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The Microscopic Flowing Characters Of Oil By Water In Low-permeability Oil Field Study

Posted on:2010-11-24Degree:MasterType:Thesis
Country:ChinaCandidate:J H ShaoFull Text:PDF
GTID:2120360272993995Subject:Mineralogy, petrology, ore deposits
Abstract/Summary:PDF Full Text Request
With the oil field of rich and fat become lack,so the future reserves more and more relay the poor reserves. So researching and understanding of the micro-pore structure of low-permeability reservoir rock and its characters of micro-water seepage flooding is an very important significance. In this paper, we take the low-permeability B oil fields as an example, its pore structure of reservoir rock and heterogeneity of a comprehensive system of research, at the same time the use of real sandstone micro-model of the fluid flow characteristics, the form of residual oil, distribution and affection of the water flow in a large number of the main factors of the indoor experimental research, the main access to the following understanding:(1) The overall physical properties of B oil reservoir Chang 6 is poor. B1 area average porosity of 13.3%, permeability rate of 0.62×10-3μm2.B2 area average porosity was 14.8% penetration rate of 1.24×10-3μm2.(2) The pore throat of Chang 6 B oil reservoir is smaller, B1 area throat in the value of the average radius of 0.13μm, an average pore size of 30μm B2 area throat radius of the average value of 0.22μm, an average pore size of 44μm; Well although the two have small pore porosity mainly to small pore throat combination of type-based micro-jets.(3) Experiments show that the water flooding, there are two form of water in the flooding, because of B2 area's physical properties is better, water flooding mainly uniform displacement-based approach, and ultimately higher oil displacement efficiency. And because of B1 area, physical properties is poor, water flooding mainly refers to the displacement mode shape-based, lower oil displacement efficiency.(4) Water flooding experiment showed that the residual oil .There are two main forms: the major film exists in the pore water flooding over the pore wall and corner positions. Flow around the formation of residual oil are the main two forms: small-scale flow, water is the oil to bypass the smaller the pore throat, large-scale flow, water only after a large pore throat to bypass the larger, in which flow is the main form of residual oil.(5) The experimental results show that the ultimate impact of oil displacement efficiency of the following factors: reservoir properties, displacement pressure, reservoir heterogeneity, as well as the wettability of reservoir. That the material is the primary factor.In this paper, the results of research a larger form of the distribution of theoretical significance to obtain the understanding of low-permeability reservoir of water percolation mechanism and the remaining oil. And also has a greater practical significance.the development of low-permeability oil field water injection...
Keywords/Search Tags:low-permeability reservoir, pore structure heterogeneity, Microscopic percolation character
PDF Full Text Request
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