CN114382464B - Method for screening radioactive isotope logging tracer agent underground - Google Patents
Method for screening radioactive isotope logging tracer agent underground Download PDFInfo
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- CN114382464B CN114382464B CN202210053060.4A CN202210053060A CN114382464B CN 114382464 B CN114382464 B CN 114382464B CN 202210053060 A CN202210053060 A CN 202210053060A CN 114382464 B CN114382464 B CN 114382464B
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- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 113
- 238000012216 screening Methods 0.000 title claims abstract description 51
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 230000005484 gravity Effects 0.000 claims abstract description 40
- 238000003795 desorption Methods 0.000 claims abstract description 9
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 27
- 239000007924 injection Substances 0.000 abstract description 27
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000011109 contamination Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- PNDPGZBMCMUPRI-HVTJNCQCSA-N 10043-66-0 Chemical compound [131I][131I] PNDPGZBMCMUPRI-HVTJNCQCSA-N 0.000 description 1
- 101710134784 Agnoprotein Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-VENIDDJXSA-N barium-131 Chemical compound [131Ba] DSAJWYNOEDNPEQ-VENIDDJXSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
- E21B47/111—Locating fluid leaks, intrusions or movements using tracers; using radioactivity using radioactivity
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a method for screening a radioactive isotope logging tracer agent underground, which comprises the following steps: adding the mixed tracer into an isotope bin of a screening device; opening a valve, and soaking the isotope tracer in the injection water; closing the valve, and keeping the injected water in the isotope bin in a static state; in a static state, the tracer in the isotope bin is layered, and is suspended with the tracer with the same specific gravity as the injected water, so that the isotope logging tracer with the specific gravity which is most similar to that of the injected water of the planned logging section can be screened out; the tracer agent which is matched with the specific gravity of the injected water best can be screened out, the problem that isotope logging data is unqualified due to the fact that the specific gravity of the tracer agent is not matched is solved, and the method is particularly significant for different logging blocks, water injection with different mineralization degrees and fine logging of an oil field. The crushing rate and isotope desorption rate of the tracer are detected by means of a high-pressure and real temperature environment of underground injected water instead of a large and expensive ultrahigh-pressure generating device during ground detection, so that the problems of radioactive contamination and data distortion are avoided.
Description
Technical Field
The invention relates to the technical field of oil field logging tools, in particular to a method for screening a radioactive isotope logging tracer underground.
Background
Water injection is the foundation of stable production of the oil field, is an important means for improving the development effect of water injection and the continuous stable production of the oil field, and because the injection profile logging is the core content of water injection exploitation and oil displacement by water, the logging information of the injection profile logging is used for monitoring the injection dynamics of a single well, revealing the contradiction between layers and in layers and providing scientific basis for adjusting the injection profile (such as layered injection allocation and profile control, water plugging and profile control, acidification and fracturing); providing logging information for adjusting well groups and regional injection-production relations; through the research on injection profile logging and the analysis and comparison of underground dynamic and static data, the liquid production profiles of adjacent oil wells can be indirectly known, and scientific support is provided for comprehensive regulation of a scheme and improvement of recovery efficiency. The isotope injection profile logging is widely applied to oil fields all the time due to simple construction process and low construction cost. The optimum condition of isotope injection profile well logging is that the specific gravity of isotope is identical to that of injected water, and the tracer is in suspension state in water, otherwise, the tracer can float and sink, so that the well logging data is distorted, and the isotope well logging data is unqualified. However, the water injection modes of oil reservoirs of oil fields are different, the water quality difference is large, the mineralization degrees of underground water in different regions are different, and even the specific gravity of water in the same well changes along with the change of depth and temperature, so that the existing method for sorting the specific gravity of the tracer by an isotope logging tracer manufacturer on the ground is difficult to consider the specific gravity difference of injected water in different logging blocks and different well depths, and difficult to meet the logging requirements of layered water injection and fine water displacement of most of the current oil fields.
Disclosure of Invention
The invention aims to provide a method for screening a radioactive isotope logging tracer underground aiming at the defects of the prior art.
The invention adopts the following technical scheme:
a radioactive isotope well logging tracer downhole screening method, the adopted radioactive isotope well logging tracer downhole screening device comprises a device body 1, an upper isotope bin 14, a middle isotope bin 16 and a lower isotope bin 18 which are arranged in the device body 1; the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 are sequentially arranged from top to bottom in the vertical direction, namely the middle isotope bin 16 is positioned between the upper isotope bin 14 and the lower isotope bin 18, and the upper isotope bin 14 is positioned at the upper part of the middle isotope bin 16; the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 are communicated, and porous valves are arranged at the communication positions of the upper isotope bin, the middle isotope bin and the lower isotope bin; the method specifically comprises the following steps: a second porous valve 15 is arranged between the upper isotope bin 14 and the middle isotope bin 16; a third porous valve 17 is arranged between the middle isotope bin 16 and the lower isotope bin 18; a first porous valve 13 and a first valve 12 are arranged at the upper opening position of the upper isotope bin 14, and the first valve 12 is positioned at the outermost part; a fourth porous valve 19 and a second valve 20 are arranged at the lower opening position of the lower syngen cabin 18, and the second valve 20 is positioned at the outermost part;
the method comprises the following steps:
step (1), loading tracer into a bin: the first valve 12 and the first valve 20, the first porous valve 13 and the second porous valve 15 are unscrewed, the third porous valve 17 and the fourth porous valve 19 are closed, and the mixed tracer is added above the third porous valve 17 in the isotope bin 16 of the screening device; during the addition process, the friction between the mixed tracer and the catheter can reduce the collision force between the tracer and the porous valve 17;
step (2), the screening device puts in: releasing the screening device to a downhole well-logging-planned section, wherein the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 are sequentially arranged from top to bottom in the vertical direction; opening a first valve 12 and a second valve 20, enabling injected water of a well to be tested section to enter an upper isotope bin 14, a middle isotope bin 16 and a lower isotope bin 18 through the first valve 12, a first porous valve 13, a second porous valve 15, a third porous valve 17, a fourth porous valve 19 and the second valve 20, soaking an isotope tracer in the middle isotope bin 16 in the injected water, and after a period of time, sequentially closing the first valve 12 and the second valve 20 when the middle isotope bin 16 has the same pressure and temperature as the injected water, wherein the injected water in the middle isotope bin 16, the upper isotope bin 14 and the lower isotope bin 18 is in a static state;
and (3) layering a tracer: when the flow of the injected water in the isotope bin 16 stops, the second porous valve 15 is opened, and the tracer with small specific gravity floats upwards to enter the upper isotope bin 14; opening a third porous valve 17, and allowing the isotope tracer with high specific gravity to enter a lower isotope bin 18; after a period of time, stopping layering, and closing the second porous valve 15 and the third porous valve 17 in sequence, wherein the radioactive isotope logging tracer in the middle isotope bin 16 is the screened tracer;
step (4), the screening device provides: after the screening device is lifted out of the wellhead, the radioactive isotope logging tracer in the isotope bin 16 is taken out, and the specific gravity, the breaking rate and the isotope desorption rate of the screened tracer are tested under 1 standard atmospheric pressure on the ground.
In the method for screening the radioactive isotope logging tracer under the well, in the step (1), in order to further reduce the degree of collision, a valve 20 and porous valves 17 and 19 can be selected to be closed, a valve 12 and porous valves 13 and 15 are opened, water is injected into isotope bins 18 and 16, and when the water in the isotope bin 16 approaches the porous valve 15, the water injection is stopped; the mixed tracer is immersed in water in advance and mixed with water, and the mixed tracer mixed with the water is transferred into the isotope bin 16 through a guide pipe; the valve 20 is opened, water is discharged, and the mixed tracer is filtered and reserved above the porous valve 17; all valves are closed.
In the step (2), the controller 3 respectively controls the pressure measuring unit 4, the temperature measuring unit 5 and the flow rate measuring unit 6 to measure and obtain pressure, temperature and flow rate data at a planned logging section, underground pressure, temperature and flow rate signals are converted into voltage signals, and the voltage signals are uploaded to a ground data acquisition station through the cable 2.
The method for screening the radioactive isotope logging tracer agent underground also comprises the step (5) of sampling underground injected water of a to-be-logged section: and opening the third valve 7 and the fourth valve 10, closing the valves 7 and 10 in sequence after the water taking bin 9 is filled with water, completing sampling of the underground injected water of the logging-planned section, analyzing specific gravity, mineralization degree and component information of the underground injected water on the ground, and performing layering and fine logging.
The method for screening the radioactive isotope logging tracer in the underground well comprises the step (1) of replacing the radioactive isotope logging tracer with non-radioactive barium or iodine, and screening the tracer by using a cold experiment to obtain underground information such as specific gravity, pressure resistance, temperature resistance and the like of the tracer.
According to the method for screening the radioactive isotope logging tracers in the underground, the mixed tracers in the step (1) comprise radioactive isotope logging tracers with different specific gravities, and the radioactive isotope logging tracers with different specific gravities are uniformly mixed according to the same weight.
In the method for screening the radioactive isotope logging tracer agent underground, in the step (1), the mixed tracer agent is added above a third porous valve 17 in an isotope bin 16 of a screening device through a conduit.
According to the method for screening the radioactive isotope logging tracer in the underground mode, in the step (1), the guide pipe is a hollow plastic pipe, the inner diameter of the guide pipe is far larger than the particle size of the isotope tracer, the outer diameter of the guide pipe is far smaller than the inner diameter of an opening of a valve, and the wall thickness of the guide pipe is 1-3 mm.
The method for screening the radioactive isotope well logging tracer can screen the tracer which is most matched with the specific gravity of injected water, solves the problem of unqualified isotope well logging data caused by mismatched specific gravity of the tracer, and is particularly significant for different well logging blocks, water injection with different mineralization degrees and fine well logging in an oil field. The well logging tracer selected in the screening device is influenced by the high temperature and high pressure of the underground injected water at the planned well logging section, a small amount of crushing and isotope desorption phenomena can occur, and the crushing rate and the desorption rate measured on the ground after the screening device is lifted out of a well mouth can represent real underground well logging data. The comprehensive information of the proportion, the pressure, the temperature, the flow velocity, the crushing rate and the desorption rate, the proportion, the mineralization degree, the components and the like of the injected water, which are obtained by the screening device, has important significance for optimizing the tracer agent and the injection and monitoring process thereof, and layering and fine well logging.
Drawings
FIG. 1 is a schematic view of a radioisotope logging tracer downhole screening device;
in the figure: 1. a device body; 2. a cable; 3. a controller; 4. a pressure measuring unit; 5. a temperature measuring unit; 6. a flow rate measuring unit; 7. a third valve; 8. a water injection pipe; 9. a water taking bin; 10. a fourth valve; 11. a drain pipe; 12. a first valve; 13. a first porous valve; 14. an isotope bin is arranged; 15. a second porous valve; 16. a middle isotope bin; 17. A third porous valve; 18. a lower syngen bin; 19. a fourth multi-port valve; 20. a second valve.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Referring to fig. 1, the downhole screening device for a radioactive isotope logging tracer comprises a device body 1, and a controller 3, a pressure measuring unit 4, a temperature measuring unit 5, a flow measuring rate unit 6, an upper isotope bin 14, a middle isotope bin 16 and a lower isotope bin 18 which are arranged inside the device body 1 in a manner known to a skilled person; the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 are sequentially arranged from top to bottom in the vertical direction, namely the middle isotope bin 16 is positioned between the upper isotope bin 14 and the lower isotope bin 18, and the upper isotope bin 14 is positioned at the upper part of the middle isotope bin 16; the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 are communicated through pipelines, and porous valves are arranged at the communication positions among the upper isotope bin, the middle isotope bin and the lower isotope bin; the method specifically comprises the following steps: a second porous valve 15 is arranged between the upper isotope bin 14 and the middle isotope bin 16; a third porous valve 17 is arranged between the middle isotope bin 16 and the lower isotope bin 18; besides, a first porous valve 13 and a first valve 12 are arranged at the upper opening position of the upper isotope bin 14, and the first valve 12 is located at the outermost part; the lower opening position of the lower syngen cabin 18 is provided with a fourth porous valve 19 and a second valve 20, and the second valve 20 is located at the outermost part.
The aperture of the porous valve is smaller than the particle size of the tracer; when the porous valve is opened, liquid and the tracer can freely pass through the porous valve, and when the porous valve is closed, only liquid can pass through the porous valve, but the tracer cannot pass through the porous valve (which is equivalent to a layer of sieve plate); valves 12 and 20 are used for control of the ingress and egress of injected water during tracer screening.
Preferably, the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 are cylindrical bins with the same diameter, and the three cylindrical bins are coaxial.
Preferably, the system further comprises a water taking bin 9 for taking samples of the water injected underground and bringing the samples back to the surface; the water taking bin 9 comprises a water injection pipe 8 and a water discharge pipe 11, and the opening of the water injection pipe 8 and the opening of the water discharge pipe 11 are respectively controlled through a third valve 7 and a fourth valve 10.
And the controller 3 is used for controlling the pressure measuring unit 4, the temperature measuring unit 5 and the flow rate measuring unit 6, converting underground pressure, temperature and flow rate signals into voltage signals and uploading the voltage signals to a ground data acquisition station through the cable 2.
And the pressure measuring unit 4 is used for measuring the well pressure by adopting a pressure measuring circuit constructed by a Wheatstone bridge, and after the output signal is converted into a frequency signal, the single chip microcomputer is used for counting and encoding.
The temperature measuring unit 5 adopts a bridge circuit formed by a high-precision resistor and a platinum resistor temperature sensor for measuring the well temperature, signals output by the temperature sensor are amplified and then sequentially converted into direct current signals and frequency signals, and the direct current signals and the frequency signals are counted by a timing counter in the single chip microcomputer.
The flow rate measuring unit 6 calculates the fluid flow according to the propagation velocity difference of the ultrasonic waves, and mainly comprises an ultrasonic transducer and a flow sensor.
Preparation of a radioactive isotope logging tracer: preparing a solution containing a radioactive isotope of barium-131 or iodine-131; immersing the porous adsorption microspheres of silicon dioxide or active carbon into the solution, adsorbing the radioactive isotope ions, and drying; adding BaSO 4 Or AgNO 3 Precipitating agent solution, fixing radioactive isotope ions by using a precipitating agent, and drying; and sequentially treating the surface of the carrier by using a resin adhesive, an antistatic agent, a temperature resistant agent and a surfactant, and drying to obtain the radioactive isotope logging tracer.
The selection method of the particle size of the radioactive isotope logging tracer agent comprises the following steps: determining the particle size of a radioactive isotope logging tracer agent according to the porosity data of a stratum of a to-be-logged section, wherein the diameter of the isotope tracer agent is slightly larger than the diameter of an oil reservoir throat, so that the tracer agent is filtered and accumulated on the surface of the stratum of a water absorption layer and is used for measuring a water absorption profile; the maximum detection depth of the gamma instrument is 40cm, and the isotope tracer enters the stratum and cannot be monitored due to the fact that the particle size of the isotope tracer is too small.
Preparation of mixed tracer: the specific gravity of each tracer in the mixed tracers is required to cover the approximate specific gravity of the injection water of the oil field test area block, for example, if the specific gravity of the injection water of the test area block is 1.03g/cm 3 Then the true value of the specific gravity of the injected water of the well-planned logging section should be changed around the value, and the selection of 1.010g/cm can be considered 3 、1.015g/cm 3 、1.020g/cm 3 、 1.025g/cm 3 、1.030g/cm 3 、1.035g/cm 3 、1.040g/cm 3 And 1.045g/cm 3 And (5) adding the tracer with the same weight, and stirring and uniformly mixing to form the mixed tracer to be screened.
Step (1), loading tracer into a bin: the valves 12 and 20 and the porous valves 13 and 15 are unscrewed, the porous valves 17 and 19 are closed, and the mixed tracer is added above the porous valve 17 in the isotope bin 16 of the screening device through a conduit; during the addition process, the friction between the mixed tracer and the catheter can reduce the collision force between the tracer and the porous valve 17;
in order to further reduce the degree of the collision, the valve 20 and the porous valves 17 and 19 can be selectively closed, the valve 12 and the porous valves 13 and 15 are opened, water is injected into the isotope bins 18 and 16, and when the water in the isotope bin 16 approaches the porous valve 15, the water injection is stopped; the mixed tracer is immersed in water in advance and mixed with water, and the mixed tracer mixed with the water is transferred into the isotope bin 16 through a guide pipe; the valve 20 is opened, water is discharged, and the mixed tracer is filtered and reserved above the porous valve 17; all valves are closed.
Step (2), the screening device puts in: releasing the screening device downwards to a downhole planned logging section; the controller 3 respectively controls the pressure measuring unit 4, the temperature measuring unit 5 and the flow rate measuring unit 6 to measure and obtain pressure, temperature and flow rate data of the well to be measured section, underground pressure, temperature and flow rate signals are converted into voltage signals, and the voltage signals are uploaded to the ground data acquisition station through the cable 2. The first valve 12 and the second valve 20 are opened, the injected water of the well to be tested section enters the upper isotope bin 14, the middle isotope bin 16 and the lower isotope bin 18 through the first valve 12, the first porous valve 13, the second porous valve 15, the third porous valve 17, the fourth porous valve 19 and the second valve 20, the isotope tracer in the middle isotope bin 16 is soaked in the injected water, after a period of time, the first valve 12 and the second valve 20 are closed in sequence when the middle isotope bin 16 has the same pressure and temperature as the injected water, and the injected water in the middle isotope bin 16, the upper isotope bin 14 and the lower isotope bin 18 is in a static state at the moment.
And (3) layering a tracer: when the flow of the injected water in the isotope bin 16 is stopped, the radioactive isotope logging tracers with different specific gravities can be layered, the tracer which is smaller than the specific gravity of the injected water floats upwards, the tracer which is larger than the specific gravity of the injected water sinks downwards, and the tracer which is the same as the specific gravity of the injected water suspends. At the moment, the porous valve 15 is opened, and the tracer with small specific gravity floats upwards to enter the isotope bin 14; opening the porous valve 17, and allowing the isotope tracer with high specific gravity to enter an isotope bin 18; after a period of time, the layering is stopped, the porous valves 15 and 17 are closed in sequence, the radioactive isotope logging tracer in the isotope bin 16 is the screened tracer, is in a suspension state and has the specific gravity similar to that of the injected water to be measured, and the isotope tracer which is the closest to that of the injected water at the planned logging section can be obtained by screening through the screening method.
Step (4), sampling of underground injected water of the planned logging section: and opening the third valve 7 and the fourth valve 10, and after the water taking bin 9 is filled with water, closing the third valve 7 and the fourth valve 10 in sequence to finish sampling of the underground injection water of the logging-planned section, analyzing information such as specific gravity, mineralization degree and components of the underground injection water on the ground, and performing layering and fine logging.
Step (3), the screening device provides: after the screening device is lifted out of the wellhead, the radioactive isotope logging tracer in the isotope bin 16 is taken out, and the specific gravity, the breaking rate and the isotope desorption rate of the screened tracer are tested under 1 standard atmospheric pressure on the ground. The specific gravity was measured by a particle specific gravity analyzer method. And (4) screening the screened tracers, weighing, and comparing the obtained breakage rate with the initial tracer addition weight. The desorption rate of the tracer is calculated by measuring the change in radioactivity.
Comprehensive information such as specific gravity, pressure, temperature, flow rate, crushing rate and desorption rate obtained by the screening device and specific gravity, mineralization degree, components and the like of injected water is utilized to optimize the tracer and the injection and monitoring processes of the tracer, so that the requirements of layering and fine logging are met.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. A method for screening a radioactive isotope logging tracer agent underground is characterized by comprising the following steps: the adopted radioactive isotope well logging tracer downhole screening device comprises a device body (1), and a controller (3), a pressure measuring unit (4), a temperature measuring unit (5), a flow rate measuring unit (6), an upper isotope bin (14), a middle isotope bin (16) and a lower isotope bin (18) which are arranged in the device body (1); the upper isotope bin (14), the middle isotope bin (16) and the lower isotope bin (18) are sequentially arranged from top to bottom in the vertical direction, namely the middle isotope bin (16) is positioned between the upper isotope bin (14) and the lower isotope bin (18), and the upper isotope bin (14) is positioned at the upper part of the middle isotope bin (16); the upper isotope bin (14), the middle isotope bin (16) and the lower isotope bin (18) are communicated, and porous valves are arranged at the communication positions of the upper isotope bin, the middle isotope bin and the lower isotope bin; the method specifically comprises the following steps: a second porous valve (15) is arranged between the upper isotope bin (14) and the middle isotope bin (16); a third porous valve (17) is arranged between the middle isotope bin (16) and the lower isotope bin (18); a first porous valve (13) and a first valve (12) are arranged at the upper opening position of the upper isotope bin (14), and the first valve (12) is positioned at the outermost part; a fourth porous valve (19) and a second valve (20) are arranged at the lower opening position of the lower syngen bin (18), and the second valve (20) is positioned at the outermost part; the aperture of the porous valve is smaller than the particle size of the tracer; when the porous valve is opened, liquid and the tracer can freely pass through the porous valve, and when the porous valve is closed, only liquid can pass through the porous valve, but the tracer cannot pass through the porous valve;
the method comprises the following steps:
step (1), loading tracer into a bin: the first valve (12), the second valve (20), the first porous valve (13) and the second porous valve (15) are unscrewed, the third porous valve (17) and the fourth porous valve (19) are closed, and the mixed tracer is added above the third porous valve (17) in the middle isotope bin (16) of the screening device; during the addition, the friction between the mixed tracer and the catheter can reduce the collision force between the tracer and the third porous valve (17);
step (2), the screening device puts in: releasing the screening device to a planned logging section underground, wherein an upper isotope bin (14), a middle isotope bin (16) and a lower isotope bin (18) are sequentially arranged from top to bottom in the vertical direction; opening a first valve (12) and a second valve (20), enabling injected water of a well to be tested section to enter an upper isotope bin (14), a middle isotope bin (16) and a lower isotope bin (18) through the first valve (12), a first porous valve (13), a second porous valve (15), a third porous valve (17), a fourth porous valve (19) and the second valve (20), soaking an isotope tracer in the middle isotope bin (16) in the injected water, and closing the first valve (12) and the second valve (20) in sequence when the middle isotope bin (16) has the same pressure and temperature as the injected water after a period of time, wherein the injected water in the middle isotope bin (16), the upper isotope bin (14) and the lower isotope bin (18) is in a static state at the moment;
and (3) layering a tracer: when the flow of the water injected into the middle isotope bin (16) stops, the second porous valve (15) is opened, and the tracer agent with low specific gravity floats upwards and enters the upper isotope bin (14); opening a third porous valve (17), and enabling the isotope tracer with high specific gravity to enter a lower isotope bin (18); after a period of time, stopping layering, and closing the second porous valve (15) and the third porous valve (17) in sequence, wherein the radioactive isotope logging tracer in the middle isotope bin (16) is the screened tracer;
step (4), the screening device provides: after the screening device is lifted out of the well mouth, the radioactive isotope logging tracer agent in the middle isotope bin (16) is taken out, and the specific gravity, the breaking rate and the isotope desorption rate of the screened tracer agent are tested under 1 standard atmospheric pressure on the ground.
2. A method of downhole screening of radioisotope well-logging tracers as defined in claim 1, wherein: in the step (1), in order to further reduce the degree of the collision, closing a second valve (20), a third porous valve (17) and a fourth porous valve (19), opening a first valve (12), a first porous valve (13) and a second porous valve (15), injecting water into a downward isotope bin (18) and a middle isotope bin (16), and stopping injecting water when the water in the middle isotope bin (16) approaches the second porous valve (15); the mixed tracer is immersed in water in advance and mixed with water, and the mixed tracer mixed with the water is transferred into a middle isotope bin (16) through a guide pipe; opening the second valve (20), the water is discharged, and the mixed tracer is filtered to the upper part of the third porous valve (17); all valves are closed.
3. A method of downhole screening of radioisotope well-logging tracers as defined in claim 1, wherein: in the step (2), the controller (3) respectively controls the pressure measuring unit (4), the temperature measuring unit (5) and the flow rate measuring unit (6) to measure and obtain pressure, temperature and flow rate data of the well to be measured section, underground pressure, temperature and flow rate signals are converted into voltage signals, and the voltage signals are uploaded to the ground data acquisition station through the cable (2).
4. A method of downhole screening of radioisotope well-logging tracers as defined in claim 1, wherein: the method also comprises the step (5) of sampling the underground injected water of the well-logging section: and opening the third valve (7) and the fourth valve (10), closing the third valve (7) and the fourth valve (10) in sequence after the water taking bin (9) is filled with water, completing sampling of the underground injected water of the section to be logged, analyzing specific gravity, mineralization degree and component information of the underground injected water on the ground, and performing layering and fine logging.
5. A method for downhole screening of radioisotope logging tracers as claimed in claim 1, wherein: the mixed tracer in the step (1) comprises radioactive isotope logging tracers with different specific gravities, and the radioactive isotope logging tracers with different specific gravities are uniformly mixed according to the same weight.
6. A method of downhole screening of radioisotope well-logging tracers as defined in claim 1, wherein: in the step (1), the mixed tracer is added above a third porous valve (17) in a middle isotope bin (16) of the screening device through a conduit.
7. The method of downhole screening of radioisotope logging tracers as recited in claim 6, wherein: in the step (1), the conduit is a hollow plastic pipe, the inner diameter of the conduit is far larger than the particle size of the isotope tracer, the outer diameter of the conduit is far smaller than the inner diameter of the opening of the valve, and the wall thickness of the conduit is 1-3 mm.
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| CN1055339C (en) * | 1992-07-15 | 2000-08-09 | 中国核动力研究设计院 | Survey of wells by radioactive isotope tracking method |
| JP3782060B2 (en) * | 2003-01-27 | 2006-06-07 | 飛島建設株式会社 | Tracer manufacturing method and groundwater flow measurement method using tracer |
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| CN104006946B (en) * | 2014-06-10 | 2016-03-30 | 珠江水利委员会珠江水利科学研究院 | The layering tracing method of the salty damp salt fresh water density stratified flow in a kind of river mouth |
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