11 stage through patch tractoring with zero NPT3
Well typeOil producer
Lateral section5,500 ft
Max. depth19,387 ft
Max. pressure8,000 psi
Distance tractored6,943 ft for all 11 stages
The operator experienced a casing issue due to off depth perforations and had to set a patch in the horizontal to isolate them. However, while attempting the 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 frac on location it would be a costly endeavor to continue the 11 stages on Coiled Tubing (CT) and the operator wanted a time-efficient solution.
After CT had drilled out the prematurely set plug, Welltec’s e-line solution was therefore chosen over pump down operations that had taken 11 hours already. Thus, the Well Tractor® XR DC 318 was planned for all 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 ensure that the operation stayed on schedule.
A key feature of the Well Tractor was that it provided a controlled descent and speed through the patch while also centering the toolstring, which prevented the plug from hanging up again. When running in hole the Well Tractor used gravity to get to around 75° and started pumping down to 150 ft above the patch.
Then the Well Tractor was used to successfully convey the plug and guns through the patch. The Well Tractor was deactivated 150 ft past the bottom of the patch and from that point the operator continued with normal pump down operations.
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 frac did not have to move any equipment to accommodate for Welltec’s e-line unit.
Safety during perforations was also increased compared to any other service offering because of Welltec’s safe subs and electronic barriers.
The e-line solution saved the operator several days and provided tremendous cost savings.
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.