CN-122022519-A - Scheduling method and system for summer Chu Dong of metamorphic aquifer

CN122022519ACN 122022519 ACN122022519 ACN 122022519ACN-122022519-A

Abstract

The application is suitable for the technical field of computer-aided optimization scheduling, and provides a scheduling method and a system for summer Chu Dong of a burnt rock aquifer, wherein the method comprises the steps of constructing a three-dimensional digital twin model representing fracture space distribution and seepage characteristics based on multi-scale geological survey data of a coal seam spontaneous combustion area; according to the spatial variation characteristics of permeability in the three-dimensional digital twin model, a metamorphic aquifer is dynamically divided into three functional units of a high-speed channel area, a detention area and a heat insulation area, differential injection regulation and control based on real-time calculation of the three-dimensional digital twin model is executed in a summer heat storage period, thermophysical parameters of different functional units are updated through fusion of real-time monitoring data dynamic inversion, an optimal heat injection distribution strategy is solved, a differential heat injection instruction for each functional unit is generated, and the technical scheme of the embodiment of the application enables a computer-aided optimal scheduling technology to be deeply integrated into the whole process control of metamorphic heat storage, so that the heat recovery efficiency is remarkably improved.

Inventors

LU CUNJIN
BIAN KAI
DING YANQING
ZHANG XIAOLI
XU JINPENG
JIANG CHUNLU

Assignees

中国矿业大学
河北工程大学

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. A method for scheduling summer Chu Dong for a metamorphic aquifer, comprising: constructing a three-dimensional digital twin model for representing fracture space distribution and seepage characteristics based on multi-scale geological survey data of a coal seam spontaneous combustion area; Dynamically dividing the burnt rock aquifer into three functional units, namely a high-speed channel region, a detention region and a heat insulation region according to the spatial variation characteristics of permeability in the three-dimensional digital twin model; Performing differential injection regulation and control based on real-time calculation of the three-dimensional digital twin model in a summer heat storage period, updating thermophysical parameters of different functional units through dynamic inversion by fusing real-time monitoring data, solving an optimal heat injection distribution strategy, and generating differential heat injection instructions for the functional units, wherein the real-time monitoring data comprise wellhead temperature, wellhead flow and wellhead pressure; And performing gradient extraction and reverse cold impact cooperative regulation and control in a heat extraction period in winter, extracting heat from the high-speed channel region and the detention region in a grading manner, and injecting reverse cold water into the periphery of a heat storage core sub-region in the detention region so as to drive the heat to directionally migrate to a water extraction well.
2. The method for scheduling summer Chu Dong for a metamorphic aquifer of claim 1, wherein constructing a three-dimensional digital twin model characterizing fracture spatial distribution and seepage characteristics based on multi-scale geological survey data of a spontaneous combustion region of the coal seam comprises: delineating the boundary and thickness of the burnt rock plane at the regional scale, extracting a single-hole fracture opening distribution histogram at the hole scale, and acquiring a local fracture permeability coefficient at the point scale to form the multi-scale geological survey data of the surface-line-point; After registering the multi-scale geological survey data according to a unified space coordinate system, introducing Bayesian data fusion, taking single-hole fracture opening as prior distribution, taking local fracture permeability coefficient as likelihood function, and inverting to generate fracture geometry parameter sets of each hexahedral grid unit; Based on each grid unit, a permeability tensor field is built according to the real-time wellhead temperature, rock quality indexes and the fracture surface normal vector direction, a thermal-flow coupling equation is embedded, and a three-dimensional digital twin model which is coupled with temperature-stress-damage and updated on line along with wellhead temperature and wellhead pressure is built.
3. The scheduling method for summer Chu Dong of a metamorphic aquifer according to claim 2, wherein said establishing a permeability tensor field based on each of said grid cells according to real-time wellhead temperature, rock quality index, fracture surface normal vector direction and embedding a thermal-flow coupling equation, establishing a three-dimensional digital twin model of temperature-stress-damage coupling and online updating with wellhead temperature, wellhead pressure comprises: Determining the thermal expansion amount of the fracture wall by utilizing the wellhead temperature monitored in real time and adopting a thermoelastic theory to correct the original opening in real time so as to form a dynamic opening; according to the rock quality index-temperature experience relation, correcting the rock quality index into a temperature sensitive function related to temperature as a damage reduction coefficient; Constructing an anisotropic permeability tensor based on fracture surface normal vectors obtained by drilling imaging; Fusing the dynamic opening, the damage reduction coefficient and the anisotropic permeability tensor to obtain a temperature-stress-damage-direction quadruple corrected permeability tensor field; embedding the permeability tensor field into a preset thermal-flow coupling control equation, and establishing a temperature-stress-damage coupled three-dimensional digital twin model which can be updated on line along with the wellhead temperature and wellhead pressure monitored in real time.
4. A method for scheduling a summer Chu Dong for a metamorphic aquifer according to any one of claims 1-3, wherein the performing differential injection regulation based on real-time calculation of the three-dimensional digital twin model in the summer heat storage period, updating the thermophysical parameters of different functional units by fusion of real-time monitoring data dynamic inversion, and solving an optimal heat injection allocation strategy, and generating differential heat injection instructions for each functional unit comprises: the thermal-flow front migration rate of each functional unit is calculated in real time by a three-dimensional digital twin model of temperature-stress-damage coupling, compared with a preset threshold value, and if the deviation exceeds an allowable range, the regulation and control instruction is triggered to update; And taking the updated thermophysical parameters as input, and solving a heat injection temperature time sequence curve and a nonlinear flow distribution curve of each region by multi-objective optimization to generate a differential heat injection instruction.
5. The scheduling method for summer Chu Dong of a metamorphic aquifer according to claim 4, wherein the generating the differential heat injection instruction by taking the updated thermophysical parameters as input and solving the heat injection temperature time sequence curve and the nonlinear flow distribution curve of each region through multi-objective optimization comprises: The method comprises the steps of constructing a dynamic multi-objective optimization model by taking maximization of heat storage capacity of a detention area and minimization of heat loss of a high-speed channel area as objective functions and taking the upper limit of a rock mass damage variable as constraint, and obtaining an optimization result by rolling and optimizing a heat injection temperature time sequence curve and a nonlinear flow distribution curve in a future period by taking updated temperature-stress-damage coupling thermophysical parameters as input through a model prediction control framework based on the dynamic multi-objective optimization model; and converting the optimization result into the executable differential heat injection instruction so as to actively control the heat storage front.
6. A scheduling method for summer Chu Dong of a rock-firing aquifer according to any one of claims 1-3, wherein any two wells in the same well row are respectively located in a high-speed channel region and a detention region, the same well is a water injection well in summer and a water taking well in winter, gradient extraction and reverse cold impact cooperative regulation and control are performed in the winter heat taking period, heat is extracted from the high-speed channel region and the detention region in a grading manner, and reverse cold water is injected into the periphery of a heat storage core sub-region in the detention region to drive heat to directionally migrate to the water taking well, and the method comprises the following steps: The method comprises the steps of acquiring real-time monitoring data of each functional unit, storing the real-time monitoring data into a time sequence database as an original observation sequence for residual calculation, carrying out sliding window analysis on the time sequence data set, automatically generating a switching signal when the outlet temperature of a high-speed channel area is reduced to a set threshold value, activating a main extraction mode of a retention area based on the switching signal, injecting reverse cold water in a pulse mode at the periphery of a heat storage core subarea, and dynamically adjusting the flow and period of pulse injection until the wellhead temperature of the retention area is lower than a target value through the cold front migration rate monitored in real time.
7. The method of scheduling a variable-rock aquifer for summer Chu Dong as defined in claim 6, wherein dynamically adjusting the pulse injection flow rate and period until the wellhead temperature in the hold-up zone is below the target value by monitoring the cold front migration rate in real time comprises: estimating the cold front migration rate by utilizing the online inversion of the temperature measuring points at the periphery of the heat storage core subregion; Comparing the estimated cold front migration rate with a preset target interval, adjusting the pulse flow in proportion if the cold front migration rate is higher, and adjusting the pulse flow in proportion if the cold front migration rate is lower; The pulse injection period is synchronously adjusted according to the inverse proportion relation, so that the cold front is ensured to reach the water intake well within a preset period; When the wellhead temperature of the stagnation zone is lower than the target value for two continuous sampling periods, pulse injection is automatically terminated and the conventional extraction mode is switched.
8. A method of scheduling for a summer Chu Dong for a metamorphic aquifer according to any one of claims 1 to 3, further comprising: acquiring wellhead flow, wellhead temperature, wellhead pressure and wellhead temperature field data of each functional unit in real time, and storing the wellhead flow, wellhead temperature, wellhead pressure and wellhead temperature field data into a time sequence database as an original observation sequence for residual calculation; carrying out sliding window residual analysis on the original observation sequence by taking a predicted value of the three-dimensional digital twin model as a reference to generate a systematic deviation signal; Inputting the systematic deviation signals into a second set of Kalman filtering, and correcting the main value and direction of the fracture permeability tensor on line to update model parameters; And (3) writing the updated permeability tensor field back to the digital twin kernel as an initial field of the next heat storage-extraction period.
9. A method for scheduling a summer Chu Dong for a metamorphic aquifer according to any one of claims 1-3, wherein dynamically dividing the metamorphic aquifer into three functional units, namely a high-speed channel region, a retention region and a heat insulation region, according to the spatial variation characteristics of permeability in the three-dimensional digital twin model comprises: dividing a strip area with permeability greater than a first permeability interval into a high-speed channel area; dividing a strip area with permeability greater than a second permeability interval and less than a first permeability interval and a rock quality index lower than a preset threshold value into a detention area; Dividing a strip region with permeability less than the second permeability interval into a heat insulation region; the high-speed channel region, the detention region and the heat insulation region automatically migrate along with the updating of the three-dimensional digital twin model so as to carry out dynamic division reconstruction.
10. A scheduling system for summer Chu Dong of a metamorphic aquifer, characterized in that a scheduling method for summer Chu Dong of a metamorphic aquifer according to any one of claims 1-9 is applied, comprising: The model construction module is used for constructing a three-dimensional digital twin model for representing fracture space distribution and seepage characteristics based on multi-scale geological survey data of the spontaneous combustion area of the coal seam; the dividing module is used for dynamically dividing the burnt rock aquifer into three functional units of a high-speed channel area, a detention area and a heat insulation area according to the spatial variation characteristics of the permeability in the three-dimensional digital twin model; The differential heat injection regulation and control module is used for executing differential injection regulation and control based on real-time calculation of the three-dimensional digital twin model in summer heat storage period, updating thermophysical parameters of different functional units through fusion of real-time monitoring data in a dynamic inversion mode, solving an optimal heat injection distribution strategy, and generating differential heat injection instructions for the functional units, wherein the real-time monitoring data comprise wellhead temperature, wellhead flow and wellhead pressure; the cooperative heat extraction regulation and control module is used for executing gradient extraction and reverse cold impact cooperative regulation and control in winter heat extraction period, extracting heat from the high-speed channel region and the detention region in a grading manner, and injecting reverse cold water into the periphery of the heat storage core sub-region in the detention region so as to drive the heat to directionally migrate to a water extraction well.

Description

Scheduling method and system for summer Chu Dong of metamorphic aquifer Technical Field The invention belongs to the technical field of computer-aided optimization scheduling, and particularly relates to a scheduling method and system for a summer Chu Dong of a metamorphic aquifer. Background The burnt rock is a special rock formed by the change of color, composition, structure and structure of surrounding rock caused by spontaneous combustion and baking of organic matters such as coal beds, and the burnt rock is developed due to cracks and pores, so that good space is provided for underground water runoff and storage, and the burnt rock, together with a loose bed and a weathered bedrock aquifer, is often used as a main aquifer of a mining area. In the related art, an Aquifer Thermal Energy Storage (ATES) system is built on aquifers such as homogeneous or weak heterogeneous sandstone, limestone and the like, a symmetrical double-well pumping-filling mode is adopted, seasonal heat storage-heat extraction is realized depending on the overall uniformity of the aquifer, however, a burnt rock aquifer formed by spontaneous combustion of a coal seam presents extremely strong spatial heterogeneity, namely, permeability coefficient is jumped by 2-4 orders of magnitude in a plane and vertical direction, a fracture network is in directional communication mutation, hot water in a heat storage stage flows rapidly, a local thermal short circuit is formed in a heat extraction stage, the heat recovery rate is generally lower than 50% and is far lower than the level of 70-90% of a conventional ATES system, and in addition, the existing scheduling method presents the problems of heat storage efficiency attenuation, system availability reduction and the like under the burnt rock condition. Disclosure of Invention The embodiment of the invention aims to provide a scheduling method and a scheduling system for a summer Chu Dong of a burnt rock aquifer, which aim to solve at least one problem of low heat recovery rate, low heat storage efficiency, low system availability and the like of the burnt rock aquifer in the background art. The embodiment of the invention is realized in such a way that, on one hand, the scheduling method for the summer Chu Dong of the burnt rock aquifer comprises the following steps: constructing a three-dimensional digital twin model for representing fracture space distribution and seepage characteristics based on multi-scale geological survey data of a coal seam spontaneous combustion area; Dynamically dividing the burnt rock aquifer into three functional units, namely a high-speed channel region, a detention region and a heat insulation region according to the spatial variation characteristics of permeability in the three-dimensional digital twin model; Performing differential injection regulation and control based on real-time calculation of the three-dimensional digital twin model in a summer heat storage period, updating thermophysical parameters of different functional units through dynamic inversion by fusing real-time monitoring data, solving an optimal heat injection distribution strategy, and generating differential heat injection instructions for the functional units, wherein the real-time monitoring data comprise wellhead temperature, wellhead flow and wellhead pressure; And performing gradient extraction and reverse cold impact cooperative regulation and control in a heat extraction period in winter, extracting heat from the high-speed channel region and the detention region in a grading manner, and injecting reverse cold water into the periphery of a heat storage core sub-region in the detention region so as to drive the heat to directionally migrate to a water extraction well. As a further aspect of the present invention, there is provided a scheduling system for summer Chu Dong of a metamorphic aquifer, comprising: The model construction module is used for constructing a three-dimensional digital twin model for representing fracture space distribution and seepage characteristics based on multi-scale geological survey data of the spontaneous combustion area of the coal seam; the dividing module is used for dynamically dividing the burnt rock aquifer into three functional units of a high-speed channel area, a detention area and a heat insulation area according to the spatial variation characteristics of the permeability in the three-dimensional digital twin model; The differential heat injection regulation and control module is used for executing differential injection regulation and control based on real-time calculation of the three-dimensional digital twin model in summer heat storage period, updating thermophysical parameters of different functional units through fusion of real-time monitoring data in a dynamic inversion mode, solving an optimal heat injection distribution strategy, and generating differential heat injection instructions for the functional units, wherein the real-time m