Practice of Fuzzy Ball Cementing Pad Fluid in Leakage Zone of Naiman Well N-X-Y

Abstract

This paper has analyzed the geology and engineering factors of poor cement quality in leakage zone of Jiu Fotang Formation in Naiman Block. Lab evaluation shows that the value of YP/PV of Ceram site-weighted fuzzy ball pad fluid is more than 1.0Pa/mPas, cuttings recovery rate is 94% and bearing pressure is more than 5MPa. 10m3 of pad fluid was pumped to the leakage section of 2310-1865m of Jiu Fotang formation in the well N-X-Y, and pump pressure decreased slightly from 3.8MPa to 3.6MPa and so was the return to surface. However, for this severe leaking zone, this leakage can be accepted. Cement quality was evaluated as acceptable by logging. The problem of cement slurry leakage was solved by fuzzy ball pad fluid and cement quality was improved, so the remedial measure for trial production test was skipped, and then the job cost was reduced and the application of fuzzy ball was also broadened.