RIGLESS RETRIEVAL OF STUCK LOGGING STRING

Well Stroker for mechanical services

Background

An operator of a production platform offshore Trinidad was faced with the challenge of removing a stuck tool. A third party tractor and production logging string was stuck in a section of the well in which the ID had changed drastically. It was critical that the fishing operation be done without the use of a rig or coiled tubing unit.

OPERATION

A 3 1/8” Well Tractor®, Well Stroker®, Welltec Release Device® (WRD) and a grapple overshot were called out. The toolstring was rigged up and ran into the well to a depth of 9,500 ft (2,895 m) MD. The Well Tractor conveyed the toolstring down to 10,200 ft (3,109 m) MD where the fish was located.

At this point the overshot was tractored onto the fishing neck of the stuck tractor and logging string, and the Well Stroker was engaged. Using the Well Stroker’s extendable, hydraulic arm with the ability to push or pull over 20,000 lbs of force, the fish was caught and pulled.

Tension readings from the surface indicated the fish was loose and the toolstring began to be pulled out of the hole. Approx. 1000 ft (330 m) from surface, the toolstring became wedged in the Sub Surface Safety Valve (SSSV). The Well Stroker was activated again to stroke through the SSSV and successfully pulled the jammed toolstring through without any damage. The fish was then recovered to surface.

ACHIEVEMENTS

As Welltec® was able to quickly remove the fish from the well, the operator saved coiled tubing and rig costs, as well as deferred and lost in hole costs for the recovered tools. Production was returned to the levels seen before the fish became stuck.

The total operating time was 16:45 hours, with a conveyance time around 27 minutes. The operator concluded that Welltec’s e-line technologies provide a much more efficient way of fishing in tubing than conventional methods, as they, due to their lightweight nature, take significantly less time to mobilize and deploy onto a drilling rig. As well, Welltec’s fishing solution requires less people and therefore delivers a more positive HSE impact to operations.

The operator concluded that Welltec’s e-line technologies provide a much more efficient way of fishing in tubing than conventional methods, as they, due to their lightweight nature, take significantly less time to mobilize and deploy onto a drilling rig.