Annular phase behavior analysis during marine natural gas hydrate reservoir drilling

doi:10.7623/syxb201706011

Acta Petrolei Sinica ›› 2017, Vol. 38 ›› Issue (6): 710-720.DOI: 10.7623/syxb201706011

• Petroleum Engineering • Previous Articles Next Articles

Annular phase behavior analysis during marine natural gas hydrate reservoir drilling

Wei Na¹, Sun Wantong¹, Meng Yingfeng¹, Zhou Shouwei², Fu Qiang², Guo Ping¹, Li Qingping³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. China National Offshore Oil Corporation, Beijing 100010, China;
3. CNOOC Research Institute, Beijing 100027, China

Received:2016-01-06 Revised:2017-03-18 Online:2017-06-25 Published:2017-07-08

海洋天然气水合物藏钻探环空相态特性

魏纳¹, 孙万通¹, 孟英峰¹, 周守为², 付强², 郭平¹, 李清平³

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. 中国海洋石油总公司北京 100010;
3. 中海油研究总院北京 100027

通讯作者: 孟英峰,男,1954年8月生,1977年获西南石油学院学士学位,2002年获西南石油学院博士学位,现为西南石油大学教授,主要从事控压钻井、欠平衡与气体钻井等方面研究。Email:2313005271@qq.com
作者简介:魏纳,男,1980年8月生,2003年获西南石油学院学士学位,2011年获西南石油大学博士学位,现为西南石油大学副教授,主要从事海洋天然气水合物绿色钻采技术,控压钻井、欠平衡钻井与气体钻井系列技术,井下流动控制理论及实验评价法等研究。Email:weina8081@163.com
基金资助:
国家重点研发计划（2016YFC0304008）、国家自然科学基金（No.51334003）、油气藏地质及开发工程国家重点实验室开放基金重点项目（PLN1309、PLN1418）资助。

Abstract

Abstract:

During the drilling of marine natural gas hydrate reservoirs, hydrate cuttings are transported to platform by drilling mud. With temperature rising and pressure dropping, hydrate cuttings rise to a certain position for decomposition, which changes the wellbore flow to annular complex vapor-liquid-solid multiphase flow, bringing great risks to safe production under downhole flow. Aiming at these situations, wellbore temperature and pressure models, dynamic hydrate mass transfer and decomposition model and complex annular multiphase flow model were established considering the coupling effect and influence of wellbore temperature and pressure with hydrate decomposition. Through model solution, numerical simulation was used to analyze the change laws of wellbore temperature, annular pressure and hydrate decomposition under different drilling conditions. The results show that with the increase in drilling fluid displacement, the temperature of cyclical drilling fluid becomes higher at the bottom of wellbore, and that of drilling fluid returned at annular wellhead will decline, leading to the start position of decomposition downwards. Moreover, in case of increasing the drilling fluid density, the annular pressure will be raised, leading to the start position of decomposition upwards. As the drilling fluid inlet temperature rises, the wellbore temperature will be higher, leading to the start position of decomposition downwards. When the penetration rate is increased, the start position of decomposition keeps unchanged.

Key words: marine natural gas hydrate, phase behavior, marine drilling, complex multiphase flow, wellbore temperature, dynamic decomposition

摘要：

海洋天然气水合物藏钻探过程中，水合物钻屑随钻井液向上返出，随着温度升高、压力降低，水合物钻屑上升至一定位置开始分解，使井筒流动变为环空复杂气液固多相流，这对井下流动安全产生严重威胁。考虑井筒温度、压力与水合物分解的耦合作用与影响，建立了海洋天然气水合物钻井过程中井筒温度模型、井筒压力模型、水合物动态传质分解模型和复杂环空多相流模型。通过模型求解，数值分析了井筒温度、环空压力和水合物分解在不同钻井工况下的变化规律。结果表明：增大钻井液排量，井筒中井底处循环钻井液温度升高，环空中井口处返出钻井液温度降低，分解起始位置下移；增大钻井液密度，环空压力升高，分解起始位置上移；增大钻井液入口温度，井筒温度升高，分解起始位置下移；增大机械钻速，分解起始位置不变。

关键词: 海洋天然气水合物, 相态特性, 海洋钻井, 复杂多相流, 井筒温度, 动态分解

CLC Number:

TE28

Wei Na, Sun Wantong, Meng Yingfeng, Zhou Shouwei, Fu Qiang, Guo Ping, Li Qingping. Annular phase behavior analysis during marine natural gas hydrate reservoir drilling[J]. Acta Petrolei Sinica, 2017, 38(6): 710-720.

魏纳, 孙万通, 孟英峰, 周守为, 付强, 郭平, 李清平. 海洋天然气水合物藏钻探环空相态特性[J]. 石油学报, 2017, 38(6): 710-720.

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Annular phase behavior analysis during marine natural gas hydrate reservoir drilling

海洋天然气水合物藏钻探环空相态特性

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