Improved Integrity of Primary Cemented Wells

提高原生固井的完整性

• 批准号: 514472-2017
• 负责人: Frigaard, Ian
• 金额: $ 9.36万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=696752
• 关键词: Improved; Integrity; Primary; Cemented; Wells

Canada is a top-10 producer of oil and natural gas globally and this industry is the largest single private sector investor in Canada. Despite alternate energy growth, ~70% of primary and secondary energy consumption comes from oil and natural gas. This project addresses technological aspects of the upstream petroleum industry that impact the environment and/or production efficiency: specifically well cementing. Before hydrocarbons are produced every well undergoes primary cementing. This operation seals the outside of the well, increasing production and preventing subsurface fluids from percolating to surface. Conventional oil recovery rates typically are 20-40%, losing even a few % of productivity is significant. Gas recovery rates are higher, but gas leakage to surface is also more common. Well leakage rates and severity vary worldwide. A common perception is that 10-20% of wellbores leak, which has both health & safety consequences and environmental/ecological impact. Further consequences come at well abandonment: where a poor primary cementing seal necessitates repair/remediation before eventual abandonment. This project targets research in 4 areas related to primary cementing of wells, with a view to improving the process for both production and later abandonment. We study the processes of fluid displacement/mud removal, irregular wellbores and cement hydration. This build on our previous research. New results will be made public via published papers & theses, industry presentations and through engineering software available for design purposes. Over 0.5 million wells have been drilled in Canada, with about 1/3 abandoned, which includes many that are shut-in with pressure at surface. Despite strong evidence that primary cementing is not effective in many cases, it remains a process that is relatively under-researched. Even with the recent industry downturn, over 4800 wells were completed in Canada in 2015. The incentive to improve is ever present.

加拿大是全球十大石油和天然气生产国，该行业是加拿大最大的单一私营部门投资者。尽管替代能源不断增长，但约 70% 的一次和二次能源消耗来自石油和天然气。该项目涉及影响环境和/或生产效率的上游石油工业的技术方面：特别是固井。 在生产碳氢化合物之前，每口井都要进行一次固井。该操作密封了井的外部，增加了产量并防止地下流体渗透到地面。传统的石油采收率通常为 20-40%，即使损失几个% 的生产率也很严重。气体回收率较高，但气体泄漏到地面也更常见。世界各地的井漏率和严重程度各不相同。人们普遍认为 10-20% 的井筒发生泄漏，这会造成健康和安全后果以及环境/生态影响。废弃井会产生进一步的后果：不良的主要固井密封需要在最终废弃之前进行修复/补救。该项目针对与油井初次固井相关的4个领域进行研究，以改进生产和后期废弃的工艺。我们研究流体驱替/泥浆去除、不规则井眼和水泥水化的过程。这是建立在我们之前的研究基础上的。新成果将通过发表的论文和论文、行业演示以及可用于设计目的的工程软件公开。 加拿大已钻探超过 50 万口井，其中约 1/3 被废弃，其中包括许多因地面压力而关闭的井。尽管有强有力的证据表明初次固井在许多情况下并不有效，但它仍然是一个相对缺乏研究的过程。尽管最近行业低迷，2015 年加拿大仍完成了 4800 多口井。改进的动力始终存在。