Hydra-Jar AP Jar Frees Stuck Drillstring, Onshore Mexico | SLB
Tech Report
Location
Mexico, North America, Onshore
Details

Environment
Land

Toolsize, in
8

Hole size, in
12 1/4

Average flow rate, galUS/min [L/s]
704 [44.42]

Average pressure, psi [MPa]
3,212 [22.15]

Torque, ft.lbf [N.m]
5,314 [7,205]

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

Approximate firing duration, h
50

Weight on bit, t [kg]
3–12
[2,722–10,886]

Depth in, ft [m]
2,625 [800]50

Depth out, ft [m]
6,562 [2,000]

Background
For the 12 1/4-in hole section, a drilling 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 Frees Stuck Drillstring, Onshore Mexico

Jar maintained hitting force after being fired 1,723 times, avoiding costly fishing measures and saving rig time

The Hydra-Jar AP jar freed stuck pipe successfully with a fring duration of approximately 50 hours, saving the operator valuable rig time.
For the 12 1/4-in hole section, a drilling 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

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