Method of cutting high strength materials with water soluble abr

Details Method of cutting high strength materials with water soluble abr Method of cutting high strength materials with water soluble abr

1993-11-12

1994-11-22

Dang, Hoang C.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

175 67, E21B 43114

Patent

active

053660153

ABSTRACT:
Method of forming openings in structural substrates, especially oil and gas well casings, by providing a supply of a preselected liquid and providing a supply of preselected abrasive particles which are soluble in the liquid. The liquid and abrasive particles are combined to form an abrasive particle laden saturated solution having a predetermined concentration ratio exceeding the saturation point of the base liquid. The abrasive particle laden saturated solution is then pressurized to a predetermined delivery pressure and is routed to at least one jetting nozzle capable of expelling the abrasive particle laden saturated solution. The substrate, in which an opening is to be formed, is subjected to a directed expulsion of the abrasive particle laden saturated solution at a distance and for a period of time necessary to form an opening therethrough. Such abrasive particle laden saturated solution used and needed to form the opening is then considered to be residual. Preferably the method further includes diluting the residual abrasive particle laden saturated solution with the original liquid, or alternatively, a second liquid such as an acid, to transform the residual solution into having essentially a zero concentration of soluble abrasive particles therein. Alternatively, an unsaturated solution of soluble abrasive particles may be substituted for the saturated solution, and introduced before or after the liquid passes through the jetting nozzle, provided the hydraulic jetting is performed prior to the particles dissolving within the preselected liquid.

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