The Evolution of Khuff Completion

ABSTRACT This paper reviews the changes and improvements in the design of Khuff Well completions in Bahrain; functions of the components will be emphasized and their performance evaluated. In general, there have been three basic completion designs. Early wells have 5" liner Cemented across the Khuff zones with 5" tubing tied back from the liner to the surface. Subse quent wells were completed with 7" casing with a mechanical set seal bore packer and 5" tubing anchored to it. The latest group of wells are equipped with hydraulic set packers and the tubing is tied back through a floating seal assembly to allow for movement. All designs use various configurations of landing nipples below and above the liner or packer seal assembly. Early designs also utili zed a sliding side door sleeve (circulating device) above the seal assembly. The later designs incorporate a landing nipple below a perforated pup in the tail section for flowing bottom hole pressure measurements.