Expansion hanger

Abstract

The invention discloses an expansion hanger which comprises an expansion tube, a pressing tube, a first plug, a bearing connector, a second plug, an expansion cone, a metal ring and a rubber sleeve. The expansion tube is provided with an expansion portion capable of expanding in the radial direction of the expansion portion. The pressing tube is arranged in the expansion tube in a penetrating mode, and annular space is formed by the pressing tube and the expansion tube. The first plug is used for plugging a cavity of the pressing rube. The bearing connector is used for sealing the front end of the annular space and is connected with the pressing tube through first threads, the bearing connector is connected with the expansion tube through second threads, and the first threads and the second threads are opposite in rotating direction. The second plug is used for sealing the rear end of the annular space. The expansion cone can slide in the annular space and divides the annular space into a front space and a rear space, the front space and the rear space are sealed, and a pressing hole communicated with the rear space is formed in the pressing tube. The expansion portion of the expansion tube is sleeved with the metal ring and the rubber sleeve. The expansion hanger can be widely suitable for hanging a sieve tube or a tail tube, no separation plate or bearing ring needs to be arranged, work time is greatly shortened, and the work risk is lowered.

Description

technical field [0001] The invention relates to a supporting device for underground oil exploitation, in particular to an expansion hanger. Background technique [0002] The hanger is an important part to realize the connection between the Christmas tree and the downhole production pipeline. Its main function is to hang the tubing string, seal the annular space between the tubing string and the casing string of the oil layer, and provide the channel for the production well fluid. The traditional packer is suspended and sealed by slips, which has problems such as poor sealing function and small inner diameter after suspension, which affects the operation and construction of oil and gas wells in the later stage. [0003] Expandable pipe technology is a new technology that has been booming in recent years, and it can be applied to drilling, well completion, oil production, workover and other operations. The expansion hanger is a new type of hanger developed based on the expans...

AI Technical Summary

Problems solved by technology

The installation of the clapboard makes the construction process complicated, which will inevitably increase the operation time and cost accordingly

The inner diameter of the hanger using the load-bearing ring is not consistent after the completion of the well, and it may cause the hanger to be set in advance, and it cannot be successfully dropped after construction, so there will be a certain construction risk

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