A productivity equation of horizontal wells in the bottom water drive reservoir with an interlayer

IF 2.4 4区工程技术 Q3 ENERGY & FUELS Journal of Petroleum Exploration and Production Technology Pub Date : 2024-01-06 DOI:10.1007/s13202-023-01742-y

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Abstract

The interlayer can effectively prevent the ridge of bottom water and has a non-negligible influence on the flow dynamics of oil and gas in the reservoir. In view of the above problems, this paper studies the influence of a bottom water reservoir with an interlayer on the critical productivity of horizontal wells and establishes a coupling model of seepage and wellbore flow in a bottom water reservoir with an interlayer. The critical productivity of horizontal wells in a bottom water reservoir with an interlayer can be evaluated more accurately. Firstly, the three-dimensional seepage field is approximately decomposed into internal and external seepage fields, and the critical productivity formulas of internal and external seepage fields are solved, respectively. Using the equivalent seepage resistance, the critical productivity formula of horizontal wells in interlayer bottom water reservoirs is obtained. The results are compared with the calculation results of the traditional productivity formula and the simulation results of the commercial software ECLIPSE. Second, based on the mass conservation principle and momentum conservation principle, the wellbore-reservoir coupling mathematical model of a horizontal well is established by the discrete method. Finally, the sensitivity analysis of the selected parameters is discussed in detail. The results show that: (1) compared with the traditional productivity algorithm, the algorithm considers the influence of interlayers on productivity and gives a detailed theory, a specific calculation process, and the importance of accurate prediction of wellbore flow. (2) The model is calculated by an example, and the calculation results are compared with the traditional formula and the commercial simulator ECLIPSE. The results show that the horizontal well productivity formula considering the influence of interlayer is closer to the simulation results of commercial software ECLIPSE, and the relative error is 8.56%. (3) The established coupling model considers the influence of interlayer radius length and horizontal well length. The general trend is that productivity gradually increases with an increase in interlayer radius length or horizontal well length, but the growth rate gradually decreases.

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带夹层底水驱动储层中水平井的产能方程

摘要夹层能有效防止底层水的脊化，对储层中油气的流动动态具有不可忽视的影响。针对上述问题，本文研究了带夹层底水储层对水平井临界产能的影响，建立了带夹层底水储层渗流与井筒流动耦合模型。可以更准确地评估带夹层底层储层中水平井的临界产能。首先，将三维渗流场近似分解为内渗流场和外渗流场，并分别求解内渗流场和外渗流场的临界产能公式。利用等效渗流阻力，得到层间底水储层中水平井的临界产能公式。结果与传统产能公式的计算结果和商业软件 ECLIPSE 的模拟结果进行了比较。其次，基于质量守恒原理和动量守恒原理，用离散法建立了水平井的井筒-储层耦合数学模型。最后，详细讨论了所选参数的敏感性分析。结果表明(1）与传统的产能算法相比，该算法考虑了层间对产能的影响，给出了详细的理论、具体的计算过程以及准确预测井筒流量的重要性。(2）通过实例对模型进行了计算，并将计算结果与传统公式和商业模拟器 ECLIPSE 进行了比较。结果表明，考虑层间影响的水平井产能公式与商业软件 ECLIPSE 的模拟结果较为接近，相对误差为 8.56%。(3）建立的耦合模型考虑了层间半径长度和水平井长度的影响。总的趋势是随着层间半径长度或水平井长度的增加，生产率逐渐提高，但增长率逐渐降低。

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来源期刊

Journal of Petroleum Exploration and Production Technology Multiple-

CiteScore

5.90

自引率

4.50%

发文量

151

审稿时长

13 weeks

期刊介绍： The Journal of Petroleum Exploration and Production Technology is an international open access journal that publishes original and review articles as well as book reviews on leading edge studies in the field of petroleum engineering, petroleum geology and exploration geophysics and the implementation of related technologies to the development and management of oil and gas reservoirs from their discovery through their entire production cycle. Focusing on: Reservoir characterization and modeling Unconventional oil and gas reservoirs Geophysics: Acquisition and near surface Geophysics Modeling and Imaging Geophysics: Interpretation Geophysics: Processing Production Engineering Formation Evaluation Reservoir Management Petroleum Geology Enhanced Recovery Geomechanics Drilling Completions The Journal of Petroleum Exploration and Production Technology is committed to upholding the integrity of the scientific record. As a member of the Committee on Publication Ethics (COPE) the journal will follow the COPE guidelines on how to deal with potential acts of misconduct. Authors should refrain from misrepresenting research results which could damage the trust in the journal and ultimately the entire scientific endeavor. Maintaining integrity of the research and its presentation can be achieved by following the rules of good scientific practice as detailed here: https://www.springer.com/us/editorial-policies