DRAG CALCULATIONS IMPROVE EFFICIENCY OF HYDRAULIC JARS

Thor Viggo Aarrestad Statoil Stavanger Using drag calculations helps accurately determine the maximum hook load for optimal over-pull force during jarring operations. The driller then has a better chance of freeing stuck pipe on the first jarring attempt. Several operational situations demonstrate how these calculations allow the over-pull force on the jar during operation to be increased by 40% compared to calculations involving the weight of the drillstring only. The drag calculation method

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