Selection of cutting carrying medium is very important for unbalanced drilling, which should protect oil & gas reservoir and keep the borehole stability. Oil-in-water system was firstly applied in the fourth unbalanced drilling section of Well Lishen 1. Optimized drilling fluid formula and scientific maintenance played well in oil & gas formation protection and borehole collapsing prevention, a new type of cutting carrying medium was developed for unbalanced drilling construction in this area.
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祃树攀,张彦明.水包油钻井液在梨深1井欠平衡段的应用[J].钻探工程,2009,36(10):18-20.MA Shu-pan, ZHANG Yan-ming. Application of Oil-in-water Drilling Fluid in Unbalanced Drilling Section of Well Lishen 1[J]. Drilling Engineering, 2009,36(10):18-20.