Equipment and method for defining drilling mode and using optimized formation to make assess measurement
A drilling and patterning technology, applied in drilling equipment, geophysical surveys, automatic control systems for drilling, etc., which can solve problems such as the influence of MWD and/or LWD measurements
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[0018] refer to figure 1 A drill string 10 comprising a drill pipe 12 and a drill sleeve 14 is placed in the wellbore 16, and the drill bit 18 at the lower end of the drill string 10 is rotated by the output shaft of the motor device 20, and the motor device 20 is used to pass through the drill string 10 downwards. The drilling fluid or mud circulating in the channel is driven. Drilling fluid exits the drill string 10 through jets in the drill bit 18 and then circulates upward in the region between the outside of the drill string 10 and the perimeter of the wellbore 16 . The motor arrangement 20 comprises a power section 22 (rotor / stator or turbine) and a curved subassembly 24 defining a small bending angle, typically 0.5-2 degrees. As is known in the art, when the drill bit 18 is only driven by the mud motor 20 (the drill string is not rotating), the drill bit 18 will deflect in a direction determined by the direction of the tool surface, and the drill string 10 is oriented ...
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