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首页> 外文期刊>Fresenius environmental bulletin >EXPERIMENTAL STUDY OF A NOVEL WHITE OIL BASED WATER-IN-OIL DRILLING FLUID USED FOR HORIZONTAL WELLS IN SHALE GAS RESERVOIR OF YANCHANG OILFIELD, CHINA
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EXPERIMENTAL STUDY OF A NOVEL WHITE OIL BASED WATER-IN-OIL DRILLING FLUID USED FOR HORIZONTAL WELLS IN SHALE GAS RESERVOIR OF YANCHANG OILFIELD, CHINA

机译：盐厂油田页岩气储层水平井中一种新型的白色油基油包水钻井液的试验研究

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摘要

Open hole wellbore instability is very common during the drilling of horizontal shale gas horizontal wells in Ordos Basin of Yanchang oilfield. To solve these problems, this paper innovatively proposed a water-in-oil emulsified drilling fluid formula. Laboratory experiments are conducted to optimize the drilling fluid additives, and two water- in-oil emulsified drilling fluid formula are chosen. The evaluation experiments show that the two drilling fluids have good rheological properties, antifiltration loss, and good ability to inhibit mudstone expansion. After aging for 48h at 100°C, the high- temperature/high-pressure filtration loss is almost zero, and the rheological properties maintained good performance after aging. After hot rolling for 16h in 100 °C, the shale rolling recovery rate is respectively determined to be 92.08%, 86.45% for 1# and 2# drilling fluid formula. After that, a concentration of 0%, 5%, 10%, and 15% of water, CaSO4 and brine were added in the 1# formula. The rheological properties did not change too much, indicating that the system has a strong antipollution ability. Therefore, the 1# white oil drilling fluid system has better comprehensive performance and can meet the requirements of shale gas horizontal well drilling process.
机译：延长油田鄂尔多斯盆地水平页岩气水平井钻井过程中，裸眼井筒失稳现象非常普遍。为了解决这些问题，本文创新地提出了油包水乳化钻井液配方。进行实验室实验以优化钻井液添加剂，并选择了两种油包水乳化钻井液配方。评价实验表明，两种钻井液具有良好的流变性，抗滤失性和良好的抑制泥岩膨胀能力。在100°C下老化48h后，高温/高压过滤损失几乎为零，老化后的流变性保持了良好的性能。在100°C下热轧16h后，确定1＃和2＃钻井液配方的页岩轧制回收率分别为92.08％，86.45％。之后，将浓度为0％，5％，10％和15％的水，CaSO4和盐水添加到1＃配方中。流变特性没有太大变化，表明该系统具有很强的抗污染能力。因此，该1＃白油钻井液系统具有较好的综合性能，可以满足页岩气水平井钻井工艺的要求。

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