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A kind of pipe butt welding process method of continuous pipe

A process method and coiled tubing technology, applied in the field of butt welding of coiled tubing, can solve problems such as harsh working conditions, damage to downhole equipment, coiled tubing fracture, etc., and achieve high temperature with short residence time, not easy to overheat, and thermal influence. small area effect

Inactive Publication Date: 2018-10-23
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during operation, when coiled tubing is partially damaged by hard bending, leakage, etc., in order not to affect the production progress and the economic benefits of the company, the oilfield company is eager to hire a worker with no experience in coiled tubing welding and no special welding tooling. , and there are no welders with mature welding procedure specifications, the conventional manual arc welding method is used to complete the repair. The coiled tubing will break from the repaired part within a short period of time, the light one will damage the downhole equipment, and the severe one will cause the oil well to be scrapped

Method used

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  • A kind of pipe butt welding process method of continuous pipe
  • A kind of pipe butt welding process method of continuous pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The dimensions and grades of coiled tubing applicable to this embodiment are pipe diameter 50.8mm (2′), wall thickness 5.18mm, QT800 ultra-fine grain steel coiled tubing, yield strength σs≥550Mpa, tensile strength σb≥620MPa , using manual welding tungsten argon arc welding (TIG welding).

[0069] According to the method of the present invention, the groove processing angle is 75°, the blunt edge is 0.5 mm, and the joint gap is 2 mm. The welding process parameters are shown in Table 1.

[0070] Table 1 Process parameters of QT800 coiled tubing

[0071]

[0072] The welded joint performance of embodiment is as follows:

[0073] Stretching test:

[0074] Tensile test results (gauge length 50mm)

[0075] sample

σ b (MPa)

δ(%)

broken state

Coiled tubing base material

620

28-30

base material

Welded joint sample

622

27

fracture in heat affected zone

[0076] Bending test: The bending test of the welded joint a...

Embodiment 2

[0079] The dimensions and grades of the coiled tubing applicable to this embodiment are pipe 60.32mm (2.3 / 8′), wall thickness 5.18mm, QT900 ultra-fine grain steel coiled tubing, yield strength σs≥630Mpa, tensile strength σb≥ 715MPa. Tungsten argon arc welding (TIG welding) is used for manual welding.

[0080] According to the method of the present invention, the groove processing angle is 78°, the blunt edge is 0.5 mm, the joint gap is 2.5 mm, and the welding specification parameters are shown in Table 2.

[0081] Table 2 Process parameters of QT900 coiled tubing

[0082]

[0083] The QT900 continuous pipe weld seam after welding in this example is subjected to visual inspection and non-destructive inspection of the welded joint according to the GB / T5097-2005 inspection standard, and the results are all in line with the standard; after passing the 40-50MPa water pressure test, the coil pipe Put into use, the welded coiled tubing has been washed, gas-lifted, and sand washe...

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Abstract

The invention discloses a tube-to-tube butt welding technological method of a coiled tube. The method comprises the steps that tube ends on the two sides of the coiled tube are straightened, and V-shaped grooves are machined in the tube ends on the two sides; the inner walls and the outer walls of tube end joints are cleaned, and opening-alignment assembling is carried out; cooling blocks are additionally arranged on the tube ends, and internal protection gas is led into the tube ends on the two sides of the coiled tube; according to the characteristic that the coiled tube is high in strength and plasticity, low-assembling-level welding wires for the coiled tube are selected; and a small-wire energy multi-layer welding technological process is adopted, and manual argon tungsten-arc welding is utilized for carrying out bottoming, filling and cover surface welding. The welding technological method smoothly achieves tube-to-tube butt welding of the coiled tube, and a coil tube tube-to-tube butt welding joint with the excellent comprehensive performance is obtained; and the method makes up for the blank of the coiled tube tube-to-tube butt welding technical specification domestically, and the considerable economic benefits are generated for enterprises of oil and gas fields.

Description

technical field [0001] The invention belongs to welding technology, in particular to a pipe butt welding method of continuous pipe. Background technique [0002] Coiled tubing (CT for short, also known as coiled tubing, flexible tubing, serpentine tubing or coiled tubing) is the basis and important part of coiled tubing technology. A thousand-meter pipe without joints, mainly made of steel, coiled on a large-diameter (generally about 1m or more) reel. [0003] During the operation and construction, the coiled tubing coiled on the reel is sent downhole after traction, straightening, bending and re-alignment, and becomes the carrier of the working medium and the working string; after the operation, the reel reverses Movement, the coiled tubing is pulled out from the downhole and re-coiled on the reel for repeated use. Local damage and failure of the coiled tubing body will inevitably occur in coiled tubing operations. Removing the local damaged and failed pipe body and perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/028B23K9/235B23K9/095B23K101/10
CPCB23K9/0282B23K9/095B23K9/167B23K9/235B23K2101/10
Inventor 李霄王洪铎石凯周勇徐学利刘彦明潘瑞娟
Owner XI'AN PETROLEUM UNIVERSITY