Reserch On Feasibility Of CO₂Flooding And Storage Technology Application In Junggar Basins Heavy Oil Reservoir

The technology of CO2flooding and storage is the most cost-effective measure to realize the reduction of greenhouse gas emission and solve the environment problems at this stage. The heavy oil reservoir have rich resources with wide developing prospect for its tourism resources. Several thin oil fields tested in the field and scored initial success of CO2flooding at present, but the application which of the technology of CO2flooding and storage for the heavy oil reservoir seldom used. Also, whether or not this technology apply to the viscous oil reservoir haven’t been deep research. Xinjiang possesses rich heavy oil reservoir resources, and this can be the foundation for the feasibility study of CO2flooding and storage. It is of strategic importance of Junggar Basins by using the technology of CO2flooding and storage.Based on the extensive investigation and experimental research, the researches of the filtering system research of CO2flooding of heavy oil reservoir, mechanism of CO2flooding and storage, indoor experimental evaluation, phase behavior study, numerical simulation, the forecast of development effect and economic feasibility evaluation were presented in this paper. This paper set up a impeccable system of CO2flooding to enhanced oil recovery of heavy oil reservoir and storage technology feasibility study evaluation system.The main work and results obtained from the researches are summarized as follows:(1) Based on the fuzzy analytical hierarchy process and combined screening criteria and parameters selection of gas injection reservoir by different scholars to evaluate the screening and introducing a new parameter, membership, hierarchy and weight calculation of the influence factors of the effect of gas injection and the fuzzy judgment model which suitable of the heavy oil reservoir was set up for gas injection flooding suitability evaluation. Systematic screened the carboniferous system of heavy oil reservoir in Junggar basins.(2) Based on the reserch of the mechanism of CO2flooding and storage, the main factors influenced CO2storage and the type of reservoir were revealed. Three kinds of CO2storage potential model were set up to assessed the CO2storage potential of9carboniferous block: Ecofys evaluation model, the dissolve volume model, the corrected dissolve volume model. These three kinds of model all fits the reservoir, and this paper recommend the corrected dissolve volume model for assessment of CO2storage potential of heavy oil reservoir model.(3) By the evaluation experiment of CO2flooding, several research were presented in this paper, such as PVT phase behavior test of reservoir crude oil system, gas injection expansion experiment, slim tube experiment, stratigraphic oil injection CO2long-core experiment. The evaluation method of CO2flooding of heavy oil reservoir integrated indoor experimental were set up with system experiment scheme design and the suitability evaluation.(4) By fitting the experimental data of crude oil of high voltage PVT calculation, the critical parameters which can reflect the change of state of actual formation fluid properties can be evaluated. The formation fluid infusion of CO2multi contact pseudo-ternary phase diagrams of CO2three simulation and injection gas tube experiment, determined the formation fluid infusion of CO2minimum miscibility pressure, which depends on the High temperature and high pressure in formation fluid properties and gas expansion experiment fitting. (5) According to the reservoir geology and development profile, a numerical model is established and the production lasted fitting; based on the history matching, simulation study of depletion development, gas injection and the effect of water flooding, and also analysis of the gas injection layer, gas injection rate, single well gas injection, gas injection slug of gas injection development parameters and so on, according to the results of the analysis, given the initial parameters of the proposed optimization.(6) Through predicting the Junggar Basin development effect of zone Ninel-Nine5of Carboniferous heavy oil reservoir, for us to solve the CO2flooding failure mode between production gas production process increment and injection of CO2storage. According to the Junggar Basin’s zone Ninel-Nine5of Carboniferous heavy oil reservoir whose economic evaluation analysis can improve the feasibility for CO2flooding and storage technology.(7) Filtering system research of CO2flooding of heavy oil reservoir, mechanism of CO2storage, Indoor experimental evaluation, phase behavior study, numerical simulation research, the forecast of development effect and economic feasibility evaluation were presented in this paper and a full system of CO2flooding to enhanced oil recovery of heavy oil reservoir and storage technology feasibility study evaluation system were also set up.This paper establishes a assessment system of CO2flooding and strorage in heavy oil reservoir, the research results enriched the theoretical basis and has important practical significance.