CT used to clean sand from a low-BHP, large casing deepwater well ///

One of the most challenging coiled tubing (CT) operations is the inside cleaning of large-diameter casing at a low bottomhole pressure. In the West Seno field, offshore Indonesia, this type of work is basic with regards to recovering production, which is mostly from sanded-up and depleted horizontal wells. Deep wells and limited capacity of the tension leg platform (TLP) prohibit the use of large-sized CT, and this fact adds to the job’s complexity. However, with the integration of several methods, such as the special rotating jetting system, real-time fiber-optic downhole (DH) telemetry system, gas-lift injection technique and a new clean-out, shear-thinning, oil-based gel fluid that has superior suspension ability, work that was almost impossible before is now viable.

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