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首页> 外文会议>SPE annual technical conference and exhibition >Using Horizontal Wells to Sequester CO_2 and Enhance Coalbed Methane Recovery: A Simulation Study of Operating Procedures
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Using Horizontal Wells to Sequester CO_2 and Enhance Coalbed Methane Recovery: A Simulation Study of Operating Procedures

机译：利用水平井封存CO_2并提高煤层气采收率：作业程序的模拟研究

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Because of increased concern about anthropogenic carbon dioxide emissions, a pilot project is being implemented in northwest West Virginia to study the technical feasibility of carbon dioxide sequestration in unmineable coal seams. The project consists of four 3000 ft horizontal wellbores forming the exterior of a square with four horizontal wellbores at its center. Methane production occurs from all wellbores until the reservoir is sufficiently depleted, then the central wellbores are converted to carbon dioxide injectors while production continues from the exterior wellbores. In our simulations for this project, injection and production continue until the mole fraction of carbon dioxide in the produced gas reaches 0.1.The design factors studied were the lengths and orientations of the central wells, while the operational factors studied were the pressures in the injection wells. We examined the cases where the injectors are oriented perpendicular to the exterior wellbores and where they are oriented toward the corners. The performance of a pilot project is also compared with that of a pattern in a fully-developed field.For a pilot project, operating parameters that give the longest project life also yield the greatest methane production. On the other hand, for a developed field the main factor controlling methane production is sweep. Although the longest injectors have poor sweep efficiency, short injectors represent little improvement over the performance of intermediate length injectors, but they significantly lower production rates. Injection pressure has only a weak effect on total methane production in a developed field. Higher injection pressuresresult in slightly more methane left in place in unswept areas of the reservoir, but also result in a higher production rate. The sequestration performance for either case is controlled by a combination of sweep efficiency and average pressure in the swept area. The interaction of sweep and reservoir pressure on performance results in a maximum in performance for intermediate length injectors. For low anisotropy the diagonal injectors yield better sequestration performance, but for high anisotropy the perpendicular injectors with unequal lengths perform better. In all cases a long diffusion time constant places an upper limit on injection rates that also yield good performance.
机译：由于对人为二氧化碳排放的关注日益增加，西弗吉尼亚州西北部正在实施一个试点项目，以研究在不可开采的煤层中封存二氧化碳的技术可行性。该项目由四个3000英尺的水平井眼组成，这些井眼形成一个正方形的外部，其中心为四个水平井眼。从所有井筒开始进行甲烷生产，直到储层被充分耗尽，然后将中心井筒转换为二氧化碳注入器，同时从外部井筒继续进行生产。在我们对该项目的模拟中，注入和生产一直持续到产出气中二氧化碳的摩尔分数达到0.1为止。 研究的设计因素是中心井的长度和方向，而研究的操作因素是注入井的压力。我们研究了注入器垂直于外部井筒且注入角朝向井壁的情况。在充分发展的领域中，还将试点项目的性能与模式的性能进行了比较。 对于一个试点项目，提供最长项目寿命的运行参数也可以产生最大的甲烷产量。另一方面，对于发达的油田，控制甲烷生产的主要因素是扫除。尽管最长的喷油器扫掠效率很低，但短的喷油器对中长喷油器的性能影响不大，但生产率却大大降低。在已开发的油田中，注入压力对甲烷的总产量仅有微弱的影响。更高的注射压力 导致在储层未清扫的区域中残留更多的甲烷，但也导致了更高的生产率。两种情况下的隔离性能都由扫掠效率和扫掠区域中的平均压力共同控制。扫掠和储层压力对性能的相互作用导致中等长度喷油器的性能最大化。对于低各向异性，对角注入器产生更好的隔离性能，但是对于高各向异性，长度不等的垂直注入器表现更好。在所有情况下，较长的扩散时间常数都会对注入速率产生上限，这也会产生良好的性能。

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