CN109726371B - Establishment method and application method of water temperature and volume analysis chart for hydrothermal geothermal wells - Google Patents
Establishment method and application method of water temperature and volume analysis chart for hydrothermal geothermal wells Download PDFInfo
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Abstract
本发明提出了一种水热型地热井水温水量分析图版的建立方法及应用方法。建立方法包括以下步骤：建立二维直角坐标系，横坐标表示探井水温变化量，纵坐标表示探井产水量变化量；基于研究区多个地热田探井的水温数据与水量数据，在所述二维直角坐标系中形成水温水量散点图；在所述二维直角坐标系内分别画出不同级别的等热量曲线；基于所述等热量曲线把所述二维直角坐标系分成不同区域。该图版可以广泛应用于地热田勘探评价过程中，方便快捷的对地热田勘探开发潜力取得认识，节省人力物力资源。本发明提高了地热田探井水温水量提供热能级别评价的快捷性与科学性，使评价结果更具有参考价值。
The invention proposes a method for establishing and applying a hydrothermal geothermal well water temperature and volume analysis chart. The establishment method includes the following steps: establish a two-dimensional rectangular coordinate system, the abscissa represents the change in water temperature of the exploration well, and the ordinate represents the change in water production of the exploration well; based on the water temperature data and water volume data of multiple geothermal field exploration wells in the study area, in the two-dimensional A scatter plot of water temperature and water volume is formed in the rectangular coordinate system; isocaloric curves of different levels are drawn in the two-dimensional rectangular coordinate system; and the two-dimensional rectangular coordinate system is divided into different regions based on the isocaloric curve. This chart can be widely used in the process of geothermal field exploration and evaluation to quickly and conveniently gain understanding of the geothermal field exploration and development potential and save manpower and material resources. The invention improves the speed and scientificity of evaluating the thermal energy level provided by the temperature and volume of water in geothermal fields, making the evaluation results more valuable as a reference.
Description
Technical Field
The invention belongs to the field of geothermal geology, and particularly relates to a geothermal energy level discrimination model for water temperature and water yield of a water-heating geothermal Tian Dere well, namely establishment and application of a water temperature and water yield analysis chart of the water-heating geothermal well.
Background
At present, domestic hydrothermal geothermal resources are rapidly developed as clean heating energy sources, but the water temperature and water volume interval distribution range of geothermal Tian Tanjing lacks a general and effective dividing and comparing tool, the water temperature is generally calculated according to the geothermal gradient of the construction position of a exploratory well, the water volume is estimated according to parameters such as the porosity, the permeability, the crack development degree and the like of a thermal reservoir, the geothermal water temperature and water volume is more influenced by complex geothermal geological structures, the water temperature and water volume values which do not accord with the predicted geothermal gradient and the porosity permeability are required to be analyzed, whether the water temperature and water volume of the exploratory well belong to a normal use range or not is not rapidly judged, the geothermal potential level which can be provided by the geothermal well is required to be judged again, and the exploratory wells of the geothermal fields of different construction units cannot form a unified geothermal energy level concept due to the fact that the geothermal gradient of the different construction units is different, the porosity permeability and the crack development condition are different.
Disclosure of Invention
The invention aims to solve the problem of classification judgment of the distribution interval of the water temperature and the water quantity of the geothermal heat Tian Tanjing in the prior art, namely the geothermal well provides geothermal energy level division and analysis of the contribution value of the temperature and the water quantity under the same heat quantity.
Aiming at the problems in the prior art, the invention provides a method for establishing a geothermal field exploratory well water temperature and water volume analysis chart and application thereof.
In order to achieve the above purpose, the invention provides a method for establishing a water-heat type geothermal well water-warm water quantity analysis plate, which comprises the following steps:
establishing a two-dimensional rectangular coordinate system, wherein the abscissa represents the water temperature variation of the exploratory well, and the ordinate represents the water yield variation of the exploratory well;
forming a water temperature and water volume scatter diagram in the two-dimensional rectangular coordinate system based on water temperature data and water volume data of a plurality of geothermal field exploratory wells in a research area;
respectively drawing different levels of isocaloric curves in the two-dimensional rectangular coordinate system;
dividing the two-dimensional rectangular coordinate system into different areas based on the isocaloric curve.
Further, the abscissa of the two-dimensional rectangular coordinate system represents the water temperature variation of the exploratory well, and the water temperature variation is in degrees centigrade; and the ordinate of the two-dimensional rectangular coordinate system represents the water yield variation of the exploratory well and takes cubic meters per hour as a unit.
Further, a diagonal line is formed in the two-dimensional rectangular coordinate system, geothermal wells with the same geothermal energy level are arranged, the contribution of water quantity of the geothermal well positioned at the left upper part of the diagonal line to the thermal energy is larger than that of the geothermal well positioned at the right lower part of the diagonal line, and the contribution of water temperature provided by the geothermal well positioned at the right lower part of the diagonal line to the geothermal energy is larger than that of the geothermal well positioned at the left upper part of the diagonal line.
Further, judging the geothermal energy utilization level of the exploratory well or the geothermal energy productivity level of the unerrigated geothermal well according to the water temperature and water quantity analysis plate, and analyzing the contribution of the water temperature and water quantity to the geothermal energy.
Further, projecting the water temperature and water volume analysis plate with the water temperature and water volume analysis plate to analyze the geothermal energy utilization level and the contribution of water temperature and water volume according to the projection points falling in different areas of the water temperature and water volume analysis plate
Further, the different areas are divided into an area I, an area II, an area III, an area IV and an area V according to the heat quantity from large to small, geothermal energy with different magnitudes is provided by geothermal wells projected to the different areas, and geothermal wells projected to the same areas have the same range of geothermal energy.
Further, a fixed tail water temperature value is adopted, and the tail water temperature value is divided into a plurality of classification areas from large to small according to geothermal energy.
Further, according to the change of the water temperatures and the water quantities of different geothermal wells in the two-dimensional rectangular coordinate system, a plurality of combinations of the water temperatures and the water quantities which can provide the same heat quantity value are calculated, and an equal heat curve with different levels is generated.
Further, when the same geothermal energy is supplied, the higher the geothermal water temperature, the smaller the required amount of water, whereas the lower the geothermal water temperature, the larger the required amount of water.
Based on a geothermal Tian Tanjing water temperature and water yield change scatter diagram, the water temperature and water yield change data of a plurality of geothermal field exploratory wells are put into a two-dimensional rectangular coordinate system, and the water temperature and water yield changes of a plurality of hydrothermal geothermal type Tian Tanjing are classified according to provided heat energy values.
The geothermal Tian Tanjing water temperature and water quantity change plate can be divided into a plurality of classification areas from large to small according to geothermal energy when a fixed tail water temperature value is adopted, and can be divided into a plurality of classification area plates from large to small according to different tail water temperature values when different tail water temperature values are changed. The plate is concise and brief to express the interval and meaning of the water temperature and water quantity change of the exploratory well in the exploration process of different water-heat type geothermal fields. The plate can not only rapidly analyze the geothermal energy level provided by each geothermal heat Tian Tanjing due to the change of water temperature and water quantity, but also qualitatively evaluate the geothermal energy level of the geothermal field represented by the exploratory well. The plate can be widely applied to the field exploration and evaluation process, and can conveniently and quickly acquire knowledge of the field exploration and development potential, and save manpower and material resources.
The invention improves the rapidness and scientificity of the geothermal Tian Tanjing water temperature and water quantity for providing the heat energy level evaluation, so that the evaluation result has a reference value.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout exemplary embodiments of the disclosure.
FIG. 1 is a schematic diagram of the variation of water temperature and water quantity of a geothermal well according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a geothermal well water temperature and water volume analysis plate and application of the present invention.
FIG. 3 is a flow chart of a method for establishing a water-warm water quantity analysis plate of a water-heat geothermal well.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention discloses a method for establishing a water-heating type geothermal well water-warm water quantity analysis plate and application thereof, which are mainly characterized in that: based on the existing exploratory well water testing temperature and water yield relation scatter diagram of the geothermal field, the water testing temperature and water yield data of a plurality of geothermal heat Tian Tanjing in the research area are cast into a two-dimensional rectangular coordinate system. According to the temperature change and the different water yield changes in the coordinate system, the water temperature and the water yield are partitioned by taking the same geothermal energy potential as a standard, and each partition has the same geothermal energy potential. And making a diagonal line along the water temperature and water quantity diagram in the coordinate system, wherein the geothermal wells with the same geothermal energy level are positioned at the upper left of the diagonal line, the water quantity contribution of the geothermal well is larger than the temperature contribution, and the water temperature contribution provided at the lower right of the diagonal line is larger than the water quantity contribution. The new exploratory well can rapidly judge the geothermal energy utilization level of the exploratory well according to the water temperature and water quantity plate, or rapidly judge the geothermal energy productivity level of the undrilled geothermal well.
Specifically, the disclosure provides a method for establishing a water-heat type geothermal well water-warm water quantity analysis chart, which comprises the following steps:
establishing a two-dimensional rectangular coordinate system, wherein the abscissa represents the water temperature variation of the exploratory well, and the ordinate represents the water yield variation of the exploratory well;
forming a water temperature and water volume scatter diagram in the two-dimensional rectangular coordinate system based on water temperature data and water volume data of a plurality of geothermal field exploratory wells in a research area;
respectively drawing different levels of isocaloric curves in the two-dimensional rectangular coordinate system;
dividing the two-dimensional rectangular coordinate system into different areas based on the isocaloric curve.
Firstly, a two-dimensional rectangular coordinate system is established, wherein the abscissa of the two-dimensional rectangular coordinate system represents the water temperature variation of the exploratory well, the water yield variation of the exploratory well is represented by taking the celsius degree as a unit, and the ordinate of the two-dimensional rectangular coordinate system represents the water yield variation of the exploratory well in units of cubic meters per hour.
Preferably, the water temperature and water quantity data can be calibrated through a exploratory well water test work. Based on the data of the water temperature and the water quantity of a plurality of geothermal tests Tian Tanjing of the research area, the data are cast into a coordinate system to form a water temperature and water quantity scatter diagram.
Next, according to the change of the water temperature and the water quantity of different geothermal wells in the two-dimensional rectangular coordinate system, taking the temperature of tail water after geothermal water utilization as 25 ℃ as an example, calculating a plurality of combinations of different water temperatures and water quantities which can provide the same heat quantity value, and respectively drawing different levels of isothermal curves in the coordinate system.
The two-dimensional rectangular coordinate system is divided into different areas by using the isocaloric curves. For example, the heat can be divided into a zone I, a zone II, a zone III, a zone IV, a zone V and the like according to the heat quantity from large to small, and the geothermal wells projected to different zones can provide geothermal energy with different magnitudes. Geothermal wells projected in the same zone have a roughly considerable range of geothermal energy.
Preferably, a diagonal line is formed along the water temperature and water volume map in a two-dimensional rectangular coordinate system, geothermal wells with the same geothermal energy level are arranged, the water volume of the geothermal well positioned at the left upper part of the diagonal line has a larger contribution to heat energy than the temperature, and the water temperature provided by the geothermal well positioned at the right lower part of the diagonal line has a larger contribution to geothermal energy than the water volume.
Preferably, the hydrothermal geothermal wells are classified by the amount of available geothermal energy, and when the same geothermal energy is provided, the higher the geothermal water temperature, the smaller the amount of water needed, whereas the lower the geothermal water temperature, the larger the amount of water needed.
According to another aspect of the present invention, there is provided an application method of a water temperature and water volume analysis plate for a hydrothermal type geothermal well, comprising the steps of:
projecting the water temperature and water quantity analysis plate of the exploratory well to be judged and the water test temperature or estimated temperature and the water test quantity or estimated water quantity value;
and analyzing the geothermal energy utilization level and the water temperature and water volume contribution according to the different areas of the water temperature and water volume analysis plate where the projection points fall.
Aiming at the newly drilled well, the geothermal energy utilization level of the exploratory well can be rapidly judged according to the water temperature and water quantity analysis plate, or the geothermal energy productivity level of the undrilled geothermal well can be rapidly predicted, and the contribution of the water temperature and water quantity to the geothermal energy can be analyzed.
In order to facilitate understanding of the solution and the effects of the embodiments of the present invention, a specific application example is given below. It will be understood by those of ordinary skill in the art that the examples are for ease of understanding only and that any particular details thereof are not intended to limit the present invention in any way.
The present invention will be described in detail below with reference to the drawings and examples.
The invention provides a method for establishing a geothermal field exploratory well water temperature and water yield analysis chart and application thereof. The method for establishing the geothermal Tian Tanjing water temperature and water quantity analysis plate comprises the following steps of:
as shown in fig. 1, a two-dimensional rectangular coordinate system is established, wherein the abscissa thereof represents the water temperature variation of the exploratory well in degrees celsius, and the ordinate thereof represents the water yield variation of the exploratory well in cubic meters per hour.
And calibrating temperature and water yield data through water testing work of the exploratory well. Based on the water test temperature and water yield data of the geothermal field exploratory well in the research area, the water test temperature and water yield data of a plurality of geothermal heat Tian Tanjing in the research area are cast into a coordinate system to form a scatter diagram (shown by dots in fig. 1).
According to the distribution condition of the water temperature and the water quantity of the existing exploratory well in the figure and the actual tail water temperature condition after the geothermal water is utilized in the research area, the geothermal energy lines are calculated and drawn, and the tail water temperature is 25 ℃ in the embodiment.
According to the heat calculation formula, the geothermal well provides the following heat energy:
Q＝cρV(T-T 0 )/3600
c-specific heat of geothermal well water in coke per kilogram of degrees centigrade (J/(kg x ℃)), taking average 4187J/(kg x ℃);
ρ -geothermal water density in kilograms per cubic meter (kg/m) 3 ) Average 1000kg/m 3 ；
V-volume of geothermal water produced per hour in cubic meters (m 3 /h)；
T-the temperature of the produced water of the geothermal well in degrees centigrade (DEG C);
T 0 -geothermal well utilizing tail water temperature in degrees centigrade (deg.c) and taking average value of 25 deg.c;
respectively take Q 1 、Q 2 、Q 3 、Q 4 The geothermal well water temperature T was calculated and the geothermal energy lines were plotted (as shown in fig. 2) for 2000kw,4000kw,6000kw, and 8000kw, respectively, with respect to the water volume V.
In this embodiment, according to the difference of the temperature change of the exploratory well and the water volume change in the two-dimensional rectangular coordinate system, several points can be quickly recognized:
(1) The potential of geothermal energy provided by the exploratory well A is greater than that provided by the exploratory well B and the exploratory well C, and the potential of geothermal energy provided by the exploratory well B and the exploratory well C is greater than that provided by the exploratory well D and the exploratory well E;
(2) Although the exploratory well B and the exploratory well C have the geothermal energy potential interval (the geothermal energy in the zone IV is 2000-4000 kw), the geothermal energy water temperature contribution provided by the exploratory well B is larger than the water temperature contribution, and the geothermal energy water temperature contribution provided by the exploratory well C is larger than the water temperature contribution;
(3) The potential of geothermal energy provided by the exploratory well D and the exploratory well E cannot reach the available standard (the geothermal energy in the V region is less than 2000 kw), and the main reason is that the water temperature provided by the exploratory well D is low and the water quantity provided by the exploratory well E is low.
The above embodiments are only used for illustrating the present invention, wherein the variable names and units in the plate, the tail water temperature value, the partition line positions and the partition division can be changed according to specific data or research purposes, and all equivalent changes and improvements performed on the basis of the technical scheme of the present invention are within the protection scope of the present invention.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The method for establishing the water-heating type geothermal well water-warm water quantity analysis plate is characterized by comprising the following steps of:
establishing a two-dimensional rectangular coordinate system, wherein the abscissa represents the water temperature variation of the exploratory well, and the ordinate represents the water yield variation of the exploratory well;
forming a water temperature and water volume scatter diagram in the two-dimensional rectangular coordinate system based on water temperature data and water volume data of a plurality of geothermal field exploratory wells in a research area;
respectively drawing different levels of isocaloric curves in the two-dimensional rectangular coordinate system;
dividing the two-dimensional rectangular coordinate system into different areas based on the isocaloric curve;
according to the distribution condition of the water temperature and water quantity of the existing exploratory well in the figure and the actual tail water temperature condition after the geothermal water in the research area is utilized, calculating and drawing the geothermal energy lines, according to a thermal calculation formula, the geothermal energy provided by the geothermal well has the following capabilities:
Q＝cρV(T-T 0 )/3600
c, specific heat of geothermal well water, wherein the unit is coke per kilogram of heat;
ρ—geothermal water density in kilograms per cubic meter;
v-the volume of geothermal water produced per hour in cubic meters;
t-the temperature of produced water of the geothermal well, wherein the unit is the temperature;
T 0 -geothermal well utilizing tail water temperature in degrees celsius;
and taking a plurality of Q values, respectively calculating the relation between the water temperature T and the water quantity V of the geothermal well, and drawing an equivalent geothermal energy line.
2. The method for creating the water-warm water quantity analysis chart of the hydrothermal geothermal well according to claim 1, wherein a diagonal line is made in the two-dimensional rectangular coordinate system, geothermal wells with the same geothermal energy level are located in the geothermal well at the upper left of the diagonal line, the water quantity of the geothermal well is greater than the heat energy contribution of temperature, and the water temperature provided by the geothermal well at the lower right of the diagonal line is greater than the water quantity contribution.
3. The method for creating the water-warm water quantity analysis plate for the hydrothermal geothermal well according to claim 1, wherein the different areas are divided into an area i, an area ii, an area iii, an area IV and an area V according to the geothermal energy from large to small, the geothermal wells projected to the different areas provide geothermal energy of different magnitudes, and the geothermal wells projected to the same area have geothermal energy of the same range.
4. The method for establishing the water-warm water quantity analysis chart of the hydrothermal geothermal well according to claim 1, wherein a plurality of combinations of different water temperatures and water quantities capable of providing the same heat quantity value are calculated according to the changes of the water temperatures and the water quantities of different geothermal wells in the two-dimensional rectangular coordinate system, so that different levels of isothermal curves are generated.
5. The method for creating a water-warm water analysis chart of a geothermal well according to claim 4, wherein the constant tail water temperature value is used and the geothermal well is divided into a plurality of classification areas from large to small.
6. The method for establishing the water-temperature water quantity analysis plate for the hydrothermal type geothermal well according to claim 1, wherein the geothermal energy utilization level of the exploratory well or the geothermal energy productivity level of the geothermal well which is not drilled is judged according to the water temperature water quantity analysis plate, and the contribution of the water temperature water quantity to the geothermal energy is analyzed.
7. The method for establishing the water-temperature water quantity analysis plate of the hydrothermal geothermal well according to claim 6, wherein the water temperature water quantity analysis plate is projected with the water temperature water quantity or the estimated temperature and the water temperature water quantity to be detected, and the geothermal energy utilization level and the water temperature water quantity contribution are analyzed according to the fact that the projection points fall in different areas of the water temperature water quantity analysis plate.
8. The method for creating a plate for water-warm water analysis of a geothermal well according to claim 1, wherein the abscissa is in degrees celsius and the ordinate is in cubic meters per hour.
9. The method of setting up a water-warm water amount analysis chart of a geothermal well according to claim 1, wherein when the same geothermal energy is supplied, the higher the geothermal water temperature is, the smaller the required water amount is, whereas the lower the geothermal water temperature is, the larger the required water amount is.
10. The application method of the water-heating type geothermal well water-warm water quantity analysis plate is characterized by comprising the following steps of:
projecting the trial water temperature or estimated temperature and trial water amount or estimated water amount value of the exploratory well to be judged to the water temperature and water amount analysis plate established by the establishment method of the water temperature and water amount analysis plate of the hydrothermal geothermal well according to any one of claims 1 to 9;
and analyzing the geothermal energy utilization level and the water temperature and water volume contribution according to the different areas of the water temperature and water volume analysis plate where the projection points fall.
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