130KSI-grade and 135KSI-grade corrosion-resistant drill tool steel for oil and gas fields and manufacturing method thereof

A manufacturing method and oil and gas field technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of design, production, and manufacturing difficulties, and achieve the effects of saving production processes and costs, excellent strength and toughness, and strong corrosion resistance

Active Publication Date: 2017-09-19
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the requirements of the harsh working environment, new materials must meet high technical indicators. The design, production and manufacture of the elemental composition of steel

Method used

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  • 130KSI-grade and 135KSI-grade corrosion-resistant drill tool steel for oil and gas fields and manufacturing method thereof
  • 130KSI-grade and 135KSI-grade corrosion-resistant drill tool steel for oil and gas fields and manufacturing method thereof
  • 130KSI-grade and 135KSI-grade corrosion-resistant drill tool steel for oil and gas fields and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The diameter of the drilling tool steel bar used in the development of oil and gas fields involved in this example is 170 mm, and the contained element components and their mass percentages are: C: 0.28%, Si: 0.25%, Mn: 0.97%, P: 0.007%, S : 0.002%, Cr: 1.42%, Mo: 0.88%, V: 0.08%, Nb: 0.027%, Ni: 0.13%, Cu: 0.12%, Al: 0.027%, Ca: 0.0027%, the balance is Fe and impurities element.

[0053] The production process of the above-mentioned bars is as follows:

[0054] The smelting raw materials are configured according to the chemical element composition of the above-mentioned steel, followed by KR molten iron pretreatment-converter primary smelting-LF furnace refining-RH furnace vacuum degassing-continuous casting of 390×510mm rectangular billet-slab slow cooling-casting billet shot blasting -Continuous heating furnace heating-high pressure water descaling-continuous rolling-bar slow cooling-stress relief annealing-peeling-ultrasonic flaw detection + surface flaw detection ...

Embodiment 2

[0069] The diameter of the steel bar used in oil and gas field development involved in this example is 230mm, and the components and their mass percentages are: C: 0.29%, Si: 0.27%, Mn: 0.98%, P: 0.007%, S: 0.002% , Cr: 1.37%, Mo: 0.86%, V: 0.06%, Nb: 0.026%, Ni: 0.15%, Cu: 0.13%, Al: 0.025%, Ca: 0.0024%, and the balance is Fe and impurity elements.

[0070]The smelting, continuous casting, rolling and annealing processes of this implementation example are basically the same as those of Example 1 (wherein the size of the continuous casting slab produced is 600mm round slab), the main difference lies in the difference of subsequent products.

[0071] Round steel materials are used to manufacture heavy-duty drill pipe products. The specific production process is as follows: Round steel—fine straightening—normalizing + quenching + tempering—inner drilling—outer turning—comprehensive testing (hardness, mechanical properties, etc.)—inner Circular expansion drilling—ultrasonic flaw ...

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Abstract

The invention relates to high-toughness and hydrogen sulfide corrosion resistant round steel and a manufacturing method thereof. The round steel comprises, by mass, 0.25-0.40% of C, 0.20-0.45% of Si, 0.95-1.50% of Mn, 1.35-1.90% of Cr, less than or equal to 0.002% of S, less than or equal to 0.008% of P, 0.75-1.30% of Mo, 0.10-0.30% of Ni, 0.05-0.25% of V, 0.010-0.050% of Nb, 0.10-0.30% of Cu, less than or equal to 0.050% of Al, 0.0005-0.005% of Ca, and the balance Fe and unavoidable impurity elements. The hot-rolled round steel is produced through a process route of continuous casting-continuous rolling-annealing, the round steel is subjected to heat treatment directly, or a machined semi-finished drill tool is subjected to heat treatment. On the premise that related 130KSI and 135KSI synthesized mechanical properties are met correspondingly, according to an America NACE TM0177 standard hydrogen-sulfide-resistant stress corrosion test, a product is not broken for 720 hours under the condition that 70% of nominal yield stress is pre-loaded in a saturated H2S solution. The material is suitable for 130KSI-strength-grade and 135KSI-strength-grade drill tools under the mining environment of acidic oil and gas fields.

Description

technical field [0001] The invention belongs to the field of round steel preparation, and in particular relates to a 130KSI and 135KSI steel grade H 2 S corroded drill steel and method of manufacture. Background technique [0002] With the development of the world economy, energy consumption is increasing rapidly, and conventional oil, natural gas and other easy-to-exploit resources are becoming less and less, making it difficult to meet the growing energy demand. The exploitation of oil and gas fields has to be developed in deep sea, desert, north and south pole regions, and the environment of strong corrosive media such as hydrogen sulfide and carbon dioxide. H resistance of conventional 110KSI steel grade 2 S corrosion and 120KSI steel grade ordinary drilling tool materials often fail in today's harsh mining environment, causing the drilling system and even the entire well to be scrapped, bringing huge economic losses to oil and gas fields. Therefore, ordinary drilling...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/46C22C38/48C22C38/42C22C38/06C22C38/04C22C38/02C22C33/04C21D6/00C21D9/22
Inventor 邵淑艳孔祥伟顾铁胡绍鑫冀鸰李芸黄镇聂爱诚
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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