增压电缆和FTWD环境下的渗透率、压缩性和压力预测

Q4 Energy
Xiaofei Qin, Yongren Feng, Lejun Wu, Zhongjian Tan, Yanmin Zhou, W. Chin
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引用次数: 0

摘要

在传统的电缆和LWD/MWD地层测试中,岩石和流体性质的井下预测是基于简化的达西流动模型,但只是为了数学上的方便。这要求初始压力恒定,整个储层均匀。这一限制排除了在过平衡钻井中的常见应用,因此增压或近井侵入效应(与测量压力的地面压力迅速下降有关)完全被忽略。这种20世纪90年代的数学模型通常被使用,尽管有记录的现场结果显示过平衡高达2,000 psi。不正确的建模会产生不正确的预测,从而导致错误的地层评价结果和经济分析。在这里,常规接受的模型(由上一位作者在20多年前开发)被严格扩展,以允许一般增压和欠平衡钻井效果。解释了公式和算法,并提供了详细的压力示例,显示了早期算法与新算法之间的本质区别。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Permeability, Compressibility and Pressure Prediction in Supercharged Wireline and FTWD Environments
In conventional wireline and LWD/MWD formation testing, downhole predictions for rock and fluid properties are based on simplified Darcy flow models, but only for mathematical expediency. These require initially constant pressures that are uniform throughout the reservoir. This limitation precludes common applications in overbalanced drilling, so that supercharge or near-well invasion effects - associated with rapidly decreasing pressures at the sandface where pressures are measured - are completely ignored. Such 1990s math models are commonly used despite documented field results for overbalances as high as 2,000 psi. Incorrect modeling can produce incorrect predictions, leading to misleading formation evaluation results and economic analyses. Here, the conventionally accepted model (developed by the last author over two decades ago) is rigorously extended to allow general supercharge and also underbalanced drilling effects. The formulation and algorithm are explained and detailed pressure examples are offered showing essential differences between earlier and newer algorithms.
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来源期刊
Journal of Nuclear Energy Science and Power Generation Technology
Journal of Nuclear Energy Science and Power Generation Technology Energy-Energy Engineering and Power Technology
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