CO2 corrosion prediction plate establishing method considering multiple factors
A technology for establishing methods and predicting graphs, applied in design optimization/simulation, etc., can solve problems such as corrosion
Active Publication Date: 2020-05-19
SOUTHWEST PETROLEUM UNIV
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[0036] Simulate the actual working conditions of the XX oilfield and draw the corrosion prediction chart for the D-grade steel bar. The working conditions are as follows: wellbore temperature (60℃~120℃), CO 2 Partial pressure (0.1MPa~0.3MPa), chloride ion concentration (1000ppm~3000ppm), the specific implementation steps are as follows:
[0037] Step 1: Determine the parameter range of various influencing factors according to the actual working conditions of XX oilfield, among which the temperature parameters are 60℃, 75℃, 90℃, 105℃, 120℃, CO 2 The partial pressure parameters are 0.1MPa, 0.2MP, 0.3MPa and the chloride ion concentration parameters are 1000ppm, 2000ppm, 3000ppm;
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The invention discloses a CO2 corrosion prediction plate establishing method considering multiple factors, and belongs to the technical field of oil and gas field corrosion protection. The method comprises the following steps: firstly, carrying out corrosion weightlessness test on steel by adopting a high-temperature and high-pressure kettle at different temperatures, CO2 partial pressures and chloride ion concentrations to obtain a corrosion rate measured value; then establishing a function relational expression and a relation curve graph of the corrosion rate, the temperature, the CO2 partial pressure and the chloride ion concentration by utilizing a nonlinear fitting method; and finally, drawing a CO2 corrosion prediction plate by integrating the obtained corrosion rate measured value,the function relational expression and the relation curve graph. The method considers the influence of various factors on CO2 corrosion, has high prediction precision and practicability, provides a reference basis for preventing corrosion failure of oil field metal facilities, and provides a technical guarantee for safe use of materials.
Description
Technical field [0001] The invention belongs to the technical field of oil and gas field corrosion protection, and specifically relates to a CO 2 Corrosion prediction map establishment method. Background technique [0002] During the development of oil and gas fields, CO 2 Gas will cause severe corrosion to the pipes in the wellbore and equipment on the ground, causing corrosion failure of metal equipment, and even safety accidents. Indoor simulated corrosion is the main method to evaluate the corrosion resistance of materials. However, how to obtain the corrosion law of materials through the limited test data of indoor experiments is the key to predicting the applicability of materials and preventing equipment failure. It is to dynamically evaluate the corrosion status of equipment and oil pipes. , To draw reliable CO 2 The corrosion prediction chart predicts the corrosion life of metal pipes. [0003] At present, for the corrosion prediction of metal facilities in oil and gas fi...
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Inventor 曾德智韩雪喻智明董宝军于晓雨张新杨建起蔡乐乐
Owner SOUTHWEST PETROLEUM UNIV