基于试井技术的DST测试产能校正方法  

DST productivity correction method based on well test technique

作　　者：刘斌 常涛 曲炳昌 刘春艳 李金蔓 LIU Bin;CHANG Tao;QU Bingchang;LIU Chunyan;LI Jinman(Tianjin Branch Company of China National Offshore Oil Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司

出　　处：《石油钻采工艺》2019年第1期83-88,共6页Oil Drilling & Production Technology

基　　金：国家科技重大专项"渤海油田高效开发示范工程"(编号:2016ZX05058)

摘　　要：海上油田DST测试时间短,利用短时间的DST测试资料来评价油井的生产能力存在一定的不确定性。为了更加精确地确定DST测试产能校正系数,以定向井为研究对象,引入不稳定试井技术,把测试时间、边界条件和稳定产能相联系,给出了针对实际油藏多种边界情况下较为通用的DST测试产能校正系数计算新方法,并与前人的公式计算法进行了对比。研究结果表明,校正系数随测试时间的变化受油藏参数及边界条件综合影响,对于短时间的测试,流度越小校正系数越小,泄流面积越小校正系数也越小;对于低流度和存在封闭边界的油藏,新方法校正结果与现有方法计算结果差异较大,新方法误差仅为2.3%,现有方法误差超过25%。实例分析表明,新方法计算的校正系数与实际情况吻合较好,且比公式计算法适用范围更广,具有较好的应用价值。Drill stem test(DST)in offshore oilfields lasts short.The evaluation results are,to some extent,uncertain,if the DST data of short time is used to evaluate the productivity of oil wells.In order to determine the DST productivity correction coefficient more accurately,a directional well was taken as the research object in this paper.The transient well test technique was introduced to set up relations between test time,boundary condition and stable productivity.Then,a new method for calculating DST productivity correction coefficient that is general for the actual oil reservoirs with various boundaries was developed and compared with the previous formula calculation method.It is indicated that the relation between the correction coefficient and the test time is affected comprehensively by oil reservoir parameters and boundary conditions.As for short-time test,the correction coefficient decreases with the decrease of fluidity and drainage area.As for the low-fluidity oil reservoirs with closed boundary,the correction results of the new method are more different from the calculation results of existing methods,and the new method is more accurate.The case study results show that the correction coefficient calculated by the new method is accordant with the actual situation.What’s more,the new method is applicable in wider range than the formula calculation method and its application value is higher.

关 键 词：DST测试 产能评价 校正系数 不稳定试井 边界影响 

分 类 号：TE353[石油与天然气工程—油气田开发工程]