Formulated fracturing fluid of micro emulsion gel

Abstract

The invention provides a formulated fracturing fluid of micro emulsion gel and a proportion thereof, the formulated fracturing fluid of micro emulsion gel comprises the following components by weight percent: 3.8 to 16.7 percent of micro emulsion system, 0.1 to 0.5 percent of polymer, 0.25 to 1.20 percent of cross linking agent, 0.05 to 0.60 percent of gel breaker, 0.05 to 0.10 percent of heat stabilizer and 80.90 to 95.75 percent of water, wherein the micro emulsion system consists of kerosene, compound surfactant, low-molecule alcohol and water, and the polymer is guar gum. By utilizing thesynergistic effect of the micro emulsion and gel, the formulated fracturing fluid of micro emulsion gel is characterized by low content of polymer, high viscosity, low filtration, low content of polymer residual in solution after gel breaking, micro emulsion status of the system after gel breaking, lower surface tension, good suspending power and the like, can greatly reduce flow-back pressure and damage to reservoir, and improve the fracture flow capacity and crude output.

Description

technical field [0001] The invention relates to a fracturing fluid, specifically, a fracturing fluid formed by compounding microemulsion and gel. Background technique [0002] Fracturing is a widely used measure to stimulate production and injection in oilfields to stimulate oil layers. Fracturing fluid is the working fluid in the process of fracturing oil and gas reservoirs. It plays the role of transmitting pressure, forming formation fractures, and carrying proppant into fractures. To a certain extent, the performance of fracturing fluid becomes the decisive factor for fracturing effects. The key factor. At present, the commonly used fracturing fluids in oil fields include polymer solution fracturing fluid, gel fracturing fluid, foam fracturing fluid and viscoelastic surfactant fracturing fluid, etc. The first three fracturing fluids all have the disadvantages of large polymer residue and fluid loss, which greatly damage the permeability of the reservoir and diversion s...

AI Technical Summary

Problems solved by technology

The first three fracturing fluids all have the disadvantages of large polymer residue and fluid loss, which greatly damage the permeability of the reservoir and diversion section; although the viscoelastic surfactant fracturing fluid does not contain polymers, the fracturing effect is also low. Good, but there are also defects of large filtration loss and relatively high cost

The above-mentioned fracturing fluids generally have problems such as high flowback pressure, incomplete flowback, and great damage to the permeability of the reservoir and diversion section.

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