本文關(guān)鍵詞： 復(fù)合鉆井 鉆柱振動(dòng) 動(dòng)力學(xué) 井斜控制 有限元分析　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：當(dāng)今,螺桿鉆具匹配PDC鉆頭的復(fù)合鉆井技術(shù)已經(jīng)成為鉆井工程領(lǐng)域的主流工藝技術(shù),大量的現(xiàn)場(chǎng)應(yīng)用證明其能夠有效地提高鉆井速度、縮短鉆井周期、降低鉆井綜合成本。本文收集和調(diào)研了大量復(fù)合鉆井、鉆柱動(dòng)力學(xué)等方面的相關(guān)文獻(xiàn)資料,通過分析這些資料并結(jié)合鉆井現(xiàn)場(chǎng)實(shí)際情況,了解了該領(lǐng)域的發(fā)展趨勢(shì),明確了本文的研究方法和思路。 在前人研究的基礎(chǔ)上,根據(jù)復(fù)合鉆井自身的特點(diǎn),建立了鉆柱縱向振動(dòng)、橫向振動(dòng)、扭轉(zhuǎn)振動(dòng)的有限元模型,研究了鉆柱模態(tài)變化規(guī)律和振型,計(jì)算了鉆柱動(dòng)態(tài)響應(yīng)特征。利用非線性動(dòng)力學(xué)原理,建立了復(fù)合鉆井下部鉆柱—鉆頭—地層的三維有限元數(shù)值模型。最后,結(jié)合現(xiàn)場(chǎng)定向鉆井所遇到復(fù)合鉆井井斜控制問題,分析了鉆壓、螺桿彎角、穩(wěn)定器安裝位置等因素對(duì)復(fù)合鉆井井斜控制能力的影響規(guī)律。本文研究成果為復(fù)合鉆井動(dòng)力學(xué)研究、復(fù)合鉆井井斜控制能力分析開辟了新的思路,為復(fù)合鉆井的進(jìn)一步發(fā)展和應(yīng)用提供了理論基礎(chǔ)和技術(shù)保障。本文主要研究?jī)?nèi)容和取得的成果如下： (1)根據(jù)非線性振動(dòng)理論為基礎(chǔ),建立了復(fù)合鉆井鉆柱全井段有限元模型,計(jì)算出了鉆柱縱向振動(dòng)、橫向振動(dòng)、扭轉(zhuǎn)振動(dòng)的固有頻率和各階振型,并進(jìn)行了諧響應(yīng)分析。通過計(jì)算分析得了復(fù)合鉆井鉆柱的縱、橫、扭各階固有頻率以及各階響應(yīng)位移隨井深的變化關(guān)系。通過諧響應(yīng)分析計(jì)算了在不同激振頻率下,復(fù)合鉆井鉆柱的共振特性,得到了其共振時(shí)的響應(yīng)位移和響應(yīng)應(yīng)力,據(jù)此可以判斷鉆柱的危險(xiǎn)點(diǎn)位置。 (2)建立了復(fù)合鉆井下部鉆柱一鉆頭—地層—井壁的三維有限元模型,并通過給“地層”施加反向的轉(zhuǎn)速來等效螺桿的轉(zhuǎn)速,使模型更接近于真實(shí)的復(fù)合鉆井工況。采用ABAQUS顯示積分算法進(jìn)行求解,研究了復(fù)合鉆井工況時(shí)下部鉆柱與井壁的碰撞力、鉆頭與井底巖石接觸產(chǎn)生的軸向力的特點(diǎn)；復(fù)合鉆井對(duì)下部鉆柱縱、橫向加速度的影響規(guī)律；復(fù)合鉆井對(duì)鉆柱扭矩和動(dòng)態(tài)應(yīng)力的影響。 (3)對(duì)復(fù)合鉆井井斜控制問題進(jìn)行了研究。結(jié)合鉆井現(xiàn)場(chǎng)數(shù)據(jù),建立了相應(yīng)的復(fù)合鉆井下部鉆具組合有限元模型,分析了鉆壓、螺桿彎角、穩(wěn)定器安裝位置等因素對(duì)復(fù)合鉆井井斜控制能力的影響規(guī)律,仿真結(jié)果與實(shí)際工況基本吻合,為優(yōu)化復(fù)合鉆井下部鉆具結(jié)構(gòu)提供了理論依據(jù),可有效的指導(dǎo)現(xiàn)場(chǎng)施工
[Abstract]:Nowadays, the compound drilling technology of screw drill tool matching PDC bit has become the mainstream technology in drilling engineering field. A large number of field applications have proved that it can effectively improve the drilling speed and shorten the drilling period. In order to reduce the comprehensive cost of drilling, this paper collects and investigates a large number of related documents on compound drilling, drill string dynamics, and so on. By analyzing these data and combining with the actual situation of drilling site, we understand the development trend in this field. The research methods and ideas of this paper are clarified. On the basis of previous research, according to the characteristics of compound drilling, the finite element models of longitudinal, transverse and torsional vibration of drill string are established, and the modal variation law and mode shape of drill string are studied. The dynamic response characteristics of drill string are calculated. Based on the nonlinear dynamic principle, a three-dimensional finite element numerical model of drilling string, drill bit and formation in the lower part of composite drilling is established. The effects of drilling pressure, screw bending angle and stabilizer installation on the control ability of compound drilling well are analyzed. The research results of this paper have opened up a new way of thinking for the study of compound drilling dynamics and the analysis of compound drilling well deviation control ability. It provides the theoretical basis and technical guarantee for the further development and application of compound drilling. The main contents and achievements of this paper are as follows:. 1) based on the nonlinear vibration theory, the finite element model of the whole section of drilling string in compound drilling is established, and the natural frequencies and modes of the longitudinal vibration, transverse vibration and torsional vibration of the drill string are calculated. The relationship between the natural frequencies of longitudinal, transverse and torsional drill string and the displacement of each order response with well depth is obtained. The harmonic response analysis is used to calculate the relationship between the natural frequency and the displacement of the drill string at different exciting frequencies. The resonance characteristics of the drill string in compound drilling have obtained the response displacement and the response stress of the drill string during the resonance, and the dangerous point position of the drill string can be judged according to the response displacement and the response stress of the drill string. In this paper, a three-dimensional finite element model of drill string, drill bit and wellbore in the lower part of compound drilling is established, and the rotating speed of screw is equivalent by applying reverse rotation speed to formation. ABAQUS display integral algorithm is used to solve the model. The collision force between the lower drill string and the shaft wall and the axial force caused by the contact between the drill bit and the bottom rock during the combined drilling condition are studied. The influence of compound drilling on the longitudinal and lateral acceleration of the lower drill string and the influence of compound drilling on the drilling string torque and dynamic stress. Based on the drilling site data, the combined finite element model of the lower drilling tool is established, and the drilling pressure and screw bending angle are analyzed. The influence of stabilizer installation position on the deviation control ability of composite drilling wells is basically consistent with the actual working conditions. The simulation results provide a theoretical basis for optimizing the structure of drilling tools in the lower part of composite drilling, which can effectively guide the field construction.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE242.9

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