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
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- 150000003839 salts Chemical class 0.000 title claims abstract description 133
- 239000013049 sediment Substances 0.000 title claims abstract description 130
- 239000012267 brine Substances 0.000 title claims abstract description 90
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000243 solution Substances 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 16
- 239000011800 void material Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000013467 fragmentation Methods 0.000 claims abstract description 11
- 238000006062 fragmentation reaction Methods 0.000 claims abstract description 11
- 235000002639 sodium chloride Nutrition 0.000 claims description 139
- 238000004364 calculation method Methods 0.000 claims description 28
- 238000009825 accumulation Methods 0.000 claims description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 17
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000010442 halite Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005063 solubilization Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 40
- 239000007789 gas Substances 0.000 description 25
- 230000035508 accumulation Effects 0.000 description 13
- 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
- 239000011435 rock 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
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明涉及油气资源地下勘探技术领域，具体涉及一种盐穴储气库沉渣空隙可排卤水体积计算方法。该方法包括：制作目标盐层中的沉渣样本；获取所述沉渣样本的膨胀系数；获取所述沉渣样本的碎涨系数；获取所述沉渣样本的持水系数；计算所述目标盐层的可排卤水体积。本发明利用目标盐层中的沉渣样本，获取用于表征沉渣在目标盐层中实际物理状态的膨胀系数、碎涨系数和持水系数，然后结合盐腔水溶造腔过程中的相关现场参数，对目标盐层处的地下溶腔进行了精确建模，从而准确地计算出了高杂质盐穴储气库沉渣空隙可排卤水体积。
The invention relates to the technical field of underground exploration of oil and gas resources, in particular to a method for calculating the volume of brine that can be drained in the slag void of a salt cavern gas storage. The method includes: making a sediment sample in a target salt layer; acquiring the expansion coefficient of the sediment sample; acquiring the crush expansion coefficient of the sediment sample; acquiring the water holding coefficient of the sediment sample; Drain brine volume. The invention utilizes the sediment samples in the target salt layer to obtain the expansion coefficient, fragmentation coefficient and water holding coefficient which are used to characterize the actual physical state of the sediment in the target salt layer, and then combines the relevant field parameters in the process of water-dissolving the salt cavity to create a cavity, The underground solution cavity at the target salt layer is accurately modeled, and the brine volume that can be drained in the sediment void of the high-impurity salt-cavern gas storage is calculated accurately.
Description
技术领域technical field
本发明涉及油气资源地下勘探技术领域，具体涉及一种盐穴储气库沉渣空隙可排卤水体积计算方法。The invention relates to the technical field of underground exploration of oil and gas resources, in particular to a method for calculating the volume of brine that can be drained in the slag void of a salt cavern gas storage.
背景技术Background technique
盐岩水溶形成的地下溶腔，是国际公认的大规模储存天然气的优良场所。由于我国盐岩多为湖湘沉积形成，具有盐层厚度薄、夹层多、不溶物含量高等特点，水溶形成的溶腔在储气库腔底堆积大量不溶物，形成不溶物堆积体(即“沉渣”)，这些沉渣堆积体占据较多溶腔空间。传统储气库是通过利用注入天然气的压力把盐腔上部空间的卤水压到地表，利用上部卤水空间进行储气。但在高杂质盐穴中，较多的沉渣占据大量储气空间，造成储气库上部可用储气空间小，储气库库容小。利用沉渣储气技术排出沉渣空隙卤水，利用一部分沉渣空隙进行储气，则能够有效扩大储气空间，增加储气库库容。The underground cavity formed by the water dissolution of salt rock is internationally recognized as an excellent place for large-scale storage of natural gas. Since most of the salt rocks in my country are formed by Hunan deposits, which have the characteristics of thin salt layer, many interlayers, and high content of insoluble matter, the solution cavity formed by water solubility accumulates a large amount of insoluble matter at the bottom of the gas storage cavity, forming an insoluble matter accumulation body (that is, "" Sediments”), these sediment accumulations occupy more cavity space. The traditional gas storage uses the pressure of injected natural gas to press the brine in the upper space of the salt cavity to the surface, and uses the upper brine space for gas storage. However, in the high-impurity salt cavern, more sediment occupies a large amount of gas storage space, resulting in a small available gas storage space in the upper part of the gas storage and a small storage capacity of the gas storage. Using the sediment gas storage technology to discharge the brine in the sediment voids and using a part of the sediment voids for gas storage can effectively expand the gas storage space and increase the storage capacity of the gas storage.
目前利用盐穴储气库沉渣空隙储气，国内外没有工程先例，是一个新的技术领域。现场实验和声呐测腔发现，在高杂质盐穴储气库中，沉渣具有很高的空隙率和良好的连通性，利用天然气驱替沉渣空隙卤水的方法是可行的。但是对沉渣空隙可储气体体积(即沉渣空隙可排卤水体积)并没有相关评价标准，亟需一种能够准确获取高杂质盐穴储气库沉渣空隙可排卤水体积的方案。At present, there is no engineering precedent at home and abroad to use the slag voids of the salt cavern gas storage to store gas, and it is a new technical field. Field experiments and sonar measurements show that in high-impurity salt-cavern gas storage, the sediment has a high porosity and good connectivity, and the method of using natural gas to displace the sediment void brine is feasible. However, there is no relevant evaluation standard for the volume of gas that can be stored in the sediment voids (that is, the volume of brine that can be drained in the sediment voids).
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供一种盐穴储气库沉渣空隙可排卤水体积计算方法，以准确计算高杂质盐穴储气库沉渣空隙可排卤水体积。The purpose of the present invention is to provide a method for calculating the volume of brine that can be drained in the slag voids of the salt cavern gas storage, so as to accurately calculate the volume of brine that can be drained in the slag voids of the high impurity salt cavern gas storage.
为实现上述目的，本发明实施例提供了一种盐穴储气库沉渣空隙可排卤水体积计算方法，包括：In order to achieve the above purpose, an embodiment of the present invention provides a method for calculating the volume of brine that can be drained in the sediment void of a salt cavern gas storage, including:
制作目标盐层中的沉渣样本；Making sediment samples in the target salt formation;
获取所述沉渣样本的膨胀系数d；obtaining the expansion coefficient d of the sediment sample;
获取所述沉渣样本的碎涨系数b；Obtain the fragmentation coefficient b of the sediment sample;
获取所述沉渣样本的持水系数w；obtaining the water holding coefficient w of the sediment sample;
计算所述目标盐层的可排卤水体积Vk，具体的计算公式为：Calculate the drainable brine volume V k of the target salt layer, and the specific calculation formula is:
其中，a为所述目标盐层中的沉渣不溶物含量，ρ为所述目标盐层中的固体盐密度，M为所述目标盐层在盐腔水溶造腔过程中的采出石盐总质量，c为所述目标盐层在盐腔水溶造腔过程中的采出卤水平均含盐浓度。Among them, a is the content of sediment insolubles in the target salt layer, ρ is the solid salt density in the target salt layer, and M is the total mass of mined rock salt in the target salt layer during the process of water-dissolving caverns in the target salt layer , c is the average salt concentration of the produced brine of the target salt layer in the process of water-dissolving the salt cavity.
在一种可能的实施例中，所述制作目标盐层中的沉渣样本，包括：In a possible embodiment, the preparation of the sediment sample in the target salt layer includes:
通过现场钻孔，获取所述目标盐层的岩心样本；Obtain core samples of the target salt layer by drilling on-site;
将所述岩心样本浸泡在水中，溶解所述岩心样本中可溶的石盐，获取沉渣不积物；soaking the core sample in water, dissolving the soluble halite in the core sample, and obtaining sediment without accumulation;
将所述沉渣不积物在第一设定温度下进行第一设定时长的烘干处理，获取沉渣样本。Carrying out a drying treatment on the sediment without accumulation at a first set temperature for a first set period of time to obtain a sediment sample.
在一种可能的实施例中，所述获取所述沉渣样本的膨胀系数d，包括：In a possible embodiment, the obtaining the expansion coefficient d of the sediment sample includes:
将所述沉渣样本装入量筒中，读取所述沉渣样本在所述量筒中的自由堆积体积V0；Load the sediment sample into a graduated cylinder, and read the free accumulation volume V 0 of the sediment sample in the graduated cylinder;
在所述量筒中加入设定浓度的氯化钠溶液，并将所述量筒在第二设定温度下进行第二设定时长的静置处理，读取所述沉渣样本在所述量筒中膨胀稳定后的膨胀体积V；A set concentration of sodium chloride solution is added to the measuring cylinder, and the measuring cylinder is left to stand at a second set temperature for a second set period of time, and the sediment sample is read to expand in the measuring cylinder The expanded volume V after stabilization;
计算所述沉渣的膨胀系数d，具体的计算公式为：Calculate the expansion coefficient d of the sediment, and the specific calculation formula is:
在一种可能的实施例中，所述获取所述沉渣样本的碎涨系数b，包括：In a possible embodiment, the obtaining the fragmentation coefficient b of the sediment sample includes:
将所述沉渣样本装入量筒中，读取所述沉渣样本在所述量筒中的自由堆积体积V0；Load the sediment sample into a graduated cylinder, and read the free accumulation volume V 0 of the sediment sample in the graduated cylinder;
计算所述沉渣样本的碎涨系数b，具体的计算公式为：Calculate the fragmentation coefficient b of the sediment sample, and the specific calculation formula is:
其中，M0为所述沉渣样本的质量，ρ0为所述沉渣样本的密度。Wherein, M 0 is the mass of the sediment sample, and ρ 0 is the density of the sediment sample.
在一种可能的实施例中，所述获取所述沉渣样本的持水系数w，包括：In a possible embodiment, the obtaining the water holding coefficient w of the sediment sample includes:
将所述沉渣样本装入量筒中，读取所述沉渣样本在所述量筒中的自由堆积体积V0；Load the sediment sample into a graduated cylinder, and read the free accumulation volume V 0 of the sediment sample in the graduated cylinder;
向所述量筒中加入V1体积的水，以使所述量筒中的液面与所述沉渣样本在所述量筒中的最高位置平齐；adding V 1 volume of water to the graduated cylinder so that the liquid level in the graduated cylinder is flush with the highest position of the sediment sample in the graduated cylinder;
将所述量筒中的水从所述量筒的底部排水孔排出，记录排出水的体积V2；Drain the water in the graduated cylinder from the drainage hole at the bottom of the graduated cylinder, and record the volume V 2 of the discharged water;
计算所述沉渣样本的持水系数w，具体的计算公式为：Calculate the water holding coefficient w of the sediment sample, and the specific calculation formula is:
在一种可能的实施例中，所述计算所述目标盐层的可排卤水体积Vk之后，所述方法还包括：In a possible embodiment, after calculating the drainable brine volume V k of the target salt layer, the method further includes:
利用声呐技术，测量所述目标盐层在盐腔水溶造腔后沉渣上部的卤水空间的测量体积；Using sonar technology, measure the measurement volume of the brine space on the upper part of the sediment of the target salt layer after the water-dissolving cavity in the salt cavity;
根据所述卤水空间的测量体积，计算可排卤水检验体积；Calculate the test volume of drainable brine according to the measured volume of the brine space;
判断所述可排卤水体积和所述可排卤水检验体积之间的差值是否小于设定阈值；Determine whether the difference between the volume of the drainable brine and the test volume of the drainable brine is less than a set threshold;
若是，则认定所述可排卤水体积为所述目标盐层在盐腔水溶造腔后的可排卤水体积。If so, the drainable brine volume is determined to be the drainable brine volume of the target salt layer after the salt cavity is dissolved in water.
在一种可能的实施例中，所述根据所述卤水空间的体积，计算可排卤水检验体积，包括：In a possible embodiment, calculating the inspection volume of drainable brine according to the volume of the brine space includes:
计算可排卤水检验体积V′k，具体的计算公式为：To calculate the test volume V′ k of the drainable brine, the specific calculation formula is:
其中，V′b为所述卤水空间的测量体积。Wherein, V' b is the measured volume of the brine space.
在一种可能的实施例中，所述第一设定温度的取值范围为100摄氏度至110摄氏度，所述第一设定时长的取值范围为40小时至60小时。In a possible embodiment, the value range of the first set temperature is 100 degrees Celsius to 110 degrees Celsius, and the value range of the first set duration is 40 hours to 60 hours.
在一种可能的实施例中，所述第二设定温度的取值范围为30摄氏度至50摄氏度，所述第一设定时长的取值范围为25天至35天。In a possible embodiment, the value range of the second set temperature is 30 degrees Celsius to 50 degrees Celsius, and the value range of the first set duration is 25 days to 35 days.
在一种可能的实施例中，所述设定阈值的计算方法包括：In a possible embodiment, the calculation method of the set threshold includes:
计算所述设定阈值Δ，具体的计算公式为：To calculate the set threshold Δ, the specific calculation formula is:
Δ＝k·Vk；Δ=k·V k ;
其中，k为设定比例数值。Among them, k is the set scale value.
本发明与现有技术相比，具有如下的优点和有益效果：Compared with the prior art, the present invention has the following advantages and beneficial effects:
本发明中，利用目标盐层中的沉渣样本，获取用于表征沉渣在目标盐层中实际物理状态的膨胀系数、碎涨系数和持水系数，然后结合盐腔水溶造腔过程中的相关现场参数，对目标盐层处的地下溶腔进行了精确建模，从而准确地计算出了高杂质盐穴储气库沉渣空隙可排卤水体积。In the present invention, the sediment samples in the target salt layer are used to obtain the expansion coefficient, fragmentation coefficient and water holding coefficient used to characterize the actual physical state of the sediment in the target salt layer, and then combined with the relevant site in the process of water-dissolving caverns in the salt cavern The parameters of the underground cavity at the target salt layer are accurately modeled, and the brine volume that can be drained in the sediment void of the high-impurity salt cavern gas storage is accurately calculated.
附图说明Description of drawings
为了更清楚地说明本说明书实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本说明书的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present specification. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.
图1是本发明实施例提供的一种目标盐层处的地下溶腔的模型示意图；Fig. 1 is a model schematic diagram of an underground solution cavity at a target salt layer provided by an embodiment of the present invention;
图2是本发明实施例提供的一种盐穴储气库沉渣空隙可排卤水体积计算方法的流程图。FIG. 2 is a flow chart of a method for calculating the volume of brine that can be drained in the slag void of a salt cavern gas storage according to an embodiment of the present invention.
附图标记说明：1为地下溶腔的总体积，2为地下溶腔中可溶盐体积，3为地下溶腔中膨胀前的沉渣体积，4为地面采出盐的总体积，5为地下溶腔中卤水中的可溶盐的体积，6为地下溶腔中沉渣上部的卤水空间的体积，7为地下溶腔中膨胀后的沉渣体积。Description of reference numerals: 1 is the total volume of the underground cavity, 2 is the volume of soluble salt in the underground cavity, 3 is the sediment volume in the underground cavity before expansion, 4 is the total volume of salt produced on the ground, 5 is the underground cavity The volume of the soluble salt in the brine in the cavity, 6 is the volume of the brine space in the upper part of the sediment in the underground cavity, and 7 is the volume of the expanded sediment in the underground cavity.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整的描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例，基于本发明实施例，本领域普通技术人员所获得的所有其他实施例，都属于本发明实施例保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art fall within the protection scope of the embodiments of the present invention.
本发明首先对盐腔水溶造腔前后目标盐层的地下溶腔进行建模，如图1所示为本实施例提供的一种目标盐层处的地下溶腔的模型示意图，其中每个椭圆均代表相同的体积，本实施例希望通过以地下溶腔的总体积不变作为前提条件，给出模型中不同体积之间的计算公式。The present invention first models the underground cavity of the target salt layer before and after the water-dissolving cavity of the salt cavity. FIG. 1 is a schematic diagram of the model of the underground cavity at the target salt layer provided in this embodiment, wherein each ellipse All represent the same volume. In this example, it is hoped that the calculation formula between different volumes in the model is given by taking the total volume of the underground cavity unchanged as a precondition.
地下溶腔为含有可溶盐和不可溶的沉渣的拥有固定体积的地下腔体，因此无论其中可溶盐和不可溶的沉渣如何变化，其整体的总体积不发生改变。An underground cavity is an underground cavity with a fixed volume containing soluble salts and insoluble sediments, so no matter how the soluble salts and insoluble sediments change therein, the overall total volume does not change.
在进行盐腔水溶造腔前，可以将地下溶腔中的物质简单分为可溶盐和不可溶的沉渣，那么地下溶腔的总体积Vt即可简化为地下溶腔中可溶盐体积Vs和膨胀前的沉渣体积Vc，用公式来表达即为：Vt＝Vs+Vc。Before carrying out the water-soluble cavern construction, the substances in the underground cavern can be simply divided into soluble salt and insoluble sediment, then the total volume V t of the underground cavern can be simplified as the volume of soluble salt in the underground cavern V s and the sediment volume V c before expansion are expressed by the formula: V t =V s +V c .
其中，可溶盐体积Vs和膨胀前的沉渣体积Vc在目标盐层中呈均匀的比例分布，因此根据该不溶物含量a，即可计算出膨胀前的沉渣体积Vc，用公式来表达即为：Vc＝Vt×a。Among them, the soluble salt volume V s and the sediment volume V c before expansion are uniformly distributed in the target salt layer, so according to the insoluble content a, the sediment volume V c before expansion can be calculated. The expression is: V c =V t ×a.
在进行盐腔水溶造腔过程中，由于向地下溶腔中注入了大量的水，将地下溶腔中的全部可溶盐溶解，形成卤水，随后部分卤水被新注入的天然气排出地表，那么此时地下溶腔中可溶盐体积Vs由地面采出盐的总体积Vs1和地下溶腔中卤水中的可溶盐的体积Vs2两部分组成，用公式来表达即为：Vs＝Vs1+Vs2。其中，根据地面采出盐的总体积Vs1可以根据地面总质量M和目标岩层中的固体盐密度ρ计算获得，用公式来表达即为：
在进行盐腔水溶造腔之后，可以将地下溶腔中的空间体积简单分为地下溶腔中沉渣上部的卤水空间的体积Vb和膨胀后的沉渣体积Vn，用公式来表达即为：Vt＝Vb+Vn。那么，利用目标盐层在盐腔水溶造腔过程中的采出卤水平均含盐浓度以及地下溶腔中当前卤水所占体积等物理量，即可表示出地下溶腔中卤水中的可溶盐的体积Vs2，用公式来表达即为：
根据上述公式，可以推导出：According to the above formula, it can be deduced:
利用地下溶腔中可溶盐体积Vs、地面采出盐的总体积Vs1和地下溶腔中卤水中的可溶盐的体积Vs2之间的关系，可以推导出：Using the relationship between the volume of soluble salt in the underground cavity V s , the total volume of salt produced on the ground V s1 and the volume of soluble salt in the brine in the underground cavity V s2 , it can be deduced:
根据目标盐层的可排卤水体积Vk、膨胀后沉渣体积Vn和持水系数w之前的关系，可以推导出：According to the relationship between the drainable brine volume V k of the target salt layer, the expanded sediment volume V n and the water holding coefficient w, it can be deduced:
该计算公式中，目标盐层中的不溶物含量a、目标盐层中的固体盐密度ρ、目标盐层在盐腔水溶造腔过程中的采出石盐总质量M和目标盐层在盐腔水溶造腔过程中的采出卤水平均含盐浓度c均为现场参数，可直接从现场获取，而膨胀系数d、碎涨系数b和持水系数w，则不能直接从现场获得，需要在实验室内进行测量。In this calculation formula, the insoluble content a in the target salt layer, the solid salt density ρ in the target salt layer, the total mass M of the mined rock salt in the target salt layer in the process of water-dissolving caverning of the target salt layer, and the target salt layer in the salt cavern The average salt concentration c of the produced brine during the water-soluble cavity building process is a field parameter, which can be obtained directly from the field, while the expansion coefficient d, the break-up coefficient b and the water holding coefficient w cannot be obtained directly from the field, and need to be obtained in the experiment. Measure indoors.
为此，本实施例提供一种盐穴储气库沉渣空隙可排卤水体积计算方法，以通过上述公式来计算出可排卤水体积。请参阅图1，图1为该方法实施例的流程图，具体包括：To this end, this embodiment provides a method for calculating the volume of brine that can be drained in the slag gap of a salt cavern gas storage, so as to calculate the volume of brine that can be drained through the above formula. Please refer to FIG. 1. FIG. 1 is a flowchart of an embodiment of the method, which specifically includes:
步骤11，制作目标盐层中的沉渣样本。Step 11, making a sediment sample in the target salt layer.
这里，本发明还给出一种较优的沉渣样本的制作方案，具体为：Here, the present invention also provides a preferred preparation scheme of the sediment sample, which is specifically:
步骤21，通过现场钻孔，获取所述目标盐层的岩心样本。In step 21, a core sample of the target salt layer is obtained by drilling on-site.
步骤22，将所述岩心样本浸泡在水中，溶解所述岩心样本中可溶的石盐，获取沉渣不积物。Step 22, soaking the core sample in water to dissolve the soluble halite in the core sample to obtain no sediment.
具体的，可溶的石盐为一些诸如氯化钠和硫酸钠等可溶矿物盐，通过将现场取得的岩心浸泡在清水中，定期更换浸泡后的卤水，以充分溶解样品中的可溶矿物盐，最终得到不溶物沉渣颗粒。Specifically, the soluble rock salt is some soluble mineral salts such as sodium chloride and sodium sulfate. By soaking the cores obtained on site in clean water, the soaked brine is regularly replaced to fully dissolve the soluble minerals in the sample. salt, and finally obtain insoluble sediment particles.
步骤23，将所述沉渣不积物在第一设定温度下进行第一设定时长的烘干处理，获取沉渣样本。Step 23 , drying the sediment without accumulation at a first set temperature for a first set period of time to obtain a sediment sample.
具体的，第一设定温度的取值范围为100摄氏度至110摄氏度，第一设定时长的取值范围为40小时至60小时。Specifically, the value range of the first set temperature is 100 degrees Celsius to 110 degrees Celsius, and the value range of the first set duration is 40 hours to 60 hours.
步骤12，获取所述沉渣样本的膨胀系数d。Step 12, obtaining the expansion coefficient d of the sediment sample.
这里，本发明还给出一种较优的膨胀系数的获取方案，具体为：Here, the present invention also provides a solution for obtaining a better expansion coefficient, specifically:
步骤31，将所述沉渣样本装入量筒中，读取所述沉渣样本在所述量筒中的自由堆积体积V0。Step 31: Load the sediment sample into a graduated cylinder, and read the free accumulation volume V 0 of the sediment sample in the graduated cylinder.
具体的，可以将一定体积的沉渣样品倒入规格为250ml的量筒中，读取干样品在量筒中的自由堆积体积。Specifically, a certain volume of sediment sample can be poured into a measuring cylinder with a specification of 250 ml, and the free accumulation volume of the dry sample in the measuring cylinder can be read.
步骤32，在所述量筒中加入设定浓度的氯化钠溶液，并将所述量筒在第二设定温度下进行第二设定时长的静置处理，读取所述沉渣样本在所述量筒中膨胀稳定后的膨胀体积V。Step 32, add the sodium chloride solution of the set concentration to the measuring cylinder, and carry out the standstill treatment of the measuring cylinder at the second set temperature for the second set period of time, and read the sediment sample in the Expanded volume V after stable expansion in the graduated cylinder.
具体的，可以加入饱和氯化钠溶液来模拟溶腔卤水环境，然后把量筒放置于第二设定温度的恒温箱中养护第二设定时长，读取不溶物膨胀稳定后的体积。Specifically, a saturated sodium chloride solution can be added to simulate the brine environment of the solution cavity, and then the graduated cylinder is placed in an incubator with a second set temperature for a second set period of time, and the volume of the insoluble matter after the expansion is stabilized is read.
具体的，第二设定温度的取值范围为30摄氏度至50摄氏度，第一设定时长的取值范围为25天至35天。Specifically, the value range of the second set temperature is 30 degrees Celsius to 50 degrees Celsius, and the value range of the first set duration is 25 days to 35 days.
步骤33，计算所述沉渣的膨胀系数d，具体的计算公式为：Step 33, calculate the expansion coefficient d of the sediment, and the specific calculation formula is:
步骤13，获取所述沉渣样本的碎涨系数b。Step 13, obtaining the fragmentation coefficient b of the sediment sample.
这里，本发明还给出一种较优的碎涨系数获取方案，具体为：Here, the present invention also provides a better solution for obtaining the fragmentation coefficient, which is specifically:
步骤41，将所述沉渣样本装入量筒中，读取所述沉渣样本在所述量筒中的自由堆积体积V0。Step 41: Load the sediment sample into a graduated cylinder, and read the free accumulation volume V 0 of the sediment sample in the graduated cylinder.
步骤42，计算所述沉渣样本的碎涨系数b，具体的计算公式为：Step 42, calculate the fragmentation coefficient b of the sediment sample, and the specific calculation formula is:
其中，M0为所述沉渣样本的质量，ρ0为所述沉渣样本的密度。Wherein, M 0 is the mass of the sediment sample, and ρ 0 is the density of the sediment sample.
具体的，可以使用电子天平来直接称量沉渣样本的质量。Specifically, an electronic balance can be used to directly weigh the mass of the sediment sample.
步骤14，获取所述沉渣样本的持水系数w。Step 14, obtaining the water holding coefficient w of the sediment sample.
这里，本发明还给出一种较优的持水系数获取方案，具体为：Here, the present invention also provides a better water-holding coefficient acquisition scheme, specifically:
步骤51，将所述沉渣样本装入量筒中，读取所述沉渣样本在所述量筒中的自由堆积体积V0。Step 51: Load the sediment sample into a graduated cylinder, and read the free accumulation volume V 0 of the sediment sample in the graduated cylinder.
步骤52，向所述量筒中加入V1体积的水，以使所述量筒中的液面与所述沉渣样本在所述量筒中的最高位置平齐。Step 52 , adding V 1 volume of water to the measuring cylinder, so that the liquid level in the measuring cylinder is flush with the highest position of the sediment sample in the measuring cylinder.
步骤53，将所述量筒中的水从所述量筒的底部排水孔排出，记录排出水的体积V2。Step 53: Drain the water in the measuring cylinder from the drainage hole at the bottom of the measuring cylinder, and record the volume V 2 of the discharged water.
步骤54，计算所述沉渣样本的持水系数w，具体的计算公式为：Step 54, calculate the water holding coefficient w of the sediment sample, and the specific calculation formula is:
步骤15，计算所述目标盐层的可排卤水体积Vk，具体的计算公式为：Step 15: Calculate the drainable brine volume V k of the target salt layer, and the specific calculation formula is:
其中，a为所述目标盐层中的不溶物含量，ρ为所述目标盐层中的固体盐密度，M为所述目标盐层在盐腔水溶造腔过程中的采出石盐总质量，c为所述目标盐层在盐腔水溶造腔过程中的采出卤水平均含盐浓度。Among them, a is the insoluble content in the target salt layer, ρ is the solid salt density in the target salt layer, M is the total mass of the mined rock salt in the target salt layer in the process of water-solubilization in the salt cavity, c is the average salt concentration of the produced brine of the target salt layer in the process of water-dissolving cavity in the salt cavity.
在一种可能的实施例中，为了提高可排卤水体积的计算精度，本发明还给出了以下方案：In a possible embodiment, in order to improve the calculation accuracy of the drainable brine volume, the present invention also provides the following solutions:
所述计算所述目标盐层的可排卤水体积Vk之后，所述方法还包括：After calculating the drainable brine volume V k of the target salt layer, the method further includes:
步骤61，利用声呐技术，测量所述目标盐层在盐腔水溶造腔后沉渣上部的卤水空间的测量体积。Step 61 , using the sonar technology, measure the measured volume of the brine space above the sediment of the target salt layer after the water dissolving cavity is formed in the salt cavity.
步骤62，根据所述卤水空间的测量体积，计算可排卤水检验体积。Step 62: Calculate the inspection volume of drainable brine according to the measured volume of the brine space.
具体的，计算过程包括：Specifically, the calculation process includes:
步骤71，计算可排卤水检验体积V′k，具体的计算公式为：Step 71: Calculate the test volume V′ k of the drainable brine, and the specific calculation formula is:
其中，V′b为所述卤水空间的测量体积。Wherein, V' b is the measured volume of the brine space.
步骤63，判断所述可排卤水体积和所述可排卤水检验体积之间的差值是否小于设定阈值。Step 63, judging whether the difference between the volume of the drainable brine and the inspection volume of the drainable brine is less than a set threshold.
具体的，本实施例通过声呐测量和模型直接数值计算两种方式来相互配合，提高了可排卤水检验体积的准确度。Specifically, in this embodiment, the sonar measurement and the model direct numerical calculation are used to cooperate with each other, thereby improving the accuracy of the test volume of drainable brine.
具体的，设定阈值的计算方法包括：Specifically, the calculation method for setting the threshold includes:
步骤81，计算所述设定阈值Δ，具体的计算公式为：Step 81: Calculate the set threshold Δ, and the specific calculation formula is:
Δ＝k·Vk；Δ=k·V k ;
其中，k为设定比例数值。Among them, k is the set scale value.
步骤64，若是，则认定所述可排卤水体积为所述目标盐层在盐腔水溶造腔后的可排卤水体积。Step 64, if yes, determine that the drainable brine volume is the drainable brine volume of the target salt layer after the salt cavity is dissolved in water.
这里，本发明以淮安地区某高杂质盐穴储气库为例，来说明本实施例计算可排卤水体积的方案。Here, the present invention takes a high-impurity salt cavern gas storage in Huai'an area as an example to illustrate the solution for calculating the volume of drainable brine in this embodiment.
1、获取盐矿地层赋存特征1. Obtain the occurrence characteristics of salt mine strata
该盐穴建腔过程中的采盐总量24万t，采出卤水卤水含盐浓度280g/l，开采盐岩层的不溶物含量0.35，固体盐密度2200kg/m3。The total amount of salt mined in the process of building the salt cavern is 240,000 t, the salt concentration of the mined brine is 280g/l, the insoluble matter content of the mined salt rock layer is 0.35, and the solid salt density is 2200kg/m 3 .
2、室内溶解试验获得沉渣样品2. Indoor dissolution test to obtain sediment samples
将现场取得的岩心浸泡在清水中，定期更换浸泡后的卤水，以充分溶解样品中的可溶矿物(氯化钠、硫酸钠等)，得到不溶物沉渣颗粒。将不溶物沉渣颗粒在105℃±5℃的温度环境中进行48h烘干后，取得沉渣样品。Soak the core obtained on site in clean water, and replace the soaked brine regularly to fully dissolve the soluble minerals (sodium chloride, sodium sulfate, etc.) in the sample to obtain insoluble sediment particles. After drying the insoluble sediment particles in a temperature environment of 105 °C ± 5 °C for 48 hours, the sediment samples were obtained.
3、室内测定沉渣不溶颗粒膨胀系数3. Indoor determination of the expansion coefficient of sediment insoluble particles
采用量筒量取100ml的不溶物试样倒入规格为250ml的量筒中，加入饱和氯化钠溶液来模拟溶腔卤水环境，此时读取初始量筒体积105ml，然后把量筒并放置于40℃的恒温箱中养护30h，读取不溶物膨胀稳定后的体积110ml，计算得到不溶物膨胀系数1.0476。Use a measuring cylinder to measure 100ml of insoluble sample and pour it into a 250ml measuring cylinder, add saturated sodium chloride solution to simulate the brine environment of the solution cavity, read the initial volume of the measuring cylinder of 105ml, and then place the measuring cylinder at 40 ℃. After curing in an incubator for 30h, read the volume of insoluble matter after the expansion and stabilization of 110ml, and calculate the insoluble matter expansion coefficient of 1.0476.
4、室内测定沉渣碎胀系数4. Indoor determination of sediment expansion coefficient
采用量筒量取一定体积的沉渣样品倒入规格为250ml的量筒中，读取干样品在量筒中的自由堆积体积110ml。相同样品放到电子天平上，测出样品质量M0。计算得到沉渣碎胀系数1.6。Use a graduated cylinder to measure a certain volume of sediment sample and pour it into a 250 ml graduated cylinder, and read the free stacking volume of the dry sample in the graduated cylinder of 110 ml. The same sample is placed on an electronic balance, and the sample mass M 0 is measured. The calculated slag expansion coefficient was 1.6.
5、室内测定沉渣样品持水系数5. Indoor determination of water holding coefficient of sediment samples
采用量筒量取一定体积的沉渣样品其放置于底部有排水孔的量筒中，记录干样品在量筒中的自由堆积体积120ml。用量筒往干样品中加水，直至水面刚好与沉渣表面齐平，记录加入水的体积50ml；待水面稳定后，打开量筒底部排水孔，并收集量筒中排出的水，待水不再排出，记录排出水的体积30ml。计算得到沉渣持水系数为0.167。Use a graduated cylinder to measure a certain volume of sediment sample and place it in a graduated cylinder with a drainage hole at the bottom, and record the free accumulation volume of the dry sample in the graduated cylinder of 120ml. Add water to the dry sample with the measuring cylinder until the water surface is just flush with the surface of the sediment, and record the volume of added water 50ml; after the water surface is stable, open the drainage hole at the bottom of the measuring cylinder, and collect the water discharged from the measuring cylinder. When the water is no longer discharged, record The volume of drained water is 30ml. The water retention coefficient of the sediment was calculated to be 0.167.
6、沉渣可排卤水体积计算6. Calculation of the volume of brine that can be drained by sediment
把以上得到的相关参数，代入公式
本发明实施例中提供的技术方案，至少具有如下技术效果或优点：The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
本发明实施例中，利用目标盐层中的沉渣样本，获取用于表征沉渣在目标盐层中实际物理状态的膨胀系数、碎涨系数和持水系数，然后结合盐腔水溶造腔过程中的相关现场参数，对目标盐层处的地下溶腔进行了精确建模，从而准确地计算出了高杂质盐穴储气库沉渣空隙可排卤水体积。In the embodiment of the present invention, the sediment samples in the target salt layer are used to obtain the expansion coefficient, fragmentation coefficient and water holding coefficient used to characterize the actual physical state of the sediment in the target salt layer, and then combined with Based on the relevant field parameters, the underground solution cavity at the target salt layer is accurately modeled, and the brine volume that can be drained in the sediment void of the high-impurity salt cavern gas storage can be accurately calculated.
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包括这些改动和变型在内。It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these 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.
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| 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 | A clear space inversion method in a sediment-filled cavity |
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| 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 |
| CN116413394A (en) * | 2023-04-19 | 2023-07-11 | 中国石油天然气股份有限公司 | Device and method for evaluating utilization capacity of sediment gap at bottom of salt cavern gas storage cavity |
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