CN111219184A - Method for performing injection profile logging on nitrogen injection gas well by utilizing radioactive isotope - Google Patents
Method for performing injection profile logging on nitrogen injection gas well by utilizing radioactive isotope Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 177
- 239000007924 injection Substances 0.000 title claims abstract description 177
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 239000007789 gas Substances 0.000 title claims abstract description 92
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 85
- 239000000700 radioactive tracer Substances 0.000 claims description 99
- 238000013508 migration Methods 0.000 claims description 25
- 230000005012 migration Effects 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 21
- 239000000523 sample Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 230000005251 gamma ray Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 11
- 230000005484 gravity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000004530 micro-emulsion Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material 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
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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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
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Abstract
The invention provides a method for performing injection profile logging on a nitrogen injection gas well by utilizing radioactive isotopes, which is characterized in that a logging instrument string is configured, the radioactive isotopes are used as tracers to test the injection profile of the nitrogen injection gas well, so that the injection profile testing of the nitrogen injection gas well under the existing nitrogen injection gas condition of an oil field is realized, the operation is convenient and simple, the problem that the injection profile data cannot be recorded by a nitrogen injection gas well turbine adopting a separate injection mode, a reverse injection mode and the like is effectively solved, and the problem that the injection profile of the nitrogen injection gas well cannot be accurately tested due to the fact that the turbine is stuck in the nitrogen injection gas well adopting a forward injection mode is solved.
Description
Technical Field
The invention belongs to the field of petroleum logging, relates to a logging method for an injection profile of a nitrogen injection gas well, and particularly relates to a logging method for an injection profile of a nitrogen injection gas well by using a radioactive isotope tracer.
Background
For a multi-rhythm thick-layer sandstone reservoir and a crack buried hill reservoir developed by water injection, a high-water-seepage channeling channel is easily formed at the bottom of an oil layer at the end of a water well under the influence of the properties of oil products (asphaltene thickened oil and paraffin-based high-condensation oil), the heterogeneity of the oil layer and the gravity separation of oil and water, the water drive spread range is reduced and fixed, the water absorption capacity of an oil layer at the middle upper part is reduced, and residual oil which cannot be used is formed. The nitrogen displacement technology is that nitrogen is injected into water well and oil well, and a new low density displacement medium, such as nitrogen foam, nitrogen microemulsion foam oil, nitrogen non-miscible flooding and other multifunctional slugs, is formed in deep stratum under the cooperation of biochemical surfactant to plug high-permeability pore passage and crack, displace residual oil in middle-low-permeability layer or thick oil layer, and replace residual oil in middle-low-permeability layer and high-position oil layer in gravity mode to raise micro and macro displacement efficiency.
With the gradual popularization and application of the oil field nitrogen injection gas flooding technology, the oil field needs to test the injection profile of the nitrogen injection gas well to grasp the injection condition of nitrogen in time. The existing injection profile testing technology of the nitrogen-injection gas well comprises a noise instrument measurement technology, a heat flow instrument measurement technology, a turbine flow technology and the like, wherein the injection profile is measured by using the noise instrument or the heat flow instrument, only qualitative measurement of injection quantity of each layer can be realized, and quantitative measurement cannot be realized; the limitations of turbine flow testing techniques are mainly expressed in: (1) in the nitrogen injection gas well using a separate injection well pipe column (see figure 3), the existing turbine flow technology cannot test the air input of each layer outside an oil pipe because an instrument runs in the oil pipe; (2) in the nitrogen injection gas well using a reverse injection well string (see figure 3), the existing turbine flow technology cannot test the air input of each layer outside an oil pipe because an instrument passes through the oil pipe and the oil pipe covers all layers; (3) in the nitrogen injection gas well using the positive injection well pipe column, because the oil field adopts foam nitrogen gas miscible flooding and the pipe wall is dirty, when a turbine flow test is adopted, the turbine (including an additionally installed flow inversion type instrument) has sticky cards (shown in figure 1) with different degrees, so that the turbine cannot rotate or rotate, the turbine flow curve correlation is poor (shown in figure 8), the data quality is low, and the measurement error is large.
In summary, the existing nitrogen injection logging technology cannot meet the requirements of oil fields, cannot accurately test the nitrogen injection condition of each injection profile of the nitrogen injection gas well, and is urgently needed to be a nitrogen injection gas well injection profile testing technology suitable for the existing nitrogen injection condition of the oil fields.
Disclosure of Invention
Aiming at the defects and shortcomings of the existing injection profile testing technology of the nitrogen injection gas well, the invention aims to provide a method for performing injection profile logging on the nitrogen injection gas well by utilizing radioactive isotopes, which is convenient and simple to operate, can effectively solve the problem that injection profile data cannot be recorded by a nitrogen injection gas well turbine adopting a separate injection mode, a reverse injection mode and other modes by utilizing the radioactive isotopes as a tracer to test the injection profile of the nitrogen injection gas well under the existing nitrogen injection condition of an oil field, and simultaneously solves the problem that the logging precision is low because the turbine is easily stuck in the nitrogen injection gas well adopting a forward injection mode.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for injection profiling a nitrogen-injected gas well using a radioisotope, the method comprising the steps of:
the method comprises the steps of SS1, configuring a logging instrument string, wherein the logging instrument string is at least provided with a thermometer, a pressure gauge, a magnetic positioning instrument, an isotope tracer releaser, a first gamma probe, a second gamma probe and a water holding rate meter along the height direction of the logging instrument string, wherein the isotope tracer releaser at least comprises a source bin and an ejector, the source bin is used for storing liquid isotope tracer, and the ejector is used for forming gaseous isotope tracer after underground injection; the first gamma probe and the second gamma probe are arranged close to the isotope tracer releaser and have a set distance in the height direction; the water holdup meter is arranged at the lowest end of the logging instrument string;
SS2. selecting a radioactive isotope as a tracer, wherein the radioactive isotope is ensured to be liquid under the conditions of surface temperature and pressure and gaseous under the conditions of temperature and pressure of a well testing section in the well, and when the radioactive isotope is gaseous, the density of the radioactive isotope is at least similar to that of nitrogen injected in the well;
SS3. aspirating a selected radioisotope tracer in liquid form into an isotope tracer releaser of the logging tool string under surface temperature and pressure conditions;
SS4, sucking liquid radioactive isotope tracer into the isotope tracer releaser, moving the logging instrument string downwards along the oil pipe to a to-be-detected nitrogen injection well section, selecting a tracer flow testing mode according to the gas injection form and the gas injection quantity of the to-be-detected nitrogen injection well, and injecting the radioactive isotope tracer at a selected underground measuring point by using an injector of the isotope tracer releaser; monitoring the temperature change of the injected nitrogen in the well by using the thermometer; monitoring the pressure change of the injected nitrogen in the well by using the pressure gauge and analyzing the environmental pressure of the position of the logging instrument string according to the pressure change; measuring the depth of the stratum and the positions of various downhole tools by using the magnetic positioning instrument; measuring the natural gamma ray intensity of the stratum by using the gamma probe to correct the depth of the stratum, tracking the migration and peak value change of the released radioisotope tracer by using the gamma probe, recording the migration speed of nitrogen at different positions, and calculating the air inflow of each injection layer section; and the water holding rate meter is utilized to record the change of the water content of the stratum, so as to judge the fluid property and detect the position of the liquid level, thereby being convenient for finding the liquid level in time and preventing the injector of the isotope tracer releaser from being blocked so as to influence the injection effect.
Preferably, in step SS1, the injection of the injector in the isotope tracer releaser is controlled electronically by controlling the release time of the power supply to control the release amount of the radioisotope.
Further, the injector power supply release time is reduced correspondingly as the nitrogen injection amount increases.
Preferably, in step SS2, the diffusion rate of the radioisotope in the well is adapted for use in a tracking test.
Preferably, in step SS4, the isotope tracer releaser releases the radioisotope tracer such that the movement speed of the released radioisotope tracer is synchronized with the nitrogen speed in the well when the radioisotope tracer is released.
Preferably, in step SS4, the gas injection well type of the nitrogen-injection gas well to be tested includes a co-injection back injection well, a co-injection front injection well and a separate injection well.
Preferably, in step SS4, the tracing flow rate test mode includes a fixed-point tracing flow rate test mode and a tracing flow rate test mode.
Preferably, in step SS4, if the to-be-tested nitrogen-injection gas well is a co-injection back-injection well, when the gas injection amount is too large to track and record the data, a fixed-point tracer flow rate test mode is adopted, the measurement points are arranged one by one according to the sequence from bottom to top, the radioisotope tracer is released point by point, and the gas inflow of each measurement point is tested one by one. When each point is tested, the peak value of the tracing curve is required to be obvious, the peak value migration is required to be obvious, and the tracing test of one measuring point is completed until the peak value does not migrate.
Further, the fixed-point tracing flow test of the co-injection well is specifically carried out according to the following modes: firstly, arranging a measuring point at the bottom of a perforation section, moving the logging instrument string downwards to the measuring point at the bottom, releasing a radioactive isotope tracer at the point by using the isotope tracer releaser, monitoring the migration and peak value change of the released radioactive isotope tracer by using the gamma probe, and measuring the total flow of nitrogen injected into a well; and then, respectively arranging a measuring point on the upper part and the lower part of each perforation layer according to the sequence from bottom to top and the required distance, releasing the radioactive isotope tracer according to the same test mode as the bottom measuring point, monitoring the migration and peak value change of the radioactive isotope tracer, and measuring the air inflow of each perforation layer.
Preferably, in step SS4, if the to-be-measured nitrogen-injected gas well is a co-injection counter-injection well, when the gas injection amount can satisfy the tracking and recording data, a tracking flow rate test mode is adopted, the tracer is released near the bottom of the oil pipe and above the bell mouth, and the tracer is continuously tracked and tested according to the sequence from bottom to top until the tracer completely enters the stratum and disappears, so as to complete the measurement of the gas inflow of each perforation layer.
Furthermore, when a tracking flow test mode is adopted, if the number of perforation sections is large, the perforation sections can be divided into an upper section and a lower section for tracking respectively.
Preferably, in step SS4, if the to-be-tested nitrogen-injected gas well is a co-injection normal injection well, when the gas injection amount is so large that it is too late to trace and record the data, a fixed-point tracer flow rate test mode is adopted, the measurement points are arranged one by one according to the sequence from top to bottom, the radioisotope tracer is released point by point, and the gas inflow of each measurement point is tested one by one. When each point is tested, the peak value of the monitoring curve is required to be obvious, the peak value migration is required to be obvious, and the tracing test of one measuring point is completed until the peak value does not migrate.
Further, a fixed-point tracing flow test of the co-injection positive injection well is specifically performed as follows. Firstly, arranging a measuring point at the top of a perforation section, wherein the measuring point is positioned above all perforation layers or in an oil pipe, moving the logging instrument to the measuring point in a serial-down mode, releasing a radioactive isotope tracer at the point by using an isotope tracer releaser, monitoring the migration and peak value change of the released radioactive isotope tracer by using the gamma probe, and measuring the total flow of nitrogen injected into a well; and then, respectively arranging a measuring point on the upper part and the lower part of each perforation layer according to the sequence from top to bottom and the required distance, releasing the radioactive isotope tracer according to the same test mode as the top measuring point, monitoring the migration and peak value change of the radioactive isotope tracer, and measuring the air inflow of each perforation layer.
Preferably, in step SS4, if the to-be-measured nitrogen-injected gas well is a co-injection positive injection well, when the gas injection amount can satisfy the tracking and recording data, a tracking flow rate test mode is adopted, the tracer is released near the bottom of the oil pipe and above the bell mouth, and the tracer is continuously tracked and tested according to the sequence from top to bottom until the tracer completely enters the stratum and disappears, so as to complete the measurement of the gas inflow of each perforation layer.
Furthermore, when a tracking flow test mode is adopted, if the number of perforation sections is large, the perforation sections can be divided into an upper section and a lower section for tracking respectively.
Preferably, in step SS4, if the to-be-tested nitrogen injection gas well is a separate injection well, a tracking flow rate test mode is adopted, a measurement point is arranged at the upper part of each gas injection nozzle, the tracer is released point by point according to the sequence from bottom to top, and the tracking tracer flow rate test is performed segment by segment. Firstly, releasing a tracer at a measuring point of the bottom gas injection nozzle, then tracking the migration and peak value change of the tracer, requiring that the tracking curve has an obvious peak value and the peak value migration is obvious until the peak value does not migrate, and completing the test of the gas inflow of the bottom gas injection nozzle and the gas inflow of each layer correspondingly matched. After the tracing test of the layer section injected by the bottom gas injection nozzle is finished, the layer section to which each gas injection nozzle belongs is tested upwards successively until all tests are finished.
Furthermore, when the trace flow test is carried out on the injection well, a measuring point is required to be arranged at the upper part of each gas injection nozzle for testing, and finally a measuring point is arranged at a certain position with stable flow above the whole measuring section, so that the tracer is released, and the total flow of the nitrogen injected into the well is measured.
Compared with the prior art, the method for performing injection profile logging on the nitrogen injection gas well by using the radioactive isotope has the advantages that the injection profile of the nitrogen injection gas well is tested by using the radioactive isotope as the tracer through configuring the logging instrument string, so that the injection profile testing of the nitrogen injection gas well under the existing nitrogen injection gas condition of the oil field is realized, the operation is convenient and simple, the problem that the injection profile data cannot be recorded by the nitrogen injection gas well turbine adopting the modes of separate injection, reverse injection and the like can be effectively solved, the problem that the injection profile of the nitrogen injection gas well cannot be accurately tested due to the fact that the turbine is stuck in the nitrogen injection gas well adopting the forward injection mode is solved, and the method is suitable for the injection profile testing of the nitrogen injection gas well under the existing nitrogen injection gas condition of the oil field.
Drawings
FIG. 1 is a schematic view of a turbine sticking card when a turbine flow test is used;
FIG. 2 is a graph of turbine flow versus tracer flow for a Jadon 203 well;
FIG. 3 is a tubular diagram of three gas injection modes of a nitrogen injection gas well;
FIG. 4 is a view of the results of the nitrogen injection profile of a lake 43-13 reverse injection well;
FIG. 5 is a diagram of the results of the injection profile of the Wenxi 1-74 positive injection well for nitrogen injection;
FIG. 6 is a result diagram of the injection section of the nitrogen injection well of the Jadon 2-22 separate injection well;
FIG. 7 is a view of the result of the injection profile of a nitrogen injection well of a Yudong 204-22 injection well;
FIG. 8 is a graph of the results of the shot profile of Yudong 204-19 well.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.
As one embodiment, the method for performing injection profile logging on a nitrogen-injected gas well by using a radioactive isotope according to the invention comprises the following steps:
SS1, configuring a logging instrument string, wherein the logging instrument string sequentially consists of the following instruments from top to bottom: the thermometer + the pressure gauge + the magnetism location instrument + the isotope tracer releaser + first gamma probe + second gamma probe + the water holdup meter. The thermometer is used for monitoring the temperature change of the injected nitrogen in the well. Changes in the pressure of the nitrogen in the well are monitored by a pressure gauge to analyze the properties of the wellbore fluid and the ambient pressure at the location of the instrument. The depth is corrected by a magnetic positioning instrument and a gamma probe, and the depth is used for testing downhole tools such as a casing, an oil pipe joint hoop, a packer, a water nozzle and the like. The gamma probe is used for measuring the natural gamma ray intensity of the stratum to correct the depth of the stratum and measuring the migration and peak value change of the oil isotope after release. The water holdup meter is used for recording water change, judging fluid property and detecting liquid level. The water holding rate meter is arranged at the bottom, so that the liquid level can be found in time, and the releaser is prevented from being blocked to influence the spraying effect. The isotope tracer releaser comprises at least a source compartment for storing the isotope tracer in liquid form and an injector for injecting the isotope tracer in gaseous form.
2. The test process comprises the following steps:
(1) referring to fig. 3, when the gas injection amount is large and the tracking and recording data is not in time, a fixed-point method tracing flow test is adopted, point distribution tests are performed from bottom to top, the requirement that the peak value of a tracing curve is obvious, the peak value migration is obvious is met, and then the next point is tested. The principle of tracing flow distribution points by a fixed point method is that a point B is distributed at the bottom of a perforation section to measure the total flow, then points C, D, E and F are distributed at the upper and lower parts of each perforation layer, the points are distributed and tested in the perforation layers according to the required intervals, and a result chart refers to FIG. 4; when the tracing method is adopted for testing, the tracer is released at the upper part of the bell mouth, and the tracing test is continuously carried out until the tracer completely enters the layer and disappears.
(2) Referring to fig. 3, when the gas injection amount is large or a tracking method cannot be adopted due to well conditions, a fixed point method is adopted for tracing the flow rate test, a point distribution test is performed from top to bottom, the requirement is that the peak value of the curve is obvious, the peak value migration is obvious, and then the next point is tested; the principle of tracing flow distribution points by a fixed point method is that a point B is distributed at the upper part of a perforation section, then points are distributed at the upper part and the lower part of each perforation layer respectively, namely a point C, a point D, a point E and a point F, and finally the total flow is measured on all layers or in an oil pipe, for example, the point A is distributed in the perforation layer according to the required distance for testing, and a result chart refers to a figure 5; when the tracing method is adopted for testing, the tracer is released at the upper part of the bell mouth, and the tracing test is continuously carried out until the tracer completely enters the layer and disappears.
(3) The injection well is shown in figure 3, point distribution testing is carried out on the gas injection nozzle from bottom to top, a tracer agent is released at each point, then the air inflow of each gas nozzle and the air inflow of each layer corresponding to the gas injection nozzle are tested by tracking tracer flow, the peak value of a tracing curve is required to be obvious, the peak value is required to be obvious in migration until the peak value is not migrated, the tracing test of the layer section injected by one gas injection nozzle is completed, and then the layer section to which each water nozzle belongs is tested upwards successively until all tests are completed; the tracing flow distribution principle of the tracking method is as follows: the test is required to be carried out at points G and C on the upper part of each gas injection nozzle, and finally, a point A is distributed at 200m on the measuring section to verify the total flow, and the result chart refers to fig. 6 and 7.
3. And (3) testing by using a tracing test method, releasing the radioactive isotope by supplying power to the releaser underground, tracking the migration process of the radioactive isotope by using a gamma probe, recording the migration speed of nitrogen at different positions, and calculating the air input of each layer.
4. Radioisotope tracer release: sucked in at the surface and released in the well. The power supply is carried out for 2-5 seconds once by spraying, the power supply release time is correspondingly reduced along with the increase of the nitrogen injection amount, and the spraying can be carried out for multiple times.
5. Addition of the radioisotope tracer: when in use, the radioactive isotope is sucked into the source bin of the releaser by the releaser in the source bin, and the releaser is transported by the source box and the ice bag. And releasing power to the releaser in the well.
6. The radioisotope tracer requires: the ground state of the radioactive isotope is liquid, the radioactive isotope is in a critical well gas state after being sprayed under the temperature condition of a well testing section in the well, and the density of the sprayed state under the pressure condition of the well testing section in the well is similar to that of nitrogen in the well. The motion speed of the injected radioactive isotope is synchronous with the nitrogen speed in the well; the diffusion rate of the radioisotope in the well is suitable for use in a tracking test.
More specifically, the method for logging the injection profile of the nitrogen-injected gas well is implemented as follows:
1. a radioisotope is selected as the tracer. The radioactive isotope is conveniently arranged on the ground and enters a conventional liquid releaser, is easy to gasify under the downhole temperature condition, and is in a state close to a gas state after release, and the boiling point is low; the density after downhole release is close to that of nitrogen injection.
Referring to fig. 2, the comparison with the turbine flow experiment is completed, and the turbine data quality of the experiment is better, so the comparison is effective, and the comparison conclusion is as follows: the gravity influence speed is not more than 0.01m/s, the gravity action does not play a main role, and the test result can reflect the flowing condition of the injected gas; the three methods of turbine, fixed point and tracking of No. 1 and No. 2 perforation laminated layers with the length of more than 2772 meters are consistent, and the effectiveness of the tracing method gas injection profile method is shown; the fixed point is basically consistent with the turbine conclusion, and the second perforation layer is shown to be a main injection layer, the injection amount of the first perforation layer and the third perforation layer is not large, the point-added measurement flow in the layers generally conforms to the rule of up and down, and the injection condition can be reflected.
2. On the basis of measuring the injection profile of the water injection well by using a tracing method for many years, a tracing method or a fixed point method is selected according to the characteristic that the underground flow rate and the diffusion speed of the nitrogen injection gas well are higher than those of the water well and the gas quantity, so that the data acquisition process flows of different gas injection modes are perfected.
3. Referring to fig. 3, when the gas injection quantity is large and the tracking and recording information is not in time, a fixed point method tracing flow rate test is adopted, point distribution tests are performed from bottom to top, the requirement is that the curve peak value is obvious, the peak value migration is obvious, and then the next point is tested upwards, the principle of the point method tracing flow rate point distribution is that a point B is distributed at the bottom of a perforation section firstly, the total flow rate is measured, then points are distributed on the upper and lower parts of each perforation layer respectively, namely a point C, a point D, a point E and a point F, the point distribution tests are performed in the perforation layer according to the required intervals, and the result graph refers to fig. 4; when the tracing method is adopted for testing, the tracer is released at the upper part of the bell mouth, and the tracing test is continuously carried out until the tracer completely enters the layer and disappears.
4. Referring to fig. 3, when the gas injection amount is large or a tracking method cannot be adopted due to well conditions, a fixed-point method tracing flow test is adopted, point distribution tests are performed from bottom to top, the requirement is that the curve peak value is obvious, the peak value migration is obvious, and then the next point is tested from top; the principle of tracing flow distribution points by a fixed point method is that a point B is distributed at the bottom of a perforation section, then points C, D, E and F are distributed on the upper and lower parts of each perforation layer, and finally the total flow is measured on all layers or in an oil pipe, for example, the points A are distributed in the perforation layers according to the required intervals for testing, and a result chart refers to FIG. 5; when the tracing method is adopted for testing, the tracer is released at the upper part of the bell mouth, and the tracing test is continuously carried out until the tracer completely enters the layer and disappears.
5. The injection well is shown in figure 3, point distribution testing is carried out on the gas injection nozzle from bottom to top, a tracer agent is released at each point, then the air inflow of each gas nozzle and the air inflow of each layer corresponding to the gas injection nozzle are tested by tracking tracer flow, the peak value of a tracing curve is required to be obvious, the peak value is required to be obvious in migration until the peak value is not migrated, the tracing test of the layer section injected by one gas injection nozzle is completed, and then the layer section to which each water nozzle belongs is tested upwards successively until all tests are completed; the tracing flow distribution principle of the tracking method is as follows: the test is required to be carried out at points G and C on the upper part of each gas injection nozzle, and finally, a point A is distributed at 200m on the measuring section to verify the total flow, and the result chart refers to fig. 6 and 7.
The abnormal point and the total flow are verified, the data quality reaches the standard, and the statistics of the well time data reaching the standard are shown in the table 1.
TABLE 1
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed, those skilled in the art can make various substitutions and modifications on some technical features without creative efforts, and these substitutions and modifications are within the protection scope of the present invention.
Claims (10)
1. A method for injection profiling a nitrogen-injected gas well using a radioisotope, the method comprising the steps of:
the method comprises the steps of SS1, configuring a logging instrument string, wherein the logging instrument string is at least provided with a thermometer, a pressure gauge, a magnetic positioning instrument, an isotope tracer releaser, a first gamma probe, a second gamma probe and a water holding rate meter along the height direction of the logging instrument string, wherein the isotope tracer releaser at least comprises a source bin and an ejector, the source bin is used for storing liquid isotope tracer, and the ejector is used for forming gaseous isotope tracer after underground injection; the first gamma probe and the second gamma probe are arranged close to the isotope tracer releaser and have a set distance in the height direction; the water holdup meter is arranged at the lowest end of the logging instrument string;
SS2. selecting a radioactive isotope as a tracer, wherein the radioactive isotope is ensured to be liquid under the conditions of surface temperature and pressure and gaseous under the conditions of temperature and pressure of a well testing section in the well, and when the radioactive isotope is gaseous, the density of the radioactive isotope is at least similar to that of nitrogen injected in the well;
SS3. aspirating a selected radioisotope tracer in liquid form into an isotope tracer releaser of the logging tool string under surface temperature and pressure conditions;
SS4, sucking liquid radioactive isotope tracer into the isotope tracer releaser, moving the logging instrument string downwards along the oil pipe to a to-be-detected nitrogen injection well section, selecting a tracer flow testing mode according to the gas injection form and the gas injection quantity of the to-be-detected nitrogen injection well, and injecting the radioactive isotope tracer at a selected underground measuring point by using an injector of the isotope tracer releaser; monitoring the temperature change of the injected nitrogen in the well by using the thermometer; monitoring the pressure change of the injected nitrogen in the well by using the pressure gauge and analyzing the environmental pressure of the position of the logging instrument string according to the pressure change; measuring the depth of the stratum and the positions of various downhole tools by using the magnetic positioning instrument; measuring the natural gamma ray intensity of the stratum by using the gamma probe to correct the depth of the stratum, tracking the migration and peak value change of the released radioisotope tracer by using the gamma probe, recording the migration speed of nitrogen at different positions, and calculating the air inflow of each injection layer section; and recording the change of the water content of the stratum by using the water holdup meter, and judging the fluid property and detecting the liquid level position according to the change of the water holdup meter.
2. The method according to the previous claim, wherein in step SS1, the injection of the injector in the isotope tracer releaser is controlled electronically by controlling the release time of the power supply to control the amount of the radioisotope released.
3. Method according to the preceding claim, characterised in that the injector power supply release time is reduced correspondingly as the nitrogen injection quantity increases.
4. The method of the preceding claim, wherein in step SS2, the diffusion rate of the selected radioisotope in the well is adapted for use in a trace test.
5. The method of the preceding claim, wherein in step SS4, the isotope tracer releaser releases the radioisotope tracer at a rate synchronized with the nitrogen rate in the well when the radioisotope tracer is released.
6. The method as claimed in the preceding claim, wherein in step SS4, the gas injection well type of the nitrogen-injection gas well to be tested comprises a co-injection back injection well, a co-injection front injection well and a split injection well.
7. The method of the preceding claim, wherein in step SS4, the tracer flow test regime comprises a site-specific tracer flow test regime and a trace flow test regime.
8. The method as claimed in the preceding claim, wherein in step SS4, if the nitrogen-injected well to be tested is a co-injection back-injection well, when the injected gas amount is too large to be tracked and recorded, a fixed-point tracer flow test mode is adopted, the measurement points are arranged one by one in the order from bottom to top, the radioactive isotope tracer is released one by one, and the gas inflow of each measurement point is tested one by one. When each point is tested, the peak value of the tracing curve is required to be obvious, the peak value migration is required to be obvious, and the tracing flow test of one measuring point is completed until the peak value does not migrate.
9. The method according to the preceding claim, characterized in that the fixed-point trace flow test of the co-injection-shot well is carried out in particular as follows: firstly, arranging a measuring point at the bottom of a perforation section, moving the logging instrument string downwards to the measuring point at the bottom, releasing a radioactive isotope tracer at the point by using the isotope tracer releaser, monitoring the migration and peak value change of the released radioactive isotope tracer by using the gamma probe, and measuring the total flow of nitrogen injected into a well; and then, respectively arranging a measuring point on the upper part and the lower part of each perforation layer according to the sequence from bottom to top and the required distance, releasing the radioactive isotope tracer according to the same test mode as the bottom measuring point, monitoring the migration and peak value change of the radioactive isotope tracer, and measuring the air inflow of each perforation layer.
10. The method as claimed in the preceding claim, wherein in step SS4, if the nitrogen-injecting well to be tested is a co-injection back-injection well, when the injected gas quantity can meet the tracing and recording data, a tracing flow test mode is adopted to release the radioactive isotope tracer near the bottom of the oil pipe and above the bell mouth, and the migration of the radioactive isotope tracer is continuously traced and tested by using a gamma probe according to the sequence from bottom to top until the radioactive isotope tracer completely enters the stratum and disappears, so as to complete the measurement of the air input quantity of each perforation stratum.
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