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8/10/2019 D6B1004401-MKT-001
http://slidepdf.com/reader/full/d6b1004401-mkt-001 1/6
GPDS®
Grant Prideco® Double Shoulder® Connection
8/10/2019 D6B1004401-MKT-001
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T
he NOV® Grant Prideco GPDS® connection
provides enhanced performance without
requiring special running and handling
procedures. Make-up characteristics of the
GPDS connection are similar to that of API
connections. Both connections spin-up freely
from the stab to hand-tight posit ion. In the
hand-tight posit ion, the external shoulder
makes contact. This shoulder is the primary
seal for the connect ion just as on an API
connection.
As the connect ion is made-up f rom the hand-
tight to power-tight posi tion, the box
counterbore compresses, the pin base
elongates elastically and the internal secondary
torque shoulder engages. The secondary torque
shoulder allows for enhanced load distribution
across the th readed region and provides
increased torsional capacity when compared to
standard API rotary shouldered connections.
Since the secondary shoulder functions solely
as a torque stop and not a pressure seal, minor
damage to the shoulder can be tolerated without
adversely affecting connection performance.
• Enhanced torque capacit y compared to API
• More OD wear befor e downgrading
• Interchangeable with API
• Improved hydraulic effici ency
• Flush ID connect ion
Primary
torque
shoulder and
seal surface
Secondary
torque
shoulder
True flush ID
through the
connection
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T
he NOV Grant Prideco Double Shoulder (GPDS)
connection is a high-performance, rotary shouldered
tool joint connection available for dr ill pipe ranging in size
from 2-3/8 to 6-5/8 inches. GPDS offers a versatile alternative
to standard API connection designs when higher torsional
strength and tool joint wear is desired. GPDS is fully
interchangeable with corresponding API
FH or NC counterparts. GPDS is a proven
connection that provides increased
torsional capacity, promotes more
streamlined confi gurations and tolerates
more tool joint wear than standard API
rotary shouldered connections.
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rmance, Interchangeable with APIINTERCHANGEABILITY
NOV Grant Prideco’sGPDS connection is s imilar to
API connec tions, excep t that
the GPDS incorporates an
internal secondary torque
shoulder. The GPDS
connection has the same
thread form and is
interchangeable with its API counterpart
connection as shown in the illustration above.
Note how the GPDS pin secondary to rque
shoulder runs out without shouldering in the
back of the API box connection.
“ Interchangeability” means that the
connections w ill mate together, make-up and
function; however, the performance properties
will be limi ted to that of the API connection. For
example, a GPDS38 is interchangeable
wit h NC38, and a GPDS55 is
interchangeable with the 5-1/2 FH, but
when mated together the NC and FH
limit the connection performance
properties respect ively. The table to
the righ t identi fies the GPDS
connections and their interchangeable
API connec tion types.
SLIM PROFILE
The GPDS connection’s increased tors ionalstrength allows for tool joint dimensional
optimization more suitable for the pipe body
torsional strength. GPDS connections can be
conf igured with a smaller OD and larger ID
compared to standard API connections wi thout
sacrificing torsional capacity. This feature allows a
larger diameter drill pipe to be used for improved
hydraulic performance. The GPDS double-
shoulder design also provides a true flush inside
diameter through the mated tool joint assembly.
There is no gap or change in the inside diameter
from the box to t he pin, creating a smoother fluid
flow wit h less turbulence, in addition to eliminating
the opportunit y for trapped cement and cuttings.
GPDS26
GPDS31
GPDS38
GPDS40
GPDS46
GPDS50
GPDS55
GPDS65
NC26
NC31
NC38
NC40
NC46
NC50
5-1/2 FH
6-5/8 FH
Interchangeabi l i ty Table
GPDS MECHANICAL CHARACTERISTICS
GPDS Pin and API box
Visit www.nov.com/grantpr ideco
and click on this icon to connect to
us 24/7. Your feedback is valued and
important to us!
Questions
Questions?
Need assistanceNeed assistance?
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