CO2注采井油管柱服役安全状态评价方法

doi:10.7623/syxb202008008

石油学报 ›› 2020, Vol. 41 ›› Issue (8): 991-1000.DOI: 10.7623/syxb202008008

CO₂注采井油管柱服役安全状态评价方法

张智¹, 丁剑¹, 李炎军², 罗鸣², 吴江², 杨昆¹, 刘金铭¹

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 中海石油(中国)有限公司湛江分公司广东湛江 524057

收稿日期:2019-09-18 修回日期:2020-06-06 出版日期:2020-08-25 发布日期:2020-09-01
通讯作者: 张智,男,1976年8月生,1999获西南石油学院学士学位,2005年获西南石油学院博士学位,现为西南石油大学教授、博士生导师,主要从事石油工程教学和科研工作。Email:wisezh@126.com
作者简介:张智,男,1976年8月生,1999获西南石油学院学士学位,2005年获西南石油学院博士学位,现为西南石油大学教授、博士生导师,主要从事石油工程教学和科研工作。Email:wisezh@126.com
基金资助:
高等学校学科创新引智计划（111计划）项目（D18016）、四川省青年科技创新研究团队专项计划项目（2020JDTD0016）、西南石油大学油气藏地质及开发工程国家重点实验室资助项目（PLN201925）、中海石油（中国）有限公司重大科技专项（CNOOC-KJ135ZDXM38ZJ05ZJ）资助。

Safety evaluation method for service state of tubing string in CO₂ injection-production well

Zhang Zhi¹, Ding Jian¹, Li Yanjun², Luo Ming², Wu Jiang², Yang Kun¹, Liu Jinming¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Zhanjiang Branch, CNOOC China Limited, Guangdong Zhanjiang 524057, China

Received:2019-09-18 Revised:2020-06-06 Online:2020-08-25 Published:2020-09-01

摘要/Abstract

摘要：

针对CO₂注采井油管柱因腐蚀失效而频繁更换的问题，研究了适用于CO₂注采井井筒环境的CO₂腐蚀速率预测模型及管柱力学分析方法，分析讨论了CO₂注采井工况、产出液含水率等因素随时间的变化对CO₂注采井油管柱腐蚀速率及承受载荷的影响，结合管柱腐蚀剩余强度计算方法，建立了CO₂注采井油管柱服役安全状态评价方法，并进行了实例计算和比较。结果表明，针对CO₂注采井油管柱腐蚀预测，DW-95模型有较好的适用性，生产阶段为CO₂注采井腐蚀发生主要阶段及安全状态评价的主要对象；管柱安全服役时间与其腐蚀速率及承受载荷呈负相关，且管柱抗压安全服役时间为管柱最小安全服役时间，是安全状态评价的主要依据，以此为标准可确定管柱更换周期，优化CO₂注采井吞吐周期，指导现场安全生产。

关键词: CO₂腐蚀, 剩余强度, 腐蚀预测, 油管柱, CO₂注采井, 安全评价

Abstract:

Aiming at the problem of frequent replacement of the tubing string in CO₂ injection-production well due to corrosion failure, this paper studies a prediction model of CO₂ corrosion rate suitable for the wellbore environment of CO₂ injection-production well and the mechanical analysis method of string, analyzes and discusses the influence of the changes in the condition of CO₂ injection-production well, water content of produced fluid and other factors with time on the corrosion rate and load of tubing string in CO₂ injection-production well, and in combination with the calculation method of the residual strength of the string corrosion, establishes a safety evaluation method for the service state of tubing string in CO₂ injection-production well, as well as conducts example calculation and comparison. The results show that for the corrosion prediction of tubing string in CO₂ injection-production well, the DW-95 model has good applicability. The production stage is the main stage of corrosion in CO₂ injection-production well and the main object of evaluation on safe service state. The safe service time of tubing string is negatively correlated with its corrosion rate and load, and the safe service time is the minimum safe service time for the tubing string, which provides the main basis for the safety evaluation of service state. Applying this as the standard, the replacement cycle of the string can be determined, and the huff and puff period of CO₂ injection-production well can be optimized, thus guiding on-site safety production.

Key words: CO₂ corrosion, residual strength, corrosion prediction, tubing string, CO₂ injection-production well, safety evaluation

中图分类号:

TE983

张智, 丁剑, 李炎军, 罗鸣, 吴江, 杨昆, 刘金铭. CO₂注采井油管柱服役安全状态评价方法[J]. 石油学报, 2020, 41(8): 991-1000.

Zhang Zhi, Ding Jian, Li Yanjun, Luo Ming, Wu Jiang, Yang Kun, Liu Jinming. Safety evaluation method for service state of tubing string in CO₂ injection-production well[J]. Acta Petrolei Sinica, 2020, 41(8): 991-1000.

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CO₂注采井油管柱服役安全状态评价方法

Safety evaluation method for service state of tubing string in CO₂ injection-production well

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