深水气井测试过程中水合物相态曲线的研究与应用

任冠龙; 张崇; 董钊; 孟文波; 吴江

doi:10.3969/j.issn.1001-5620.2018.04.022

深水气井测试过程中水合物相态曲线的研究与应用

doi: 10.3969/j.issn.1001-5620.2018.04.022

中海石油(中国)有限公司湛江分公司, 广东湛江 524057

基金项目:

“十三五”中国海洋石油集团公司重大专项“深水测试关键技术研究”（CNOOC-KJ135ZDXM05LTDZJ02）。

详细信息

作者简介:
任冠龙,工程师,1988年生,现在主要从事钻完井液及储层保护、深水完井测试工艺方面的研究工作。电话(0759)3912453;E-mail:rengl4@cnooc.com.cn。

中图分类号: TE258
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出版历程
- 收稿日期: 2018-01-25
- 刊出日期: 2018-07-30

Study and Application of Phase Curve of Hydrates in Deep Water Gas Well Testing

CNOOC Zhanjiang Branch Company, Zhanjiang, Guangdong 524057

摘要

摘要: 针对深水气井测试过程中井筒温度场的变化带来水合物生成的巨大风险，易导致测试管柱堵塞、环空出现较大的带压值等严重问题，对水合物生成相态曲线在深水气井测试过程中的多方面应用进行了研究。首先在深水气井测试井筒温度场精确预测的基础上，结合水合物相态曲线，定量预测了测试期间管柱内水合物的生成区域，计算得出了测试管柱上的化学药剂注入阀的下入深度，并设计确定了测试期间井筒及地面油嘴处水合物抑制剂的注入量，形成了深水气井测试水合物相态曲线应用方法。该方法在南海深水某气井进行了综合应用，计算得出该井测试期间化学药剂注入阀下入深度为2 450 m，井筒及地面油嘴处水合物抑制剂注入分别为甲醇和（3%～5%）乙二醇，综合应用测试作业工作制度，测试期间井筒无水合物生成，地面油嘴处水合物生成注入抑制剂后压力下降约13.6%，保证了现场测试作业的成功实施，可为其他深水气田测试过程中天然气水合物的防治提供借鉴。
- 深水 /
- 测试 /
- 水合物相态曲线 /
- 生成区域 /
- 抑制剂注入
Abstract: In deep water gas well testing, changes in the temperature field of the wellbore usually result in a huge risk-the formation of hydrates. The hydrate generated will cause test pipes to block, and the annular space to have high pressure. Study has been conducted on the application of the phase curve of hydrate generation in deep water gas well testing. Based on an accurate prediction of the wellbore temperature field in deep water gas well, the area inside the test string in which hydrate will be generated during well testing is quantitatively predicted using the phase curve of hydrate, the depth at which the chemical injection valve is run on the test string is calculated, and the amount of hydrate inhibitor injected in wellbore and at the surface (choke) during testing is determined. All these together form the method of using the phase curve of hydrate in deep water well testing. This method has been used on a deep water gas well in South China Sea. The depth at which the chemical injection valve was run was calculated to be 2,450 m. Two hydrate inhibitors, methanol and glycol (3%-5%), were injected into the wellbore and at the choke on the surface respectively. Well testing was done in accordance with the standard work system, no hydrate had ever occurred in the wellbore during testing. Hydrate was produced at the choke, and after injecting hydrate inhibitor, the pressure was reduced by 13.6%, ensuring the success of the well testing operations. The operation procedure can be used for reference in controlling the formation of gas hydrate during well testing in deep water gas fields.
- Deep water /
- Well testing /
- Phase curve of hydrate /
- Generation area /
- Injection of inhibitor

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参考文献(13)

[1]	白玉湖,李清平,周建良,等. 天然气水合物对深水钻采的潜在风险及对应性措施[J]. 石油钻探技术, 2009,37(3):17-21. BAI Yuhu,LI Qingping,ZHOU Jianliang,et al.The potential risk of gas hydrate to deepwater drilling and production and the corresponding strategy[J].Petroleum Drilling Techniques,2009,37(3):17-21.
[2]	BOTREL T.Hydrates prevention and removal in ultradeepwater drilling systems[C].paper OTC-12962-MS presented at the offshore technology conference, Houston,Texas,USA.New York:SPE,2001.
[3]	王跃曾,唐海雄,陈奉友. 深水高产气井测试实践与工艺分析[J]. 石油天然气学报,2009,31(5):149-151. WANG Yuezeng,TANG Haixiong,CHEN Fengyou. Test practice and process analysis of deep water high production gas well[J]. Journal of Petroleum and Natural Gas,2009,31(5):149-151.
[4]	靳书凯,张崇,孟文波,等. 陵水17-2深水气田钻完井天然气水合物生成风险及预防措施[J]. 中国海上油气,2015,27(4):93-101. JIN Shukai,ZHANG Chong,MENG Wenbo,et al.Gas hydrate risk and preventative measures for drilling and completion operation in LS17-2 deep water gas field[J]. China of Shore Oil and Gas,2015,27(4):93-101.
[5]	董钊,余意,任冠龙,等. 南海超深水浅层低温气井测试温度场干预[J]. 石油钻采工艺,2013,38(5):661-666. DONG Zhao,YU Yi,REN Guanlong, et al.Intervention with the temperature field of shallow and low-temperature gas wells in super-deep south china sea[J].Oil Drilling & Production Technology,2013,38(5):661-666.
[6]	任冠龙,张崇,董钊,等. 海上气井测试液控温性能调整方法[J]. 钻井液与完井液,2016,33(4):117-121. REN Guanlong,ZHANG Chong,DONG Zhao,et al.Temperature control capability of test fluid used in offshore operations[J].Drilling Fluid & Completion Fluid, 2016,33(4):117-121.
[7]	张崇,任冠龙,董钊,等. 深水气井测试井筒温度场预测模型的建立及应用[J]. 中国海上油气,2016,28(5):78-83. ZHANG Chong,REN Guanlong,DONG Zhao,et al. Establishment and application of a wellbore temperature field prediction model for deep water gas well testing[J]. China Off Shore Oil and Gas,2016,28(5):78-83.
[8]	王志远,孙宝江,程海清,等. 深水钻井井筒中天然气水合物生成区域预测[J]. 石油勘探与开发,2008, 35(6):731-735. WANG Zhiyuan,SUN Baojiang,CHENG Haiqing, et al. Prediction of gas hydrate formation region in the wellbore of deepwater drilling[J].Petroleum Exploration and Development,2008,35(6):731-735.
[9]	张亮,张崇,黄海东,等. 深水钻完井天然气水合物风险及预防措施[J]. 石油勘探与开发,2014,41(6):755-761. ZHANG Liang,ZHANG Chong,HUANG Haidong, et al.Gas hydrate risks and prevention for deep water drilling and completion[J].Petroleum Exploration and Development, 2014,41(6):755-761.
[10]	关昌伦,叶学礼. 天然气水合物抑制剂甲醇注入量的计算[J]. 天然气与石油,1993,11(4):8-12. GUAN Changlun,YE Xueli.Calculation of the amount of methanol injection for gas hydrate inhibitors[J].Natural Gas And Petroleum,1993,11(4):8-12.
[11]	PAUL H JAVORA,RICK PEARCY,XIAO LAN WANG,et al.A decade of experience0-the water-based thermal insulating packer fluid[R]. SPE 116769,2008.
[12]	安晓星. 节流对管内天然气水合物生成影响研究[D]. 大庆:东北石油大学,2016. AN Xiaoxing. Influencing research of throttling process on natural gas hydrate formation[D].Daqing:Northeast Petroleum University,2016
[13]	刘鸿文,刘德平. 井下油嘴节流机理研究及应用[J]. 天然气工业,1990,10(5):57-62. LIU Hongwen,LIU Deping.Throttling mechanics of downhole choke and its application[J].Natural Gas Industry,1990,10(5):57-62.