Flow improver for shale gas reservoir fracturing and preparation method thereof

Abstract

The invention relates to a flow improver for shale gas reservoir fracturing and a preparation method thereof in the development of shale gas reservoir. The invention provides a flow improver with high resistance reducing efficiency, strong high-temperature resistance and salt tolerance and small dosage. The technical scheme is as follows: the flow improver is a copolymer prepared by polymerizing acrylamide with dimethyl allyl octadecyl ammonium chloride and including with hydroxypropyl cyclodextrin, and the ingredients and contents of raw materials used for preparing the flow improver are as follows: 6.95g of acrylamide, 0.56g of dimethyl allyl octadecyl ammonium chloride, 36g of hydroxypropyl cyclodextrin, 1g of ethanol, 5ml of ammonium persulfate solution and 10g of water. The preparation method comprises: firstly mixing an acrylamide aqueous solution with a dimethyl allyl octadecyl ammonium chloride solution, adding an initiator, filling nitrogen to remove the oxygen, reacting at 45 DEG C for 18hours to obtain a binary polymer, adding the hydroxypropyl cyclodextrin, and stirring the mixture at 60 DEG C for 18hours to obtain the flow improver. The flow improver has the stick-slip property of a polymer and the assembly and disassembly property of a cationic surface active agent.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows creating hydrocysteine (HC) based on an organosilicon monomer called Acryloyldimethyltridectrolyte(AZT)) that can be used during oil well drilling operations without causing damage. It also includes two types of bifunctional copolymers - one containing both AZT and DMAE polyeletherapyene derivative (PEG). These compositions have good sticking characteristics at high temperatures while still being able to break through small porous passages like those found near water floors due to their ability to form micelles inside themselves. When these materials come into contact with certain substances such as saltwater they separate out and return back together again after breaking up over time by attaching them onto other particles attached to each particle's surfaces.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance and effectiveness of hydraulically induced wellbore fluid loss (HF) treatments during drilling operations due to poor water-cement bonding properties between different materials like clay mineral particles and rocks underground. Current methods involve adding chemical agents called breakers to improve their strength against these interactions, leading to increased costs associated therewith. Additionally, current techniques require expensive equipment and complicated procedures, making them difficult to use at home without causing harm to nearby areas.

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