# Measurement Method of Whole Mechanical Automatic Vertical Drilling Tools
## 2 Methods  
### Measuring Object  
As a result of optimization and improvement, there are many kinds of vertical drilling. To verify the test method accurately, this work used a comparative analysis of multiple tools and selected two common vertical drills of typical VDS tools as test objects. The O-MVDT and the N-MVDT are two vertical drills widely used in the drilling industry. Before testing, the performance of the drills was analyzed according to their working principles. In this section, the working principle of the MVDT before and after optimization is introduced, and the direct relationship between the angle of the heavy block and the thrust in the stable platform is analyzed. A schematic diagram of the MVDT stable platform is shown in Figure 2b, and the connection states are shown in Figure 2c. The structure of the MVDT is shown in Figure 2b. The partial block drives the upper disk valve to rotate synchronously. The upper plate valve is designed to have an arc hole (upper arc hole) opposite the offset block. When the offset block stops at the bottom side of the well, the upper arc hole stops at the theoretical hole height position. The lower plate valve rotates synchronously with the vertical drill housing and is connected to the actuator flow path and the upper arc hole through three lower arc holes. The actuator does not rotate with the drilling tool; it is mainly composed of several pushing fins and corresponding flow channels. When the flow path is open, high-pressure drilling fluid is pushed out through the flow path against the wing rib. When the drilling tool tilts, the heavy block in the stable platform deflects under the action of gravity and finally stops at the lower side of the theoretical hole, and the upper arc hole stops at the higher side of the theoretical hole. With the rotation of the foot disk valve, the lower arc hole passes through the upper arc hole successively, and the drilling fluid flows into the channel through the upper and lower arc holes. The wing rib (LSR) near the low side is not pushed out, but the wing rib (USR) near the high side is pushed out to the wall. Then, the drilling tool is subjected to the wall reaction force, and the drilling tool attitude is corrected. With the turn-on and turn-off caused by the rotation of the lower disc valve, the vertical drill presents two different opening states. In Figure 2c, the position relationship of the MVDT structure is represented by the projection of views B-C and B-D. When the upper arc hole is connected to the lower arc hole, this state can be recorded as the L state. After the upper arc hole is parked on the high side of the hole, the passage near the high side of the hole is also connected to the lower arc hole by the rotation of the lower arc hole. The drilling fluid enters the rotating lower arc hole through the upper arc hole and then enters the channel and pushes out against the wing rib. The state in which the lower arc hole, the upper arc hole, and the channel are connected is called state \(H\). States H and \(L\) both occur several times during a cycle (\(L\)) of drill pipe rotation. When the channel is in the \(L\) state, part \(F\) of the corresponding fan blade of the channel presents a low thrust with multiple periodic changes, which is denoted as \(F_{L}\) (because of the gap between the footer valve and the channel, a small amount of liquid still enters the channel under the \(L\) state, and the discharge of the actuator is delayed, so the thrust at this time is not 0). When the channel is in the \(H\) state, the \(F\) part of the sector corresponding to the channel has a higher thrust (\(F_{H}\)) and has multiple periodic changes. Figure 3A-A presents a detailed profile of the relative position of the upper orifice, encompassing both the pink external cylinder valve and the blue internal cylinder valve. Figure 3B-B, on the other hand, provides a detailed depiction of the relative position of the lower orifice.