CN111487234B - Method for judging whether reservoir contains water or not by utilizing three-dimensional quantitative fluorescence spectrogram characteristics - Google Patents
Method for judging whether reservoir contains water or not by utilizing three-dimensional quantitative fluorescence spectrogram characteristics Download PDFInfo
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- CN111487234B CN111487234B CN202010600254.2A CN202010600254A CN111487234B CN 111487234 B CN111487234 B CN 111487234B CN 202010600254 A CN202010600254 A CN 202010600254A CN 111487234 B CN111487234 B CN 111487234B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
Abstract
The invention discloses a method for judging whether a reservoir contains water or not by utilizing three-dimensional quantitative fluorescence spectrogram characteristics, belongs to the technical field of well drilling, and solves the technical problems that the traditional method for judging the fluid properties in the reservoir is complex, needs independent software for calculation and is difficult to operate; the method comprises the following steps: collecting crude oil property data of a plurality of well sections of a well area to be measured to judge the crude oil property to be measured, carrying out three-dimensional quantitative fluorescence analysis on a plurality of samples to be measured to obtain corresponding analysis spectrograms and data, and judging whether water is contained in an oil layer or not according to the change of longitudinal oil peaks in the three-dimensional quantitative fluorescence spectrograms of the samples by combining the judged crude oil property; the method utilizes the characteristic of the change of crude oil properties before and after the reservoir contains water, and assists in judging the water-containing property of the reservoir through the difference of the three-dimensional fluorescence spectrogram in the longitudinal direction.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a method for judging whether a reservoir contains water or not by utilizing three-dimensional quantitative fluorescence spectrogram characteristics.
Background
With the development of the three-dimensional quantitative fluorescence technology, the method has better effects on the aspects of true and false oil gas display identification, crude oil property judgment, oil-gas abundance and the like, and adds a powerful means for field logging work. Research shows that when the water content of the oil field is developed by water injection, the properties of the crude oil are continuously deteriorated, the density, the viscosity, the wax content and the solidifying point of the crude oil are gradually increased, and certain regularity is shown. The reasons for such changes include not only reservoir temperature, pressure, crude oil properties, but also the temperature of the injected water, water quality, and injection mode. The traditional method for judging the reservoir fluid property is complex, needs independent software calculation and is not easy to operate.
Disclosure of Invention
Aiming at the technical problems that the mode for judging the water content of the reservoir is complex and independent calculation software is needed, the invention provides a method for judging whether the reservoir contains water by using the characteristics of the three-dimensional quantitative fluorescence spectrogram, so that the problem of identifying the water content of the reservoir is solved, and the aim of quickly screening whether the oil layer contains water can be fulfilled to assist field logging work.
In order to solve the technical problem, the invention provides a method for judging whether a reservoir contains water by utilizing three-dimensional quantitative fluorescence spectrogram characteristics, which comprises the following steps of:
the method for judging whether the reservoir contains water or not by utilizing the characteristics of the three-dimensional quantitative fluorescence spectrogram is characterized by comprising the following steps of:
s1: collecting crude oil property data of a plurality of well sections of a well area to be tested to judge the crude oil property of the well to be tested;
s2: respectively carrying out three-dimensional quantitative fluorescence analysis on samples to be tested at different depths to obtain corresponding analysis spectrograms and data;
s3: when the crude oil property determined by the emission wavelength of the main peak of the oil peak of the three-dimensional quantitative fluorescence spectrogram of the samples with different depths to be measured is consistent with the crude oil property determined by the crude oil property data of the well region to be measured, the number and the positions of the oil peak in the three-dimensional quantitative fluorescence spectrogram corresponding to the samples with different depths are changed, the positions are changed to ensure that the emission wavelength of the oil peak is in different regions of oil quality, or the strength of the solvent peak is changed, so that the reservoir contains water;
and if the crude oil property determined by the emission wavelength of the main peak of the oil peak of the three-dimensional quantitative fluorescence spectrogram of the samples with different depths to be logged is consistent with the crude oil property determined by the crude oil property data of the well region to be logged, the number and the position of the oil peak in the three-dimensional quantitative fluorescence spectrogram corresponding to the samples with different depths are not changed, and the strength of the displayed solvent peak is not changed, the reservoir contains no water.
For optimization, the samples with different depths in the S2 are sampled with different depths in the well section to be tested.
And optimally, continuously and uniformly sampling samples with different depths from top to bottom or from bottom to top in the well section to be detected.
As an optimization, in order to visually see the longitudinal change of the three-dimensional quantitative fluorescence spectrum, the number of the samples to be measured is at least 3.
As optimization, in order to improve the accuracy of whether the well section to be detected contains water, the total length of the well section to be detected is not more than 20 m.
For optimization, collecting crude oil property data of a plurality of well sections of the well area to be tested in S1, wherein the crude oil property data comprise crude oil density, viscosity and oil testing conclusion; the density of the crude oil is used for judging the crude oil quality of the well section to be detected, the viscosity is used for assisting in judging the crude oil quality of the well section to be detected, and the oil testing conclusion is that whether oil gas flows in the well section to be detected or not is judged.
Compared with the prior art, the invention has the following technical effects:
the method utilizes the three-dimensional quantitative fluorescence technology to judge the water content of the reservoir and utilizes the characteristics of the crude oil property change before and after the water content of the reservoir, and assists in judging the water content of the reservoir by the difference of the three-dimensional quantitative fluorescence spectrogram in the longitudinal direction, thereby achieving the purpose of quickly judging whether the oil layer contains water.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a three-dimensional quantitative fluorescence spectrum of example 1 of the present invention;
FIG. 2 is a three-dimensional quantitative fluorescence spectrum of example 2 of the present invention;
FIG. 3 is a three-dimensional quantitative fluorescence spectrum of example 3 of the present invention;
FIG. 4 is a three-dimensional quantitative fluorescence spectrum of example 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention determines whether the reservoir contains water by sampling the well sections 2397.5-2401.5m (embodiment 1), 2403-2408 (embodiment 2), 2411.4-2413.0m (embodiment 3) and 4308-4310m (embodiment 4) and performing three-dimensional quantitative fluorescence analysis.
Example 1
Collecting crude oil property data of a plurality of well sections of a well region to be detected comprises the following steps: the density, viscosity and oil testing conclusion of the crude oil determine the properties of the crude oil of the well to be tested, and the properties are shown in table 1:
TABLE 1 crude oil Property data for multiple well sections of a well area to be tested
And (3) combining the above steps, the oil testing conclusion is mainly an oil layer and an oil-containing water layer, and the crude oil analysis is as follows: the density of the crude oil ranges from 0.84 to 0.88g/cm3The viscosity is 5-30 mPa.S, and the crude oil density is used for judging the crude oil quality of the area to be loggedSymbolized as middle quality oil (see Table 2)
TABLE 2 relationship of crude oil density to crude oil quality
As shown in figure 1, 3 rock debris samples, namely 2397.5m (figure 1-1), 2399.3m (figure 1-2) and 2401.5m (figure 1-3), are continuously and uniformly taken from top to bottom from a well section to be detected 2397.5-2401.5m, are soaked by n-hexane and then subjected to three-dimensional quantitative fluorescence analysis, a three-dimensional quantitative fluorescence spectrogram is obtained and analyzed, and the excitation wavelength and the emission wavelength of an oil peak can be directly obtained in the three-dimensional quantitative fluorescence spectrogram.
The three-dimensional quantitative fluorescence spectrogram shows that the graph 1-1 is a single peak type, the emission wavelength is 345nm on the abscissa of the graph, the excitation wavelength is 300nm on the ordinate, the oil peak is obvious, the shape is regular, and the edge is clear, namely the main peak; fig. 1-2 shows a smaller peak in shape at the upper right of the main peak, i.e. fig. 1-2 shows a transition from monomodal to bimodal; the smaller peak at the upper right of the graph 1-3 is gradually regular, the newly appeared peak is the secondary peak, the secondary peak has the emission wavelength of 425nm and the excitation wavelength of 380nm, and the graph 1-1 to the graph 1-3 gradually transits from single peak to double peak.
And (3) judging whether water is contained: the emission wavelength of the position of the main peak of the oil peak in the three-dimensional quantitative fluorescence spectrogram is 345-380 nm, is positioned in the range of the medium oil peak (see table 3), and is the same as the medium oil characteristic determined by collecting the crude oil data of the well region to be detected; the three-dimensional quantitative fluorescence spectrograms in the figures 1-1 to 1-3 are transited from a single peak type to a double peak type, the number of the peaks is changed from a single peak to a double peak, an oil interval of a secondary peak shown later is a heavy oil range, and the oil interval is different from an interval of a main peak, so that the water content of a reservoir stratum is judged.
TABLE 3 emission wavelength vs. crude oil quality
Example 2
The crude oil property data of a plurality of well sections of the well region to be detected is collected to judge the crude oil characteristics of the well region to be detected in the embodiment 1.
As shown in FIG. 2, 3 rock debris samples, namely 2403m (shown in FIG. 2-1), 2405.9 m (shown in FIG. 2-2) and 2408m (shown in FIG. 2-3), are continuously and uniformly taken from top to bottom from the well section 2403 to be detected 2408m, and are soaked in n-hexane and then subjected to three-dimensional quantitative fluorescence analysis to obtain an analysis three-dimensional quantitative fluorescence spectrogram.
2-1, the emission wavelength of the main peak is 365nm, the excitation wavelength is 310nm, the main peak is located in a medium oil range interval and is the same as the medium oil characteristic determined by collecting crude oil data of the well region to be detected, secondary peaks are a plurality of peaks tangent to the boundary of the three-dimensional fluorescence region displayed in the three-dimensional fluorescence spectrogram, the boundary is located on a diagonal line of a plane where an xy axis is located, the secondary peaks are peaks displayed by n-hexane used for soaking a sample, namely solvent peaks, the emission wavelengths of the solvent peaks are all larger than 380nm, and the solvent peaks are located in a heavy oil interval; 2-2 show that the main peak position is unchanged, the intensity of the solvent peak is gradually reduced until the solvent peak disappears in the images 2-3, and the water content of the reservoir can be judged from the change of the multi-peak to the single-peak.
Example 3
The crude oil property data of a plurality of well sections of the well region to be detected is collected to judge the crude oil characteristics of the well region to be detected in the embodiment 1.
As shown in FIG. 3, 6 rock debris samples are continuously and uniformly taken from top to bottom from a well section to be detected 2411.4-2413.0, wherein the rock debris samples are 2411.4m (shown in FIG. 3-1), 2411.7 m (shown in FIG. 3-2), 2412 m (shown in FIG. 3-3), 2412.3 m (shown in FIG. 3-4), 2412.6 m (shown in FIG. 3-5) and 2413 m (shown in FIG. 3-6), and are subjected to three-dimensional quantitative fluorescence analysis after being soaked in n-hexane, so as to obtain an analysis three-dimensional quantitative fluorescence spectrum.
The three-dimensional quantitative fluorescence spectrograms of the 6 samples are all single peaks, the emission wavelength of the positions of the peaks is 365nm, the emission wavelength is located in the range of the medium oil peak, the characteristics of the medium oil are the same as those of the medium oil judged by collecting crude oil data of the well region to be detected, no other peaks appear, the number and the positions of the peaks are not changed, and the strength and the weakness of the solvent peak are not changed, so that the reservoir stratum is judged to be an oil layer without water.
Example 4
The density of the crude oil collected in the well region to be analyzed is 0.90g/cm3And a viscosity of 30 mPa.And S and testing the oil to obtain an oil-water-containing layer, and judging the property of the crude oil of the well to be tested to be heavy oil.
As shown in FIG. 4, 3 well sections 4308-4310m to be detected are continuously sampled from top to bottom, which are 4308m (FIG. 4-1), 4309m (FIG. 4-2) and 4310m (FIG. 4-3), and are soaked in n-hexane and then subjected to three-dimensional quantitative fluorescence analysis to obtain an analysis three-dimensional quantitative fluorescence spectrum.
FIG. 4-1 shows that the oil peak is tangent to the boundary of the three-dimensional quantitative fluorescence spectrum as a distinct solvent peak; FIG. 4-2 shows that the solvent peak is significantly reduced, nearly vanishing; fig. 4-3 show the solvent peak emerging from the new. The emission wavelength of the 3 samples is within the interval of 400-425nm, is positioned in the range interval of the heavy oil, has the same characteristics with the heavy oil determined by collecting crude oil data of the well region to be detected, and determines the water content of the reservoir layer when the solvent peak changes from strong to weak and has the change of the strength of the solvent peak.
Claims (4)
1. The method for judging whether the reservoir contains water or not by utilizing the characteristics of the three-dimensional quantitative fluorescence spectrogram is characterized by comprising the following steps of:
s1: collecting crude oil property data of a plurality of well sections of a well area to be tested to judge the crude oil property of the well to be tested;
s2: respectively carrying out three-dimensional quantitative fluorescence analysis on samples to be tested at different depths to obtain corresponding analysis spectrograms and data;
s3: when the crude oil property determined by the emission wavelength of the main peak of the oil peak of the three-dimensional quantitative fluorescence spectrogram of the samples with different depths to be measured is consistent with the crude oil property determined by the crude oil property data of the well region to be measured, the number and the positions of the oil peak in the three-dimensional quantitative fluorescence spectrogram corresponding to the samples with different depths are changed, the positions are changed to ensure that the emission wavelength of the oil peak is in different regions of oil quality, or the strength of the solvent peak is changed, so that the reservoir contains water;
and if the crude oil property determined by the emission wavelength of the main peak of the oil peak of the three-dimensional quantitative fluorescence spectrogram of the samples with different depths to be logged is consistent with the crude oil property determined by the crude oil property data of the well region to be logged, the number and the position of the oil peak in the three-dimensional quantitative fluorescence spectrogram corresponding to the samples with different depths are not changed, and the strength of the displayed solvent peak is not changed, the reservoir contains no water.
2. The method of claim 1, wherein the samples at different depths in S2 are samples at different depths in the wellbore section to be tested.
3. The method of claim 2, wherein samples of different depths are sampled continuously and uniformly from top to bottom or from bottom to top in the interval to be tested.
4. The method of claim 1, wherein the collecting of crude oil property data of a plurality of intervals in the region to be logged in S1 comprises crude oil density, viscosity and oil testing conclusion.
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| US9494023B2 (en) * | 2012-04-15 | 2016-11-15 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Nano-sensors for oil and gas reservoir characterization |
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| CN107796794B (en) * | 2017-09-28 | 2020-11-17 | 中国石油天然气集团有限公司 | Online oily sewage detection method based on ultraviolet fluorescence method |
| CN108801986B (en) * | 2018-03-05 | 2020-09-15 | 中海石油（中国）有限公司天津分公司 | Method for judging oil quality and fluid type by using three-dimensional quantitative fluorescence map derived parameters |
| CN111007230B (en) * | 2019-11-21 | 2022-03-29 | 中国石油天然气股份有限公司 | Method for quantitatively evaluating oil content of low-porosity compact oil reservoir of continental-phase lake basin |
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| CN104076019A (en) * | 2014-07-22 | 2014-10-01 | 中国海洋石油总公司 | Method by adopting three-dimensional quantificational fluorescence measurement parameter to judge oil type |
| CN104076020A (en) * | 2014-07-22 | 2014-10-01 | 中国海洋石油总公司 | Method for recognizing reservoir fluid property by adopting three-dimensional quantitative fluorescent longitudinal parametric variation trend |
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