稠油油田边部油井井筒乳化降黏技术研究及应用

Research and Application of Wellbore Emulsification and Viscosity Reduction Rechnology in the Edge of Heavy Oil Field

渤海某油田边部3口油井投产后产油量低,未达到预测水平。通过与同区块油井对比分析,研究出原因是油井原油黏度高,增加了井筒举升过程中的阻力,影响了电泵效率。优选成本低、降黏率高的井筒乳化降粘的技术工艺,其机理为乳化降粘和润湿降阻两方面。实验表明该复合型稠油助采剂加入定量比例的情况下,可形成黏度在10~100m P·s范围内的乳化体系;并且在温度30~60℃范围内,黏度水平稳定,降粘效果明显。3口油井实施后日均增油26m3,降粘增油效果显著。

After the three oil wells in the edge of a bohai oil field were put into production,the oil production was low and did not reach the predicted level. Compared with the oil wells in the same block,it is found that the high viscosity of the oil well increases the resistance during the wellbore lifting process and affects the efficiency of electric pump.The technology of wellbore emulsification and viscosity reduction with low cost and high viscosity reduction rate is optimized. The mechanism is emulsification and viscosity and wetting resistance reduction. The experimental results show that the emulsion system with a viscosity in the range of 10-100 mP.s can be formed when the complex heavy oil recovery aid is added in a quantitative proportion,and the viscosity level is stable and the viscosity reduction effect is obvious in the temperature range of 30-60℃.After the implementation of three oil wells,the average daily oil increase is 26 m3,and the effect of viscosity reduction and oil increase is significant.