挥发性油藏回注气井控因素分析及措施

文章明确了挥发性油藏天然气回注井控的安全环保关键因素;量化了低渗挥发性油藏天然气回注注入能力,确定注入端各节点安全生产压力分布,攻关相关配套工艺设备,实现安全有效注入;开展室内实验和PVT相态拟合,分析注天然气后天然气和原油性质变化规律,创新非混相驱组分数值模拟参数优化方法,开展带人工压裂裂缝的组分数值模拟,精准确定压力场分布,降低计量及监测不准带来的安全隐患;明确注气井气窜影响因素,优化注采参数,抑制油井气窜,降低生产风险,实现井控安全情况下的天然气驱环保高效开发。

Factors Analysis and Countermeasures of the Natural Gas Recycled Injection Well in Volatile Oil Reservoirs

This paper clarified the key factors of safe and environmental-friendly natural gas recycled injection well control in volatile oil reservoirs.The reinjection capacity of low permeability volatile reservoirs was quantified.The safe pressure distribution of each node at the injection port was determined,and the conquered pertinent process equipment,achieving safe and effective injection with the relevant supporting process equipment.The change rule of the crude oil and natural gas properties after gas injection was analyzed by laboratory experiments and PVT phase behavior fitting.The parameters was improved by numerical simulation of immiscible flooding.The distribution of the pressure field was determined accurately by compositional numerical simulation with artificial fractures,which can also reduce the hidden danger of imprecise measurement and monitoring.It showed the influence factors of the gas-channeling and the optimized injection and production parameters,suppressing gas channeling in oil wells,reducing the production risk,and finally achieving the efficient development of natural gas flooding under the control safety well condition.