摘要
国内部分稠油油田长期注水造成管柱存在完整性问题,目前主要使用的N80、J55碳钢材质油管腐蚀后剩余强度难以满足需要,管柱穿孔、断裂时有发生。为了确定注采井管柱更换时机,基于CO_(2)腐蚀预测与O_(2)腐蚀预测模型,建立了注采井油套管腐蚀预测方法,选取渤海某油田注采井验证了计算方法的适用性与可靠性;参考API 5C3,建立了管柱考虑腐蚀的强度计算方法,在此基础上得到油套管极限寿命预测方法;最后分别对渤海区域的实例采井开展了实例应用,并提出了管控建议。研究结果显示:注水井腐蚀预测结果试验数据平均误差为5.27%,采油井腐蚀预测结果与实测数据平均误差为11.37%,具备较好的适用性;同时确定了实例注水井安全服役时长和溶解氧质量分数安全控制值。研究成果有效指导了稠油水驱井换管柱时机、注水水质合理控制,可为“老井延寿”、注采井安全高效生产提供理论支撑。
Long-term water injection in some heavy oil fields in China,has caused integrity issues in the pipe strings.The residual strength of existing N80 and J55 carbon steel tubing after corrosion fails to meet the requirements,and piercing and breaking of the string occur from time to time.In order to determine the timing of replacing the strings in injection and production wells,based on the CO_(2)and O_(2)corrosion prediction models,a prediction method for corrosion of tubing and casing in injection and production wells was established.Then,the injection and production wells in an oilfield of the Bohai Sea were selected to verify the applicability and reliability of the calculation method.Referring to API 5C3,a string strength calculation method considering corrosion was established.Thus,a method for predicting the ultimate life of tubing and casing was obtained.Finally,these methods were applied in injection and production wells of the Bohai Sea area respectively,and some safety control suggestions were proposed.The results show that the average errors between corrosion prediction results and test data of injection and production wells are 5.27%and 11.37%respectively,suggesting a satisfactory applicability.The safe service time of injection wells and dissolved oxygen concentration safety control values are determined.The research results effectively guide the timing of replacing string in water flooding heavy oil wells and reasonable control of injection water quality,and provide theoretical support for extending the service life of old wells and ensuring safe and efficient operation of injection and production wells.
作者
刘国振
崔宇
丁鹏飞
张智
杨昆
Liu Guozhen;Cui Yu;Ding Pengfei;Zhang Zhi;Yang Kun(Tianjin Branch of CNOOC(China)Co.,Ltd.;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University;Gathering&Transportation Engineering Technology Research Institute,PetroChina Southwest Oil&Gas Field Company)
出处
《石油机械》
北大核心
2024年第2期130-140,共11页
China Petroleum Machinery
基金
国家自然科学基金项目“深层页岩气长位移水平井套管完整性研究”(52074234)
四川省青年科技创新研究团队专项计划“油气井建井安全四川省青年科技创新研究团队”(2020JDTD0016)
油气藏地质及开发工程国家重点实验室2019年开放基金课题“国家重点实验室大型科研仪器设备维护、升级、开放共享管理研究”(PLN201925)。
关键词
稠油水驱井
注采管柱
腐蚀
寿命预测
安全管控
heavy oil injection well
injection-production string
corrosion
life prediction
safety control
