Spotting Fluids are used to free pipe by penetrating and breaking up the filter cake. The spotting fluids comprise a liquid, either aqueous or oleaginous. The spotting fluids are used in a conventional method of releasing pipes or tools stuck in the filter cake on the sides of a borehole during conventional drilling or well servicing operations.
Spray bar consists of a nozzles and an elongated header for spraying liquid. The nozzle is mounted in openings in the bottom plate and sealing cooperate with the intermediate plate and extend through the liquid cavity. The flow of liquid through each of the nozzles is independently regulated by varying a control fluid signal.