Expansion type liner hanger with slips

Abstract

The invention discloses an expansion type liner hanger with slips. The expansion type liner hanger comprises an outer cylinder, a core pipe and a first expansion cone, the outer cylinder comprises a first expansion pipe and a liner nipple, the first expansion pipe is connected with the liner nipple through a connecting sleeve, a plurality of slips are arranged on the connecting sleeve, the core pipe is arranged in the outer cylinder and comprises an upper center pipe and a lower center pipe, a movable core can be clamped on the inner wall of the lower center pipe and is positioned below the upper center pipe, a ball seat is arranged on the inner wall of the movable core, the outer wall is hermetically fitted with the liner nipple, the movable core is provided with a first pressure guide hole, the lower center pipe is provided with a second pressure guide hole, a liner rubber plug is arranged at the lower end of the movable core, the first expansion cone can be slidably arranged betweenthe first expansion pipe and the upper center pipe from bottom to top, and a first pressure cavity is formed among the first expansion cone, the outer cylinder, the core pipe and the movable core inan enclosed manner and communicated with the core pipe through the first pressure guide hole and the second pressure guide hole. According to the liner hanger, well cementation is performed after expansion setting, and the liner hanger is reliable in setting well cementation and low in expansion pressure.

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 replace the hanger, because after the cement slurry was replaced into the wellbore, it began to thicken and harden at the initial setting time. Once the cement slurry thickened and hardened, the liner string would be damaged. If you can’t get it out, even if you grab the time to pull out the pipe string, the cement slurry can’t be brought out, causing the cement slurry to deposit in the wellbore, and solidify to block the wellbore. To make the suspension force of the hanger meet the required index, the number of rubber rings used is more, and more rubber rings will cause the expansion tube to be difficult to expand, or even fail to expand

Images