A manufacturing method of a special solder-resisting composite sulfur-resisting drill pipe

Abstract

A special solder-resisting composite sulfur-resistant drill pipe and a manufacturing method thereof, comprising a drill pipe body and a stainless steel pipe, the diameter of the stainless steel pipe is 0.1-0.3mm smaller than the inner diameter of the water eye of the male joint of the drill pipe body, and the wall thickness is 0.5-2mm. The stainless steel pipe is inserted into the drill pipe body, and the stainless steel pipe is tightly attached to the inner wall of the drill pipe body by expanding the diameter, and then the end of the drill pipe body and the stainless steel pipe are welded and sealed to protect the inner wall of the drill pipe body. Compared with the prior art, the present invention has the following advantages: 1. The composite tube of the stainless steel pipe and the drill pipe body expanded in hydraulic mode, hydrostatic pressure mode or mechanical mode is safe and gentle, and will not damage the inner wall surface of the drill pipe. 2. The composite tube of the drill pipe body and stainless steel pipe can ensure that the inner wall of the drill pipe is more uniform, controllable, non-shedding and stable in use pressure relative to the coating; 3. It has high temperature resistance, wear resistance and corrosion resistance. Corrosion performance; 4. Smooth surface, reducing wear, greatly improving flow efficiency and prolonging the service life of drill pipe.

Description

technical field [0001] The invention relates to the technical field of metal composite pipes, in particular to a method for manufacturing a special solder-resisting composite sulfur-resistant drill pipe. Background technique [0002] With the development of the market economy, the further increase of energy demand, the improvement of oil resource exploration technology, deeper and more complex oil and gas fields are explored, and the technical requirements for oil equipment have also been raised to a new level. The original drilling equipment has lower requirements for drill pipes and less corrosion due to the shallower geology. With the improvement of oil resource exploration technology, more and deeper, corrosive oil and gas fields have been discovered and exploited, the requirements for previous drilling equipment have also increased, and the corrosion of drill pipes has become more serious. [0003] At present, the drilling team uses the inner coating method to protect ...

AI Technical Summary

Problems solved by technology

However, due to the shallow depth of the coating, the wear resistance of the inner wall of the drill pipe is still poor in complex well conditions, and it is easy to fall off at high temperatures, so it cannot achieve the effect of long-term use

The electroplating coating method is to combine the ionic elements with the metal through electrolysis, but this method is easy to cause micro-pit defects on the surface. During the drilling process, the effect of the coating coating on protecting the inner wall of the drill pipe from corrosion is slightly inferior. , and the promotion application is correspondingly less

[0004] In the further expansion of the oil drilling industry, the differences in the formation conditions of various oil fields have brought difficulties to the general promotion of anti-corrosion technology. Although the existing drill pipe anti-corrosion methods have achieved certain results and produced great benefits, they are still There are deficiencies such as low temperature resistance, non-wear resistance, incomplete corrosion resistance, and easy aging, which cannot meet the requirements of specific oilfield field production and application, and the system of in-depth research is also relatively lacking

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