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

Published: 07/29/2015

Concrete blue texture
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.
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.
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