本文關鍵詞： 深水鉆井 控壓鉆井 雙梯度鉆井 關鍵參數(shù) 模擬計算　出處：《西南石油大學》2017年碩士論文　論文類型：學位論文

【摘要】：與陸地鉆井相比,利用傳統(tǒng)鉆井方式進行深水鉆井作業(yè)面臨的困難很多:可用深水鉆機少、狹小的壓力窗口、氣侵現(xiàn)象等。雙梯度控壓鉆井技術是針對上述深水鉆井問題提出的一種新型鉆井技術解決方案。CML雙梯度鉆井作為該鉆井技術解決方案的一個重要分支,其關鍵作業(yè)參數(shù)包括井筒壓力、起下鉆波動壓力、泵排量、環(huán)空鉆井液液位高度等,這些關鍵作業(yè)參數(shù)是影響施工安全和作業(yè)成本的主要因素,目前國內(nèi)缺乏相應的理論計算模型。基于此,本文以雙梯度鉆井中的新型雙梯度鉆井—CML雙梯度鉆井的關鍵參數(shù)模擬與計算為主要研究內(nèi)容。本文首先通過文獻調(diào)研國內(nèi)外雙梯度鉆井控壓鉆井技術發(fā)展狀況,通過調(diào)研表明,國內(nèi)還未開展針對CML雙梯度鉆井的研究。緊接著,本文研究了 CML雙梯度控壓鉆井技術工藝原理、工藝流程以及配套設備,并探討了該技術與其他雙梯度鉆井鉆井的不同之處與該技術的適用環(huán)境;最后通過理論推導研究了不同工況下雙梯度鉆井關鍵參數(shù)的模擬計算方法:鉆進時環(huán)空壓降及環(huán)空鉆井液液位高度設計方法;起下鉆時波動壓力計算;氣侵時,利用AUSMV模型計算兩相流模型下的泵排量、環(huán)空壓耗、泵壓、環(huán)空壓力、氣液相比例、溢流量等參數(shù)。模擬計算結(jié)果表明:采用CML雙梯度鉆井技術可以利用相同密度的鉆井液來應對不同工況下的井下壓力變化,哪怕在氣侵工況,也無需加重鉆井液。在理論研究的基礎上,基于VS2013和C#語言進行軟件的編寫,開發(fā)出了雙梯度鉆井計算分析軟件,使用本軟件可以根據(jù)井基本數(shù)據(jù),進行不同工況下CML雙梯度鉆井的模擬與計算,將計算結(jié)果將用于指導CML雙梯度鉆井關鍵參數(shù)設計與優(yōu)選,為CML雙梯度控壓鉆井技術工程設計及施工提供參考,同時有助于雙梯度控壓鉆井技術的安全應用及推廣。
[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.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE52

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