中途裸眼坐封螺杆泵联作技术加快巴彦河套盆地吉兰泰凹陷新区太古界储层勘探发现

Accelerating exploration discovery of Archaeozoic formation in Jilantai Sag of Bayanhetao Basin by combination test technology of DST and rod pump

X井是华北油田公司勘探事业部在巴彦河套盆地的第一口地质钻孔井,钻进至672.12~728.62 m时发现油气显示。为了快速落实裸眼段的真实液性和产能,在充分认识裸眼井段太古界片麻岩井壁稳定的基础上,采用划眼通井和双井径测井技术,确定了裸眼封隔器坐封位置,实施了中途裸眼坐封螺杆泵联作测试,裸眼井段坐封测试80 h,远远超过地层测试规程规定的最长时间24 h。测试资料解释和取样化验结果表明,裸眼段储层为油水同层,日产油2.84 m^3,日产水10.65 m^3,达到工业油流标准;油相有效渗透率为48.96×10^(-3)μm^2,属于中等渗透储层;表皮系数为12.94,井筒周围存在污染;压力系数为0.901,属于正常地层压力系统。中途裸眼坐封螺杆泵联作技术提高新区勘探时效,为埋藏浅、压力系数低、井温低和岩性稳定的太古界储层中途测试提供可借鉴方法。

Well X is the first geological drilling well by the Exploration Department of Huabei Oilfield Company in Bayanhetao Basin.There has showed indication of oil and gas in the open hole ranging from 672.12m to 728.62m.Combination test technology of DST（d rill stem test） and rod pump was used to determine the real liquid property and productivity of this open hole and the packer setting position was determined by means of reaming down and dual caliper logging based on the cognition of the hole stability of the gneisses in Archaeozoic formation.The test last for about 80 h which was much longer than the setting period provided by the provision of formation test.The interpretation of the test data and sample analysis results show that the formation is oil-water bearing layer with the productivity of the oil production rate of 2.84 m^3 and the water production rate of 10.65 m^3 and the productivity reaches the industrial standard; the formation is medium-permeable with the oil effective permeability of 48.96×10^（-3）μm^2; T he formation damage occurs around the wellbore in account of the skin factor of 12.94; the pressure system is normal for the pressure factor of 0.901.This combination test technology of DST and rod pump accelerates the discovery of new area exploration and provides some references to the DST in Archaeozoic formation with less burial depth,low pressure coefficient,low temperature and hole stability.