Preperforated coiled tubing
AssigneeQuality Tubing, Inc.
InventorsJohn R. Martin, Martin B. Robertson, Jr.
Life of this patent
Estimating the term…
Abstract
Preperforated tubing is produced by forming a perforation in flat strip of raw material, forming a hollow, cylindrical tube from the flat strip, and placing a removable plug into the perforation, so as to form a fluid-tight seal. A sealing element may be placed into the perforation. The perforation may comprise a hole, into which first and second countersinks may be formed. The sealing element may be placed into the first countersink, and the plug may be placed through the countersinks and the hole, such that the plug's body fills the hole and the plug's head fits within the second countersink.
Claims11
A method of perforating tubing, comprising the steps of:
- forming a substantially circular hole in a section of tubing material;
- forming about said hole a first countersink having a first diameter and a first depth, said first countersink being substantially concentric with said hole;
- forming about said hole a second countersink having a second diameter and a second depth, said second countersink being substantially concentric with said first countersink and said hole, said second diameter being larger than said first diameter, and said second depth being smaller than said first depth;
- placing a sealing element substantially within the first countersink;
- and
- inserting a plug through said first and second countersinks and said hole;
- wherein a body of said plug substantially fills said hole and a head of said plug fits substantially within said second countersink, and wherein said sealing element and said plug cooperatively form a fluid-tight seal between an inner surface and an outer surface of said tubing material.
Dependencies are inferred from the claim text.