Acid fracturing liquid continuous blending supply device

Abstract

The invention discloses an acid fracturing liquid continuous blending supply device which comprises a clear water input unit, a first blending unit, a whole blending unit and a liquid sending unit. The clear water input unit is used for feeding clear water in a quantifying mode at a constant speed. The first blending unit is connected with the clear water input unit and is used for blending thickening agents and clear water from the clear water input unit, so that a thickening agent pre-blending solution is obtained. The whole blending unit is connected with the first blending unit and is used for blending the thickening agent pre-blending solution, acid liquid and various liquid additives, so that acid fracturing liquid is obtained. The liquid sending unit is connected with the whole blending unit and is used for discharging the acid fracturing liquid from the whole blending unit. According to the blending device, continuous blending supply of water, acid liquid, dry powder or pasty fluid and various liquid additives can be achieved, blending effect is good, blending is even, acid liquid quality is high, in addition, a large amount of manual cost is reduced through a continuous automatic acid preparing device, the requirement for an acid storage tank is lowered, construction liquid is saved, and equipment cost is saved.

Description

technical field [0001] The invention relates to the technical field of liquid preparation technology for acidizing fracturing construction in oil and gas fields, in particular to a continuous mixing and supplying device for 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 invo...

AI Technical Summary

Problems solved by technology

There are many problems in this method, mainly as follows: (1) Due to the large demand for acidizing fracturing fluid, intermittent dosing requires a large number of acid storage tanks, and the cost of fracturing equipment is high; (2) The acid 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 dispensing method has gradually been unable to meet the production requirements of acid fracturing. At present, there is no such practical acid fracturing fluid continuous mixing and supplying device in China.

Images