Zhang, Liping
(CNPC Research Institute of Engineering Technology)
,
Zhang, Qibin
(CNPC Research Institute of Engineering Technology)
,
Zhang, Yanjun
(CNPC Research Institute of Engineering Technology)
,
Xie, Beibei
(CNPC Research Institute of Engineering Technology)
,
Zhang, Yingying
(CNPC Research Institute of Engineering Technology)
Aiming at the corrosion circumstances and corrosion prevention needs of downhole oil tubes, series protective coatings for downhole oil tubes have been developed in the authors' laboratory, including a baked type coating YG-01 and an air curing type coating YG-03, etc. The performance investigation ...
Aiming at the corrosion circumstances and corrosion prevention needs of downhole oil tubes, series protective coatings for downhole oil tubes have been developed in the authors' laboratory, including a baked type coating YG-01 and an air curing type coating YG-03, etc. The performance investigation of the coatings has been done for testing their corrosion resistance, mainly including salt fog test, immersion test in oil-field waste water and various acid solutions, high temperature and high pressure test in alkali solution or $H_2S/CO_2$ environment, as well as some other performances. The investigation results show that oil tube anti-corrosion coatings developed here can endure over 4000 hrs salt fog test, over 1000 hrs immersion in various acid solutions at room temperature and in boiling oil-field waste water. In addition, the coatings can keep intact after experiencing test in alkali solution under 70 MPa pressure at $150^{\circ}C$ for 24 hrs, and in simulative sour gas environment under the total pressure of 32 MPa ($P_{H_{2}S}=3.2MPa$, $P_{CO_{2}}=3.2MPa$) at $90^{\circ}C$ for 168 hrs, which show that the coatings can be used for corrosion prevention in downhole environments with specific high temperature and high pressure, such as sour gas wells. The other testing results show the oil tube protective coatings have excellent comprehensive performance.
Aiming at the corrosion circumstances and corrosion prevention needs of downhole oil tubes, series protective coatings for downhole oil tubes have been developed in the authors' laboratory, including a baked type coating YG-01 and an air curing type coating YG-03, etc. The performance investigation of the coatings has been done for testing their corrosion resistance, mainly including salt fog test, immersion test in oil-field waste water and various acid solutions, high temperature and high pressure test in alkali solution or $H_2S/CO_2$ environment, as well as some other performances. The investigation results show that oil tube anti-corrosion coatings developed here can endure over 4000 hrs salt fog test, over 1000 hrs immersion in various acid solutions at room temperature and in boiling oil-field waste water. In addition, the coatings can keep intact after experiencing test in alkali solution under 70 MPa pressure at $150^{\circ}C$ for 24 hrs, and in simulative sour gas environment under the total pressure of 32 MPa ($P_{H_{2}S}=3.2MPa$, $P_{CO_{2}}=3.2MPa$) at $90^{\circ}C$ for 168 hrs, which show that the coatings can be used for corrosion prevention in downhole environments with specific high temperature and high pressure, such as sour gas wells. The other testing results show the oil tube protective coatings have excellent comprehensive performance.
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대상 데이터
Test method: According to the testing method in Chinese National Standard GB/T 1771 (equivalent to ASTM B117), the coating specimens are put in Type SASS/450 Salt Fog Cabinet. The concentration of salt water is 50±1 g NaCl per liter with pH 6.
Test method: According to the testing method specified in NACE standard TM0185, the coating specimens were put in GSH-2T Type Autoclave. The test environment is the static condition simulated that of No.
성능/효과
Test result: Both YG-01 and YG-03 oil tube anti corrosion coatings have no softening and no bulging, but color thinned down a little. The coating’s adhesion keeps class A.
Test result: Both YG-01coating and YG-03 coating remain intact and glossy. No underfilm corrosion, blister or cracks in coating is observed after over 4000 hours in the salt spray cabinet.
Test result: YG-01 oil tube anti-corrosion coating remains intact and good glossy, but a little changed color compared with the specimens not tested. And YG-03 oil tube anti-corrosion coating keeps intact, good glossy and original color after tested for 168 hrs.
02%Hac at normal temperature. The test results show that both YG-01 baked cured oil tube internal coating and YG-03 air cured oil tube anti-corrosion internal coating remain intact without blister, cracks and other defects after over 1000 hrs.
The test results show that the two oil tube anti-corrosion coatings developed are of very good performance of H2S/ CO2 corrosion resistance at certain high temperature and high pressure. YG-03 oil tube anti-corrosion coating is better than YG-01 oil tube anti-corrosion coating in performance of H2S/CO2 corrosion resistance at certain high temperature and high pressure.
참고문헌 (3)
Li Lianbao and Xue Dengcun, Petroleum Engineering Construction (in Chinese), P 34, No.4 (1998)
Standard SY/T 5951-2004, The Technical Specification for Oil Tubes Coated with Epoxy Epoxy-Phenolic Resin Coating (in Chinese), Petroleum Industry Press of China, (2005)
Standard SY/T 0544-2004, The Technical Specification for Solvent Internal Coatings of Oil Drilling Pipes (in Chinese), Petroleum Industry Press of China, (2005)
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