Drag reducing agent for shale gas slick water fracturing and preparation method thereof

Abstract

The invention relates to a resistance reducing agent for fracturing quick water of a shale gas and a preparation method thereof. The resistance reducing agent for fracturing quick water of the shale gas is formed by reverse emulsion polymerization by means of combination of a water phase and an oil phase, wherein the weight part ratios of monomers to water in the water phase are sequentially as follows: the ratio of acrylamide: 2-acrylamide-2-methyl propanesulfonic acid: water is (0.7-1.3):(0.7-1.5):1; the weight ratio of monomers to oil in the oil phase is sequentially as follows: the ratio of tween 80:OP-10: white oil is (0.1-0.35):(0.1-0.35):1; and the weight ratio of the water phase to the oil phase is 1:(0.35-0.85). The preparation method comprises the following steps: (1) selecting acrylamide and 2-acrylamide-2-methyl propanesulfonic acid, and dissolving acrylamide and 2-acrylamide-2-methyl propanesulfonic acid in proportion in deionized water to prepare the water phase; (2) selecting tween 80 and white oil and mixing the tween 80 and white oil in a certain proportion to form the oil phase; (3) proportioning the water phase and the oil phase in a certain proportion, and fully mixing to form a stable water-in-oil inverse emulsion base fluid; and (4) catalyzing and initiating by an initiator to synthesize the resistance reducing agent.

Description

technical field [0001] The present invention relates to the preparation of a drag reducing agent for shale gas slick water fracturing, more specifically, to a water-in-oil polymer emulsion drag reducing agent and a preparation method thereof, the polymer emulsion prepared by the method, It can quickly achieve phase inversion in water and dissolve in water. The slippery water with this polymer emulsion as drag reducing agent has the characteristics of high temperature resistance, low friction, low expansion, low damage, easy flowback, stable performance and fast dissolution speed. . Background technique [0002] With the exploration and development of unconventional oil and gas reservoirs, due to the particularity of the reservoir, the fracturing fluid required in the corresponding fracturing stimulation will be different. Tight shale gas reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most shale gas wells requ...

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Problems solved by technology

After the overly stable water-in-oil emulsion is mixed with water, it is difficult for the polymer to dissolve from the water phase droplets, and it is necessary to separate the water-soluble polymer from the emulsion by sedimentation, resulting in unnecessary waste in production

In order to solve the stability problem of the water-in-oil emulsion, Nitto Chemical Industry Co., Ltd. discloses a polymer emulsion preparation method that can quickly perform phase inversion in water and thus realize rapid dissolution in Chinese patent CN1052869A. However, the emulsion There are phosphorus-containing emulsifiers in the product, long-term use can cause environmental problems of eutrophication in the water system

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