Wennan oilfield belongs to many faults oilfield. The
formation is very complicated and unstable ,and easily falls blocks
or even caves in . In most blocks , there are long distance clay
layers with gypsum that make it diffcult to keep the properties of
the drilling fluid ,and the pressure sequence of formation is not
regular that easily result in blowout ,mud lost , sticking the pipe
and collapse in drilling process that affect the safety of downhole
and limit the rate of drilling . With controlling solid , stabilizing
the wall of the well and preventing mud lost etc technologies in
drilling process ,the drilling effect is satisfatied and drilling rate
also have been improved.
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