蒙古林砂岩油藏整体调堵的现场实践

蒙古杜砂岩油藏为薄层状弱边水普通稠油油藏,该油藏层间渗透率差异大,油水粘度比224。投入注水开发后,注入水指进速度快,水驱效果差。针对上述情况,研制了适合该油藏的调堵剂,并对调堵剂的交联时间、凝胶体粘度、热稳定性及其在多孔介质中的封堵程度等性能进行了测试与评定。对如何防止或减少调堵剂对中、低渗透层的伤害问题进行了论述,提出了相应的工艺措施,并提出了依据室内模拟试验和油藏特征确定注入压力的新方法。经现场实践,较好地解决了蒙古林砂岩油藏层间矛盾突出的问题。

FIELD PRACTICE OF INTEGRAL PROFILE CONTROL AND WATER SHUTOFF IN MONGGULIN SANDSTONE RESERVOIR

Monggulin sandstone reservoir is a thin layered heavy oil reservoir with weak edge water. The permeability in different layers in this reservoir is very different, and the oil-water viscosity ratio is 224. After putting into waterflood production, the water fingered forward rapidly, the waterflood effect was poor. There fore, a profile control and water shutoff agent suitable for this reservoir was developed. Meanwhile, properties such as the crosslinking time of the agent, the viscosity of the gel, the thermal stability and the plugging degree of the agent in the porous media and so on were tested and evaluated. This paper demonstrates the method how to prevent or reduce the damage of the agent to the low and middle permeability formations, presents the corresponding technologic measures, and also puts forward the new method for determining the injection pressure based on the lab simulation test and reservoir features. Field test proved that the contradiction between layers of Monggulin sandstone reservoir had been successfully resolved.