油气井工程中地应力场反演研究的发展

Development of inversion study on in-situ stress field in petroleum engineering

在石油勘探开发中,地应力研究区块较大,而测量的已知参数信息量少,直接用有限元数值模拟所得的结果往往与实际情况有较大的偏差,这些问题成为地应力理论分析和数值模拟的"瓶颈"。为此提出将反演理论引入油气勘探开发的"深部"复杂地层地应力研究,并详细论述了地应力场反演研究在油气井工程中的应用和发展。将岩土工程反演理论和有限元数值模拟相结合,引入油气井工程深部地层中地应力分布与勘探井、开发井准确定井位以及生产井中套管损坏机理的研究中,将在该领域突破理论和方法上的研究"瓶颈"。最后对于推动地应力场反演理论在油气井工程深部地层中的应用与发展,提出了研究中应解决的关键技术问题。

In the petroleum exploration and exploitation, research about in-situ stress is extensive. But for the little information included in the measured parameters, the results often have a large deviation from practice if finite-element method （FEM） numerical simulation is used directly. This becomes the bottle-neck for the theoretical analysis and numerical simulation of the in-situ stress. So the inversion theory was introduced to study in-situ stress in deep and complex formation, and a review of the development and application of inversion study on in-situ stress in oil and gas well engineering was also described in detail. Based on the integration of geotechnical engineering inversion theory and FEM numerical simulation, bottle-neck will be broken through in the accurate location of the explora- tion well and the exploitation well as well as the mechanism study of casing failure. Finally, the key technique in the study was presented in the paper, which will promote the application and development of the in-situ stress inversion theory in the deep formation in petroleum engineering.