氮气泡沫复合驱用稳泡剂的研制与应用

Development and Application of Stabilizer for Nitrogen Foam Compound Flooding

针对中深层边底水裂缝性油藏应用氮气泡沫复合驱时,泡沫体系耐温能力差和泡沫不稳定等难题,研制了适宜的稳泡剂复配体系。通过试验得出,泡沫体系加入稳泡剂后, 120℃高温条件下发泡体积达到900 mL以上,泡沫半析水期1 100 s以上,耐矿化度10×10^4 mg/L,阻力因子20.69。该体系在HST区块进行了先导试验和推广应用,可提高中深层边底水裂缝性油藏的注水效果,截止2018年10月,共实施氮气泡沫复合驱20井组,累计增产原油2.37×10^4 t。

A suitable foam compound system is developed to solve the problems such as poor temperature resistance and foam instability when nitrogen foam compound flooding is applied to the fractured oil reservoir in the middle and deep bottom water.The experimental results show that the foam system after joining stabilized foam agent,under the condition of 120 ℃ high temperature foam volume reached more than 900 mL,foam drainage period more than 1 100 s, resistant to salinity reached 10 ×10^4 mg/L,the resistance factor of 20.69.This system has conducted pilot test and extended application in HST block, which can improve the water injection effect of the fractured reservoir in the middle and deep bottom water.By October, 2018,total nitrogen foam compound flooding 20 well group was implemented,and the crude oil production was increased by 2.37×10^4 t.