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Sucker Rod Coupling Resistant to Hydrogen Sulfide Corrosion

A sucker rod coupling, hydrogen sulfide resistance technology, applied in drill pipe, drilling equipment, earthwork drilling and other directions, to achieve the effect of good solid solution strengthening, high corrosion resistance, and improved yield strength

Active Publication Date: 2018-06-05
DONGYING XIANHENG IND & TRADE +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The problem to be solved by the present invention is to provide a sucker rod coupling sprayed with an alloy coating resistant to hydrogen sulfide corrosion, so as to meet the demand for rods in wells with severe hydrogen sulfide corrosion in oil fields under the condition of low cost

Method used

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  • Sucker Rod Coupling Resistant to Hydrogen Sulfide Corrosion

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Embodiment Construction

[0013] (1) Sucker rod coupling

[0014] The present invention is a hydrogen sulfide corrosion-resistant sucker rod coupling, which is sprayed with an alloy spray coating on the surface of the sucker rod coupling; wherein:

[0015] In terms of mass percentage, the composition of the alloy spray coating is: C: 0.2-0.6%; B: 3-5%; Si: 3.5-5.5%; Mn: 0.5-1.0%; Cr: 19-24%; Cu: 5-7%; Mo: 2-3%; rare earth: 0.04-0.08%; Fe: 0-4%; Nb: 0.5-1.5%; the balance is Ni; wherein the rare earth is a mixture of La and Ce.

[0016] In the research and development of hydrogen sulfide-resistant alloy powder, the corrosion resistance of the alloy powder is improved by adding an appropriate amount of Cr and other alloying elements. Studies have shown that Cr is the main corrosion-resistant element for most hydrogen sulfide-resistant materials, by forming Cr 2 o 3 The passivation film plays the role of isolating the sulfur-containing medium and improving the material's resistance to hydrogen sulfide c...

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Abstract

The invention relates to a sucker rod coupling resistant to hydrogen sulfide corrosion and relates to oil pumping equipment in an oil field. Its purpose is to provide a sucker rod coupling sprayed with a hydrogen sulfide corrosion-resistant alloy coating, so as to meet the demand for rods in wells with severe hydrogen sulfide corrosion in oil fields under the condition of low cost. The present invention is a sucker rod coupling resistant to hydrogen sulfide corrosion. The surface of the sucker rod coupling is sprayed with an alloy spray coating; wherein, in terms of mass percentage, the composition of the alloy spray coating is: C: 0.2-0.6% ; B: 3-5%; Si: 3.5-5.5%; Mn: 0.5-1.0%; Cr: 19-24%; Cu: 5-7%; Mo: 2-3%; rare earth: 0.04-0.08%; Fe: 0-4%; Nb: 0.5-1.5%; the balance is Ni.

Description

technical field [0001] The invention relates to an oil pumping device in an oil field, in particular to a sucker rod coupling. Background technique [0002] Pumping wells have always been the main method of oil production in oilfields at home and abroad, among which the sucker rod string (including sucker rod and oil pumping rod) is an important part of the rod pumping equipment, and its function is to transmit the power of the pumping unit Pump the oil well downhole and extract the oil through the oil well pipe. [0003] With the increasing number of deep wells, ultra-deep wells, heavy oil wells, corrosion wells and high water-cut wells, the working conditions of sucker rod strings are becoming increasingly harsh, and the corrosive medium contained in crude oil is increasing. Corrosion damage is becoming more and more serious. [0004] The sucker rod coupling is the component that connects the sucker rod downhole, and is subject to the corrosion of crude oil just like the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/02
Inventor 余传谋赵磊付显威毕伟付小坡高文明刘奕彤张存广刘涛吴振宁
Owner DONGYING XIANHENG IND & TRADE
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