A Macroscopic Quantification Method for Residual Oil in Different Microcosmic Occurrence States

A technology of occurrence state and remaining oil, which can be used in earth-moving drilling, wellbore/well components, etc., and can solve problems such as the inability to characterize the absolute amount of remaining oil.

CN103206208BActive Publication Date: 2016-01-20GASOLINEEUM EXPLORATION DEELOPMENT INST OF HENAN OILFIELD BRANCH SINOPEC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-01-20

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Abstract

The invention discloses a method for macroscopically quantizing microscopic remaining oil in different occurrence states. The method includes the steps: acquiring a remaining oil reserve distribution field and a water saturation distribution field by macroscopic numerical simulation; determining the range of underground water saturation under the condition of different washing degrees according to washing degree differentiating standards and original water saturation, and obtaining macroscopic remaining oil reserve with different washing degrees according to the remaining oil reserve distribution field and the water saturation distribution field; determining the washing degree of a rock core in a current state by water saturation correction test for a coring well, determining the relative content of the microscopic remaining oil in different occurrence states by microscopic observation test for oily slices of the coring well, and counting to obtain the relative content of the microscopic remaining oil in different occurrence states under different washing degrees; and macroscopically quantizing the microscopic remaining oil by applying computation expression for microscopic remaining oil mass in different occurrence states according to the macroscopic remaining oil reserve with different washing degrees and the relative content of the microscopic remaining oil in different occurrence states under different washing degrees.
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Description

Technical field

[0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for macroscopic quantification of remaining oil in different microscopic states. Background technique

[0002] Since the 1980s, the study of remaining oil distribution has attracted widespread attention from oil producing countries in the world. The amount of remaining oil and its occurrence state are the basic conditions for further enhancing oil recovery. The current remaining oil research is mainly divided into two aspects: one is the macroscopic remaining oil that reflects the distribution of remaining oil between wells and layers; the other is the microscopic remaining oil that reflects the distribution of remaining oil in the rock pore structure. The macroscopic remaining oil can be quantified using numerical simulation technology, and the microscopic remaining oil can be obtained by analyzing the oil-bearing slices of core wells, but the anal...

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Embodiment Construction

[0044] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not used to limit the present invention.

[0045] figure 1 It shows the implementation process of the method for macro-quantification of remaining oil in different microscopic states provided by the embodiment of the present invention.

[0046] The method includes the following steps:

[0047] Step 1: Obtain the distribution field of remaining oil reserves and water saturation through macroscopic numerical simulation;

[0048] Step 2: Determine the range of underground water saturation under different water washing conditions according to the water washing degree classification standard and the original water saturation, and combin...