扶余油田非均质储层钻井液污染研究

Research on drilling fluid pollution of heterogeneous reservoirs in Fuyu oilfield

扶余油田储层渗透率级差大,层内非均质性较强,钻井液污染储层程度不一,严重制约油气储层的识别。通过钻井液损害油层室内评价实验,回归出不同渗透率储层钻井液污染深度随时间变化的数学模型,分析了非均质储层钻井液污染程度的规律;同时结合区块储层敏感性数据,通过对比污染前后岩心气测渗透率的方法,探究了钻井液污染非均质储层的机理。

Fuyu oilfield has the characteristics of big reservoir permeability differential,stronger intraformational heterogeneity and different level of drilling fluid pollution,which seriously restricted the oil and gas reservoir identification.Through laboratory evaluation experiments on the drilling fluid damage to reservoirs,the mathematical model of different permeability reservoir drilling fluid pollution with the change of time has been established and the heterogeneity of reservoir drilling fluid pollution law has been analyzed.Combined with block reservoir sensitivity data at the same time,by comparing the method of gas logging permeability cores before and after pollution,the drilling fluid pollution mechanism of heterogeneous reservoir has been studied.