油井水泥环套管膨胀致裂的量化

IF 3.2 3区 工程技术 Q1 ENGINEERING, PETROLEUM
SPE Journal Pub Date : 2023-10-01 DOI:10.2118/218003-pa
Pablo Alberdi-Pagola, Gregor Fischer
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引用次数: 0

摘要

油气井水泥环的裂缝是一个主要问题,因为它会破坏井的完整性,导致无法控制的碳氢化合物泄漏,影响井的安全和环境。在可能引起裂缝的几个原因中,在本研究中,我们重点研究了由压力变化引起的钢套管径向膨胀作为损伤的一个具体原因。设计了一个测试装置,机械地扩展钢套管,同时摄像机监控水泥,使用数字图像相关(DIC)技术检测和测量裂缝。六个9-5/8英寸的全尺寸复制品。对油井截面进行了测试,并对水泥裂缝进行了量化,裂缝宽度从10µm到500µm不等。虽然每个试样都表现出独特的裂纹模式,但在测量的裂纹宽度上没有明显的趋势,但对裂纹区域的分析显示出明显的模式。在所有试样中,裂纹面积表现出:(1)套管径向膨胀在0 ~ 100 μ m范围内快速增长,达到15 mm²左右的裂纹面积值;(ii)套管径向膨胀在100µm和250µm之间逐渐缓慢增加,达到25 mm²的开裂区域;(iii)相对恒定的裂纹面积稳定在约25 mm²,超过250 μ m的径向膨胀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantification of Casing Expansion-Induced Cracking in Oilwell Cement Sheaths
Summary Cracking in the cement sheath of oil and gas wells is a major concern because it compromises well integrity and can lead to uncontrolled leaks of hydrocarbons, affecting both well safety and the environment. Among several reasons that might induce cracking, in the present study, we focus on the radial expansion of the steel casing resulting from pressure changes as one specific cause of damage. A test setup was designed to mechanically expand the steel casing while cameras monitored the cement to detect and measure cracking using digital image correlation (DIC) techniques. Six full-size replicas of 9-5/8-in. oilwell cross-sections were tested, and cracks in the cement ranging from 10 µm to 500 µm in width were quantified. Although each specimen exhibited a unique cracking pattern without a clear trend in the measured crack widths, analysis of the crack areas revealed a distinct pattern. Across all specimens, the cracked area showed (i) rapid growth at casing radial expansions between 0 µm and 100 µm, reaching cracked area values around 15 mm²; (ii) a gradually slower increase at casing radial expansions between 100 µm and 250 µm, reaching cracked areas up to 25 mm²; and (iii) a relatively constant cracked area stabilizing at approximately 25 mm² beyond radial expansions of 250 µm.
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来源期刊
SPE Journal
SPE Journal 工程技术-工程:石油
CiteScore
7.20
自引率
11.10%
发文量
229
审稿时长
4.5 months
期刊介绍: Covers theories and emerging concepts spanning all aspects of engineering for oil and gas exploration and production, including reservoir characterization, multiphase flow, drilling dynamics, well architecture, gas well deliverability, numerical simulation, enhanced oil recovery, CO2 sequestration, and benchmarking and performance indicators.
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