稠油出砂冷采技术的适用条件

CONDITIONS OF COLD PRODUCTION TECHNOLOGY FOR HEAVY OIL

稠油油藏能否适宜出砂冷采 ,主要取决于油藏能否形成蚯蚓洞网和泡沫油 ,这与储层、原油及开采条件密切相关。国外研究成果和河南新庄油田的开采实践表明 :泥质含量小于 10 % ,少或无钙质胶结的疏松储层及粒径小于 2mm的半胶结砂岩储层可进行出砂冷采 ;压力在 2 4～ 6 0MPa ,粘度为 5 0 0～ 5 0 0 0 0mPa·s,厚度大于 5m ,溶解气含气在 10m3 /t左右的油层也可考虑用此方法开采 ;另外 ,出砂冷采宜从油藏中心展开 ,尽量远离边水和气顶 (>2 0 0m)。

Based on field information,the reservoirs,which are suitable to cold recovery,are those whose formation are loose,gravel content is low,dead oil viscosity is 500～50 000 mPa.s,solution gas concentration in crude oil is about 10 m\+3/t,reservoir pressure is higher than 2 MPa,formation depth is 200～1 000 m.The effects of edge water and gas cap distribution on cold recovery of heavy oil are great,which are important factors to deploy oil wells and determine perforation interval and discharge capacity.This techique has extensive adaptability in such reservoirs as loose sandstone with solution gas.It is very important for the deployment of this technique to make clear the effects of geologic factors on cold recovery and establish relevant technical tactics.