小洼油田中—深层特稠油多元热流体吞吐技术研究与应用

Multi-Component Thermal Fluid Huff-Puff Technology and Its Application in Xiaowa Oilfield

多元热流体吞吐技术在海上油藏已有较大范围应用,但在陆上中-深层特稠油油藏中还缺乏经验,应用较少。以辽河小洼稠油油藏为例,运用数值模拟方法建立典型地质模型,对陆上中-深层特稠油油藏多元热流体吞吐技术进行研究。建立多元热流体吞吐选井依据,对措施注入参数进行优化。结果显示,注入温度控制在355℃以下,干度控制为0. 4,提高气体组分中CO2含量,控制注入速度为5 t/h,周期累计注入量为1 000 t,气汽比为600 m3/t,焖井时间为3~5 d时,对油藏有显著的提温增压效果。多元热流体技术在辽河小洼稠油油藏应用后单井增油明显,可为同类油藏改善开发效果提供借鉴。

Multi-component thermal fluid huff-puff technology has been widely applied in the offshore reservoirs,but it lacks experiences and field application in the onshore medium-deep heavy oil reservoirs. Based on the Xiaowa heavy oil reservoir in the Liaohe Oilfield,a typical geological model was established by numerical simulation to study the multi-component thermal fluid huff-puff application for the medium-deep extra-heavy oil reservoirs. The well selection basis for multi-component thermal fluid huff-puff was proposed and the injection parameters were optimized. Research indicates that it shows a favorable heating-pressurizing performance when the injection temperature is controlled below 355 ℃,the steam quality is 0.4,increasing the CO2 content in the gas component,the injection rate is 5 t/h,the cumulative injection volume is 1 000 t in an injection period,the gas-steam ratio is 600 m3/t and the soaking time is 3 ~ 5 d. The multi-component thermal fluid huff-puff indicates a favorable performance in individual-well oil enhancing in the Xiaowa reservoir of Liaohe Oilfield,which could provide certain reference for the performance improvement of similar reservoirs.