Heavy Weight Drill Pipe Specs & Selection

Heavy Weight Drill Pipe Specs is important to understand as it is the entrance of the heavy weight drill pipe design. In this article, we will discuss its specs and how to select in the drill string design. In addition to that, we will talk about its main functions. you can also download the specs sheets from any size of heavy weight drill pipes.

Heavy Weight Drill Pipes Definition

In the past, the two main components of the Drill String consisted of the Drill Pipe and the Drill Collars. The point where the relatively small OD and flexible Drill Pipe connects to the large stiff Drill Collars is called the Transition Zone. Oilfield studies have shown that almost all of the Drill Pipe fatigue failures are the result of an accumulation of fatigue damage occurring when the Drill Pipe joints were run in the Transition Zone or were stressed above the endurance limit in crooked holes. Downhole data has indicated that the large change in diameter at the transition zone caused accelerated fatigue damage as a result of the concentration of cyclic bending stress reversals in the bottom joints of the flexible Drill Pipe since the stiff Drill Collars bend very little from these stress reversals. So heavy weight drill pipe specs definition will be a drill pipes with higher thickness to withstand the stress in the transition zone.

HWDP Function

Before starting ti talk about heavy weight drill pipe specs, let’s understand its function. Heavy weight drill pipe is used to absorb the stresses being transferred from the stiff Drill Collars to the relatively flexible Drill Pipe. The major HWDP benefits are:

  • Increased wall thickness
  • Longer tool joints
  • Uses more hard facing
  • May have a long central upset section

Heavy Weight Drill Pipe Specs

  • Heavy Weight Drill Pipe Quality Standard: API 7 and API 5DP.
  • Heavy Weight Drill Pipe Steel Grade: Integral heavy weight drill pipe: AISI 4145HM; Welded HWDP : AISI 1340.
  • Heavy Weight Drill Pipe pipe body, AISI 4140HM.
  • Heavy Weight Drill Pipe Outer Diameter: 2 7/8” – 6 5/8”.
  • Heavy Weight Drill Pipe Weight Range: 6.27#/FT through 27.72#/FT.
  • Heavy Weight Drill Pipe Lengths: Range 2 and Range 3.
  • Heavy Weight Drill Pipe End Finishes: Internal Upset, External Upset, Plain End Upset, Non Upset.
  • Heavy Weight Drill Pipe Tool Joint type:NC38、NC46、NC50、5-1/2 FH.

Heavy Weight Drill Pipe Specs Sheets From work strings international

PDF Spec SheetOD(in)ConnectionTubeID
Tool/Joint OD
TJ Yield
M/U Torque
Prem Tube
Spec Sheet3 1/2NC382 1/423.294 3/42 1/419,2009,600 – 11,520237,600StandardConventional
Spec Sheet3 1/2NC382 1/423.294 3/42 1/417,6008,800 – 10,560621,000IntegralConventional
Spec Sheet3 1/2NC382 1/429.724 3/42 1/419,2009,600 – 11,520237,600StandardSpiral
Spec Sheet3 1/2NC382 1/423.734 7/82 1/422,90011,450 – 13,740237,600StandardConventional
Spec Sheet3 1/2NC382 1/430.164 7/82 3/822,90011,450 – 13,740237,600StandardSpiral
Spec Sheet3 1/2NC382 1/425.364 7/82 5/1622,90011,450 – 13,740237,600StandardTri-Spiral
Spec Sheet3 1/2NC382 1/426.5552 1/424,80012,400 – 14,900237,600StandardConventional
Spec Sheet3 1/2HT382 1/425.364 7/82 1/434,20012,900 – 20,500237,600StandardTri-Spiral
Spec Sheet3 1/2HT382 1/430.394 7/82 9/1629,40012,200 – 17,700237,600StandardSpiral
Spec Sheet4XT382 9/1629.384 3/42 9/1631,30011,500 – 18,800407,600StandardTri-Spiral
Spec Sheet4TT3902 9/1628.814 7/82 9/1646,10023,000 – 32,300407,502StandardConventional
Spec Sheet4XT392 9/1628.244 7/82 9/1637,00012,400 – 22,200407,600StandardConventional
Spec Sheet4XT392 9/1629.994 7/82 9/1637,00012,400 – 22,200407,600StandardTri-Spiral
Spec Sheet4XT392 9/1629.824 7/82 9/1633,90011,400 – 20,300815,200IntegralTri-Spiral
Spec Sheet4XT392 9/1629.264 7/82 9/1633,90011,400 – 20,300815,200IntegralSpiral
Spec Sheet4XTM392 9/1628.6952 9/1631,00015,500 – 18,600667,000XD-90Conventional
Spec Sheet4XT392 9/1628.6952 9/1640,80014,700 – 24,500407,600StandardSpiral
Spec Sheet4HT402 9/1628.6952 9/1628,50010,700 – 17,100815,200IntegralConventional
Spec Sheet4HT402 9/1630.4852 9/1628,50010,700 – 17,100815,200IntegralTri-Spiral
Spec Sheet4WT382 9/1628.6952 9/1643,3009,000 – 21,000 – 31,500815,200IntegralSpiral
Spec Sheet4XTM392 9/1628.6952 9/1637,20018,600 – 22,300407,600StandardSpiral
Spec Sheet4XTM392 9/1628.6952 9/1634,10017,000 – 20,400815,200IntegralConventional
Spec Sheet4 1/2GPDS402 3/438.035 1/42 3/433,30016,700 – 20,000548,100StandardConventional
Spec Sheet4 1/2Delta4252 3/437.235 1/42 3/451,40025,700 – 36,000548,060StandardConventional
Spec Sheet4 1/2Delta 4252 3/437.505 3/82 3/456,00028,000 – 39,200548,060StandardConventional
Spec Sheet4 1/2XTM402 3/436.855 1/42 3/438,20019,100 – 22,9001,096,100IntegralConventional
Spec Sheet4 1/2TT-4852 3/443.316 1/42 3/4108,00049,800 – 64,786548,100StandardTri-Spiral
Spec Sheet4 1/2XTM402 11/1639.535 1/42 11/1640,00020,000 – 24,0001,125,500IntegralTri-Spiral
Spec Sheet5XT50351.666 1/2398,30031,000 – 59,000691,200StandardTri-Spiral
Spec Sheet5NC50 (4-1/2″ IF)357.936 1/2352,00026,000 – 31,2001,382,300IntegralSpiral
Spec Sheet5XT50349.776 5/83105,30035,100 – 63,200691,200StandardConventional
Spec Sheet5NC50 (4-1/2″ IF)357.936 5/8353,00026,500 – 27,5001,382,300IntegralSpiral
Spec Sheet5NC50 (4-1/2″ IF)349.776 5/83 1/1656,50028,250 – 33,900691,200StandardConventional
Spec Sheet5NC50 (4-1/2″ IF)358.556 5/83 1/1656,50028,250 – 33,900691,200StandardSpiral
Spec Sheet5NC50 (4-1/2″ IF)352.346 5/83 1/1656,30028,150 – 33,700691,200StandardTri-Spiral
Spec Sheet5 1/2XT543 1/457.576 5/83 1/493,20026,600 – 55,9001,700,900IntegralConventional
Spec Sheet5 1/2TT5503 1/457.576 5/83 1/4850,40056,800 – 68,200850,400StandardConventional
Spec Sheet5 1/2Delta 5443 1/458.416 5/83 1/486,60043,300 – 52,000850,438StandardConventional
Spec Sheet5 1/2HT553 1/460.137477,20033,600 – 46,300850,400StandardConventional
Spec Sheet5 1/2XT573 1/459.5174106,20036,400 – 63,700850,400StandardConventional
Spec Sheet5 1/2HT553 1/460.877 1/83 5/16105,70040,600 – 63,400850,400StandardConventional
Spec Sheet5 1/2HT553 1/460.877 1/43 1/4105,50041,600 – 63,5001,700,900IntegralConventional
Spec Sheet5 1/25 1/2″ FH3 1/462.277 1/23 5/1678,50039,250 – 47,100850,400StandardConventional
Spec Sheet5 1/25 1/2″ FH DSTJ3 1/255.6273 1/285,20030,100 – 44,9001,555,100IntegralConventional
Spec Sheet5 1/2HT55455.247 1/8477,50033,800 – 46,500615,600StandardSpiral
Spec Sheet5 7/8XT57455.1474106,20036,400 – 63,700799,800StandardConventional
Spec Sheet5 7/8XT57457.4274106,20036,400 – 63,700799,800StandardTri-Spiral
Spec Sheet5 7/8TT-585456.9374116,50058,300 – 69,900799,800StandardTri-Spiral
Spec Sheet6 5/86 5/8″ FH4 1/273.598 1/24 1/275,00037,500 – 45,0001,021,600StandardConventional

Heavy Weight Drill Pipe Specs Selection And Design

Field tests indicated that fatigue build up in the Drill Pipe in the transition zone is related to the relative stiffness of the Drill Collars and the adjacent Drill Pipe. The stiffness ratio of two sections of pipe in the drill string is expressed by the equation,

HeavyWeight Drill Pipe Specs Selection

The field tests showed that the higher the stiffness ratio at the transition zone the greater the fatigue build up. Criteria for permissible stiffness ratio varies between different operators and areas. The following maximums are typical:

  • For shallow or routine drilling or low failure rate experience, keep stiffness ratio below 5.5.
  • For more severe drilling or for significant failure rate experience, keep SR below 3.5.

In order to reduce the stiffness ratio and increase service life of the drill pipe, heavy weight drill pipe having the same OD as the drill pipe and a wall thickness of up to 1 in and weight up to 78 lb/ft is used between the drill pipe and the drill collars. The number of joints used varies between 15 to 21 joints.

Use of HWDP offers the following advantages

  • Reduces drilling cost (check also drilling cost per foot) by eliminating Drill Pipe failures in the transition zone.
  • Significantly increases performance of small rigs through the ease of handling.
  • Provides substantial savings in directional drilling by replacing most of the Drill Collars string, reducing down hole drilling Torque and Drag.
  • Reduces tendency to become Deferentially stuck. This is due to the fact that large diameters are easier to stick than small diameters.

Heavy weight drill pipe normally has the same external dimensions as the regular Drill Pipe. In some types of Heavy Weight Drill Pipes, the tool joints are longer and, in some types, an extra mock tool joint is located in the center of the joint as shown in the below drawing.

HeavyWeight Drill Pipe Specs

Heavy weight drill pipe specs vary for different manufacturers. Typical dimensions are shown in below table

HeavyWeight Drill Pipe  Dimensions
Heavy weight drill pipe specs

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