Secondary expansion patching device passing through patching pipe

Abstract

The invention discloses a secondary expansion patching device passing through a patching pipe. The secondary expansion patching device comprises a hydraulic system, an expansion pipe and an expansion cone, wherein the outer diameter of the expansion cone is greater than those of the hydraulic system and the expansion pipe. The expansion cone comprises an upper expansion cone and a lower expansion cone, the cone surface of the upper expansion cone is opposite to the cone surface of the lower expansion cone, the cone angle of the upper expansion cone is smaller than the cone angle of the lower expansion cone, the expansion pipe is located between the upper expansion cone and the lower expansion cone, and the hydraulic system can drive the upper expansion cone and the lower expansion cone to conduct relative movement. When the secondary expansion patching device works, the cone angle of the upper expansion cone is smaller and is extruded into the expansion pipe firstly, a horn mouth is formed at the upper end of the expansion pipe, and the secondary expansion patching device is lifted; the expansion pipe is anchored by the original patching pipe through the horn mouth, the secondary expansion patching device continues to be lifted, the lower expansion cone enters the expansion pipe and passes through the expansion pipe, and then secondary patching is completed. In the secondary expansion patching device, the outer diameter of the expansion cone is the largest and is slightly smaller than the inner diameter of the original patching pipe, the outer diameter of the expansion cone is equal to the inner diameter of a secondary patching pipe, the inner diameter of the secondary patching pipe is roughly equal to that of the original patching pipe, and the inner diameter of the obtained secondary patching pipe is relatively large.

Description

technical field [0001] The invention relates to the technical field of the petroleum industry, in particular to a secondary expansion subsidy device for oversubsidized pipes. Background technique [0002] In the process of oilfield development, the downhole casing is often damaged. The expansion pipe subsidy technology is a common repair method. By driving the cone movement in the expansion pipe, the diameter of the expansion pipe is increased, and the downhole casing is subsidized. After expansion, the expansion The tube is a subsidized tube. [0003] Sometimes the damage to the downhole casing is continuous. After a damage subsidy, new damage will occur as time goes by. If the new damage occurs below the original subsidy pipe, it will need to go through a Original subsidies. [0004] A typical expansion pipe subsidy device such as figure 1 As shown, the front end of the connecting rod 1' of the expansion device is inserted into the tail end of the expansion cone 2', and...

AI Technical Summary

Problems solved by technology

[0003] Sometimes the damage to the downhole casing is continuous. After a damage subsidy, new damage will occur as time goes by. If the new damage occurs below the original subsidy pipe, it will need to go through a Original subsidy management

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