Anti-water-locking easily-dissolved alcohol-based fracturing fluid and preparation method thereof

Abstract

The invention discloses an alcohol-based fracturing fluid capable of preventing water locking and easy to dissolve and a preparation method of the alcohol-based fracturing fluid, overcomes the defects that a conventional emulsion thickening agent system fracturing fluid is poor in high-temperature resistance and high-salt resistance, and also overcomes the defects that a conventional powder thickening agent fracturing fluid system is slow in dissolution and cannot be continuously mixed for construction. According to the specific technical scheme, the method comprises the following steps: adding the suspension stabilizer into the waterproof locking agent, performing stirring until the suspension stabilizer is completely dissolved, then adding the phase inversion agent, performing uniform mixing to prepare a suspension base solution, then adding the defoaming agent and the main agent polyacrylamide polymer powder into the suspension base solution, and performing uniform stirring at a high speed to obtain the waterproof locking alcohol group fracturing fluid. The preparation process is simple and rapid, and the quick-dissolving fracturing fluid is instant, does not need to be prepared in advance, is suitable for large-scale on-site fracturing, has the properties of temperature resistance, salt resistance and easiness in flowback, and can meet the fracturing construction requirements of tight gas reservoirs with low porosity, low permeability, high water saturation and the like.

Description

technical field [0001] The invention belongs to the field of oil and gas field exploitation, and in particular relates to a water-proof lock easily soluble alcohol-based fracturing fluid and a preparation method thereof. Background technique [0002] my country has relatively abundant low-permeability oil and gas reservoirs. During the production of oil and gas fields, with the injection of foreign fluids such as drilling fluid, completion fluid and fracturing fluid into the reservoir, it will cause capillary force self-absorption and liquid phase retention, causing The phenomenon that the reservoir water saturation increases continuously while the permeability decreases continuously is called water lock phenomenon. After many oilfields have been exploited many times, the water content of the reservoir is high, which makes it very difficult for the oilfield to be exploited. Water lock damage will have a serious impact on the reservoir, resulting in a decline in the production...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is mainly to provide a fracturing fluid for the problems that the existing polyacrylamide powder and emulsion fracturing fluid cannot meet the construction requirements of large displacement in deep wells, and cannot eliminate the water lock damage caused by the fracturing fluid to the reservoir. Specific preparation method of new waterproof and fast-dissolving alcohol-based fracturing fluid

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