功能性石墨烯量子点起泡剂的制备及性能

Development and Performance Evaluation of Functionalized Graphene Quantum Dots Foaming Agent

摘要:

为制备一种稳泡能力较强，降黏与起泡能力优异的石墨烯量子点（GQDs）型起泡剂，采用柠檬酸水热法制备GQDs固体，经皮克林法对其进行γ-甲基丙烯酰氧基丙基三甲氧基硅烷偶联剂（γ-MPS）功能改性，制备两亲石墨烯量子点型起泡剂（D12-5-GQDs）。采用FTIR、纳米粒度电位仪、UV-Vis对D12-5-GQDs进行结构表征和性能测试，通过评价静动态吸附量、界面张力、起泡高度和分流率等参数，阐明不同实验条件下D12-5-GQDs的发泡能力、稳泡剂协同特性，以及降黏调驱等能力。结果表明，温度31℃时，质量分数0.1%的D12-5-GQDs体系起泡能力最佳，15 min内携液量可达187 mL；D12-5-GQDs应用范围在30~350 ℃，质量分数0.1%的D12-5-GQDs水溶液在350 ℃时起泡体积仍能超过200 mL；对比行业标准D12-5-GQDs抗吸附能力较强，平衡吸附量为0.18 mg/g(砂)；质量分数0.1%的D12-5-GQDs溶液调驱能力较好，级差4.61与16.6对应的高低渗最终分流率比值分别为61∶38和70∶29；D12-5-GQDs在0.5 PV的注入量下就可迅速起效调驱，并在1.5 PV左右令分流率趋于稳定。

Abstract:

To prepare a graphene quantum dot (GQDs) foaming agent with strong foam stability, excellent viscosity reduction and foaming ability. GQDs solid was prepared by citric acid hydrothermal method, and modified with γ-methacryloyloxypropyltrimethoxysilane coupling agent (γ-MPS) by Pickering method to prepare amphiphilic graphene quantum dot foaming agent (D12-5-GQDs). Structural characterization and performance testing of D12-5-GQDs were performed using FTIR, nanoparticle potentiometry, and UV Vis. By evaluating parameters such as static and dynamic adsorption capacity, interfacial tension, foaming height, and flow rate, the foaming ability, foam stabilizer synergistic characteristics, and viscosity reduction and displacement control capabilities of D12-5-GQDs under different experimental conditions are elucidated. The results showed that the D12-5-GQDs system with a reservoir temperature of 31 ℃ and a mass fraction of 0.1% had the best foaming ability, and the liquid carrying capacity could reach 187 mL within 15 minutes. The application range of D12-5-GQDs is 30-350 ℃, and the foaming volume of a 0.1% mass fraction of D12-5-GQDs aqueous solution can still exceed 200 mL at 350 ℃. Compared to the industry standard D12-5-GQDs, D12-5-GQDs have stronger anti adsorption ability, with an equilibrium adsorption capacity of only 0.18 mg/g (sand). The D12-5-GQDs solution with a mass fraction of 0.1% has good displacement control ability, and the ratio of high and low permeability final diversion rates corresponding to a gradation of 4.61 and 16.6 is 61:38 and 70:29, respectively; D12-5-GQDs can quickly take effect at an injection volume of 0.5 PV and stabilize the diversion rate at around 1.5 PV.