Numerical Simulation Study on Pulsed Gas Injection Using Orthogonal Analysis
Oil reservoirs having discovered recently and those having not put into development domestically are mainly low permeability or even ultra-low permeability reservoirs that are difficult to exploit, moreover, the exploitation is becoming increasingly difficult. Carbon dioxide injection has become a promising EOR approach since it is cost-effective and can achieve remarkable results, moreover, carbon dioxide can be used repetitively and has good miscibility with crude oil. Most of the sandstone reservoirs implementing gas injection are ultra-low-permeability reservoirs inland, to prevent the injected gas from breakthrough prematurely, the most realistic method is to implement pulsed gas injection, and it has already been applied in Fang 48 area. F180-129 well group of Fang 48 fault block is selected to simulate study profile adjusting using pulsed gas injection after gas breakthrough, and the orthogonal analysis is adopted to optimize the parameters of pulsed gas injection, such as pulsed cycle and gas injection volume. The parameters of the best scheme obtained are as follows: Gas injection time is 4 months, Stopping time is 1 month and gas injected volume per cycle is 0.02 HCPV. Based on the scheme obtained, the optimum pulsed timing is analyzed and research results show that, pulsed gas injection of F180-129 well group will obtain the best effectiveness when it is implemented after gas breakthrough occurs in 1 well or 2 wells, it will achieve higher oil replace ratio as well as higher recovery factor then.
KeywordsLow-permeability oil reservoir pulsed gas injection numerical simulation orthogonal analysis
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