Abstract
In order to study the difference of pore structure characteristics between the second oil reservoir and the main oil reservoir in Daqing oilfield, the pore structure characteristic parameters of core were characterized by routine mercury injection experiment. The results show that the average pore radius of the main reservoir ranges from 5.24μm to 12.50μm, the sorting coefficient ranges from 1.14 to 3.08, the median saturation pressure ranges from 0.04MPa to 0.27MPa, and the maximum median radius can reach 15μm. The permeability is high and the displacement pressure is low. The average pore radius of the second type reservoir is in 2.21μm~9.03μm, the sorting coefficient is 2.70~4.77, the median saturation pressure is 0.076MPa~5.148MPa, the maximum radius is only 5μm, and the permeability is low and the displacement pressure is high. It is important to clarify the difference of reservoir pore structure characteristics for efficient reservoir development.
Highlights
Pore structure of reservoir rock is characterized by influencing reservoir fluid reservoir capacity and oil and gas resources are the main factors, especially the multiphase fluid in the reservoir seepage features, in addition to its place of temperature and pressure conditions and the interaction between rock and fluid, more important is related to the microscopic pore structure characteristics of the reservoir
A total of 398 rock samples from 19 Wells in the second and main oil reservoirs of daqing placanticline were selected for routine mercury injection experiments, of which 231 are the main oil reservoirs and 127 are the second oil reservoirs
It can be seen that the capillary pressure curve of the main oil reservoir is close to the lower left, and there is a gentle section, indicating that the main oil reservoir has high permeability, large pore radius, a large proportion of large pores, good pore throat sorting, and low capillary pressure[5]
Summary
Pore structure of reservoir rock is characterized by influencing reservoir fluid reservoir capacity and oil and gas resources are the main factors, especially the multiphase fluid in the reservoir seepage features, in addition to its place of temperature and pressure conditions and the interaction between rock and fluid (wetting, adsorption, etc.), more important is related to the microscopic pore structure characteristics of the reservoir. The reservoir pore radius, the radius of the median, sorting coefficient and permeability, expulsion pressure 2 kinds of microscopic pore structure characteristics of the reservoir rock and its distribution, is to increase the crude oil recovery factor and the key to reservoir development effect, to the sustainable development of oil field implementation, eventually improve the economic benefits of oilfield has very important practical significance[1,2,3]
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