First e-line horizontal fishing in Vaca Muerta
WELL TYPEHorizontal oil producer
MAX. DEVIATION90.46° @ 12,116 ft (3,693 m)
MAX. ACHIEVED DEPTH13,704 ft (4,177 m), fish depth
MAX. WELL DEPTH18,930 ft (5,770 m)
DISTANCE TRACTORED2,959 ft (902 m)
The operator needed to recover the BHA to continue with the fracking program. Because of the simultaneous operations on the five-well pad, fishing with traditional coiled tubing (CT) would require halting fracking operations on the other wells. Additionally, if the operator chose CT, they would lose valuable time waiting for CT availability, mobilization, and rig up/down. The operator desired an intervention that would aid in increasing pad efficiency despite this setback. Welltec® had previously performed successful plug recoveries for the operator and was asked to propose a solution for this fishing job along with possible contingencies.
For the first run, personnel estimated the target depth at 558 ft (170 m) based on the failed first run and on the assumption that the plug on the fish was activated. For this reason, only the Well Stroker and WRD were used. The toolstring descended to 2,461 ft (750 m) but did not locate the BHA.
For the second run, a Well Tractor® was added, so the toolstring could be conveyed throughout the high angle well. To keep the toolstring as short as possible to fit inside the lubricators, a two-wheel section of the 3-1/8” Well Tractor was used. The fish was located at 10,764 ft (3,281 m) at an 80° inclination. After several attempts to push the fish with the Well Tractor and latch it with the Well Stroker, the fish began to move. The Well Tractor pushed the fish to 11,460 ft (3,493 m) where it no longer went forward, possibly due to sand residues from previous fracking. The client next pumped a cleaning batch.
For the last run, a wheel section was added to increase the Well Tractor’s pull force after the client approved using part of the frac stack as a pocket if the BHA was recovered. The Well Tractor was activated at 10,745 ft (3,275 m) and pushed the BHA against a plug at casing collar locator depth of 13,704 ft (4,177 m). At this point, the Well Stroker was activated and stroked down to hook the fishing tool to the BHA. A tension test then confirmed that the BHA was attached.
Running this horizontal fishing operation on e-line reduced the rig-up/down time, left a smaller operational footprint, and provided quicker logistics than a traditional CT operation. Furthermore, simultaneous operations were performed and five fracking stages were completed during Welltec’s operation. Finally, despite two additional runs—due to the initial assumption that the toolstring was in the vertical section—this operation saved 24 hours when compared with CT.
This sets a positive precedent that will allow further flexibility in our contingency operations of PnP and will for sure trigger a change in our workflow.
The Well Tractor was regarded as a revolution in the industry when it was introduced in the 1990’s. It enables operators to extend the reach of traditional e-line deployment into highly deviated and horizontal wells.
The Well Stroker can push or pull multiple times in the same run irrespective of the depth and deviation. It delivers up to 100,000 lbs of axial force downhole using a bi-directional hydraulic ram.
Welltec Release Device (WRD®) is a simple tool which adds versatility and risk reduction to the operation. It provides predetermined locations in the toolstring where it can be parted, should it become stuck.
With the Welltec Swivel, the risk of unintentionally wrapping the wireline cable due to torque build up through the toolstring is eliminated.