【摘要】 为了有效利用水气交替技术提高低渗透、非均质性油藏的采收率,引入注入速度差异控制(AOIR)、段塞比变化的水气交替驱(TWAG)和AOIR-TWAG技术研究了提高采收率的可行性。结果表明,渗透率变异系数越大,水气交替驱相对于连续注气驱的效果越好,3种技术的采收率均高于常规的水气交替驱。但是,如果考虑经济效益,则只有AOIR和AOIR-TWAG技术的净现值高于常规的水气交替驱。通过新疆油田某油藏的模拟验证了概念模型研究的可行性,对提高低渗透、非均质性油藏气驱波及体积具有指导意义。更多还原

【Abstract】 In order to make effective and full use of the technique of water-alternating-gas(WAG) to enhance the oil recovery of low-permeability and heterogeneous reservoirs,the techniques such as allocation of injection rates(AOIR),tapered water-alternating-gas(TWAG) and AOIR-TWAG are introduced to study the feasibility of the technologies in enhancing oil recovery.The results show that the more the permeability variation coefficient is,the better the effects of WAG will be,corresponding to the continuous gas injection and flooding,all the recovery factors of the above three technique are higher than that of the conventional WAG.But if taking the economic benefit into consideration,only the net present values of AOIR and the combination of AOIR and TWAG are better than the constant WAG flooding.And moreover the feasibility of the conceptual model is proven by the simulation of an oil reservoir of Xinjiang Oilfield,therefore the achievements stated above possess a certain guiding significance for enlarging the swept volume of the gas flooding in low-permeability and heterogeneous oil reservoirs.更多还原