Abstract
The expansion experiment of the expansion liner hanger is a one-time failure process, so in order to save cost, the finite element technology needs to be used to simulate the expansion experiment. Obtaining the mechanical parameters of the expansion liner hanger can effectively optimize the size of the expansion liner hanger structure and guide the expansion completion. Firstly, main structure and principle of expandable liner hanger were introduced. Secondly, mechanical equilibrium equations of the expandable process were established to obtain pressure of the expandable fluid, and pressure of the expandable fluid is obtained. Thirdly, finite element (FE) simulation mechanical model of the expansion of the Ø244.5 mm × Ø177.8 mm expandable liner hanger was established to analyze the hang mechanism and the change rule of mechanical parameters during the expansion. The FE results have shown that radial displacement and residual stress of the inner wall of hanger varied in 5 cycles, and the expansion ratio of the expandable tube was 7.4% during the expansion. The expansion force did not change stably but gradually increased in stages. And the hydraulic pressure required for the expandable cone to continuously move down was 18 MPa. According to the contact stress generated on five rubber cylinders and the contact stress generated on five metal collars, the total hang force has been calculated, which exceeds 1000 kN and meets the design requirements. Lastly, the expansion test results have shown that expansion pressure was 19 MPa, and the expansion rate was 7.1%. The mechanical analysis results of the expandable liner hanger were in good agreement with the experiment results in this study, which provide important mechanical parameters for well completion with expandable liner hanger.
Highlights
Academic Editor: Reza Kolahchi e expansion experiment of the expansion liner hanger is a one-time failure process, so in order to save cost, the finite element technology needs to be used to simulate the expansion experiment
According to the contact stress generated on five rubber cylinders and the contact stress generated on five metal collars, the total hang force has been calculated, which exceeds 1000 kN and meets the design requirements
A finite element (FE) simulation mechanical model of the Ø244.5 mm × Ø177.8 m expandable liner hanger is established. e conclusions are as follows: (1) When the hanger body is expanded, its radial displacement and the residual stress of the inner wall vary in 5 cycles due to that the five rubber cylinders are axially spaced by the metal convex collar on the expandable tube, and the expansion ratio of the expandable tube is 7.4%
Summary
Structure of the expansion portion of the expansion liner hanger designed in this study mainly includes the expandable cone assembly, the rubber cylinder (5 pieces), the expandable tube, the outer casing, the mandrel, and the pressure relief sleeve, as shown in Figure 1. e models of the expandable cone, 5 rubber cylinders, the expandable tube, and 10 metal convex collars are shown in Figure 2. e expandable structure is set as a state before expansion in the outer casing. e rubber cylinders are spaced on the expandable tube and are axially separated and positioned by the metal collar. E hang force consists of two parts: the first is the friction force generated by the rubber cylinder squeezed into the annulus between the hanger and the upper casing due to plastic deformation of the expandable tube, and the second is the contact force due to contacting deformation between the convex metal collar and the outer casing during the expansion When the cone moves down to the designed position, the pressure relief sleeve is pushed, the pin is sheared, the pressure relief hole is exposed, the pressure of the expandable fluid is released, and the expansion operation is completed. e hang force consists of two parts: the first is the friction force generated by the rubber cylinder squeezed into the annulus between the hanger and the upper casing due to plastic deformation of the expandable tube, and the second is the contact force due to contacting deformation between the convex metal collar and the outer casing during the expansion
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