摘要
给出了钻具组合大变形单元刚度的显式表达式。分析中既考虑了应变和位移间的非线性二次项，又通过大位移矩阵计算了刚体位移的大小。非线性方程组采用Ｎｅｗｔｏｎ－Ｒａｐｈｓｏｎ法求解，经相对位移收敛准则检验，收敛性良好。文中通过算例说明了水平并４种钻具组合大变形的物理特性。
An explicit expression for an elmentstiffness of BHA under large deformastion is given.In the BHA analysis,the secondary-class factors ofstrain-displacement formulation was considered anddisplacement of the stiffness with large displacementmatrix was calculated. Nonlinear equation sets weresovied by Newton-Raphson method,examined byrelative displacement convergence criterion, and theconvergence occured rapidly.Examples of four type BHAs for horizontal holes show the physical property of BHA under large deformation.
出处
《石油钻探技术》
北大核心
1995年第1期1-4,共4页
Petroleum Drilling Techniques
关键词
钻井
井底钻具组合
井眼轨迹
钻头
水平井
horizontal drilling,BHA,hole trajectory,bit lateral force,Finite Element method,equilibrium equation
