US Patent 12078062 Automated inflow negative test process

A method to perform an inflow negative test of a wellbore is disclosed. The method includes disposing a flow measuring sub in a drill string to mechanically connect a drill pipe joint and a drill pipe, and sustaining a fluid flow downstream along an annulus and upstream along the drill pipe. The fluid flow reverses direction through an open port in a wall of the drill pipe or an open end of the drill pipe, and returns to a mud tank from the drill pipe through the flow measuring sub and the drill pipe joint. Flow measurement data of fluid movement through the flow measuring sub is generated using a measuring device of the flow measuring sub and sent to a computer device of the flow measuring sub. Accordingly, a success/failure result of the inflow negative test is determined using the computer device based at least on the flow measurement data.