Integrated composite emulsion type clean fracturing fluid capable of being blended on line and preparation method thereof

Abstract

The invention provides an integrated composite emulsion type clean fracturing fluid capable of being blended on line and a preparation method thereof. A low-concentration emulsion thickening agent which has good resistance reduction performance and cross-linked rubber which is formed by cross-linking of a high-concentration emulsion thickening agent and has good sand-carrying performance are utilized for preparing the integrated composite emulsion type clean fracturing fluid capable of being blended on line. The system is characterized in that the low-concentration emulsion thickening agent isadopted to prepare slick water, the high-concentration emulsion thickening agent is adopted to prepare linear rubber, and the linear rubber is combined with a cross-linking agent to form the cross-linked rubber, thereby realizing multi-purpose effects of one emulsion thickening agent. Compared with the existing composite fracturing fluid, the integrated composite emulsion type clean fracturing fluid system capable of being blended on line, provided by the invention, has the advantages that the formula is simple, the types of additives are few, continuous blending can be realized under the condition that the fluid does not need to be prepared in advance during construction, the quantity of on-site fluid storage tank groups is reduced, and fluid preparation processes can be simplified and alot of cost can be saved during fracturing construction. Other properties of the system are not weaker than those of existing other products.

Description

technical field [0001] The invention relates to the technical field of oil and gas field reservoir transformation, in particular to an integrated composite emulsion type clean fracturing fluid capable of being mixed online and a preparation method thereof. Background technique [0002] Unconventional oil and gas resources such as shale gas at home and abroad are abundant, but most of them are low and ultra-low permeability oil and gas reservoirs, so fracturing must be carried out to increase oil and gas production. Fracturing is a technological process to modify the seepage characteristics of oil layers, and it is an important technological measure for increasing the production of oil and gas wells and increasing the injection of solvent injection wells. Fracturing fluid is the main fluid in reservoir stimulation. The performance of the fracturing fluid directly affects the fracturing effect and the injection-production capacity of the well. The existing fracturing fluid s...

AI Technical Summary

Problems solved by technology

The existing fracturing fluid system is composed of guar gum pressure fluid and artificial polymer fracturing fluid. The fracturing fluid is generally composed of reducing water and jelly fracturing fluid. The reducing water fracturing can form complex fracture network, but the support If the concentration of the agent is low, the conductivity of the formed fractures is poor, and the gel fracturing fluid has a strong sand-carrying ability, but the viscosity of the system is high, and the construction friction is high

[0003] At this stage, the additives of the water-resistance-resistance and jelly fracturing fluids are different, and in order to meet the different needs of the reservoir, there are many types of additives, and it is difficult to control the quality of each additive. At the same time, it is necessary to Prepare the water resistance and gel fracturing and store it in the liquid storage tank. The liquid preparation process is also complicated and requires a lot of manpower, material resources, and financial resources. This process is not conducive to the "industrialization" of shale gas platform wells. "Operation

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