异常高压随钻预测理论与方法

The theories and methods for the abnormal high pressure prediction while drilling.

异常高压是含油气盆地普遍存在的一种现象,异常高压随钻预测比钻前预测更为准确、比钻后评价更有实用价值和意义,但它也可称为一项世界级难题。为了突破这项难题,从异常高压的成因机制入手,在深入分析不同成因机制条件下随钻测井、录井资料响应特征的基础上,以异常高压封存箱、欠压实、生烃增压、盐度原理等相对完善的异常高压随钻预测理论为依据,基于压力分布、压力盖层、压力过渡带3个层次,建立系统的异常高压随钻预测方法,提高了异常高压随钻预测水平,发挥了保障钻井安全的指导作用。

Abnormal high pressure is a common phenomenon in oil and gas bearing basins,the forecast of the abnormal high pressure while drilling is more accurate than the forecast before drilling,and has more practical value and is more meaningful than the evaluation after drilling,but it can also be called a world-class problem.To break through this problem,setting forth from the origins of the abnormal high pressure system and on the basis of in-depth analyses on data response characteristics of LWD and mud logging while drilling,the authors established a relatively completed drilling prediction theory for the abnormal high pressure,such as the seal tank for the abnormal high pressure,uncompacted,hydrocarbon generation and pressure booster,salinity principle,which was based on the systematical abnormal high pressure forecasting methods while drilling 3 levels in pressure distribution,pressure cap and pressure transition zone respectively,it has the important guiding significance for improving the level of abnormal high pressure forecasting methods while drilling and drilling safety.