Anti-high salt drag reducer and preparation method thereof

Abstract

The invention discloses an anti-high salt drag reducer. The drag reducer comprises the following raw materials, by mass percent: 15-25% of acrylamide, 3-5% of polyvinylpyrrolidone, 5-10% of 2-acrylamide-2-methylpropanesulfonic acid, 15-20% of acrylic acid, 1-3% of ammonium sulfate, 2-6% of sodium hydroxide, 1-3% of calcium chloride, 11-14% of an emulsifier, 5-7% of an oil-phase solvent, 5-7% of a gel breaker, and 10-40% of deionized water. The preparation method of the invention strictly controls the proportion of the components of the anti-high salt drag reducer and preparation process parameters, adopts the acrylamide, polyvinylpyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, ammonium sulfate, sodium hydroxide calcium chloride, emulsifier, oil-phase solvent, gel breaker and deionized water as the raw materials of the preparation, and controls the mass percent of the amount of the emulsifier to be 11-14%. The drag reduction ratio of the drag reducer is 78.38%, the kinematic viscosity of the solution is 3.4 mpa.s, and the viscosity retention rate in a saline solution of 100 mg / L is 75.9%. The anti-high salt drag reducer has a good salt resistance effect, has temperature resistance of above 200 DEG C, is wide in application range, and is suitable for wide application.

Description

technical field [0001] The invention relates to the technical field of shale gas, in particular to a high-salt resistance drag reducer, and at the same time, the invention also relates to a preparation method of a high-salt resistance drag reducer. Background technique [0002] Shale gas is natural gas that exists in the free form in shale pores and natural fractures, and in the adsorbed state on the surface of kerogen and clay particles. The permeability of shale gas reservoirs is very low, especially the matrix permeability of deep gas-producing shale is usually measured in Nadarcy, the permeability level of shale gas reservoirs is 0.000001md, Nadarcy Nano-darcy, And high-quality shale gas reservoirs are only 300-500 Nadarci. [0003] The drag reducing water fracturing technology for ultra-low porosity and ultra-low permeability unconventional reservoirs has been popularized and applied. The drag reducing agent is used as the core additive in the drag reducing water fract...

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Problems solved by technology

[0003] The drag reducing water fracturing technology for ultra-low porosity and ultra-low permeability unconventional reservoirs has been popularized and applied. The drag reducing agent is used as the core additive in the drag reducing water fracturing system. The drag reducing rate and The kinematic viscosity is not ideal, and the salt resistance effect and high temperature resistance are not good, so it is difficult to meet the use in special environments such as high salt and high temperature.

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