地层压力预测分析方法在秦皇岛某油田中应用

地层压力预测是钻井基本设计与钻井工程设计的基础,是确定钻井井身结构、钻井液体系及密度、预防和减少井下复杂情况不可缺少的关键数据。文章通过对Drillworks压力预测软件分析及操作流程应用在秦皇岛某油田。根据现场监测到的压力及地漏试验数据对该油田的孔隙压力、破裂压力、坍塌压力进行了预测。计算发现该井坍塌压力为1.128-1.271g/cc大于孔隙压力,因此,在进行钻井设计时,应参照坍塌压力和破裂压力确定泥浆安全密度窗口。

Formation pressure prediction is the basis of drilling basic design and drilling engineering design. It is an indispensable key data to determine drilling well structure, drilling fluid system and density, so as to prevent and reduce the complex situation in downhole. In this paper, Drillworks pressure prediction software analysis and operation process are applied in Qinhuangdao Oil Field. The pore pressure, fracture pressure and collapse pressure of the oilfield are forecast according to the pressure monitored in the field and the ground drain test data. It is found that the collapse pressure of the well is 1.128-1.271 g/cc larger than the pore pressure, there-fore, in drilling design, the mud safety density window should be determined by reference to collapse pressure and fracture pressure.