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

摘要: 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。

Abstract: 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.