本文選題：井底應(yīng)力場 + 柔性鉆具組合�。� 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：柔性鉆具組合是最近提出來的一種鉆具組合,并在油田某些區(qū)塊收到很好的應(yīng)用效果,該鉆具組合安裝有柔性接頭,通過穩(wěn)定器的配合,能改變鉆頭軸線的偏轉(zhuǎn)方向和受力狀態(tài)。柔性接頭鉆具組合防斜打快機理研究是基于柔性鉆具組合在易斜地層中的應(yīng)用,本文從以下幾個方面開展了工作： 1.采用有限元法建立了直井的井底應(yīng)力場分析模型,分析了不同因素下各向異性地層井底應(yīng)力場的分布差異,探討了不同因素對井底應(yīng)力場及井眼軌跡的影響。研究表明,不同節(jié)理面傾角巖體發(fā)生應(yīng)力集中的位置受節(jié)理面與井眼相交的影響較大,井眼內(nèi)的液柱壓力越小,井底巖石越容易受到拉應(yīng)力破壞,易產(chǎn)生偏斜；節(jié)理面間距越小,應(yīng)力集中發(fā)生次數(shù)越多,巖石更容易破壞,產(chǎn)生偏斜；水平主應(yīng)力的大小和方向會改變井眼偏斜方向；大尺寸井眼中,井底井眼附近巖石更容易發(fā)生破壞；考慮鉆壓作用的井底井周附近的巖石應(yīng)力增大,更容易發(fā)生應(yīng)力集中現(xiàn)象。 2.從靜力學(xué)上分析了柔性鉆具組合的防斜原理,其降斜的條件是柔性接頭的中心位于井眼軸線上,主要靠加壓改變鉆具變形產(chǎn)生的撓曲方向,使近鉆頭穩(wěn)定器緊貼于上井壁,在加壓鉆進中實現(xiàn)鉆頭偏轉(zhuǎn)角下傾,產(chǎn)生降斜趨勢；建立了柔性鉆具組合靜力學(xué)分析模型,實例計算表明,柔性鉆具組合的鉆頭降斜力隨鉆壓和井斜角增大而增大,在井眼產(chǎn)生井斜的條件下,相比常規(guī)鐘擺鉆具組合具有更好的防斜性能。 3.基于地層和鉆頭的相互作用模型,考慮鉆頭各向異性和地層各向異性的影響,采用“井斜趨勢角”綜合指標對防斜鉆具組合的防斜性能進行分析；實例計算表明,在地層特性和鉆頭特性相同條件下,隨著鉆壓的增大,柔性鉆具的井斜趨勢角明顯大于鐘擺鉆具組合,其降斜趨勢更明顯,在大鉆壓下能更好地發(fā)揮其防斜性能。 4.運用轉(zhuǎn)子動力學(xué)理論和虛功原理建立了底部鉆具組合的動力學(xué)分析模型,以距離鉆頭較近的帶柔性接頭的鉆鋌段為研究對象,探討分析了鉆壓和井斜影響下的鉆鋌形心渦動規(guī)律；動力學(xué)仿真結(jié)果表明,在鉆井液中渦動特征為向前渦動,井斜角越大,鉆鋌形心偏向下井壁的運動越明顯；適當(dāng)?shù)脑黾鱼@壓,對于鉆井過程中的防斜和糾斜是有利的；鉆壓波動頻率較大時,影響鉆頭對上下井壁的切削位置和程度。
[Abstract]:The flexible drilling pipe assembly is a kind of drilling tool combination that has been put forward recently, and has received very good application effect in some blocks of the oil field. The assembly is equipped with flexible joint, which is matched by stabilizer.The deflection direction and force state of the bit axis can be changed.Based on the application of flexible drilling tool combination in easy slant formation, the research on the mechanism of flexible joint drilling tool combination is based on the application of flexible drilling tool combination in easy slant formation. This paper has carried out the work from the following aspects:1.The analysis model of bottom hole stress field in vertical well is established by using finite element method. The distribution difference of bottom hole stress field in anisotropic formation under different factors is analyzed, and the influence of different factors on bottom hole stress field and borehole trajectory is discussed.The results show that the position of stress concentration in inclined rock mass with different joint planes is greatly affected by the intersection of joint plane and borehole, and the smaller the pressure of liquid column in borehole, the easier the rock in bottom hole to be destroyed by tensile stress and inclined.The smaller the joint plane spacing, the more stress concentration occurs, the more easily the rock will be destroyed, the more inclined the horizontal principal stress will be, and the more easily the rock near the bottom hole will be destroyed in the large size well.The stress concentration is more likely to occur when the rock stress around the bottom hole increases with the consideration of drilling pressure.2.In this paper, the anti-deviation principle of flexible drilling tool combination is analyzed statically. The condition of reducing deviation is that the center of flexible joint is located on the shaft line, and the deflection direction caused by the deformation of the drill tool is mainly changed by pressure, which makes the near bit stabilizer stick close to the upper shaft wall.A static analysis model of flexible drilling tool combination is established, and the calculation results show that the deflecting force increases with the increase of drilling pressure and inclined angle.Under the condition of borehole deviation, it has better anti-deviation performance than conventional pendulum drilling tool combination.3.Based on the interaction model of formation and bit, considering the influence of anisotropy and anisotropy of drill bit, the comprehensive index of "well inclination trend angle" is used to analyze the anti-deviation performance of anti-slant drilling tool combination.Under the same conditions of formation characteristics and bit characteristics, with the increase of drilling pressure, the inclined angle of flexible drilling tools is obviously larger than that of pendulum drilling tool combinations, and the tendency of slanting reduction is more obvious, and the anti-deviation performance of flexible drilling tools can be better brought into play under high drilling pressure.4.Based on the rotor dynamics theory and virtual work principle, the dynamic analysis model of bottom drill tool combination is established. The drill collar section with flexible joint near the bit is taken as the research object.The dynamic simulation results show that the vortex characteristic of drill collar is forward vortex in drilling fluid, and the bigger the angle of well is, the more obvious the movement of drill collar center is under the lower shaft wall deviation, and the more inclined angle is, the more obvious the movement of drill collar center is under the influence of drilling pressure and well deviation, and the dynamic simulation results show that the vortex characteristic is forward vortex in drilling fluid.A proper increase of drilling pressure is beneficial to the prevention and correction of deviation during drilling, and when the frequency of drilling pressure fluctuation is large, it will affect the cutting position and degree of drill bit to the upper and lower shaft wall.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE921

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