Abstract: The invention discloses a calculation method for dynamic fluid loss of acid-etched fracture considering wormhole propagation, which is applied to pad acid fracturing process, comprising the following steps: Step 1: dividing the construction time T of injecting acid fluid into artificial fracture into m time nodes at equal intervals, then the time step ?t=T/m and tn=n?t, where, n=0, 1, 2, 3, . . . , m, and to is the initial time; Step 2: calculating the fluid loss velocity vl(0) in the fracture at t0; Step 3: calculating the flowing pressure distribution P(n) in the fracture at tn; Step 4: calculating the width wa(n) of acid-etched fracture at tn; Step 5: calculating the wormhole propagation and the fluid loss velocity vl(n) at tn; Step 6: substituting the fluid loss velocity vl(n) into Step 3, and repeating Step 3 to Step 6 in turn until the end of acid fluid injection.

Abstract: An objective of the present invention is to provide a system for remotely controlling a controlled device. The system comprises 1) emitting means comprising a light-emission source for sending a control signal; 2) detecting means comprising a camera unit for acquiring imaging information of the control signal in the camera unit; 3) computing means for determining location information of the emitting means based on the imaging information acquired by the detecting means; 4) controlling means for determining a control instruction corresponding to the location information so as to control a controlled device connected to the system.