定边采油厂降压增注新型酸液及添加剂性能评价

Performance Evaluation of New Acid Solution and Additive Added by Pressure-Relief Injection in Dingbian Oil Recovery Plant

针对定边采油厂某注水项目区域内主采层位为三叠系长8层酸化常规土酸酸化反应速度很快、作业距离短、二次、三次伤害严重、过度溶蚀、腐蚀严重等问题,开发了一种包含盐酸、氢氟酸、有机酸、氟硼酸以及多种添加剂,具有低腐蚀、低伤害、低反应速度、配伍性良好性能的新型酸液,并对新型酸液及添加剂性能进行了评价,结果显示:相比常规土酸,新型酸液缓速效果明显,适合深度酸化;同等添加量时,H03型缓蚀剂的缓蚀效果明显优于与H01、H02型缓蚀剂,且相同缓蚀效果条件下,H03型缓蚀剂的用量最少;螯合剂添加量1500 ppm时,稳铁能力达到最大值;表面活性剂HW-3用量500~2000 ppm,新型酸液与原油表面张力维持在18 mN/m左右,为维持一定的安全余量,3%新型酸液中添加1000 ppm的HW-3型表面活性剂。

In the area of a water injection project in Dingbian oil extraction plant, the main mining layer is acidified conventional soil acid acidizing reaction with fast speed, short operating distance, second time, third time damage, excessive erosion, and serious corrosion. A new acid solution containing hydrochloric acid, hydrofluoric acid, organic acid, fluoroboric acid and a variety of additives with low corrosion, low damage, low reaction speed and good compatibility has been developed, and the performance of new acids and additives has been evaluated. The results showed that the new acid was more effective than conventional soil acid, and was suitable for deep acidification. When the same amount was added, the corrosion inhibition effect of H03 corrosion inhibitor was better than that of H01 and H02 corrosion inhibitor. Under the same corrosion inhibition effect, the use of H03 corrosion inhibitor was the least;When the chelating agent is added to 1500 ppm, the iron stabilization capacity reaches a maximum;the surfactant HW-3 uses 500 - 2000 ppm. The surface tension between the new acid and crude oil is maintained at about 18 mN/m. In order to maintain a certain safety margin, 1000 ppm of HW-3 surfactant is added to the new acid solution of 3%.