页岩气旋转式井壁取心器转向机构设计与优化

转向机构作为页岩气旋转式井壁取心器的连接转向装置,其性能决定了取心器的过弯通过能力.鉴于此,设计了一种新型转向机构.该机构中心由一个胡克铰链连接,四周设置4组由移动副和弹簧连接的球面副;利用拆杆法建立了转向机构各零件的静力学平衡方程,确定了转向机构的工作空间,建立了取心器过弯能力与水平井曲率半径的函数关系;以通过能力最...

Design and Optimization of Steering Device for Shale Gas Rotary Sidewall Coring

The steering mechanism is used as the connecting steering device of the shale gas rotary sidewall coring tool,and its performance determines the bend pass capacity of the entire tool. In view of this,a new type of steering mechanism is designed. The center of the mechanism is connected by a Hooker hinge. There are 4 sets of spherical pairs connected by moving pairs and springs around it. The static balance equation of each part of the steering mechanism is established by the method of dismantling the rod. The work space of the steering mechanism is determined according to the work requirements. The function relationship between the coring tool’s bend pass capacity and the radius of curvature of the horizontal well is established. Taking the maximum bend pass capacity as the optimization goal,the modular dimension optimization of the coring tool is carried out. The analysis results show that under the same horizontal wellbore diameter,the radius of curvature and the length that the coring tool can pass are positively correlated. Under the same radius of curvature,the wellbore diameter and the length that the coring tool can pass are also positively correlated. Given the curvature radius of 20 m and the wellbore diameter of 150 mm,the effective passing length of the coring tool increases from 3. 102 m to 10. 358 m after optimization. The new steering mechanism can effectively improve the bend pass capability of the coring tool and increase the effective length of the coring tool.