Hydra-Jar AP Jar Successfully Frees Packed-Off Drillstring, Onshore Mexico | Schlumberger
Tech Report
Location
Mexico, North America
Details

Environment
Land

Toolsize, in
8

Flow rate, galUS/min [L/s]
700 [44.16]

Pressure, psi [MPa]
3,000 [20.68]

Torque, ft.lbf [N.m]
5,500 [7,457]

Mud weight, lbm/galUS [g/cm3]
10.9 [1.3]

Firing duration, h
16.5

Weight on bit, t [kg]
4–5 [3,629–4,536]

Depth of stuck pipe incident, ft [m]
6,348 [1,935]

Depth in, ft [m]
7,238 [2,206]

Depth out, ft [m]
9,170 [2,795]

Background
While drilling the 12 1/4-in hole section, a jar was added to the BHA should the drillstring become stuck. Schlumberger recommended a Hydra-Jar AP double-acting hydraulic drilling jar, which is balanced to hydrostatic pressure through ports open to the wellbore, ensuring consistent hitting performance regardless of downhole pressure changes.
Products Used

Hydra-Jar AP Jar Successfully Frees Packed-Off Drillstring, Onshore Mexico

The jar was fired 568 times with no loss of hitting force, avoiding the need for fishing and saving USD 430,000

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The Hydra-Jar AP jar’s unique metering process compensates for decreases in detent cylinder oil viscosity to sustain the jar’s hitting force, even after repeated firings.
Products Used

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