A kind of nanoscale Pickering emulsion type fracturing fluid and its preparation method

Abstract

The invention provides nanoscale Pickering emulsion type fracturing fluid and a preparing method thereof. The method includes the steps that a water-soluble monomer, two functional monomers, water-soluble polymeric emulsifier and inorganic salt are mixed and dissolved in deionized water to form a water phase; oil-soluble emulsifier and oil are mixed to form an oil phase; the water phase and the oil phase are mixed and heated, nitrogen is introduced, nano particles and an initiating agent are added to initiate polymerization, high-speed dispersion is combined with high-pressure homogenization or high-pressure microjet to disperse a mixed solution into dispersion fluid, the dispersion fluid is diluted to prepare the nanoscale Pickering emulsion type fracturing fluid. The fracturing fluid has good capacity of reducing resistance, aiding discharge, stabilizing clay, suspending sand and reducing surface activity, can effectively reduce usage of clay stabilizer and a discharge aiding agent, reduces operation cost, shortens work time and improves the fracturing efficiency. The stability of the fracturing fluid is effectively improved by the introduced nano particles.

Description

technical field [0001] The invention belongs to the field of oil field exploitation, and in particular relates to a nanoscale Pickering emulsion type fracturing fluid suitable for gas reservoirs in tight oil fields and a preparation method thereof. Background technique [0002] Tight unconventional reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most tight oil and gas wells require reservoir reconstruction to obtain ideal production. With the upsurge in the exploitation of unconventional oil and gas resources, the slickwater fracturing technology suitable for the exploitation of unconventional reservoirs such as low permeability and low porosity has been increasingly popularized. Since the first tight gas well located in Texas was successfully transformed by using the slick water fracturing system in the United States in 1997, the slick water fracturing system has attracted much attention and has become an unco...

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Problems solved by technology

For example: the solid content of aqueous solution is generally low, and the molecular weight is not easy to control, and the transportation cost is high; the powder needs to be dried by a large amount of heat and requires special drying equipment, and high-speed stirring and heating are required when used, which is time-consuming and labor-intensive; "Water" emulsion is to disperse water-soluble polyacrylamide in oil (hydrocarbon), not only to have higher effective product content, higher product molecular weight, but also to have long-term storage stability, and at the same time meet the above Applying requirements is not an easy task

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