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Method for measuring occurrence thickness of oil film in tight reservoir micro-nano pore throat

A technology of micro-nano pores and tight reservoirs, which is used in the measurement of the thickness of oil film in the micro-nano pore throats of tight reservoirs, and in the field of experimental calculation. Effect

Active Publication Date: 2014-04-30
PETROCHINA CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the thickness of the oil film in the micro-nano pore throats of tight reservoirs, so as to solve the problem that the technology does not measure the thickness of the movable oil film in the micro-nano pore throats of tight reservoirs. question

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  • Method for measuring occurrence thickness of oil film in tight reservoir micro-nano pore throat
  • Method for measuring occurrence thickness of oil film in tight reservoir micro-nano pore throat
  • Method for measuring occurrence thickness of oil film in tight reservoir micro-nano pore throat

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[0038] Taking the No. 3 point of the 2121m sample in well R59 as an example, the main elements are C, O, and S i , the mass percentages are 71.22%, 22.55% and 5.2%, and the atomic number percentages are 78.41%, 18.64% and 2.45%, respectively, indicating that the main mineral within the detection range is quartz (S i o 2 ), S i o 2 The atomic percentage of O in S is i 2 times the atomic percentage, which is 4.9%, so S i o 2 The ratio of O atoms in the total O atoms is 0.26, then S i o 2 The atomic mass percentage of O in the oil film is 5.93%, so it can be calculated that the atomic mass percentage of O in the oil film is 16.62%. Then S i o 2 The mass percentage is 5.93%+5.2%=11.13%, the hydrocarbon mass percentage is 71.22%+16.62%=87.84%, and the corresponding hydrocarbon molecular expression can be written as C 71 o 14 h n x m , where n represents the proportion of H elements, X represents the other elements in hydrocarbon molecules other than C, O, and H, and m ...

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Abstract

The embodiment of the invention provides a method for measuring the occurrence thickness of an oil film in a tight reservoir micro-nano pore throat. The method includes the steps of selecting a core sample; carrying out element content measuring on the movable oil film of the core sample through an energy disperse spectroscopy to obtain a mass percent and an atomicity mass percent of elements; according to the mass percent and the atomicity mass percent of the elements in the core sample, calculating a detection range V of the energy disperse spectroscopy and a percentage C of the size of the movable oil film in a total detection range of the energy disperse spectroscopy; measuring the size of a pore of oil film occurrence by means of a field emission-environment scanning electron microscope, wherein the length is x, the width is y, the height is z, and calculating the coverage surface area S of the oil film according to a formula defined as S=phi(z2+(MAX(x,y) / 2)2); calculating the occurrence thickness of the oil film by means of the formula defined as H=CV / S. By means of a high-power observation and energy spectrum quantitative determination method, the problem that resolution of a conventional method can not meet the requirement of observation and calculation of the crude oil thickness in the micro-nano pore throat, and solves the difficult problem that oil in the core sample is volatile and can not be observed easily, and results are genuine and believable.

Description

technical field [0001] The invention relates to the field of increasing oil and gas storage and production, in particular to a test calculation method, specifically a method for measuring the thickness of oil film in micro-nano pore throats of tight reservoirs. Background technique [0002] Tight oil is the current research hotspot, and it is also an important part of increasing reserves and production of oil and gas resources. At present, scholars at home and abroad have carried out a large number of effective exploratory studies on the characterization of tight oil micro-nano pore-throat system, and put forward many prospective research results. At present, it is generally believed that micro-nano pore-throats are the main storage space of tight oil reservoirs. Therefore, effective calculation of oil film thickness in micro-nano pore throats is of great significance for the evaluation of tight oil resources. [0003] However, there is no research on the calculation method...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/02
Inventor 邹才能公言杰柳少波朱如凯刘可禹姜林袁选俊
Owner PETROCHINA CO LTD
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