地层压力计算模型及其现场应用

利用岩石力学分析理论,并结合库仑-摩尔准则和拉伸破坏准则建立了地层三项压力(地层孔隙压力、地层破裂压力和地层坍塌压力)的计算模型,并利用大庆油田英台地区的常规测井资料连续地计算了该地区的地层三项压力.通过地层三项压力剖面分析,针对不同井段地质复杂的实际情况,采取了相应的预防技术措施.经现场应用,有效地避免或减少了井下复杂情况的发生,提高了开发效果和钻井效率,为该区安全快速钻井提供了科学依据.

Formation pressure calculation model and its field application

Lost circulation and well collapse often occur in the course of well drilling due to complicated geological situation in Ying-tai region of Daqing oilfield. Lost circulation results in well collapse, and well collapse further exacerbates lost circulation, which causes vicious circle and early well completion, and thus leads to great economic loss. The determination of three formation pressure profiles is vital to borehole stability and well drilling safety. Based on rock mechanics analysis, three formation pressure calculation models is established according to coulomb - mole and tensile failure criterion. This model is also used to calculate three formation pressure of Ying-tai region according to conventional testing data. Through three formation pressure profiles analysis, corresponding prevention method is adopted in field application, which effectively improves the development results and drilling efficiency and provides scientific proof for safe and rapid well drilling in this region.