石油钻采工艺2017，Vol.39Issue(5)：574-579,6.DOI:10.13639/j.odpt.2017.05.008
油基钻井液与水泥浆接触污染内因探讨
Discussion on the internal causes of contact contamination between oil-base drilling fluid and cement slurry
摘要
Abstract
Oil-base drilling fluid is widely used for the drilling of deep wells and complex-structure wells owing to its better proper-ties. With its wide application, however, the complicated conditions occur more and more frequently in the hole because of the contact contamination between the oil-base drilling fluid and the cement slurry. In this paper, the effects of the drilling fluid and its additive on the properties of cement slurry were firstly analyzed. Then, the phase and microscopic morphology of cement slurry before and after it was blended with drilling fluid and its additive were investigated by means of modern analysis technologies, e.g. SEM, XRD and FTIR. It is shown that the cement slurry is condensed and thickened for the content of calcium hydroxide is consumed and increased in the different stages of cement hydration by the filtrate reducer and the calcium chloride in the oil-base drilling fluid, respectively, and consequently the mobility of the cement slurry gets worse seriously. The primary emulsion, auxiliary emulsion and clay increase the strength and thickness of the film at the interface of oil-base drilling fluid, so the emulsified structures of oil in water/water in oil cannot be formed easily. As a result, the contamination is induced. The systematic study plays a significant role in understanding the essence of contact contamination between oil-base drilling fluid and cement slurry, providing the technical reference for the prevention of contact contamination between them.关键词
油基钻井液/水泥浆/接触污染/单因素分析Key words
oil-base drilling fluid/cement slurry/contact contamination/univariate analysis分类
能源科技引用本文复制引用
袁中涛,杨谋,李晓春,李肖肖,张峰,刘忠飞..油基钻井液与水泥浆接触污染内因探讨[J].石油钻采工艺,2017,39(5):574-579,6.基金项目
项目基金:中石油重大专项"前陆冲断带超深井钻完井技术(编号:2014E-2102) （编号:2014E-2102）
和国家自然科学基金"深井井筒-地层传热传质环境下井筒温度压力时变特性研究"(编号:51504210). （编号:51504210）
