CT real-time perforating service
Ensure target zone coverage with selective perforating, and achieve accurate depth control in a single run.
An offshore well within the Republic of the Congo was completed with an ESP bypass system and was producing water. There was a small window of suitable tubing in which to set a 2 1/8-in CoilFLATE packer below the depth of the production packer and subsequently cut the tubing in between both.
During this operation, the operator needed to achieve two objectives:
Schlumberger proposed ACTive family of live downhole coiled tubing services to maximize efficiency and prepare the well for plug and abandonment. The ACTive PTC live CT pressure, temperature, and casing collar locator tool provided depth setting of the packer and correlated the depth accurately for the PowerCutter tubular cutter. ACTive Isolation live CT zonal isolation service enabled reliable inflation setting of the packer using internal and external pressure gauges. ACTive Perf live CT perforating service was used to monitor the depth correlation of the PowerCutter tubular cutter and its activation was confirmed by monitoring the loss of the tool weight upon firing using the ACTive TC tool.
The following sequence of events occurred in the first phase:
The following sequence of events occurred in the second phase:
The ability to run two different services in the same sequence and real-time monitoring of downhole measurement data ensured the accuracy and success of the operation. ACTive services provided a nondisputable advantage by monitoring all downhole parameters in real time to reliably activate the firing head. The CCL depth correlation enabled accurate CoilFLATE packer positioning, accurate depth positioning, and activation of the PowerCutter tubular cutter.
Challenge: Prepare the well for P&A by cutting the upper production tubing and placing a cement retainer plug over the lower completion to be subsequently cemented and sidetracked.
Solution: Deploy CoilFLATE coiled tubing through-tubing inflatable packer and PowerCutter precision tubular cutter on CT to maximize efficiency and prepare well for P&A.
Results: Saved time and costs with no NPT or lost time during intervention by running the CoilFLATE packer and PowerCutter tubular cutter on the same CT intervention.