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。 A well according to the geological needs of the data provided, the average formation pressure coefficient of 0.90-1.17, the temperature gradient of 3.5 ℃ / 100m, for the normal temperature and pressure system. White oil-based drilling fluid formulations through laboratory studies have found that it can meet the maximum requirements of closed coring, reduce the damage to the formation, the protection of oil and gas layers. At the same time, the high temperature and high pressure fluid loss of the white oil-based drilling fluid is low, the mud cake formed is of good quality and strong inhibition, which is beneficial to the stability of the borehole wall and preventing the diameter expansion of the borehole.