Control Technology Of Corrosion Fouling In Qianan Region

The oil production Qian’an geographical condition is complex,, increasing mine life, well corrosion and scaling phenomenon is even more obvious, wells exemption shortened on repair rate continues to increase, resulting in decreased production of oil well, while consuming the human, material, and increase the cost of production, cause losses to oil exploration. In order to ensure the efficiency and stability of the oil reservoir, required in-depth research corrosion fouling governance technology.This thesis to determine the the Qian’an area wells corrosion fouling influencing factors are mainly water quality electrochemical corrosion,SRB corrosion,CO2corrosion due to differences between the rod and tubing material corrosion. Mainly CO2corrosion and SRB bacterial corrosion,and both have a synergistic effect.Quantitative analysis scale sample of the original set of wells corrosion and scaling,convenient, accurate, efficient and provide technical reference value for each block corrosion and scaling governance.Example to study the geological sedimentary reservoir wells corrosion and scaling relations to Qingshankou group,studies show that:the degree of influence of CO2on the corrosion of three sections:Qingshankou group1> Qingshankou group1+Qingshankou group2>Qingshankou group2>Qingshankou group3; the SRB bacteria on corrosion The degree of influence:Qingshankou group3>Qingshankou group1>Qingshankou group2;Qingshankou group1and Qingshankou group3wells corrosion mainly CO2and SRB bacterial corrosion; Qingshankou group1and Qingshankou group1+Qingshankou group2wells corrosion mainly CO2corrosion.For the the Qian’an block problem, indoor screening scale and corrosion inhibitor, using the same scale inhibitor EM final selection of corrosion inhibitor7019in accordance with the ratio of2:l,the dosage is120mg/L, the corrosion rate of0.0629mm/a,inhibition rate of91%.Select the further0.2%KI2%thiourea as synergist,corrosion rate of0.0315mm/a, scale inhibition rate reached100%.Scene wellhead dosing concentration detection analysis, improved dosing for continuous dosing the original two continuous dosing methods:self-balancing,diaphragm.Resolve the cycle dosing liquid production the pharmaceutical concentration fluctuations, instability in the late exist Pharmacy blind spot,a one-time dosing pharmacodynamic shortcomings not continuous play.Field trials designed sucker rod hanging film on-site quantitative evaluation of corrosion and scaling tools,oil rod hanging hanging piece evaluated Pharmacy in H123-3-1wells within different segments of wells real role in corrosion knot severe fouling of the well segments, the corrosion rate<0.0125mm/a can reach the standard requirement.