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Experimental Research on Flooding Oil by Water Imbibition in Tight Sandstone Oil Reservoir
Author(s) -
TANG Yun,
KANG Yili,
LIU Xuefen,
YOU Lijun
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 - 10.1111/1755-6724.12307_3
Subject(s) - imbibition , water flooding , petroleum engineering , tight oil , geology , flooding (psychology) , water cut , petrology , geotechnical engineering , oil shale , psychology , paleontology , botany , germination , psychotherapist , biology
In recent years, tight oil reservoir has become one of the hot areas of oil and gas exploration and development. Exploration practice shows the technically mineable resources of tight oil in China is (20~25)×10t, which has broad prospects for exploitation. However, the natural productivity of single well in tight sandstone oil reservoirs is low even none. which needs to combine horizontal well drilling, fracturing and other techniques to exploit these reservoirs effectively. Flooding oil by water imbibitions is one of the most important enhanced oil recovery mechanisms in water-wet fractured reservoir. Cracks can significantly improve the absorption capacity of reservoir to provide hypertonic channel between injection and recovery wells, which is widespread in tight sandstone oil reservoirs. Water imbibition is the process that wetting phase go along the capillary pores within the rock, resulting in that the water is sucked into the interior of the rock, and the non-wetting phase fluid is discharged, which is under adhesion tension. Water imbibition can speed up the production of oil and gas by promoting mass energy transfer between fractures and matrix blocks in fractured reservoirs. The factors that have deep influence on the imbibition rate include permeability, shape of base block, boundary condition, fluid viscosity, interfacial tension and wettability etc. The flow of water from fractures to blocks in water-wet reservoirs is in favor of oil exploitation. On the contrary, water flows from blocks to fractures in the oil-wet reservoirs is not conducive to oil exploitation.