Oriented Perforation using Tubing Conveyed Perforating TCP Gun with Dynamic Underbalance DUB as Sand Control Method in Low Angle Wells, Offshore Sarawak, Malaysia.

摘要

The use of oriented perforation as a means of sand control technique has been adopted by many operators in industry. Two low angle wells completed in D field offshore Sarawak, Malaysia with moderate to weak rock strength quality required this method not only to limit the sand production but also to sustain the minimum production of 2500bopd each. Based on onset sand production analysis, reservoir M is predicted to have sand production in the direction of a maximum stress of 135degrees from true north. The wells then are suggested to be shot 0-180degree parallel to maximum stress and it saved the expense of no installation of downhole sand exclusion. This paper outlines the perforation analysis conducted to design the optimum perforation using Tubing Conveyed Perforating (TCP) Gun with Dynamic Underbalance (DUB) that effectively clean the newly created perforations. The operational approach applied to overcome the challenge of achieving desired orientation in almost vertical deviation wells by positioning electronic gyroscope siting on Universal Bottom Hole Orientation (UBHO) sub is also discussed in this paper. The available centralization solutions in market are limited to 30° degrees well inclination with 5°accuracies at three times more cost than conventional TCP. The proposal of oriented perforation at both slanted wells significantly saved lot of project economic and proved as effective sand control method, so far the production target is achieved and maintained with no record of sand production at field.