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对于水驱后深层高压轻油油藏来说,高压注空气(HPAI)是潜在有吸引力的提高采收率方法。评价HPAI的可应用性需要在油藏温度和压力条件下进行实验室试验,以便证实原油自燃和评价原油/储集岩系统的燃烧特性。随后估算在所考虑的油藏应用HPAI提高采收率的数值建模。一般通过燃烧在地下产生的烟道气形成非混相气驱,在该气驱中,挥发组分的汽提是主要开采机理。因此,在某些实例中,应用状态方程(EOS)法把HPAI模拟成等热烟道气驱,但是,这一方法忽略了燃烧及其对驱替和波及的影响。此外,EOS法不能预测何时在生产井出现氧突破或是否出现氧突破。在模拟中以计算时间和复杂性为代价,以有限的形式把燃烧考虑进去。在已有文献中一般在相当简化的条件下考虑燃烧,本文强调燃烧对HPAI提高采收率的作用,用具有实际地质特性的3D模型进行数值模拟。为了更实际地捕捉到燃烧前缘的物理过程,使用了具有动态网格划分能力的油藏模拟器。动力学参数是在燃烧管实验室试验基础上获得的。通过比较等热EOS-模拟和多组分燃烧运算,给出了燃烧对残余油、波及效率和预测的项目有效期限的影响。
High-pressure injected air (HPAI) is a potentially attractive method of enhanced oil recovery for water-flooded deep-high pressure light oil reservoirs. Evaluating the applicability of HPAI requires laboratory tests at reservoir temperatures and pressures to confirm the spontaneous combustion of crude oil and to evaluate the combustion characteristics of the crude oil / reservoir rock system. A numerical modeling of HPAI recovery recovery in the reservoir under consideration is then estimated. Non-miscible gas drives are typically formed by burning flue gases produced underground, where stripping of volatile components is the primary mining mechanism. Thus, in some instances, HPAI was modeled as an isothermal flue gas drive using the equation of state (EOS) method, however, this method ignores the effects of combustion and its effects on flooding and dispersion. In addition, the EOS method can not predict when oxygen breakthroughs occur in the production well or if oxygen breakthroughs occur. Take the combustion into account in a finite form at the expense of calculating time and complexity in the simulation. In the existing literature, combustion is generally considered under rather simplified conditions. This paper emphasizes the effect of combustion on enhanced oil recovery of HPAI, and simulates the 3D model with practical geological characteristics. In order to more effectively capture the physics of the combustion front, a reservoir simulator with dynamic meshing capabilities was used. Kinetic parameters are obtained on the basis of combustion tube laboratory tests. By comparing isothermal EOS-simulations and multicomponent combustion calculations, the effect of combustion on residual oil, sweep efficiency and predicted project life is given.