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Fracturing Parameter Optimization of Horizontal Well in Tight Oil Reservoirs
Author(s) -
MIN Chunjia,
LU Shuangfang,
TANG Mingming,
CHEN Fangwen,
LIANG Hongru
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_7
Subject(s) - tight gas , petroleum engineering , tight oil , geology , hydraulic fracturing , computer science , paleontology , oil shale
Horizontal wells have the advantage of large drainage area and high single well production, which plays an important role in improving production of the low permeability oil reservoirs and ultimate recovery. When the reservoirs have the quality of lower permeability, large flow resistance, poor connectivity, we appropriately use horizontal well fracturing technology, which can further improve the production of horizontal wells and ultimate recovery as well as improve the economic benefits of exploitation. The hydro-fracturing technology of horizontal wells, an important way in exploiting the low permeability reservoirs, has been widely used in recent years. Currently, there are an amount of researches about fracturing horizontal well productivity and its influence factors studied by domestic and international scholars. However, because of the complex relationships between fracture parameters and the fracturing of horizontal well parameters, especially when the non-darcy flow characteristics and heterogeneity exist, the effect of various parameters are more complex. The type of the study reservoir is the typical tight oil reservoir. The reservoir is mainly deposited river sedimentary facies by thin interbedded, thin sand body in vertical, and it is extremely difficult in exploration and development. Low porosity and permeability and low productivity have been the main factors for increasing productivity and the thickness of reservoir, mainly because of the widely changed thickness of the sand body, complex spatial distribution and tight sandstone reservoirs. The average porosity is 11.13% and the average formation permeability is 0.35×10μm; Serious heterogeneity and development of micro cracks are the typical of tight sandstone reservoirs. After decades of development, horizontal wells and hydro-fracturing fracturing technology have been widely applied and achieveing good results in the development of these field. The research on the rules of single well productivity of tight oil reservoir and its influenced factors are of great significance to the development of tight oil and the overall deployment. When the horizontal well is fractured, it generally forms multiple cracks. Due to the differences of geostress in the direction of the horizontal well’s length and the limitation of fracturing technology, the formed cracks are different in length and perveance. The length of crack, the fracture gap and perveance and other main fracturing parameters will have certain influence on the productivity; therefore, fracturing parameters’ optimization is very important to the productivity of tight oil reservoir and ultimate recovery.