Perforation cleaning tool
Pressure operated valve
Perforation cleaning tools
Method and apparatus for erosive stimulation of open hole formations
Surface switchable down-jet/side-jet apparatus Patent #: 5533571
ApplicationNo. 169910 filed on 10/12/1998
US Classes:166/306, Fluid enters and leaves well at spaced zones166/318Operated by dropped element
ExaminersPrimary: Neuder, William P.
Assistant: Kreck, John
Attorney, Agent or Firm
International ClassE21B 043/25
AbstractAn apparatus and method for selectively stimulating a plurality of producing zones of an openhole wellbore in oil and gas wells in one trip. The assembly includes a plurality of modules connected in a tailpipe wherein the modules can be selectively actuated to conduct a matrix acidizing job and near wellbore erosion job on producing zones of interest in the wellbore. Each module includes a sleeve shiftable between a closed position and a treating position where a plurality of jet passageways are exposed to the central passageway of the assembly.