海上油气田油压压降法SEC储量评估适用性分析

Applicability Analysis of SEC Reserve Evaluation Based on Oil Pressure Drop in Offshore Oil and Gas Fields

潘潞 田彬 刘方圆 刘若雨 邓新颖

PAN Lu TIAN Bin LIU Fangyuan LIU Ruoyu DENG Xinying

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

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

近年来应用容积法对海上油气田新增或开发早期的单井进行上市储量自评估，但部分小层仅单井控制，井控半径确定难度大，导致后期评估结果变化较大。因此，该文开展油压压降法研究，选取东海油气田已投产气井，根据前3年产量-油压关系曲线，计算外推至目前井口压力条件下的累计采气量，并将计算累产量与实际累采气量进行对比。结果表明，对于封闭岩性气藏，油压压降法误差相对较小，可以作为容积法的一种有效补充，提升储量评估精度。研究成果对新投产油气井SEC储量评估具有借鉴意义。

In recent years, the volume method is widely used to perform reserve evaluation on new wells and the wells in early development in offshore oil and gas fields. However, evaluation results are changeable of some thin layers controlled by single well because it is difficult to determine the well-spacing control radius. This paper took wells which have already been put into production in East China Sea Oilfield as examples, based on the production-oil pressure relation curves in recent three years, using oil pressure drop method, calculated the cumulative gas production under the current wellhead pressure condition. Then compared the results with the actual accumulated gas production. The results show for closed lithologic gas reservoirs, the oil pressure drop method is an effective supplement to volume method to improve the accuracy of reserve evaluation. The research results have reference significance for SEC reserve evaluation of new oil and gas wells.

https://doi.org/10.3969/j.issn.1008-2336.2023.01.016