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- The flexible drill string is one of the key tools to materialize the high accuracy directional drilling technique. 撓性鑽桿是實現高精度定向鑽孔技術的關鍵器具之一。
- The drill string is rotated by rotary table. 鑽柱是由轉盤驅動的。
- Saltwater mud is known to have a very strong corroding effect on drill string. 人們知道,鹽水泥漿對鑽具有很強的腐蝕作用。
- Displace mud with 30 SPM each 30 minutes while working the drill string. 每30分鐘頂替泥漿30沖，同時活動鑽柱。
- The calculation results demonstrate the effective eccentricity and the lifting force of the upper drill string are the major influential factors. 計算結果表明，有效偏心距和上部鑽柱的提升力是影響近井口套管偏磨的主要因素。
- Analysis of friction on drill string in horizontal drilling. 水平井管柱下入摩阻分析及應用。
- You must keep trying to find a new way to protect the drill string from sticking. 你們應當堅持設法找出防止鑽具被卡的新方法。
- In the course of sidetracking of horizontal holes, lateral drill string vibration often occurs. 在水平井的側鑽過程中,鑽柱很容易發生橫向振動,引發鑽柱失效、井眼擴徑等嚴重事故。
- The results show that longitudinal vibration of drill string is relative to rotary speed and weight on bit(WOB). 實驗結果表明,鑽柱的縱向振動主要與轉速和鑽壓有關。
- Its main functions are maintaining borehole gage,improving drill string stability and protecting lower drill string from excessive wear. 其重要作用是保持鑽頭尺寸符合標準，提高鑽桿穩定性，避免鑽桿下部過於磨損。
- An example proved the view, while the WOB is transferred by spring and fluid pressure, the vibration of drill string can lie diminished. 實例分析驗證了這種觀點。同時由於壓力是靠彈簧和液壓傳遞的，所以其還有減振的效果。
- Therefore we can provide the preanalysis and treatment plans for similar drill string falling accident,so as to shorten accident-losing tim... 為現場處理類似的鑽柱落井事故提供預先的分析和處理方案,以縮短事故處理時間,減少經濟損失。
- Based on the interaction of bit and formation, the force from the rock and bit is used for the boundary condition of the end of the drill string. 在建立了牙輪鑽頭與井底岩石互作用模型的基礎之上,將鑽頭與井底岩石互作用力矩作為鑽柱的下端邊界條件。
- A multithread wireless system is developed to measure the four-component forces acting on a simulated drill string on a LabVIEW workbench. 為分析鑽桿的井下受力狀態,應用直梁應變片式測力感測器,研製了一種基於虛擬儀器平台的鑽桿四分量力測量系統。
- The bigger the effective eccentricity, the higher the upper drill string's lifting force, the higher the positive pressure on casing/ drill string, and the more serious the wear. 有效偏心距越大，上部提升力越大，套管/柱之間的正壓力將越大，磨損將越產重。
- The analyze of this paper is based on the practice, it can provide bases to Straight Well as well as ERW drill string dynamic problem, it is valuable in engineering. 本文的分析切合實際，對直井及大位移井鑽柱因振動而引起的動態問題的分析提供依據，具有工程使用價值。
- Fluid is conveied to bit nozzel through drill string from pump is a transient state flowing with pressure wave, which makes the fluid jetted out from nozzel has certain pulsation. 從鑽井泵經過鑽柱內部輸送到鑽頭噴嘴的流體是一種瞬態流動，存在著壓力行波，使從普通噴嘴射出的流體有一定程度的脈動。
- Method We established perfect nursing emergency project,set up nursing risk management team,designed scientific and flexible drilling scene and methods and focused on continuity quality improvement. 方法制訂完善的護理應急預案,成立健全的護理風險管理組織,設置科學、靈活的演練場景及方法,堅持質量持續改進。
- The drill string of ERW is taken as research object, the dynamic problem is brought forward during making hole, and the mechanics model about each dynamic action is established. 以大位移井鑽柱的部分或整體為研究對象，提出了鑽井各種動態問題，建立了鑽柱的各種動態行為的力學模型。
- The classical fracture mechanic can only explain the static fracture problem of drill string, but it is incapble of explain drill string failure under dynamic load. 傳統的斷裂力學只能解釋石油管柱靜態斷裂問題，而不能解釋動載下鑽柱失效問題。
