Method for measuring initial oil saturation

A saturation and original technology, applied in measuring devices, earthwork drilling and mining, instruments, etc., to achieve the effects of easy wide-scale promotion and use, simple calculation, and fast operability

Active Publication Date: 2015-08-19
PETROCHINA CO LTD
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Problems solved by technology

This method is easy to collect data and the calculation process is simple, but it is often not completely reliable because it is an indirect calculation of oil saturation, especially in tight oil and gas with complex rock properties, and requires accurate original oil saturation data for calibration. Promote application

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  • Method for measuring initial oil saturation
  • Method for measuring initial oil saturation

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Embodiment Construction

[0025] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0026] The technical solution of the present invention will be described in detail below with a specific embodiment.

[0027] This embodiment provides a method for measuring the original oil saturation of tight oil. A core sample from Well X, a tight oil layer in Fuyu oil layer of Jilin Oilfield, is selected for experimentation. The underground temperature and pressure conditions of the core sample are 90°C and 20Mpa. The method includes the following steps: step:

[0028] (1) The oil saturation of the core sample is measured by the extraction method specified in the China Petroleum and Natural Gas Industry Standard SY / T5336-2006, denoted as S o , the condition of oil sat...

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Abstract

The invention provides a method for measuring the initial oil saturation. The method comprises the following steps that formation fluid pressure corresponding to the actual depth is exerted on a core sample, and crude oil is injected in the core sample; after weighing is completed, through a formula and extraction oil saturation, the initial oil saturation is calculated after crude oil evaporation correction is completed; the crude oil sample density under the condition of a normal temperature and the crude oil sample density under the condition of a ground temperature are measured, the initial oil saturation after density coefficient correction is calculated through a formula, and namely the initial oil saturation is measured. The method is particularly suitable for measuring the initial oil saturation of oil-water layer type tight oil with low oil saturation, and has the advantages of being accurate, quick and easy to popularize and the like.

Description

technical field [0001] The invention relates to a method for measuring original oil saturation, which belongs to the technical field of oil saturation measurement in the field of oil exploitation and geological exploration. Background technique [0002] The original oil saturation refers to the oil saturation inside the rock under the reservoir conditions. The experimental technology of oil saturation measurement is an important research content of the experimental research on oil and gas accumulation. Accurate determination of original oil saturation is the key to tight oil reserve calculation. Although China's petroleum and natural gas industry standard SY / T5336-2006 has clearly stated that the most reliable original oil saturation measurement technology is the pressure-holding sealed coring method. However, due to the high price, high technical cost and difficulty of pressure-holding and sealed coring technology, the promotion and use of pressure-holding and sealed cori...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCG01N5/00
Inventor 公言杰邹才能柳少波姜林任义丽
Owner PETROCHINA CO LTD
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