Prediction and Analysis of Stratum Stress in L-1 Well
In-situ stress research is closely related to oil and gas exploration and development.In order to further understand the distribution law and function of in-situ stress in strata,this paper summarizes the specific methods of in-situ stress prediction.The mechanical parameters and tensile strength of rocks are calculated by using logging data.The Poisson's ratio curve of Well L-1 changes little in the 3721-3740m interval,and greatly in the 3760-3800m interval.The curve tends to be stable in the 3820-3850m interval,and the changes of rock mechanical parameters correspond well with the changes of lithology,which accords with the laws of mechanical parameters.The predicted formation pressure coefficient is about 1.00 in the well section above 2000m,and the horizontal principal stress is generally greater than the vertical principal stress.The horizontal principal stress curve does not change much in the muddy interval of 2721～3740 m,which is due to the relatively high formation pressure in the reservoir segment,which has an impact on the horizontal principal stress.Combined with seismic,well logging and ground drain test data,the ground stress calculation is consistent with the real drilling mechanical parameters after drilling,and the prediction effect is good.
万方数据
维普
