基于裂缝重构评价酸蚀对碳酸盐岩应力敏感性的影响

庞铭; 陈华兴; 唐洪明; 卢浩; 王昭

doi:10.3969/j.issn.1006-6535.2022.01.016

特种油气藏 >

2022 , Vol. 29 >Issue 1: 107 - 113

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.01.016

油藏工程

基于裂缝重构评价酸蚀对碳酸盐岩应力敏感性的影响

庞铭 ,
陈华兴 ,
唐洪明 ,
卢浩 ,
王昭

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1.中海石油(中国)有限公司天津分公司,天津 300450;
2.西南石油大学,四川成都 610500

庞铭(1990—),男,工程师,2012年毕业于西南石油大学资源勘查工程专业,2015年毕业于该校地质资源与地质工程专业,获硕士学位,现主要从事储层地质与采油工艺技术研究工作。

收稿日期: 2021-04-28

修回日期: 2021-11-15

网络出版日期: 2023-01-10

基金资助

国家自然科学基金“页岩气储层纳米尺度非均质性研究”(51674211)、“致密气藏储层干化、提高气体渗流能力的基础研究”(51534006)

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Evaluation of the Effect of Acid Erosion on Stress Sensitivity of Carbonate Rocks Based on Fracture Reconstruction

Pang Ming ,
Chen Huaxing ,
Tang Hongming ,
Lu Hao ,
Wang Zhao

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1. CNOOC Tianjin Branch, Tianjin 300450, China;
2. Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received date: 2021-04-28

Revised date: 2021-11-15

Online published: 2023-01-10

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摘要

碳酸盐岩的脆性较强,应力敏感性实验会对岩心产生不可逆破坏,导致无法利用同一岩心评价酸蚀前后的应力敏感性差异,评价结果对比性较差。针对该问题,基于裂缝重构技术建立了一套评价酸蚀对碳酸盐岩应力敏感性影响的方法,对酸蚀前后的裂缝缝面进行特征扫描并重构,利用有限元方法开展了有效应力作用下裂缝闭合规律的研究,并模拟了有效应力下酸蚀对裂缝渗流的影响,以评估裂缝中的渗透率变化。研究表明:缝面矿物组分差异导致酸液对缝面产生非均匀酸蚀,酸蚀后缝面粗糙度增加,缝面间的分形维数差异增大;在有效应力为40 MPa时,酸蚀前缝宽减小55%以上,渗透率损害率大于90%,而酸蚀后缝宽减小量小于40%,渗透率损害率小于75%,应力敏感性损害降低,即酸化压裂、酸洗有助于提高储层人造裂缝渗透性,防止裂缝闭合。该研究可为致密砂岩、页岩裂缝性储层应力敏感性损害评价提供借鉴。

关键词： 裂缝; 裂缝重构技术; 应力敏感性; 酸蚀; 有限元

本文引用格式

庞铭 , 陈华兴 , 唐洪明 , 卢浩 , 王昭 . 基于裂缝重构评价酸蚀对碳酸盐岩应力敏感性的影响[J]. 特种油气藏, 2022 , 29(1) : 107 -113 . DOI: 10.3969/j.issn.1006-6535.2022.01.016

Abstract

Carbonate rocks are highly brittle and stress sensitivity test will lead irreversible damage to the cores, resulting in the inability to evaluate the difference in stress sensitivity before and after acid erosion with the same cores and the poor comparability of evaluation results. To address this challenge, a method to evaluate the effect of acid erosion on stress sensitivity of carbonate rocks was established based on fracture reconstruction technology, the fracture surfaces before and after acid erosion were characteristically scanned and reconstructed, the finite element method was applied to study the fracture closure pattern under effective stress, and the effect of acid erosion on fracture seepage under effective stress was simulated to evaluate the variation in fracture permeability. It was found in the study that the difference in mineral components on the fracture face leads to non-uniform acid erosion on the fracture surface, making the fracture surface more rough and resulting in greater difference in the fractal dimension between the fracture surfaces; under the effective stress of 40 MPa, before the acid erosion, the fracture width decreased by more than 55% and the permeability damage rate was greater than 90%; however, after the acid erosion, the fracture width decreased by less than 40%, the permeability damage rate was less than 75%, and the stress sensitive damage decreased. In other words, acid fracturing and pickling are conducive to improving the permeability of artificial fractures and prevent fracture closure. This study can provide a reference for the evaluation of stress sensitivity damage of fractured tight sandstone and shale reservoirs.

Key words： fracture; fracture reconstruction technology; stress sensitivity; acid erosion; finite element

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