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Title:
METHOD AND DEVICE FOR DETERMINING INJECTION CAPACITY DURING ALTERNATE INJECTION OF WATER AND GAS
Document Type and Number:
WIPO Patent Application WO/2021/022684
Kind Code:
A1
Abstract:
A method and a device for determining the injection capacity during the alternate injection of water and gas. The method comprises: in each preset interval, selecting the equivalent length of fluids in the capillary according to the geometry of the capillary and the start time of the current interval and determining whether each fluid is in the pore-throat of the capillary (S11); determining the injection volume of carbon dioxide or water in the current interval according to whether each fluid is in the pore-throat of the capillary, the geometry of the capillary, the pressure difference between the two ends of the capillary, and preset parameter values (S12); determining the ratio of the injection volume to the pressure difference between the two ends of the capillary as the injection capacity of the capillary for injecting carbon dioxide or water in the current interval (S13); determining the flow rate of carbon dioxide according to the injection volume, and determining the equivalent length of the miscible zone at the start time of the next interval according to the flow rate of carbon dioxide, the total injection duration until the end of the current interval, and a pre-established relationship between the equivalent length of the carbon dioxide-crude oil miscible zone and the flow time and flow rate of carbon dioxide (S14); and determining the equivalent length of carbon dioxide at the start time of the next interval according to the equivalent length of the miscible zone at the start time of the next interval (S15), so that the injection capacity during alternative injection of water and gas can be quantified on a microscopic scale, and a theoretical basis is provided for the study of the variation law and influencing factors of oil reservoir injection capacity.

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Inventors:
WANG WENDONG (CN)
MENG FANKUN (CN)
SU YULIANG (CN)
WANG CHENGWEI (CN)
HAO YONGMAO (CN)
LI XINYU (CN)
CHEN ZIQIANG (CN)
Application Number:
PCT/CN2019/114055
Publication Date:
February 11, 2021
Filing Date:
October 29, 2019
Export Citation:
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Assignee:
CHINA UNIV OF PETROLEUM EAST (CN)
International Classes:
E21B43/16; G06Q50/06
Foreign References:
CN110415141A2019-11-05
CN105021506A2015-11-04
CN103114830A2013-05-22
CN101446189A2009-06-03
Other References:
MENG, FANKUN: "Injectivity analysis for water-alternating-CO2 flooding in ultra-low permeability oil reservoirs", IFEDC-20182333, 15 June 2018 (2018-06-15), pages 2384 - 2391, XP055778394, ISSN: 1674-0246
Attorney, Agent or Firm:
SAGACIOUS IP CO., LTD. (CN)
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