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Developing Situation and Trend Analysis of Combined Well Pattern of Horizontal Well in Low Permeability Reservoir: Case in Yushulin Horizontal Wells in the Development Block
Author(s) -
ZHANG Meiling,
LI Chuanjiang,
YOU Jiayu
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12305_12
Subject(s) - horizontal and vertical , geology , block (permutation group theory) , development (topology) , petroleum engineering , permeability (electromagnetism) , mathematics , geometry , geodesy , chemistry , mathematical analysis , biochemistry , membrane
Now, the key of oil-field’s increase production is the development technology for extra-low permeability reservoirs whose porosity is less than 5% and permeability less than 5 mD. The technologies of horizontal well, fracturing and gas driving are the advanced means of improving recovery. The complexity of forming conditions, microscopic holes roar conditions, percolation mechanism of extra-low permeability sandstone reservoirs cause serious difficulties in the use of these technologies for development. YI7 reservoir of Yushulin oil-field is a kind of typical extra-low permeability reservoir, whose average porosity is 11.5%, air permeability is 2.21 × 10 μm(Shi Jingping, 2003). Since 1993, the reservoir has been in the development of vertical wells for 14 years, combined well pattern of horizontal-vertical well of water driving experiment for 4 years and another 4 years of combined well pattern of horizontal-vertical well of carbon dioxide driving experiment (Li Chuanjiang,2009). It is basically in the forefront of the history of extra-low permeability reservoir development in China. Based on YI7 reservoir of Dong14 area, summary and analysis of relevant literature, this paper has analysed all stages of development issues and correlative controlling factors to explore the appropriate solutions of the combined well pattern of horizontal-vertical well.