CN117610766A - Method and system for evaluating site selection of underground salt cavern type storage of compressed air energy storage power station - Google Patents
Method and system for evaluating site selection of underground salt cavern type storage of compressed air energy storage power station Download PDFInfo
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Abstract
The invention provides a site selection evaluation method and a system for an underground salt cavern type storage of a compressed air energy storage power station, wherein the site selection evaluation method for the underground salt cavern type storage comprises the following steps: s1: determining the area of the preselected salt cavern: s2: salt pit pretreatment is carried out in the area where the preselected salt pit is located, and pretreatment data are obtained; s3: according to the preprocessing data and the historical data in the area where the preselected salt cavern is located, salt cavern stability assessment and parameter design are carried out, and preset parameter data of a preset salt cavern are obtained; s4: the method can realize effective site selection of the underground salt cavern type reservoir of the compressed air energy storage power station aiming at the existing solution cavity.
Description
[ field of technology ]
The invention relates to the technical field of decision analysis, in particular to a method and a system for evaluating underground salt cavern type storage sites of a compressed air energy storage power station.
[ background Art ]
In recent years, the electric power demand of China is growing, and the climate problem, the air quality problem and the social influence problem generated by the electric power demand are becoming more and more important.
Compressed Air Energy Storage (CAES) is a widely used energy storage technology that uses free electricity to compress and store air in an underground cavern, and when the electricity demand is high, the air is released and used for power generation. However, salt cavern type reservoirs, one of the main types of gas reservoirs, are located as difficulties to be overcome due to the particularities of their geological conditions.
At present, the research proves that the salt cavern type reservoir can be used for a gas storage of a compressed air energy storage power station. However, its use is also affected by various factors such as sealability, stability and usability of salt caves. If not considered and evaluated sufficiently, the factors may cause problems such as cracking, leakage and the like of the gas storage in the use process, so that serious engineering problems and potential safety hazards are caused.
In the prior art, no relevant standard is available for site selection of salt cavern type reservoirs, and site selection mainly depends on empirical judgment and geological exploration results. However, these methods often cannot comprehensively and systematically consider the influencing factors of the salt cavern type compressed air energy storage power station reservoir, so that the optimal salt cavern site cannot be selected.
Accordingly, there is a need to develop a method and system for site selection and evaluation of underground salt caverns of a compressed air energy storage power station that addresses the deficiencies of the prior art and solves or alleviates one or more of the problems mentioned above.
[ invention ]
In view of the above, the invention provides a site selection evaluation method and a system for an underground salt cavern type reservoir of a compressed air energy storage power station, which can realize effective site selection of the underground salt cavern type reservoir of the compressed air energy storage power station aiming at the existing solution cavity.
In one aspect, the invention provides a site selection evaluation method for an underground salt cavern type storage of a compressed air energy storage power station, which comprises the following steps:
s1: determining the area of the preselected salt cavern:
s2: salt pit pretreatment is carried out in the area where the preselected salt pit is located, and pretreatment data are obtained;
s3: according to the preprocessing data and the historical data in the area where the preselected salt cavern is located, salt cavern stability assessment and parameter design are carried out, and preset parameter data of a preset salt cavern are obtained;
s4: and carrying out tightness evaluation on preset parameter data of the preset salt cavern.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, where the S1 specifically includes:
s11: acquiring historical salt cavern evaluation data and regional site selection evaluation data of a plurality of regions;
s12: setting a first evaluation index of a preselected salt cavern;
s13: calculating historical first evaluation indexes corresponding to the first evaluation indexes in the plurality of areas according to historical salt cavern evaluation data and area site selection evaluation data of the plurality of areas;
s14: and comparing the historical first evaluation indexes corresponding to the first evaluation indexes, presetting the meeting conditions, and selecting the area where the historical first evaluation indexes meeting the conditions are located as the area where the preselected salt cavern is located.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, where the historical salt cavern evaluation data in S11 includes a well construction time, an in-service life, a salt layer burial depth, a salt layer thickness, an accumulated salt production amount, a central pipe size, a production casing size, a production mode, a well group communication status, a service condition, and a wellhead coordinate, and the regional site selection evaluation data includes a geological parameter and a coordinate parameter.
The aspect and any possible implementation manner as described above further provide an implementation manner, where the first evaluation index in S1 includes a stability preliminary evaluation, a tightness preliminary evaluation, and an availability preliminary evaluation, where the stability evaluation preset satisfaction condition includes that a depth of a cavity top burial depth adaptation stratum is-500 m to-1500 m, a pillar width is not less than 100m, and the tightness preliminary evaluation preset satisfaction condition includes that a block fault,Roof lithology, salt-bearing layer thickness, interlayer tightness, cavity communication and water pressure test, and the usability preliminary evaluation meets the preset conditions that 19-21 ten thousand m is needed for every 10 ten thousand kW energy storage machine 3 The effective volume of the dissolution cavity.
In the foregoing aspect and any possible implementation manner, there is further provided an implementation manner, where the S2 specifically includes:
s21: performing shaft treatment, shaft detection and sonar cavity detection in the region where the preselected salt cavern is located;
s22: geophysical prospecting and drilling are performed in the area of the preselected salt cavern.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where the wellbore treatment in S21 includes performing a central pipe lifting, well logging and well flushing in a preselected salt cavern, the wellbore detection includes performing gyroscopic measurements, natural gamma measurements, acoustic amplitude measurements, variable density measurements, electromagnetic flaw detection measurements, borehole diameter measurements and well temperature measurements in a wellbore of the preselected salt cavern, the geophysical prospecting is a three-dimensional seismic survey in a wellbore region of the preselected salt cavern, the drilling is a data well selection, and the earth stress testing and logging are performed, and a range of the data well coring includes: the salt cavern top plate, the target salt cavern section and the salt cavern bottom plate, and the coring length of the salt cavern bottom plate is not less than 100m.
In the aspect and any possible implementation manner as described above, further providing an implementation manner, the stability evaluation in S3 is specifically: presetting a second evaluation index, calculating and obtaining a second historical evaluation index corresponding to the second evaluation index through historical salt cavern evaluation data and preprocessing data, comparing the second evaluation index with the second historical evaluation index, and determining that the salt cavern check stability meets the preset requirement if the second historical evaluation index meets the preset condition;
and the parameter design in the step S3 comprises a maximum operating pressure design, a minimum operating parameter design and a suggested operating pressure of the salt cavern type compressed air energy storage power station.
In the aspect and any possible implementation manner as described above, further providing an implementation manner, where the second evaluation index in S3 includes a three-dimensional geologic modeling evaluation, a cavity static stability evaluation, and a cavity long-term operation condition stability evaluation;
the cavity static stability assessment specifically comprises the following steps: performing static stability simulation calculation on a preset salt cavern under different operating pressures, wherein the pressure variation range comprises a design pressure variation range;
the long-term operating condition stability assessment of the cavity is specifically as follows: according to the salt cavern compressed air energy storage operation working condition, carrying out long-term stability simulation calculation under different operation working conditions on a preset salt cavern, and evaluating the change condition of the salt cavern volume caused by cavity creep in the whole operation period.
In aspects and any possible implementation manner as described above, there is further provided an implementation manner, where the salt cavity tightness evaluation in S4 includes: and (5) evaluating tightness of the top plate and the interlayer, analyzing tightness of the periphery of the salt cavern cavity and simulating tightness of the salt cavern.
In the aspect and any possible implementation manner described above, there is further provided a system for locating an underground salt cavern type repository of a compressed air energy storage power station, where locating is implemented by the method for evaluating an underground salt cavern type repository locating, and the system for locating an underground salt cavern type repository includes:
the region selection module is used for determining the region where the preselected salt cavern is located:
the salt pit pretreatment module is used for carrying out salt pit pretreatment in the area where the preselected salt pit is located to obtain pretreatment data;
the stability evaluation and parameter design module is used for performing salt pit stability evaluation and parameter design according to the preprocessing data and the historical data in the area where the preselected salt pit is located, and obtaining preset parameter data of a preset salt pit;
the tightness evaluation module is used for performing tightness evaluation on preset parameter data of preset salt caves.
Compared with the prior art, the invention can obtain the following technical effects:
1. systemization: the underground salt cavern type storage site selection system covers all aspects from region selection to tightness evaluation, forms an organic whole, and can perform site selection more comprehensively and efficiently.
2. Scientificalness: the system for selecting the site adopts the stability evaluation and parameter design module, can evaluate the stability of the salt cavern according to the historical data, and performs parameter design according to the pretreatment data and the preset parameter data of the preset salt cavern, so that the site selection process is more scientific and reasonable.
3. Practical application: the system has the advantages that all modules in the system are designed aiming at the problem of actual salt cavern site selection work, and the system has strong practicability. Particularly, the tightness evaluation module can timely find and solve the problems existing in the salt caves, so that the quality and stability of the salt caves are ensured.
4. Intelligent: the later stage of the site selection system can be combined with an artificial intelligence technology to realize partial automatic and intelligent site selection work. For example, the regions suitable as salt caves can be automatically identified and selected by techniques such as machine learning and deep learning, and salt caves design and parameter optimization can be automatically performed.
Of course, it is not necessary for any of the products embodying the invention to achieve all of the technical effects described above at the same time.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for site selection evaluation of an underground salt cavern type reservoir according to one embodiment of the present invention.
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As shown in fig. 1, the invention provides a site selection evaluation method for an underground salt cavern type storage of a compressed air energy storage power station, which comprises the following steps:
s1: determining the area of the preselected salt cavern:
s2: salt pit pretreatment is carried out in the area where the preselected salt pit is located, and pretreatment data are obtained;
s3: according to the preprocessing data and the historical data in the area where the preselected salt cavern is located, salt cavern stability assessment and parameter design are carried out, and preset parameter data of a preset salt cavern are obtained;
s4: and carrying out tightness evaluation on preset parameter data of the preset salt cavern.
The S1 specifically comprises the following steps:
s11: acquiring historical salt cavern evaluation data and regional site selection evaluation data of a plurality of regions;
s12: setting a first evaluation index of a preselected salt cavern;
s13: calculating historical first evaluation indexes corresponding to the first evaluation indexes in the plurality of areas according to historical salt cavern evaluation data and area site selection evaluation data of the plurality of areas;
s14: and comparing the historical first evaluation indexes corresponding to the first evaluation indexes, presetting the meeting conditions, and selecting the area where the historical first evaluation indexes meeting the conditions are located as the area where the preselected salt cavern is located.
The historical salt cavern evaluation data in the S11 comprise well construction time, service life, salt layer burial depth, salt layer thickness, accumulated salt production, central pipe size, production casing size, production mode, current well group communication status, service condition and wellhead coordinates, and the regional site selection evaluation data comprise geological parameters and coordinate parameters.
The first evaluation index in the S1 comprises a stability preliminary evaluation, a tightness preliminary evaluation and an availability preliminary evaluation, wherein the stability evaluation preset meeting condition comprises that the depth of a cavity top burial depth adaptive stratum is-500 m to-1500 m, the width of a ore pillar is not less than 100m, the tightness preliminary evaluation preset meeting condition comprises that the block fault, the roof lithology, the thickness of a salt-containing layer, the interlayer tightness, the cavity communication and the water pressure test are carried out, and the availability preliminary evaluation preset meeting condition is that 19-21 ten thousand m < 3 > of the effective volume of a solution cavity is needed for every 10 ten thousand kW of an energy storage machine.
The step S2 specifically comprises the following steps:
s21: performing shaft treatment, shaft detection and sonar cavity detection in the region where the preselected salt cavern is located;
s22: geophysical prospecting and drilling are performed in the area of the preselected salt cavern.
The well bore treatment in S21 comprises the steps of carrying out central tube lifting, well logging and well flushing on a preselected salt cavern, well bore detection comprises the steps of carrying out gyroscopic measurement, natural gamma measurement, acoustic amplitude measurement, variable density measurement, electromagnetic flaw detection measurement, well diameter measurement and well temperature measurement in a well bore of the preselected salt cavern, geophysical prospecting is carried out in a three-dimensional seismic exploration mode in a well bore area of the preselected salt cavern, drilling is carried out for selecting a data well for coring, a ground stress test and well logging, and the range of the data well coring comprises: the salt cavern top plate, the target salt cavern section and the salt cavern bottom plate, and the coring length of the salt cavern bottom plate is not less than 100m.
The stability evaluation in S3 specifically includes: presetting a second evaluation index, calculating and obtaining a second historical evaluation index corresponding to the second evaluation index through historical salt cavern evaluation data and preprocessing data, comparing the second evaluation index with the second historical evaluation index, and determining that the salt cavern check stability meets the preset requirement if the second historical evaluation index meets the preset condition;
and the parameter design in the step S3 comprises a maximum operating pressure design, a minimum operating parameter design and a suggested operating pressure of the salt cavern type compressed air energy storage power station.
The second evaluation index in the step S3 comprises three-dimensional geological modeling evaluation, cavity static stability evaluation and cavity long-term operation condition stability evaluation;
the cavity static stability assessment specifically comprises the following steps: performing static stability simulation calculation on a preset salt cavern under different operating pressures, wherein the pressure variation range comprises a design pressure variation range;
the long-term operating condition stability assessment of the cavity is specifically as follows: according to the salt cavern compressed air energy storage operation working condition, carrying out long-term stability simulation calculation under different operation working conditions on a preset salt cavern, and evaluating the change condition of the salt cavern volume caused by cavity creep in the whole operation period.
The salt pit tightness evaluation in S4 includes: and (5) evaluating tightness of the top plate and the interlayer, analyzing tightness of the periphery of the salt cavern cavity and simulating tightness of the salt cavern.
The invention also provides an underground salt cavern type reservoir site selection system of the compressed air energy storage power station, which realizes site selection through the underground salt cavern type reservoir site selection evaluation method, and comprises the following steps:
the region selection module is used for determining the region where the preselected salt cavern is located:
the salt pit pretreatment module is used for carrying out salt pit pretreatment in the area where the preselected salt pit is located to obtain pretreatment data;
the stability evaluation and parameter design module is used for performing salt pit stability evaluation and parameter design according to the preprocessing data and the historical data in the area where the preselected salt pit is located, and obtaining preset parameter data of a preset salt pit;
the tightness evaluation module is used for performing tightness evaluation on preset parameter data of preset salt caves.
Example 1:
the invention provides a site selection evaluation method of an underground salt cavern type reservoir of a compressed air energy storage power station, which comprises the following specific procedures:
(1) Collecting basic data;
presetting a pre-selected area, and collecting basic data of the pre-selected area (block), wherein the basic data collection mainly comprises: geological data collection, well engineering data collection, salt recovery data collection and other data collection.
Wherein the geological data comprises: seismic data of the drilled block and seismic layer velocity data; a geological research report; well placement patterns; geological logging data of drilled wells, data of geological analysis and assay and the like; physical and chemical analysis, physical property analysis and sensitivity analysis data of the drilled rock core and rock scraps, and strength test and drillability test data of the rock core; logging data such as conventional well logging, array acoustic imaging (DSI) of drilled wells; geographical environment of the region, mining, traffic, communication, weather, hydrology, electric power and disastrous geological phenomena.
Well engineering data includes: drilling design, construction summary, well completion summary, well cementation result, logging, underground accident and treatment condition are already carried out in the block.
Salt collection data includes: the method comprises the steps of salt mine development and utilization scheme, current situation of a brine-producing salt cavity, salt mine exploitation mode, salt cavity exploitation record, annual brine-producing amount, brine component analysis of the existing brine-producing well and other data, and estimated volume of the brine-producing well salt cavity and well group exploitation channeling data.
Other data include: basic conditions of roads and well sites, and conditions of wellhead equipment and pipelines of brine production cavities.
(2) According to the collection result of basic data, historical salt cavern evaluation data and regional site selection evaluation data are screened and obtained, and meanwhile, the historical salt cavern evaluation data and the regional site selection evaluation data are tabulated, and the method specifically comprises the following steps:
(3) Salt caves are initially selected and evaluated;
presetting a first evaluation index for an underground salt cavern type reservoir of a compressed air energy storage power station to be addressed, acquiring a first historical evaluation index corresponding to the first evaluation index through historical salt cavern evaluation data (including data of a salt well in service and data of a data well out of service) and regional site selection evaluation data (namely, the calculation and comparison modes of the first historical evaluation index are the same as those of the first evaluation index), comparing the first evaluation index with the first historical evaluation index, and determining a salt cavern primary selection region if the first historical evaluation index meets preset conditions.
The first evaluation index comprises a stability preliminary evaluation, a tightness preliminary evaluation and an availability preliminary evaluation;
the primary evaluation requirement of the stability comprises a cavity top burial depth and a pillar width, wherein the cavity top burial depth is suitable for the stratum depth of-500 m to-1500 m, wherein-600 m to-1200 m are optimal, and the pillar width is not suitable to be less than 100m;
the preliminary tightness evaluation comprises block fault, roof lithology, salt layer thickness, interlayer tightness, cavity communication condition and water pressure test condition. Block fault condition: the method avoids a large movable fracture zone for 5km, avoids actual measurement faults and presumption faults with unknown properties, and avoids areas which develop adverse geological effects and have direct harm or potential threat to the stability of plant sites. Roof lithology and salt layer thickness requirements: the top plate is used as a low permeability layer for protecting compressed air from escaping upwards, according to the regional geological condition of salt mine, gypsum rock, salt rock, mudstone or marl rock can be selected as a salt caved top plate, and the thickness of a reserved salt layer on the salt caved top plate is not smaller than 30 m, if the salt layer is good, the thickness of the salt layer of the top plate can be properly reduced, and if special conditions are met, special evaluation can be carried out so as to meet the sealing requirement. Interlayer sealability requirements: the average porosity of the sandwich core should be less than 10% and the average permeability should be less than 1 x 10 -16 ㎡。
The condition of cavity communication requires:
(1) The single well single cavity with clear cavity boundary or the opposite well horizontal cavity communicated with the cavity is preferably used as a salt cavern type compressed air energy storage alternative site;
(2) The cavities are communicated, and the cavities with unclear boundaries and controllable boundaries can be used as alternative sites.
(3) Water pressure test requirement: the water pressure test adopts a comprehensive pressure flow test method, namely, the pressure of the salt cavity is increased to a design value, and the design pressure is 0.5-0.8 times of the stratum fracture pressureRecording the injection amount of brine and the pressure change of a wellhead, pressurizing the cavity again after maintaining the pressure for a period of time, repeating the steps for a plurality of times, calculating the leakage amount of the cavity, drawing a change curve of the leakage amount along with time, if the leakage amount is smaller and smaller, and the pressure drop rate of the well in the last pressure maintaining process is smaller than 1 multiplied by 10 -3 MPa/h, the cavity is proved to have good tightness.
In the preliminary evaluation of availability, the energy storage machine needs 20 ten thousand meters per 10 ten thousand kW 3 The effective volume of the dissolution cavity is used for discrimination.
(4) Wellbore treatment, detection and sonar cavity measurement;
preprocessing an underground salt cavern type reservoir for the area meeting the primary selection, wherein the processing contents comprise shaft processing, shaft detection and sonar measuring cavity;
the well bore treatment comprises a central pipe lifting, a well dredging and well washing;
wellbore testing includes performing logging items such as gyroscopes, natural gamma, acoustic amplitude, variable density, electromagnetic flaw detection, borehole diameter, well temperature, and the like in a wellbore.
(5) Geophysical prospecting and drilling;
performing geophysical prospecting (geophysical prospecting) and drilling in a region meeting the primary selection, wherein the geophysical prospecting comprises three-dimensional seismic prospecting, and when the three-dimensional seismic prospecting is deployed, the deployment range of the three-dimensional seismic prospecting extends 100-300 m (the maximum value is taken according to the field condition) on the basis of a preprocessed shaft region (a target underground salt cavern region);
the drilling comprises data well coring, ground stress testing and logging, wherein the data well coring, the ground stress testing and the logging are all data wells, and the data wells are wells newly drilled for acquiring the data in the area meeting the initial selection condition. The size of the data well can be designed according to the drilling depth and the well structure requirement, but the final core sample diameter should not be less than 110mm.
The range of coring data wells should include: salt cave roof, target salt cave section, salt cave bottom plate. The coring length of the salt cavern bottom plate should not be less than 100m.
(6) Carrying out three-dimensional geological modeling and giving out salt cavern stability evaluation and parameter design;
presetting a second evaluation index for an underground salt cavern type reservoir of the compressed air energy storage power station to be addressed, calculating and obtaining a second historical evaluation index corresponding to the second evaluation index through historical salt cavern evaluation data, shaft processing, detection and sonar cavity measuring results and geophysical prospecting and drilling results (namely, the calculation and comparison modes of the second historical evaluation index are the same as those of the second evaluation index), comparing the second evaluation index with the second historical evaluation index, and determining that the salt cavern check stability meets preset requirements if the second historical evaluation index meets preset conditions.
The second evaluation index comprises three-dimensional geologic modeling evaluation, cavity static stability evaluation and cavity long-term operation condition stability evaluation.
The three-dimensional geologic modeling evaluation is specifically as follows: firstly, corresponding three-dimensional geologic modeling evaluation in the second historical evaluation index is based on data of a data well and a salt production well; the three-dimensional numerical modeling of the second historical evaluation index is based on sonar cavity measurement data of a cavity (a shaft area at a preset salt cavern), and when the three-dimensional cavity measurement data is not complete, the modeling is performed by referring to the three-dimensional seismic data, and the modeling is performed by comparing and checking with the data of old salt cavern drilling completion, new data wells and the like. And the stability of the salt caves is evaluated by simulating and analyzing the number of plastic damage area units around the cavity, the cavity displacement distribution condition and the cavity circumferential stress under various operation conditions, and the operation parameters of the salt cavern gas storage are adjusted and optimized according to the evaluation results. The specific evaluation requirements are as follows:
(1) Under the working conditions of different design internal pressures, the number of plastic damage areas around the cavity is obviously reduced along with the increase of the internal pressure, and no plastic damage area exists after the design pressure is reached;
(2) Under different design internal pressure working conditions, the integral displacement change in the static force stabilization process is very small, and the design requirement can be met;
(3) Under the action of different design internal pressure working conditions, the tensile stress appearing in the cavity is smaller than the tensile strength of surrounding rock, and no obvious stress concentration area exists under the design internal pressure, so that the static stability requirement can be met.
The cavity static stability assessment is specifically as follows: and performing static stability simulation calculation on the preset salt caves under different operating pressures, wherein the pressure fluctuation range comprises a design pressure fluctuation range, and performing ultimate pressure fluctuation stability evaluation when conditions allow, so as to give the minimum operating pressure of the salt caves. Namely, the pressure fluctuation range of the target salt cavern calculated correspondingly in the second historical evaluation index is compared with the pressure fluctuation range of the preset salt cavern in the second historical evaluation index, and if the pressure fluctuation range of the preset salt cavern is within the pressure fluctuation range of the second historical evaluation index, the preset requirement is met.
The analog calculation method is as follows:
the long-term operating condition stability assessment of the cavity is specifically as follows: according to the salt cavern compressed air energy storage operation working condition, long-term stability (30 years) simulation calculation under different operation working conditions is carried out on a preset salt cavern, and the change condition of the salt cavern volume caused by cavity creep in the whole operation period is estimated. The range of the creep shrinkage evaluation period should cover the design life of the compressed air energy storage power station, and the volume change value caused by creep shrinkage is provided, and meanwhile, the ground subsidence evaluation result should be provided. The salt pit volume change caused by the creep of the cavity of the target salt pit in the second historical evaluation index is compared with the salt pit volume change in the second historical evaluation index and the preset salt pit volume change, and if the preset salt pit volume change is within the volume change range in the second historical evaluation index, the preset requirement is met.
Salt cavern operating parameter design mainly includes: maximum operating pressure design, minimum operating parameter design, and salt cavern type compressed air energy storage power station recommended operating pressure.
And giving a maximum operating pressure design value based on the stratum condition of the data well and the ground stress test condition.
The specific calculation mode is as follows:
P max ＝ρ×H×X
wherein:
P max -a maximum operating pressure design value (kPa) for the cavity;
h, cavity top plate depth (m);
ρ is the average density of stratumVerification value (kN/m) 3 )；
X-is a safety factor (generally 0.75-1.0).
And (5) giving a minimum operating pressure parameter design value through stability simulation calculation.
The specific calculation mode is as follows:
P min ＝K·M·P max
wherein:
P min -a cavity minimum operating pressure design value (kPa);
m-in the results of the stability numerical simulation, the internal pressure and P corresponding to the salt cavern top safety factor of 1 max Is a ratio of (2);
k, the safety coefficient (generally 1.2-1.5);
and the salt cavern compressed air energy storage recommended operating pressure is given by combining the ground equipment capacity.
The specific calculation mode is as follows: it is recommended that the operating pressure be 0.8 times the pressure generated at the rated power of the surface equipment.
(6) Salt cavern sealability assessment
Salt cavern sealability evaluation is carried out on a preset salt cavern, and the salt cavern sealability evaluation mainly comprises the following steps: and (5) evaluating tightness of the top plate and the interlayer, analyzing tightness of the periphery of the salt cavern cavity and simulating tightness of the salt cavern.
The top plate and interlayer tightness evaluation includes: and (3) carrying out experiments such as permeability, electron microscope scanning, X diffraction, breakthrough pressure and the like on the top plate and the interlayer obtained by coring the data well, and evaluating the sealing performance of the top plate and the interlayer.
The salt cavern periluminal sealability analysis includes: confirming the thickness of a salt layer of a salt cavern top plate, communicating a target salt cavern with a nearby salt cavern, confirming safety ore pillars around the target salt cavern, and confirming the sealing of the bottom of the salt cavern.
Salt cavern sealability simulation includes: and carrying out three-dimensional geological modeling on the salt cavern, carrying out long-term simulation on the tightness based on the permeability obtained by the test, and evaluating.
The method and the system for evaluating the site selection of the underground salt cavern type storage of the compressed air energy storage power station provided by the embodiment of the application are described in detail. The above description of embodiments is only for aiding in understanding the method of the present application and its core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth the preferred embodiment for carrying out the present application, but is not intended to limit the scope of the present application in general, for the purpose of illustrating the general principles of the present application. The scope of the present application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that this application is not limited to the forms disclosed herein, but is not to be construed as an exclusive use of other embodiments, and is capable of many other combinations, modifications and environments, and adaptations within the scope of the teachings described herein, through the foregoing teachings or through the knowledge or skills of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.
Claims (10)
1. The method for evaluating the site selection of the underground salt cavern type storage in the compressed air energy storage power station is characterized by comprising the following steps of:
s1: determining the area of the preselected salt cavern:
s2: salt pit pretreatment is carried out in the area where the preselected salt pit is located, and pretreatment data are obtained;
s3: according to the preprocessing data and the historical data in the area where the preselected salt cavern is located, salt cavern stability assessment and parameter design are carried out, and preset parameter data of a preset salt cavern are obtained;
s4: and carrying out tightness evaluation on preset parameter data of the preset salt cavern.
2. The method for site selection evaluation of an underground salt cavern type reservoir according to claim 1, wherein S1 specifically comprises:
s11: acquiring historical salt cavern evaluation data and regional site selection evaluation data of a plurality of regions;
s12: setting a first evaluation index of a preselected salt cavern;
s13: calculating historical first evaluation indexes corresponding to the first evaluation indexes in the plurality of areas according to historical salt cavern evaluation data and area site selection evaluation data of the plurality of areas;
s14: and comparing the historical first evaluation indexes corresponding to the first evaluation indexes, presetting the meeting conditions, and selecting the area where the historical first evaluation indexes meeting the conditions are located as the area where the preselected salt cavern is located.
3. The method according to claim 2, wherein the historical salt cavern evaluation data in S11 includes well construction time, age, salt layer burial depth, salt layer thickness, accumulated salt production, central pipe size, production casing size, production mode, well group current status, service condition and wellhead coordinates, and the regional site evaluation data includes geological parameters and coordinate parameters.
4. The method according to claim 3, wherein the first evaluation index in S1 comprises a preliminary stability evaluation, a preliminary sealability evaluation and a preliminary usability evaluation, wherein the preliminary stability evaluation meeting conditions comprise a depth of a cavity top burial depth adaptation stratum of-500 m to-1500 m, a pillar width of not less than 100m, the preliminary sealability evaluation meeting conditions comprise a block fault, a roof lithology, a salt layer thickness, a sandwich sealability, a cavity communication and a water pressure test, and the preliminary usability evaluation meeting conditions comprise a requirement of 19-21 ten thousand m for every 10 ten thousand kW of energy storage machines 3 The effective volume of the dissolution cavity.
5. The method for site selection evaluation of an underground salt cavern type repository according to claim 4, wherein the step S2 specifically comprises:
s21: performing shaft treatment, shaft detection and sonar cavity detection in the region where the preselected salt cavern is located;
s22: geophysical prospecting and drilling are performed in the area of the preselected salt cavern.
6. The method of claim 5, wherein the step S21 of wellbore treatment comprises lifting a central pipe, perforating and flushing a well in a preselected salt cavern, the step of wellbore detection comprises gyroscopic measurement, natural gamma measurement, sonic amplitude measurement, variable density measurement, electromagnetic flaw detection measurement, borehole diameter measurement and well temperature measurement in a well bore of the preselected salt cavern, the step of geophysical prospecting is a step of three-dimensional seismic prospecting in a well bore area of the preselected salt cavern, the step of drilling is a step of selecting a data well for coring, a step of geostress testing and a step of logging, and the step of coring the data well includes: the salt cavern top plate, the target salt cavern section and the salt cavern bottom plate, and the coring length of the salt cavern bottom plate is not less than 100m.
7. The method for site selection evaluation of an underground salt cavern type reservoir according to claim 6, wherein the stability evaluation in S3 is specifically: presetting a second evaluation index, calculating and obtaining a second historical evaluation index corresponding to the second evaluation index through historical salt cavern evaluation data and preprocessing data, comparing the second evaluation index with the second historical evaluation index, and determining that the salt cavern check stability meets the preset requirement if the second historical evaluation index meets the preset condition;
and the parameter design in the step S3 comprises a maximum operating pressure design, a minimum operating parameter design and a suggested operating pressure of the salt cavern type compressed air energy storage power station.
8. The method for site selection evaluation of an underground salt cavern type repository according to claim 7, wherein the second evaluation index in S3 includes three-dimensional geologic modeling evaluation, cavity static stability evaluation and cavity long-term operation condition stability evaluation;
the cavity static stability assessment specifically comprises the following steps: performing static stability simulation calculation on a preset salt cavern under different operating pressures, wherein the pressure variation range comprises a design pressure variation range;
the long-term operating condition stability assessment of the cavity is specifically as follows: according to the salt cavern compressed air energy storage operation working condition, carrying out long-term stability simulation calculation under different operation working conditions on a preset salt cavern, and evaluating the change condition of the salt cavern volume caused by cavity creep in the whole operation period.
9. The method of claim 1, wherein the evaluating salt cavern sealability in S4 comprises: and (5) evaluating tightness of the top plate and the interlayer, analyzing tightness of the periphery of the salt cavern cavity and simulating tightness of the salt cavern.
10. An underground salt cavern type storage site selection system of a compressed air energy storage power station, which realizes site selection by the underground salt cavern type storage site selection evaluation method as set forth in any one of claims 1 to 9, wherein the underground salt cavern type storage site selection system comprises:
the region selection module is used for determining the region where the preselected salt cavern is located:
the salt pit pretreatment module is used for carrying out salt pit pretreatment in the area where the preselected salt pit is located to obtain pretreatment data;
the stability evaluation and parameter design module is used for performing salt pit stability evaluation and parameter design according to the preprocessing data and the historical data in the area where the preselected salt pit is located, and obtaining preset parameter data of a preset salt pit;
the tightness evaluation module is used for performing tightness evaluation on preset parameter data of preset salt caves.
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