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You are here: NOV.com > Solutions > Tubular and Corrosion Control > Drilling Tubulars > Rotary Shoulder Connections
eXtreme Torque (XT®) Connections
eXtreme Torque (XT®) connections
Rotary Shoulder Connections

The NOV Grant Prideco eXtreme™ torque (XT) connection is a patented, high-performance, rotary shouldered connection available in sizes from 2 3/8" to 6 5/8". The eXtreme torque connection incorporates a second-generation double-shouldered design.

Body Images

A secondary internal shoulder on the nose of the pin offers an additional friction surface and mechanical stop. The primary external shoulder still serves as the connection's sealing surface. As shown in the figure, the eXtreme Torque design has an extended pin base, pin nose, and box counterbore. These sections are carefully engineered to provide additional elastic deformation during make-up. This ensures that the contact forces are properly proportioned between the two shoulder surfaces.

The eXtreme Torque connection meets the requirements of the most extreme drilling applications: extended reach drilling (ERD), horizontal drilling, deep water, high temperature-high pressure (HTHP) and ultra-deep wells.

User-friendly Tool Joint - The XT is a conventional shoulder and thread connection. The XT spins up freely until shouldered, then is bucked up to the make-up torque. Make-up, running and break-out speeds of XT are similar to API connections.

High Torsional Limit - The XT connection offers significantly higher torsional capacity than standard API and NOV Grant Prideco's HI TORQUE® connections. This additional strength provides the required torque for the most extreme drilling applications.

Slim Profile - The XT's increased torsional strength allows for the use of a streamlined tool joint that is suitable for the pipe's torsional strength. XT connections can be configured with a smaller OD and larger ID compared to standard API connections without sacrificing torsional capacity. This allows a larger diameter drill pipe to be used for improved hydraulic performance.

True Flush Inside Diameter - There is no gap or change in the inside diameter from the box to the pin, creating a smoother flow with less turbulence. This also eliminates the recess in other connections where cement and solids can be trapped.

Rugged Durability - The robust XT design incorporates more steel in the critical areas of the connection resulting in less refacing and fewer recuts. In addition, because of the increased torional capacity, the XT connection greatly extends the life of the joint by tolerating more OD wear.

Field Repairable - The XT can be refaced in an inspection yard or at the rig site with a portable refacing tool. This can save time and expenses by eliminating shipping and handling costs.

XT Mechanical Characteristics

Body Images

Conn-
ection
 

 

OD (in.)

ID (in.)

Tensile Yield (lbs)

Torsional Yield

(ft-lbs)

Max. Make-Up

Torque

(ft-lbs)

XT26

3 1/2

1 3/4

326,900

13,700

8,200

XT31

4

2 5/32

402,500

17,800

10,700

XT38

4 3/4

2 9/16

599,600

31,500

18,900

XT39

5

2 9/16

726,100

40,700

24,400

XT40

5 1/4

2 13/16

751,600

44,100

26,500

XT46

6 1/4

3 1/4

1,045,600

71,800

43,100

XT50

6 5/8

3 1/2

1,256,300

90,700

54,400

XT54

6 3/4

4

1,155,100

88,700

53,200

XT55

7

4

1,272,600

96,900

58,100

XT57

7

4 1/4

1,208,700

94,300

56,600

XT65

8

5

1,543,700

135,300

81,200

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