应用NDR计算地层孔隙压力

Calculating Formation Pore Pressure Using NDR

该文介绍了一种现场预测地层孔隙压力的有效方法NDR标准化钻速法。该方法从钻压、转盘转速、及水力学方面对钻井机械钻速进行校正,使其影响因素仅与压差和地层有关,从而使NDR能够正确反映地层的可钻性。地层可钻性与地层的压实程度和孔隙破裂程度有关,因此NDR可以反映地层孔隙压力的情况。用NDR预测地层孔隙压力目前国内录井涉及很少,希望通过该文能为更好地预测地层孔隙压力、提高录井服务质量做出一些贡献。

The paper presents an effective way to predict formation pore pressure at wellsite-normalized drilling rate.Correting drilling mechanical rate through weight on bit,rotary speed and hydraulic parameters,the NDR′s affecting factors are only related to presure difference and formation,so that NDR can properly reflect formation drillability.Formation drillability is related to formation compact degree and pore fracture degree,so NDR can reflect formation pore pressure state.It is rarely used domestically to predict fromation pore pressure with NDR,the author hopes to predict formation pore pressure better by this article,promoting logging service quality.