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首页> 外文会议>SPE Rocky Mountain regional meeting/low permeability reservoirs symposium and exhibition >An Improved Method for Analyzing Complex Declines of Wells Completed in Compartmentalized Meander-Belt Systems
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An Improved Method for Analyzing Complex Declines of Wells Completed in Compartmentalized Meander-Belt Systems

机译：区间曲折带系统中完井复杂度分析的改进方法

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Effective production-decline analysis is crucial to thernsuccessful management of declining oil and gas wells. Fromrnanalysis of declines caused by reservoir conditions, engineersrncan generate valuable information such as reserve estimatesrn(useful for property value appraisal) and production forecastsrn(useful for generating cash-flow forecasts). In short, arnproduction-decline analysis is at the heart of many economicrndecisions about the future of a well or property.rnBecause decline analysis is so important, engineers arernfaced with a significant problem when the conventionalrnmethods of analysis break down. For example, wellsrncompleted in fluvial, meander-belt systems such as thosernfound in the Piceance basin, Colorado often do not follow thernconventional production decline patterns established withrnexponential and hyperbolic equations. Rather, the declinernreflects the complex interaction arising fromrncompartmentalized, point-bar reservoirs that are commingledrnat the wellbore. This paper presents an improved method ofrnanalyzing these complex declines using a numerical simulator.rnCentral to this method is the definition of six differentrnreservoir types, each of which can be subjected to differentrnboundary conditions and hydraulic fracture options (i.e., withrnor without fracture, different fracture orientations, differentrnfracture lengths, etc.). While there are other configurationsrnavailable in nature, these reservoir types form a sufficientrnrepresentation for modeling purposes of therncompartmentalized reservoirs likely to be encountered andrnproduced.rnThe modeling itself is done in two steps. The first step is tornmodel the individual responses of the reservoir types andrnsuperpose the responses in various combinations until a roughrnmatch of actual production history is achieved. This bestmatchrncombination is then used as a starting point for thernsecond step: modeling the complete system allowingrncommingling at the wellbore. Further model runs are madernuntil an acceptable match is found. This match is the basis forrnpredicting future performance.
机译：有效的产量下降分析对于成功管理不断下降的油气井至关重要。通过对水库条件造成的下降的分析，工程师可以生成有价值的信息，例如储量估计值（对物业价值评估有用）和生产预测值（对产生现金流量预测有用）。简而言之，产量下降分析是关于井或财产的未来的许多经济决策的核心。由于下降分析非常重要，因此当常规分析方法崩溃时，工程师面临一个重大问题。例如，在河流，曲折带系统中完成的井，例如在科罗拉多州Piceance盆地发现的井，常常不遵循由指数和双曲线方程建立的常规生产下降模式。相反，下降反映了由井筒中混合的分隔室点状储层引起的复杂相互作用。本文提出了一种使用数值模拟器分析这些复杂下降的改进方法。该方法的核心是定义了六种不同的储层类型，每种储层都可以经受不同的边界条件和水力压裂选择（即，无裂缝，有不同裂缝方向的裂缝） ，不同的断裂长度等）。尽管本质上还有其他可用的配置，但是这些储层类型可以为可能遇到和生产的分区储层的建模提供足够的表示。建模本身分两个步骤完成。第一步是撕裂储层类型的各个响应，并以各种组合叠加响应，直到获得实际生产历史的大致匹配为止。然后将这种最佳匹配组合用作第二步的起点：对整个系统进行建模，以允许在井眼处进行混合。在找到可接受的匹配之前，将进行进一步的模型运行。该匹配是预测未来性能的基础。

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