需要金幣： 1000 個金幣 |
資料包括：完整論文 |  |
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| 轉(zhuǎn)換比率：金額 X 10=金幣數(shù)量， 例100元=1000金幣 | 論文字數(shù)：19948 |  | |
| 折扣與優(yōu)惠：團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘 要：由井下隨鉆測量的數(shù)據(jù)可知，鉆柱在鉆進過程中伴隨著各種振動，主要包括軸向、橫向和扭轉(zhuǎn)振動，還包括一些異常振動，如粘滑振動。鉆柱的粘滑振動是由劇烈的扭轉(zhuǎn)振動和井下摩擦阻所產(chǎn)生的。粘滑振動的現(xiàn)象是：開始一段時間鉆頭可以保持靜止不動或勻速運動，當施加在鉆柱速度上的外部扭矩過大時，鉆頭突然有了一個非常大的初始轉(zhuǎn)動速度最大轉(zhuǎn)速甚至超過了轉(zhuǎn)盤轉(zhuǎn)速的2~6倍。這時在鉆柱的粘滑振動過程中，鉆頭的轉(zhuǎn)速如果在瞬間達到了很大的值，那么就會很容易造成鉆柱損壞。另外，在粘滑振動過程中扭矩波動很大，這不僅影響鉆井效率也威脅鉆井安全，實際扭矩過大可能超過設(shè)備所能承受的極限扭矩，致使鉆井無法進行。我們用四維模型建立模擬井下鉆柱的運動，然后采用數(shù)值模擬仿真，以定功率的方式手段，研究粘滑振動的特點，及其規(guī)律，并找到相關(guān)參數(shù)得以控制粘滑振動，減少粘滑振動的不利影響。 關(guān)鍵詞: 滑動運動；非線性控制；四維模型；模擬仿真
Abstract：By the downhole MWD data shows,in the process of drilling, drill string, along with a variety of vibration, including axial, lateral and torsional vibration, but also including some abnormal vibration, such as stick-slip vibration. The stick-slip vibration of the drill string is generated by severe torsional vibration and downhole friction resistance. the phenomenon of stick-slip vibration is:Begin a period of time the drill bit can remain stationary or uniform motion, when the external torque applied to the speed of the drill string is too large, drill suddenly have a very large initial rotation speed of maximum speed that even more than the rotary speed of 2 to 6 times. Then, in the process of stick-slip vibration of the drill string, the drill speed in an instant to achieve a great deal of value, would be likely to cause the drill column damage. In addition, torque fluctuations would be very large in the process of stick-slip vibration, which affects not only the drilling efficiency,- is also a threat to drilling safety, the actual torque is too large may exceed the equipment can withstand, resulting in the drilling can not run. We use the four-dimensional model to simulated the downhole drill string movement, and then using numerical simulation and given the power means to study the characteristics of stick-slip vibration, and its laws, to find parameters to control the stick-slip vibration, reduce stick-slip vibrationthe adverse effects of stick-slip vibration. Key words：Drilling string; Stick-slip osciallation; Simulation; Four dimensional mechanic model |
