Optimisation of Sand Control Technique for Offshore Heavy Oil and Unconsolidated Sandstone Reservoir: Case Study from Bohai Bay

Chen, Sheng‐Hong; Cheng, Kun; Gokdemir, Metin; Xing, Xuesong; Zhong, Cheng

doi:10.2523/17036-ms

Cited by 7 publications

(1 citation statement)

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“…However, there is currently limited research on the compositional changes in heavy oil after the injection of hydrocarbons, , as well as the comparison of miscibility pressures. − Moreover, the density, viscosity, and composition of heavy oil are significantly influenced by gas injection, which in turn affects displacement efficiency. − To address these issues, this study investigates the effects of CO 2 , natural gas, and nitrogen injection on the heavy oil viscosity, density, expansion ratio, and compositional changes through indoor experiments. It explores the minimum miscibility pressures and displacement effects of different gases, aiming to provide insights for the selection of gas injection methods in heavy oil fields and improve the mechanisms of gas injection for enhanced heavy oil recovery. …”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Oil–Gas Interaction Mechanism during Offshore Heavy Oil Gas Injection

Zhang,

He,

Zhang

et al. 2024

ACS Omega

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Offshore heavy oil injection gas extraction is a highly scrutinized area in today's petroleum industry. However, the interaction mechanisms between oil and gas are not clear. To elucidate these mechanisms, an indoor experimental setup was established for research purposes. The effects of different types of gases on heavy oil expansion, mass transfer mechanisms between gas and heavy oil, the influence of gas injection on heavy oil phase behavior, and the testing of minimum miscibility pressures are investigated in this study. The results indicate that CO 2 yields the best reduction in the heavy oil viscosity. Both forward and backward multiple contact mass transfer processes demonstrate nonmiscible multiple contact dynamic displacement mechanisms involving CO 2 dissolution and condensation, as well as C1 extraction and coextraction. Nonmiscible multiple contact dynamic displacement of natural gas primarily involves limited dissolution and condensation of light hydrocarbon components and intermediate hydrocarbon components, with an extremely weak extraction effect. The minimum miscibility pressures are in the order of CO 2 < natural gas < N 2 . This research provides important experimental evidence and theoretical guidance for further improving offshore heavy oil injection gas technology and practice.

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