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华北油田留路、高阳、任丘等区块部分井中含有CO_2、O_2和H_2S气体。这些气体共同与钻井液作用形成碳酸,易使钻杆腐蚀、疲劳,或压裂刺穿,造成重大钻具失效事故。为解决钻杆早期刺穿失效问题,针对不同地区,不同地层的有害介质特点。探索出DPI-2型缓蚀剂的最佳用量和适用的腐蚀介质,验证了其作用原理。在5口井的钻井液中应用DPI-2型缓蚀剂,平均腐蚀速度下降到0.3mm/a,钻杆本体刺穿失效率下降了79％,钻杆工作进尺增加了11700m,防止了钻具的腐蚀。
Some reservoirs in the reservoirs of North China Oilfield, Gaoyang and Renqiu contain CO_2, O_2 and H_2S gases. These gases together with the formation of carbonic acid drilling fluid, easy to drill corrosion, fatigue, or fracturing piercing, resulting in major drilling failure. In order to solve the problem of early piercing failure of drill pipe, aiming at the characteristics of harmful media in different regions and different strata. Exploring the best dosage of DPI-2 corrosion inhibitor and the suitable corrosive medium, it verifies the principle of action. The application of DPI-2 corrosion inhibitor in drilling fluid of 5 wells decreased the average corrosion rate to 0.3mm / a, the piercing failure rate of the drill rod body decreased by 79% and the drilling rod working footage increased by 11700m, preventing drilling Corrosion with.