CN112798196B - Method and device for monitoring leakage of underground gas storage - Google Patents
Method and device for monitoring leakage of underground gas storage Download PDFInfo
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- CN112798196B CN112798196B CN201911111854.6A CN201911111854A CN112798196B CN 112798196 B CN112798196 B CN 112798196B CN 201911111854 A CN201911111854 A CN 201911111854A CN 112798196 B CN112798196 B CN 112798196B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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Abstract
The application discloses a method and a device for monitoring leakage of an underground gas storage, and belongs to the field of natural gas gathering and transportation. The method comprises the following steps: analyzing the natural gas in the underground gas storage to obtain a first analysis result; selecting a tracer according to the first analysis result; injecting the tracer into the underground gas reservoir; analyzing the natural gas injected into the underground gas reservoir of the tracer after the reference time to obtain a second analysis result; comparing the second analysis result with the first analysis result to obtain a comparison result; and judging whether the underground gas storage is leaked or not according to the comparison result. The monitoring efficiency is improved, the monitoring cost is reduced, and the normal gas injection and production operation cannot be influenced.
Description
Technical Field
The application relates to the field of natural gas gathering and transportation, in particular to a method and a device for monitoring leakage of a salt cavern gas storage.
Background
The underground gas storage comprises a plurality of salt cavities buried underground deeply, natural gas is stored in the salt cavities, the salt cavities are communicated with the ground through production sleeves, in order to guarantee the safety of the production sleeves, one layer of technical sleeves can be wrapped outside the production sleeves, and an annular space is formed between the production sleeves and the technical sleeves. Due to the complexity and unpredictability of the geological conditions, there is a risk of leakage around the salt cavity, at the junction of the salt cavity and the production casing, both the production casing and the technical casing during the production run. Therefore, it is necessary to monitor the leakage of the underground gas storage and to find the leakage point of the underground gas storage in time, so that remedial measures can be taken more quickly when the leakage of the underground gas storage occurs, and the loss can be minimized.
In the related technology, an underground instrument is adopted, and a method for measuring geophysical parameters such as the conductive property, the acoustic property, the radioactivity, the electrochemical property and the like of a rock stratum along a drilling profile is adopted to judge whether a sleeve connected with an underground gas storage is leaked or not and further judge whether the underground gas storage is leaked or not.
The inventors found that the related art has at least the following problems:
the underground instrument is adopted to monitor whether the underground gas storage is leaked or not, the underground operation is needed, the cost is high, and whether the salt cavity of the underground gas storage is leaked or not can not be accurately judged.
Content of application
The embodiment of the application provides a method and a device for monitoring leakage of a salt cavern gas storage, and the problems that in the related technology, an underground instrument is adopted to monitor whether the underground gas storage leaks, underground operation is needed, the cost is high, and whether the salt cavity of the underground gas storage leaks cannot be accurately judged are solved. The technical scheme is as follows:
in one aspect, there is provided a method of monitoring a subterranean gas storage reservoir for leaks, the method comprising:
analyzing the natural gas in the underground gas storage to obtain a first analysis result;
selecting a tracer according to the first analysis result;
injecting the tracer into the underground reservoir;
analyzing the natural gas injected into the underground gas reservoir of the tracer after the reference time to obtain a second analysis result;
comparing the second analysis result with the first analysis result to obtain a comparison result;
and judging whether the underground gas storage is leaked or not according to the comparison result.
Optionally, the underground gas storage comprises a plurality of salt cavities buried underground, a production casing connected with each salt cavity, and a technical casing sleeved outside the production casing, wherein an annulus is formed between the production casing and the technical casing, and one ends of the production casing and the technical casing extend to the ground;
the analyzing the natural gas in the underground gas storage to obtain a first analysis result comprises the following steps:
analyzing the production casing of one salt cavity and the natural gas in the annulus to obtain a first analytical sub-result;
analyzing the natural gas in the production casing and the annular space of the salt cavities adjacent to the salt cavities to obtain a second analysis sub-result;
obtaining a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis sub-result;
taking the first, second and third analysis sub-results as the first analysis result.
Optionally, the selecting a tracer according to the first analysis result includes: and selecting a tracer according to the first, second and third analysis sub-results.
Optionally, analyzing the natural gas injected into the underground gas reservoir of the tracer after the reference time has elapsed to obtain a second analysis result, including:
analyzing the production casing of the salt cavity and the natural gas in the annulus to obtain a first analysis value;
analyzing the natural gas in the production casing and the annular space of the salt cavities adjacent to the salt cavities to obtain a second analysis value;
acquiring a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis value;
taking the first analysis value, the second analysis value, and the third analysis value as the second analysis result.
Optionally, comparing the second analysis result with the first analysis result to obtain a comparison result, including:
comparing the first analysis sub-result with the first analysis value to obtain a first comparison result;
comparing the second analysis sub-result with the second analysis value to obtain a second comparison result;
comparing the third analysis sub-result with the second analysis value to obtain a third comparison result;
and taking at least one of the first comparison result, the second comparison result and the third comparison result as the comparison result.
Optionally, the determining whether the underground gas storage is leaked according to the comparison result includes:
and when any one of the first comparison result, the second comparison result and the third comparison result contains the tracer, judging that the underground gas storage is leaked.
Optionally, said injecting said tracer into said subterranean reservoir comprises: the mass ratio of the tracer injected into the underground gas storage to the natural gas in the underground gas storage is 1-1.5.
Optionally, the method further comprises: judging the leakage degree of the underground gas storage according to the values of the first comparison result, the second comparison result and/or the third comparison result;
the greater the extent of leak from the subterranean reservoir when any of the first, second, and third comparison results contains the greater the amount of tracer.
In another aspect, there is provided an apparatus for monitoring underground gas storage for leaks, the apparatus comprising:
the first analysis unit is used for analyzing the natural gas in the underground gas storage to obtain a first analysis result;
a selecting unit for selecting a tracer according to the first analysis result;
an injection unit for injecting the tracer into the underground gas reservoir;
the second analysis unit is used for analyzing the natural gas injected into the underground gas reservoir of the tracer within the reference time to obtain a second analysis result;
the comparison unit is used for comparing the second analysis result with the first analysis result to obtain a comparison result;
and the judging unit is used for judging whether the underground gas storage is leaked or not according to the comparison result.
Optionally, the underground gas storage comprises a plurality of salt cavities buried underground, a production casing connected with each salt cavity, and a technical casing sleeved outside the production casing, wherein an annulus is formed between the production casing and the technical casing, and one ends of the production casing and the technical casing extend to the ground;
the first analysis unit comprises:
the first acquisition unit is used for analyzing the natural gas in the production casing and the annulus of one salt cavity to obtain a first analysis sub-result;
the second acquisition unit is used for analyzing the natural gas in the production casings and the annular spaces of the salt cavities adjacent to the salt cavities to obtain a second analysis sub-result;
the third acquisition unit is used for acquiring a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis sub-result;
a fourth obtaining unit, configured to use the first, second, and third analysis sub-results as the first analysis result.
Optionally, the selecting unit is configured to select the tracer according to the first, second and third analysis result.
Optionally, the second analysis unit is configured to analyze the production casing of the salt cavity and the natural gas in the annulus to obtain a first analysis value;
analyzing the natural gas in the production casings and the annuluses of the salt cavities adjacent to the salt cavities to obtain a second analysis value;
obtaining a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis value;
taking the first analysis value, the second analysis value, and the third analysis value as the second analysis result.
Optionally, the comparing unit is configured to compare the first analysis sub-result with the first analysis value to obtain the first comparison result;
comparing the second analysis sub-result with the second analysis value to obtain a second comparison result;
comparing the third analysis sub-result with the second analysis value to obtain a third comparison result;
taking at least one of the first comparison result, the second comparison result and the third comparison result as the comparison result.
Optionally, the determining unit is configured to determine that the underground gas storage is leaked when any one of the first comparison result, the second comparison result and the third comparison result contains the tracer.
Optionally, the injection unit is used for injecting the tracer into the underground gas storage with the mass ratio of the tracer to the natural gas in the underground gas storage being 1-1.5.
Optionally, the apparatus further comprises: the judging subunit is used for judging the leakage degree of the underground gas storage according to the values of the first comparison result, the second comparison result and/or the third comparison result;
the greater the extent to which the subterranean reservoir leaks when any of the first, second and third comparison results contains the greater the amount of the tracer.
The beneficial effects that technical scheme that this application embodiment brought include at least:
through analyzing the natural gas in the underground gas storage, because the tracer is not injected into the underground gas storage at this moment, therefore, can obtain before not injecting the tracer, the composition of underground gas storage and its peripheral gas, and then make the composition of the tracer of choosing have the difference with the composition of this underground gas storage and its peripheral gas to guarantee that the tracer can better play a role. Injecting a tracer and natural gas into the underground gas storage, wherein after reference time, the tracer can be diffused in the natural gas, analyzing the natural gas in the underground gas storage in which the tracer is injected to obtain a second analysis result, comparing the second analysis result with the first analysis result, and when a difference exists between the first analysis result and the second analysis result, indicating that the natural gas injected into the underground gas storage leaks, wherein at the moment, the content of the tracer can also be reduced. Therefore, whether the natural gas leaks or not can be further judged by the comparison result between the first analysis result and the second analysis result. Through the method that this application provided, monitor from the angle of difference in to underground gas storage storehouse, the monitoring precision is high, and because the tracer of choosing is pollution-free to the environment, for adopting special instrument in the correlation technique in the pit to monitor, improved monitoring efficiency, reduced the cost of monitoring, and can not exert an influence to normal notes gas production operation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for monitoring salt cavern gas storage leakage provided by an embodiment of the application;
FIG. 2 is a schematic representation of the results of a salt cavity-wellbore system in a subterranean reservoir provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of the distribution of natural gas sampling points and possible gas leakage directions provided by an embodiment of the present application;
FIG. 4 is a graph showing the results of the apparatus for monitoring salt cavern gas storage leakage provided by the embodiment of the application.
The reference numerals denote:
1-a wellhead valve; 2-producing the sleeve; 3-annulus; 4-technical casing; 5-a wellbore; 6-salt cavity; 7-earth surface; 8-top surface of salt cavity layer; 101-a wellhead sampling point of the salt cavity production casing; 102-injecting a tracer into a wellhead sampling point of a production casing of a salt cavity; 103-salt cavity annulus wellhead sampling points; 104-injecting a tracer into a sampling point at the wellhead of the salt cavity annulus; 105-surface sample points; 106-fault; 107-possible leakage direction of gas inside the production casing; 108-possible leakage direction of gas in the salt cavity; 109-a first salt compartment; 110-a second salt chamber adjacent to the first salt chamber; 401-a first analysis unit; 402-a selection unit; 403-an injection unit; 404-a second analysis unit; 405-a comparison unit; 406-judging unit.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art.
To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.
The underground gas storage has irreplaceable effects on adjusting the consumption of natural gas and guaranteeing the safety of gas supply, and the construction of the underground gas storage is emphasized by many countries. The research and construction of the underground gas storage in China are still in the starting stage, and the currently built underground gas storage has pioneering property in the aspects of ground process, construction technology and the like, but a dynamic monitoring technology and a sealing evaluation system of a system are not formed in the injection and production process of the underground gas storage due to short running time.
Due to the complexity and the unpredictability of geological conditions, the salt rock cover, the production casing in a well and the technical casing of the underground gas storage are all in leakage risks in the production and operation process, so that the monitoring of the leakage condition of the underground gas storage is one of the most important works in the injection and production operation of the underground gas storage, the service life and the investment recovery period of the underground gas storage are related, the personal and property safety is related, and measures can be taken to reduce the loss to the minimum more quickly when the leakage point or the leakage phenomenon of the underground gas storage is found in time.
At present, a geophysical logging technology is adopted, namely a special underground instrument can be adopted to judge whether a production casing connected with a salt cavern leaks or not, but underground operation is required, so that the cost is high, and whether a salt cavity buried deeply leaks or not cannot be judged. In view of this, the embodiment of the present application provides a method for monitoring leakage of an underground gas storage, and the scheme is as follows:
a method of monitoring a subterranean gas storage reservoir for leaks, the method comprising, with reference to fig. 1:
step 201, analyzing natural gas in an underground gas storage to obtain a first analysis result;
step 202, selecting a tracer according to a first analysis result;
step 203, injecting a tracer into the underground gas storage;
step 204, analyzing the natural gas in the underground gas reservoir injected with the tracer after the reference time to obtain a second analysis result;
step 205, comparing the second analysis result with the first analysis result to obtain a comparison result;
and step 206, judging whether the underground gas storage is leaked or not according to the comparison result.
Through analyzing the natural gas in the underground gas storage, because the underground gas storage does not inject the tracer this moment into, consequently, can obtain before not injecting the tracer, the composition of underground gas storage and its peripheral gas, and then make the composition of the tracer of choosing have the difference with this underground gas storage and its peripheral gas's composition to guarantee that the tracer can better play a role. And injecting a tracer and natural gas into the underground gas storage, after a reference time, the tracer can be diffused in the natural gas, analyzing the natural gas in the underground gas storage into which the tracer is injected to obtain a second analysis result, comparing the second analysis result with the first analysis result, and when a difference exists between the first analysis result and the second analysis result, indicating that the natural gas injected into the underground gas storage is leaked, wherein the content of the tracer is reduced accordingly. Therefore, whether the natural gas leaks or not can be further judged by the comparison result between the first analysis result and the second analysis result. Through the method that this application provided, monitor from the angle of difference in to the underground gas storage, the monitoring precision is high, and because the tracer of selecting is pollution-free to the environment, for adopting special instrument in the pit to monitor among the correlation technique, has improved monitoring efficiency, has reduced the cost of monitoring, and can not exert an influence to normal notes gas production operation.
Step 201, analyzing natural gas in the underground gas storage to obtain a first analysis result.
Optionally, step 201 comprises: step 2011, step 2012 and step 2013.
It should be noted that the underground gas storage comprises a plurality of salt cavities buried underground, and referring to fig. 2, each salt cavity 6 extends to the ground surface 7 through the production casing 2 to form a wellhead, and natural gas, tracer and the like are injected into the salt cavities 6 through the wellhead. In production, a circle of technical casing 4 is generally sleeved outside the production casing 2, and the technical casing 4 can protect the production casing 2 from being damaged and can also ensure the temperature of natural gas in the production casing 2. The position where the production casing 2 is connected with the salt cavity 6 is called a borehole 5, the salt cavity layer top surface 8 is arranged above the borehole, the part of the production casing 2 extending to the ground is called a wellhead, and a wellhead valve 1 is arranged at the wellhead to control the natural gas in the salt cavity 6 to be taken and placed. A gap is left between the production casing 2 and the technical casing 4, forming an annulus 3.
It can be understood that, since the present application monitors whether the underground gas storage reservoir is leaked by adding the tracer, and the substance to be observed and studied needs to be distinguished based on the nature of the tracer, it is necessary to analyze the selected salt cavity and the gas around the salt cavity, and to avoid that the similarity between the selected tracer component and the gas around the underground gas storage reservoir is too high to compare, thereby causing observation and study failure.
And 2011, acquiring a production casing of one salt cavity and analyzing the natural gas in the annulus to obtain a first analysis sub-result.
Because there are many places in the underground gas storage where leakage is easy to occur, for example, leakage can occur around the salt cavity, leakage can occur at the well position, leakage can occur around the production casing, leakage can occur around the technical casing, and the like. Therefore, the content of the natural gas is analyzed by obtaining the natural gas from different places.
In the illustrated embodiment, the natural gas in the production casing and annulus of a salt cavity in a subterranean reservoir is obtained and analyzed for the majority of the natural gas content therein, without injecting a tracer into the salt cavity. It will be appreciated that when natural gas leaks, the natural gas obtained from the location may contain other gases and therefore the content of the natural gas needs to be analysed.
Step 2012, the natural gas in the production casing and the annulus of the salt cavities adjacent to the salt cavity is obtained and analyzed to obtain a second sub-analysis result.
It will be appreciated that when a salt cavity buried deep in the ground leaks, natural gas will diffuse in the ground, so that the production casing and the natural gas in the annulus of selected salt cavities adjacent to the salt cavity can be obtained for analysis without injecting tracer into the salt cavity, resulting in a second sub-analysis.
It should be noted that the number of the multiple salt cavities adjacent to the salt cavity is not limited in this application, and the natural gas in the production casing and the annular space of the multiple salt cavities may be obtained for analysis according to the size of the natural gas diffusion range.
And 2013, obtaining the soil sample which is centered on the salt cavity and within the reference range, and analyzing the soil sample to obtain a third analysis sub-result.
It will be appreciated that when natural gas leaks, the natural gas leaks from the salt cavity buried underground and diffuses around the leaking salt cavity and into the surrounding soil. Thus, before injecting the tracer into the salt cavity, a third sub-result is obtained by obtaining a soil sample within a reference range centered on the selected salt cavity and analyzing the soil sample.
As an example, the reference range provided by the embodiments of the present application may be a soil sample within a diameter range of 1-10 meters centered on the selected salt cavity, resulting in a third sub-analysis result.
Step 202, selecting a tracer according to the first analysis result.
And judging the selected approximate components of the salt cavity and the gas around the salt cavity by combining the first, second and third analysis sub-results obtained in the steps, and further selecting the tracer with a larger composition difference with the gas component.
Optionally, step 202 comprises: and selecting a tracer according to the first analysis sub result, the second analysis sub result and the third analysis sub result.
As an example, when the tracer is selected in the embodiment of the present application, the composition of the tracer can be greatly different from the obtained first, second, and third analysis sub-results, and the tracer selected by the analysis sub-results has stable properties, is easy to monitor, has high sensitivity, is safe and non-toxic, and has little environmental pollution. The selected tracer has low cost and small dosage, and does not produce quality influence on natural gas.
Step 203, injecting a tracer into the underground gas storage.
Optionally, injecting a tracer into the underground reservoir, comprising: the mass ratio of the tracer injected into the underground gas storage to the natural gas in the underground gas storage is 1-1.5.
And selecting the content of the injected tracer according to the size of the salt cavity, and injecting the tracer and natural gas into the salt cavity together. So that the content of the tracer in the gas in the underground gas storage reaches 1.0 ml/cubic meter.
And step 204, analyzing the natural gas in the underground gas reservoir injected with the tracer after the reference time, and obtaining a second analysis result.
After injecting natural gas and tracer into the salt cavity, analyzing the natural gas in the underground gas reservoir of the injected tracer after a reference time. It will be appreciated that when a leak occurs in the salt cavity, that is to say when a leak occurs in the salt cavity or when a leak occurs in the wellbore or when a leak occurs in the production casing, by analysing the natural gas in the underground reservoir into which the tracer is injected, it can be found that the content of the tracer is reduced, from which it can be inferred that a leak has occurred in the salt cavity, and thus remedial action can be taken in time to reduce losses.
It should be noted that the tracer is required to diffuse in the gas in the underground gas storage, and if the gas in the underground gas storage leaks, a certain time is required to monitor whether the tracer leaks. Therefore, the reference time provided in the embodiment of the present invention may be 30 to 35 days, and may be, for example, 30 days, 31 days, 32 days, 33 days, 34 days, 35 days, or the like.
Optionally, step 204 includes step 2041, step 2042 and step 2043.
Step 2041, analyzing the production casing of the salt cavity and the natural gas in the annulus to obtain a first analysis value.
As mentioned above, the leakage of the salt cavity includes the leakage of the production casing of the salt cavity, and when the production casing leaks, the annulus between the production casing and the technical casing may have leaked natural gas and be mixed with the injected tracer. Thus, the analysis of the natural gas in the production casing and annulus of the salt cavity is performed to obtain a first analysis value. Whether natural gas leakage occurs at the production casing in the single salt cavity can be judged through the first analysis value.
Step 2042, analyzing the natural gas in the production casing and the annular space of the salt cavities adjacent to the salt cavities to obtain a second analysis value.
When other salt cavities in the underground gas storage need to be further detected to be leaked, the production sleeves of a plurality of salt cavities adjacent to the salt cavities and the natural gas in the annular space need to be analyzed, and whether the salt cavities are leaked is judged according to the obtained second analysis value.
2043, analyzing the soil sample within the reference range by taking the salt cavity as the center to obtain a third analysis value.
It can be understood that when the salt cavity leaks, the natural gas leaks from the salt cavity buried underground, and diffuses around the leaked salt cavity to enter the surrounding soil. Therefore, a third analysis value is obtained by obtaining a soil sample within a reference range centered on the selected salt cavity and analyzing the soil sample.
And step 205, comparing the second analysis result with the first analysis result to obtain a comparison result.
As will be appreciated, the first analysis result is a result obtained by analysis before the tracer is not injected, and the second analysis result is a result obtained after the tracer is injected and a period of time has elapsed. After a period of time, if the natural gas in the salt cavity leaks, comparing the first analysis result with the second analysis result to obtain a comparison result, and judging whether the natural gas leaks or not according to the comparison result.
Optionally, step 205, includes: step 2051, step 2052, step 2053, and step 2054.
Step 2051, the first analysis sub-result is compared with the first analysis value to obtain a first comparison result.
It will be appreciated that the first analytical sub-result and the first analytical value are both analysed at the same location, i.e. both from the production casing of the salt cavity and from the natural gas in the annulus. If the production casing of the salt cavity leaks from the natural gas in the annulus, a distinction will be made between the second analysis value and the first analysis result, which will yield the first comparison result after comparison. And whether the natural gas in the production casing of the salt cavity and the annular space leaks or not can be judged through the first comparison result.
And step 2052, comparing the second analysis sub-result with the second analysis value to obtain a second comparison result.
It will be appreciated that the second analytical sub-result and the second analytical value are both analysed at the same location, i.e. both for the natural gas in the production casing and annulus of the plurality of salt chambers adjacent to the salt chamber. If the production casing of a plurality of salt cavities adjacent to the salt cavity leaks from the natural gas in the annulus, the second analytical sub-result is distinguished from the second analytical value, and a second comparison result is obtained after comparison. And judging whether the natural gas in the production casing and the annular space of the salt cavities adjacent to the salt cavities leaks or not through the second comparison result.
And step 2053, comparing the third analysis sub-result with the second analysis value to obtain a third comparison result.
It will be appreciated that the third analysis sub-result and the second analysis value are obtained by analysis at the same location, i.e. both results from analysis of a soil sample for a soil sample within a reference range centered on the salt cavity. If leakage occurs with the natural gas in the salt cavity, a third analytical sub-result is distinguished from the second analytical value, and a third comparison result is obtained after comparison. And whether the natural gas in the salt cavity leaks can be judged according to the third comparison result.
And step 2054, taking at least one of the first comparison result, the second comparison result and the third comparison result as a comparison result.
When it needs to be explained, the method provided in the embodiment of the present application may further determine whether the natural gas leaks by using at least one of the first comparison result, the second comparison result, and the third comparison result as the comparison result. The first comparison result, the second comparison result and the third comparison result may also be combined, that is, whether the natural gas leaks or not may be determined according to the first comparison result, the second comparison result and the third comparison result.
And step 206, judging whether the underground gas storage is leaked or not according to the comparison result.
Optionally, the determining whether the underground gas storage is leaked according to the comparison result includes:
and judging that the underground gas storage is leaked when the first analysis sub result is greater than the first analysis value, the second analysis sub result is greater than the second analysis value and/or the third analysis sub result is greater than the second analysis value.
Optionally, the method further comprises: and judging the leakage degree of the underground gas storage according to the values of the first comparison result, the second comparison result and/or the third comparison result.
The greater the value of the first comparison result, the second comparison result, and/or the third comparison result, the greater the extent of leakage from the underground reservoir.
When the comparison result shows a difference value, the content of the tracer is reduced, the tracer leaks along with the leaked natural gas, and at the moment, the natural gas can be judged to leak.
In the example, when the difference of the comparison results is that the monitored content of the tracer exceeds 1.0 nanoliter/cubic meter, the underground gas storage is indicated to have string storage or leakage; and if the difference of the comparison results is that the content of the tracer is lower than 1.0 nanoliter/cubic meter, the tracer is not detected, and the underground gas storage is not subjected to detectable string storage or leakage.
The methods provided in the examples of the present application will be further illustrated by the following optional examples.
Referring to fig. 3, this embodiment provides two adjacent salt chambers for illustration, a first salt chamber 109 into which the tracer is injected, and a second salt chamber 110 adjacent to the first salt chamber into which the tracer is injected, with sampling points set according to the direction of possible gas leakage in the salt chamber 6. Referring to fig. 2, it can be seen that there is a fault 106 between the salt chamber 6 and the surface, and the following sampling points are taken according to the direction of possible leakage of natural gas, such as the possible leakage direction 107 of gas in the production casing and the possible leakage direction 108 of gas in the salt chamber shown in fig. 2.
Salt chamber production casing well head sample point 101, the tracer pours into salt chamber production casing well head sample point 102, salt chamber annulus well head sample point 103, the tracer pours into salt chamber annulus well head sample point 104, earth's surface sample point 105. At a salt cavity production casing wellhead sampling point 101, injecting a tracer into a salt cavity production casing wellhead sampling point 102, a salt cavity annulus wellhead sampling point 103, and a tracer injection salt cavity annulus wellhead sampling point 104, taking a gas sample for analysis, and taking a soil sample at an earth surface sampling point 105 for analysis to obtain a first analysis result; the first analysis result is taken as a background value for monitoring, and the tracer and the dosage are selected, and optionally, the concentration content of the tracer can be 1.0 ml/cubic meter.
In the process of injecting the natural gas into the salt cavity 6, a proper amount of tracer is added into the injected natural gas through a ground process facility, and the tracer is injected into the salt cavity 6 along with the natural gas.
After the tracer is injected into the salt cavity 6, periodically sampling points 101 at the wellhead of the production casing of the salt cavity, the tracer is injected into sampling points 102 at the wellhead of the production casing of the salt cavity, sampling points 103 at the wellhead of the annulus of the salt cavity, the tracer is injected into sampling points 104 at the wellhead of the annulus of the salt cavity, sampling is carried out at sampling points 105 on the earth surface, the content of the tracer in the gas is tested, the content of the tracer is compared with a background value (namely a first analysis result obtained before the tracer is not injected), and whether the cavity and the casing leak or not and the leakage degree are judged according to the change of the content of the tracer. In an example, when the content of the tracer in the second analysis result exceeds 1.0 nanoliter/cubic meter, the underground gas storage is proved to be in series or leaked; and when the content of the tracer in the second analysis result is lower than 1.0 nanoliter/cubic meter, the tracer is not detected, and the underground gas storage is not subjected to detectable string storage or leakage.
In another aspect, the present invention also provides an apparatus for monitoring leakage of an underground gas storage, referring to fig. 4, the apparatus including:
the first analysis unit 401 is configured to analyze the natural gas in the underground gas storage to obtain a first analysis result;
a selecting unit 402, configured to select a tracer according to the first analysis result;
an injection unit 403 for injecting a tracer into the underground gas reservoir;
a second analysis unit 404, configured to analyze the natural gas in the underground gas reservoir into which the tracer is injected within a reference time to obtain a second analysis result;
a comparing unit 405, configured to compare the second analysis result with the first analysis result to obtain a comparison result;
and the judging unit 406 is used for judging whether the underground gas storage is leaked or not according to the comparison result.
Optionally, the underground gas storage comprises a plurality of salt cavities buried underground, a production casing connected with each salt cavity, and a technical casing sleeved outside the production casing, wherein an annulus is formed between the production casing and the technical casing, and one ends of the production casing and the technical casing extend to the ground;
optionally, the underground gas storage comprises a plurality of salt cavities buried underground, a production casing connected with each salt cavity, and a technical casing sleeved outside the production casing, wherein an annulus is formed between the production casing and the technical casing, and one ends of the production casing and the technical casing extend to the ground;
a first analysis unit 401 comprising:
the first acquisition unit is used for analyzing the production casing of one salt cavity and the natural gas in the annulus to obtain a first analysis sub-result;
the second acquisition unit is used for analyzing the natural gas in the production casings and the annuluses of the salt cavities adjacent to the salt cavities to obtain a second analysis sub-result;
the third acquisition unit is used for acquiring the soil sample within a reference range by taking the salt cavity as the center, and analyzing the soil sample to obtain a third analysis sub-result;
and the fourth acquisition unit is used for taking the first analysis sub result, the second analysis sub result and the third analysis sub result as the first analysis result.
Optionally, a selecting unit 402 is configured to select a tracer according to the first, second and third analysis result.
Optionally, the second analysis unit 404 is configured to analyze the production casing of the salt cavity and the natural gas in the annulus to obtain a first analysis value;
analyzing the natural gas in the production casings and the annuluses of the salt cavities adjacent to the salt cavities to obtain a second analysis value;
acquiring a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis value;
and taking the first analysis value, the second analysis value and the third analysis value as a second analysis result.
Optionally, the comparing unit 405 is configured to compare the first analysis result with the first analysis value, so as to obtain a first comparison result;
comparing the second analysis sub-result with the second analysis value to obtain a second comparison result;
comparing the third analysis sub-result with the second analysis value to obtain a third comparison result;
and taking at least one of the first comparison result, the second comparison result and the third comparison result as a comparison result.
Optionally, the determining unit 406 is configured to determine that the underground gas storage reservoir is leaked when any one of the first comparison result, the second comparison result and the third comparison result contains the tracer.
Optionally, the injection unit 403 is used for injecting the tracer into the underground gas storage with the mass ratio of the tracer to the natural gas in the underground gas storage being 1-1.5.
Optionally, the apparatus further comprises: the judgment subunit is used for judging the leakage degree of the underground gas storage according to the values of the first comparison result, the second comparison result and/or the third comparison result;
the greater the amount of tracer contained in any of the first, second and third comparison results, the greater the extent of leakage from the underground reservoir.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only exemplary of the present application and should not be taken as limiting the scope of the present application, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present application should be included in the scope of the present application.
Claims (8)
1. A method of monitoring the leakage of an underground reservoir comprising a plurality of salt cavities buried underground, a production casing connected to each salt cavity, a technical casing sleeved outside the production casing, an annulus formed between the production casing and the technical casing, one end of the production casing and one end of the technical casing extending to the ground, the method comprising:
analyzing the production casing of one salt cavity and the natural gas in the annulus to obtain a first analytical sub-result;
analyzing the natural gas in the production casing and the annular space of the salt cavities adjacent to the salt cavities to obtain a second sub-analysis result;
obtaining a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis sub-result;
taking the first, second and third analyte results as first analysis results;
selecting a tracer according to the first analysis result;
injecting the tracer into the underground gas reservoir;
analyzing the natural gas injected into the underground gas reservoir of the tracer after the reference time to obtain a second analysis result;
comparing the second analysis result with the first analysis result to obtain a comparison result;
and judging whether the underground gas storage is leaked or not according to the comparison result.
2. The method of claim 1, wherein said selecting a tracer based on said first analysis comprises: and selecting a tracer according to the first, second and third analysis sub-results.
3. The method of claim 1, wherein analyzing the natural gas injected into the tracer-bearing underground reservoir after the reference time has elapsed to obtain a second analysis result comprises:
analyzing the production casing of the salt cavity and the natural gas in the annulus to obtain a first analysis value;
analyzing the natural gas in the production casing and the annular space of a plurality of salt cavities adjacent to the salt cavities to obtain a second analysis value;
acquiring a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis value;
taking the first analysis value, the second analysis value, and the third analysis value as the second analysis result.
4. The method of claim 3, wherein comparing the second analysis result with the first analysis result to obtain a comparison result comprises:
comparing the first analysis sub-result with the first analysis value to obtain a first comparison result;
comparing the second analysis sub-result with the second analysis value to obtain a second comparison result;
comparing the third analysis sub-result with the third analysis value to obtain a third comparison result;
and taking at least one of the first comparison result, the second comparison result and the third comparison result as the comparison result.
5. The method of claim 4, wherein said determining whether the underground reservoir is leaking based on the comparison comprises:
and when any one of the first comparison result, the second comparison result and the third comparison result contains the tracer, judging that the underground gas storage is leaked.
6. The method of claim 1, wherein said injecting the tracer into the subsurface reservoir comprises: the mass ratio of the tracer injected into the underground gas storage to the natural gas in the underground gas storage is 1-1.5.
7. The method of claim 4, further comprising: judging the leakage degree of the underground gas storage according to the values of the first comparison result, the second comparison result and/or the third comparison result;
the greater the extent to which the subterranean reservoir leaks when any of the first, second and third comparison results contains the greater the amount of the tracer.
8. The utility model provides a device that monitoring underground gas storage leaked, its characterized in that, underground gas storage include a plurality of production sleeve pipes of burying underground the salt chamber, being connected with every salt chamber, the cover is established the outside technical sleeve pipe of production sleeve pipe, production sleeve pipe with form the annular space between the technical sleeve pipe, production sleeve pipe with technical sleeve's one end extends to ground, the device includes:
the first analysis unit is used for analyzing the production casing of one salt cavity and the natural gas in the annulus to obtain a first analysis sub-result; analyzing the natural gas in the production casing and the annular space of the salt cavities adjacent to the salt cavities to obtain a second sub-analysis result; obtaining a soil sample within a reference range by taking the salt cavity as a center, and analyzing the soil sample to obtain a third analysis sub-result; taking the first, second and third analyte results as first analysis results;
a selecting unit for selecting a tracer according to the first analysis result;
an injection unit for injecting the tracer into the underground gas reservoir;
the second analysis unit is used for analyzing the natural gas injected into the underground gas storage of the tracer after the reference time, and obtaining a second analysis result;
the comparison unit is used for comparing the second analysis result with the first analysis result to obtain a comparison result;
and the judging unit is used for judging whether the underground gas storage is leaked or not according to the comparison result.
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