The drilling technology of big inclination long open hole directional well in the Southwest China Sea Oilfield

As the development of oil drilling technology, for increasing the production of oil well, it needs maximum exposure area of oil stratum, big rake directional wells are used more and more by oil fields; for “three-low” stratum or “thin” stratum, big rake increases the exposure area of oil stratum and production of oil well; for offshore oil exploitation, because of space limitation of offshore production platform, under limited space and wells, for exploiting whole area maximum, big rake directional well is effective measure. Otherwise, as the development of drilling technology, after optimizing well depth structure, big rake and long naked directional well are used widely, but there are many questions such as well clearness, well wall stability, cementing after running casings, sometimes leads to many the ins and the outs of oil below. This article combines kinds of each well segment‘s constructions technology and drilling fluid’s technological outlines and measure of west of south china sea, the basin of North Gulf, WeiZhou11-1N oil field, A8 well, big rake double targets deep directional well. Discuss the controlling of well track, optimizing drilling tools assembly, the disposal of pressure and stuck, carrying rock crumbles, stabilization of oil well, running in casing cement and so on, bring forward relevant measurements pertinently. The task practice of A8 well will be provided with good guidance and use for reference to relevant well, big displacement and level wells work.