火山岩气藏全过程欠平衡钻井技术

The Integrated Under-balance Drilling Technology in the Development of Volcanic Rock Gas Reservoirs

针对石炭系火山岩气藏在勘探开发过程中遇到的钻井难题,结合2007～2008年新疆油田欠平衡钻井取得的成果,提出在石炭系火山岩地层采用全过程欠平衡钻井技术,能有效利用全过程欠平衡钻井技术优势解决石炭系火山岩气藏地层采用常规钻井技术出现的井漏、储层保护难度大、机械钻速低、井控风险大等开发难题,并针对石炭系火山岩地质特征提出相应全过程欠平衡钻井技术措施。

According to some difficult drilling problems existing in the exploration and development of the carboniferous volcanic rock gas reservoirs,coupled with the achievements of underbalance drilling technology made in Xinjiang oilfields between 2007 and 2008,it is presented that the integrated underbalance drilling technology should be applied to the carboniferous volcanic rock reservoir.In this way,the advantages of the integrated underbanlance drilling technology can be used effectively so as to solve some difficult problems such as the lost circulation,the large degree of difficulties about reservoir protection,the low rate of penetration,and the big risk of well control,which usually appear when the routine drilling technology is used in the exploration of the carboniferous volcanic rock reservoir.Meanwhile,some corresponding measures about the integrated underbalance drilling technology are put forward according to the geological characteristics of carboniferous volcanic rock.