發(fā)布時(shí)間：2019-08-20 16:48

【摘要】：在一般力學(xué)中,系統(tǒng)都要遵循平衡原理、最小勢(shì)能原理和最小耗散功率原理。鉆柱力學(xué)也遵循這三原理。鉆柱的任何一點(diǎn)、任何時(shí)刻,都必須滿足力學(xué)平衡方程;若出現(xiàn)多解,先用最小勢(shì)能原理判斷;若還存在多解,則用最小耗散功率原理判斷。用鉆柱失穩(wěn)問(wèn)題說(shuō)明了最小耗散功率原理不包含最小勢(shì)能原理;不可用最小耗散功率原理取代最小勢(shì)能原理。實(shí)驗(yàn)發(fā)現(xiàn):1桿柱的轉(zhuǎn)速越高,其撓度越小,越靠井筒中心。2存在渦動(dòng)狀態(tài)轉(zhuǎn)換臨界轉(zhuǎn)速。當(dāng)轉(zhuǎn)速低于此臨界轉(zhuǎn)速時(shí),隨著轉(zhuǎn)速的增加,耗散功率增加;當(dāng)轉(zhuǎn)速高于此臨界轉(zhuǎn)速時(shí),隨著轉(zhuǎn)速的增加,耗散功率先迅速降低并且桿柱的撓度突然減小,然后隨著轉(zhuǎn)速的增加,耗散功率又增加。3液體的黏度越大,渦動(dòng)狀態(tài)轉(zhuǎn)換臨界轉(zhuǎn)速越小;軸向載荷越大,渦動(dòng)狀態(tài)轉(zhuǎn)換臨界轉(zhuǎn)速越小。鉆柱力學(xué)三原理為復(fù)雜的鉆柱動(dòng)力學(xué)問(wèn)題的多解性判別提供了新的判據(jù)。
[Abstract]:In general mechanics, the system should follow the principle of balance, the principle of minimum potential energy and the principle of minimum dissipative power. Drill string mechanics also follows these three principles. Any point of drill string must satisfy the mechanical equilibrium equation at any time. If there are multiple solutions, it is judged by the principle of minimum potential energy, and if there are still multiple solutions, it is judged by the principle of minimum dissipative power. With the problem of drill string instability, it is shown that the principle of minimum dissipative power does not include the principle of minimum potential energy, and the principle of minimum dissipative power can not be used to replace the principle of minimum potential energy. The experimental results show that: (1) the higher the rotating speed of the rod string is, the smaller the deflection is and the closer it is to the center of the wellbore. (2) there is a critical speed of vortex state transition. When the rotational speed is lower than this critical speed, the dissipative power increases with the increase of rotating speed; when the rotational speed is higher than this critical speed, the dissipative work decreases rapidly and the deflection of rod string decreases suddenly, and then the dissipative power increases with the increase of rotating speed. 3 the greater the viscosity of liquid, the smaller the critical speed of vortex state transition; the larger the axial load, the smaller the critical speed of vortex state transition. The three principles of drill string mechanics provide a new criterion for judging the multiple solutions of complex drill string dynamics problems.
【作者單位】： 燕山大學(xué)石油工程研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.51244004,No.51374183,No.51490653)資助
【分類號(hào)】：TE21

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