Title:
NITROGEN COMPOSITE HUFF-PUFF METHOD FOR CLOSED FAULT BLOCK OIL RESERVOIR
Document Type and Number:
WIPO Patent Application WO/2019/223346
Kind Code:
A1
Abstract:
An nitrogen composite huff-puff method for a closed fault block oil reservoir, comprising: selecting an oil reservoir to be developed: coarsely screening the oil reservoir to which a development method is applicable according to the following conditions: the oil reservoir being a closed fault block oil reservoir, the burial depth < 5000 m, the remaining oil saturation > 0.5, the reservoir thickness > 10 m, the horizontal permeability > 100 mD, the ratio of the vertical permeability and the horizontal permeability > 0.35, the reservoir porosity > 0.20, the dip angle > 8°; and sequentially performing operations of the following huff-puff stages: a nitrogen huff-puff stage, a nitrogen and water composite huff-puff stage, a nitrogen and foaming agent composite huff-puff stage, and a nitrogen and carbon dioxide composite huff-puff stage. According to the method, from the perspective of improving the later-period effect of nitrogen huff-puff, slugs such as water, a foaming agent solution, and carbon dioxide are added to the nitrogen huff-puff, so that the sealing and yield increasing effect of the nitrogen huff-puff is effectively improved, and high-efficient and stable development of the closed fault block oil reservoir in the later-period of the nitrogen huff-puff is achieved.
Inventors:
LU TENG (CN)
LI ZHAOMIN (CN)
LI JIAN (CN)
ZHANG DINGYONG (CN)
HOU DAWEI (CN)
LI ZHAOMIN (CN)
LI JIAN (CN)
ZHANG DINGYONG (CN)
HOU DAWEI (CN)
Application Number:
PCT/CN2019/071824
Publication Date:
November 28, 2019
Filing Date:
January 15, 2019
Export Citation:
Assignee:
UNIV CHINA PETROLEUM (CN)
International Classes:
E21B43/16
Foreign References:
| CN108708693A | 2018-10-26 | |||
| CN105089584A | 2015-11-25 | |||
| CN2871830Y | 2007-02-21 | |||
| CN104033137A | 2014-09-10 | |||
| US20070204995A1 | 2007-09-06 |
Other References:
WANG GUO-MIN ET AL, SPECIAL OIL & GAS RESERVOIR, vol. 11, no. 3, 30 June 2004 (2004-06-30), pages 46-48 - 67, XP055657305, ISSN: 1006-6535
Attorney, Agent or Firm:
ZHUSEN INTELLECTUAL PROPERTY AGENCY OFFICE (CN)
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