發(fā)布時(shí)間：2018-03-13 10:01

  本文選題：牙輪鉆頭　切入點(diǎn)：軸承結(jié)構(gòu)　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】：牙輪鉆頭在井底的工作條件較為惡劣,主要承受軸向振動(dòng)載荷、扭轉(zhuǎn)振動(dòng)載荷和橫向振動(dòng)載荷,軸承失效是牙輪鉆頭失效的主要原因。隨著深井和超深井的不斷增多,深部地層鉆進(jìn)需要的小尺寸三牙輪鉆頭越來越多,要求軸承能適應(yīng)高鉆壓、高轉(zhuǎn)速。但小尺寸三牙輪鉆頭布齒空間極其有限、殼體厚度較小,且牙爪軸承尺寸相對(duì)較小,為了提高鉆速,在高鉆壓、高轉(zhuǎn)速下常常發(fā)生軸承失效。因此,對(duì)小尺寸牙輪鉆頭軸承結(jié)構(gòu)進(jìn)行分析研究,具有極其重要的意義。 本文以小尺寸三牙輪鉆頭為研究對(duì)象,建立了包含牙爪、牙輪和牙齒的牙輪鉆頭軸承模型,用ABAQUS有限元分析軟件進(jìn)行靜強(qiáng)度分析,獲得了軸承結(jié)構(gòu)Mises應(yīng)力和接觸壓力分布情況；用Fe-Safe軟件作軸承結(jié)構(gòu)疲勞強(qiáng)度分析,獲得了軸承結(jié)構(gòu)疲勞壽命和安全系數(shù)；用DOE試驗(yàn)設(shè)計(jì)技術(shù),通過改變軸承結(jié)構(gòu)大軸頸長度、小軸頸長度、大軸頸直徑和小軸頸直徑的不同尺寸,對(duì)牙輪鉆頭軸承結(jié)構(gòu)開展結(jié)構(gòu)參數(shù)敏感性研究,分析了交互作用對(duì)軸承結(jié)構(gòu)參數(shù)敏感性的影響,并根據(jù)參數(shù)變化對(duì)牙輪鉆頭軸承結(jié)構(gòu)強(qiáng)度的影響,對(duì)軸承結(jié)構(gòu)參數(shù)作優(yōu)化研究。 通過以上對(duì)小尺寸三牙輪鉆頭軸承結(jié)構(gòu)的分析,建立了牙輪鉆頭軸承結(jié)構(gòu)靜強(qiáng)度、疲勞強(qiáng)度的分析規(guī)范和評(píng)價(jià)指標(biāo),確定軸承結(jié)構(gòu)參數(shù)變化對(duì)軸承靜強(qiáng)度和疲勞強(qiáng)度的影響,最終得到合理的軸承結(jié)構(gòu)設(shè)計(jì)參數(shù),對(duì)指導(dǎo)小尺寸牙輪鉆頭軸承結(jié)構(gòu)設(shè)計(jì)、開發(fā)牙輪鉆頭具有較大的意義。
[Abstract]:The working conditions of cone bit at the bottom of the hole are relatively bad, mainly bearing axial vibration load, torsional vibration load and transverse vibration load. Bearing failure is the main cause of cone bit failure. More and more small size three-cone bits are needed for drilling in deep formation, which requires bearings to adapt to high drilling pressure and high rotation speed. However, small size three-cone bits have extremely limited space for tooth distribution, smaller shell thickness, and relatively small size of claw bearings. In order to improve the drilling speed, bearing failure often occurs at high drilling pressure and high speed. Therefore, it is of great significance to analyze and study the bearing structure of small-sized cone bit. In this paper, the bearing model of small size three-cone bit is established, which includes claw, cone and tooth. The static strength of the bearing is analyzed by ABAQUS finite element analysis software. Mises stress and contact pressure distribution of bearing structure are obtained, fatigue life and safety factor of bearing structure are obtained by fatigue strength analysis of bearing structure with Fe-Safe software, and large journal length of bearing structure is changed by DOE test design technique. Different dimensions of small journal length, large journal diameter and small journal diameter, the structural parameter sensitivity of roller bit bearing structure is studied, and the influence of interaction on bearing structural parameter sensitivity is analyzed. According to the influence of the change of parameters on the structural strength of roller bit bearing, the structural parameters of bearing are optimized. Based on the above analysis of the bearing structure of the small size three-cone bit, the static strength and fatigue strength analysis criterion and evaluation index of the bearing structure are established, and the influence of the structural parameters of the bearing on the static strength and fatigue strength of the bearing is determined. Finally, reasonable design parameters of bearing structure are obtained, which is of great significance to guide the design of bearing structure of small size cone bit and to develop cone bit.
【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)】：TE921.1

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