复杂断块油藏CO2吞吐试验及效果分析

1989- 2001年间,中石化新星公司华东石油局在苏北溱潼凹陷复杂断块油藏开展了9井次CO2吞吐试验。介绍了高渗高含水、低渗透低产和稠油等3类油藏CO2吞吐的效果及其主要影响因素。高渗高含水油藏CO2吞吐后,能够降低含水率,增油控水效果显著,但需解决好腐蚀问题;低渗透低产油藏CO2吞吐后,可以提高油井产量,但需解决好二次污染问题;稠油油藏CO2吞吐后,可以提高原油产量,但需解决井筒原油脱气,防止井筒堵塞。试验结果表明,该项技术具有适用范围广、投资少、规模小和见效快等特点。在CO2资源充足的地区,适于推广CO2吞吐技术。

Trial and Effect Analysis of CO2 Huff and Puff in Complex Fault Reservoir

Between 1989 2001, CO 2 huff and puff technology has been done in nine wells in Qintong Sag of Subei Oilfield. The effect and affect actors have been introduced to three kinds of reservoirs such as high permeability and high water cut pools, low permeability and low production pools, viscous oil reservoir. In the high permeability and high water cut pools,CO 2 huff and puff can depress water cut and improve production, but the problem of corrosion must be take good care of. In the low permeability and low production pools, CO 2 huff and puff can improve production but must be solved the problem of secondary pollution. In the viscous oil reservoir, CO 2 huff and puff can improve production but must be solved the problem of oil degassing in the hole. Field testing indicate: this technology some characters with width using scope, smaller cost, smaller scale and quicker effect.