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Preparation method of V150 steel grade OCTG full-scale physical test sample

A physical test and sample preparation technology, applied to tubular objects, manufacturing tools, welding equipment, etc., can solve problems such as poor weldability, unsatisfactory welded joint strength, toughness and fatigue strength, and brittle welds

Active Publication Date: 2016-07-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] V150 oil well pipe is a high-grade steel material, and the test auxiliary rod is made of 30CrMo material. The components and metallurgical properties of the oil well pipe and the test auxiliary rod are very different, and the weldability is poor.
When the existing technology is used to weld V150 oil well pipe and 30CrMo auxiliary rod, the strength, toughness and fatigue strength of the welded joint cannot meet the requirements of V150 oil well pipe. Brittle fracture and fatigue fracture make the full-scale physical test evaluation of V150 steel grade oil well pipes unable to proceed smoothly

Method used

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  • Preparation method of V150 steel grade OCTG full-scale physical test sample

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Experimental program
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Embodiment 1

[0025] see figure 1 , the embodiment of the present invention provides a method for preparing a full-scale physical test sample of a V150 steel grade oil well pipe, and the method is operated according to the following steps:

[0026] Step 1 Welding preparation: take the oil well pipe 1, process the oil well pipe welding groove 4 at both ends of the oil well pipe 1, and process the plug welding hole 3 near the end face of the oil well pipe welding groove 4; take two auxiliary rods 2. Process each auxiliary rod 2 of the two auxiliary rods 2 with a welding groove 5 at one end, and process a thread at the other end of each auxiliary rod 2, and the thread can be processed into an internal thread or an external thread; The two pieces of auxiliary rods 2 are respectively inserted into the two ends of the oil well pipe 1, and the threaded ends of the two auxiliary rods 2 face outward to form a full-scale physical test sample of the oil well pipe.

[0027] Step 2 Preheating of weldme...

Embodiment 2

[0039] see figure 1 , the embodiment of the present invention provides a method for preparing a full-scale physical test sample of a V150 steel grade oil well pipe. The specific implementation process of the method is the same as that of Example 1, except that:

[0040] The oil well pipe 1 specification is: Φ244.48mm×15.11mmV150 steel grade oil well pipe, the chemical composition and its mass percentage are: C: 0.40%, Si: 0.18%, Mn: 0.50%, P: 0.014%, S: 0.0065%, Cr: 1.05%, Mo: 0.25%, Ni: 0.043%, and the balance is Fe.

[0041] The angle between the welding groove 5 of the auxiliary rod and the welding groove 4 of the oil well pipe is 38°. Three plug welding holes are processed at a distance of 105 mm from the end face of the welding groove 4 of the oil well pipe. The plug welding holes 3 are evenly distributed along the circumference of the pipe, and the processing groove angle of the plug welding holes 3 is 38°. Before welding, preheat the full-scale physical test sample of...

Embodiment 3

[0049] see figure 1 , the embodiment of the present invention provides a method for preparing a full-scale physical test sample of a V150 steel grade oil well pipe. The specific implementation process of the method is the same as that of Example 1, except that:

[0050] The oil well pipe 1 specification is: Φ177.80mm×12.65mmV150 steel grade oil well pipe, the chemical composition and its mass percentage are: C: 0.25%, Si: 0.23%, Mn: 0.55%, P: 0.0046%, S: 0.0016%, Cr: 1.02%, Mo: 0.78%, Ni: 0.046%, Cu: 0.051%, and the balance is Fe.

[0051] The angle between the welding groove 5 of the auxiliary rod and the welding groove 4 of the oil well pipe is 37°. Process 3 plug welding holes at a distance of 90 mm from the end face of the welding groove 4 of the oil well pipe. The plug welding holes are evenly distributed along the circumference of the pipe. The plug welding holes 3 are processed with a groove at a certain angle, and the groove angle is 37°.

[0052] Preheat the full-sc...

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Abstract

The invention discloses a preparation method of a specimen for full-scale physical test of V150 steel oil well pipes and belongs to the field of oil well pipe welding. The method includes the steps of weldment preparation, weldment pre-heating, welding, and post-welding treatment. Sufficient strength is imparted to a welding connector by additionally performing plug welding on an oil well pipe; sufficient toughness and fatigue strength are imparted to the welding connector by selecting right welding stick materials and a welding sequence; the requirement for evaluation on full-scale physical test of V150 steel oil well pipes can be met, and evaluation on the full-scale physical test of V150 steel oil well pipes can be performed smoothly.

Description

technical field [0001] The invention relates to the field of oil well pipe welding, in particular to a method for preparing a full-scale physical test sample of a V150 steel grade oil well pipe. Background technique [0002] V150 steel grade oil well pipe has ultra-high strength, which can meet the needs of deep well, ultra-deep well oil and gas field development and complex geological conditions oil and gas field development, and can bring huge economic benefits to the petroleum industry. The quality of oil well pipe is directly related to the safety of oil field development. Therefore, before using V150 oil well pipe, it is necessary to conduct a full-scale physical test and evaluation of its performance, so as to ensure the safety of oil and gas field development in deep wells and ultra-deep wells, and avoid personal casualties and property losses. [0003] When evaluating the full-scale physical test of oil well pipes, it is necessary to prepare full-scale physical test ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/02B23K9/235B23K35/24B23K101/06
CPCB23K9/028B23K9/235B23K33/00B23K35/3033B23K35/3066B23K2103/18
Inventor 王蕊李东风韩军杨鹏娄琦张广路张丹韩新利
Owner BC P INC CHINA NAT PETROLEUM CORP
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