本文選題：小井眼 + 環(huán)空壓耗��； 參考：《西安石油大學》2015年碩士論文

【摘要】：由于小井眼井環(huán)空間隙小以及鉆柱高速旋轉的特點,小井眼鉆井與常規(guī)井眼鉆井在水力學上有很大的區(qū)別,其中重要的一點就是小井眼環(huán)空壓耗明顯大于常規(guī)井。鉆柱旋轉、鉆柱偏心等對環(huán)空壓耗有影響的因素在小井眼環(huán)空壓耗計算中不能再忽略,常規(guī)的水力參數(shù)優(yōu)化設計方法也已不能完全適用于小井眼。另外現(xiàn)有的小井眼環(huán)空壓耗計算模型考慮的影響因素不夠全面且預測精度不高,因此急需建立一個精確的小井眼環(huán)空壓耗計算模型及適用于小井眼井的水力參數(shù)優(yōu)化設計模型。本文在系統(tǒng)調研國內外小井眼鉆井水力學資料的基礎上,對小井眼與常規(guī)井水力學差異進行了研究;在常規(guī)井環(huán)空壓耗計算基礎上,推導出了一種新的適用于賓漢、冪律、赫巴等多種流變模式,考慮了鉆柱旋轉、鉆柱偏心、鉆具接頭、井壁粗糙度等因素綜合影響的小井眼環(huán)空壓耗計算模型;分析了不同鉆井液流變模式及各影響因素對環(huán)空壓耗的影響,通過現(xiàn)場實測數(shù)據(jù)的驗證表明文中建立的小井眼環(huán)空壓耗計算模型具有很高的計算精度;針對小井眼井環(huán)空壓耗對鉆井液流變模式選擇的敏感性,建立了一種新的流變參數(shù)計算方法和流變模式優(yōu)選方法;最終完善了小井眼鉆井水力參數(shù)優(yōu)化設計理論,通過對鉆井液流變模式、循環(huán)系統(tǒng)壓耗的計算,噴嘴當量直徑計算等方面的優(yōu)化,建立了小井眼鉆井水力參數(shù)優(yōu)化設計模型并開發(fā)了小井眼鉆井水力參數(shù)優(yōu)化設計軟件。
[Abstract]:Due to the characteristics of small annulus gap and high speed rotation of drill string, there is a great difference between slim-hole drilling and conventional borehole drilling in hydraulics. The important point is that the annulus pressure consumption of slim-hole is obviously higher than that of conventional borehole. The factors affecting annulus pressure loss such as string rotation and eccentricity can not be ignored in the calculation of annulus pressure loss of small borehole, and the conventional optimization design method of hydraulic parameters can not be completely applied to small hole. In addition, the existing calculation model of borehole annulus pressure loss is not comprehensive enough and the prediction accuracy is not high, so it is urgent to establish an accurate calculation model of slim-hole annulus pressure loss and a model of hydraulic parameter optimization design suitable for small borehole. On the basis of systematically investigating the hydraulic data of small hole drilling at home and abroad, this paper studies the difference of hydraulic mechanics between small well and conventional well, and deduces a new kind of power law suitable for Bingham, power law on the basis of calculation of annulus pressure consumption of conventional well. Several rheological models, such as Herba, are used to calculate the annular pressure loss of small hole considering the factors of string rotation, drill string eccentricity, drill joint and wall roughness. The effects of different rheological modes of drilling fluid and various influencing factors on annular pressure loss are analyzed. The verification of field measured data shows that the calculation model of annular air pressure loss of small hole established in this paper has a high calculation accuracy. In view of the sensitivity of annulus pressure consumption to the selection of rheological model of drilling fluid, a new method for calculating rheological parameters and optimal selection of rheological model is established, and the theory of optimal design of hydraulic parameters in slim hole drilling is finally improved. By optimizing the rheological model of drilling fluid, the calculation of pressure consumption of circulation system and the calculation of equivalent diameter of nozzle, the optimal design model of hydraulic parameters for slim hole drilling is established and the software for optimal design of hydraulic parameters of slim hole drilling is developed.
【學位授予單位】：西安石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE246

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