Corrosion Analysis and Pipe Material Selection of Fluid Control Pipeline in A Well of Lüda Oilfield

doi:10.3969/j.issn.1006-396X.2021.05.010

Abstract

Abstract:

Well A in Lüda oilfield is a thermal recovery well injecting with 350 ℃ high temperature and pressure steam for exploiting of heavy oil. The hydraulic control pipelines of the downhole monitoring equipments are corroded seriously. Scanning electron microscopy (SEM) and electron energy spectroscopy (EDS) were carried out for the corrosion test of hydraulic control pipelines. Meanwhile, the ion and corrosive gas compositions of produced water were analyzed. The results show that the main cause of the pipeline corrosion is from H₂S corrosion under high temperature, pressure and salinity conditions, accompanied by a small amount of chlorine and CO₂ corrosion. Under simulated site temperature, pressure and medium conditions, test pieces made of 316L, Inconel 625, P110 and 9Cr1Mo were selected and evaluated by dynamic simulation corrosion tests. Furthermore, weight loss method was used to evaluate the corrosion performance of the four materials. The results show that Inconel 625 material has the best corrosion resistance effect in heavy oil thermal recovery environment.

Key words: Heavy oil thermal recovery, Corrosion protection, Dynamic corrosion experiment, H₂S

摘要：

旅大油田A井为稠油热采井，注350 ℃高温高压蒸汽，井下监测设备液控管线腐蚀严重。通过扫描电子显微镜(SEM)以及电子能谱分析(EDS)对现场液控管线腐蚀试样进行分析，对采出液水样进行离子及腐蚀性气体成分分析，得出该管线腐蚀主要原因是在高温、高压和高矿化度条件下的H₂S腐蚀，并伴有氯离子腐蚀和少量CO₂腐蚀。在模拟现场温度、压力和介质条件下，挑选316L、Inconel 625、P110、9Cr1Mo材质的试片，进行动态模拟腐蚀实验，用失重法对4种材料的腐蚀性能进行了评价。结果表明，在稠油热采环境中，Inconel 625材料抗温耐蚀效果最优。

关键词: 稠油热采, 腐蚀防护, 动态腐蚀实验, 硫化氢

CLC Number:

TG172

Ye Xin, Zhilong Liu, Xiaotao Yu, Qi Zou, Chunyuan Wu, Chang Xiao, Gaoshen Su. Corrosion Analysis and Pipe Material Selection of Fluid Control Pipeline in A Well of Lüda Oilfield[J]. Journal of Petrochemical Universities, 2021, 34(5): 62-67.

辛野, 刘志龙, 于晓涛, 邹琦, 吴春元, 肖昌, 苏高申. 旅大油田A井液控管线腐蚀分析及管材优选[J]. 石油化工高等学校学报, 2021, 34(5): 62-67.

Figures/Tables 9

Table 1 Results of water sample analysis

离子	ρ（离子）/(mg·L^-1)
Na⁺	16 509.8
K⁺	276.3
Mg²⁺	1 998.1
Ca²⁺	312.8
Cl^-	29 198.9
SO $4 2 -$	3 758.3
CO $3 2 -$	62.0
HCO $3 -$	252.4
矿化度	51 694.3
CO₂	3.0
H₂S	50.0

Table 1 Results of water sample analysis

离子	ρ（离子）/(mg·L^-1)
Na⁺	16 509.8
K⁺	276.3
Mg²⁺	1 998.1
Ca²⁺	312.8
Cl^-	29 198.9
SO $4 2 -$	3 758.3
CO $3 2 -$	62.0
HCO $3 -$	252.4
矿化度	51 694.3
CO₂	3.0
H₂S	50.0

Table 2 Simulated water composition

试剂	ρ(试剂)/(g·L^-1)
MgCl₂	7.908 9
CaCl₂	0.866 0
KCl	0.527 8
NaCl	37.04 8
NaHCO₃	0.347 5
Na₂CO₃	0.109 6
Na₂SO₄	5.559 2

Fig.1 Corrosion of liquid control line on site

Fig.2 SEM of corrosion pit of liquid control line sample

Fig.3 SEM+EDS test results of liquid control line sample matrix

Fig. 4 EDS test results of corrosive parts of liquid control line

Fig.5 XRD analysis results of corrosion samples

Table 3 Dynamic simulation corrosion test results

钢材牌号	温度/℃	平均腐蚀速率/(mm·a^-1)
316L	200	0.049 5
	250	0.067 1
	300	0.079 9
	350	0.088 6
Inconel 625	200	0.006 8
	250	0.009 3
	300	0.010 6
	350	0.011 8
P110	200	0.019 2
	250	0.026 6
	300	0.033 6
	350	0.037 2
9Cr1Mo	200	0.095 4
	250	0.119 3
	300	0.138 7
	350	0.150 8

Fig.6 Influence of temperature on corrosion rate

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