After a series of time-consuming coiled tubing (CT) operations to mill out conventional composite plugs from Permian Basin wells, an independent operator needed a more efficient way to complete multistage wells and limit or eliminate milling risks. With milling and cleanout operations taking as long as 70 hours per well, the operator needed to significantly reduce the cost and time consumed by CT milling and cleanout operations and accelerate time to production.
The operator initially used another manufacturer’s composite plugs or dissolvable plugs but wanted to use more dissolvable plugs to facilitate removal of any preset plugs and improve access to lower perforations in the event of a screenout. After changing to dissolvable-only completions, the operator wanted to bundle the cost of postfracturing CT drillout and cleanout operations. However, the operator’s prior CT vendor was unwilling to bundle the jobs because of limited experience with dissolvable technology.
SLB recommended using ReacXion Complete (TM) fully dissolvable frac plugs with a bundled CT cleanout operation. ReacXion Complete plugs isolate zones for multistage stimulation and then dissolve to minimize postfrac operations. For these wells, the freshwater, ball-drop variant was chosen because it most ideally matched the downhole fluids (<5,000-ppm chlorides) and temperature (155 degF).
Based on historical experience with the ReacXion Complete plugs, SLB offered a package with the plugs and low-cost-per-stage CT cleanout services, which eliminated risks of unexpected costs related to reopening the well for production.
The operator installed 344 ReacXion Complete plugs in five wells. All of the subsequent hydraulic fracturing operations were completed without incident or isolation concerns. Plugs then remained in the well after fracturing for as little as 3 days before the CT cleanouts began. Based on the cleanouts, engineers determined that 330 plugs (96%) completely dissolved. Average milling time for the remaining plugs was 2.92 minutes per plug, and all but one well was cleaned out in a single run. The average cleanout time was 39 hours.
In all, the average CT operation time was reduced by 31 hours (44%) as compared with the third-party completion solution, saving 155 hours—more than 6 days—for all five wells.
