RU1810471C - Drill pipe - Google Patents

Abstract

Use: for equipping drill pipes for drilling oil and gas wells. SUMMARY OF THE INVENTION: A drill pipe includes locks installed at its ends with locking ribs with a constant thread pitch. Connecting elements are screwed onto the locking threads with the help of epoxy resin, degrading at a temperature that does not lead to softening of the device materials. The locking threads of the connecting elements have a variable thread pitch. Due to the ability to interchange the connecting elements, the life of the drill pipe increases. 1 ill.

Description

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The invention relates to drilling equipment and can be used in well drilling.

The purpose of the invention is to increase the resource of work.

The drawing shows a longitudinal section of a drill pipe,

A drill pipe consists of a pipe 1 and locks 2 installed at its ends with external and internal locking threads with a constant pitch, and connecting elements 3 with external and internal locking threads 4, 6 and 6, respectively, screwed to the locks 2, respectively. 7 variable steps. The connecting elements 3 can be made in the form of transition adapters. Between the threads connecting the lock 2 and the connecting element 3, an epoxy resin layer is placed, which destructs at a temperature that does not change the mechanical properties of the material of the pipe 1, the lock 2 and the connecting element 3. The connecting element 3 is made with an allowance of 172 mm outside diameter 5 3.4 mm. Variable steps required hardness on the connecting elements 3 receive technology ed. St. USSR No. 1219280. According to this technology, the thread of a constant step of a standard size corresponding to the locking thread of the locks 2 is initially cut on the connecting elements 3. After obtaining a variable pitch on the connecting elements 3, we consider the size of the thread of the elements 3 to be conditionally preserved.

Drill pipe works as follows.

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The drill pipes of the proposed design are screwed into the drill string using locking threads 4 and 7 of the free ends of the connecting elements 3. Threads 4 and 7 take up loads during tripping and drilling operations. At the same time, the external and internal locking threads of the locks 2 are not involved in the make-up screwing process; the locking threads of the locks 2 and the threads of 5.6 of the connecting elements 3 are bonded with an adhesive joint - epoxy resin. The allowance for the diameter of the connecting element 3 improves the grip of the screwed parts by the jaws of the AKB-ZM key and reduces wear of the locks. After the wear of the connecting elements by thread, each drill pipe is repaired: both connecting elements 3 are unscrewed and interchanged. To facilitate the flap of the connecting elements 3, it is possible to destroy the epoxy layer by heating to a temperature of destruction. For this purpose, an epoxy resin is selected with a temperature of destruction that does not change the mechanical

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the properties of the materials of the pipe 1, locks 2, connecting elements 3 during their joint heating. Unscrewing of the connecting elements 3 is carried out by known methods. After repair, the pipes are reassembled into the drill string.

Claims (1)

SUMMARY OF THE INVENTION A drill pipe, including locks installed at its ends with external and internal locking threads with a constant pitch, is that, in order to increase the service life, it is equipped with connecting elements with external and internal locking threads of variable pitch, each of the connecting elements of one of the threads is connected to the thread of one of the corresponding locks, and between these threads there is a layer of e-oxide resin, which destructs at a temperature that does not change the mechanical properties of the mat rial tube and lock the connecting element, the latter being formed with an outer diameter greater than the outer diameter of the lock.