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Performance of a gas-lifted oil production well at steady state
Journal of Petroleum Exploration and Production Technology ( IF 2.2 ) Pub Date : 2021-06-04 , DOI: 10.1007/s13202-021-01188-0
Asekhame U. Yadua , Kazeem A. Lawal , Stella I. Eyitayo , Oluchukwu M. Okoh , Chinyere C. Obi , Saka Matemilola

Although gas-lift is an established technology for improving the performances of oil production wells, the simplicity, robustness and accuracy of gas-lift models remain to be fully resolved. As an improvement on the traditional practice, this paper proposes a new approach for modelling the performance of gas-lifted wells at steady-state conditions. The conceptual framework splits the wellbore into two segments. The segments are of unique characteristics, yet they are hydraulically connected. While one segment is controlled primarily by the upstream reservoir-sandface conditions, the dynamics of the second segment are dominated by the lift-gas. This work results in a new four-phase model and an accompanying workflow for analysing the steady-state performance of a gas-lifted well. Using examples from fields operating under diverse conditions in the Niger Delta and North Sea, the new model is validated against a commercial wellbore performance simulator and actual field results. The new model yields average absolute deviation (AAD) of 2.7 and 5.4% against the commercial simulator and field results, respectively. Notwithstanding its relative simplicity, the range of AAD recorded for the new model and workflow attests to its robustness and applicability in practice. In addition to its simple mathematical form, a competitive feature of the proposed model relative to the commercial simulator and most other models is that it accounts for the four phases (gas, oil, water and solid particulates) typically encountered in mature oil production wells and brown fields.



中文翻译:

气举采油井稳态性能

尽管气举是提高采油井性能的成熟技术,但气举模型的简单性、鲁棒性和准确性仍有待完全解决。作为对传统做法的改进,本文提出了一种新的方法来模拟气举井在稳态条件下的性能。概念框架将井眼分为两个部分。这些段具有独特的特性,但它们是液压连接的。虽然一个段主要由上游储层-砂面条件控制,但第二个段的动力学由举升气主导。这项工作产生了一个新的四相模型和一个伴随的工作流程,用于分析气举井的稳态性能。使用在尼日尔三角洲和北海不同条件下作业的油田示例,新模型通过商业井筒性能模拟器和实际油田结果进行了验证。与商业模拟器和现场结果相比,新模型的平均绝对偏差 (AAD) 分别为 2.7% 和 5.4%。尽管相对简单,但为新模型和工作流程记录的 AAD 范围证明了其在实践中的稳健性和适用性。除了其简单的数学形式外,所提出的模型相对于商业模拟器和大多数其他模型的竞争特征是它考虑了成熟采油井中通常遇到的四个阶段(气、油、水和固体颗粒)和棕色的田野。新模型已根据商业井筒性能模拟器和实际现场结果进行了验证。与商业模拟器和现场结果相比,新模型的平均绝对偏差 (AAD) 分别为 2.7% 和 5.4%。尽管相对简单,但为新模型和工作流程记录的 AAD 范围证明了其在实践中的稳健性和适用性。除了其简单的数学形式外,所提出的模型相对于商业模拟器和大多数其他模型的竞争特征是它考虑了成熟采油井中通常遇到的四个阶段(气、油、水和固体颗粒)和棕色的田野。新模型已根据商业井筒性能模拟器和实际现场结果进行了验证。与商业模拟器和现场结果相比,新模型的平均绝对偏差 (AAD) 分别为 2.7% 和 5.4%。尽管相对简单,但为新模型和工作流程记录的 AAD 范围证明了其在实践中的稳健性和适用性。除了其简单的数学形式外,所提出的模型相对于商业模拟器和大多数其他模型的竞争特征是它考虑了成熟采油井中通常遇到的四个阶段(气、油、水和固体颗粒)和棕色的田野。分别为商业模拟器和现场结果的 4%。尽管相对简单,但为新模型和工作流程记录的 AAD 范围证明了其在实践中的稳健性和适用性。除了其简单的数学形式外,所提出的模型相对于商业模拟器和大多数其他模型的竞争特征是它考虑了成熟采油井中通常遇到的四个阶段(气、油、水和固体颗粒)和棕色的田野。分别为商业模拟器和现场结果的 4%。尽管相对简单,但为新模型和工作流程记录的 AAD 范围证明了其在实践中的稳健性和适用性。除了其简单的数学形式外,所提出的模型相对于商业模拟器和大多数其他模型的竞争特征是它考虑了成熟采油井中通常遇到的四个阶段(气、油、水和固体颗粒)和棕色的田野。

更新日期:2021-06-04
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