Patent ID: 6015010
Filing Date: 2000-01-18
Classification: E21B,G01V

Abstract:
Apparatus for producing a shock wave in liquid in a borehole, comprising:(a) a tubing string extending into the borehole;(b) a cylinder assembly connected with the tubing string, said cylinder assembly containing an elongated internal chamber having an upper bore and a lower bore, said upper bore having a cross-sectional area which is less than the cross-sectional area of the lower bore;(c) means for positioning said cylinder assembly such that said cylinder assembly is submerged in liquid in the borehole and said internal chamber is filled with liquid;(d) a plunger assembly including a seal engaging said upper bore and a lower plunger movably arranged within said lower bore and into said internal chamber for compressing a portion of the liquid contained within said internal chamber and discharging the liquid into the borehole when said plunger moves through said lower bore into said internal chamber; and(e) pumping means connected with said plunger assembly for displacing said plunger assembly within said cylinder assembly.