temporarily plugging agent, the opened fracturing seam is selectively blocked, an unused stratus is forced to be fractured and a new seam is created, and the aim of effective fracturing and sufficient refitting of all oil reservoirs can be achieved.

Description

technical field [0001] The invention relates to the field of oil recovery engineering, in particular to a fracturing method for realizing effective partial pressure of tight heterogeneous reservoirs. Background technique [0002] With the deepening of oilfield development, non-integrated, heterogeneous Chang 6 and 8 ultra-low permeability reservoirs have become an important field for increasing reserves and production. The tightness of Chang 6 and 8 reservoirs is mainly characterized by thick sand bodies, multiple sets of oil layers superimposed and developed vertically, muddy and calcareous interlayers developed in layers, thin oil layers, poor physical properties, and serious heterogeneity. At present, two methods are mainly used in homogeneous tight oil reservoirs: 1. General combined pressure. This stimulation method often cannot produce well in each oil layer segment. It is difficult to achieve full vertical production in reservoir stimulation, and many thin oil layers ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a fracturing method for realizing effective pressure partial pressure of tight heterogeneous reservoirs. By adopting the fracturing method of "fixed-point perforation, multi-stage fracturing, and temporary plugging between fractures", the interlayer of the reservoir can be improved. The effectiveness of stimulation can not only try to solve the problem of high-efficiency fracturing in reservoirs with strong heterogeneity, but also has reference significance for repeated fracturing of vertical wells and horizontal wells, and multi-cluster perforation fracturing of horizontal wells.

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