Continuous mixing supply method for acid fracturing fluid

Abstract

The invention discloses a continuous mixing supply method for acid fracturing fluid. The method includes the following steps of mixing: feeding a thickener premixed solution, acid fluid and various fluid additives into an integral mixing system for solution mixing so as to obtain the uniformly-mixed acid fracturing fluid, and solution distribution: supplying and discharging the acid fracturing fluid obtained in the mixing step. By the mixing method, continuous mixing supply of water, the acid fluid, dry powder or pasty fluid and the various fluid additives can be realized, mixing effect is good, mixing is uniform, and quality of the fracturing fluid is high; in addition, by realization of a continuous automatic acid preparing process, a large amount of labor cost is reduced, the requirement on a fluid storage tank is lowered, construction fluid is saved, and equipment cost is saved.

Description

technical field [0001] The invention relates to the technical field of fluid preparation technology for acidizing fracturing construction in oil and gas fields, in particular to a method for continuously mixing and supplying acidizing fracturing fluid. Background technique [0002] Acid fracturing is the most effective stimulation measure for carbonatite and complex lithology fractured reservoirs. The quality of acidizing fracturing fluid directly determines the quality of improving formation permeability. The main components of acidizing fracturing fluid include hydrochloric acid, hydrofluoric acid, thickener (polyacrylamide), corrosion inhibitor, drainage aid, surfactant, etc. , in the acidizing operation, it is necessary to mix all the materials evenly in advance, and the key technology restricting the acidizing operation is the continuous mixing of acid liquid. [0003] At present, the mixing of acidizing fracturing fluids adopts the traditional method, which mainly inv...

AI Technical Summary

Problems solved by technology

There are many problems in this method, the main ones are: (1) Due to the large demand for acidified fracturing fluid, intermittent fluid dosing requires a large number of acid storage tanks, and the cost of fracturing equipment is high; (2) The fluid dosing process requires more Manual operation, the labor intensity of the on-site staff is high; (3) The concentrated hydrochloric acid and hydrofluoric acid used in the acid preparation are highly volatile and corrosive, and there are many safety hazards on the site; (4) Due to many Uncertain factors, first dosing and then construction often lead to waste of remaining liquid; (5) The viscosity of the acidified fracturing fluid is high, and it is difficult to transport the acidized fracturing fluid. During the mixing process of the acidified fracturing fluid, the materials are mixed by centrifugal pumps connected through pipelines When circulating in the acidified fracturing fluid tank to achieve uniform mixing between different materials, the composition of the acidified fracturing fluid is complex, and the viscosity, density, and pH value of the materials to be added are all different, especially the viscosity of the thickener is relatively high. It is often impossible to obtain a uniform mixture by using the pump circulation mixing method, and a large amount of high-viscosity acid liquid requires a centrifugal pump with a large displacement and a high lift, which requires a high pump power, so there are high energy consumption, long mixing time, and equipment There are problems such as large investment, continuous mixing cannot be achieved, and high operating costs

[0004] With the development of fracturing technology, the traditional intermittent acid mixing method can no longer meet the production requirements of acid fracturing. At present, there is no such method of continuous mixing and supply of acid fracturing fluid with practical application value in China.

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