Method of joining coiled sucker rod in the field
OwnerKarel Bostikinventor
Life of this patent
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Abstract
A method of joining coiled sucker rod in the field. In its most basic form, the method includes a first step of placing abutting ends of sucker rod in face to face relation. A second step involves positioning a gas burner in proximity to the abutting ends of sucker rod and heating the abutting ends with a hydrocarbon gas flame while applying axial pressure to force the abutting ends together. A third step involves continuing heating and applying pressure until a weld is formed with a bulge formed above the weld which is at least one third of the diameter of the welded rod. A fourth step involves keeping the pressure constant until the weld cools.
Claims10
A method of joining coiled sucker rod in the field, comprising the steps of:
- placing abutting ends of sucker rod in face to face relation;
- positioning a gas burner in proximity to the abutting ends and heating the abutting ends with a hydrocarbon gas flame while applying axial pressure to force the abutting ends together;
- continuing heating and applying pressure until a weld is formed with a bulge formed above the weld, the bulge having the height at least one third of the diameter of the sucker rod being welded;
- and
- keeping the pressure constant until the weld cools;
- and
- the pressure being at least 17 kg/mm2 of the cross section of the welded rod.
A method of joining coiled sucker rod in the field, comprising the steps of:
- butt-welding a sucker rod, comprised of the steps of preparing the ends of sucker rods or attachments to said sucker rod using the tools which will assure creation of clean, smooth, and parallel faces of said rods;
- bringing said faces in full contact;
- preheating a minimum length of 2 inches of the end of each of said rods up to 300° C. with hydrocarbon gas;
- positioning the gas burner over the abutting ends of said rods and starting the heating of said rod ends with a hydrocarbon gas flame, up to temperature at which the surface of the welded rods begins to melt;
- applying pressure equal to or higher than 17 kg/mm2 of the crossection of the welded rod during welding, while continuing heating;
- discontinuing heating when the height of the bulge formed above the weld has reached at least one third of the diameter of the welded rod, while keeping said pressure at the constant level until the joint cools.
Dependencies are inferred from the claim text.