Development and evaluation of leak proof and leak plugging spacer fluid system
The leakage problem during cementing construction seriously affects the success rate of fully sealing the cementing annulus,and conventional spacer fluid system cannot effectively prevent leakage.For this purpose,this article has developed a new type of leak proof and plugging spacer fluid system.The system selects elastic materials(rubber particles)as bridging particles,SC-yt polymers as adsorption materials,and sawdust as filling and reinforcement materials.Through the combination of these materials,the sealing performance for 2 mm cracks can reach up to 7 MPa,and the spacer fluid system has good compatibility with drilling fluid and cement slurry,which can meet the requirements of on-site construction.
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