Select Function Circulation Tools

INQUIRY PDF Format

Description

Select Function Circulation Tools (SFCT)

Application

Select Function Circulation Tools has been developed for use in wells
where high circulation rates are required at various times to displace solids out of the hole. It allows
flow rates to be boosted at a liner top to increase the annular velocity of the well bore fluid, thereby
increasing the cleaning action. It also allows the spotting of chemical pills and the change-out of well
bore fluids to be carried out very efficiently. The tool is particularly suited to wells with small liner
diameters in which well clean-up operations are performed prior to running completions or test strings.
The tool can be run when drilling cement and milling/polishing liner top PBRs.
The tool does not require darts or balls to be pumped down the drill pipe and can be operated in the
hole as many times as required by simply slacking off or picking up the string

The tool is operated in a similar fashion to a bumper sub used during drilling. It has a stroke length of
15 inches. Running in the hole the tool is fully stroked out and any circulation goes through the end of
the drill string. Rotating torque is transmitted to the whole drill string. The tool has a shear ring
installed (7,000 lbs (standard) or 15,000 lbs in the 3.1/2” IF tool and 20,000 lbs (standard), 7,000 lbs,
40,000 lbs or 60,000 lbs in the 4.1/2” IF tool) to prevent premature opening whilst running in hole or
drilling.
The SFCT is run with a suitable “no-go” device (liner top dressing mill, bearing sub or stabiliser)
below it so that it can be operated without putting the lower string in compression. When this device
lands on the liner top and the required weight is slacked off, the outer sleeve moves down opening the
fluid bypass channel. The tool is now open and high circulating rates can be achieved through the
circulating ports.

JERRY Jerry@kwoil.cn WHATSAPP +0086 15102935475