E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 31/113 (2006.01) F16F 9/512 (2006.01) F16F 9/516 (2006.01)
Patent
CA 2161331
A reduced waiting time drilling jar (1) includes a mandrel (2), a housing (3) telescopingly positioned about the mandrel (2), and first and second pistons (89, 111) positioned axially between the mandrel (2) and the housing (3). The pistons (89, 111) are spaced longitudinally apart, forming a substantially sealed chamber (88) therebetween. The first piston 89 has a first and second substantially parallel flow passage (94, 200) formed therein and extending longitudinally therethrough to provide first and second flow characteristics. A valve (204) is hydraulically connected to the second flow passage (200). The valve (204) is translatable between first and second operating positions, wherein fluid flows relatively freely through the second flow passage (200) in the first operating position, but is restricted in the second operating position. A pressure relief valve (206) is hydraulically coupled to the substantially sealed chamber (88), and mechanically coupled to the valve (204), wherein movement of the pressure relief valve (206) biases the valve (204) between its first and second operating positions in response to the pressure in the chamber (88) rising above a preselected value.
Dailey Petroleum Services Corporation
Finlayson & Singlehurst
Weatherford/lamb Inc.
LandOfFree
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