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为进一步发展石油科学技术,提高井下作业修井技术水平,我们参阅国外有关资料设计试制了2 1/2″可退式油管打捞矛,并在两口大修井进行了现场打捞试验,取得良好效果,现扼要小结于下:
In order to further develop the petroleum science and technology and improve the workover technology of downhole work, we made trial and trial of 2 1/2 "retractable tubing salvage spear with reference to relevant information from abroad and carried out on-site salvage test in two overhaul wells with good results. Now summarized in the following: