多介质助剂与蒸汽协同作用开发稠油油藏机理与实验研究

At present,there are inadequate studies on mechanisms of steam distillation and influences of injected multi-medium assisted solvents on steam distillation. Besides,there exist many other problems,such as large steam consumption,severe heat loss and low initial oil recovery during start-up preheating processes by using steam assisted gravity drainage (SAGD) technology in developing heavy oil reservoirs.To overcome these drawbacks,the synergistic effects united multi-medium assisted solvents and steam are proposed to develop heavy oil reservoirs.Based on Fengcheng heavy-oil block in XinJiang Oilfields, the mechanisms of steam distillation as well as the effects of multi-medium assisted solvents on steam distillation and preheating efficiency during start-up processes of SAGD will be intensively investigated by using physical experiment associated with simulation technology.Meanwhile,the multi-medium assisted solvents (urea/CO2/viscosity reducer) assisted SAGD experiments will be conducted and compared with the conventional SAGD experiments.Based on the expansion rate,expansion direction of steam chamber and production parameters,the mechanisms in raising yield induced by synergism effects of combinations of multi-medium solvents and injected steam will be intensively revealed.In addition,the experimental processes will be validated by using CMG simulation software.Selected the target block as an example, field application designs of multi-medium assisted solvents assisting SAGD production processes will be executed by using the experimental results and numerical simulation.Those researches are extremely significant to deeply understand the mechanisms of the steam distillation and the start-up preheating processes as well as the dynamic characteristics of synergism effects united multi-medium solvents and injected steam in developing heavy oil reservoirs.There are of great theoretical and practical significances for improving high efficient development in heavy oil reservoirs.

目前，对蒸汽蒸馏机理和多介质助剂对蒸馏效果影响的研究不足，同时在蒸汽辅助重力泄油(SAGD)启动预热过程中，存在蒸汽消耗量大、热损失严重、初始采收率低等问题。本课题以新疆风城稠油区块为研究对象，以物理实验与数值模拟相结合，提出多介质助剂与蒸汽协同开发稠油油藏机理和实验研究，研究蒸汽蒸馏作用机理、多介质助剂对蒸馏效果以及在SAGD启动阶段对预热效率的影响；通过多介质助剂(尿素/CO2/降粘剂)辅助SAGD实验和常规实验对比，以蒸汽腔的扩展速度、扩展方向和生产参数为对照，分析多介质助剂与蒸汽协同作用的增产机理，并通过CMG软件验证实验过程；利用实验结果和数值模拟，以目标区块为例，开展多介质助剂辅助SAGD矿场应用设计。该课题有助于明确多介质助剂对蒸汽蒸馏和SAGD启动预热作用机理，深入认识多介质助剂与蒸汽协同作用开发稠油油藏的动态特征，对稠油油藏的高效开发具有重要的理论和现实意义。

针对稠油油藏蒸汽蒸馏、多介质助剂对蒸馏效果以及蒸汽辅助重力泄油(SAGD)启动预热过程中认识存在不足。本课题以新疆风城稠油区块为研究对象，以物理实验与数值模拟相结合，进行了多介质助剂与蒸汽协同开发稠油油藏机理和实验研究，研究了蒸汽蒸馏作用机理、多介质助剂对蒸馏效果以及在SAGD启动阶段对预热效率的影响；通过多介质助剂(尿素/CO2/降粘剂)辅助SAGD实验和常规实验对比，以蒸汽腔的扩展速度、扩展方向和生产参数为对照，分析了多介质助剂与蒸汽协同作用的增产机理，并通过CMG软件验证实验过程；利用实验结果和数值模拟，以新疆风城32区块为例，开展了多介质助剂辅助SAGD矿场应用设计。该课题有助于明确多介质助剂对蒸汽蒸馏和SAGD启动预热作用机理，其结论对于深入认识多介质助剂与蒸汽协同作用开发稠油油藏的动态特征，对稠油油藏的高效开发具有重要的理论和现实意义。