El Cabalo De Troya

3. Well Bore Geometry

If it is established that the sticking is due to well bore geometry or mechanical causes then continue to circulate the hole. If sticking occurred while moving up then applytorque and jar down. If sticking occurred while moving down then DO NOT APPLY TORQUE and jar up. Jarring operations conventionally start with a relatively light loading at first building up to maximumloading after approximately one hour (assuming the string is still stuck).

When jarring down or cocking the jars to fire up, reduce the pump pressure. This results in a more effective down blow.When jarring up pump pressure aids the blow so full circulation is recommended.

Jarring may be necessary for a long period of time before the string is freed or an alternative decision is made. Ifthe problem is in a Carbonate then consider spotting acid. If it is in Salt then consider pumping fresh water.

Once free continue circulating at full rate, working and rotating the string andream/backream the section thoroughly.

If more information is available then more specific actions can be taken in order to try and remedy the situation.

If severe dog legs exist in the hole, it may bethat Key Seating is occurring caused by the pipe rotating against the same point of the bore hole wall and wearing a groove or key seat into the wall at that point. As such when the string is pulledout of the hole the tool joints or any other larger OD items will get jammed in the key seat. Getting stuck like this only occurs while pulling out of hole, as such in order to get free, apply torqueand jar down.

After coring or running a new bit after the previous bit was graded to be undergauge, resistance may be encountered during the trip in hole as the new in gauge tools encounter theundergauge hole. If the run in hole proceeds too quickly without reaming etc. the new bit can jam in the undergauge hole. If this happens, maintain full circulation and jar up. Do apply torque and do...