Evaluation of the Inhibiting Effect of Drilling Fluid on Shale Hydration Based on Acoustictime
- 作者：Lijuan WangXiangjun LiuHong LiuXiaolin WuLexun Xun
- 会议时间：2007-10-20
- 关键词：钻井液 ; 抑制作用 ; Acoustictime ; 页岩水合反应 ; the Inhibiting Effect ; Drilling Fluid
- 作者单位：Lijuan Wang,Xiangjun Liu,Hong Liu,Xiaolin Wu(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation)Lexun Xun(Oilfield technology services company of CNOOC oil bas group LTD.)
- 母体文献：2007年油气藏地质及开发工程国家重点实验室第四次国际学术会议论文集
- 会议名称：2007年油气藏地质及开发工程国家重点实验室第四次国际学术会议
- 会议地点：成都
- 主办单位：中国石油学会
- 语种：chi
摘要
Acoustic time is the reflection of mechanical strength of rock. The study on shale hydration based on acoustic time can reflect the metabolic feature of strength and stability of borehole wall and shale. A series of hydration and acoustic wave experiments are carried to study the process of shale hydration and the inhibiting effect of drilling fluid on shale hydration, the result showed: (1) The hydration level when shale contact with drilling fluid is mutually related to the variation of intercrystalline distance. The result of hydration increase the intercrystalline distance of shale, which provide theoretical foundation for evaluating the hydration level by acoustic time. (2) When shale contact with incompatible drilling fluid, volume swelling is visual macroscopically, the acoustic time value is increased as the increasing of hydration time, so the hydration swelling level can be evaluated based on acoustic time. (3) The acoustic time of shale samples which immersed in inhibitive mud generally decreased, the variation of acoustic time reflect the inhibiting effect of drilling fluid on shale hydration, which provide significant theoretical foundation for making drilling program effectively.