多层油藏层间压力变异系数评价方法研究与应用
Research and application of evaluation method of interlayer pressure variation coefficient in multi-layer reservoirs
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- 引用格式:
-
蔡晖,石洪福.多层油藏层间压力变异系数评价方法研究与应用[J].天然气与石油,2022,40(3):75-79.doi:10.3969/j.issn.1006-5539.2022.03.012
CAI Hui, SHI Hongfu.Research and application of evaluation method of interlayer pressure variation coefficient in multi-layer reservoirs[J].Natural Gas and Oil,2022,40(3):75-79.doi:10.3969/j.issn.1006-5539.2022.03.012
- DOI:
- 10.3969/j.issn.1006-5539.2022.03.012
- 作者:
- 蔡晖 石洪福
CAI Hui, SHI Hongfu
- 作者单位:
- 中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300459
Bohai Petroleum Research Institute, CNOOC China Ltd., Tianjin Branch, Tianjin, 300459, China
- 关键词:
- 多层油藏;压力差异;洛伦兹曲线;归一化;定量表征
Multi-layer reservoirs; Pressure difference; Lorentz curve; Normalization; Quantitative characterization
- 摘要:
压力是油藏开发的核心内容之一,目前油田开发效果评价中,对油藏压力的评价主要采用物质平衡方法、测压方法和试井分析方法等,考察油田整体地层压力保持情况,主要以原始地层压力和泡点压力作为界限值。目前这种评价方式过于笼统,缺乏对纵向上小层间压力差异程度的考察和评价,事实上非均质油藏开发过程中,层间压力差异客观存在而且会逐步加剧成为制约油田开发效果提高的主要因素。这种层间压力差异对纵向上各层的动用状况和安全生产都造成很大的影响。借鉴经济学基尼系数计算方法,提出了一种基于洛伦兹曲线的评价油藏层间压力差异程度方法。首先将测试层位进行标准化,其次将压力数值进行累积求和,然后绘制层间压力差异程度洛伦兹曲线,最后计算层间压力变异系数。该方法不但能够对大量数据进行处理,而且能够实现对油藏层间压力变异系数的归一化(0～1)的定量表征,从而为油田注采优化等决策提供直观支持。
Pressure is one of the core contents in oil reservoir development. At present, material balance, pressure measurement, and well test analysis methods are used for the evaluation of oil reservoir pressure. The original formation pressure and bubble point pressure are used as the limit values to examine the overall formation pressure maintenance in the field. Currently, this evaluation method is too general and lacks the investigation and evaluation of the degree of pressure difference between small layers in the vertical direction. In fact, in the development process of heterogeneous reservoirs, the pressure difference between layers objectively exists and will gradually aggravate to restrict the improvement of oilfield development effects. The interlayer pressure difference degree has a great influence on the water flooding status and safety production of the vertical layers. In this paper, a method of evaluating reservoir interlayer pressure varia based on Lorentz curve is proposed by referring to economic Gini calculation method. Firstly, the test layers were standardized, then the pressure values were accumulated and summed, then the Lorentz curve of pressure difference degree was drawn. Finally, the pressure difference coefficient was calculated. This method can not only process big data, but also realize the normalized(0～1) quantitative characterization of the reservoir interlayer pressure variation coefficient, so as to provide intuitive support for the decisionmaking of injection and production optimization in oil field.
