页岩水化微观作用力定量表征及工程应用

发布时间：2018-10-16 12:28

【摘要】：以四川盆地志留系龙马溪组和鄂尔多斯盆地三叠系延长组页岩为研究对象,从微观作用力的角度分析页岩水化机理,进行水合力的定量表征,并开展矿场应用。选取了与伊利石组成和性质都极为相似的白云母进行微观作用力测试。结果显示云母片在电解质溶液中的微观作用力主要包括DLVO(Derjaguin-Landau-Verwey-Overbeek)力和水合力。当电解质浓度较低时,测试曲线符合DLVO理论;但当电解质浓度大于临界值且云母片间距小于5 nm左右时,测试曲线完全偏离DLVO理论曲线,水合力开始占据主导作用。定量计算表明水合力强度随作用距离增加呈双指数型衰减。矿场应用表明,严格控制水相侵入并降低水合力强度是防塌钻井液体系设计的关键;压后焖井过程中充分利用页岩水化致微裂缝萌生、扩展可进一步改造页岩储集层。
[Abstract]:The shale of the Silurian Longmaxi formation and the Triassic Yanchang formation in Sichuan Basin is taken as the research object. The hydration mechanism of shale is analyzed from the point of view of microcosmic force, the quantitative characterization of water force is carried out, and the field application is carried out. Muscovite, which is very similar to Illite in composition and property, was selected for microcosmic force test. The results show that the microcosmic force of mica in electrolyte solution mainly includes DLVO (Derjaguin-Landau-Verwey-Overbeek) force and water force. When the electrolyte concentration is low, the test curve accords with the DLVO theory, but when the electrolyte concentration is larger than the critical value and the distance of mica chip is less than 5 nm, the test curve completely deviates from the DLVO theory curve, and the water force begins to dominate. The quantitative calculation shows that the strength of the water force decreases with the increase of the action distance. The field application shows that strictly controlling water phase invasion and reducing the strength of water force is the key to the design of anti-sloughing drilling fluid system, and the hydration of shale can be fully used in the process of braising well, which can further transform the shale reservoir.
【作者单位】：油气藏地质及开发工程国家重点实验室西南石油大学;中国石油西南油气田公司工程技术研究院;
【基金】：国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061) 国家自然科学基金(51674209) 国家重点基础研究发展计划(973)项目(2013CB228003)
【分类号】：TE311

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