空气-原油伴生气低温氧化反应安全性分析

Safety Analysis of LTO of Air and Oil-associated Gas

针对试验区空气驱中的安全问题,根据原油伴生气组分,结合工业气体爆炸条件和理论计算方法,从爆炸极限和临界含氧量分析了试验区空气驱的安全性。结果表明:常温常温下试验区内的原油伴生气爆炸极限为[2.38%,9.55%],油田温压系统下的爆炸极限为[2.20%,11.29%],爆炸极限范围增大1.91个百分点(7.18%→9.09%)。其理论临界含氧氧量范围为[8.25%,9.41%],作图估算法的为[8.66%,10.15%],较理论计算值高出0.41~0.74个百分点,平均高0.62个百分点,为确保试验区空气驱的安全性,取其最小含氧量8.25%,完全可满足矿场要求的含氧量安全范围(10%)。该成果为空气驱-原油伴生气安全性的快速判断提供一重要的理论依据,同时也指导了试验区空气驱提高采收率技术的可行性。

According to the safety problem in the air flooding of the test area, the safety of the air drive in the test area was analyzed from the explosion limit and the critical oxygen content based on the explosive composition of the crude oil and the industrial gas explosion conditions and theoretical calculation methods. The results showed that the explosion limit of crude oil associated with the test zone at normal temperature and normal temperature was [2.38%, 9.55%], the explosion limit of the oilfield temperature and pressure system was [2.20%, 11.29%], and the explosion limit range was increased by 1.91 percentage points(7.18% → 9.09%). The theoretical critical oxygen demand range was [8.25%, 9.41%], and that of the graph estimation method was [8.66%, 10.15%], which was 0.41~0.74 percentage points higher than the theoretical calculation value, and the average increase was 0.62 percentage points. To ensure the safety of the air drive in the test area, the minimum oxygen content was 8.25%, which could fully meet the safety requirement of the production(10% oxygen content). This achievement provides an important theoretical basis for the rapid judgment of the safety of air flooding-crude oil associated with gas, and also increases the feasibility of enhanced oil recovery technology in the test area.