E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/29
E21B 31/113 (2006.01)
Patent
CA 1160212
ABSTRACT OF THE INVENTION A hydraulic well jar of the type having a longitudi- nally slidable inner mandrel within an outer case, the inner mandrel having a hammer element thereon which im- pacts on an anvil element in the case. Hydraulic fluid is disposed between the case and mandrel. Initial movement of the mandrel with respect to the case is impeded by a hydrau- lic fluid metering jet mechanism, which is bypassed as the mandrel reaches a predetermined point in its travel, al- lowing a sudden, more rapid movement of the mandrel, there- by generating a greater impact force. The present invention comprises an improved fluid bypass design, as well as an improved mounting system for the hydraulic fluid screen and jet of the metering mechanism. An improved seal arrangement between the metering mechanism, which is attached to the mandrel and the interior of the outer case provides greater seal life and better performance for the jar.
385130
Company Halliburton
Swabey Ogilvy Renault
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