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Pipe for 105ksi titanium alloy petroleum drill rod and manufacturing method

A 105ksi, oil drill pipe technology, applied in the field of oil and gas industry drilling, can solve the problems of high cost, difficult processing and manufacturing, 105ksi grade drill pipe body mechanical properties and heat treatment process are not clear, etc., to achieve simple operation steps Effect

Inactive Publication Date: 2021-03-05
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

[0003] Titanium alloy oil drill pipes are in the research and development stage. The widespread application of titanium alloy pipes in the petroleum field is mainly due to the expensive alloying elements V, Mo, Zr, etc., which are difficult to manufacture and costly. The mechanical properties of grade drill pipe body and its heat treatment process are not yet clear

Method used

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  • Pipe for 105ksi titanium alloy petroleum drill rod and manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The titanium alloy oil drill pipe body provided by a company is used, its specific composition is Al: 5.1%, Mo: 0.8%, V: 3.2%, Zr: 1.7%, the rest is Ti, the unit is mass percentage, and its heat treatment process operation Proceed as follows.

[0035] Step 1, preparing materials according to the ratio of ingredients to be smelted and cast into a round billet;

[0036] Step 2: Heating the ingot to 1000°C and holding it for 1 hour to extrude, the extrusion ratio is greater than 9, and the extrusion speed is 17mm / s.

[0037] Step 3, rolling the above-mentioned extruded titanium alloy oil pipe at a rolling temperature of 500°C.

[0038] Step 4, coating Cr on the surface of the titanium alloy oil drill pipe body 2 o 3 protective coating.

[0039] Step 5, solid solution treatment is carried out on the pipe coated with the protective coating; the titanium alloy oil drill pipe body is sent into a heating furnace heated to 1000°C, kept for 60 minutes, and the pipe is air-coo...

Embodiment 2

[0043] Step 1, according to the mass percentage, take 4.9% Al, 0.7% Mo, 3.0% V and 1.5% Zr, and the rest is Ti, and make an ingot;

[0044] Step 2, heating up the ingot, the heating temperature is 980°C, and extrusion is carried out after holding the heat for 1 hour. During extrusion, the extrusion ratio is greater than 9, and the extrusion speed is 17mm / s;

[0045] Step 3, rolling the extruded billet at a rolling temperature of 450°C;

[0046] Step 4, coating the surface of the rolled pipe with a protective coating Cr 2 o 3 ;

[0047] Step 5, carry out solid solution treatment on the pipe coated with protective coating; raise the temperature of the pipe to 980°C, keep it warm for 45 minutes, and air cool the pipe to room temperature to complete the solution treatment;

[0048] Step 6: Perform aging treatment on the solution-treated pipe; heat the solution-treated pipe to 550° C., keep it warm for 5 hours, and air-cool to room temperature to complete the manufacture.

Embodiment 3

[0050] Step 1, according to the mass percentage, take 5.3% Al, 0.9% Mo, 3.3% V and 2% Zr, and the rest is Ti, and make an ingot;

[0051]Step 2, heating up the ingot, the heating temperature is 1050°C, and extruding after holding the heat for 1 hour, during extrusion, the extrusion ratio is greater than 9, and the extrusion speed is 17mm / s;

[0052] Step 3, rolling the extruded billet at a rolling temperature of 550°C;

[0053] Step 4, coating the surface of the rolled pipe with a protective coating Cr 2 o 3 ;

[0054] Step 5, carry out solid solution treatment on the pipe coated with the protective coating; heat the pipe to 1050°C, keep it warm for 60 minutes, air cool the pipe to room temperature, and complete the solid solution treatment;

[0055] Step 6: Perform aging treatment on the solution-treated pipe; raise the temperature of the solution-treated pipe to 650° C., keep it warm for 7 hours, and air-cool to room temperature to complete the manufacture.

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Abstract

The invention discloses a pipe for a 105ksi titanium alloy petroleum drill rod and a manufacturing method. A pipe body mainly comprises Al, Mo, V, Zr and Ti, physical mechanical property evaluation iscarried out on the pipe, tensile strength Rm, yield strength R0.2 and elongation A of the pipe are tested, Charpy impact test (V-shaped notch, longitudinal direction and room temperature) is carriedout to test impact energy of the pipe, and a metallographic structure is observed by a metallographic microscope. The measured numerical values can meet the mechanical property requirement of the 105ksi-grade drill rod, the blank of the manufacturing process of the 105ksi-grade titanium alloy petroleum drill rod pipe body at home and abroad is filled up, and the operation steps are simple.

Description

technical field [0001] The invention belongs to the field of oil and gas industry drilling and production, and in particular relates to a 105ksi titanium alloy oil drill pipe pipe and a manufacturing method. Background technique [0002] With the development of the modern petroleum industry and the gradual increase in the demand for oil and gas resources at home and abroad, the exploration and development of oil and gas have been continuously deepened, and the mining environment and formation conditions encountered are becoming more and more complex. Deep wells exceeding 7000m are becoming more and more common; offshore drilling It is no longer satisfied with shallow seas, and gradually marches into deep waters; on land, oil and gas wells with three highs (high temperature, high pressure, and high corrosion) that were difficult to exploit in the past have also begun to conquer. Although traditional steel drill pipe body materials such as 27CrMo and 30CrMo are still widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02B21C37/06C22F1/18
CPCB21C37/06C22C1/02C22C14/00C22F1/183
Inventor 冯春李睿哲刘永刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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