Mechanical properties of a new type of expandable surface conductor in deepwater oil and gas wells

doi:10.7623/syxb2019S2011

Acta Petrolei Sinica ›› 2019, Vol. 40 ›› Issue (S2): 116-122.DOI: 10.7623/syxb2019S2011

• Petroleum Engineering • Previous Articles Next Articles

Mechanical properties of a new type of expandable surface conductor in deepwater oil and gas wells

Yang Jin¹, Huang Xin², Yang Yuxiang¹, Hu Zhiqiang¹, Song Yu¹, Liu Hexing³, Xu Dongsheng¹, Cai Rao³, Li Lei¹

1. College of Safety and Ocean Engineering, China University of Petroleum, Beijing 102249, China;
2. China National Offshore Oil Corporation, Beijing 100010, China;
3. Zhanjiang Branch, CNOOC China Limited, Guangdong Zhanjiang 524057, China

Received:2019-10-08 Revised:2019-12-05 Online:2019-12-25 Published:2020-04-24

深水油气井新型膨胀导管力学特性

杨进¹, 黄鑫², 杨宇翔¹, 胡志强¹, 宋宇¹, 刘和兴³, 徐东升¹, 蔡饶³, 李磊¹

1. 中国石油大学(北京)安全与海洋工程学院北京 102249;
2. 中国海洋石油集团有限公司北京 100010;
3. 中海石油(中国)有限公司湛江分公司广东湛江 524057

通讯作者: 胡志强,男,1990年12月生,2013年获重庆科技学院学士学位,2019年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司石油工程技术研究院博士后,主要从事海洋油气钻完井工艺和井筒完整性等方向的研究工作。Email:huzhiq.sripe@sinopec.com
作者简介:杨进,男,1966年3月生,1989年获石油大学(华东)学士学位,2004年获中国矿业大学(北京)博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事石油工程和海洋工程领域的教学和科研工作。Email:yjin@cup.edu.cn
基金资助:
国家自然科学基金项目"海洋深水浅层钻井关键技术基础理论研究"（No.51434009）、国家自然科学基金创新研究群体项目"复杂油气井钻井与完井基础研究"（No.51221003）、国家自然科学基金项目"深水油气井导管全寿命周期承载力演化机理研究"（No.51774301）、国家科技重大专项"海外重点油气田开发钻采关键技术"（2017ZX05032-004-003）和中国海洋石油集团有限公司重大项目"深水高温高压科探井井筒完整性保障研究"资助。

Abstract

Abstract:

The jetting method is widely used to install the surface conductor within the industry. However, if the surface conductor cannot provide sufficient bearing capacity, it may cause huge losses such as non-stable wellhead and failure in well construction. A new type of expandable casing technology is adopted to improve the bearing capacity of surface conductor. This technology can effectively increase the external surface area of surface conductor to strengthen its bearing capacity, and reduce the risk of wellhead instability. It has proved to be an efficient, economical and safe method. The study first evaluates and selects the delayed expandable material in the presence of water; An experiment-based test is performed on the volume change rate of expandable material under different conditions of pressure loading, temperature and material ratio. According to the changing law of the ultimate bearing capacity of surface conductor, this paper analyzes the mechanical behavior characteristics of the expandable surface conductor during the stage of delayed expansion caused by water. The volume expansion coefficient of the material is obtained through the linear regression of experimental data. The calculation model has been established for the ultimate bearing capacity of the expandable surface conductor as considering the volume expansion effect, and experiments of field application have also been performed. The experimental results show that the expansion rate of expandable material decreases slightly with the decrease of temperature, decreases slowly with the increase of confining pressure, and the initial expansion moment can be controlled by technical means. When the filling ratio of cross-linking agent is less than 25 % , the expandable characteristic curve of the material can be significantly divided into the water resistance phase and the expansion phase. The application practice shows that the theoretical predictions are consistent with the actual situation. Using the new type of expandable surface conductor, the surface area of surface conductor can be increased by over 20 % and the bearing capacity by more than 30 % . The expandable surface conductor can meet the requirements of field construction, reduce the setting depth and number of surface conductor, and can significantly increase the bearing capacity of underwater wellheads, thus providing technical support for increasing the efficiency of deepwater drilling while reducing costs.

Key words: deepwater oil and gas well, surface conductor, expandable material, bearing capacity of wellhead, jetting drilling, mechanical property

摘要：

喷射法下入表层导管在行业内已经成为一种广受欢迎的导管安装方式，若导管承载能力不足，可能造成井口失稳、建井失败等巨大损失。为提高表层导管的承载能力，采用了新型可膨胀导管技术，此技术能有效增大导管外表面积，加强导管承载力，降低井口失稳风险，是一种既经济又安全的高效方法。首先对遇水延迟膨胀材料进行了评价和优选，通过实验测试了不同温度和压载情况下膨胀材料随时间的体积变化率。根据表层导管极限承载力变化规律，分析了膨胀导管在吸水延迟膨胀阶段的力学行为特征，利用实验数据线性回归得到了材料体积膨胀系数，建立了涵盖体积膨胀效应的膨胀导管极限承载力计算模型，并进行现场应用实验。实验结果表明：膨胀材料的膨胀率随温度的下降略有减小，随围压的增大缓慢降低，起始膨胀时刻可通过技术手段进行控制。试验井实际应用结果表明：理论预测结果符合实际情况，新型膨胀表层导管可使导管表面积增加20 % 以上，承载力提升30 % 以上。膨胀导管既能满足现场施工要求，减少表层导管下入深度和使用数量，又能显著提升水下井口承载力，可为深水钻井降本增效提供技术支撑。

关键词: 深水油气井, 表层导管, 膨胀材料, 井口承载力, 喷射钻井, 力学特性

CLC Number:

TE52

Yang Jin, Huang Xin, Yang Yuxiang, Hu Zhiqiang, Song Yu, Liu Hexing, Xu Dongsheng, Cai Rao, Li Lei. Mechanical properties of a new type of expandable surface conductor in deepwater oil and gas wells[J]. Acta Petrolei Sinica, 2019, 40(S2): 116-122.

杨进, 黄鑫, 杨宇翔, 胡志强, 宋宇, 刘和兴, 徐东升, 蔡饶, 李磊. 深水油气井新型膨胀导管力学特性[J]. 石油学报, 2019, 40(S2): 116-122.

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Mechanical properties of a new type of expandable surface conductor in deepwater oil and gas wells

深水油气井新型膨胀导管力学特性

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