2021-12-13
LI Jinzhi1
1. Oil and Gas Development Management Center, Shengli Oilfield Company, SINOPEC, Dongying 257001, Shandong Province, China
Abstract: Considering the complexity of optimizing well spacing with component numerical simulation and the insufficiency of capturing reservoir heterogeneity and crude-oil viscosity changing with space in CO2 flooding with conventional calculation methods of critical well spacing, the relationship between the threshold pressure gradient (TPG) and the air permeability of low-permeability reservoirs in Shengli Oilfield is obtained by regression through a large number of laboratory experiments. Based on the non-Darcy flow theory and considering the reservoir heterogeneity, the reduced viscosity of crude oil by CO2 flooding, convection, diffusion, and adsorption, a mathematical model of injector–producer pressure difference of line well pattern in CO2miscible flooding is established, and the methods for determining the critical flow well spacing and the reasonable production-well spacing are proposed. With a low-permeability reservoir in Shengli Oilfield taken as an example, the critical flow well spacing for CO2 miscible flooding is calculated. The results indicate that when the permeability increases to a certain value, the TPG stably decreases with the growth of permeability. When the apparent permeability decreases to a certain value, the TPG soars with the decline in permeability. For the low-permeability reservoirs in Shengli Oilfield, with the increase in the injector–producer pressure difference, the reasonable production-well spacing gradually rises, and the calculated reasonable production-well spacing is consistent with the actual injector–producer spacing, which verifies the reliability of the calculation method in this paper.
Golden Tulip Shanghai Hongqiao Yankuang Hotel Secures China Eastern Airlines Ground Service Department Project
Hive Commercial Technology Co., Ltd. and Its E-Commerce Brand "Hive Select" Officially Authorized by Prosus N.V.
China’s Nantong Textile Titan Poised to Shine in Cape Town!
CEA's Broader Expansion into Italy Opens a New Chapter of China-Italy Aviation Cooperation
Redefining the Future of Sports: Xtep and Unitree Technology Showcase China's New Speed in Running and Technology
Global Times: Japanese organization fights for justice, demands its government to apologize and compensate ‘comfort women’ survivors
©copyright 2009-2020 Diet Tips Daily