A method of using differential pressure polymerization temporary plugging agent to realize temporary plugging diversion to fracturing

Abstract

The invention discloses to a method for utilizing a differential-pressure polymerized temporary plugging agent to achieve temporary plugging steering fracturing. The method includes the steps of according to the formation pressure coefficient, reservoir temperature, pressure and depth of a target well reservoir, determining the type of temporary plugging steering agents first; secondly, accordingto the number of pore passages, setting the addition quantity of the temporary plugging steering agents; on the premise of already pressing cracks to open, adding the powdery differential-pressure polymerized temporary plugging agent and a granular temporary plugging agent into quick water or a guanidine gum-based liquid, using the quick water or the guanidine gum-based liquid for applying a temporary plugging liquid in place, and observing and recording the change of oil pressure in the whole process; judging the construction effect of temporary plugging steering fracturing by analyzing a fractured crack monitoring graph and the layer position and direction of a new unfolded crack. Through combined usage of the powdery differential-pressure polymerized temporary plugging agent and the granular temporary plugging agent, original cracks are effectively sealed, the pressure bearing capability of the cracks is improved, the area of crack control is enlarged, and meanwhile, through steering among clusters and steering in the cracks, the complexity of the cracks is increased. A volume fracturing effect by which main cracks and natural cracks are communicated with each other is achieved,and the purpose of increasing the yield of an oil / gas well is achieved at last.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and relates to a temporary plugging and diversion link in oil and gas field fracturing construction, in particular to a method for realizing temporary plugging and diversion to fracturing by using a differential pressure polymerization temporary plugging agent. Background technique [0002] The stimulation of low-porosity, low-permeability, and tight oil and gas reservoirs needs to create long fractures and complex fractures to achieve the effect of SRV volume stimulation, in order to significantly increase productivity. A large number of production logging and downhole imaging data at home and abroad show that during the conventional fracturing of multi-cluster perforated horizontal wells, the difference in fluid inflow between clusters is large, resulting in a considerable part of the perforated clusters in the horizontal well section not being fractured, and the geological reserves ...

AI Technical Summary

Problems solved by technology

[0004] 1. Separation of bridge plugs in the casing, a multi-cluster perforation fracturing well, general fracturing (limited flow fracturing method) will easily lead to excessive fracturing in high-grade areas of the reservoir, and the length of single cluster fractures is too long, resulting in inter-well fractures. interference without sufficient stimulation of secondary fracture zones;

[0005] 2. Casing deformed wells cannot be run into segmented tools;

[0006] 3. In the limited sections of open hole wells, the initiation position of artificial fractures is often controlled by the seal of the packer (the stress change point caused by expansion), which causes fractures to initiate at undesired positions, and the actual fracture distribution Often inconsistent with the design, seriously affecting the effect of increasing production;

[0007] 4. Conventional staged fracturing can only produce high-level intervals with good physical properties and low stress, while low-level intervals are difficult to open;

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