Hybrid Modeling of Sand Production from Petroleum Wellbore

石油井筒出砂的混合建模

• 批准号: 355485-2012
• 负责人: Nouri, Alireza
• 金额: $ 1.46万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572585
• 关键词: Hybrid; Modeling; Sand; Production; Petroleum

This research focuses on developing a practical and reliable tool for predicting sand production from petroleum wellbores. Sanding is a production phenomenon where sand flows with reservoir fluids. Sanding is estimated to cost the industry billions of dollars every year (e.g., through erosion of the production facilities). On the other hand, a small amount of sanding can improve wellbore productivity through removing the wellbore skin created, for example, by formation damage during drilling. There are two types of wellbore completion: (1) sand control in which no sanding is tolerated, and (2) sand management in which small quantities of sanding are allowed or even encouraged. Sand control is costly and reduces productivity. Sand management reduces the completion costs and enhances productivity, but requires reliable sand prediction during completion and wellbore operation design. Currently, there are several models for assessing sand rate, which work based on either continuum or discontinuum mechanics. Continuum-based models are poor at analyzing sanding. The outcome results are spuriously dependent on the numerical mesh design. Discontinuum-based models simulate sanding more accurately, but are computationally demanding and poorly suited for field-scale applications. In this research, linkage of the continuum- and discontinuum-based approaches will be carried out to take advantage of the best aspects of each model. The discontinuum description will be utilized for the near-wellbore area where extensive discontinuum response is expected through the development of cracks and fissures in the rock and where sand is mobilized. Farther away, a continuum description will be utilized as the rock response can be accurately described by continuum mechanics. This approach enables the development of an accurate, reliable model for assessing the sanding rate that can be used in practical applications at the field scale.

本研究的重点是开发一种实用可靠的工具来预测石油井井出砂量。出砂是砂子随储层流体流动的生产现象。据估计，打磨每年会给该行业造成数十亿美元的损失（例如，通过侵蚀生产设施）。另一方面，少量的砂磨可以通过去除例如钻井过程中地层损坏所产生的井眼表皮来提高井眼生产率。 井筒完井有两种类型：（1）不允许出砂的防砂，以及（2）允许甚至鼓励少量出砂的出砂管理。防砂成本高昂，而且会降低生产率。出砂管理可降低完井成本并提高生产率，但在完井和井眼作业设计期间需要可靠的出砂预测。 目前，有几种评估出砂率的模型，它们基于连续介质或不连续介质力学。基于连续体的模型不擅长分析打磨。结果结果虚假地依赖于数值网格设计。基于不连续体的模型可以更准确地模拟打磨，但计算要求较高且不太适合现场规模应用。 在本研究中，将结合基于连续体和不连续体的方法，以利用每个模型的最佳方面。间断面描述将用于近井眼区域，在该区域，预计通过岩石中裂缝和裂隙的发展以及砂子的流动而产生广泛的间断面响应。更远的地方，将利用连续介质描述，因为岩石响应可以通过连续介质力学准确地描述。这种方法能够开发出准确、可靠的模型来评估可在现场规模的实际应用中使用的打磨速率。