油套管钢在甲酸盐-磷酸盐复配完井液中的腐蚀行为  

The Corrosion Behavior of Tubing and Casing Steels in Formate-Phosphate Compound Completion Fluid

作　　者：马磊 岳小琪 赵密锋[1] 张慧娟 邢星 王华 张雷 路民旭 MA Lei;YUE Xiaoqi;ZHAO Mifeng;ZHANG Huijuan;XING Xing;WANG Hua;ZHANG Lei;LU Minxu(Petrochina Tarim Oilfield Company,Shihua RD,Korla,Xinjiang 841000;Institute for Advanced Material and Technology,Material Science and Technology Beijing,Beijing 100083)

机构地区：[1]中国石油塔里木油田公司油气工程研究院,新疆库尔勒841000 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《钻井液与完井液》2020年第3期398-404,共7页Drilling Fluid & Completion Fluid

基　　金：国家重大科技专项“超深超高压高温气井优快捷井与采气技术”课题中央财政资金(2016ZX05051003)。

摘　　要：采用高温高压模拟浸泡试验并结合多种表面分析手段,对超级13Cr马氏体不锈钢(油管钢)和P110碳钢(套管钢)在不同体积百分比的甲酸钾-焦磷酸钾复配完井液的腐蚀行为进行了研究。结果表明,对于超级13Cr马氏体不锈钢,复配完井液的主要腐蚀风险来源于其中的S元素夹杂,产物膜中S的富集是造成其耐蚀性降低的主要原因;而对于P110碳钢,高温下腐蚀产物厚且疏松,甲酸盐比例的增加可以缓解其表面腐蚀产物的沉积,从而提高产物膜的致密性,提高其高温耐蚀性。The corrosion behavior of the 13Cr super-martensitic stainless steel(tubing steel)and P110 carbon steel(casing steel)in completion fluid formulated with potassium formate and potassium pyrophosphate in different volumetric ratios was studied with high temperature high pressure simulated soaking test method.It was found in the test that corrosion of the 13Cr super-martensitic stainless steel in the compound completion fluid comes from the inclusion of S element in the steel;enrichment of S in the product film of the steel is the major factor for the deterioration of its corrosion resistance.For the P110 carbon steel,the corrosion product at high temperatures is thick and loose.An increase in the ratio of formate in the compound completion fluid can mitigate the deposition of corrosion product on the surface of the P110 steel,thereby enhancing the tightness of the product film and improving the high temperature corrosion resistance of the steel.

关 键 词：焦磷酸钾 甲酸钾 超级13Cr P110碳钢 

分 类 号：TE257[石油与天然气工程—油气井工程]