聚丙烯酰胺
溶解
减速器
方解石
油页岩
水力压裂
化学工程
减水剂
材料科学
石油工程
化学
矿物学
地质学
复合材料
废物管理
水泥
工程类
机械工程
作者
Yukun Ji,Caitlin Walkinshaw,Grace Belshaw,Veerle Vandeginste
标识
DOI:10.1016/j.jngse.2020.103770
摘要
Hydraulic fracturing is widely used to create cracks and increase the size and connectivity of existing fractures, leading to higher permeability of shale rocks and production of unconventional hydrocarbon sources. The main chemicals used in hydraulic fracturing fluids can initiate fractures in shale reservoirs by acid induced carbonate dissolution, and minimise energy loss during the pumping process by friction reducer enhanced fluid viscosity. Here, using batch reactor experiments we investigate the effect of non-ionic polyacrylamide polymer (friction reducer) on the dissolution rate of calcite in acidic solutions (0.2 M buffer solution of sodium acetate/acetic acid) at 25 °C. The results demonstrate that polyacrylamide (from 0 to 30 mg) slows down the dissolution rate by a factor of 4. Hydrogen bonding and surface complexation between non-ionic polyacrylamide and calcite potentially trigger an adsorption mechanism that protects calcite from dissolving. This research provides new insights into friction reducer (polyacrylamide) influenced pore generation, enabling engineers to optimise the fracturing fluid design (amount of polyacrylamide) and to consider suitable actions to prevent the polymer from having a negative impact on productivity.
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