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《钻井手册(甲方)》中对钻遇油气层时的钻井液密度有规定,即油层D附加0.05～0.10 g/cm~3,气层D附加0.07～0.15g/cm~3,这是完全正确的。但是,对于高压油气层必须取其上限,否则是不安全的。例如1993年新疆石油管理局在塔里木盆地麦盖提斜坡琼库恰克构造上钻探的002井,使用D为1.76 g/cm~3的钻井液钻到井深4776.48m时,从钻时上分析可知已钻开油层0.5m。停钻,循环钻井液进行地质观察,溢流量达2.8m~3,当即关井、求压,10min后立管压力为3 MPa,4 h内立管压力均恒定在此值。经计算知此时的地层压力为
The Drilling Manual (Party A) provides for the drilling fluid density when drilling an oil-gas formation, that is, oil layer D is added with 0.05-0.10 g / cm3 and gas layer D is added with 0.07-0.15 g / cm3 Completely correct However, it is not safe for high pressure reservoirs to be capped. For example, in 1993, Xinjiang Oilfield Administration Drilling Well 002 in the Qiongkuchak structure of the Maigaiti slope in the Tarim Basin and drilling depth of 4776.48m with drilling fluid of D = 1.76 g / cm ~ 3, Drilled oil layer has been 0.5m. Stop drilling and circulating drilling fluid for geological observation. The overflow volume reached 2.8m ~ 3. Immediately shut-in and pressure reduction, the riser pressure was 3 MPa after 10 minutes and the riser pressure was constant at 4 hours. After calculating the formation pressure at this time