白油基钻井液的性能研究

Performance Study of the Oil-based Drilling Fluid

某井根据地质需要提供的数据,地层压力系数平均为0.90—1.17,地温梯度3.5℃/100m,为正常温度压力系统。对白油基钻井液配方通过室内研究发现,它可以在最大程度上满足密闭取芯的需要、减少对地层的伤害,保护油气层。同时该白油基钻井液的高温高压滤失量低,形成的泥饼质量好,拥有强的抑制性,有利于井壁稳定,防止井径扩大。

According to geological data,the formation pressure coefficient of a well which we study is 0.90-1.17 equally,and the geothermal gradient is 3.5℃ /100m.These are normal temperature pressure system.We can see that white oil-based drilling fluid can satisfy the need of fetching a core in airtight condition,the reduce injury to the stratum,and protect the hydrocarbon reservoir.Simultaneously,the filter loss of this white oil base drilling fluid in high temperature and high pressure is low.The filter cake quality good in form,has strong suppressant,is advantageous to stabilize the wall,and prevents the overcut.