Drag reducer for shale gas fracture and preparation method of drag reducer

TLDR: In this article, a drag reducer for shale gas fracture and a preparation method of the drag reduction was proposed. But the performance of the proposed drag reduction has not yet been evaluated.

Abstract: The invention relates to a drag reducer for shale gas fracture and a preparation method of the drag reducer. The drag reducer comprises the following components in percent by mass: 20-35 percent of water-soluble high-molecular polymer, 1-5 percent of stabilizing agent, 20-30 percent of inorganic phase-splitting agent, 0.01-0.1 percent of chelating agent, 0.5-2 percent of cosolvent and the balance of water; the water-soluble high-molecular polymer is prepared by carrying out random copolymerization on three monometers, namely free radical initiated acrylamide, 2-acrylamido-2-sodium methallylsulphonate and sodium acrylate and has the molecular weight of between 6,000,000-10,000,000; and the stabilizing agent is formed by copolymerizing the 2-acrylamido-2-sodium methallylsulphonate and the sodium acrylate and has the viscosity average molecular weight of between 100,000-500,000. According to the drag reducer, the functional monomers are introduced on the basis of the conventional polyacrylamide, and therefore the anti-shearing performance of the drag reducer in a pipeline is improved; and the drag reducer has the characteristics of no organic solvent existence, high dissolution speed and high drag reduction rate and is free of fungicides, thereby being economic and environment-friendly.