靖安油田Q1区空气泡沫驱用起泡剂的优选与应用

The Optimization and Application of Foaming Agent for Air Foam Flooding in Q1 Area of Jing’an Oilfield

靖安油田Q1区位于中国西部鄂尔多斯盆地陕北油气叠合富集带,是一个低渗、低压、低丰度的“三低”岩性油藏。现用的AES起泡体系是由AES起泡剂和PAM稳泡剂独立复配而成,施工难度大且低温流动性差,因此优选出了适合Q1区的新型CSGY-FPJ泡沫体系。研究结果表明,CSGY-FPJ起泡剂在起泡性能、表面张力、低温流变性能等方面都明显优于AES起泡剂。通过物模试验可知,当空气泡沫驱注入量为1.0 PV时,CSGY-FPJ泡沫体系和AES泡沫体系的采收率分别为37.5%和32%,继续水驱后最终采收率提高了5.9%。2015年11月,A4、A5注入井开始现场试验,试验后对应油井生产形势变好,液量稳定,含水率下降(由59.7%下降至57.8%),日增油0.94 t。空气泡沫驱在低渗油层的开发中具有很重要的意义,该研究对低渗油藏的增产具有借鉴作用。

Q1 Area of Jing’an Oilfield was located in the oil and gas folded and enriched belt of Northern Shaanxi in Ordos Basin of Western China,which was a low permeability,low pressure,low abundance(three low properties)lithologic reservoir.The AES foaming system was mixed with the AES foaming agent and foam stabilizer PAM independently;it was difficult for operation and poor flowing at low temperature,so the new CSGY-FPJ foam system was chosen for Q1 Area.The results showed that the CSGY-FPJ foaming agent was better than that of AES foaming agent in the foaming properties,surface tension,and low-temperature rheological properties.The physical model experiment indicated that as the air foam flooding injection volume was 1.0 PV,the recovery rate of CSGY-FPJ foam system and AES foam system was 37.5%and 32%respectively;after water flooding the recovery increased by 5.9%.In November,2015,field tests were carried out in A4 and A5 Injection Wells.After the test,the production in the corresponding wells is improved,the fluid volume is stable,and the water content decreases from 59.7%to 57.8%,and the daily oil increment is 0.94 t.Air foam flooding is very important in the development of low permeability reservoir.This study can be used as a reference for the production of low permeability reservoirs.