Conventional service tools utilized to stimulate and frac pack typically isolate the above annulus when hoisted from treating to reverse position or the treatment excesses have to be reversed out against formation, creating issues in certain formations in the GoM. Operators have elected to utilize service tools without the isolation feature to treat formations where cross-flow is suspect. This treatment requires careful job planning to control media loading to prevent excessive slurries remaining in the work string. This paper addresses some of the issues associated with cross-flow by utilizing a service tool that maintains hydrostatic on the formation from deployment until reversing out after media placement. The service tool system provides complete hydrostatic at all times by using well synchronized valves and is completely anti-swabbing to the formation during the tool positioning manipulation. The unique service tool design utilizes a restrictor which is bypassed when the service tool is in treating position providing true full open communication (live annulus). Hydrostatic communication is restricted to limit swabbing while controlling losses when it becomes necessary to reverse prior to media placement. Reverse position is repeatable and selected downhole allowing the operator to reverse against the formation, a predetermined restrictor or to bi-directionally isolate the formation.

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