Overview of Heavy Weight Drill Pipes

Heavy weight drill pipe (HWDP) is similar in appearance to normal drill pipe with the exception of an upset area near the middle of the tube. Integral Heavy Weight Drill Pipe is made from AISI 4145H alloy steel. Acc. To API Spec.7 and SY / T5144. It is formed by hot forged and fully heat- treated. A Heavy Weight Drill Pipe (HWDP) looks like a normal drill pipe except for an upset centered along the tube which helps to prevent excessive buckling. Drill Pipe is placed near the top of a long drill string for additional support.

Heavy weight drill pipe is a type of drill pipe whose walls are thicker and collars are longer than conventional drill pipe.

Heavy weight drill pipe was developed as an intermediate weight drill string member. It was originally developed for three reasons:

1. As a transition member to be run between heavy weight drill pipe and drill collars.

2. As a flexible weight member to be run in directional drilling.

3. As a weight member on small rigs, drilling small diameter holes.

More recently, with the advent of horizontal drilling, it has found a new application being used in the curved portion of the hole below the drill collars.

The Heavy Weight Drill Pipes are the transition drill string section between the ordinary drill pipe and the drill collar, which can effectively relieve the stress concentration of the transition section between the drill collar and the drill pipe. The Heavy Weight Drill Pipes can also provide drilling pressure, and effectively reduce the drill string and the well. The connection area of the wall and the wear rate of the outer diameter. Heavy Weight Drill Pipe has a moderate weight per unit length for components on the drill string. This drill pipe is a heavy pipe wall body with extended joints. The outer diameter of the heavy weight drill pipe is similar to that of the standard drill pipe, so as to facilitate the operation of the drilling rig. The characteristic of the Heavy Weight Drill Pipes is that it can bear the pressure like a drill collar. A unique feature of Heavy Weight Drill Pipes is the hardbanding in the middle of the pipe. The wear-resistant band can act as a stabilizer, improve the rigidity of the heavy weight drill pipe in the drill string, and reduce the well deviation.

The heavy weight drill pipe is composed of outer cone and inner cone joints and a heavy pipe body with an intermediate wear-resistant structure.

Heavy weight drill pipe can handle the huge stresses induced in the drilling environment of vertical wells and directional wells.

There are many standard weighted auger pipes with the same function, but the middle enlarged part of the helical auger has three helical grooves.

The standard heavy weight drill pipe body is made of AISI 1340 steel or equivalent steel, while the joint is made of AISI 4137H modified alloy steel material.

Features of Heavy Weight Drill Pipes

1. Made of 4145H alloy structural steel.

2. Production complies with the provisions under the Standard SY/T 5146-1997. Connector screws comply with the provisions of the Standard API SPEC 7-1.

3. The tube section has a larger diameter at mid length to protect the heavy weight drill pipe from wear.

4. Hardbanding and Internal Coating can be provided on customer’s request.

5.  The joint of heavy weight drill pipe is longer than ordinary drill pipe, which can provide a larger wear-resistant surface and weight, and the joint thread can be repaired many times

6. It is heavier than the drill pipe of the same size, and the wall thickness is 2-3 times higher than that of the ordinary drill pipe. The outer diameter of the pipe body and the joint is the same as that of the ordinary drill pipe. The inner hole is flat and the diameter of the inner hole is at least equal to that of the drill collar. the inside diameter of.

7. The outer thickened section in the middle acts as a small stabilizer. Increased bending resistance.

8. The wear-resistant hard alloy is welded on the surface of the joint, and the service life can be extended by 4 times.

9. Fatigue failure of the drill string often occurs on several drill pipes above the drill collar, because the cross-section changes sharply when transitioning from the drill collar to the drill pipe, and the bending stress is concentrated on this part of the drill pipe. If 15 to 30 heavy weight drill pipes are added between the drill collar and the drill pipe, the change of the section can be eased, the stress concentration can be reduced, and the fatigue damage of the drill pipe connected with the drill collar can be prevented, thereby reducing drilling tool accidents . In addition, compared with the drill collar, the heavy weight drill pipe has the advantages of easy fishing, shortened tripping time, convenient transportation, etc., and can maintain the orientation of the directional well and play a role in stabilizing the inclination. Under the condition of the same hook load and drilling pressure, the use of heavy weight drill pipe can also improve the drilling depth capability of the drilling rig.

10. For directional wells: After the heavy weight drill pipe is connected to the directional well drill string, the drill collar and the heavy weight drill pipe body will not be tightly attached to the well wall, thereby reducing the possibility of sticking and sticking. In addition, sliding In the process of drilling, it is beneficial to control the trajectory of directional wells and horizontal wells. It can also better control the inclination angle and azimuth angle, reduce the number of directional work, and shorten the construction period of directional wells.

11. The structure of the heavy weight drill pipe is characterized by medium weight and thickened middle, which is similar to the drilling tool of the drill pipe, and its wall thickness is larger than that of the drill pipe and smaller than that of the drill collar.

12. Standard heavy weight drill pipe is friction welded.

13. The heavy weight drill pipe is manufactured from the integral bar of AISI 4137H improved alloy steel material in accordance with the requirements of NS-1 specification.

14. Extended life of heavy weight drill pipe to maximize your return on investment

15. Helps prevent stress concentrations that might otherwise occur Allows directional drilling torque control and reduces differential pressure sticking.

16. Provide extra long joints to allow more space for multiple repairs

17. The center of gravity reduces the wear rate through the outer diameter of the protective tube with additional intermediate upsetting or wear pads

18. Improve cutting cycle for better hole cleaning.

19. Enhance fatigue resistance. Cold rolling at the thread root of each connection is necessary to improve the connection's ability to withstand the cyclic stresses at the root of the more severe drill pipe threads through repeated severe tensile and compressive stresses during drilling operations resulting in failure. Cold-rolled thread roots harden to induce compressive stresses, minimizing crack formation and increasing fatigue resistance. Roll hardening induces compressive stress at the root of the thread, reducing crack formation and increasing fatigue resistance.

20. High performance rotary shoulder connection. Double shoulder connection, which is better than the traditional connection, meets stronger torsion resistance.

21. Extend drill pipe life. Hardbanding on tool joints or wear pads extends the life of the drill pipe. It is available in various configurations to suit customer requirements.

22. Hardbanding is performed under closely controlled conditions to form a consistent, low porosity, wear resistant surface. Use market-recognized hardbanding products, including ARNCO 100XT / 300XT, Tuboscope TCS8000 / TCSTI, Duraband NC, Tuffband NC and Castolin OTW 12. Extended joint length to increase the clamp length of heavy weight drill pipe, providing more times Number of deductions.

23. Surface protection. All heavy weight drill pipe connections use a phosphate coating to improve resistance to galling and corrosion. We can supply any commercially available internal coating on our heavy weight drill pipe. The coating forms a protective layer on the inner bore of the pipe to prevent corrosion, thereby extending the life of the drill pipe in the drilling environment.

Applications of Heavy Weight Drill Pipes 

1. The Heavy Weight Drill Pipe is the transition from flexible drill pipe to rigid drill collar during the drilling process. This transition is conducive to reducing fatigue failures

2. Heavy weight drill pipe can reduce stress concentration between drill pipe and drill collar.

3. Heavy weight drill pipe can also prevent the failure of differential pressure sticking.

4. The thickened part in the middle of the heavy weight drill pipe can avoid transitional buckling

5. Another use for a heavy weight drill pipe is to add extra weight to the drill bit.

Price of Heavy Weight Drill Pipes

The Heavy Weight Drill Pipes Price will change randomly with factors such as production cost, transportation cost, international situation, exchange rate, market supply and demand of raw materials. Sino Mechanical aims to provide you with high quality and best price Heavy Weight Drill Pipes. If you are looking for Heavy Weight Drill Pipes, please kindly contact us to get the latest Heavy Weight Drill Pipes price.

Heavy Weight Drill Pipes Supplier

Sino Mechanical, as a Heavy Weight Drill Pipes manufacturer, has more than 20 years extensive experiences in the performance, application and cost-effective manufacturing of Heavy Weight Drill Pipes. We are global Heavy Weight Drill Pipes supplier. We offer a wide range of drilling equipment and have Heavy Weight Drill Pipes for sale. We also provide OEM services. We design, manufacture, and sell Heavy Weight Drill Pipes for your drilling applications. If you want to know latest Heavy Weight Drill Pipes price, don’t hesitate to contact us anytime. We will get back to you within 24 hours.