摘要
针对聚合物钻井液的抗钙难题,以分散解絮凝为主要思路,使用2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、对苯乙烯基磺酸钠(SSS)和二甲基二烯丙基氯化铵(DMDAAC)为单体合成了一种抗高温抗钙两性离子聚合物分散剂。对影响聚合反应的关键参数进行了优选,最终将单体物质的量比优选为AMPS∶SSS∶DMDAAC=7.5∶0.5∶2,引发剂K2S2O8加量优选为单体总质量的0.4%。单剂评价结果表明,分散剂能够在高钙且高温的环境中有效分散膨润土,具有降低滤失量与低剪切速率黏度的作用。从分散剂的分子构型入手分析了其作用机理。以分散剂为核心,配伍消泡剂与惰性封堵材料,配制了高钙钻井液。
Calcium contamination presents threats to many polymers used in drilling fluids. Dispersion and deflocculation are generally used to eliminate the detrimental effects of calcium contamination. A high temperature calcium resistant amphoteric polymer dispersant has been developed with 2-acrylamido-2-methylpropane sulfonic acid (AMPS), sodium 4-styrenesulfonate (SSS) and dimethyldiallyl ammonium chloride (DMDAAC). The key factors affecting the polymerization, through optimization, are as follows: molar ratio of the monomers AMPS∶SSS∶DMDAAC=7.5∶0.5∶2, percent mass concentration of the initiator K2S2O8 is 0.4%. Laboratory evaluation results show that this dispersant can be used to disperse bentonite in high temperature high calcium water base drilling fluids, and is able to reduce filtration rate and low-shear-rate viscosity. The mechanism of the dispersant was studied by analyzing its molecular structure. A drilling fluid resistant to contamination of high concentration calcium was formulated with the dispersant as the main additive, combined with other additives such as defoamer and inert plugging agents.
作者
李斌
蒋官澄
贺垠博
LI Bin;JIANG Guancheng;HE Yinbo(China United Coalbed Methane Corporation, Ltd., Beijing 100015;State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249;MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249)
出处
《钻井液与完井液》
CAS
北大核心
2019年第3期303-307,共5页
Drilling Fluid & Completion Fluid
基金
国家“十三五”科技重大专项“复杂结构井、丛式井设计与控制新技术”(2017ZX05009-003)
国家自然基金创新研究群体项目“复杂油气井钻井与完井基础研究”(51821092)
关键词
分散剂
水基钻井液
抗钙聚合物
两性离子聚合物
Dispersant
Water base drilling fluid
Calcium resistant polymer
Amphoteric polymer
