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《Drilling Fluid & Completion Fluid》 2017-02
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Research on the Hydration Mechanism of A Kind of Solidifiable Leakage-proof Working Fluid

LI Zaoyuan;ZHOU Jingdong;DENG Zhizhong;GUO Xiaoyang;Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University;  
While cementing in the low pressure and easy to leak hole section,low formation bearing pressure、leakage and channeling often lead to low cementing quality.So a low density(1.30 g/cm~3) working fluid which can be solidifiable and prevent leakage was studied to solve the problem.The working fluid was made form the high quality spacer fluid in which a kind of curing properties of the material(2.60~2.90 g/cm~3)replacing weighting material was added.The working fluid can effectively balance formation pressure and cure in annulus,thus preventing leakage and improving cementing quality.The strength of samples after curing and hydration mechanism of the working fluid were mainly analyzed in the paper.The results showed that the structure of the curing strength development is that hydroxyl ions damaged the vitreous body structure of the curing agent.Through the adjustment of the formula,curing test specimens from 30~90 ℃ had a certain compressive strength.The research and development of the working fluid system provided a new way for the design of the leak protection working fluid.The working fluid system can also be applied to sealing in drilling engineering to increasing the formation bearing pressure.
【Fund】: 国家自然科学基金“基于多相渗流理论的环空气窜机理及应用基础研究”(51574203)
【CateGory Index】: TE256.6
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