双梯度钻井关键参数模拟与计算研究

发布时间：2018-02-04 17:25

本文关键词： 深水钻井控压钻井双梯度钻井关键参数模拟计算　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：与陆地钻井相比,利用传统钻井方式进行深水钻井作业面临的困难很多:可用深水钻机少、狭小的压力窗口、气侵现象等。双梯度控压钻井技术是针对上述深水钻井问题提出的一种新型钻井技术解决方案。CML双梯度钻井作为该钻井技术解决方案的一个重要分支,其关键作业参数包括井筒压力、起下钻波动压力、泵排量、环空钻井液液位高度等,这些关键作业参数是影响施工安全和作业成本的主要因素,目前国内缺乏相应的理论计算模型。基于此,本文以双梯度钻井中的新型双梯度钻井—CML双梯度钻井的关键参数模拟与计算为主要研究内容。本文首先通过文献调研国内外双梯度钻井控压钻井技术发展状况,通过调研表明,国内还未开展针对CML双梯度钻井的研究。紧接着,本文研究了 CML双梯度控压钻井技术工艺原理、工艺流程以及配套设备,并探讨了该技术与其他双梯度钻井钻井的不同之处与该技术的适用环境;最后通过理论推导研究了不同工况下双梯度钻井关键参数的模拟计算方法:钻进时环空压降及环空钻井液液位高度设计方法;起下钻时波动压力计算;气侵时,利用AUSMV模型计算两相流模型下的泵排量、环空压耗、泵压、环空压力、气液相比例、溢流量等参数。模拟计算结果表明:采用CML双梯度钻井技术可以利用相同密度的钻井液来应对不同工况下的井下压力变化,哪怕在气侵工况,也无需加重钻井液。在理论研究的基础上,基于VS2013和C#语言进行软件的编写,开发出了双梯度钻井计算分析软件,使用本软件可以根据井基本数据,进行不同工况下CML双梯度钻井的模拟与计算,将计算结果将用于指导CML双梯度钻井关键参数设计与优选,为CML双梯度控压钻井技术工程设计及施工提供参考,同时有助于双梯度控压钻井技术的安全应用及推广。
[Abstract]:Compared with terrestrial drilling, it is difficult to use traditional drilling methods in deep-water drilling: there are fewer deep-water drilling rigs available and narrow pressure windows. Dual gradient controlled pressure drilling is a new drilling technology solution. CML double gradient drilling is an important branch of this drilling technology solution. The key operating parameters include wellbore pressure, drilling fluctuation pressure, pump displacement, drilling fluid level height and so on. These key operating parameters are the main factors that affect the construction safety and operation cost. At present, there is no corresponding theoretical calculation model in our country. This paper focuses on the simulation and calculation of the key parameters of a new type of double-gradient drilling CML double-gradient drilling. Firstly, the development of double-gradient drilling and pressure control drilling technology at home and abroad is studied in this paper. The situation. The investigation shows that there is no research on CML double gradient drilling in China. Then, this paper studies the technology principle, technological process and supporting equipment of CML double gradient controlled pressure drilling. The differences between this technology and other double gradient drilling techniques and the applicable environment of the technology are also discussed. Finally, the simulation calculation method of the key parameters of double-gradient drilling under different working conditions is studied by theoretical derivation: the design method of annular pressure drop and drilling fluid level height during drilling; Calculation of fluctuating pressure when drilling; During gas invasion, the pump displacement, annular pressure consumption, pump pressure, annulus pressure and gas-liquid phase ratio are calculated by AUSMV model. The simulation results show that the drilling fluid of the same density can be used to cope with the downhole pressure change under different operating conditions, even in the gas invasion condition, using CML double gradient drilling technology. On the basis of theoretical research, based on the programming of VS2013 and C # language, a double gradient drilling calculation and analysis software is developed. The software can be used to simulate and calculate the CML double gradient drilling under different working conditions according to the basic well data. The calculation results will be used to guide the design and optimization of the key parameters of CML double gradient drilling. It provides a reference for the engineering design and construction of CML double gradient controlled pressure drilling technology, and is helpful to the safe application and popularization of double gradient controlled pressure drilling technology.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE52

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