A kind of 165ksi steel grade high-strength and high-toughness drill pipe and its manufacturing method
A manufacturing method and high toughness drill technology, applied in the field of drill pipe products, can solve problems such as insufficient strength and toughness of drill pipe, and achieve the effects of being beneficial to product toughness, improving the effect of fine-grain strengthening, and inhibiting grain boundary segregation
Active Publication Date: 2016-08-24
BAOSHAN IRON & STEEL CO LTD
View PDF4 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The mechanical properties of the drill pipe of the present invention meet the strength requirements of the 165KSI steel grade drill pipe, which is improved by more than 20% compared with the S135 steel grade, and has the high toughness of impact energy (full-size sample) not less than 80J at -20°C at the same time. Solve the problem of insufficient strength and toughness of API drill pipe under severe working conditions
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0030] The present invention will be further described below in conjunction with embodiment.
[0031] Table 1 is the composition example of the steel of the present invention. Table 2 shows the properties of steel examples of the present invention.
[0032]The production process of the drill pipe of the present invention is as follows: the materials of the following components are smelted, and continuously cast into a round billet; the round billet is fully heated at 1100°C to 1250°C, and is made after piercing, diameter reduction, continuous rolling and tension straightening. into a smooth pipe, the final rolling temperature is 880-950°C; the light pipe is subjected to end thickening treatment to obtain a drill pipe body, and the pipe body is subjected to full-pipe heat treatment, and the pipe body is heated to 890°C-950°C, held for 30-60 minutes for Austrian Tempering; cooling to room temperature with industrial water; finally tempering heat treatment at 550-650 °C, temperi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| crystal size | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a 165ksi steel grade high-strength high-toughness drill stem and a manufacturing method thereof. The drill stem comprises the following components in percentage by weight: 0.20-0.40% of C, 0.50-1.40% of Mn, 0.50-1.40% of Cr, 0.60-2.10% of Mo, 0.005-0.025% of Ti, 0.03-0.10% of Nb, 0.02-0.15% of V, 0.20-0.40% of Si, no more than 0.05% of Al, no more than 0.10% of N, no more than 0.015% of P, no more than 0.008% of S and the balance of Fe and inevitable impurities, wherein Mn reduced value=(3-6)*C added value, [Nb]+[Ti]+[V] <=0.25%, 5<=[Nb] / [Ti]<=10, and 1%<=[Cr]+[Mo] <=3%; and the average grain size of the drill stem structure is no less than 8.5 level, and the structure is tempered sorbite and a dispersedly distributed precipitation strength phase. According to the invention, the mechanical property of the drill stem is improved by 20% or above in comparison with S135 steel grade; and meanwhile, the drill stem has high toughness (the ballistic work (full-size test sample) is no less than 80J at -20 DEG C), to solve the problem that an API drill stem has insufficient toughness under severe working conditions.
Description
technical field [0001] The invention relates to a drill pipe product in the field of oil and natural gas exploitation drilling engineering, in particular to a 165ksi steel-grade high-strength and high-toughness drill pipe and a manufacturing method thereof. Background technique [0002] With the depletion of oil and gas resources, it is more difficult to develop oil and gas wells. In order to meet the needs of existing oil and gas exploitation, developers are faced with drilling projects under complex working conditions such as ultra-deep wells, extended-reach wells, deep sea or high temperature and high pressure. Wall thickness and so on have put forward new requirements. [0003] The improvement of the steel grade of drill pipe products can reduce the wall thickness of the drill pipe, reduce the frictional torque of the drill pipe when drilling ultra-deep wells and extended-reach wells, improve the hydraulic characteristics of the drill string, and make it easier for the ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28B23P15/00
Inventor 李云涛张忠铧钱华赵鹏张建伟刘绍锋董长富
Owner BAOSHAN IRON & STEEL CO LTD