Design Method and Application of Casing Life under Corrosion Condition of Oxygen Reducing Air Flooding
Oxygen reducing air displacement technology can effectively increase the oil well production,but it intensifies the corrosion of the well casing.This will cause major dangers in the subsequent production process.This paper obtained the residual casing wall thickness of old wells,under the analyzing of the casing wall thickness loss caused by casing wear and corrosion.In view of the working conditions under the coexistence of oxygen and carbon dioxide,a variety of commonly used casing steel coupon corrosion tests were carried out.According to the results,the casing life check chart suitable for the target oilfield under the condition of oxygen reducing air flooding was given.With the casing life check chart,the service life of the well casing could be predicted.The results show that Cr steel can inhibit the corrosion of deoxidized air flooding to some extent.Under the production condition of oxygen reducing air drive,the original casing cannot be produced for a long time.
Oxygen Reducing Air FloodingCasing SelectionOxygenCorrosionCasing Steel Coupon
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