普光气田地层自然造斜能力计算新方法

A new calculation method of formation natural deflecting force in Puguang gas field

普光气田是中国石化集团公司重要的油气勘探战略接替区。该地区由于地质构造复杂,地层倾角大,地层自然造斜能力强,严重地制约了该地区勘探目的的顺利实现。为了定量地分析普光气田的地层自然造斜能力,以便更好地发挥其在钻井生产中的指导作用,以纵横弯曲理论为基础,开发了地层自然造斜能力分析计算软件,并对普光气田的地层自然造斜能力进行了计算分析。结果表明:在普光气田的中部,千佛崖组及其以上地层的自然造斜能力相对较弱;而自流井组及其以下(不包括须家河组)地层的自然造斜能力相对较强。所建立的计算地层自然造斜能力新方法为提高定向井、水平井等钻井工艺作业效率、减少井下事故有着重要的意义。

The Puguang gas field is a new strategic area of oil and gas resources for SINOPEC. The factors that restrict the exploration in this area are closely related with complex geological structure,high formation dip,and high formation natural deflecting force. On the basis of the beam-column theory,a computing program calculating the formation natural deflecting force in the Puguang gas field was established for quantitative analysis. The results show that in the central part of Puguang gas field,the upper strata over the Qianfoya strata (including the Qianfoya strata) have lower formation natural deflecting force,and below the Ziliujing strata (not including the Xujiahe strata) have higher formation natural deflecting force,thus this new calculation method will be significant for improving drilling efficiency and reducing downhole accidents during directional or horizontal well drilling.