Conveying OH pressure and sampling toolstring
Well typeHorizontal exploration well
Max. temperature142°F (61°C)
Max. pressure4,764 psi
They chose to convey the toolstring using a Well Tractor to save two days of rig time and the associated cost of using the alternative pipe conveyed system. Using spacers ensured that the Well Tractor would be inside the 9 5/8” casing shoe when located at the required measurement depth. This would prevent the tractor wheels cutting into and potentially getting stuck in the formation.
Both objectives were achieved. Welltec® also came up with an ingenious plan for fishing the toolstring in the case it would get stuck. A 3 5/8” tool adapter was installed at the top of the toolstring, just below the Welltec Release Device® (WRD). This would enable fishing of the entire toolstring by using the available fishing kit, which was suitable for the 3 5/8” tool OD only.
The toolstring was configured with two multi-sampler modules, two fluid analyzers, a dual pump out module for sample clean-out, a 1 gallon sample chamber and two powered caliper tools. It was conveyed by a Well Tractor 318 to collect the planned pressure measurements and samples from just outside the casing.
Excellent pre-job planning, support and execution by Welltec’s team in Angola were contributing factors to the success, which opens up more opportunities for Welltec globally.
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.