CN116066084A - Method for detecting leakage through long-acting tracing and monitoring of leakage of sleeve - Google Patents
Method for detecting leakage through long-acting tracing and monitoring of leakage of sleeve Download PDFInfo
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- CN116066084A CN116066084A CN202310098414.1A CN202310098414A CN116066084A CN 116066084 A CN116066084 A CN 116066084A CN 202310098414 A CN202310098414 A CN 202310098414A CN 116066084 A CN116066084 A CN 116066084A
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- 238000012544 monitoring process Methods 0.000 title claims description 16
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- 238000001514 detection method Methods 0.000 claims abstract description 37
- 239000004568 cement Substances 0.000 claims abstract description 30
- 239000003129 oil well Substances 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 14
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- 239000010936 titanium Substances 0.000 claims description 2
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- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- MQNVHUZWFZKETG-UHFFFAOYSA-N P1(OCCCCCO1)=O.NCCNCCN Chemical compound P1(OCCCCCO1)=O.NCCNCCN MQNVHUZWFZKETG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
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Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (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 relates to the technical field of petroleum industry, and discloses a method for detecting leakage by long-acting tracing of casing leakage, which comprises the following steps: when the oil well is completed, the leak detection tracer is added into the well cementation cement paste, and different kinds of leak detection tracer are added into the well cementation cement paste of different layers of the oil well, so that the concentration of the leak detection tracer in the produced liquid of the oil well is detected. When the sleeve is damaged by leakage points, the stratum water breaks through the well cementation cement due to the pressure difference effect, so that the effective components in the leakage detection tracer agent carried in the well cementation cement are released, and the leakage detection tracer agent of the corresponding leakage point layer section can be detected in the produced liquid of the oil well. The invention reduces the working flow, reduces the construction cost and does not affect the normal production of the oil well while improving the leakage finding effect, and recovers the exploitation level of the oil well, thereby achieving the aims of reducing the cost and enhancing the efficiency of the oil field.
Description
Technical Field
The invention relates to the technical field of petroleum industry, in particular to a method for detecting leakage through long-acting tracing of casing leakage.
Background
In the field of petroleum and natural gas exploitation, an oil and gas well mostly penetrates through a plurality of stratum, and in the long-term exploitation process, the wall of a casing pipe of an oil well can be damaged and lost due to the influence of factors such as well cementation quality deterioration, fracturing and corrosion, so that the yield of the oil well is reduced, the water injection pressure is reduced and the like, and the economic benefit of an oil field is seriously influenced. In order to restore the normal exploitation level, the damaged and lost points of the casing are required to be plugged for effective repair.
In the prior art, most of downhole tools are needed, meanwhile, oil wells are needed to be stopped to be matched with leakage finding, and leakage points cannot be monitored and found in real time, so that the occurrence of the leakage condition of a sleeve cannot be found timely, and therefore, a technical process which is simple in leakage finding and can be used for long-term monitoring is needed, and the effects of low cost and real-time leakage monitoring are achieved.
Disclosure of Invention
Aiming at the problems, the invention provides a method for detecting leakage by long-acting tracing and monitoring of casing leakage, which overcomes the limitations of the existing leakage detection technology, reduces the working flow, reduces the construction cost and does not influence the normal production of an oil well while improving the leakage detection effect, and restores the exploitation level of the oil well, thereby achieving the aims of reducing the cost and enhancing the efficiency of an oil field.
The technical scheme for solving the technical problems is as follows:
a method for detecting leakage by long-acting tracing and monitoring of sleeve leakage comprises the following steps: when the oil well is completed, the leak detection tracer is added into the well cementation cement paste, and different kinds of leak detection tracer are added into the well cementation cement paste of different layers of the oil well, so that the concentration of the leak detection tracer in the produced liquid of the oil well is detected. When the sleeve is damaged by leakage points, the stratum water breaks through the well cementation cement due to the pressure difference effect, so that the effective components in the leakage detection tracer agent carried in the well cementation cement are released, and the leakage detection tracer agent of the corresponding leakage point layer section can be detected in the produced liquid of the oil well.
Further, the manufacturing method of the leak detection tracer comprises the following steps: mixing 70% of metal element nitrate, 20% of complexing agent and 10% of dispersing agent according to the weight percentage, adding the mixture into ethanol solution according to the proportion of 1:2, adding citric acid monohydrate with the mass percentage of 2%, stirring the obtained solution for 5 minutes, standing for 5 minutes, and stirring for 3 minutes.
Further, the metal element is the metal element which does not exist in the stratum of the target oil well or has the content of less than 0.1% in a natural system.
Further, the metal element is one or more of scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, zirconium, titanium, cadmium, cobalt, chromium, nickel, cesium, indium, lithium, rubidium, gallium, thallium, germanium, smash, tellurium, rhenium and technetium.
Further, the complexing agent is organic phosphonate, such as ethylenediamine tetramethylene sodium phosphate and diethylenetriamine pentamethylene phosphonate.
Further, the dispersing agent is polynaphthalene formaldehyde sodium sulfonate.
Furthermore, the leak detection tracer is in a slow-release particle form, and the slow-release particles of the leak detection tracer are wrapped by taking the well cementation cement slurry as a framework.
Further, the preparation method of the leak detection tracer in the form of slow release particles comprises the following steps: and (3) preparing the leak detection tracer solution, epoxy resin and a high-temperature toughening curing agent according to a mass ratio of 3:10:2, and then crushing into 30-40 mesh particles.
Further, the mass ratio of the leak detection tracer to the well cementation cement slurry is 1.5% -2%.
Further, the method for adding different kinds of leak detection tracers into the well cementing cement slurry of different layers of the oil well comprises the following steps: the selected different types of leak detection tracers are segmented and evenly injected into a cementing pipeline, so that the leak detection tracers are evenly dispersed in the well cementing slurry.
Further, the leakage detection tracer has an effect of less than 3% on the performance parameters of the conventional well cementation cement slurry system, wherein the performance parameters comprise thickening time and cement stone compressive strength after curing for 7d at 80 ℃.
The effects provided in the summary of the invention are merely effects of embodiments, not all effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the invention solves the limitations of the existing leakage finding and detecting technology, does not influence the normal production of an oil well in the leakage detecting and detecting processes, and can complete the leakage detecting and detecting procedures only by sampling at a wellhead and detecting the concentration of the leakage detecting tracer in a laboratory, thereby achieving the effects of low cost and real-time monitoring. And secondly, a downhole tool and downhole operation are not needed, and the risk of the downhole operation is avoided. In addition, the invention adopts the well cementation cement as the skeleton to wrap the leak detection tracer in the well cementation stage, so that the leak detection tracer forms a slow release effect in the skeleton, and the damage and leakage of the sleeve can be continuously monitored for a long time.
Drawings
FIG. 1 is a schematic diagram of an oil well with casing leakage long-term tracking monitoring and leak finding;
FIG. 2 is a schematic diagram of the well after leak points occur;
in the figure: 1-ground, 2-well wall, 3-oil well casing, 4-perforation, 5-leak detection tracer A, 6-leak detection tracer B, 7-leak detection tracer C, 8-leak detection tracer D and 9-leak points.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
Example 1
In the oil well completion stage, different kinds of leakage detecting tracers are pumped into cementing cement slurry of different layers according to design in cementing pipelines of the cementing cement slurry at constant speed, and the cementing cement slurry is solidified to be used as a framework to uniformly disperse and wrap the leakage detecting tracers in the framework so that the leakage detecting tracers form a slow release effect, as shown in the figure, the leakage detecting tracers A5 are wrapped in the old well cement of the first layer section from bottom to top, the leakage detecting tracers B6 are wrapped in the old well cement of the second layer section, the leakage detecting tracers C7 are wrapped in the old well cement of the third layer section, and the leakage detecting tracers D8 are wrapped in the old well cement of the fourth layer section. In the normal production process, only the leak detection tracer A5 of the interval where the perforation 4 is located is produced, and other intervals are not disturbed due to the fact that the casing is intact, and the concentration of the leak detection tracer is not produced.
As shown in fig. 2, with long-term production of an oil well, the wall of the oil well casing 3 will be damaged and lost, and the oil well casing 3 will have a leak source 9, so that the leak detection tracer B6 contained in the interval where the leak source 9 is located will be produced to the wellhead along with formation water, and thus the effective production of the leak detection tracer B6 will be detected in the oil well produced liquid sample at the wellhead, so that the interval where the casing leak source 9 is located can be judged, and the next effective leak-stopping operation can be performed.
As can be seen from Table 1, the leakage detection tracer of the invention has less than 3% of influence effect on the performance parameters of the existing cementing slurry system in the market, wherein the performance parameters comprise thickening time and compressive strength of cement stones cured for 7 days at 80 ℃.
TABLE 1 influence of leak detection tracer content on cement paste thickening time and set Cement compressive strength at 80℃for 7d
While the foregoing description of the embodiments of the present invention has been presented with reference to the drawings, it is not intended to limit the scope of the invention, but rather, it is apparent that various modifications or variations can be made by those skilled in the art without the need for inventive work on the basis of the technical solutions of the present invention.
Claims (10)
1. A method for detecting leakage by long-acting tracing of casing leakage is characterized in that a leakage detecting tracer is added into well cementing cement paste when well completion is carried out, different kinds of leakage detecting tracer are added into well cementing cement paste of different layers of an oil well, and the concentration of the leakage detecting tracer in produced liquid of the oil well is detected.
2. The method for detecting leakage by long-acting tracing and monitoring of casing leakage according to claim 1, wherein the leakage detecting tracer is in a slow-release particle form, and the slow-release particles of the leakage detecting tracer are wrapped by taking well cementing cement slurry as a framework.
3. The method for detecting leakage by long-acting tracing and monitoring of casing leakage according to claim 2, wherein the method for preparing the leakage detecting tracer in slow-release particle form is characterized by comprising the following steps: and (3) preparing the leak detection tracer solution, epoxy resin and a high-temperature toughening curing agent according to a mass ratio of 3:10:2, and then crushing into 30-40 mesh particles.
4. The method for detecting leakage by long-acting tracing and monitoring of leakage of the sleeve pipe according to claim 1 or 2, wherein the method for manufacturing the leakage detecting tracer is characterized by comprising the following steps: mixing 70% of metal element nitrate, 20% of complexing agent and 10% of dispersing agent according to the weight percentage, adding the mixture into ethanol solution according to the proportion of 1:2, adding citric acid monohydrate with the mass percentage of 2%, stirring the obtained solution for 5 minutes, standing for 5 minutes, and stirring for 3 minutes.
5. The method for detecting and finding leakage through long-acting tracing of casing leakage according to claim 4, wherein the metal element is a metal element which is not present in the stratum of the target oil well or has a content of less than 0.1% in a natural system.
6. The method for long-acting tracking, monitoring and finding leakage of a casing pipe according to claim 4, wherein the metal element is one or more of scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, zirconium, titanium, cadmium, cobalt, chromium, nickel, cesium, indium, lithium, rubidium, gallium, thallium, germanium, smash, tellurium, rhenium and technetium.
7. The method for long-acting tracking and monitoring leakage finding of casing leakage according to claim 4, wherein the complexing agent is organic phosphonate, and the dispersing agent is polynaphthalene formaldehyde sodium sulfonate.
8. The method for detecting leakage by long-acting tracing and monitoring of casing leakage according to claim 1, wherein the mass ratio of the leakage detecting tracer to the well cementing slurry is 1.5% -2%.
9. The method for long-acting tracking and monitoring and leakage finding of casing leakage according to claim 1 or 8, wherein the method for adding different kinds of leakage detecting tracers into the well cementing cement slurries of different intervals of an oil well is as follows: the selected different types of leak detection tracers are segmented and evenly injected into a cementing pipeline, so that the leak detection tracers are evenly dispersed in the well cementing slurry.
10. The method for detecting leakage by long-acting tracing and monitoring of casing leakage according to claim 1 or 8, wherein the effect of the leakage detecting tracer on the performance parameters of the existing well cementation cement slurry system is less than 3%, and the performance parameters comprise thickening time and cement stone compressive strength after curing for 7d at 80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310098414.1A CN116066084A (en) | 2023-02-10 | 2023-02-10 | Method for detecting leakage through long-acting tracing and monitoring of leakage of sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310098414.1A CN116066084A (en) | 2023-02-10 | 2023-02-10 | Method for detecting leakage through long-acting tracing and monitoring of leakage of sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116066084A true CN116066084A (en) | 2023-05-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310098414.1A Pending CN116066084A (en) | 2023-02-10 | 2023-02-10 | Method for detecting leakage through long-acting tracing and monitoring of leakage of sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116066084A (en) |
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2023
- 2023-02-10 CN CN202310098414.1A patent/CN116066084A/en active Pending
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