Corrosion resistant low chromium oil casing tube used in CO2 and H2S coexistence environment
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A corrosion-resistant, oil-casing technology
Inactive Publication Date: 2009-06-17
XIAN MAURER PETROLEUM ENG LAB
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[0003] The present invention provides a CO 2 and H 2 Corrosion-resistant low-chromium oil casing in S coexistence environment to overcome existing ...
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Embodiment 1
[0023] Embodiment 1: a kind of CO 2 and H 2 Corrosion-resistant low-chromium oil casing in S coexistence environment, including 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 composition range (wt%) is : As: 0.012%, Sn: 0.008%, Ca treatment, Ca / S ratio is 1.5; the rest is iron.
Embodiment 2
[0024] Embodiment 2: a kind of CO 2 and H 2 Corrosion-resistant low-chrome oil casing in S coexistence environment, 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%; the control composition range is: As: 0.014 %, Sn: 0.01%, Ca treatment, Ca / S ratio is 1.5; the rest is iron.
Embodiment 3
[0025] Embodiment 3: a kind of CO 2 and H 2 Corrosion-resistant low-chrome oil casing in S coexistence environment, including the following components (wt%), C: 0.24%, Si: 0.25%, Mn: 0.45%, P: 0.010%, S: 0.005%, Cr: 3.00 %, Mo: 0.65%, Cu: 0.25%, Ni: 0.025%, Al: 0.015, Ti: 0.010%, B: 0.0024%, Nb: 0.055%, V: 0.05%; the controlled composition range (wt%) is , As: 0.0120%, Sn: 0.012%, Sb: 0.006%, N≤: 0.005%, Ca treatment, Ca / S ratio is 1.5; the rest is iron.
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Abstract
The invention relates to the technical field of petroleum pipes, in particular to a corrosion resistant low-chromium oil bushing used in an environment in which CO2 and H2S coexist. Aiming at overcoming the problem of relatively high cost of pipes in solving the problem that the oil bushing is liable to be corroded with increasing coexistence environments of CO2 and H2S in the prior art. The technical proposal provided by the invention is that the oil bushing comprises the following compositions: C: 0.18-0.24%, Si: 0.25-0.50%, Mn: 0.45-0.55%, P: 0.01-0.015%, S: 0.003-0.005%, Cr: 2.95-3.10%, Mo: 0.40-0.75%, Cu: 0.10-0.25%, Ni: 0.009-0.05%, Al: 0.015-0.055%, Ti: 0.010-0.035%, B: 0.0018-0.0024%, Nb: 0.03-0.06% and V: 0.05-0.10%; controlled compositions (wt%) are as follows: ratio of As, Sn, Sb, N, Ca/S is 1.5 and the balance is Fe. Compared with the prior art, the invention has the advantages of superior effect and on increase in cost.
Description
Technical field: [0001] The invention relates to the technical field of petroleum pipes, in particular to a CO 2 and H 2 Corrosion-resistant low-chrome oil casing used in S coexistence environment. Background technique: [0002] With the deepening of oil and gas field development, CO 2 / H 2 The number of oil and gas wells in S is increasing, and accidents caused by corrosion damage of oil and casing occur frequently, which seriously affects the safe production of oil and gas fields, and becomes more and more serious with the deepening of development. for CO 2 / H 2 The protective measures taken for S corrosion mainly include: the use of corrosion-resistant materials (including the use of glass fiber reinforced plastics and alloy steel with high alloy composition), the addition of corrosion inhibitors and the use of anti-corrosion coatings. However, due to the complexity of the corrosion inhibitor filling process and the high long-term investment, the damage of the coati...
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