Method of manufacturing a coiled tubing string

Patent metadata

Field	Value
Publication number	US-2018200770-A1
Application number	US-201715407855-A
Country	US
Kind code	A1
Filing date	Jan 17, 2017
Priority date	Jan 17, 2017
Publication date	Jul 19, 2018
Grant date	—

Abstract

A method of manufacturing a coiled tubing string that meets specified material properties in a single continuous operation.

First claim

We claim:

1 . A method of manufacturing a coiled tubing string, comprising:
uncoiling a flat metal sheet from an accumulator; bending the flat metal sheet that is uncoiled from the accumulator into a tubular form such that the edges of the flat metal sheet form a seam along a longitudinal length of the tubular form; welding the seam formed along the longitudinal length to form a tubing string; and coiling the tubing string onto a spool, wherein the tubing string is heat treated to meet specified material properties in a continuous operation from the accumulator to the spool.

2 . The method of claim 1 , wherein the seam is welded together by induction welding and/or other welding processes.

3 . The method of claim 1 , further comprising annealing the welded seam.

4 . The method of claim 3 , further comprising cooling the tubing string in an initial cooling operation after annealing the welded the seam.

5 . The method of claim 4 , wherein the initial cooling operation comprises air cooling the tubing string after annealing the welded seam.

6 . The method of claim 4 , wherein the initial cooling operation comprises water cooling the tubing string after annealing the welded seam.

7 . The method of claim 4 , further comprising conducting an initial sizing operation of the tubing string after the initial cooling operation.

8 . The method of claim 7 , further comprising conducting an initial inspection and testing operation of the tubing string after the initial sizing operation.

9 . The method of claim 8 , further comprising processing the tubing string in a heat treatment operation after the initial sizing operation.

10 . The method of claim 9 , wherein the heat treatment operation comprises austenitizing the tubing string.

11 . The method of claim 9 , wherein the heat treatment operation comprises quenching the tubing string.

12 . The method of claim 9 , wherein the heat treatment operation comprises tempering the tubing string.

13 . The method of claim 9 , further comprising cooling the tubing string in a final cooling operation after the heat treatment operation.

14 . The method of claim 13 , wherein the final cooling operation comprises air cooling the tubing string.

15 . The method of claim 13 , wherein the final cooling operation comprises water cooling the tubing string.

16 . The method of claim 13 , further comprising conducting a final sizing operation of the tubing string after the final cooling operation.

17 . The method of claim 16 , further comprising conducting a final inspection and testing operation of the tubing string after the final sizing operation.

18 . The method of claim 17 , wherein the tubing string is coiled onto the spool after conducting the final inspection and testing operation of the tubing string.

19 . The method of claim 1 , wherein the specified material properties include at least one of dimension, surface quality, roundness, yield strength, tensile strength, elongation, elastic modulus, toughness, fracture toughness, hardness, fatigue life, fatigue strength, ductility, grain size, corrosion resistance, microstructure, and composition.

20 . The method of claim 1 , wherein the specified material properties of the tubing string coiled onto the spool are substantially uniform across substantially the entire length of the tubing string.

21 . The method of claim 1 , wherein a length of the tubing string coiled onto the spool is within a range of about 10,000 feet to about 30,000 feet.

22 . A coiled tubing string formed by the method of claim 1 .

Assignees

• Forum Us Inc

Inventors

• Rowland Raymond

Classifications

• C21D8/10

  during manufacturing of tubular bodies · CPC title

• C21D1/18

  Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title

• B21C37/30

  Finishing tubes, e.g. sizing, burnishing · CPC title

• B21C37/08 Primary

  Making tubes with welded or soldered seams {(with helically arranged seams B21C37/122)} · CPC title

• C21D9/50

  for welded joints · CPC title