Development of New Oil Recovery Process Controlling Formation of Polymer Gel in Reservoirs

控制油藏聚合物凝胶形成的采油新工艺开发

• 批准号: 10650914
• 负责人: MASUDA Yoshihiro
• 金额: $ 2.24万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650914/
• 关键词: petroleum engineering; polymer; gel; rheology; porous media

CAG (COィイD22ィエD2-Water Alternating Gelant Injection Process) is proposed as a new scheme of in-situ polymer gelation in reservoirs. It is comprised of alternate injection of the two solutions : saturated aqueous carbon dioxide and gelant (aqueous solution of polyacrylamide, NaAlOィイD22ィエD2 and NaOH).To design and evaluate the CAG laboratory experiments were performed. The optimum concentrations of polyacrylamide, NaAlOィイD22ィエD2 and NaOH in gelant were selected from beaker tests. The experiments using glass-bead packed cores revealed that the CAG was able to form gel and reduce the core permeability by about 1/60 to 1/360 of its original permeability. Flood experiments with linear cores and with two linear cores of different permeabilities mounted in parallel showed that the CAG was also effective to increasing oil recovery. Two-dimensional models packed with glass beads were built to investigate the effect of crossflow between layers on the CAG. The control of gel placement was found to be difficult when strong crossflow existed. An appropriate injection scheme considering the permeability ratio must be selected when the CAG is applied to reservoirs consisting of different-permeability layers.Regarding to modeling study, a numerical model was developed for predicting flow behavior accompanying gel formation in porous media. The model calculations were able to reproduce the experimental results by matching the rate constant of gel formation.The proposed CAG is a simple and promising method to recover remaining oil from matured reservoirs. The further study on injection scheme to control gel formation is recommended for its field application.

提出了一种新的油藏聚合物原位成胶方案-该方法由交替注入饱和CO2水溶液和胶凝剂（聚丙烯酰胺水溶液、NaAlO水溶液、D22水溶液、D2水溶液和NaOH水溶液）组成。通过烧杯实验，筛选出胶凝剂中聚丙烯酰胺、NaAlO_（22）Al_（22）D_2和NaOH的最佳浓度。用玻璃珠填充的岩心进行的实验表明，CAG能够形成凝胶并使岩心渗透率降低约1/60至1/360其原始渗透率。线性岩心驱油实验和两个不同渗透率的线性岩心并联驱油实验表明，CAG也能有效地提高采收率。建立了填充玻璃微珠的二维模型，研究了层间错流对CAG的影响。发现当存在强的错流时，凝胶放置的控制是困难的。针对不同渗透率的储层，必须根据渗透率比选择合适的注入方案。在模型研究方面，建立了预测多孔介质中凝胶形成过程中渗流行为的数值模型。模型计算结果与实验结果吻合较好，表明该方法是一种简单可行的开采成熟油藏剩余油的方法。建议进一步研究控制成胶的注入方案，以利于现场应用。

项目成果

李元圭: "ポリマー架橋処理による油浸攻率改善に関する基礎研究"平成10年度石油技術協会 春季講演会要旨集. 159 (1998)

Won-kyu Lee：“通过聚合物交联处理提高石油渗透率的基础研究”1998年石油技术协会春季讲座摘要159（1998）。

李元圭: "ポリマー架橋処理の油増産回収への適用可能性"平成12年度石油技術協会 春季講演会要旨集. 138 (2000)

Won-kyu Lee：“应用聚合物交联处理提高石油产量和采收率的可能性”2000 年石油技术协会春季讲座摘要 138 (2000)。

Yoshihiro MASUDA, Wonkyu Lee et al.: "In-Situ Polymer Gelation for Improving Permeability Profile - Influence of Viscous Crossflow"Abstr. 1999 Tech. Meet. Jpn. Assoc. Pet. Technol.. 141 (1999)

Yoshihiro MASUDA、Wonkyu Lee 等人：“用于改善渗透率剖面的原位聚合物凝胶化 - 粘性错流的影响”摘要。

Wonkyu Lee, Yoshihiro MASUDA et al.: "Applicavility of In-Situ Gelation Method to Improved Oil Recovery"Abstr. 1999 Tech. Meet. Jpn. Assoc. Pet. Technol.. 138 (2000)

Wonkyu Lee、Yoshihiro MASUDA 等：“原位凝胶化方法在提高石油采收率中的应用”摘要。

近田行人: "ポリマー架橋処理による浸透率プロファイルの改善 -粘性クロスフローの影響"平成11年度石油技術協会 春季講演会要旨集. 141 (1999)

Yukito Chikada：“通过聚合物交联处理改善渗透率剖面 - 粘性错流的影响”1999 年日本石油技术学会春季会议摘要 141 (1999)。