海拉尔地区三个地层压力的预测与计算

Prediction and Calculation of Three Different Formation Pressure in Hailaer Area

摘要:

根据已钻井的测井资料，对海拉尔油田的几个主要区块进行了地层孔隙压力、地层破裂压力和井壁坍塌压力的分析和计算，并建立了不同区块的单井压力的变化及本区块压力随深度变化的剖面图。分析研究发现，使用声波时差方法预测地层压力可以取得准确的预测值：破裂压力计算应用了伊顿模式、史蒂芬模式、黄荣樽模式和测井资料法，然后对各种方法进行对比分析发现黄荣樽法破裂压力预测数据准确；而坍塌压力则可以通过莫尔-库仑准则得到满足工程需要的精度。最后综合考虑确定出各个区块的合理安全泥浆密度窗口。

Abstract:

Based on the logging data of the drilled holes, analysis and calculation were made on the formation pore pressure, formation fracture pressure and borehole collapsing pressure in main blocks of the Hailaer oilfield; the sectional drawing was also established for pressure change of wells in different blocks and pressure change of wells in the same block but with different depth. According to the analysis, accurate predictive value of formation pressure could be obtained by acoustic time difference method. The fracture pressure was calculated by Eaton mode, Steve mode, Huangrongzun mode and well log data; the comparison proved the predictive data of fracture pressure by Huangrongzun mode was accurate and the collapsing pressure calculated by Mohr-Column rule could satisfy the project precision requirement. Reasonable and safe drilling mud destiny window was eventually determined for different blocks by comprehensive consideration.