Device and method for testing water line corrosion resistance of stainless steel pipe

Abstract

The invention discloses a device and a method for testing water line corrosion resistance of a stainless steel pipe. The device comprises an anode chamber and a cathode chamber which are mutually independent, the bottoms of the anode chamber and the cathode chamber are communicated through a connecting pipe, and a cathode and an anode are respectively arranged in the anode chamber and the cathode chamber for corrosion; different corrosive gases are respectively introduced into the anode chamber and the cathode chamber which are independent from each other, and the corrosion current of the anode chamber and the cathode chamber is monitored by means of a galvanic corrosion module of an electrochemical workstation through a method of increasing the concentration difference of the corrosive gases and adjusting the pH value of simulated liquid, so that the aim of quickly and accurately reproducing stainless steel waterline corrosion is fulfilled; the method is suitable for evaluating and researching waterline corrosion resistance of various stainless steel pipelines for ground gathering and transportation, realizes the aim of separating corrosive gas by isolating a cathode and an anode of waterline corrosion, ensures that an ion path and a sample shape between the cathode and the anode are not limited, can reproduce stainless steel waterline corrosion, and influence factors of waterline corrosion can be researched.

Description

technical field [0001] The invention belongs to the application field of oil and gas surface engineering, and in particular relates to a device and method for testing the waterline corrosion resistance performance of stainless steel pipes. Background technique [0002] With the increasing demand for oil and natural gas in my country, the exploration and development of oil and gas fields are developing towards deep wells and ultra-deep wells, and the composition of the produced medium is more complex, rich in CO 2 、H 2 Corrosive components such as S, high salinity of formation water, high content of chloride ions, and strong corrosiveness have brought severe challenges to the material selection of ground gathering and transportation pipelines. Conventional carbon steel pipes can no longer guarantee the intrinsic safety of oil and gas field surface gathering and transportation pipelines due to their poor corrosion resistance, while stainless steel pipes have excellent corrosi...

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Problems solved by technology

From the existing literature research and actual failure cases, it can be seen that there are three main reasons for the lack of research on stainless steel waterline corrosion. First, due to the good corrosion resistance of stainless steel, it is difficult for the general oil and gas field environment to meet the conditions for waterline corrosion to occur. There are fewer cases; second, the price of stainless steel is more expensive than carbon steel, and the amount of use is less, and the probability of problems is smaller; third, and most critical, carbon steel is more likely to reproduce waterline corrosion due to its poor corrosion resistance , while stainless steel has good corrosion resistance, it is difficult to reproduce waterline corrosion with general experimental methods and devices, especially for austenitic-ferritic duplex stainless steel with better corrosion resistance

At present, the common waterline corrosion test methods and devices are mainly aimed at carbon steel, but there is a lack of suitable evaluation methods and test devices for stainless steel waterline corrosion, and the detection of stainless steel waterline corrosion cannot be effectively realized

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