Potential of Nitrogen Gas Miscible Injection in South East Assets, Abu Dhabi

Abstract

This study evaluated the potential for application of miscible nitrogen injection to South East assets in Abu Dhabi which include three giant onshore oil fields. MMP (Minimum miscibility pressure) for different N2- oil systems was determined as a key criterion for screening. CMG simulation and correlations approaches were employed for determining pure N2 MMP. Results of the study demonstrated that pure nitrogen miscible injection is promising for some reservoirs in the SE fields when reservoir pressure is higher than the MMP. Different correlations have been investigated for suitability to Abu Dhabi crude oils. Investigated MMP correlations are applied to the available data sets and a comprehensive error analysis is performed based on a comparison of the predicted value using published correlations with the simulated value using CMG simulator. Two simulation methods were employed to calculate MMP's: cell to cell and key tie line. The Hudgins and Sebastian correlations are in a good agreement with the simulated MMP indicated by small absolute deviation of 10.9% and 2.9% respectively. Glaso, Hanssen, and Firoozabadi correlations produced unrealistic results. The impact of critical parameters such as C1 fraction, C2-C5 fraction, and molecular weight of C7+, API, and temperature on the MMP of nitrogen injection was investigated.

The effect of impurity on miscible CO2displacement mechanism

“…But the toxicity of H 2 S limits its widespread application. On the other hand, the mixture of CO 2 and N 2 , so-called flue gas, is used to drive the crude oil for EOR and receives extensive attention (Abrishami and Hatamian, 1996;Bahralolom and Orr, 1988;Belhaj et al, 2013b;Fandino et al, 2015;Firoozabadi and Aziz, 1986;Srivastava and Huang, 1997). In a word, the presence of CH 4 , H 2 S and N 2 in the CO 2 stream alters phase behavior of the reservoir oil and injected gas system, which influences extremely displacement mechanism and recovery efficiency.…”

A novel method of bidirectional displacement with artificial nitrogen gas cap and edge water for enhanced oil recovery: Experimental and simulation approaches

“…Nitrogen (N 2 ) injection has been used worldwide since the mid-1960s as a secondary or tertiary recovery method, which maintains pressure to enhance oil recovery in different lithological reservoirs (Bujanos et al, 2005;Sinanan and Budri, 2012;Wu et al, 2013). There are more benefits for nitrogen injection, for example, non-corrosive factor, availability of onsite nitrogen gas production, and lower production or operation cost by cryogenic air separation (Belhaj et al, 2013). Inert and non-corrosive nitrogen do not absorb on matrix surface of reservoir rock or alter the rock's wettability in low-permeability reservoirs (Yu and Sheng, 2016).…”

Accurate determination of the CO2‐crude oil minimum miscibility pressure of pure and impure CO2 streams: A robust modelling approach

“…The decrease of primary production in conventional and unconventional oil recovery has led to rapid development of a variety of techniques and enhanced oil recovery (EOR) processes to extract residual oil prior to abandoning the reservoir . In general, EOR techniques are categorized into four main classes: gas injection, chemical flooding, thermal processes, and microbial flooding.…”

“…T he decrease of primary production in conventional and unconventional oil recovery has led to rapid development of a variety of techniques and enhanced oil recovery (EOR) processes to extract residual oil prior to abandoning the reservoir. [1][2][3][4] In general, EOR techniques are categorized into four main classes: gas injection, chemical flooding, thermal processes, and microbial flooding. Gas injection is widely used for enhanced oil recovery processes, contributing to higher oil recovery by injecting various gases such as carbon dioxide, natural gas, nitrogen, enriched natural gas, or flue gas into the oil reservoir.…”