Study on the Mechanism of CO₂-Viscoelastic Fluid Synergistic Oil Displacement in Tight Sandstone Reservoirs

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CO₂-Viscoelastic Fluid Synergistic Oil Displacement in Tight Sandstone Reservoirs</title> <meta name="description" content="Study on the Mechanism of CO₂-Viscoelastic Fluid Synergistic Oil Displacement in Tight Sandstone Reservoirs"> <meta name="keywords" content="tight oil reservoir, CO₂ flooding, low interfacial tension viscoelastic fluid flooding, synergistic oil displacement, EOR mechanism"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar 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class="card-body"><strong>Paper Count:</strong> 87356</div> </div> </div> </div> <div class="card publication-listing mt-3 mb-3"> <h5 class="card-header" style="font-size:.9rem">Study on the Mechanism of CO₂-Viscoelastic Fluid Synergistic Oil Displacement in Tight Sandstone Reservoirs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Long%20Long%20Chen">Long Long Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Xinwei%20Liao"> Xinwei Liao</a>, <a href="https://publications.waset.org/abstracts/search?q=Shanfa%20Tang"> Shanfa Tang</a>, <a href="https://publications.waset.org/abstracts/search?q=Shaojing%20Jiang"> Shaojing Jiang</a>, <a href="https://publications.waset.org/abstracts/search?q=Ruijia%20Tang"> Ruijia Tang</a>, <a href="https://publications.waset.org/abstracts/search?q=Rui%20Wang"> Rui Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Shu%20Yun%20Feng"> Shu Yun Feng</a>, <a href="https://publications.waset.org/abstracts/search?q=Si%20Yao%20Wang"> Si Yao Wang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Tight oil reservoirs have poor physical properties, insufficient formation energy, and low natural productivity; it is necessary to effectively improve their crude oil recovery. CO₂ flooding is an important technical means to enhance oil recovery and achieve effective CO₂ storage in tight oil reservoirs, but its heterogeneity is strong, which makes CO₂ flooding prone to gas channeling and poor recovery. Aiming at the problem of gas injection channeling, combined with the excellent performance of low interfacial tension viscoelastic fluid (GOBTK), the research on CO₂-low interfacial tension viscoelastic fluid synergistic oil displacement in tight reservoirs was carried out, and the synergy of CO₂ and low interfacial tension viscoelastic fluid was discussed. Oil displacement mechanism. Experiments show that GOBTK has good injectability in tight oil reservoirs (Kg=0.141～0.793mD); CO₂-0.4% GOBTK synergistic flooding can improve the recovery factor of low permeability layers (31.41%) under heterogeneous (gradient difference of 10) conditions the) effect is better than that of CO₂ flooding (0.56%) and 0.4% GOBT-water flooding (20.99%); CO₂-GOBT synergistic oil displacement mechanism includes: 1) The formation of CO₂ foam increases the flow resistance of viscoelastic fluid, forcing the displacement fluid to flow 2) GOBTK can emulsify and disperse residual oil into small oil droplets, and smoothly pass through narrow pores to produce; 3) CO₂ dissolved in GOBTK synergistically enhances the water wettability of the core, and the use of viscosity Elastomeric fluid injection and stripping of residual oil; 4) CO₂-GOBTK synergy superimposes multiple mechanisms, effectively improving the swept volume and oil washing efficiency of the injected fluid to the reservoir. <iframe src="https://publications.waset.org/abstracts/146679.pdf" style="width:100%; height:400px;" frameborder="0"></iframe> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=tight%20oil%20reservoir" title="tight oil reservoir">tight oil reservoir</a>, <a href="https://publications.waset.org/abstracts/search?q=CO%E2%82%82%20flooding" title=" CO₂ flooding"> CO₂ flooding</a>, <a href="https://publications.waset.org/abstracts/search?q=low%20interfacial%20tension%20viscoelastic%20fluid%20flooding" title=" low interfacial tension viscoelastic fluid flooding"> low interfacial tension viscoelastic fluid flooding</a>, <a href="https://publications.waset.org/abstracts/search?q=synergistic%20oil%20displacement" title=" synergistic oil displacement"> synergistic oil displacement</a>, <a href="https://publications.waset.org/abstracts/search?q=EOR%20mechanism" title=" EOR mechanism"> EOR mechanism</a> </p> <a href="https://publications.waset.org/abstracts/146679/study-on-the-mechanism-of-co2-viscoelastic-fluid-synergistic-oil-displacement-in-tight-sandstone-reservoirs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/146679.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">183</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates its 16th foundational 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Study on the Mechanism of CO₂-Viscoelastic Fluid Synergistic Oil Displacement in Tight Sandstone Reservoirs