Semianalytical Model for Monitoring Fracture Liquid-Loading in Vertical Fractured Gas Wells

IF 2.1 4区工程技术 Q3 ENERGY & FUELS

SPE Reservoir Evaluation & Engineering Pub Date : 2023-02-01 DOI:10.2118/214318-pa

Zhipeng Wang, Z. Ning, Wen-ming Guo

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引用次数: 2

Abstract

Liquid loading seriously affects gas wells production and even causes gas wells abandonment. Many researchers still focus on correcting a critical liquid-loading flow rate to alleviate these problems. However, they still cannot reasonably be explained. Gas flow rate is higher than the critical liquid-loading flow rate, but liquid loading can still occur. Therefore, until an accurate critical fluid-loading flow rate is discovered, we should monitor the fluid-loading phenomenon to prevent it from affecting production gas wells’ performance. In this work, a fracture liquid-loading monitoring (FLLM) model is proposed and solved for the timely monitoring of fracture liquid-loading (FLL) positions and volume. The Newman product and Green function methods are used to develop and solve the FLLM model. The fracture is discretized into 2nxnz grids to describe an FLL volume and position. The numerical simulation method is used to verify the accuracy of the FLLM model. As a result, four innovative flow regimes, including fracture cavity liquid-loading flow, fracture root liquid-loading flow, transitional flow considering fracture cavity liquid-loading flow, and transitional flow considering fracture root liquid-loading flow, are identified on the pressure response curves. The pressure response of the same gas well at different times is well matched by the model in this paper, and the obtained parameters are more reasonable. The FLLM model can correct for magnified permeability, shortened half-length, and magnified wellbore storage coefficient. In conclusion, the FLLM model is established to monitor FLL, and alert engineers to remove liquid loading on time to prevent water from suddenly rushing into a wellbore and causing gas wells abandonment.

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垂直压裂气井裂缝液载监测半解析模型

注液严重影响气井生产，甚至导致气井弃井。为了缓解这些问题，许多研究者仍然致力于修正一个临界的液体加载流量。然而，他们仍然不能合理地解释。气体流量高于临界充液流量，但仍可发生充液。因此，在找到准确的临界充液流量之前，应对充液现象进行监测，防止其影响生产气井的生产性能。本文提出并求解了裂缝液载监测(FLLM)模型，用于裂缝液载位置和体积的实时监测。采用纽曼积法和格林函数法建立求解FLLM模型。裂缝被离散成2nxnz网格来描述FLL的体积和位置。采用数值模拟方法验证了FLLM模型的准确性。结果表明，在压力响应曲线上确定了裂缝腔液载流、裂缝根部液载流、考虑裂缝腔液载流的过渡流和考虑裂缝根部液载流的过渡流四种创新流型。本文模型对同一气井不同时间的压力响应拟合较好，得到的参数更为合理。FLLM模型可以校正放大的渗透率、缩短的半长和放大的井筒储存系数。综上所述，本文建立了FLLM模型，用于监测井内浮力，提醒工程师及时清除液体载荷，防止水突然涌入井筒，导致气井弃井。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

SPE Reservoir Evaluation & Engineering 工程技术-地质学

CiteScore

5.30

自引率

0.00%

发文量

审稿时长

12 months

期刊介绍： Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.