水基钻井液降滤失剂HRS的制备与性能研究

Preparation and Properties of High Temperature Water Base Drilling Fluid Filtrate Reducer HRS

张龙军 彭 波 林 珍 袁秋月

ZHANG Long-Jun PENG Bo LIN Zhen YUAN Qiu-Yue

淀粉与丙烯酰胺在硫酸铈铵/过硫酸钾氧化还原引发剂作用下反应得到淀粉丙烯酰胺接枝物，再添加一种抗氧剂复配制备了水基钻井液降滤失剂HRS，研究了HRS在盐水浆中不同温度下的滤失性能、在不同温度下的抗钙、抗镁能力及产品的生物毒性和生物降解性。研究结果表明：产品在150℃使用环境中抗盐至饱和，抗Ca2+至2300 mg/L，抗Mg2+ 900 mg/L。此外,HRS低毒易降解。

The AM/Starch graft copolymer was synthesis using the ceric ammonium sulfate/potassium persulfate redox system, and then the antioxidant was added to prepare the HRS as the water-based drilling fluid filtrate reducer. The properties of HRS were evaluated in laboratory. The experimental results showed that HRS had excellent capacities of depressing the filter loss, thermal stability, saturated-salt resistance. At the high temperature of 150℃, HRS could be used in the operating environment that the maximum content of Ca2+ and Mg2+ was 2300 mg/Land 900 mg/L, respectively. In addition, HRS had microbial toxicity and was easy to be biodegradated.