一点法经验数优化方法在HD海域气田的应用研究

Optimization Method of Empirical Coeffcient in Single-point Method: A Case Study in the Gas Field of HD Sea Area

藤赛男 李元生

TENG Sainan LI Yuansheng

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院, 上海 200120; 中海石油(中国)有限公司上海分公司研究院, 上海 200030

Institute of Explorition and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China; Shanghai Branch of CNOOC Ltd., Shanghai 200030, China

HD海域已开发气田实施了大量回压试井和一点法试井。利用陈元千经验数或通过对实施过回压试井的气井取经验数的平均值作为气藏经验数来预测气井无阻流量，平均误差均超过20%。鉴于此，此文以无阻流量误差最小为目标，建立一点法经验数优化方法。通过对该海域X和Y气藏研究发现，X气藏和Y气藏最优经验数分别为0.083和0.15，无阻流量平均误差分别为4.3%和15%，比常规方法分别减小27.7%和40%。此研究可一定程度提高一点法产能评价的精度，对于提高一点法产能评价方法在气田的适应性具有一定的意义。

Back-pressure test and single-point test have been extensively implemented the Gas feld of HD Sea Area. There is more than 20% of average error occurred when the open-flow capacity of a gas well was predicted by the empirical coeffcient of Chen Yuanqian or average empirical coeffcient obtained from gas wells that have back-pressure test data. In view of this, the authors tried to look for a method that can optimize the empirical coeffcient in the single-point method and minimize the error of open flow capacity calculated. Case study of X gas feld and Y gas feld show that the optimal empirical coeffcient are 0.083 and 0.15 respectively, and the average error of open flow potential are 4.3% and 15% respectively, which are 27.7% and 40% less than that of the conventional method, respectively. The study of this paper not only improves the accuracy of capacity evaluation by single-point method, but also can enhance the adaptability of single-point in the gas feld.

https://doi.org/10.3969/j.issn.1008-2336.2016.04.056