低渗气藏等时试井和延长测试精细解释研究  

Fine Interpretation of Isochronic Well Testing and Extension Testing in Low Permeability Gas Reservoir

作　　者：张利军 王帅 彭世强 夏阳 Zhang Lijun;Wang Shuai;Peng Shiqiang;Xia Yang(CNOOC Research Institute Co., Ltd., Beijing 100028, China)

机构地区：[1]中海油研究总院有限责任公司,北京100028

出　　处：《非常规油气》2020年第6期71-75,共5页Unconventional Oil & Gas

摘　　要：某低渗气井进行了修正等时试井和延长测试,均具有稳定的压力恢复资料。本文通过对修正等时试井和延长测试解释对比分析,并引入反褶积试井解释方法,通过试井落实该测试井纵向隔夹层为局部发育,平面为多期砂体叠置连通的模式,纵向渗透率极差达到9倍,砂体叠置边界分别18 m和148 m;针对气井近井筒地带流速高、存在高速非达西的问题,引入流量变表皮试井方法,解释真实污染表皮系数为-3,非达西D因子为8.9×10^-6(m^3/d)^-1,校正后无阻流量为33.9×10^4 m^3。以上成果认识为该气藏的储层评价和产能分析提供指导,其研究方法对类似气藏试井和产能评价具有重要的指导意义。A modified isochronous well test and extension test were carried out in a low permeability gas well,which have stable pressure recovery data.Taking the test data of a low permeability sandstone gas reservoir offshore as an example,this paper introduced the deconvolution well test interpretation method,compared and analyzed the modified isochronal well test and pre-production test interpretation,the pattern of partially developed interbeds and multi-stage sand body superimposition in plane is recognized in this well.Vertical permeability range of well test interpretation is 9 times,and sand body superimposed boundary is 18 m and 148 m.Because of the high velocity near the wellbore of gas wells,the problem of high-speed non-Darcy exists.In this paper,the variable skin flow well testing method is introduced,explained true skin factor is-3,non-Darcy D factor is 8.9×10^-6(m^3/d)-1,and the corrected AOF is 339000 square meters.In this paper,the recognition of sand superimposition model and the calculation results of AOF can provide guidance for reservoir evaluation and productivity analysis of this gas reservoir.The research method in this paper has important guiding significance for well testing and productivity evaluation of similar gas reservoirs.

关 键 词：试井 砂体叠置 反褶积试井 非达西 无阻流量 

分 类 号：TE121.1[石油与天然气工程—油气勘探]