Hakodate Conv. of JPI (51st Petroleum-Petrochemical Symposium of JPI)

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Natural resource exploitation

[2E13-17] Natural resource exploitation(2)

Fri. Nov 12, 2021 2:45 PM - 4:00 PM Room-E (Stadio-A/Hakodate Areana)

Chair:Hiroyuki Nakagawa(Japan Petroleum Exploation Co., Ltd.)

2:45 PM - 3:00 PM

[2E13] A coupled geochemical model to predict oil recovery during low salinity waterflooding

○Yogarajah Elakneswaran1 (1. Hokkaido University)

In this study, the interface characteristics of crude oil/brine and rock/brine was coupled with a solute transport model to simulate low salinity waterflooding in both carbonate and sandstone reservoirs. The ionic transport and two-phase flow of oil and water equations were solved and coupled with IPhreeqc for geochemical calculations. The coupled model allows to predict spatiotemporal variation of ionic profiles, surface and zeta potentials, minerals changes, total disjoining pressure, and wettability index in addition to oil recovery in carbonate and sandstone reservoirs. The coupled model was validated and verified with the published experimental data for core flooding experiments.

3:00 PM - 3:15 PM

[2E14] Study on an enhanced oil recovery technique using foam generating microorganism

○Miu Ito1, Yuichi Sugai1 (1. Kyushu University)

Pseudomonas aeruginosa grows by nitrate respiration and generate nitrogen gas and proteins that form foam in culture solution under anaerobic conditions. In this study, we investigated the possibility of an enhanced oil recovery technique using the foam in situ generated by the microorganism. It was found that a small amount of iron is essential for foam production by the microorganism, and that foam can be easily produced by cultivating the microorganism in the culture medium consisting from molasses and reservoir brine that contain sufficient iron without preparing special culture media.

3:15 PM - 3:30 PM

[2E15] Investigation of wettability alteration effect by SiO2 nanoparticle dispersions with different particle size

○Keisuke Negishi1, Kazunori Abe1 (1. Akita University)

SiO2ナノ粒子を用いた油増進回収法に関する研究において、岩石表面の濡れ性改質による増油効果が主要な増油機構として挙げられる。先行研究において、岩石表面の濡れ性改質による一定の増油効果が報告されている一方で、SiO2ナノ粒子の粒子径に着目した研究報告が少ない。本研究では、粒子径の異なるSiO2ナノ粒子分散液を用いてAmott法を主体とした試験を実施し、SiO2ナノ粒子の粒子サイズが濡れ性改質作用に与える影響を検討した。

3:30 PM - 3:45 PM

[2E16] Mitigation of Selective Corrosion of Duplex Stainless Steels Tubing in Acidizing

○Hirotaka Mizukami1, Ayano Yasui1, Susumu Hirano1, Toshiyuki Sunaba1 (1. INPEX Corp.)

石油・天然ガス開発において、坑井の生産性改善のため坑井内に酸を注入する酸処理が行われる。酸には強酸が使用されることが多いため、腐食抑制剤が添加される。しかし、優れた耐食性を有する二相ステンレス鋼は酸処理環境下で選択溶解が発生することが知られており、本報告では腐食抑制剤に助剤を添加することで選択腐食の抑制を試みた。助剤として銅化合物を添加した結果、腐食速度の大幅な減少と選択腐食の抑制が確認された。

3:45 PM - 4:00 PM

[2E17] Investigation on acid wormholing in carbonate reservoirs

○Kenji Furui1, Tomoaki Ishiwata2, Yoshihiro Tsuchiya2, Yoshiharu Ito2 (1. Waseda University, 2. Japan Oil, Gas and Metals National Corporation )

Matrix acidizing is one of the most popular well stimulation techniques in oil and gas developments. It has been reported from many carbonate reservoirs around the world that high-rate matrix acidizing treatments create highly conductive flow paths called wormholes, which can significantly improve the well productivity/injectivity. In this presentation, we discuss fundamental mechanisms of wormhole formation and growth based on experimental and numerical study results.
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