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井下工具及测井仪器上大量应用的板簧扶正器是利用板簧的弹性变形使工具位于油井中心位置或形成仪器与井壁间压力,借以向井壁发射信号及接收信号。微电极测井仪的极板部分如图1所示,其中1为板簧,2为与板簧联接的极板。当仪器下井时板簧变形,对称装置的极板2间的距离缩小,仪器被压缩在油井中,因而形成极板与井壁间的压力。板簧变形与井壁间压力之间关系是扶正器设计中的关键问题。从工作情况看出:板簧工作过程中有大的位移,而板簧结构内部的应变是微小的。因而,用小变形线性方程计算必然有大的误差,故板簧变形计算必须以大变形非线性来处理之。众所周知,在小变形
Downhole tools and logging tools used in a large number of leaf spring centralizer is the use of elastic deformation of the leaf spring so that the tool is located in the center of the well or the formation of pressure between the instrument and the shaft wall in order to transmit signals to the shaft wall and receive signals. The pole part of the microelectrode tool is shown in Figure 1, where 1 is the leaf spring and 2 is the plate connected with the leaf spring. When the instrument goes down, the leaf springs deform, the distance between the plates of the symmetrical device is reduced, and the instrument is compressed in the oil well, thus forming the pressure between the electrode plate and the well wall. The relationship between the deformation of the leaf spring and the pressure between the wellbores is a key issue in the design of centralizer. As can be seen from the working conditions, there is a large displacement during the leaf spring work, and the strain inside the leaf spring structure is slight. Therefore, small deformation linear equations must have a large error, so the calculation of leaf spring deformation must be large deformation nonlinearity to deal with it. As we all know, small deformation