Method for manufacturing superior 13Cr thickened drillrod

Patent metadata

Field	Value
Publication number	US-10329648-B2
Application number	US-201314783139-A
Country	US
Kind code	B2
Filing date	Nov 12, 2013
Priority date	Apr 8, 2013
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A method for manufacturing a superior 13Cr thickened drillrod comprises the following steps: firstly, thickening the ends of a steel tube with a composition so as to obtain a drillrod with thickened ends, the composition in percentage by weight being: C: 0.01-0.05%, Si≤0.5%, Mn: 0.2-1.0%, Cr: 12-14%, Mo: 1-3%, Ni: 4-6%, and a balance of Fe and inevitable impurities; after heating the tube as a whole to 950-1000° C., air cooling same and tempering same at 600-650° C.; and machining the two thickened ends respectively into an externally threaded drillrod coupler and an internally threaded drillrod coupler; wherein the tube end thickening is an external thickening, including three rounds of heating and three rounds of thickening, with at least one pass of deformation for each round, and the heating temperature being 1150-1200° C. for each round; and the upsetting pressure for the first round of external thickening is 180-220 bars, the upsetting pressure for the second round of external thickening is 180-220 bars, and the upsetting pressure for the third round of external thickening is 140-180 bars. The drillrod according to the present invention can be used not only as a drillrod but also as an oil tube, fulfilling requirements of the exploration operation of a CO 2 -containing gas field of compact sandstone with a high yield.

First claim

The invention claimed is:

1. A method for manufacturing a superior 13Cr thickened drillrod according to the present invention, comprising the following steps: firstly thickening the ends of a steel tube with a composition so as to obtain a drillrod with thickened ends, the composition in percentage by weight consisting of: C: 0.01-0.05%, Si: 0.5%, Mn: 0.2-1.0%, Cr: 12-14%, Mo: 1-3%, Ni: 4-6%, and a balance of Fe and inevitable impurities; after heating the tube as a whole to a temperature of 950-1000° C., air cooling same and finally tempering same at 600-650° C., with the drillrod tube body and the thickened ends achieving a mechanic feature of 110 ksi; after the heating treatment of the drillrod, machining the two thickened ends respectively into an externally threaded drillrod coupler and an internally threaded drillrod coupler; wherein, the thickening of the tube ends is an external thickening, including three rounds of heating and three rounds of thickening, with at least one pass of deformation for each round, and the heating temperature being 1150-1200° C. for each round; and the upsetting pressure for the first round of external thickening is 180-220 bars, the upsetting pressure for the second round of external thickening is 180-220 bars, and the upsetting pressure for the third round of external thickening is 140-180 bars.

2. The method for manufacturing a superior 13Cr thickened drillrod as claimed in claim 1 , wherein the temperature to which the tube as whole is heated is 960-990° C.

3. The method for manufacturing a superior 13Cr thickened drillrod as claimed in claim 1 , wherein the tempering temperature is 610-640° C.

4. The method for manufacturing a superior 13Cr thickened drillrod as claimed in claim 1 , wherein the heating temperature for each round is 1160-1190° C.

5. The method for manufacturing a superior 13Cr thickened drillrod as claimed in claim 1 , wherein the upsetting pressure for the first round of external thickening is 190-210 bars.

6. The method for manufacturing a superior 13Cr thickened drillrod as claimed in claim 1 , wherein the upsetting pressure for the second round of external thickening is 190-210 bars.

7. The method for manufacturing a superior 13Cr thickened drillrod as claimed in claim 1 , wherein the upsetting pressure for the third round of external thickening is 150-170 bars.

Assignees

• Baoshan Iron & Steel

Inventors

• Zhao Peng
• Song Yanpeng
• Zhang Jianwei
• Wang Minghua
• Zhang Chunxia

Classifications

• C21D8/10

  during manufacturing of tubular bodies · CPC title

• C21D9/08

  for tubular bodies or pipes · CPC title

• C21D6/008

  containing Si · CPC title

• C21D6/005

  containing Mn · CPC title

• E21B17/00

  Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; {Cables;} Casings; Tubings · CPC title