GB1417470A - Wash apparatus - Google Patents

Abstract

1417470 Wells &c McEVOY OILFIELD EQUIPMENT CO 16 Aug 1973 [1 Sept 1972] 38783/73 Heading E1F In wash apparatus for controlling the passage of washing fluids between the flowbore and surrounding annulus of a casing following cementing, there is provided a lower tubular member 30 for suspending a casing string 22 in a well, an upper tubular member 40 rotatably mounted within the lower member 30 and adapted for connection to a casing extension or riser 21, a fluid passageway 112 in the lower member for effecting communication between an annular space between the upper and lower members and a surrounding annulus 28, and sealing means within the annular space, the arrangement being such that rotation of the upper member in one direction relative to the the lower member brings the flowbore into communication with the annulus 28 via the annular space and passageway 112, and further rotation of the upper member in the same direction terminates such communication. In a first embodiment (Figs. 3 to 5 not shown) the upper member 40 is axially displaced during rotation and is provided with circumferentially spaced ports (114) which are brought into registration with ports 112 in the lower member to provide the communication. A compression seal (140) seals off the ports (114) following further rotation and axial displacement of the upper member 40. In an alternative embodiment (Figs. 6 to 8 not shown) the upper member (230) is prevented from axial displacement and threadably engages a valve sleeve (210) which is prevented from rotating. Rotation of the upper member axially displaces the sleeve into the communicating position wherein fluid flows through the open end of the upper member (230), and then into the non-communicating position wherein this fluid flow is blocked by a compression seal (320) carried at the lower end of the valve sleeve (210).