CN117865919A - Organic tracer, preparation method thereof, interwell tracing method and application of polycyclic aliphatic ether compound as organic tracer - Google Patents
Organic tracer, preparation method thereof, interwell tracing method and application of polycyclic aliphatic ether compound as organic tracer Download PDFInfo
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- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 106
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 title claims abstract description 36
- -1 polycyclic aliphatic ether compound Chemical class 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000011282 treatment Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims abstract description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 26
- 239000002904 solvent Substances 0.000 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- 125000001424 substituent group Chemical group 0.000 claims description 12
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052736 halogen Inorganic materials 0.000 claims description 8
- 150000002367 halogens Chemical class 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 8
- 125000000229 (C1-C4)alkoxy group Chemical group 0.000 claims description 7
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 4
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 abstract 1
- 125000003367 polycyclic group Chemical group 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 20
- 239000003921 oil Substances 0.000 description 11
- 230000014759 maintenance of location Effects 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229940125904 compound 1 Drugs 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000000589 high-performance liquid chromatography-mass spectrometry Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229940126214 compound 3 Drugs 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to the technical field of oilfield tracers, and discloses an organic tracer, a preparation method thereof, an interwell tracing method and application of a polycyclic aliphatic ether compound as the organic tracer. The multi-ring aliphatic ether compound is used as an organic tracer, and the interwell tracing method comprises the steps of calculating and determining the dosage of the organic tracer; the organic tracer is injected together with the fracturing fluid in the use process; sampling a monitoring well; and carrying out standardized treatment, detection and analysis on the sample, and drawing a yield curve of the organic tracer. The invention discovers that the selected polycyclic aliphatic alcohol ether chemical tracer has the advantages of low dosage, small adsorption, high stability and low detection limit, can be used for an interwell tracing technology, and effectively solves the problems of large dosage, high cost, serious environmental pollution and the like of the existing oilfield tracer.
Description
Technical Field
The invention relates to the technical field of oilfield tracers, in particular to an organic tracer, a preparation method thereof, an interwell tracing method and application of a polycyclic aliphatic ether compound as the organic tracer.
Background
The tracing technology can be divided into inter-well tracing, single-well tracing, multi-section fracturing tracers and the like according to different application scenes, and the types and the performances of the tracers are different to a certain extent according to different purposes of use.
According to the prior art of oilfield tracer technology (industrial water treatment, 8 th month, 27 th volume, 8 th period, daphne, etc.), oilfield usual tracers include chemical tracers, radioactive isotope tracers, non-radioactive isotope tracers, trace substance tracers. Traditional chemical tracers are rich in variety, including inorganic salts, low molecular weight alcohols, fuels, and the like. However, the existing chemical tracer has the defects of high usage, large adsorption, easy degradation and high detection limit; there is also a need to further develop new chemical tracers to overcome the above mentioned drawbacks, thereby increasing the application potential of the chemical tracers.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an organic tracer, a preparation method thereof, an interwell tracing method and application of a polycyclic aliphatic ether compound as the organic tracer. The invention discovers that the selected polycyclic aliphatic alcohol ether compound is used as the organic tracer agent, has the advantages of low dosage, small adsorption, high stability and low detection limit, can be used for the interwell tracing technology, and effectively solves the problems of large dosage, high cost, serious environmental pollution and the like of the existing oilfield tracer agent.
In order to solve the technical problems, the invention adopts the following technical proposal
It is an object of the present invention to provide an organic tracer comprising at least one of polycyclic aliphatic ether compounds.
In the organic tracer according to the invention, preferably,
the polycyclic aliphatic ether compound is an aliphatic alcohol ether compound containing a bridged ring structure.
Preferably, the method comprises the steps of,
the structural general formula of the aliphatic alcohol ether compound containing the bridged ring structure is as follows:
wherein, (R) 1 ) n represents n R's on the bridged ring 1 Substituents, and n R 1 The substituents are the same or different and are each independently selected from one of H, C C4 alkyl (such as methyl, ethyl, propyl, butyl), C1C 4 alkoxy, carbonyl or halogen;
the value of n ranges from 0 to 9, preferably from 0 to 5, more preferably from 0 to 3, for example, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9; and when R is 1 When there are plural substituents, R 1 The substituents may be attached to different carbon atoms, or two carbon atoms may be attached to the same carbon atom.
The R is 2 、R 3 The same or different, each independently selected from one of hydrogen and C1-C4 alkyl.
In the present invention, R 1 The substituents refer to groups which replace a hydrogen atom on the bridged ring, i.e. unless explicitly indicated otherwise, except for R 1 、R 2 、R 3 Besides, the bridge ring has no other substituent groups and is a hydrogen atom.
Preferably, the method comprises the steps of,
the C1-C4 alkyl is selected from one of methyl or ethyl;
the C1-C4 alkoxy is selected from one of methoxy or ethoxy;
the halogen is selected from fluorine.
Preferably, the method comprises the steps of,
the aliphatic alcohol ether compound containing the bridged ring structure is selected from the group consisting of:
at least one of them.
Preferably, the method comprises the steps of,
the organic tracer further comprises a solvent.
Preferably, the method comprises the steps of,
the solvent is an organic solvent, and further preferably, the organic solvent is at least one selected from n-octane, ethyl acetate, ethanol, or tetrahydrofuran.
Preferably, the method comprises the steps of,
the concentration range of the polycyclic aliphatic ether compound in the solvent is 0.5 to 10 weight percent.
In the present invention, the organic tracer may be added with other substances commonly used in the art according to the use requirements.
Another object of the present invention is to provide a method for producing an organic tracer according to one of the objects of the present invention, the method comprising the steps of: and uniformly mixing the polycyclic aliphatic ether compound and optionally a solvent to obtain the organic tracer.
A third object of the present invention is to provide an inter-well tracing method of an organic tracer according to one of the objects of the present invention, comprising:
and adding the organic tracer into an injection well, sampling in a production well, and drawing a tracer yield curve.
Preferably, the inter-well tracing method comprises:
(1) Calculating and determining the dosage of the organic tracer according to the average effective thickness of the oil layer, the porosity of the oil layer, the water saturation of the oil layer, the injection well spacing and the highest value of the output concentration of the organic tracer;
(2) The organic tracer is injected together with the fracturing fluid in the use process;
(3) Sampling a monitoring well;
(4) And carrying out standardized treatment, detection and analysis on the sample, and drawing a yield curve of the organic tracer.
Preferably, the calculation formula of the organic tracer amount is as follows:
h, the average effective thickness of the oil layer is expressed in meters;-oil layer porosity in Darcy; s is S w -the oil layer contains water saturation in units of; c (C) p，max The highest value of the output concentration of the organic tracer (generally taking more than 10 times of the lowest detection limit concentration according to experience) is expressed in mg/L; an alpha-dispersion constant, wherein the value of alpha is 0.0005-0.003, preferably 0.001; l-injection well spacing, the unit is m; m is the dosage of the tracer, and the unit is Kg; and/or the number of the groups of groups,
the sampling period of the step (3) is 30 days to 180 days.
The organic tracer is generally used in the present invention in an amount of about several tens to several hundreds of kg. The organic tracer may be added from the injection well in a single dose or formulated as a solution; the injection concentration of the organic tracer along with the fracturing fluid needs to be determined according to a detection method, and the detection limit of the detection method can be met.
More preferably, the present invention specifically adopts the following technical scheme:
1) Analyzing the oilfield produced fluid, selecting a tracer for the formation, the tracer for the formation selected from compounds not contained in the formation;
2) Design embodiments;
3) Calculating the dosage of the tracer;
4) Injecting an organic tracer in an injection well using a pump truck or other equipment;
5) Sampling in a monitoring well according to a formulated sampling system;
6) Carrying out standardized treatment on the sample;
7) Detecting and analyzing the produced liquid by utilizing a corresponding analysis means; the analytical means are conventional in the art;
8) Drawing a tracer yield curve;
9) Performing simulation calculation by using conventional tracer digital-analog software;
10 Complete the comprehensive analysis test report.
The fourth object of the present invention is to provide an application of a polycyclic aliphatic ether compound as an organic tracer, wherein the polycyclic aliphatic ether compound is preferably an aliphatic alcohol ether compound containing a bridged ring structure; it is further preferred that the composition comprises,
the structural general formula of the aliphatic alcohol ether compound containing the bridged ring structure is as follows:
wherein, (R) 1 ) n represents n R's on the bridged ring 1 Substituents, and n R 1 The substituent groups are the same or different and are each independently selected from one of C1-C4 alkyl, C1-C4 alkoxy, carbonyl or halogen;
the value of n ranges from 0 to 9, preferably from 0 to 5, more preferably from 0 to 3;
the R is 2 、R 3 The same or different, each independently selected from one of hydrogen and C1-C4 alkyl.
In the use according to the invention, the method, preferably,
the C1-C4 alkyl is selected from one of methyl or ethyl; and/or the number of the groups of groups,
the C1-C4 alkoxy is selected from one of methoxy or ethoxy; and/or the number of the groups of groups,
the halogen is selected from fluorine.
In the use according to the invention, the method, preferably,
the aliphatic alcohol ether compound containing the bridged ring structure is selected from the group consisting of:
at least one of them.
In the use according to the invention, the method, preferably,
the organic tracer further comprises a solvent; the solvent is preferably an organic solvent, more preferably, the organic solvent is at least one selected from n-octane, ethyl acetate, ethanol, or tetrahydrofuran; most preferably, the concentration of the polycyclic aliphatic ether compound in the solvent ranges from 0.5wt% to 10wt%.
The endpoints of the ranges and any values disclosed in the present invention are not limited to the precise range or value, and the range or value should be understood to include values close to the range or value. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein. In the following, the individual technical solutions can in principle be combined with one another to give new technical solutions, which should also be regarded as specifically disclosed herein.
Compared with the prior art, the invention has at least the following advantages:
the invention discovers that the aliphatic alcohol ether compound containing the bridged ring structure can be used as an interwell tracer, and when the aliphatic alcohol ether compound is used as an organic tracer, the detection is sensitive and the detection limit is low, each tracer does not react directly, does not interfere with each other, and can be used for an interwell tracer technology of an oil field.
The organic tracer of the invention has smaller dosage, the detection limit can reach 0.1mg/L, the usage amount of the oilfield tracer is greatly reduced, and the excessive usage amount is easy to cause the pollution of the oil reservoir stratum.
Drawings
FIG. 1 is a standard curve of sensitivity detection of an organic tracer of the invention;
FIG. 2 is a graph showing the results of detection of produced fluid when the organic tracer of the invention is applied to a site;
wherein the peak area in fig. 1 is in units of AU min;
in fig. 2, ointracer 1 is the detection result of the organic tracer corresponding to compound 1, and ointracer 2 is the detection result of the organic tracer corresponding to compound 3.
Detailed Description
The present invention is described in detail below with reference to the specific drawings and examples, and it is necessary to point out that the following examples are given for further illustration of the present invention only and are not to be construed as limiting the scope of the present invention, since numerous insubstantial modifications and adaptations of the invention to those skilled in the art will still fall within the scope of the present invention.
In addition, the specific features described in the following embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention can be made, so long as the concept of the present invention is not deviated, and the technical solution formed thereby is a part of the original disclosure of the present specification, and also falls within the protection scope of the present invention.
The raw materials used in the examples and comparative examples are all disclosed in the prior art and are all commercially available; can also be prepared according to the preparation methods disclosed in the prior art.
The calculation formula of the retention rate of the organic tracer is as follows: c (C) Existing concentration /C Initial concentration Wherein C Existing concentration 、C Initial concentration Detection was performed using HPLC-MS.
Example 1
The tracers in the following table are respectively prepared into n-octane solution with the concentration of 100mg/L, the n-octane solution is aged at 70 ℃, the container is 50mL of pressure bomb, the concentration test is carried out by sampling when the n-octane solution is aged for 60 days, the retention rate is calculated, and the calculation formula of the retention rate is as follows: c (C) Existing concentration /C Initial concentration The experimental results are shown in table 1:
TABLE 1
Example 2
The tracers in the following table are respectively prepared into n-octane solutions with the concentration of 100mg/L, and saline solutions with different mineralization degrees are added, wherein the volume ratio of the tracer solution to the saline solution is 1:1. Aging is carried out at 70 ℃, the container is 50mL of pressure bomb, aging is carried out for 30 days, sampling is carried out for concentration test, the calculation formula for calculating the retention rate and the retention rate is the same as that of example 1, the experimental results are shown in table 2, and the table 2 shows that the tracer has higher salt resistance and consistent stability under different salinity.
TABLE 2
Example 3
Preparing the following tracers into a mixed solution by using n-octane for static adsorption experiments, wherein the concentration of each tracer sample in the mixed solution is 100mg/L; the results are shown in Table 3. In quartz sand or kaolin, the adsorption capacity of the tracer is smaller than 0.1mg/g, the adsorption capacity is lower, and the tracer is prevented from being greatly lost in the stratum.
TABLE 3 Table 3
Example 4
Preparing a mixed solution of the following tracers by using n-octane, wherein the concentration of each tracer sample in the mixed solution is 100mg/L; the mixed solution was detected by liquid chromatography. Judging whether the tracer agents of the type interfere with each other or not, and influencing the detection result. The experimental results are shown in Table 4. The experimental result shows that the detection result of the tracer in the mixed solution is close to the configuration concentration, and the mutual interference of the tracer is less.
TABLE 4 Table 4
Example 5
The following tracers were each prepared as an n-octane solution having a concentration of about 100mg/L, and observed at 80℃to see whether or not the solutions were precipitated. After 24 hours of high-temperature aging, the experimental results are shown in Table 5, and the experimental results show that the tracer has higher solubility and can not be precipitated.
TABLE 5
Example 6
The following tracers are respectively prepared into n-octane solutions with the concentration of about 100mg/L, a displacement experiment is carried out at 70 ℃, an artificial rock core is used, the permeability is 500mD, a fixed volume of solution is injected into the rock core, the concentration analysis and detection are carried out on the extracted solution, the retention rate of the tracers is calculated in the displacement experiment, and the experimental results are shown in Table 6. The displacement experiment result shows that the organic tracer provided by the invention has lower adsorption quantity in the rock core and has potential as an interwell tracer.
TABLE 6
Example 7
The tracers in the following table are formulated as n-octane solutions at a concentration of about 100mg/L, respectively, and are adjusted to pH 6.4 and 10.6 (pH adjusters are currently used pH adjusters, such as very dilute sodium hydroxide solution). Aging at 70 ℃, sampling and testing the concentration when the container is 50mL of pressure bomb and aging for 60 days, and calculating the retention rate, wherein the calculation formula of the retention rate is as follows: c (C) Existing concentration /C Initial concentration The experimental results are shown in table 7:
TABLE 7
Example 8
And (3) selecting an organic tracer corresponding to the compound 1 for a detection limit experiment, preparing organic tracer solutions with the concentration of 0.05,0.1,0.3,0.5,1.0,2.5,5, 10, 25 and 50mg/L and 9 different concentrations, detecting by using HPLC-MS, and preparing an analysis standard curve of the compound, wherein the specific test result is shown in figure 1.
As can be seen in FIG. 1 of the present invention, when the concentration of the configured solution was continuously diluted from 0.1mg/L to 0.05mg/L, the concentration still exhibited a linear law, but at lower concentrations the peak area was too low to integrate accurately, so the lowest detection limit was considered to be 0.1mg/L.
Example 9
Field application experiment:
selecting a well-winning oilfield fracturing site, and selecting two tracers for two sections of cracks:
the first tracer is compound 1 and the second tracer is compound 3, which are added to two sections of cracks, one tracer for each crack. The dosage of each section of fracturing fluid is 200 cubic, and the calculation formula of the dosage of the tracer is as follows:
h, the average effective thickness of the oil layer is expressed in meters;-oil layer porosity in Darcy; s is S w -the oil layer contains water saturation in units of; c (C) p，max -highest value of organic tracer yield concentration (10 times the lowest limit of detection), in mg/L; an alpha-dispersion constant, wherein the value of alpha is 0.001; l-injection well spacing, the unit is m; through calculation, 10Kg of tracer is added into 200 cubes of the fracturing fluid, the tracer is injected together with the fracturing fluid, the produced fluid is taken out at fixed time for detection during recovery, the sampling period is 30 days, and curve drawing is carried out. The crude oil part in the produced liquid is taken out, pretreatment and HPLC-MS detection are carried out, the concentration of the tracer is measured, and the detection result of the produced liquid is shown in figure 2. As can be seen from fig. 2, the fracturing situation is well reversed, and at day 6, the injected tracer is detected.
The results show that the organic tracer provided by the invention has the advantages of low dosage, small adsorption, high stability and low detection limit, can be used for an interwell tracing technology, and effectively solves the problems of high dosage, high cost, serious environmental pollution and the like of the conventional oilfield tracer.
The invention has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the invention. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, and these fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (16)
1. An organic tracer comprising at least one of a polycyclic aliphatic ether compound.
2. An organic tracer according to claim 1, wherein,
the polycyclic aliphatic ether compound is an aliphatic alcohol ether compound containing a bridged ring structure.
3. An organic tracer according to claim 2, wherein,
the structural general formula of the aliphatic alcohol ether compound containing the bridged ring structure is as follows:
wherein, (R) 1 ) n represents n R's on the bridged ring 1 Substituents, and n R 1 The substituent groups are the same or different and are each independently selected from one of C1-C4 alkyl, C1-C4 alkoxy, carbonyl or halogen;
the value of n ranges from 0 to 9, preferably from 0 to 5, more preferably from 0 to 3;
the R is 2 、R 3 The same or different, each independently selected from one of hydrogen and C1-C4 alkyl.
4. An organic tracer according to claim 3, wherein,
the C1-C4 alkyl is selected from one of methyl or ethyl;
the C1-C4 alkoxy is selected from one of methoxy or ethoxy;
the halogen is selected from fluorine.
5. An organic tracer according to claim 4, wherein,
the aliphatic alcohol ether compound containing the bridged ring structure is selected from the group consisting of:
at least one of them.
6. An organic tracer according to any of claims 1-5, wherein,
the organic tracer further comprises a solvent.
7. An organic tracer according to claim 6, wherein,
the solvent is an organic solvent, preferably, the organic solvent is at least one selected from n-octane, ethyl acetate, ethanol or tetrahydrofuran.
8. An organic tracer according to claim 6, wherein,
the concentration range of the polycyclic aliphatic ether compound in the solvent is 0.5 to 10 weight percent.
9. A method of preparing an organic tracer according to any one of claims 1 to 8, the method comprising the steps of: and uniformly mixing the polycyclic aliphatic ether compound and optionally a solvent to obtain the organic tracer.
10. An interwell tracing method of an organic tracer according to claims 1-8, comprising:
and adding the organic tracer into an injection well, sampling in a production well, and drawing a tracer yield curve.
11. An interwell tracing method according to claim 10, wherein the interwell tracing method comprises:
(1) Calculating and determining the addition amount of the organic tracer according to the average effective thickness of the oil layer, the porosity of the oil layer, the water saturation of the oil layer, the injection well spacing and the highest value of the output concentration of the organic tracer;
(2) The organic tracer is injected together with the fracturing fluid in the use process;
(3) Sampling a monitoring well;
(4) And carrying out standardized treatment, detection and analysis on the sample, and drawing a yield curve of the organic tracer.
12. An interwell tracing method according to claim 11, wherein:
the calculation formula of the dosage of the organic tracer is as follows:
h, the average effective thickness of the oil layer is expressed in meters;-oil layer porosity in Darcy; s is S w -the oil layer contains water saturation in units of; c (C) p，max -highest value of the organic tracer yield concentration in mg/L; an alpha-dispersion constant, wherein the value of alpha is 0.0005-0.003, preferably 0.0015; l-injection well spacing, the unit is m; m is the dosage of the tracer, and the unit is Kg; and/or the number of the groups of groups,
the sampling period of the step (3) is 30 days to 180 days.
13. Use of a polycyclic aliphatic ether compound as an organic tracer, wherein the polycyclic aliphatic ether compound is preferably an aliphatic alcohol ether compound containing a bridged ring structure; it is further preferred that the composition comprises,
the structural general formula of the aliphatic alcohol ether compound containing the bridged ring structure is as follows:
wherein, (R) 1 ) n represents n R's on the bridged ring 1 Substituents, and n R 1 The substituent groups are the same or different and are each independently selected from one of C1-C4 alkyl, C1-C4 alkoxy, carbonyl or halogen;
the value of n ranges from 0 to 9, preferably from 0 to 5, more preferably from 0 to 3;
the R is 2 、R 3 The same or different, each independently selected from one of hydrogen and C1-C4 alkyl.
14. The use according to claim 13, characterized in that,
the C1-C4 alkyl is selected from one of methyl or ethyl; and/or the number of the groups of groups,
the C1-C4 alkoxy is selected from one of methoxy or ethoxy; and/or the number of the groups of groups,
the halogen is selected from fluorine.
15. The use according to claim 13, characterized in that,
the aliphatic alcohol ether compound containing the bridged ring structure is selected from the group consisting of:
at least one of them.
16. The use according to claim 13, characterized in that,
the organic tracer further comprises a solvent; the solvent is preferably an organic solvent, more preferably, the organic solvent is at least one selected from n-octane, ethyl acetate, ethanol, or tetrahydrofuran; most preferably, the concentration of the polycyclic aliphatic ether compound in the solvent ranges from 0.5wt% to 10wt%.
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