Method for testing non-uniform loads in pipes
First Claim
1. A method for testing non-uniform loads on pipes, which employs a hydrostatic chamber provided with a test body, the method comprising:
- assembling the test body by placing an inner tube inside an outer tube;
filling a cement layer between an outer surface of the inner tube and an inner surface of the outer tube, the cement layer including at least one empty space along a circumferential direction of the cement layer, the empty space being generated to represent cementing layer failures between a case string and a containment pipe;
placing said test body in the hydrostatic chamber and pressurizing said hydrostatic chamber;
applying uniform stresses on the outer tube along an axial direction of the outer tube and a circumferential direction of the outer tube, the uniform stresses being generated by the hydrostatic chamber; and
measuring displacement and strain using sensor elements placed in the test body,wherein the empty space is shaped by placing at least one of a balloon with air or fluid, or any other filler material that will not influence load transfer effects between the inner and outer tubes prior to the filling.
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Abstract
The present invention refers to a method wherein a test body is assembled in specific configurations to be submitted to testing in a conventional hydrostatic chamber. The method calls for assembling a test body that simulates cementing failures, the presence of stress anisotropy and a borehole of irregular geometry, by pressurizing said test body in a conventional hydrostatic chamber. The uniform forces are distributed circumferentially around a casing stream in a non-uniform way, simulating operating conditions that are as close as possible to reality, enabling an analysis of how the structure reacts in scenarios similar to actual conditions.
8 Citations
17 Claims
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1. A method for testing non-uniform loads on pipes, which employs a hydrostatic chamber provided with a test body, the method comprising:
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assembling the test body by placing an inner tube inside an outer tube; filling a cement layer between an outer surface of the inner tube and an inner surface of the outer tube, the cement layer including at least one empty space along a circumferential direction of the cement layer, the empty space being generated to represent cementing layer failures between a case string and a containment pipe; placing said test body in the hydrostatic chamber and pressurizing said hydrostatic chamber; applying uniform stresses on the outer tube along an axial direction of the outer tube and a circumferential direction of the outer tube, the uniform stresses being generated by the hydrostatic chamber; and measuring displacement and strain using sensor elements placed in the test body, wherein the empty space is shaped by placing at least one of a balloon with air or fluid, or any other filler material that will not influence load transfer effects between the inner and outer tubes prior to the filling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification