小型燃气发电设备在海上油田伴生气回收利用中的应用与经济性分析

The Application of Small Gas-based Power Generators in Recovering Offshore Oilfield Associated Gas and Economic Analysis

海上油田开采过程中常有伴生气产出,小型燃气发电设备可有效利用少量伴生气,降低主电站的原油和柴油消耗。常见的小型燃气发电设备主要有往复式燃气发电机组、双燃料发电机组、燃气轮机发电机组等。结合SY/T 6473-2009《石油企业节能技措项目经济效益评价方法》,对小型燃气发电设备的适用性和经济性进行分析。分析结果表明,伴生气日产量2000~5000m^3的海上油田,适合选用微型燃气轮机;伴生气日产量3000~20000m^3,适合选用往复式燃气发电机组;伴生气日产量2×10~4m^3及以上的海上油田,选用轻型燃气轮机可实现伴生气的有效利用;双燃料发电机组对于伴生气日产量低于2×10~4m^3的海上油田尚不能实现经济性利用。

Offshore oilfield production is often accompanied by output of associated gas.Small gas-based pow-er generators can effectively utilize small amounts of associated gas and reduce crude oil and diesel oil con-sumption for the principal power station.Commonly used small gas-based power generators include reciprocat-ing gas-based power generating sets,dual-fuel generating sets and gas turbine generating sets.Based on the SY/T 6473 — 2009 Economic Benefit Assessment Method for Oil Companies＇Technical Energy Saving Projects,this article takes a look at the applicability and economics of small gas-based power generators.Analysis shows that mini gas turbines are suitable for offshore oilfields with daily associated gas output ranging from 2000 to 5000m^3,reciprocating gas-based power generating sets are suitable for offshore oilfields with daily as-sociated gas output ranging from 3000 to 20000m^3,and that light gas turbines can help achieve effective utilization of associated gas for offshore oilfields with daily associated gas output of 2 ×10~4m^3 or higher.Offshore oilfields with daily associated gas output lower than 2 ×10~4m^3 are still unable to achieve an economic utilization of dual-fuel generating sets.