改善稠油渗流流变性的试验

Experimental study of improving rheological characteristics of heavy oil's percolation flow

王步娥 郑惠光

Wang Bu'e Zheng Huiguang

稠油的非牛顿性质是造成稠油油藏采油速度低、采收率低的一个重要原因。ZHSS-01表面活性剂体系能在较宽的温度范围(30～71℃)、较高的矿化度(16×10 mg/L)和较高硬度(1.1×10 mg/L)条件下,与稠油形成水包油型乳状液,降粘效率达98%以上,有效地改善了稠油在井周地带的渗流流变性,降低了稠油在近井地带的渗流阻力,提高开采速度。试验表明,应用 ZHSS-01表面活性剂进行驱油可提高采收率3%以上。

Non-Newtonian flow characteristic of heavy oil is the main reason resulting in low oil recovery rate and low recovery factor in heavy oil reservoir.ZHSS-01 surfactant system can form reverse emulsion when it is mixed with heavy oil in the reservoir in a relatively wide range of temperature(30-71℃),relatively high salinity(16×10 mg/ L)and relatively high hardness of water (1.1×10 mg/L),which would lead to a viscosity breaking effectiveness of over 98%.As a result,the rheological characteristics of percolation flow of heavy oil around the wellbore can be improved,fihrational resistance of heavy oil in the vicinity of the wellbore is lowered,and oil production rate is increased.Experimental study shows that recovery factor can be enhanced over 3 % when heavy oil being displaced with ZHSS-01 surfactant system.

10.11743/ogg20050318