SAGD开发中突破夹层技术对策研究
Countermeasures Against Interbedded Barriers in SAGD Process

摘要： 开发实践表明，稠油油藏内部发育的夹层影响蒸汽辅助重力泄油(SAGD)开发效果。实际SAGD开发应当充分考虑夹层对SAGD生产效果的影响，寻找突破夹层的有效对策，以期提高SAGD产量。以国内某超稠油油藏地质特征为基础，结合夹层岩石力学参数测试结果，利用耦合岩石力学数值模拟技术确定了不同参数(岩石力学参数、物性参数、操作参数)对岩石变形量、SAGD产量的敏感性。研究结果表明，夹层的渗透率和SAGD注汽压力是影响SAGD产量的主要因素。进一步地，针对夹层特征，结合实际操作可行性，提出了提高注汽压力和直井辅助两种突破夹层技术对策，并给出了相应的技术界限及突破效果，该研究结果可用于指导稠油油藏双水平井SAGD经济高效开发
Abstract: Interbedded barriers sandwiched in heavy oil reservoirs have impacts on steam assisted gravity drainage (SAGD) performance. In the real SAGD operation, the impacts must be taken into full consideration and effective countermeasures against barriers must be studied to improve the SAGD oil production rate. In this paper, features of deformation of barrier rock under high temperature and high pressure conditions in the SAGD process were studied by coupled geomechanical numerical simulations with parameters gained from geomechanical tests of barrier rocks. The permeability of the barrier and the injection pressure of SAGD were determined to be main factors affecting the oil production rate of SAGD. Furthermore, two types of countermeasures against interbedded barriers, namely increasing injection pressure and vertical well assisted, were proposed, with characteristics of barriers and operational feasibility being taken into account together. And technical limitation and corresponding operation effect of each countermeasure were also provided. The results have an important guiding significance to the realization of economic and efficient development in SAGD proces