eccentric bit 中文意思是什麼
eccentric bit
解釋
偏心刀尖塊-
Along with the progress of drilling technology, many new types of bha such as steering motor assembly, dropping assembly with eccentric bend sub, dropping assembly with flexible connection are developed based on common building, dropping and holding assemblies. for using these bha, a new mathematical model is put forward for 3d static analysis of these types of bha under small deflection. and its weighted residual solution is given. the mathematical model includes ( 1 ) differential equations ; ( 2 ) boundary conditions at drill bit, stabilizer, bend angle, diameter change, tangential point and borehole wall ; ( 3 ) lateral forces and deflection angles of bit. the software based upon this method runs well
為了更好地應用各種新鉆具，建立了適用於對普通下部鉆具、導向鉆具、帶偏心彎接頭和柔性接頭的下部鉆具進行三維小撓度靜力學分析的數學模型，包括（ 1 ）微分方程； （ 2 ）鉆頭、穩定器、彎角、變截面、切點和井壁的邊界條件； （ 3 ）鉆頭的側向力和鉆頭轉角.給出了該模型的加權余量解.用該方法編寫的軟體應用效果良好 -
Eccentric underreaming bit
管下擴眼偏心鉆頭 -
Field application result shows that for eccentric screw stabilizer, there exist errors of calculated outside diameters and measured diameters, the upper stabilizer has severe influence on side force of drilling bits, and it can be optimally designed, while the bending angle of screw also has severe influence on bit side force, and it should be rationally used
現場使用結果表明，螺桿本體穩定器採用偏心式時計算外徑與丈量直徑存在偏差；上穩定器對鉆頭側向力具有較大的影響，可以優化設計；螺桿彎角對鉆頭側向力影響較大，需合理使用。
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