论文部分内容阅读
在含硫气井的钻井过程中对于HRC大于22的钻具钢材除了腐蚀疲劳之外,在pH值小于9的环境中还会发生硫化物应力腐蚀破裂,这种破坏比腐蚀疲劳更突然、更快,使钻杆大量损坏。含硫气井在钻井过程中,由于湿硫化氢的出现,常常会出现油管、套管、钻井设备、钻井仪器以及对支持保护管柱的水泥环柱等腐蚀和损坏问题,为此,阐述了湿硫化氢的腐蚀特点、机理,归纳总结了影响腐蚀的因素,综述了如何在这些方面防止其腐蚀,使损失减小,为指导油管、套管防腐工程实践提供了依据。建议在钻井过程中采用碱性钻井液,其pH值可到9或更高(至pH值12),以减缓或防止钻井过程中电化学从硫化物应力腐蚀破裂;含硫气井用的钻杆应该间歇使用。钻杆停用堆置时间可使其放氢,使钻杆恢复韧性,防止硫化物应力腐蚀断裂。
For drilling tool steels with HRC greater than 22 during sulfur-bearing well drilling operations, in addition to corrosion fatigue, sulfide stress corrosion cracking occurs in environments with pH values less than 9, which are more abrupt and faster than corrosion fatigue , A large number of drill pipe damage. Sulfur-containing gas wells, such as tubing, casing, drilling equipment, drilling equipment, and cement rings that support protective columns often suffer from corrosion and damage due to the presence of wet hydrogen sulfide during drilling. To this end, wet Hydrogen sulfide corrosion characteristics and mechanism, summed up the factors that affect corrosion, reviewed how to prevent corrosion in these areas, so that loss is reduced, to guide the tubing, casing corrosion engineering practice provides the basis. It is recommended to use a basic drilling fluid during drilling to a pH of 9 or higher (to pH 12) to mitigate or prevent galvanic corrosion from sulfide stress corrosion cracking during drilling; a drill pipe for sour gas wells Should be used intermittently. Drill bar deactivation The stacking time allows it to discharge hydrogen, restoring the drill pipe toughness and preventing sulphide stress corrosion cracking.