A new calculation model of CO<sub>2</sub> huff and puff injection volume in high water-cut horizontal wells based on improved volume method

Jin Yong; Wang Zhilin; Jin Zhongkang

doi:10.13809/j.cnki.cn32-1825/te.2019.03.004

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A new calculation model of CO₂ huff and puff injection volume in high water-cut horizontal wells based on improved volume method
Vol. 9, Issue 3, Pages: 19-24(2019)
Published：2019
DOI： 10.13809/j.cnki.cn32-1825/te.2019.03.004
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DOI：

Jin Yong, Wang Zhilin, Jin Zhongkang. A new calculation model of CO₂ huff and puff injection volume in high water-cut horizontal wells based on improved volume method[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(3): 19-24. DOI： 10.13809/j.cnki.cn32-1825/te.2019.03.004.

摘要

水平井CO

吞吐

尤其在井网不完善的小断块油藏、薄互层油油藏中

是对于CO

驱替的一种有效的技术补充手段。对于高含水水平井

针对现有的水平井CO

吞吐注入量设计的快速计算方法“椭圆柱体模型法”的三个局限性

提出了基于改进的柱体模型的CO

注入量设计新公式。将该公式计算的最优注气量与数值模拟方法的优化结果相比

计算误差率小于10 %

可满足工业设计需要

同时相比于旧模型的计算精度显著提升。应用新公式设计J油田典型高含水水平井S49P1井的CO

吞吐剩余油挖潜方案

获得良好的增油效果及经济效益

验证了该改进模型的适应性与可靠性。新模型的建立可为同类型水平井CO

吞吐方案的制定提供精度更高的工程计算工具。

Abstract

huff and puff in horizontal wells

especially in small fault block reservoirs with imperfect well pattern and thin inter bed oil reservoirs

is an effective technical supplement for CO

flooding. For high water-cut horizontal wells

as there are three limitations of the ″elliptical cylinder model method″—a fast calculation method for the design of CO

injection volume in horizontal wells

a new CO

injection volume calculation formula based on the improved cylinder model is proposed. Compared with the optimized results of numerical simulation method

the calculated error rate of the new formul

a is less than 10 % so as to meet the needs of industrial design. Besides

compared with the old model

the calculation accuracy is enhanced considerably. The new formula is used to design the CO

huff and puff scheme of remaining oil development of well S49P1

a typical high water-cut horizontal well in J oilfield. And a good incremental oil effect and economic benefit was achieved

which verifies the adaptability and reliability of the improved model. The establishment of the new model can provide a more accurate engineering calculation tool of CO

injection volume for CO

huff and puff in other horizontal wells with high water-cut.