カテナリー軌道を用いた水平大偏距掘削における坑井摩擦の低減
Using a Catenary Trajectory to Reduce Wellbore Friction in Horizontal Extended Reach Drilling
ドリルストリングが自重で自然に垂れるカテナリー形状の軌道を設計し、従来の2D円弧設計と比較して坑井摩擦・トルク・ドラッグを低減できることをケーススタディで示した。
著者: Vu Nguyen
分類: cs.RO
原文アブストラクト
Wellbore friction is one of the biggest concerns when drilling due to its relation to the total cost. The catenary concept was introduced to reduce wellbore friction, but it requires detailed analyses. This project would fill this gap. A catenary shape is simply the natural shape of a rope, chain, or drill string. The drill string will then hang freely inside the wellbore. Perfectly, there should be no contact between the hole and the string, and thus no friction. Torque and drag should be minimized this way. A case study is introduced to examine the outcome between Catenary Trajectory Design and traditional 2D Arc design. The calculation procedure of Catenary Trajectory and 2D Arc Design can be found in an MS Excel spreadsheet which is easy to use and reliable for designing catenary well trajectories for extended-reach wells.