Sand Control solution for Ormen Lange ERD-Wells

Abstract

An Extended Reach Drilling (ERD) well is planned for the Ormen Lange field in order to tap isolated reserves and maintain production. However Low fracture gradient, poorly consolidated formation and high fines content all act to compromise the current sand control design.

The aim of this study is to propose a recommendation for the sand-face completion type for the planned ERD well. To facilitate this, a number of new solutions and techniques were evaluated with a focus on well productivity, performance and the requirement for a 30year+ well life. Specifically the scope of this study covers:

Size of production liner and dimensions of sand screens based on torque and drag.

Fluid testing performed to evaluate the rheological properties and filter-cake dissolution capability of the carrier fluid.

Finally a production performance study was performed to recommend a final completion solution for the ERD-well based on production rates.

After careful consideration the shunt-tube system was selected for use in the planned ERD well. This system was found to best overcome the challenge of low fracture gradient, unconsolidated formation and high fines content. It provides a tight and complete gravel pack which limits movement of unconsolidated sand and gives good retention quality. A new carrier fluid was successfully developed with the required rheological properties and dissolution qualities. Based on production performance and a successful torque and drag analysis was the 9-5/8 in-liner selected.