CN113638722A - Method for testing injection profile of nitrogen injection gas well by using tracing method - Google Patents
Method for testing injection profile of nitrogen injection gas well by using tracing method Download PDFInfo
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- CN113638722A CN113638722A CN202110179911.5A CN202110179911A CN113638722A CN 113638722 A CN113638722 A CN 113638722A CN 202110179911 A CN202110179911 A CN 202110179911A CN 113638722 A CN113638722 A CN 113638722A
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- 238000002347 injection Methods 0.000 title claims abstract description 125
- 239000007924 injection Substances 0.000 title claims abstract description 125
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 239000007789 gas Substances 0.000 title claims abstract description 61
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000010521 absorption reaction Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 238000005259 measurement 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
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000007921 spray 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
- E21B43/168—Injecting a gaseous medium
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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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)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a method for testing an injection section of a nitrogen injection gas well by a tracing method, which comprises the following steps: 1) selecting a radioactive tracer which can be suitable for testing the injection profile of the nitrogen well; 2) the injection profile testing downhole instrument string of the nitrogen-injection gas well is formed by an injection profile seven-parameter downhole instrument and a water absorption profile downhole instrument tested by a tracing method, and the injection profile of the nitrogen-injection gas well is tested by the radioactive tracer which is selected in the step 1) and can be suitable for testing the injection profile of the nitrogen-injection gas well.
Description
Technical Field
The invention belongs to the field of petroleum logging, and relates to a method for testing an injection profile of a nitrogen-injection gas well by a tracing method.
Background
With the development of the oil field nitrogen injection service, the oil field needs to master the injection condition in time, and the task of testing the injection profile of the nitrogen injection gas well is gradually increased, but the existing turbine flow technology cannot meet the oil field requirements, and the limitations mainly include the following aspects:
1. in a well for injecting nitrogen into a separate injection well pipe column, the air input of each layer cannot be tested by the existing technologies such as turbine flow and the like;
2. in the well for injecting nitrogen back to the well pipe column, the prior technologies such as turbine flow and the like cannot record the air inflow of each layer;
3. when the well is injected with nitrogen by a well pipe column, and a turbine flow test is used in the test, because the oil field adopts foam nitrogen gas miscible flooding, the pipe wall is dirty, the turbine is stuck to the outside in different degrees (see figure 1), and the turbine is inflexible or does not rotate, so that the turbine flow curve has poor correlation, low quality and large interpretation error.
The problem of sticking and blocking of the turbine cannot be solved even when the inverted manifold apparatus is tested (see fig. 1). Other non-movable part instruments are tested to measure the injection profile, but many affected factors can only be qualitative and cannot be quantitative, so that a nitrogen injection gas well injection profile testing technology suitable for the existing nitrogen injection gas condition of an oil field is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for testing the injection section of a nitrogen injection gas well by a tracing method, which is suitable for testing the injection section of the nitrogen injection gas well under the existing nitrogen injection condition of an oil field.
In order to achieve the aim, the method for testing the injection section of the nitrogen injection gas well by the tracing method comprises the following steps:
1) selecting a radioactive tracer which can be suitable for testing the injection profile of the nitrogen well;
2) the injection profile testing downhole instrument string of the nitrogen-injection gas well is formed by an injection profile seven-parameter downhole instrument and a water absorption profile downhole instrument tested by a tracing method, and the injection profile of the nitrogen-injection gas well is tested by the radioactive tracer which is selected in the step 1) and can be suitable for testing the injection profile of the nitrogen-injection gas well.
The ground state of the radioactive tracer which can be suitable for the nitrogen well injection profile test is liquid.
The radioactive tracer which can be suitable for nitrogen well injection profile testing is in a gas state in a critical well after being injected under the temperature condition of a well testing well section in the well.
The gas state density of the radioactive tracer which can be suitable for the injection profile test of the nitrogen well after being sprayed under the pressure condition of the logging well section in the well is the same as the nitrogen density in the well.
The gas flow velocity in the nitrogen injection gas well is larger than the water flow velocity of the water injection well.
The diffusion speed of the radioactive tracer in the nitrogen injection well is higher than that of the tracer in the water injection well, and the radioactive tracer is suitable for testing the injection section of the nitrogen well.
The invention has the following beneficial effects:
the method for testing the injection profile of the nitrogen-injection gas well by the tracing method comprises the steps of selecting a radioactive tracer which can be suitable for testing the injection profile of the nitrogen gas well, and testing the injection profile of the nitrogen gas well by using the radioactive tracer which can be suitable for testing the injection profile of the nitrogen gas well through an injection profile testing downhole instrument string of the nitrogen gas well, so that the injection profile test of the nitrogen-injection gas well under the existing nitrogen-injection gas condition of an oil field is realized.
Drawings
FIG. 1 is a turbine sticking diagram;
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;
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the method for testing the injection section of the nitrogen injection gas well by the tracing method comprises the following steps:
1) selecting a radioactive tracer which can be suitable for testing the injection profile of the nitrogen well;
2) the injection profile testing downhole instrument string of the nitrogen-injection gas well is formed by an injection profile seven-parameter downhole instrument and a water absorption profile downhole instrument tested by a tracing method, and the injection profile of the nitrogen-injection gas well is tested by the radioactive tracer which is selected in the step 1) and can be suitable for testing the injection profile of the nitrogen-injection gas well.
The ground state of the radioactive tracer which can be suitable for the nitrogen well injection section test is liquid; the radioactive tracer which can be suitable for the injection profile test of the nitrogen well is in a gas state in a critical well after being sprayed under the temperature condition of a well testing section in the well; the gas state density of the radioactive tracer which can be suitable for the injection profile test of the nitrogen well after being sprayed under the pressure condition of the logging well section in the well is the same as the nitrogen density in the well.
The gas flow velocity in the nitrogen injection gas well is greater than the water flow velocity of the water injection well; the diffusion speed of the radioactive tracer in the nitrogen injection well is higher than that of the tracer in the water injection well, and the radioactive tracer is suitable for testing the injection section of the nitrogen well.
Example one
The specific operation of this embodiment is:
step 101) acquiring a radioactive tracer which can adapt to the injection profile test of the nitrogen-injection gas well.
The radioactive tracer is conveniently configured 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.
Step 102) matching with a downhole instrument string and perfecting a data acquisition process flow.
Downhole tool string: temperature + pressure + magnetism location + liquid releaser + gamma 1+ gamma 2 (optional) + hold water, hold water the instrument and put at the bottom, be convenient for in time discover the liquid level, prevent that the releaser from being blocked up the influence and spray the effect.
On the basis of measuring the injection profile of a water injection well by using a tracer method for many years, a tracking method or a fixed point method is selected according to the gas quantity according to the characteristic that the underground flow rate of a nitrogen injection gas well and the diffusion speed of a tracer are higher than those of the water well, so that the data acquisition process flows of different gas injection modes are perfected.
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, a point distribution test is carried out 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 point distribution principle of the fixed point method tracing flow rate 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, namely a point C, a point D, a point E and a point F, and the point distribution test is carried out in the perforation layer according to the required intervals, and referring 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.
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 F is distributed at the bottom of a perforation section, then points are distributed on the upper and lower parts of each perforation layer respectively, namely a point E, a point D and a point C, and finally the total flow is measured on all layers or in an oil pipe, for example, the points A are distributed and tested according to the required intervals in the perforation layers, and refer 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.
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: it is required to test at G and C points on the upper part of each gas injection nozzle, and finally, to distribute a point a 200m on the measurement section to verify the total flow, refer 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 in the present invention, those skilled in the art can make various substitutions and modifications to some technical features without creative efforts based on the disclosed technical solutions, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (6)
1. A method for testing an injection profile of a nitrogen-injected gas well by a tracing method is characterized by comprising the following steps:
1) selecting a radioactive tracer which can be suitable for testing the injection profile of the nitrogen well;
2) the injection profile testing downhole instrument string of the nitrogen-injection gas well is formed by an injection profile seven-parameter downhole instrument and a water absorption profile downhole instrument tested by a tracing method, and the injection profile of the nitrogen-injection gas well is tested by the radioactive tracer which is selected in the step 1) and can be suitable for testing the injection profile of the nitrogen-injection gas well.
2. The method for testing the injection profile of a nitrogen-injected gas well by the tracer method as recited in claim 1, wherein the surface state of the radioactive tracer which can be used for testing the injection profile of the nitrogen well is a liquid state.
3. The method for testing the injection profile of the nitrogen-injected gas well by the tracing method as claimed in claim 1, wherein the radioactive tracer which can be applied to the injection profile test of the nitrogen well is in a critical well gas state after being injected under the temperature condition of a well testing section in the well.
4. The method for testing the injection profile of the nitrogen-injected gas well by the tracer method as claimed in claim 1, wherein the gas state density of the radioactive tracer which can be suitable for the injection profile test of the nitrogen well after being sprayed under the pressure condition of a logging well section in the well is the same as the nitrogen density in the well.
5. The method for testing the injection profile of the nitrogen-injected gas well by the tracing method as claimed in claim 1, wherein the gas flow rate in the nitrogen-injected gas well is greater than the water flow rate of the water injection well.
6. The method for testing the injection profile of a nitrogen-injected gas well by the tracing method as recited in claim 1, wherein the diffusion rate of the radioactive tracer in the nitrogen-injected gas well, which is suitable for testing the injection profile of the nitrogen well, is greater than the diffusion rate of the tracer in the nitrogen-injected well.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270658A (en) * | 2008-04-30 | 2008-09-24 | 濮阳市东辉钻采技术服务有限公司 | Correlated flux injection section test method and construction technique |
| US20120118564A1 (en) * | 2010-10-19 | 2012-05-17 | Luiz Gomes | Erosion Tracer And Monitoring System And Methodology |
| CN103321636A (en) * | 2013-07-11 | 2013-09-25 | 中国石油天然气股份有限公司 | Non-radioactivity tracing flow well logging method and process based on pulse neutron technology |
| CN108131132A (en) * | 2017-11-27 | 2018-06-08 | 中国石油天然气股份有限公司 | The instrument and method of gas flow under a kind of testing well |
| CN111219184A (en) * | 2020-01-08 | 2020-06-02 | 河南省科学院同位素研究所有限责任公司 | Method for performing injection profile logging on nitrogen injection gas well by utilizing radioactive isotope |
-
2021
- 2021-02-07 CN CN202110179911.5A patent/CN113638722A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270658A (en) * | 2008-04-30 | 2008-09-24 | 濮阳市东辉钻采技术服务有限公司 | Correlated flux injection section test method and construction technique |
| US20120118564A1 (en) * | 2010-10-19 | 2012-05-17 | Luiz Gomes | Erosion Tracer And Monitoring System And Methodology |
| CN103321636A (en) * | 2013-07-11 | 2013-09-25 | 中国石油天然气股份有限公司 | Non-radioactivity tracing flow well logging method and process based on pulse neutron technology |
| CN108131132A (en) * | 2017-11-27 | 2018-06-08 | 中国石油天然气股份有限公司 | The instrument and method of gas flow under a kind of testing well |
| CN111219184A (en) * | 2020-01-08 | 2020-06-02 | 河南省科学院同位素研究所有限责任公司 | Method for performing injection profile logging on nitrogen injection gas well by utilizing radioactive isotope |
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Application publication date: 20211112 |
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