Home > WELL BORE CLEAN TOOLS > Dual Action by-Pass Tools

Action By-Pass valve

offers a wide variety of Circulating tools—from liner top test tools and casing cleaning tools to ancillary and customized tools—and filtration services to protect and preserve fluids quality.

INQUIRY PDF Format

Description

Ported By-Pass Sub is designed to be run in a clean-up string where it is desirable
to open up communication between the ID of the drill pipe and the annulus when POOH.It is normally run above the Well supervise to provide an additional means of
equalising pressure and fluid flow around the tool should it become full of debris when POOH. When run with the   Well supervise it is run as a contingency device and is only

opened if required.
Unlike conventional single ball drop subs, the   Ported By-Pass Sub allows fluid in thedrill pipe above the tool to drain past the ball when the ports are open.
Other applications for the tool include being run as a drill pipe drain sub and being run in conjunction with a Single Action By-Pass valve (SABV) to provide an additional
circulation path down hole after the SABS has been closed.
KW do not recommend the use of the PBS for the application of flexing the drill
pipe. Consideration could be given to flexing the pipe externally instead of internally whena suitable internal flexing device is not available.

OperationThe tool is RIH in the closed position and, when required, a ball is dropped to open up the ports. If desired, fluid can be pumped both through the ports and down through the tool.When POOH, the tool is in the open position.

Operational Parameters
To ensure that the KW circulation  By-Pass Sub operates correctly, it is important that pump rates are not excessive when landing the opening Ball on the internal ball seat. The maximum recommended rates, together with the shear pressures to open the ports, are shown in the Table below

One-piece, full-strength mandrel
Two sets of ports and two internal ball seats that can be moved to open-close ports
Available in 4 3/4- and 6 1/2-in ODs
Also available as 11- and 16-in jetting tools
Advantages
Used to jet BOPs and risers
Can be used to bypass drilling motors
Can be run above small, nondraining pipe