drillingforall Posted: February 13, 2022 @ 8:29 pm

Drill pipe is used to transmit power by rotary motion from ground level to a drilling bit at the bottom of the hole and to convey flushing media to the cutting face of the tool. Thus it plays a vital pan in the successful drilling of oil and gas wells.

With the exception of specialty tools, it is probable that no other part of the drill stem is subjected to the complex stresses which drill pipe must withstand For this reason, the combined skill of steel industry engineers, with full cooperation by oil companies and drilling contractors and in conjunction with the API and IADC, has been used in the development of this vital tool. The same skill was utilized in formulating suggested practices in the care and handling of pipe on the surface, while making trips in the hole and while drilling. By utilizing this compiled information, contractors and operators alike may take full advantage of these developments and realize optimum economies by extended life of the pipe. An important consideration is that drill pipe is an important and expensive part of the total rig with relatively short life. The cost of the pipe places it in the category of a capital investment and not strictly expendable. A recommended practice, followed by many contractors, is to identify each joint upon pur- chase. In turn a recording should be made, along with its length, when it is placed in the string. By this means, and with some effort in the field and through office accounting, the following is made possible:

1. Useful life of the joint may be determined.
2. Type of service and/or stresses to which it is subjected may be recorded.
3. Switching within the string to obtain optimum use.
4. Determine causes of failures with greater accuracy.
5. Prevent or minimize downhole failures.

Too little of this type of feed back information is available. The more of this kind of data which is accumulated, the more assistance industry experts could be to the users. Results would be more economical operation for the contractor
and cheaper holes for the operator.

Drill string is also consisit of drill collar, drilling stabilizer, drilling jar and other items

Author:

Hassan Mohamed

Viewed:

45 Views