Drill pipe with tool joints

A technology of drill joints and drill pipes, which is applied in the direction of drill pipes, pipes/pipe joints/fittings, drill pipes, etc., can solve the problems of not being able to enhance the durability of drill joints, and achieve the effect of enhanced durability

Inactive Publication Date: 2009-10-14
TEMERSO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating wears off after the first refurbishment / damage cycle, up to ten cycles, followed by the metal threads
Therefore, currently used coatings do not enhance tool joint durability

Method used

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  • Drill pipe with tool joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The drill pipe consists of a pipe body 1 permanently connected at both ends 2 (welded connections) with connection joints (tool joints) 3 with external or internal tapered threads. For example, Figure 3 contains a fitting 3 with an external thread (pipe nipple). The other pipe end with an internally threaded joint is not shown in the figure. The relevant specifications of the pipe ends are completely similar.

[0015] The entire surface of the joint, except for the section 15-25 mm from the welding point, is treated with a coating 5, which is applied by means of thermal diffusion galvanizing. The thickness δ of the coating 5 is in μ (micrometer), which is 0.09 to 0.13K, where К is the thread taper. This correlation was determined experimentally by taking taper values ​​in the range from 1 / 6 to 1 / 4, which is the most commonly used value for tool joint threads.

[0016] The coating 5 is covered with a phosphating layer 6 . The phosphating layer is applied both to the ...

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PUM

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Abstract

The engineering problem of the claimed invention is to enhance wear- resistance of drill pipe tool joints. The proposed drill pipe consists of a body with upset ends and tool joints connected by means of friction welding, having tapered thread and a double coating, the first layer being applied by means of thermo-diffusion zincing and the second one, by means phosphate treatment. Enhancement of tool joint life, as compared to the tool joints with phosphate coating only, allows no overdimension to be stipulated for future repair purposes, which saves up to several kilos of metal per tool joint, decreasing the drill string weight by several tons. With a view to increasing the joints' durability and reliability of welding seams the thickness delta of the first coating layer as function of thread conicity K is adjusted according to the following formula: d = 0,09...0,13 K. The segment at 15 to 25 mm from the welding spot on joints is coated with phosphate only.

Description

technical field [0001] The present invention relates to a drilling rig, ie a drill pipe for drilling oil and gas wells. Background technique [0002] Drill pipe consists of the pipe itself (a relatively long element that is barely machined) and an interlock with a threaded connection (also known as a joint or tool joint). The latter are placed at the ends of the two tubes forming an integral joint or permanent connection. The device is further denoted by the term "drill pipe". The term "pipe" refers to semi-finished drill pipe without tool joints. [0003] Tool joints join pipe into a drill string and feature components with either external tapered threads (called pipe nipples) or internal threads (called tool joint boxes). Unlike tubes, tool joints are subject to complex machining. It is therefore more economical to produce short joints separately and then weld them on the bearing faces. Currently, the majority of drill pipe produced has flash welded tool joints. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042C23C26/00F16B33/06F16L15/08
CPCC23C28/3455C23C28/3225C23C28/347C23C28/345C23C28/00E21B17/1085F16B33/06C23C10/00E21B17/042
Inventor A·V·格季曼S·S·斯捷潘诺娃Y·A·特里福诺夫
Owner TEMERSO ENG
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