Expansion type liner hanger with slips

Abstract

An expandable liner hanger with slips in the present invention includes: an outer cylinder, which includes a first expansion tube and a liner sub-joint, the first expansion tube is connected with the liner sub-joint through a connecting sleeve, and the connecting sleeve is provided with There are multiple slips; the core tube is set in the outer cylinder, which includes an upper central tube and a lower central tube. The inner wall of the lower central tube can be clamped with a movable core, and the movable core is located below the upper central tube. The movable core The inner wall of the core is provided with a ball seat, and the outer wall of the movable core is sealed and attached to the nipple of the tail pipe. The movable core is provided with a first pressure guide hole, and the lower central tube is provided with a second pressure guide hole. There is a tailpipe rubber plug; the first expansion cone, which can slide from bottom to top, is set between the first expansion tube and the upper central tube, and is surrounded by the first expansion cone, the outer cylinder, the core tube and the movable core. A first pressure chamber is formed, and the first pressure chamber communicates with the core tube through the first pressure guide hole and the second pressure guide hole. The invention performs well cementing after the expansion setting is completed, and the setting and setting cementing is reliable and the expansion pressure is low.

Description

technical field [0001] The invention relates to the technical field of drilling and completion in oil and gas field development, in particular to an expandable liner hanger with slips. Background technique [0002] With the development of science and technology, the current level of oil and gas field development has made great progress. At present, liner hangers are used in well completion methods such as sidetracking wells, horizontal wells, multilateral wells, directional wells, and ultra-deep wells. The traditional liner hanger is the packer type, which is gradually replaced by the expansion liner hanger due to its small inner diameter and poor sealing performance. The existing expandable liner hanger for well cementing utilizes the expansion of the metal pipe to squeeze the rubber ring vulcanized on its outer wall between the expansion pipe and the casing pipe, and has a large inner diameter and reliable sealing. [0003] However, the existing expandable liner hangers ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing expandable liner hangers for cementing are all cemented first in the construction process, and then expand and hang after the well is cemented and completed, that is, after the cementing plug is bumped and pressed, the tailpipe The expansion set-up can only be realized under the condition that the pipe can hold up the pressure. If the cementing plug fails to hit the pressure, or the liner has leakage and cannot hold the pressure, it will lead to the failure of the expansion set-up. Once the expansion set-up fails, the subsequent treatment The work was very difficult, and there was no chance to rework and re

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