Abstract
The corrosion problem of a production system has been affecting the normal operation of an in situ combustion project. Because the environment of production system is significantly different in tubing, gas, liquid, and temperature in in situ combustion, the problem of the corrosion should be treated differently according to its origin. Based on the main environment of gas-liquid of the production system of in situ combustion, the corrosion of steel in N80 and J95, which are commonly used in oilfield, is studied in different temperature and pressure conditions. The results show that under the condition of 50°C and 3 MPa, the corrosion of the well is the most serious. Based on the analysis of corrosion causes in the production system, the corrosion under the protection of modified sacrificial anode in the liquid phase environment was studied. The results of comparative analysis show that the modified material had the dual protection effect of sacrificial anode and film-forming protection and could slow down the corrosion in different temperature ranges.
Highlights
In recent years, the international crude oil price fluctuates violently
In order to maintain the stable relationship between supply and demand of crude oil market, the development of conventional reservoirs in China has been increasing, resulting in the gradual reduction of underground reserves, and the water cut of most old oilfields has risen to a high level [1]
The technology of In situ combustion (ISC) is a process that the ground compressed air is continuously injected into the oil reservoir
Summary
In order to maintain the stable relationship between supply and demand of crude oil market, the development of conventional reservoirs in China has been increasing, resulting in the gradual reduction of underground reserves, and the water cut of most old oilfields has risen to a high level [1]. In situ combustion (ISC) is a promising heavy oil reservoir further EOR technology [2]; the large-area field tests of ISC technology have achieved very significant production increases in Liaohe, Xinjiang, and Suplacu oilfields [3]. The application of ISC technology in oil shale development is in progress [4]. The technology of ISC is a process that the ground compressed air is continuously injected into the oil reservoir. The mixture is ignited to achieve the purpose of oil displacement in the ISC process
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