Method for evaluating critical stress intensity and sensitive factor of stress corrosion cracking for oil well pipe

A technology of stress corrosion cracking and critical stress, applied in the direction of measuring devices, testing material hardness, instruments, etc., can solve problems such as differences in processing requirements and influences, and achieve strong practical effects

Active Publication Date: 2006-05-03
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, on how to measure and control fatigue crack growth, NACE and IRP did not publish standardized program terms, but only stipulated the load range and vibration frequency of pull-pull cyclic loading, which directly affected the high-strength sulfur-resistant oil well pipe K 1SCC Index determination and subsequent quantitative research on the relationship between fatigue crack length and critical stress intensity factor
Due to the particularity of the DCB sample,

Method used

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  • Method for evaluating critical stress intensity and sensitive factor of stress corrosion cracking for oil well pipe
  • Method for evaluating critical stress intensity and sensitive factor of stress corrosion cracking for oil well pipe
  • Method for evaluating critical stress intensity and sensitive factor of stress corrosion cracking for oil well pipe

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Embodiment

[0049] Take an example of anti-sulfur oil well pipe K 1SCC The index evaluation is taken as an example to illustrate the implementation effect of the present invention. The NACE TM0177-96 Method D standard DCB sample is used (machined mountain-shaped notch cracks are used, no fatigue cracks are prefabricated), and the actual measured dimensions of the DCB sample are listed in Table 1:

[0050] Bn

[0051] Carry out wedge splitting loading on the sample, soak in H according to IRP requirements 2 The S corrosion solution was taken out after 14 days, and the wedge was removed to measure the critical balance load, and the effect of the secondary fatigue crack growth on the H 2 S Stress corrosion crack front coloring, determination of crack length a f Then calculate K 1SCC value. Two sets of "quasi-static loading-unloading flexibility closed-loop curves" before and after the test obtained by applying the inventive method, see Figure 12 , Figure 13 shown.

[0052]...

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Abstract

The invention discloses a method for measuring the oil well pipe corrosion cracking critical stress intensity and sensitive factor. It adopts U-type loading hook to do static loading-unloading closed loop movement to the pin-and-hole of the twin cantilever (DCB) sample before and after the sulfide stress corrosion cracking test, makes the firmer chisel, loads the DCB perpetuity shift sample and obtains the loading and the relate curve of the shift at the same time; it quantity measures the DCB sample firmer chisel initial level loading, firmer chisel loading DCB actual cantilever shift and the critical level loading value after the test.

Description

(1) Technical field [0001] The invention relates to an evaluation method for critical stress intensity and sensitivity factors of oil well pipe stress corrosion cracking. The method is to prepare a high-strength sulfur-resistant oil well tubular double cantilever beam sample (DCB sample) on the hardware platform of a general dynamic material testing machine, and evaluate its critical stress intensity factor (hereinafter referred to as DCB sample) under sulfide stress corrosion or environmental corrosion conditions. K 1SCC index) and sensitivity factor ΔK. This method is also applicable to the detection of corrosion-resistant steel, stainless steel and other products. (2) Background technology [0002] The test method for the stress corrosion cracking resistance of oil well pipes under high sulfide service conditions has been issued by the American Society of Corrosion Engineering (NACE) A set of test standards (NACETM0177-1996), which regulates the evaluation of metals und...

Claims

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Application Information

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IPC IPC(8): G01N19/00G01N3/40G01N19/08
Inventor 方健郭金宝魏毅静蔡海燕
Owner BAOSHAN IRON & STEEL CO LTD
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