11 STAGE THROUGH PATCH TRACTORING WITH ZERO NPT

Well Tractor for CONVEYANCE SOLUTIONS

Background

After successfully conveying calipers and logging tools in the Eagle Ford Shale, Welltec’s tractors were requested to remain on standby on location in case they would be needed again. That turned out to be a good plan. The operator experienced some off depth perforations and had to set a patch in the horizontal section to isolate them. However, while attempting the subsequent, lower stage perforation the operator was not able to pump the plug and guns through the patch, which had an ID of 3.6”. On the first attempt, the plug set prematurely when attempting to pump through. With the frac crew on location time was a costly factor to consider when planning how to finish the remaining 11 stages. After CT had drilled out the prematurely set plug, Welltec’s e-line tractors were selected over CT as the efficient, expedient solution. The Well Tractor® XR DC 318 was planned for the remaining 11 stages through the patch to prevent setting the plug off depth. Since Welltec® already had a crew on location they were able to respond to the operator’s needs in less than an hour and thereby minimize the frac crew costs.

OPERATION

Between the tractor+perf+plug runs Welltec’s engineers focused on maintaining efficiency. They checked the tools and completed all pre-run tests to ensure reliability and had the toolstring loaded and ready in the lubricator for immediate deployment when the frac finished.

A key feature of the Well Tractor was that it provided a controlled descent and speed through the patch while also centering the toolstring. This helped to prevent the plug from hanging up on the runs.

When running in hole the Well Tractor used gravity and pumping to descend to a depth of ~150 ft above the patch. From
there the Well Tractor conveyed the plug and guns through the patch. Once successfully through, the toolstring was umped the last way down to finish the run.

ACHIEVEMENTS

In total, Welltec conducted 11 runs in 37 hours of well time with no misruns or non-productive time. The operation demonstrated Welltec’s ability to handle downhole challenges in a speedy manner while increasing safety and service quality. Only a crew of two engineers was needed on location and the frac crew did not have to move any equipment to accommodate Welltec’s e-line unit. Safety during the operation was also ensured through the use of Welltec’s safe subs and electronic barriers. The e-line solution saved the operator several days compared to deployment on coiled tubing and provided tremendous cost savings through the gained e-line efficiencies.

WELL TYPE: OIL PRODUCER
MAX. TEMPERATURE: 315° F
LATERAL SECTION: 5,500 FT
MAX. DEPTH: 19,387 FT
MAX. DEVIATION: 89°
MAX. PRESSURE: 8,000 PSI
DISTANCE TRACTORED: 6,943 FT FOR ALL 11 STAGES

 

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IN TOTAL, WELLTEC CONDUCTED 11 RUNS IN 37 HOURS OF WELL TIME WITH NO
MISRUNS OR NON-PRODUCTIVE TIME.