CN110984975A - Method and equipment for judging reservoir fluid connectivity and readable storage medium - Google Patents
Method and equipment for judging reservoir fluid connectivity and readable storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000012530 fluid Substances 0.000 title claims abstract description 34
- 238000003860 storage Methods 0.000 title claims abstract description 8
- 238000010586 diagram Methods 0.000 claims abstract description 47
- 150000001875 compounds Chemical class 0.000 claims abstract description 24
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 74
- 239000010779 crude oil Substances 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 8
- 238000004817 gas chromatography Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011160 research Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000002790 cross-validation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a method, equipment and a readable storage medium for judging the connectivity of reservoir fluid. The method comprises the following steps: (1) sampling a first reservoir and a second reservoir; (2) performing GC/MS detection on the first oil sample, the second oil sample and the third oil sample respectively; (3) calculating the difference of peak areas of each compound on the first total ion flow diagram and the second total ion flow diagram, and screening out the compounds of which the absolute values of the differences are greater than a first preset value; (4) calculating a lower limit value S of the similarity0(ii) a (5) According to the similarity S and the lower limit value S of the similarity0The fluid connectivity of the first reservoir and the second reservoir is determined. The invention has the beneficial effects that: and calculating the lower limit value of the similarity according to the peak area of the characteristic compound combination, calculating the similarity of the crude oil gas chromatography fingerprint of the other oil reservoir and the characteristic compound combination of the crude oil gas chromatography fingerprint of the oil reservoir, quantitatively judging the connectivity of the two oil reservoirs, and guiding oil and gas exploitation at the initial stage of oil field development.
Description
Technical Field
The invention relates to the technical field of oil and gas development, in particular to a method and equipment for judging reservoir fluid connectivity and a readable storage medium.
Background
At present, the technology of the petroleum industry leaps forward, the economic benefit is greatly improved, and the importance of petroleum as a national important strategic resource is self-evident. Reservoir connectivity research is very important for the design of oil field early development schemes and the optimization management in the development process. Since the 80 s of the 20 th century, the geochemical chromatography fingerprint method has been widely applied as a new method for calculating the capacity allocation of a commingled production well and judging the fluid connectivity of an oil reservoir. However, at present, the connectivity of the oil reservoir fluid can only be qualitatively judged, and a quantitative judgment standard is lacked, so that the production and development of the oil field are difficult to be effectively guided.
Disclosure of Invention
In view of the above, there is a need for a method for quantitatively determining the fluid connectivity of a reservoir by geochemical chromatography fingerprinting.
The invention provides a method for judging the connectivity of reservoir fluid, which comprises the following steps:
(1) acquiring a first oil sample and a second oil sample obtained after sampling a first oil reservoir, and acquiring a third oil sample obtained after sampling a second oil reservoir, wherein the first oil sample and the third oil sample belong to different layers or different well positions;
(2) performing GC/MS detection on the first oil sample, the second oil sample and the third oil sample respectively to obtain a first total ion flow diagram of the first oil sample, a second total ion flow diagram of the second oil sample and a third total ion flow diagram of the third oil sample;
(3) calculating peak areas of the compounds on the first total ion flow diagram and the second total ion flow diagram according to the obtained first total ion flow diagram and the second total ion flow diagram, and screening out the compounds of which the absolute values of the differences are larger than a first preset value;
(4) calculating the similarity of the peak areas of the screened compounds on the first total ion flow diagram and the second total ion flow diagram to obtain a lower limit value S of the similarity0；
(5) According to the obtained first total ion flow diagram and the third total ion flow diagram, calculating the similarity S of the peak areas of the screened compounds on the first total ion flow diagram and the third total ion flow diagram, and comparing the similarity S with the lower limit value S of the similarity0According to the similarity S and the lower limit value S of the similarity0The fluid connectivity of the first reservoir and the second reservoir is determined.
The invention also provides equipment for judging the connectivity of the reservoir fluid, which comprises a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor, when executing the computer readable program, performs the steps of the method for determining reservoir fluid connectivity provided by the present invention.
The present invention also provides a computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to perform the steps in the method for determining reservoir circulation provided by the present invention.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: extracting crude oil of two different layers or two different well positions of the same oil reservoir, obtaining gas chromatography fingerprints of two samples through GC/MS test, calculating a lower limit value of similarity according to peak areas of characteristic compound combinations, calculating the similarity of the crude oil gas chromatography fingerprint of the other oil reservoir and the characteristic compound combinations of the crude oil gas chromatography fingerprint of the oil reservoir, comparing the similarity with the lower limit value, and quantitatively judging the connectivity of the two oil reservoirs, thereby guiding oil and gas exploitation at the initial stage of oil field development, particularly at the elastic energy development stage.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a method for determining reservoir fluid connectivity provided by the present invention;
FIG. 2 is an ion flow diagram of an oil sample taken from the IV layer of a G9 well in a certain field in the Qinhuang island;
FIG. 3 is an ion flow diagram of an oil sample taken from the first layer of a well in the B23 field of the King island, Qinhuang;
FIG. 4 is an ion flow diagram of an oil sample taken from the LD5-2-3 well I I layer of a certain oil field in the Qinhuang island.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to verify the feasibility of the technical scheme provided by the invention, three wells (G9 well, B23 well and LD5-2-3 well) of a certain oil field in Qinhuang island are taken as research objects, earlier research proves that the IV layer of the G9 well and the I layer of the B23 well belong to the same oil reservoir, and the method for judging the fluid connectivity of the reservoir is applied to judge whether the IV layer of the LD5-2-3 well I I and the IV layer of the G9 well or the I layer of the B23 well belong to the same oil reservoir, wherein the judging method comprises the following steps (shown in figure 1):
s1, obtaining a first oil sample and a second oil sample obtained after sampling a first oil reservoir, and obtaining a third oil sample obtained after sampling a second oil reservoir, wherein the first oil sample and the third oil sample belong to different layers or different well positions, in the embodiment, the first oil sample is collected from a G9 well IV layer, the second oil sample is collected from a B23 well I layer, and the third oil sample is collected from an LD5-2-3 well I I layer;
s2, performing GC/MS detection on the first oil sample, the second oil sample and the third oil sample respectively to obtain a first total ion flow diagram (see FIG. 2) of the first oil sample, a second total ion flow diagram (see FIG. 3) of the second oil sample and a third total ion flow diagram (see FIG. 4) of the third oil sample;
s3, according to the obtained first and second total ion flow graphs, calculating a difference between peak areas of each compound on the first and second total ion flow graphs (see table 1), and screening out a compound (see table 2) having an absolute value of the difference greater than a first preset value, where the first preset value is 100000-150000 in this embodiment, and the first preset value is 150000;
table 1: peak area of each compound in ion flow graph of three wells of certain oil field in Qinhuang island
S4 calculating the similarity of the peak areas of the screened compounds on the first total ion flow diagram and the second total ion flow diagram to obtain a lower limit value S of the similarity0(see Table 2), in this example, the lower limit value S of the similarity0In the actual production of the oil field, the lower limit value of the similarity of the reservoir fluid connectivity may have a certain difference due to the influences of different aspects such as different oil field reservoir deposit scales, deposit phase zones, the adopted development layer system, and different sampling wells for calculating the lower limit value of the similarity. Generally, the more single the reservoir horizon is and the smaller the transverse distance is, the larger the similarity value is;
s5 calculating the similarity S of the peak areas of the screened compounds on the first total ion flow diagram and the third total ion flow diagram according to the obtained first total ion flow diagram and the third total ion flow diagram, and comparing the similarity S with the lower limit value S of the similarity0According to the similarity S and the lower limit value S of the similarity0The fluid connectivity of the first reservoir and the second reservoir is determined. Specifically, the method for judging the fluid connectivity of the first oil reservoir and the second oil reservoir comprises the following steps: if S<S0And if not, acquiring other geological data, and judging the fluid connectivity of the first oil reservoir and the second oil reservoir by combining the other geological data. In this example, the similarity between the peak areas of the LD5-2-3 well I I layer and the G9 well IV layer is 0.47, the similarity between the peak areas of the LD5-2-3 well I I layer and the B23 well I layer is 0.51, and both are far lower than the lower limit value S of the similarity0Therefore, the LD5-2-3 well I I layer and the G9 well IV layer or the B23 well I layer can be judged not to belong to the same oil reservoir.
Table 2: peak area of compound screened from ion flow graph of three wells in certain oil field of Qinhuang island
Specifically, the other geological data at least comprises logging data, production dynamic data and seismic data, and the oil reservoir communication condition can be objectively and truly reflected through cross validation of various types of geological data.
Further, the step S3 is followed by: performing GC/MS detection on the first oil sample again to obtain a fourth total ion flow diagram (not shown) of the first oil sample, calculating the similarity of the peak areas of the screened compounds on the first total ion flow diagram (figure 2) and the fourth total ion flow diagram to obtain an upper limit value S of the similarity1And according to the upper limit value S of the similarity1The reliability of the test result is judged according to the size of the test result. Specifically, the method for judging the reliability of the test result is as follows: when the upper limit value S of the similarity is reached1When the value is larger than the second preset value, the test result is judged to be reliable; when the upper limit value S of the similarity is reached1When the value is not more than the second preset value, the test result is judged to be unreliable, and the upper limit value S of the similarity is recalculated after the error source is eliminated1Up to the upper limit value S of the similarity1Greater than the second preset value. In this embodiment, the second preset value is 98%. The determination of the upper limit value of the similarity is actually a verification on the experimental process, the accuracy and the feasibility, theoretically, the similarity of the same oil sample is 100%, and the experimental error is less than 2% within the error allowable range.
Specifically, the similarity lower limit value S0And the similarity S are calculated by the corel function.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
The invention also provides equipment for judging the connectivity of the reservoir fluid, which comprises a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor implements the steps of the method for determining reservoir fluid connectivity when executing the computer readable program, and the method for determining reservoir fluid connectivity is described in detail above and will not be described herein again.
In conclusion, the invention extracts the crude oil of two different layers or two different well positions of the same oil reservoir, obtains the gas chromatography fingerprints of two samples through GC/MS test, calculates the lower limit value of the similarity according to the peak area of the characteristic compound combination, then calculates the similarity between the crude oil gas chromatography fingerprint of the other oil reservoir and the characteristic compound combination of the crude oil gas chromatography fingerprint of the oil reservoir, compares the similarity with the lower limit value of the similarity, and quantitatively judges the connectivity of the two oil reservoirs, thereby guiding the oil and gas exploitation in the initial stage of the oil field, particularly in the elastic energy exploitation stage.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method of determining reservoir fluid connectivity, comprising the steps of:
(1) acquiring a first oil sample and a second oil sample obtained after sampling a first oil reservoir, and acquiring a third oil sample obtained after sampling a second oil reservoir, wherein the first oil sample and the third oil sample belong to different layers or different well positions;
(2) performing GC/MS detection on the first oil sample, the second oil sample and the third oil sample respectively to obtain a first total ion flow diagram of the first oil sample, a second total ion flow diagram of the second oil sample and a third total ion flow diagram of the third oil sample;
(3) calculating peak areas of the compounds on the first total ion flow diagram and the second total ion flow diagram according to the obtained first total ion flow diagram and the second total ion flow diagram, and screening out the compounds of which the absolute values of the differences are larger than a first preset value;
(4) calculating the similarity of the peak areas of the screened compounds on the first total ion flow diagram and the second total ion flow diagram to obtain a lower limit value S of the similarity0；
(5) According to the obtained first total ion flow diagram and the third total ion flow diagram, calculating the similarity S of the peak areas of the screened compounds on the first total ion flow diagram and the third total ion flow diagram, and comparing the similarity S with the lower limit value S of the similarity0According to the similarity S and the lower limit value S of the similarity0The fluid connectivity of the first reservoir and the second reservoir is determined.
2. The method for determining reservoir fluid connectivity according to claim 1, wherein the first predetermined value is 100000-150000.
3. The method for determining fluid connectivity of a reservoir according to claim 1, wherein in the step (5), the method for determining fluid connectivity of the first reservoir and the second reservoir comprises:
if S<S0And if not, acquiring other geological data, and judging the fluid connectivity of the first oil reservoir and the second oil reservoir by combining the other geological data.
4. The method of determining reservoir fluid connectivity of claim 3, wherein the other geological data comprises at least well log data, production dynamics data, and seismic data.
5. The method for determining reservoir fluid connectivity according to claim 1, wherein step (3) is further followed by: performing GC/MS detection on the first oil sample again to obtain a fourth total ion flow diagram of the first oil sample, calculating the similarity of the peak areas of the screened compounds on the first total ion flow diagram and the fourth total ion flow diagram, and obtaining an upper limit value S of the similarity1And according to the upper limit value S of the similarity1The reliability of the test result is judged according to the size of the test result.
6. The method for determining reservoir fluid connectivity according to claim 5, wherein the reliability of the test results is determined by:
when the upper limit value S of the similarity is reached1When the value is larger than the second preset value, the test result is judged to be reliable; when the upper limit value S of the similarity is reached1When the value is not more than the second preset value, the test result is judged to be unreliable, and the upper limit value S of the similarity is recalculated after the error source is eliminated1Up to the upper limit value S of the similarity1Greater than the second preset value.
7. The method of determining reservoir fluid connectivity of claim 6, wherein the second predetermined value is 98%.
8. The method for determining reservoir fluid connectivity of claim 1, wherein the lower similarity threshold value S0And the similarity S is obtained by calculating through a CORREL function.
9. An apparatus for determining reservoir fluid connectivity, comprising a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, performs the steps of the method of determining reservoir fluid connectivity as claimed in any one of claims 1-8.
10. A computer readable storage medium, storing one or more programs, the one or more programs being executable by one or more processors to perform the steps of the method for determining reservoir connectivity of any of claims 1-8.
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Cited By (1)
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| CN115078599A (en) * | 2021-03-10 | 2022-09-20 | 中国石油化工股份有限公司 | Reservoir connectivity evaluation method based on crude oil full-component concentration |
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