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.
Fuzzy ball drilling fluids have been developed in order to effectively control lost circulation during CBM drilling. Depending upon fuzzy balls and colloids in fuzzy balls, the fuzzy ball drilling fluids changed their shapes and properties to completely plug underground heterogeneous seepage channels so as to strengthen the pressure bearing capacity of formations. This paper describes the available features of the fuzzy ball drilling fluid including efficient plugging, good carrying and suspension, formation damage control, compatible weighted by any weighted materials without auxiliary equipment. The fuzzy ball drilling fluids can finish drilling in low pressure natural gas zone, control CBM leakage; control the natural fractures, drilling in different pressures in the same open hole, combination with the air drilling mode, etc. during Ordos CBM drilling. The fuzzy ball drilling fluid will not affect down-hole motors and MWD. The fuzzy ball drilling fluid will be blend simply as conventional water based drilling fluids. The existing CBM drilling equipment can completely meet the fuzzy ball drilling mixing and it is maintained conveniently. The fuzzy ball drilling fluid is the efficient drilling fluid.
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