In June 2018, a West-Texas operator attempted a logging survey to identify a restriction in the production casing of a producer at approximately 18,200 ft. The restriction had already prevented the operator from pumping down a plug and perforating gun combo in an extreme 23,600 ft lateral on a multistage frac operation.
A 3.74” OD gauge run on 2-3/8” CT was then obstructed at 18,266 ft with a subsequent 3” gauge run finally passing the restriction. The operator then opted for a downhole video camera and a multi-finger caliper tool to establish the cause of the restriction. The manufacturer of the downhole camera recommended pairing the camera and caliper tool with an e-line tractor to avoid several potential CT complications:
- CT struggles with extreme laterals and often stops because of helical buckling.
- CT requires friction reducers that hinders video quality because of darkened well fluid.
- CT has no power source, so the downhole camera must operate in memory mode and cannot provide a live video feed
Conveying the camera and calipers with an e-line tractor resolves all such issues, especially enabling surface personnel to view a live video feed and make instant decisions based on both quantitative caliper data and qualitative visual interpretation of the ID of the well.