Process for manufacturing corrosion resistant low-chromium tubing in CO2 and H2S coexisted environment

A preparation process and corrosion-resistant technology, applied in the direction of manufacturing tools, process efficiency improvement, pipes, etc., can solve the problems of high one-time investment of high-alloy steel, complicated corrosion inhibitor filling process, and hidden danger of local corrosion of the coating layer. , to achieve the effect of improved resistance to CO2 corrosion and superior resistance to CO2/H2S corrosion

Active Publication Date: 2009-12-09
XIAN MAURER PETROLEUM ENG LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex filling process of corrosion inhibitors and high long-term investment, the damage of the coating layer during use will cause local corrosion hidden dangers and other problems. The safest protective measure is still to use corrosion-resistant materials
However, the strength of FRP is insufficient, and the one-time investment of high-alloy steel is too large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: a kind of CO 2 and H 2 The preparation process of the corrosion-resistant low-chrome oil casing in the S coexistence environment comprises the following steps in sequence,

[0033] 1. Steelmaking: raw materials include the following components (wt%), C: 0.20%, Si: 0.37%, Mn: 0.47%, P: 0.011%, S: 0.003%, Cr: 2.95%, Mo: 0.67%, Cu: 0.11%, Ni: 0.009%, Al: 0.036%, Nb: 0.044%, Ti: 0.03%, B: 0.002%, V: 0.07%; the control components (wt%) are: As: 0.012%, Sn: 0.008%, Ca treatment, Ca / S ratio is 1.5; the rest is iron.

[0034] Use electric arc furnace to directly reduce iron and pig iron to obtain base metal with low concentration of residues and inclusions, refine base metal in ladle furnace, then secondary alloying, and finally degassing, wherein: feed Si-Ca wire inclusion metamorphosis The treatment is to spheroidize manganese sulfide inclusions, reduce the sensitivity of HIC ladder cracks, and the Ca / S ratio is ≥ 1.5;

[0035] II. Rolling: Rolling is the se...

Embodiment 2

[0038] a CO 2 and H 2 The preparation process of the corrosion-resistant low-chrome oil casing in the S coexistence environment comprises the following steps in sequence,

[0039] I. Steelmaking:

[0040] Including the following components (wt%), C: 0.22%, Si: 0.50%, Mn: 0.50%, P: 0.015%, S: 0.004%, Cr: 3.10%, Mo: 0.42%, Cu: 0.15%, Ni : 0.05%, Al: 0.044%, Nb: 0.047%, Ti: 0.03%, B: 0.002%, V: 0.09%; control components are: As: 0.014%, Sn: 0.01%, Ca treatment, Ca / S ratio 1.5; the rest is iron.

[0041] Use electric arc furnace to directly reduce iron and pig iron to obtain base metal with low concentration of residues and inclusions, refine the base metal in a ladle furnace, then secondary alloying, and finally degassing, wherein: feeding Si-Ca wire inclusion metamorphosis The treatment is to spheroidize manganese sulfide inclusions, reduce the sensitivity of HIC ladder cracks, and the Ca / S ratio is ≥ 1.5;

[0042] II. Rolling: During the rolling process, the thickness of t...

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Abstract

The invention relates to the technical field of oil pipe material, in particular to a process for preparing a corrosion resistant low-chromium oil sleeve under the coexisting environment of CO2 and H2S. The invention overcomes the problems existing in the prior art. The technical proposal provided by the invention is that the process for preparing the corrosion resistant low-chromium oil sleeve under the coexisting environment of CO2 and H2S orderly comprises the following steps: 1. steel-making, wherein an electrified arc furnace is used to directly reduce iron and pig iron to obtain base metal, the base metal is refined in a ladle furnace and alloyed twice, and finally gas in the base metal is removed; 2. rolling, wherein the correct size of the material required is obtained by the step; and, 3. heat treatment and finishing. Compared with the prior art, the process has the advantages that the material prepared by the process has good CO2 / H2S corrosion resistance and economical efficiency; when used in the underground mining, the material can replace the common carbon steel; and the cost is no more than 150 percent higher than that of the oil sleeve material in the same level, but the material can bring much more benefits.

Description

Technical areas: [0001] The present invention relates to the technical field of petroleum pipe materials, specifically to CO 2 and H 2 Preparation process of corrosion-resistant low-chromium oil casing in S coexistence environment. Background technique: [0002] With the in-depth development of oil and gas fields, CO-containing 2 / H 2 The number of oil and gas wells in S is increasing, and accidents caused by corrosion damage to oil and casings occur frequently, which seriously affects the safe production of oil and gas fields, and becomes increasingly serious with the deepening of development. For CO 2 / H 2 The main protective measures taken for S corrosion include: using corrosion-resistant materials (including the use of fiberglass and alloy steel with high alloy composition), adding corrosion inhibitors and using anti-corrosion coatings. However, due to the complicated corrosion inhibitor filling process and high long-term investment, damage to the coating during u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P17/00C22C38/54C21C5/52C21C7/04C21D9/08C21D1/18F16L9/02
CPCY02P10/20
Inventor 韩勇赵国仙李平全吕祥鸿
Owner XIAN MAURER PETROLEUM ENG LAB
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