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摘要? 巖溶型地?zé)衢_(kāi)采過(guò)程中，儲(chǔ)層內(nèi)的水巖反應(yīng)會(huì)改變儲(chǔ)層孔滲，影響系統(tǒng)產(chǎn)能。為探究巖溶型熱儲(chǔ)開(kāi)采過(guò) 程中水巖反應(yīng)對(duì)孔滲演變的作用機(jī)制，搭建了考慮孔隙變形的碳酸鹽巖熱流化多場(chǎng)耦合模型。揭示了熱流化耦合作用下水巖反應(yīng)對(duì)儲(chǔ)層孔滲演變的作用機(jī)制，研究了孔滲參數(shù)的演變特征及其演變對(duì)系統(tǒng)取熱性能的影響。結(jié)果表明：欠飽和注入下，注入井和波及前沿區(qū)域發(fā)生溶解反應(yīng)，中間區(qū)域發(fā)生沉淀反應(yīng)，致使儲(chǔ)層濃度和孔隙度呈環(huán)狀分布。開(kāi)采30 年時(shí)，注入井處孔隙度和滲透率分別增大了19.3% 和73.6%，生產(chǎn)井處分別降低了0.11% 和0.32%；考慮孔隙變形案例的注采壓差比不考慮孔隙變形案例低21.7%。本研究可為碳酸鹽巖巖溶型熱儲(chǔ)產(chǎn)能的精確預(yù)測(cè)和開(kāi)發(fā)方案優(yōu)化提供參考依據(jù)。

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關(guān)鍵詞 ：巖溶型熱儲(chǔ),演變特征,水巖作用,孔滲參數(shù),取熱性能

Abstract：

Water-rock reactions within the reservoir during karst-based geothermal exploitation can lead to variation of porosity and permeability, affecting the system's thermal performance. A multi-field coupled thermal-hydraulic-chemical model considering the pore changes was developed to investigate the mechanism of water-rock reaction on the evolution of pores and permeability during the production process of karst-based geothermal reservoirs. The mechanism of water-rock reaction on reservoir pore-permeability evolution under thermal-hydraulic-chemical coupling is revealed, and the evolutionary characteristics of pore-permeability parameters and their evolutionary impact on the system heat extraction performance are investigated. The results show that under undersaturated injection conditions, the concentration and porosity distribution present a ring shape, which is caused by dissolution reactions occurring in the injection wells and swept front regions, and precipitation reactions occurring in the intermediate regions. After 30 years of production, the porosity and permeability at the injection wells increased by 19.3% and 73.6%, respectively, and the porosity and permeability at the production wells decreased by 0.11% and 0.32%, respectively. The injection-production differential pressure of the case considering pore deformation was 21.7% lower than that of the case without considering pore deformation. This study is instructive for the accurate prediction of carbonate karst-based reservoir production and development program optimization.

Key words： karst-based thermal reserve; evolutionary characteristics; water-rock reaction; pore-permeability parameters; heat extraction performance

收稿日期: 2024-10-31 ????

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基金資助:國(guó)家自然科學(xué)基金重大項(xiàng)目課題“高溫巖石動(dòng)態(tài)損傷機(jī)理與高效破碎方法”(52192624) 資助

通訊作者: [email protected]

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姬佳炎, 宋先知*, 易俊琳, 李根生, 王高升. 巖溶型地?zé)豳Y源開(kāi)采過(guò)程水巖反應(yīng)對(duì)儲(chǔ)層孔滲演變影響研究. 石油科學(xué)通報(bào), 2024, 09(05): 737-749 JI Jiayan, SONG Xianzhi, YI Junlin, LI Gensheng, WANG Gaosheng. Study of the effect of water-rock reaction on reservoir pore-permeability evolution during exploitation of karst geothermal resources. Petroleum Science Bulletin, 2024, 09(05): 737-749.

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