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深水钻井管柱力学与设计控制技术研究新进展
高德利, 王宴滨
中国石油大学石油工程教育部重点实验室,北京 102249
Progress in tubular mechanics and design control techniques for deep-water drilling
GAO Deli, WANG Yanbin
Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

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摘要  深水钻井作业主要包括导管喷射安装、表层套管井段钻井、水下防喷器组和深水钻井隔水管安装及后续钻井等4 个主要作业环节,涉及导管、钻井隔水管、送入管柱等3 类管柱系统。与陆地及浅水近海钻井不同,由于深水钻井工况的独特性,管柱在作业过程中产生复杂的力学行为,严重影响深水钻井的安全高效作业。因此,开展深水钻井管柱力学与设计控制技术研究,对于推动深水钻井科技进步具有重要意义。 深水导管喷射安装技术是适应深水钻井的特殊要求而发展起来的一种浅层作业技术,也是深水钻井作业程序的第一步。作业过程涉及导管和送入管柱2 类管柱系统,主要目的在于建立安全稳定的水下井口,为后续的钻井作业奠定基础。例如送入管柱的力学行为分析与优化设计研究、水下井口的管土相互作用与导管承载能力研究等,对实现水下井口安全稳定的目标具有重要意义。本文从工程应用与技术研发2 个方面,对涉及其中的送入管柱强度设计与校核、导管喷射安装工艺和导管承载能力等3 个方面的研究进展进行了综述与展望。认为深水导管喷射安装的未来研究将侧重于极限工况下导管的入泥深度与承载力计算、喷射钻进参数优化、导管喷射安装风险评估与可靠性预测,以及深水导管喷射安装模拟实验等内容。 深水钻井隔水管是连接浮式钻井平台与水下井口的重要设备,可提供钻井液循环通道、支持辅助管线、引导钻具、下放与回收防喷器组等。深水钻井隔水管在整个钻井作业过程中涉及安装、正常钻进、回收与紧急撤离等作业过程。由于波流联合作用力的动态效应,深水钻井隔水管在服役期间会产生轴向拉伸、横向弯曲、耦合振动等一系列复杂力学行为,给深水钻井安全作业带来巨大挑战。因此,对深水钻井隔水管力学行为进行研究,确保其安全可靠性,是深水钻井研究的关键问题之一。本文着眼于深水钻井隔水管的顶张力控制、纵横弯曲变形、横向振动特性、纵向振动特性、耦合振动特性及涡激振动特性等主要力学问题,从载荷计算、控制方程、边界条件及求解方法等方面入手,总结了深水钻井隔水管系统在力学与设计控制技术方面取得的新进展,对目前研究中仍然存在的问题进行了剖析和探讨。研究认为在以后的工作中,应在深水钻井隔水管安装作业窗口分析预测、隔水管涡激振动响应与抑制、隔水管疲劳寿命计算与评估,以及隔水管力学行为模拟实验等方面加强研究。 在深水井筒整个寿命期间,最大限度地使井筒中地层流体处于有效控制的安全运行状态,防止浅层气和浅水流入侵,提高固井质量...
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关键词 : 深水钻井; 管柱力学; 设计控制技术; 深水导管; 海洋钻井隔水管
Abstract

  Generally, deep-water drilling procedures include four main steps: jetting installation operations for the deep-water conductor, drilling operations for surface casings under the mudline, installation operations of marine drilling risers and blowout preventers (BOP), and subsequent drilling operations. These involve three kinds of tubular strings; deep-water conductor, marine drilling riser and landing string. The tubular mechanics in deep-water drilling are complex and different from those in onshore and shallow offshore drilling and they have a strong impact on the safety and efficiency of drilling operations. Therefore, it is of great significance to study tubular mechanics and design control techniques to improve deep-water drilling performance and efficiency. The conductor jetting operations are used to meet the special requirements of deep-water drilling. It is the first step of well construction in deep-water drilling aimed to establish a stable subsea wellhead for the subsequent drilling operations. The deep-water conductor and landing string are indispensable during conductor jetting operations. In order to maintain the subsea wellhead stability, it is necessary to study the landing string mechanics and the bearing capacity of deep-water conductors by analyzing the subsea soil-pipe interaction. This can help realize the engineering goals of the conductor jetting operation. In this paper, progress in the design strength and checking of the landing string, the jetting operation process and the bearing capacity of deep-water conductors are reviewed and predicted from two aspects: technical research & development and engineering applications. Further studies of conductor jetting operations should be focused on the driving depth and the bearing capacity of deep-water conductors under some extreme working conditions, parameter optimization, risk assessment and reliability prediction, and simulation experiments. The marine drilling riser is the important connection between the subsea wellhead and the floating drilling platform. It plays an irreplaceable role in providing the channel for the drilling fluid, supporting auxiliary pipelines, guiding the drilling tools, installing and retrieving the BOP stack, etc. The drilling riser is involved in three main operation processes during deep-water drilling: installation, normal drilling and emergency disconnection and evacuation. Due to the dynamic effects of wave and current forces, the riser shows complex mechanical behavior, such as axial tension, lateral bending and coupled vibrations, which bring huge challenges for safe operations. Thus, riser mechanics is one of the key issues considered in deep-water drilling. Some mechanical characteristics to drilling risers, such as top tension control, lateral deformation and dynamic characteristics, longitudinal dynamic characteristics, coupled dynamic characteristics and vortex-induced vibration (VIV) are illustrated in this paper. Some problems still exist in loading calculations, control equations and boundary conditions. Methods for deriving solutions are also presented. In the future, research into the analysis and prediction of marine drilling riser installation windows, VIV response and prevention measures, fatigue life evaluation and simulation experiments should be undertaken to improve marine riser design. To ensure oil and gas well integrity in deep-water conditions, it is necessary to do more research to prevent shallow flow invasion and casing failure, to improve the cementing quality. In this paper, research progress in the prediction and prevention of damage to deep-water wells is reviewed from the following aspects: temperature distribution, annular pressure and stress distribution. Issues include unsteady heat transfer from the formation, circulating temperature distribution of the well annulus, additional load caused by heating expansion of fluids in the sealed annulus and its precautionary approaches, annulus pressures in multilayer casing strings and thermal-mechanical coupled response of the casing-cement-formation. Future research should be focused on the corresponding design optimization methods for well structures and casing strings, well integrity risk assessment and control techniques with consideration of the special processes and working conditions in deep-water drilling. It is necessary to carry out tubular mechanics simulation experiments to obtain valid data for improving research into tubular mechanics and design control techniques in deep-water drilling. A deep-water tubular mechanics experimental facility has been built by China University of Petroleum, Beijing. It is introduced in detail by describing the structural compositions, operating methods, technical parameters and main functions, etc. Simultaneously, some marine drilling riser mechanics experiments and fatigue life testing are presented in this paper. This review is intended to guide future research on tubular mechanics and design control techniques for deep-water drilling.

Key words: deep-water drilling ; tubular mechanics ; design control techniques ; deep-water conductor ; marine drilling riser
收稿日期: 2018-05-30     
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高德利,王宴滨. 深水钻井管柱力学与设计控制技术研究新进展[J]. 石油科学通报, 2016, 1(1): 61-80. GAO Deli, WANG Yanbin. Progress in tubular mechanics and design control techniques for deep-water drilling. 石油科学通报, 2016, 1(1): 61-80.
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