FLUID SHOCK WAVE OSCILLATOR AND FLUIDIC PUMP

1,260,765. Hydraulic pressure wave generating apparatus. Momentum pumping apparatus. BAKER OIL TOOLS Inc. Nov.11, 1969 [March 26, 1969], No.55059/69. Headings F1P and F1R. Apparatus for intermittently and suddenly arresting a moving liquid to create pressure waves capable of doing useful work e.g., pumping well-liquid or further pressurizing a liquid comprises two shock tubes 21, 22 Fig. 1 connected at their upper open ends to a reservoir 24 and having at their lower open ends ports 27, 28 controlled by a shuttle valve 29 and through which ports liquid from a power supply line 25, 26 is passed whereby when valve 29 closes ports 27, 28 alternately a negative pressure developes in shock tubes 21, 22 which results in alternate opening of further shuttle valves 17, 18 to admit well-liquid through inlet ports 15, 16 at the lower ends of tubes 21, 22. Each valve 17, 18 remains open until the negative pressure wave returns thereto at which time pressure in tubes 21, 22 equals the external pressure and valve 29 reopens and then recloses to initiate a further cycle. The second shock tube 22 and port 16 and valve 18 enables well-liquid to be pumped whilst the first shock tube is inactive. Power liquid for tube 25, 26 is provided by a well head pump 12. In a modification and for the production of a positive pressure in shock tubes 21a, 22a Fig.10 the closing of end port 60 by a valve 65 results in opening of a valve 17a and discharge of pressurized liquid through a port 15a into a line 63 during which time liquid flows from tube 22a through an open valve 66 connected to 65 by a rod 68 and through port 60 into a low-pressure exhaust line 61.