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A method for evaluating particle size distribution of polymer microspheres and its reservoir adaptability

A technology for reservoir adaptability and particle size of microspheres, which is applied in particle size analysis, particle and settlement analysis, permeability/surface area analysis, etc. The effect of recovery factor

Inactive Publication Date: 2019-09-24
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] The present invention is to overcome the problem that the existing experimental research methods existing in the background technology are difficult to accurately reflect the particle size distribution of polymer microspheres and the adaptability of microsphere particle size and pores, and provide a particle size distribution of polymer microspheres and its oil The evaluation method of reservoir adaptability can provide important technical support for polymer microsphere deep control and flooding technology, and it is an evaluation method with simple process and obvious technical and economic effects

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  • A method for evaluating particle size distribution of polymer microspheres and its reservoir adaptability
  • A method for evaluating particle size distribution of polymer microspheres and its reservoir adaptability
  • A method for evaluating particle size distribution of polymer microspheres and its reservoir adaptability

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Embodiment Construction

[0024] With reference to each figure, the implementation scheme is as follows:

[0025] 1. Experimental conditions:

[0026] 1. Polymer microspheres including SMG (W) and SMG (Y) Two kinds, with 100% effective content, provided by Oil Production Institute of China Petroleum Exploration and Development Research Institute. The water used in the experiment was sewage injected from the No. 1 Oil Production Plant of Daqing Oilfield. The water quality analysis is shown in Table 1.

[0027] Water quality analysis list 1

[0028]

[0029] 2. The experimental core is an artificial homogeneous columnar core cemented with quartz sand and epoxy resin, with a geometric size of Ø2.5´10cm. SMG （W） Core K for microsphere experiments g =170×10 -3 μm 2 , 185×10 -3 μm 2 , 218×10 -3 μm 2 , 237×10 -3 μm 2 , 302×10 -3 μm 2 and 489×10 -3 μm 2 ,SMG （Y） Core K for microsphere experiments g =585×10 -3 μm 2 , 600×10 -3 μm 2 , 701×10 -3 μm 2 , 712×10 -3 μm 2 , 903×10 -3 μm...

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Abstract

The invention belongs to the technical field of oil reservoir development, and in particular relates to an evaluation method for the particle size distribution of polymer microspheres and its oil reservoir adaptability. 1. Statistical method of particle size distribution of polymer microspheres: (1) count the number and particle size of microspheres in this area, and give the maximum particle size and minimum particle size; (2) divide the data into several groups, and calculate the group distance (3) Calculate the boundary position of each group; (4) Count the occurrence frequency of each group of data, and calculate the frequency of each group; (5) Make a microsphere particle size distribution curve; 2. The polymer microsphere reservoir adaptability evaluation method : The adaptability of polymer microspheres to reservoirs is evaluated by the matching relationship between microspheres and pores. Cores with different permeability are selected to test the resistance coefficient and residual resistance coefficient of microspheres passing through the core. If the microspheres can enter the core pores and transport and migrate , and the injection pressure presents an "increase-stable" state, then their geometric dimensions match each other, and the core permeability at this time is called the limit value of microsphere permeability.

Description

Technical field: [0001] The invention belongs to the technical field of oil reservoir development, and in particular relates to an evaluation method for the particle size distribution of polymer microspheres and its oil reservoir adaptability. Background technique: [0002] Polymer flooding technology has become an important technical means of oil development because of its relatively simple technology, small equipment investment and large recovery rate increase. However, in the middle and late stages of polymer flooding, the phenomenon of "absorption profile inversion" caused by reservoir heterogeneity and polymer retention characteristics has seriously affected the development effect of polymer flooding. Polymer microspheres have the characteristics of strong deformation ability and narrow distribution range of microsphere particles. After entering the porous medium, they have the plugging characteristics of "blocking large but not small" and "capture-deformation-migration...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01N15/08
Inventor 孙哲卢祥国刘义刚张云宝夏欢周彦霞金玉宝
Owner NORTHEAST GASOLINEEUM UNIV
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