超高密度压井液在英深1井的应用

英深1井是一口五开重点复杂超深预探井。该井位于塔里木盆地西南坳陷齐姆根凸起英吉沙构造,完钻井深为7258m。该井在侧钻后处理井漏过程中,发生高压盐水溢流,控制溢流需密度为2.8g/cm3的超高密度压井液。因现场条件限制,使用密度为4.80g/cm3的铁矿粉作为加重剂配制该压井液,在兼顾流变性、抗盐污染等性能基础上,通过现场实验,配制成功。该压井液具有良好的抗高温能力,在溢流处理过程中发挥了好的作用。

The Application of Ultra-high Density Kill Mud in Well Yingshen-1

Well Yingshen-1 is a five-section pioneer well located in Yingjisha structure, Tarim Basin. The drilled depth is 7,258 meters. Mud losses and water kick occurred frequently and, sometimes, simultaneously. To kill a high pressure water kick, a kill mud with high density, 2. 8. g/cm3, should be used. Hematite, a heavy weighting material, with a density of 4. 8 g/cm3, was used in formulating the kill mud, taking into consideration both the rheology properties and salt tolerance of the mud. This kill mud could be used at elevated temperatures. The water kick was successfully stopped using this specially designed kill mud.