Development of a Predictive Tool For Estimating Well Performance In Horizontal Shale Gas Wells In the Barnett Shale, North Texas, USA
Development of a Predictive Tool For Estimating Well Performance In Horizontal Shale Gas Wells In the Barnett Shale, North Texas, USA
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开发用于评估美国德克萨斯州北部巴尼特页岩水平页岩气井井动态的预测工具
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发表时间：
2009
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通讯作者：
S. Jackson
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作者：
R. W. Spears;S. Jackson
近年来，通过使用水平开发井，“非常规”页岩气储层的生产受到越来越多的关注和经济可行性。人们发现，最大限度地提高此类井的水平渗透率是解锁页岩气储层并以经济速度开采的最大关键之一。目前，德克萨斯州达拉斯-沃斯堡地区及其周边地区正在利用水平井应用开发世界级的页岩气储量。这里提出了一种多组件方法，利用来自针对巴梅特页岩钻探的多个垂直先导钻孔的裸眼测井数据，得出可靠且准确的页岩气水平井性能预测。从根本上来说，这种方法建立在四个关键要素的基础上：彻底的岩性概率体积估计、总孔隙度计算、使用改进的双水饱和度模型估计游离气的存在以及干酪根和该层段总有机碳（TOC）的预测。根据对裸眼井测井的初步评估，净干酪根英尺、TOC-英尺和吸附气英尺均已被确定为有意义的页岩“质量”衡量标准，可作为准确预测水平井最终采收气量 (EUR) 的工具。这些因素已被加权为随后从每个导向钻出的水平生产孔的钻出横向长度的函数。根据水平长度改变先导井计算的值是该评估技术的一个关键方面，并且发现这些参数的权重与研究井基于递减曲线的 EUR 体积相关。该净产品是使用在垂直导孔中获取的标准裸眼测井数据来可视化和量化现有五口巴梅特页岩水平井的井动态的可靠指标。
Production from "unconventional" shale gas reservoirs has seen increased attention and economic viability in recent years through the use of horizontal development wells. Maximizing horizontal permeability in such wells has been found to be one of the largest keys to unlocking shale gas reservoirs and producing them at economic rates. Currently, a world-class shale gas accumulation is being developed in and around the Dallas-Fort Worth, Texas, area using horizontal well applications. A multi-component approach to derive reliable and accurate predictions of horizontal shale gas well performance is presented here, using open hole well log data from several vertical pilot boreholes that have been drilled targeting the Bamett Shale. Fundamentally, this approach is founded upon four key elements: a thorough probabilistic volume estimation of lithology, calculation of total porosity, estimation of free gas present using a modified dual water saturation model and prediction of kerogen and total-organic-carbon (TOC) of the interval. From the primary evaluation from open hole logs, net kerogen-feet, TOC-ft and adsorbed gas-feet have all been identified as meaningful measures of shale "quality" that are useful as a vehicle to obtain accurate predictions of horizontal well ultimate recovery gas volumes (EUR). These factors have been weighted as a function of drilled lateral length for the horizontal production hole that has been subsequently drilled from each pilot. Varying the values calculated at the pilot well according to horizontal length is a key aspect of this evaluation technique and the weighting of these parameters found to correlate to decline-curve based EUR volumes for the study wells. The net product has been a reliable indicator for visualizing and quantifying well performance in five existing Bamett Shale horizontal wells, using standard open hole well log data acquired in the vertical pilot holes.