Introduction

        Fill and Circulate Tool (hereafter referred to as FAC Tool) is a surface tool used during the casing running operation. The FAC Tool is designed to both fill the casing with drilling fluid while running it in the hole and to enable quick circulation of the casing string at any time without installation of a casing swage. The FAC Tool has features with easy –to- use , safe and reliable , no leakage and so on, which lightens labor intensity of workers greatly and improves operation environment of well.