高温环境下钻井泥浆体系性能评价

Evaluation of Drilling Mud System Performance under High Temperature Environment

摘要: 深井钻探面临着多压力系统、窄密度窗口、高温高压、溢漏同存等诸多工程技术挑战。钻井泥浆是维持钻井过程稳定的关键因素，一旦钻井泥浆失控，可能导致井涌、井喷及井壁失稳等问题。以大安区块为例，利用室内实验对深井钻井高温环境下泥浆性能的变化情况进行评价，分析了不同密度的KCl-聚合物钻井泥浆及油基钻井泥浆在不同温度下的流变性、封堵性、润滑性及稳定性等变化。结果表明：KCl-聚合物钻井泥浆在最高100℃下仍能满足钻井的性能需求；油基钻井泥浆在120℃时能满足钻井的性能要求，在150℃时需优化泥浆配方，增加泥浆切力。

Abstract: Deep well drilling is faced with many engineering and technical challenges, such as multi-pressure system, narrow density window, high temperature and high pressure, and leakage co-storage. Drilling mud is the key factor to maintain the stability of drilling process. Once drilling mud is out of control, it may lead to kick, blowout and wellbore instability. Taking Da’an Block as an example, laboratory experiments were conducted to evaluate the variation of mud properties under high temperature environment of deep well drilling, and the changes of rheology, plugging property, lubricity and stability of KCL-polymer drilling mud and oil-based drilling mud with different densities were analyzed at different temperatures. The results show that KCL-polymer drilling mud can still meet the drilling performance requirements at the highest temperature of 100˚C. Oil-based drilling mud can meet the performance requirements of drilling at 120˚C, and it is necessary to optimize the mud formulation and increase the cutting force at 150˚C.