Shaft corrosion prevention device

井筒防腐装置

Abstract

本实用新型涉及一种防腐装置,特别是一种油田井筒防腐装置,包括中心管、上接头、下接头通过螺纹连接在中心管的两端,其特征是:中心管外壁上套有保护套筒;中心管内壁的两端固定有挡圈,1个或多个花盘隔着衬套套装在芯轴上,芯轴两端穿过挡圈的中心,用螺母固定。本装置利用特殊合金的特点,在不用化学药剂、无电、无磁的情况下达到防腐的目的,有效减缓油田井筒腐蚀,并且使用方便,可在修井时一次下入井筒,不需要任何维修和保养。
The utility model relates to a corrosion prevention device, in particular to an oilfield shaft corrosion prevention device, which comprises a central pipe, an upper joint and a lower joint, wherein the upper joint and the lower joint are in threaded connection at two ends of the central pipe. The shaft corrosion prevention device is characterized in that a protective sleeve is sleeved on the outer wall of the central pipe, retainer rings are fixed at two ends of the inner wall of the central pipe, one or more faceplates is sleeved on a mandrel spaced by bushes, and two ends of the mandrel penetrate through centers of the retainer rings and fixed by nuts. The shaft corrosion prevention device achieves corrosion prevention by aid of characteristics of special alloy on conditions without chemicals, electricity or magnets, reduces corrosion of oilfield shafts, is convenient in use and free of maintenance or repair, and can be put into shafts when in workover treatment.

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