Turbid liquid type drag reducer and preparation method and application thereof

Abstract

The invention provides a turbid liquid type drag reducer and a preparation method thereof. The drag reducer is prepared from, by mass, 15-60 wt% of water-soluble high-molecular polymer, 0.3-2 wt% of surfactant, 0.5-5 wt% of thickener and the balance oil solvent. The viscosity of the drag reducer is 50-200 thousand cP. The thickener is selected from one or more of polystyrene-ethylene-propylene, polystyrene-ethylene-butylene, polyethylene, polypropylene, polyurea, polyisoprene, polybutadiene, polystilbene-ethylene-propylene, poly(styrene-butadiene), polymethacrylate, polyisobutene, hydrogenated(styrene-isoprene) copolymer and fatty alcohol. According to the turbid liquid type drag reducer provided by the invention, aiming at polyacrylamide powder with specific dosage and molecular weight,the thickener with specific composition proportion is matched with a surfactant with specific composition and proportion, so that the obtained final drag reducer product has better drag reduction property, salt resistance and storage stability.

Description

Technical field[0001]The application relates to the technical field of oilfield chemicals, and in particular to a suspension liquid drag reducer, a preparation method thereof, and an application in a slick water fracturing fluid.Background technique[0002]Tight shale gas reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most shale gas wells need large-scale fracturing to obtain industrial production value; shale gas horizontal well fracturing is an efficient exploration for shale oil and gas. The key technology and core technology developed, fracturing fluid is an important carrier and realization method of this technology. In recent years, with the continuous improvement of hydraulic fracturing technology and the pursuit of low-cost mining technology, slippery water fracturing fluid has emerged as the times require, and has replaced guar gum fracturing fluid, becoming the most widely used shale gas development operation....

AI Technical Summary

Problems solved by technology

However, for emulsion-like drag reducers, it is usually prepared by direct in-situ synthesis of polymer monomers with the assistance of surfactants. However, on the one hand, the effective content of polymers in such emulsion drag reducers is relatively low (usually 10%~20%), for example patent CN102977877A, CN108727536A and CN106147741A respectively provide the effective content of emulsion drag reducer synthesized with monomers such as acrylamide at about 20%, and because the preparation of the polymer drag reducer of emulsion The limitations of the method (such as the amount of initiator used and the viscosity of the monomer in the water phase after polymerization, etc.) make it difficult to further increase the polymer content in the emulsion drag reducer; on the other hand, it is not formulated into a slippery water emulsion The stability time of the drag reducer at room temperature is short, and it usually delaminates in about 2 months, which greatly reduces its drag reduction ability, which is not conducive to long-term storage and long-distance transportation. If it is directly made into slippery aquatic products, the selectivity is small. It is also not convenient for on-site configuration and use, which limits its application

[0004] As for the powdered drag reducing agent, on the one hand, it is easy to be damp during storage, and it is easy to generate dust during use, causing dust pollution, and at the same time causing harm to the health of the operator; on the other hand, the powder drag reducing agent When the agent is used in the field, the dissolution rate is very slow, and it is easy to produce fish eyes after dissolution, which is not conducive to the drag reduction effect of the drag reducer, which seriously reduces the utilization rate

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