Horizontal well deflecting section pumping liquid displacement control method

The invention provides a horizontal well deflecting section pumping liquid displacement control method. The horizontal well deflecting section pumping liquid displacement control method comprises the steps of determining well parameters, gun string parameters and pumping liquid property parameters; inputting the parameters into the control module; in the construction process, enabling a data acquisition module installed on the gun string to acquire the cable tripping-in speed, the gun string position, the gun string speed and the pumping liquid displacement; determining the critical displacement of pumping liquid; comparing the collected pumping liquid displacement with the critical displacement; if the actual displacement of the pumping liquid is smaller than the critical displacement, increasing the displacement of the pumping liquid through a control system; if the actual displacement of the pumping liquid is far greater than the critical displacement, reducing the displacement of the pumping liquid proper