致密砂砾岩与CO2和水相互作用规律研究
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1.中国石化西南油气分公司工程技术研究院;2.长庆油田分公司工程监督处;3.油气藏地质与开发工程国家重点实验室

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TE357

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四川省科技计划项目“深部咸水层CO2地质封存与防灾研究”(2022YFSY0007);四川省国际科技创新合作项目“玄武岩地层CO2加速矿化封存机制及关键技术”(2023YFH0005)。第一作者及通讯作者:张玉龙(1992-),男,汉族,四川眉山,博士,研究方向:提高采收率理论与技术,E-mail:563197326@qq.com。 施雷庭2 兰 林1 潘宝风1 邹天赐1 张言亮3 王 晓2


Study on the interaction pattern of dense gravels with CO2and water
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Engineering Technology Research Institute of Sinopec Southwest Oil and Gas Company

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    摘要:

    为研究吉致密砂砾岩与CO2和水相互作用规律,基于准噶尔盆地玛湖致密砂砾岩油藏储层条件,开展致密砂砾岩与CO2和水相互作用实验。结果表明:CO2溶于水后生成碳酸主要与致密砂砾岩砾石间胶结物中长石、方解石发生化学作用,形成强烈的绕砾溶蚀现象,以溶蚀为主,沉淀为辅,最终使岩石孔隙度和渗透率增加,储层流体渗流能力变强,其中孔隙度和渗透率最大增量分别为3.65%和87.36%。同时,作用后岩石表面粗糙度增加,亲水矿物石英裸露在表面,岩石水相润湿接触角降低7.4°亲水性增强。对CO2吞吐提高原油采收率具有积极作用,主要增油机理包括以下两点:一是增大孔隙空间提高流体渗流能力;二是改善岩石水相润湿性,提高油藏水相渗吸能力和原油流动能力,从而提高原油采收率。

    Abstract:

    In order to study the interaction law of Ji dense conglomerate with CO2 and water, based on the reservoir conditions of Mahu dense conglomerate reservoir in Junggar Basin, we carried out experiments on the interaction of dense conglomerate with CO2 and water. The results show that CO2 dissolved in water generates carbonic acid, which mainly interacts chemically with feldspar and calcite in the intergranular cement of dense conglomerate to form a strong erosion phenomenon around the gravel, which is dominated by erosion and supplemented by sedimentation, and ultimately increases the rock porosity and permeability, and strengthens the seepage capacity of reservoir fluids, with the maximum increment of porosity and permeability being 3.65% and 87.36%, respectively. At the same time, the roughness of the rock surface increased after the action, the hydrophilic mineral quartz was exposed on the surface, and the hydrophilicity of the rock was enhanced by decreasing the wetting contact angle of the water phase by 7.4°. It has a positive effect on CO2 throughput to improve crude oil recovery, and the main oil increase mechanism includes the following two points: one is to increase the pore space to improve the fluid seepage capacity; and the other is to improve the rock water-phase wettability to improve the reservoir water-phase seepage and absorption capacity and crude oil flow capacity, so as to improve the crude oil recovery.

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张玉龙,兰林,潘宝风,等. 致密砂砾岩与CO2和水相互作用规律研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-20
  • 最后修改日期:2024-06-07
  • 录用日期:2024-06-24
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