Injection of Acid Gas Mixtures in Sour Oil Reservoirs: Analysis of Near-Wellbore Processes with Coupled Modelling of Well and Reservoir Flow
Injection of Acid Gas Mixtures in Sour Oil Reservoirs: Analysis of Near-Wellbore Processes with Coupled Modelling of Well and Reservoir Flow
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DOI：
10.1007/s11242-010-9685-6
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发表时间：
2011-10
影响因子：
2.7
通讯作者：
A. Battistelli;P. Ceragioli;M. Marcolini
中科院分区：
文献类型：
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作者：
A. Battistelli;P. Ceragioli;M. Marcolini
为了开采含有显著量的酸性气体（H2S和CO2）的烃储层，经常需要重新注入酸性或酸性气体混合物，以减少油田开采的环境影响，并为提高石油采收率（EOR）目的提供压力支持。地质结构中的酸性和酸性气体注入可以用TMGAS建模，TMGAS是TOUGH 2储层模拟器的新状态方程（EOS）模块。TMGAS可以模拟以NaCl为主的盐水与非水（NA）相平衡的两相行为，非水（NA）相由CO2和H2S等无机气体和碳氢化合物（纯组分和假组分）组成，高达深层沉积盆地中发现的高压（~100 MPa）和高温（~200°C）。这项研究的重点是在一个假设的高压，欠饱和的酸油油藏在井扇区规模和条件下，注入的气体是完全混溶的油注入酸性气体混合物驱动的近井眼过程。相关耦合过程进行了模拟，包括驱油原来的地方，原生盐水的蒸发，盐的浓度和随之而来的岩盐沉淀，以及非等温效应所产生的注入的酸性气体混合物的温度低于初始油藏温度。非等温效应的研究，通过模拟在一个耦合的方式井筒和油藏流动与修改版本的TOUGH 2油藏模拟器。所描述的方法限于当在高压地质结构中注入酸、酸或温室气体混合物时发生的单相井筒流动条件。
The reinjection of sour or acid gas mixtures is often required for the exploitation of hydrocarbon reservoirs containing remarkable amounts of acid gases (H2S and CO2) to reduce the environmental impact of field exploitation and provide pressure support for enhanced oil recovery (EOR) purposes. Sour and acid gas injection in geological structures can be modelled with TMGAS, a new Equation of State (EOS) module for the TOUGH2 reservoir simulator. TMGAS can simulate the two-phase behaviour of NaCl-dominated brines in equilibrium with a non-aqueous (NA) phase, made up of inorganic gases such as CO2and H2S and hydrocarbons (pure as well as pseudo-components), up to the high pressures (~100 MPa) and temperatures (~200°C) found in deep sedimentary basins. This study is focused on the near-wellbore processes driven by the injection of an acid gas mixture in a hypothetical high-pressure, under-saturated sour oil reservoir at a well-sector scale and at conditions for which the injected gas is fully miscible with the oil. Relevant-coupled processes are simulated, including the displacement of oil originally in place, the evaporation of connate brine, the salt concentration and consequent halite precipitation, as well as non-isothermal effects generated by the injection of the acid gas mixture at temperatures lower than initial reservoir temperature. Non-isothermal effects are studied by modelling in a coupled way wellbore and reservoir flow with a modified version of the TOUGH2 reservoir simulator. The described approach is limited to single-phase wellbore flow conditions occurring when injecting sour, acid or greenhouse gas mixtures in high-pressure geological structures.