CN112036027A - Method for calculating volume of dischargeable brine in sediment gap of salt cavern gas storage - Google Patents
Method for calculating volume of dischargeable brine in sediment gap of salt cavern gas storage Download PDFInfo
- Publication number
- CN112036027A CN112036027A CN202010883507.1A CN202010883507A CN112036027A CN 112036027 A CN112036027 A CN 112036027A CN 202010883507 A CN202010883507 A CN 202010883507A CN 112036027 A CN112036027 A CN 112036027A
- Authority
- CN
- China
- Prior art keywords
- volume
- sediment
- salt
- brine
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013049 sediment Substances 0.000 title claims abstract description 145
- 150000003839 salts Chemical class 0.000 title claims abstract description 139
- 239000012267 brine Substances 0.000 title claims abstract description 75
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000008961 swelling Effects 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 235000002639 sodium chloride Nutrition 0.000 claims description 143
- 238000004364 calculation method Methods 0.000 claims description 24
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 238000009825 accumulation Methods 0.000 claims description 16
- 239000011780 sodium chloride Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 7
- 239000011435 rock Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 36
- 239000007789 gas Substances 0.000 description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention relates to the technical field of oil and gas resource underground exploration, in particular to a method for calculating the volume of dischargeable brine in sediment gaps of a salt cavern gas storage. The method comprises the following steps: manufacturing a sediment sample in a target salt layer; obtaining the expansion coefficient of the sediment sample; acquiring the crushing and swelling coefficient of the sediment sample; acquiring the water holding coefficient of the sediment sample; calculating the volume of dischargeable water of the target salt layer. According to the invention, the sediment sample in the target salt layer is utilized to obtain the expansion coefficient, the crushing coefficient and the water holding coefficient which are used for representing the actual physical state of the sediment in the target salt layer, and then the underground dissolving cavity at the target salt layer is accurately modeled by combining the relevant field parameters in the process of dissolving the water in the salt cavity to construct the cavity, so that the volume of brine discharged from the sediment gap of the high-impurity salt cavern gas storage is accurately calculated.
Description
Technical Field
The invention relates to the technical field of oil and gas resource underground exploration, in particular to a method for calculating the volume of dischargeable brine in sediment gaps of a salt cavern gas storage.
Background
The underground cavity formed by dissolving salt rock in water is an internationally recognized excellent place for storing natural gas on a large scale. Because most of salt rocks in China are formed by lake Hunan deposition, the salt deposit has the characteristics of thin thickness of a salt layer, more interlayers, high content of insoluble substances and the like, a dissolving cavity formed by water dissolution accumulates a large amount of insoluble substances at the cavity bottom of a gas storage to form insoluble substance accumulation bodies (namely 'sediments'), and the sediment accumulation bodies occupy more space of the dissolving cavity. The traditional gas storage is that the pressure of injecting natural gas is utilized to press brine in the upper space of the salt cavity to the ground surface, and the upper brine space is utilized to store gas. However, in the high impurity salt cavern, a large amount of sediment occupies a large amount of gas storage space, so that the available gas storage space at the upper part of the gas storage is small, and the storage capacity of the gas storage is small. Sediment gap brine is discharged by using sediment gas storage technology, and a part of sediment gaps are used for gas storage, so that the gas storage space can be effectively enlarged, and the storage capacity of the gas storage is increased.
At present, the sediment gap gas storage of the salt cavern gas storage is utilized, no engineering precedent exists at home and abroad, and the method belongs to a new technical field. On-site experiments and sonar measurement cavities find that sediments have high porosity and good connectivity in high-impurity salt cavern gas storage, and a method for displacing sediments, namely, brine in the gaps of the sediments by using natural gas is feasible. However, there is no relevant evaluation standard for the volume of the sediment air-storage body (namely, the volume of the sediment air-storage body capable of discharging brine) in the sediment air gap, and a scheme capable of accurately obtaining the volume of the brine discharging in the sediment air-storage body with high impurity salt cavern is urgently needed.
Disclosure of Invention
The invention aims to provide a method for calculating the volume of brine dischargeable in sediment gaps of a salt cavern gas storage, so as to accurately calculate the volume of brine dischargeable in sediment gaps of a high-impurity salt cavern gas storage.
In order to achieve the above object, an embodiment of the present invention provides a method for calculating volume of dischargeable brine in sediment voids of a salt cavern gas storage, including:
manufacturing a sediment sample in a target salt layer;
obtaining the expansion coefficient d of the sediment sample;
acquiring a crushing and swelling coefficient b of the sediment sample;
acquiring a water holding coefficient w of the sediment sample;
calculating the volume V of dischargeable brine of the target salt layerkThe specific calculation formula is as follows:
the method comprises the following steps of obtaining a target salt layer, obtaining a total mass of extracted rock salt in the process of water-soluble cavity construction of the target salt layer in a salt cavity, and obtaining a brine average salt concentration in the process of water-soluble cavity construction of the target salt layer in the salt cavity.
In one possible embodiment, the making the sediment sample in the target salt layer comprises:
obtaining a rock core sample of the target salt layer through field drilling;
soaking the core sample in water to dissolve soluble rock salt in the core sample and obtain sediment-free materials;
and drying the sediment non-accumulation object at a first set temperature for a first set time to obtain a sediment sample.
In a possible embodiment, the obtaining the expansion coefficient d of the sediment sample comprises:
loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0；
Adding a sodium chloride solution with a set concentration into the measuring cylinder, standing the measuring cylinder at a second set temperature for a second set time, and reading an expansion volume V of the sediment sample after the sediment sample is stably expanded in the measuring cylinder;
and (3) calculating the expansion coefficient d of the sediment, wherein the specific calculation formula is as follows:
in a possible embodiment, the obtaining the crushing coefficient b of the sediment sample comprises:
loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0；
And (3) calculating the crushing and swelling coefficient b of the sediment sample, wherein the specific calculation formula is as follows:
wherein M is0Is the mass of the sediment sample, p0Is the density of the sediment sample.
In a possible embodiment, the obtaining the water holding coefficient w of the sediment sample comprises:
loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0；
Adding V into the measuring cylinder1A volume of water such that a liquid level in the graduated cylinder is level with a highest position of the sediment sample in the graduated cylinder;
discharging the water in the measuring cylinder from a bottom water discharge hole of the measuring cylinder, and recording the volume V of the discharged water2；
And calculating the water holding coefficient w of the sediment sample, wherein the specific calculation formula is as follows:
in a possible embodimentIn the embodiment, the dischargeable brine volume V of the target salt layer is calculatedkThereafter, the method further comprises:
measuring the measurement volume of the brine space at the upper part of the sediment after the water dissolution and construction of the cavity of the salt cavity of the target salt layer by utilizing a sonar technology;
calculating an exhaustible brine inspection volume according to the measured volume of the brine space;
determining whether a difference between the volume of exhaustible water and the inspected volume of exhaustible water is less than a set threshold;
if so, determining that the volume of the dischargeable brine is the volume of the dischargeable brine of the target salt layer after the salt cavity is water-dissolved in the salt cavity.
In one possible embodiment, the calculating an exhaustible brine test volume from the volume of the brine space includes:
calculating dischargeable brine inspection volume V'kThe specific calculation formula is as follows:
wherein, V'bIs the measured volume of the brine space.
In a possible embodiment, the first set temperature ranges from 100 degrees celsius to 110 degrees celsius, and the first set time period ranges from 40 hours to 60 hours.
In a possible embodiment, the second set temperature ranges from 30 degrees celsius to 50 degrees celsius, and the first set time period ranges from 25 days to 35 days.
In a possible embodiment, the method for calculating the set threshold includes:
calculating the set threshold value delta, wherein a specific calculation formula is as follows:
Δ＝k·Vk；
wherein k is a set ratio value.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the sediment sample in the target salt layer is utilized to obtain the expansion coefficient, the crushing coefficient and the water holding coefficient which are used for representing the actual physical state of the sediment in the target salt layer, and then the underground dissolving cavity at the target salt layer is accurately modeled by combining the relevant field parameters in the process of water dissolving and cavity building of the salt cavity, so that the volume of brine discharged from the sediment gap of the high-impurity salt cavern gas storage is accurately calculated.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used 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 specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic representation of a model of a subsurface cavern at a target salt formation provided by an embodiment of the invention;
fig. 2 is a flowchart of a method for calculating volume of dischargeable brine in sediment voids of a salt cavern gas storage according to an embodiment of the present invention.
Description of reference numerals: 1 is the total volume of underground dissolving cavity, 2 is the soluble salt volume in the underground dissolving cavity, 3 is the sediment volume before the inflation in the underground dissolving cavity, 4 is the total volume of ground extraction salt, 5 is the volume of soluble salt in the brine in the underground dissolving cavity, 6 is the volume of the brine space on sediment upper portion in the underground dissolving cavity, and 7 is the sediment volume after the inflation in the underground dissolving cavity.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
The invention firstly models the underground cavern of the target salt layer before and after the salt cavern water-soluble construction cavity, and as shown in fig. 1, the invention provides a model schematic diagram of the underground cavern at the target salt layer, wherein each ellipse represents the same volume.
The underground cavern is an underground cavity which contains soluble salt and insoluble sediment and has a fixed volume, so that the total volume of the underground cavern does not change no matter how the soluble salt and the insoluble sediment change.
Before the water dissolution of the salt cavity is carried out, the substances in the underground cavity can be simply divided into soluble salt and insoluble sediment, so that the total volume V of the underground cavitytCan be simplified into the volume V of soluble salt in the underground dissolving cavitysAnd volume of sludge before expansion VcExpressed by the formula: vt＝Vs+Vc。
Wherein the volume of soluble salt VsAnd volume of sludge before expansion VcIs distributed in the target salt layer in a uniform proportion, so that the volume V of the sediment before expansion can be calculated according to the content a of the insoluble substancecExpressed by the formula: vc＝Vt×a。
In the process of water dissolving and cavity building of the salt cavity, as a large amount of water is injected into the underground dissolving cavity, all soluble salt in the underground dissolving cavity is dissolved to form brine, and then part of the brine is discharged out of the ground by newly injected natural gas, so that the volume V of the soluble salt in the underground dissolving cavity is at the momentsTotal volume V of salt extracted from the grounds1And volume V of soluble salt in brine in underground caverns2The two parts are formed, and the formula is used for expression: vs＝Vs1+Vs2. Wherein, according to the total volume V of the salt extracted from the grounds1The total mass M of the ground and the density rho of the solid salt in the target rock stratum can be obtained by calculation, and the formula is expressed as follows:
after the salt cavity is dissolved in water to construct the cavity, the salt cavity can be dissolved in waterSimply dividing the volume of the space in the underground dissolving cavity into the volume V of the brine space at the upper part of the sediment in the underground dissolving cavitybAnd the volume V of the expanded sedimentnExpressed by the formula: vt＝Vb+Vn. Then, the volume V of the soluble salt in the brine in the underground cavity can be represented by using the average salt concentration of the extracted brine in the process of dissolving the cavity in the salt cavity by using the target salt layer and the physical quantities such as the volume occupied by the current brine in the underground cavitys2Expressed by the formula:
wherein, b is the crushing and swelling coefficient of the sediment, and d is the expansion coefficient of the sediment.
From the above formula, one can deduce:
by using the volume V of soluble salt in underground cavitysTotal volume V of surface produced salts1And volume V of soluble salt in brine in underground caverns2The relationship between them, one can deduce:
volume V of dischargeable brine according to target salt layerkVolume V of the expanded sedimentnAnd the relation before the water holding coefficient w, it can be deduced that:
in the calculation formula, the content a of insoluble substances in a target salt layer, the density rho of solid salt in the target salt layer, the total mass M of extracted rock salt of the target salt layer in the cavity water-soluble construction process of a salt cavity and the average salt concentration c of extracted brine of the target salt layer in the cavity water-soluble construction process of the salt cavity are field parameters which can be directly obtained from the field, and the expansion coefficient d, the crushing coefficient b and the water holding coefficient w cannot be directly obtained from the field and need to be measured in a laboratory.
Therefore, the embodiment provides a method for calculating the volume of the dischargeable water in the sediment gap of the salt cavern gas storage, so as to calculate the volume of the dischargeable water through the formula. Referring to fig. 1, fig. 1 is a flowchart of an embodiment of the method, which specifically includes:
and 11, manufacturing a sediment sample in the target salt layer.
Here, the present invention also provides a preferable manufacturing scheme of the sediment sample, which specifically comprises:
and 21, obtaining a rock core sample of the target salt layer through field drilling.
And step 22, soaking the core sample in water to dissolve soluble rock salt in the core sample and obtain sediment.
Specifically, the soluble rock salt is some soluble mineral salts such as sodium chloride and sodium sulfate, and the insoluble sediment particles are obtained by soaking a core obtained on site in clear water and periodically replacing the soaked brine to fully dissolve the soluble mineral salts in the sample.
And 23, drying the sediment non-accumulation object at a first set temperature for a first set time to obtain a sediment sample.
Specifically, the first set temperature ranges from 100 ℃ to 110 ℃, and the first set time period ranges from 40 hours to 60 hours.
And step 12, obtaining the expansion coefficient d of the sediment sample.
Here, the present invention further provides a better scheme for obtaining the expansion coefficient, specifically:
step 31, loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0。
Specifically, a volume of sediment sample can be poured into a 250ml measuring cylinder, and the free bulk volume of the dry sample in the measuring cylinder can be read.
And 32, adding a sodium chloride solution with a set concentration into the measuring cylinder, standing the measuring cylinder at a second set temperature for a second set time, and reading the expansion volume V of the sediment sample after the sediment sample is stably expanded in the measuring cylinder.
Specifically, a saturated sodium chloride solution can be added to simulate a solution cavity brine environment, then the measuring cylinder is placed in an incubator with a second set temperature for a second set time, and the volume of the insoluble substances after stable expansion is read.
Specifically, the second set temperature ranges from 30 ℃ to 50 ℃, and the first set time period ranges from 25 days to 35 days.
Step 33, calculating the expansion coefficient d of the sediment, wherein the specific calculation formula is as follows:
and step 13, obtaining the crushing and swelling coefficient b of the sediment sample.
Here, the present invention further provides a better acquiring scheme of the breaking expansion coefficient, which specifically comprises:
step 41, loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0。
And 42, calculating the crushing and swelling coefficient b of the sediment sample, wherein the specific calculation formula is as follows:
wherein M is0Is the mass of the sediment sample, p0Is the density of the sediment sample.
In particular, an electronic balance may be used to directly weigh the sediment sample.
And step 14, acquiring the water holding coefficient w of the sediment sample.
Here, the present invention further provides a better water retention coefficient obtaining scheme, specifically:
step 51, loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0。
Step 52, adding V to the measuring cylinder1A volume of water such that the liquid level in the graduated cylinder is level with the highest position of the sediment sample in the graduated cylinder.
Step 53, draining the water in the measuring cylinder from a bottom drain hole of the measuring cylinder, and recording the volume V of the drained water2。
Step 54, calculating the water holding coefficient w of the sediment sample, wherein the specific calculation formula is as follows:
step 15, calculating the volume V of dischargeable brine of the target salt layerkThe specific calculation formula is as follows:
wherein a is the content of insoluble substances in the target salt layer, rho is the density of solid salt in the target salt layer, M is the total mass of extracted rock salt of the target salt layer in the process of water-soluble cavity construction of the salt cavity, and c is the average salt concentration of extracted brine of the target salt layer in the process of water-soluble cavity construction of the salt cavity.
In a possible embodiment, in order to improve the calculation accuracy of the volume of the dischargeable water, the invention further provides the following scheme:
calculating the volume V of dischargeable brine of the target salt layerkThereafter, the method further comprises:
and 61, measuring the measurement volume of the brine space at the upper part of the sediment after the target salt layer is dissolved in the water in the salt cavity by using a sonar technology.
And step 62, calculating the dischargeable brine inspection volume according to the measured volume of the brine space.
Specifically, the calculation process includes:
step 71, calculating dischargeable brine inspection volume V'kThe specific calculation formula is as follows:
wherein, V'bIs the measured volume of the brine space.
And step 63, judging whether the difference value between the volume of the dischargeable water and the volume of the dischargeable water is smaller than a set threshold value.
Specifically, this embodiment is mutually supported through sonar measurement and the direct numerical calculation of model two kinds of modes, has improved the degree of accuracy that can arrange brine inspection volume.
Specifically, the method for calculating the set threshold includes:
step 81, calculating the set threshold Δ, wherein a specific calculation formula is as follows:
Δ＝k·Vk；
wherein k is a set ratio value.
And step 64, if so, determining the volume of the dischargeable water to be the volume of the dischargeable water after the target salt layer is dissolved in the salt cavity water.
Here, the present invention takes a high impurity salt cavern gas storage in huai' an area as an example to illustrate the scheme of calculating the volume of the dischargeable brine in this embodiment.
1. Obtaining salt deposit formation occurrence characteristics
The total salt production amount in the cavity building process of the salt cavern is 24 ten thousand tons, the salt concentration of the brine is 280g/l, the insoluble matter content of the salt exploitation rock stratum is 0.35, and the solid salt density is 2200kg/m3。
2. Obtaining sediment sample in indoor dissolution test
And (3) soaking the core obtained on site in clear water, and periodically replacing the soaked brine to fully dissolve soluble minerals (sodium chloride, sodium sulfate and the like) in the sample to obtain insoluble sediment particles. Drying the insoluble sediment particles for 48 hours in the temperature environment of 105 +/-5 ℃ to obtain sediment samples.
3. Indoor determination of expansion coefficient of insoluble particles in sediment
100ml of insoluble substance sample is measured by adopting a measuring cylinder and poured into the measuring cylinder with the specification of 250ml, saturated sodium chloride solution is added to simulate the brine environment of a dissolving cavity, the volume of the initial measuring cylinder is read to be 105ml, then the measuring cylinder is placed in a constant temperature box with the temperature of 40 ℃ for curing for 30h, the volume of the insoluble substance after stable expansion is read to be 110ml, and the expansion coefficient of the insoluble substance is calculated to be 1.0476.
4. Indoor determination of broken expansion coefficient of sediment
A certain volume of sediment sample is measured by adopting a measuring cylinder, poured into a measuring cylinder with the specification of 250ml, and the free accumulation volume of the dry sample in the measuring cylinder is read to be 110 ml. The same sample is placed on an electronic balance, and the mass M of the sample is measured0. And calculating to obtain the slag crushing and swelling coefficient of 1.6.
5. Indoor determination of water holding coefficient of sediment sample
A measuring cylinder is adopted to measure a certain volume of sediment sample, the sediment sample is placed in the measuring cylinder with a drain hole at the bottom, and the free accumulation volume of the dry sample in the measuring cylinder is recorded to be 120 ml. Adding water into the dry sample by using a measuring cylinder until the water surface is just level with the surface of the sediment, and recording the volume of the added water, namely 50 ml; after the water level stabilized, the drain hole in the bottom of the cylinder was opened and the water drained from the cylinder was collected and the volume of the drained water was recorded at 30ml until the water was no longer drained. And calculating to obtain the water holding coefficient of the sediment of 0.167.
6. Volume calculation of sediment dischargeable brine
Substituting the obtained related parameters into a formula
Calculated Vk9.65 ten thousand meters3That is, the volume of the brine discharged by the sediment is 9.65 ten thousand meters3。
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
in the embodiment of the invention, the sediment sample in the target salt layer is utilized to obtain the expansion coefficient, the crushing coefficient and the water holding coefficient which are used for representing the actual physical state of the sediment in the target salt layer, and then the underground dissolving cavity at the target salt layer is accurately modeled by combining the relevant field parameters in the process of dissolving the water in the salt cavity to construct the cavity, so that the volume of the brine which can be discharged from the sediment gap of the high-impurity salt cavern gas storage is accurately calculated.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for calculating volume of dischargeable brine in sediment gaps of a salt cavern gas storage is characterized by comprising the following steps:
manufacturing a sediment sample in a target salt layer;
obtaining the expansion coefficient d of the sediment sample;
acquiring a crushing and swelling coefficient b of the sediment sample;
acquiring a water holding coefficient w of the sediment sample;
calculating the volume V of dischargeable brine of the target salt layerkThe specific calculation formula is as follows:
wherein a is the content of insoluble substances in the target salt layer, rho is the density of solid salt in the target salt layer, M is the total mass of extracted rock salt of the target salt layer in the process of water-soluble cavity construction of the salt cavity, and c is the average salt concentration of extracted brine of the target salt layer in the process of water-soluble cavity construction of the salt cavity.
2. The method of calculating the volume of the dischargeable brine in the sediment void space of the salt cavern gas storage according to claim 1, wherein the step of preparing the sediment sample in the target salt layer comprises the following steps:
obtaining a rock core sample of the target salt layer through field drilling;
soaking the core sample in water to dissolve soluble rock salt in the core sample and obtain sediment-free materials;
and drying the sediment non-accumulation object at a first set temperature for a first set time to obtain a sediment sample.
3. The method of calculating the volume of exhaustible water in a sediment gap of a salt cavern gas storage according to claim 1, wherein the obtaining the expansion coefficient d of the sediment sample comprises:
loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0；
Adding a sodium chloride solution with a set concentration into the measuring cylinder, standing the measuring cylinder at a second set temperature for a second set time, and reading an expansion volume V of the sediment sample after the sediment sample is stably expanded in the measuring cylinder;
and (3) calculating the expansion coefficient d of the sediment, wherein the specific calculation formula is as follows:
4. the method of claim 1, wherein the obtaining the crush swell coefficient b of the sediment sample comprises:
loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0；
And (3) calculating the crushing and swelling coefficient b of the sediment sample, wherein the specific calculation formula is as follows:
wherein M is0Is the mass of the sediment sample, p0Is the density of the sediment sample.
5. The method of calculating the volume of water-carrying dischargeable water in sediment voids of a salt cavern gas storage according to claim 1, wherein the obtaining the water holding capacity w of the sediment sample comprises:
loading the sediment sample into a measuring cylinder, and reading the free accumulation volume V of the sediment sample in the measuring cylinder0；
Adding V into the measuring cylinder1A volume of water such that a liquid level in the graduated cylinder is level with a highest position of the sediment sample in the graduated cylinder;
discharging the water in the measuring cylinder from a bottom water discharge hole of the measuring cylinder, and recording the volume V of the discharged water2；
And calculating the water holding coefficient w of the sediment sample, wherein the specific calculation formula is as follows:
6. the method of claim 1, wherein the calculating the volume V of exhaustible brine of the target salt deposit is performed by calculating the volume V of exhaustible brine of the sediment gap of the salt cavern gas storagekThereafter, the method further comprises:
measuring the measurement volume of the brine space at the upper part of the sediment after the water dissolution and construction of the cavity of the salt cavity of the target salt layer by utilizing a sonar technology;
calculating an exhaustible brine inspection volume according to the measured volume of the brine space;
determining whether a difference between the volume of exhaustible water and the inspected volume of exhaustible water is less than a set threshold;
if so, determining that the volume of the dischargeable brine is the volume of the dischargeable brine of the target salt layer after the salt cavity is water-dissolved in the salt cavity.
7. The method of calculating the exhaustible brine volume in the sediment gap of salt cavern gas storage according to claim 6, wherein calculating the exhaustible brine test volume according to the volume of the brine space comprises:
calculating dischargeable brine inspection volume V'kThe specific calculation formula is as follows:
wherein, V'bIs the measured volume of the brine space.
8. The method according to claim 2, wherein the first set temperature is in a range of 100 to 110 degrees celsius and the first set time period is in a range of 40 to 60 hours.
9. The method according to claim 3, wherein the second set temperature is in a range of 30 to 50 degrees Celsius, and the first set time period is in a range of 25 to 35 days.
10. The method of calculating the volume of exhaustible brine in a sediment gap of a salt cavern gas storage according to claim 6, wherein the method of calculating the set threshold comprises:
calculating the set threshold value delta, wherein a specific calculation formula is as follows:
Δ＝k·Vk；
wherein k is a set ratio value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010883507.1A CN112036027B (en) | 2020-08-28 | 2020-08-28 | Calculation method for volume of salt cavern gas storage sediment void dischargeable brine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010883507.1A CN112036027B (en) | 2020-08-28 | 2020-08-28 | Calculation method for volume of salt cavern gas storage sediment void dischargeable brine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112036027A true CN112036027A (en) | 2020-12-04 |
| CN112036027B CN112036027B (en) | 2024-09-03 |
Family
ID=73587352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010883507.1A Active CN112036027B (en) | 2020-08-28 | 2020-08-28 | Calculation method for volume of salt cavern gas storage sediment void dischargeable brine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112036027B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588306A (en) * | 2021-07-15 | 2021-11-02 | 江苏科技大学 | Experimental device and experimental method for gas storage of residues in bottom pit of old cavity for salt mining |
| CN113670403A (en) * | 2021-09-09 | 2021-11-19 | 山东鲁银盐穴储能工程技术有限公司 | Salt cavern cavity shape measuring method |
| CN114293966A (en) * | 2022-01-06 | 2022-04-08 | 山东鲁银盐穴储能工程技术有限公司 | Inversion method for net space in sediment filling cavity |
| CN114856507A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas injection and production device and gas injection and production method for salt cavern gas storage |
| CN115688480A (en) * | 2022-11-18 | 2023-02-03 | 山东鲁银盐穴储能工程技术有限公司 | Method for determining sediment storage capacity of multi-interlayer salt cavern storage |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110206459A1 (en) * | 2009-06-23 | 2011-08-25 | Tunget Bruce A | Appatus and methods for forming and using subterranean salt cavern |
| JP2016095196A (en) * | 2014-11-13 | 2016-05-26 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Thermal expansion coefficient measurement method and thermomechanical analysis apparatus |
| CN107701189A (en) * | 2017-10-31 | 2018-02-16 | 中国科学院武汉岩土力学研究所 | The high large-scale gas storage twin-well method of construction of impurity salt mine |
| CN107905844A (en) * | 2017-10-31 | 2018-04-13 | 中国科学院武汉岩土力学研究所 | The old chamber of salt mine adopts space gas injection row's halogen method entirely |
| CN108228929A (en) * | 2016-12-15 | 2018-06-29 | 中国石油天然气股份有限公司 | Method and device for predicting accumulation form of insoluble substances in cavity building process of salt cavern gas storage |
| CN109521185A (en) * | 2018-12-29 | 2019-03-26 | 武汉大学 | The remaining broken swollen coefficient measuring method of Coal measures rocks and system |
| CN111366493A (en) * | 2020-03-18 | 2020-07-03 | 青海省柴达木综合地质矿产勘查院 | Test method for density, moisture and porosity water supply degree of salt lake brine layer |
| CN111577387A (en) * | 2020-04-02 | 2020-08-25 | 湖北寰安康华安全科技发展有限责任公司 | Method for forming irregular salt cavern gas storage |
-
2020
- 2020-08-28 CN CN202010883507.1A patent/CN112036027B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110206459A1 (en) * | 2009-06-23 | 2011-08-25 | Tunget Bruce A | Appatus and methods for forming and using subterranean salt cavern |
| JP2016095196A (en) * | 2014-11-13 | 2016-05-26 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Thermal expansion coefficient measurement method and thermomechanical analysis apparatus |
| CN108228929A (en) * | 2016-12-15 | 2018-06-29 | 中国石油天然气股份有限公司 | Method and device for predicting accumulation form of insoluble substances in cavity building process of salt cavern gas storage |
| CN107701189A (en) * | 2017-10-31 | 2018-02-16 | 中国科学院武汉岩土力学研究所 | The high large-scale gas storage twin-well method of construction of impurity salt mine |
| CN107905844A (en) * | 2017-10-31 | 2018-04-13 | 中国科学院武汉岩土力学研究所 | The old chamber of salt mine adopts space gas injection row's halogen method entirely |
| CN109521185A (en) * | 2018-12-29 | 2019-03-26 | 武汉大学 | The remaining broken swollen coefficient measuring method of Coal measures rocks and system |
| CN111366493A (en) * | 2020-03-18 | 2020-07-03 | 青海省柴达木综合地质矿产勘查院 | Test method for density, moisture and porosity water supply degree of salt lake brine layer |
| CN111577387A (en) * | 2020-04-02 | 2020-08-25 | 湖北寰安康华安全科技发展有限责任公司 | Method for forming irregular salt cavern gas storage |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856507A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Gas injection and production device and gas injection and production method for salt cavern gas storage |
| CN114856507B (en) * | 2021-02-04 | 2024-03-01 | 中国石油天然气股份有限公司 | Gas injection and production device and gas injection and production method for salt cavern gas storage |
| CN113588306A (en) * | 2021-07-15 | 2021-11-02 | 江苏科技大学 | Experimental device and experimental method for gas storage of residues in bottom pit of old cavity for salt mining |
| CN113588306B (en) * | 2021-07-15 | 2022-07-19 | 江苏科技大学 | Experimental device and experimental method for gas storage of residues in bottom pit of old cavity for salt mining |
| CN113670403A (en) * | 2021-09-09 | 2021-11-19 | 山东鲁银盐穴储能工程技术有限公司 | Salt cavern cavity shape measuring method |
| CN113670403B (en) * | 2021-09-09 | 2024-04-02 | 山东鲁银盐穴储能工程技术有限公司 | Salt cavern cavity shape measurement method |
| CN114293966A (en) * | 2022-01-06 | 2022-04-08 | 山东鲁银盐穴储能工程技术有限公司 | Inversion method for net space in sediment filling cavity |
| CN114293966B (en) * | 2022-01-06 | 2024-01-16 | 山东鲁银盐穴储能工程技术有限公司 | Clear space inversion method in sediment filling cavity |
| CN115688480A (en) * | 2022-11-18 | 2023-02-03 | 山东鲁银盐穴储能工程技术有限公司 | Method for determining sediment storage capacity of multi-interlayer salt cavern storage |
| CN115688480B (en) * | 2022-11-18 | 2024-01-12 | 山东鲁银盐穴储能工程技术有限公司 | Method for determining sediment storage capacity of multi-interlayer salt cavern storage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112036027B (en) | 2024-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112036027B (en) | Calculation method for volume of salt cavern gas storage sediment void dischargeable brine | |
| Li et al. | Experimental study on the disintegration of loess in the Loess Plateau of China | |
| CN108535132B (en) | Weak cementation rock mass water absorption test device and test method | |
| CN110285863B (en) | Method for measuring available volume of salt cavern | |
| Fang et al. | Analysis of Changes in the Micromorphology of Sandstone Joint Surface under Dry‐Wet Cycling | |
| CN112540033A (en) | Test device for salt deposit sediment void ratio and gas displacement brine | |
| CN112858156A (en) | Bentonite erosion simulation test device and test method | |
| CN108007422A (en) | A kind of experimental rig for measuring swelling rock free swelling rate | |
| Feng et al. | Influence of acidic environment on damage mechanism of sandstone under different climatic temperatures | |
| CN105547959A (en) | Analysis method for natural gas storage capacity of matrix pores in dense bedrock | |
| CN212658649U (en) | Salt expansion measuring device for carbonized improved salinized soil | |
| Alonso et al. | Monitoring large-scale tests for nuclear waste disposal | |
| CN102435540A (en) | Shallow sand permeability coefficient measuring system and method | |
| CN107748187A (en) | Traditional building wall rate-of-loss of coolant method of testing | |
| CN115310026B (en) | Bentonite expansive force prediction method and system considering ionic hydration energy | |
| CN112098456A (en) | Device for measuring salt swelling property of carbonized improved saline soil and operation method | |
| CN107389532A (en) | A kind of experimental rig and method for being used to test porous engineering material space distribution characteristics | |
| CN111460703A (en) | Simulation calculation method for freezing shaft sinking process of coal mine vertical shaft | |
| CN108333329B (en) | Multifunctional test device for on-site determination of salt expansion of sulfate saline soil | |
| CN117347412A (en) | Shale oil elastic extraction degree testing method based on online nuclear magnetic resonance | |
| CN107560963A (en) | A kind of ultimate soft rock one side dehydration slaking test method | |
| CN113533679A (en) | Rock free expansion rate tester | |
| Kamura et al. | Effectiveness of resistivity monitoring for interpreting temporal changes in landfill properties | |
| Zhu et al. | Volume Changes and Mechanical Properties of Expansive Mudstone below Canals under Wet‐Dry/Wet‐Dry‐Freeze‐Thaw Cycles | |
| CN207457017U (en) | A kind of experimental rig for being used to test porous engineering material porosity distribution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |