Waterflood Direction and Front Characterization With Four-Step Work Flow: A Case Study in Changqing Oil Field China
Waterflood Direction and Front Characterization With Four-Step Work Flow: A Case Study in Changqing Oil Field China
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DOI：
10.2118/178053-pa
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发表时间：
2017-08-01
影响因子：
2.1
通讯作者：
Yu, Haiyang
中科院分区：
文献类型：
--
作者：
He, Youwei;Cheng, Shiqing;Yu, Haiyang
由于低渗透油藏储层非均质性和裂缝的影响，高含水条件下有效表征水驱方向和前缘已成为一个具有挑战性的问题。为了更好地理解这一复杂问题，开发了一个包含统计和数值技术的工作流程，利用流量和井底压力（BHP）数据来表征长庆油田的水驱方向和前缘分布。该工作流程包括4个步骤：首先，利用动态分析定性研究注采井之间的关系;然后，利用约束多元线性回归（MLR）方法计算井间连通系数，并通过产量和注入量定量描述水驱方向。在前两步计算结果的基础上，我们可以采用数值试井作为第三步，对流量和BHP数据进行处理，以表征水驱方向和前缘。最后，在上述三种方法研究成果的基础上，采用流线法模拟了水驱前缘和高渗通道的分布，与单一方法相比，该工作流程为全面深入地研究水驱油藏提供了更多的视角和方法。通过该工作流程取得的成果，使长庆油田W16井组的注水开发管理更加主动、更加完善，生产井含水下降的同时，相对于2015年的现场数据，产量增加了近40%。通过该工作流程获得的信息，可以帮助操作人员对井网优化、注采参数调整等注水开发管理做出更加合理的决策。
Because of the effect of reservoir heterogeneity and fractures in low-permeability reservoirs, effective characterization of waterflood direction and front has become a challenging issue under high-water-cut condition. To achieve better understanding of such a complex problem, a work flow, containing statistical and numerical techniques, is developed to characterize waterflood direction and front distribution in Changqing oilfield by using both flow rates and bottomhole-pressure (BHP) data. The work flow includes four steps: First, dynamic analysis is used to qualitatively investigate the relationships between injector and producers; then, the constraint multiple-linear-regressions (MLR) method is applied to calculate the interwell-connectivity coefficients, which was used to quantitatively describe the waterflood direction by production and injection rates. On the basis of the results of the two former steps, we can adopt numerical well testing as our third step to deal with flow rates and BHP data to characterize the waterflood direction and front. Finally, the streamline method is used to simulate the waterflood front and high-permeability-channel distribution on the basis of the outcome of the three preceding techniques.Compared with individual methods, the proposed work flow can offer more perspectives and ways to make a comprehensive and deep investigation of the waterflood reservoir. The results obtained by this work flow enable proactive and better waterflood management in the Well Group W16 in Changqing oil field; namely, the water cut of producers decreases, meanwhile the oil production increases by nearly 40% referring to the field data in 2015. With the help of the information obtained by this work flow, operators could make more-reasonable decisions on waterflood management such as well-pattern optimization and injection-production parameters adjustment.