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准噶尔盆地东部地区存在多套不同的压力层系,给钻井工程带来了很多困难。地层压力的准确计算对于合理、经济地选用钻井液性能,防止井喷、井漏、井塌等复杂钻井情况的发生具有重要意义。为此,分析了准噶尔盆地东部地区异常压力成因机理,认为水热增压、烃类生成和黏土矿物转化不是该地区异常压力主要成因,欠压实作用才是造成该地区异常压力的主要机理。以现场测井资料和实际施工数据为基础,应用测井资料解释方法对该地区的A1井等6口井进行了地层压力预测。结果表明:奇古组以下地层存在异常高压,钻井时应提高钻井液密度来实现平衡钻井;地层压力预测值与实测值相对误差最高为4.3%,预测精度高,达到了指导现场安全钻井和井控的目的。
There are several sets of different pressure strata in the eastern part of Junggar Basin, which bring many difficulties to drilling engineering. Accurate calculation of formation pressure is of great significance for the reasonable and economical selection of drilling fluid properties and prevention of complex drilling conditions such as blowout, well leakage and well collapse. Therefore, the mechanism of anomalous pressure in the eastern part of Junggar Basin is analyzed. Hydrothermal pressurization, hydrocarbon generation and clay mineral transformation are not the main causes of anomalous pressure in this area. Undercompaction is the main mechanism that causes abnormal pressure in this area. Based on the field logging data and the actual construction data, the well logging data interpretation method was used to predict the formation pressure of six wells in the A1 well. The results show that there are abnormally high pressures in the following formations of Qigu Formation, and the drilling fluid density should be increased to achieve balanced drilling. The relative error between predicted and measured values of formation pressure is as high as 4.3% and the prediction accuracy is high, The purpose of control.