NP2-82井欠平衡随钻储层评价初探

RESEARCH ON RESERVOIR EVALUATION METHOD WHILE DRILLING IN UNDERBALANCED DRILLING OF NP2-82 WELL

为了探明南堡2号构造潜山南断块奥陶系含油气情况,在NP2-82采用注气控压欠平衡钻井,并应用随钻压力监测和随钻储层评价技术。通过随钻地层压力测试技术地层压力系数为1.027,通过地面压力检测和井筒多相流计算获取了实时井筒液柱压力剖面并有效的控制井底欠平衡状态和井筒流态,同时通过注入与产出气量监测、气体组分监测、随钻地层压力测试、井筒液柱压力计算和随钻储层参数解释技术,得到NP2-82井奥陶系渗透率范围(0.001～32)×10-3μm2,平均渗透率在0.741×10-3μm2,储层介质类型为主要为裂缝型灰褐色灰岩,评价结果与钻后测井数据吻合较好。

In order to explore the gas and oil situation of Nanpu-2 structure of Qianshan south block of Ordovician,control pressure underbalanced drilling technology by injection gas,and pressure monitoring and reservoir evaluation technology while drilling were applied.The formation pressure coefficient of 1.027 was obtained by formation pressure testing technology while drilling,and the real-time profile of wellbore fluid pressure was obtained to effectively control the bottom underbalanced status and the wellbore fluid state through the ground pressure testing and wellbore multiphase flow calculation.At the same time,other parameters were also obtained,such as the permeability range of Ordovician in NP2-82 well is 0.001～ 32x 10-3um2,and the average permeability is 0.741 x 10-3um2,and the major reservoir medium type is fractured brown limestone.The evaluation results agree well with the logging data of drilled well