大庆萨北过渡带复合热载体吞吐适应性研究

 大庆萨北过渡带已进入高含水期并且产量递减速度较快，在模拟地层条件下，进行了不同焖井时间的复合热载体吞吐室内实验。通过对复合热载体吞吐的采收率、含水率、生产气油比等指标进行评价，探索了该油藏进行复合热载体吞吐开采的可行性。结果表明：复合热载体吞吐对于开采该油藏具有非常好的效果，但其效果与焖井时间、吞吐周期有关。复合热载体吞吐焖井时间太短或过长效果都比较差。在同样条件下，复合热载体吞吐焖井时间增加，含水率、气油比降低，当焖井时间达到一定时间后，含水率、气油比增加。随着吞吐周期增加，采收率降低，含水率、气油比增加。对于大庆萨北过渡带，焖井时间为150 s 时效果最好，吞吐3 个周期。

Adaptability of the Composite Heat Carrier Huff and Puff in Daqing Sabei Transitional Zone

The reservoir development in Daqing Sabei transitional zone is now in the high water cut period, and the production declines rapidly. Under such situations, the composite heat carrier huff and puff in-house experiments are carried out to achieve a better reservoir performance. Through the evaluation of the recovery rate, the water cut and the production gas-oil ratio, the feasibility of the composite heat carrier huff and puff in Sabei transitional zone is explored. It is shown that the composite heat carrier huff and puff enjoys a very good performance, which depends highly on the soak time and the huff and puff cycles. The over-time or too-shorttime well soak will both result in a poor performance. Under the same conditions, the water cut and the production gas-oil ratio decline with the increase of the soak time. When the soak time goes over 150 s, the water cut and the production gas-oil ratio will increase. With the increase of the huff and puff cycle, the oil recovery, the water cut and the gas-oil ratio increase. The optimal soak time for the Daqing Sabei transitional zone reservoir is 150 s, with the highest recovery and the lowest production gas-oil ratio and the huff and puff cycles should be three or four periods and three cycles for the best result.