南海高温高压含CO_2气井超级13CrS油管柱耐磨损性能测试

Wear Resistance Test of Super 13CrS Tubing String in High Temperature and High Pressure Gas Well with CO_2 in South China Sea

针对南海高温高压含CO_2气井油管在深井及超深井服役过程中的偏磨问题,模拟现场工况开展了大量油管磨损试验。使用自制磨损机,在常温常压下条件下,采用三种现场完井液及清水介质,施加三种不同侧向力,对以13CrS为主的两种不同材质及强度的油管材料进行磨损试验。试验结果表明,在含完井液的介质环境中,完井液能够有效保护油管,降低油管的磨损,其中完井液A减磨效果最好,达到80%~90%;在四种液体介质中,油管累计磨损量随着侧向力增加而增加,呈现出正比关系,且油管累计磨损量增加速率在磨损初期不断增大,而后逐渐减小变缓趋于稳定;在两种油管材料中,13CrS-110油管材料累计磨损量最低,耐磨性能最好。

Aiming at the problem of partial wear of high temperature and high pressure CO2 gas well tubing in the South China Sea during service in deep well and ultra deep well,a large number of tubing wear tests were carried out under simulated field conditions. Under normal temperature and atmospheric pressure,the wear of two different brand materials were tested in three different completion fluids and clean water by using the self-made wear machine. It focused on the performance of 13CrS materials in three different lateral force. The results show that the completion fluid can effectively protect the tubing and reduce the wear of the tubing,in which the completion fluid A has the best reduction effect,reaching 80% 90%. The trend of cumulative wear volume is that the tubing wear increases with the increase of lateral force,showing a linear relationship,and the cumulative wear rate increases with the time in the initial stage of wear,then gradually decreases,and becomes stable. Among the two kinds of oil pipe materials,the cumulative wear of A brand 13CrS-110 oil pipe is the lowest. Therefore,the wear resistance of A brand 13CrS-110 oil pipe is the best.