Composite treatment system for gas well produced water

Abstract

The invention discloses a composite treatment system for gas well produced water, which is characterized in that a first medicament injection amount, a second medicament injection amount and a temperature parameter are detected in a pre-treatment period, the temperature is monitored in real time in the whole domain of the pre-treatment period, and the gas well produced water is obtained based on the magnitude judgment relation of a set threshold value. And the controller is used for determining the size relationship between the initial injection value and the reference injection threshold value, and reasonably selecting the injection amount of the flocculating agent according to the determined size relationship, so that the composite treatment system reasonably selects the flocculating agent which needs to be added subsequently by comprehensively considering the injection amount of the first medicament and the second medicament and the temperature range. Therefore, reasonable selection of agents during composite chemical precipitation treatment of the gas well produced water is achieved, composite treatment of different chemical precipitation agents is achieved, and the precipitation treatment performance of the gas well produced water is improved.

Description

Technical Field

[0001] The present application relates to the technical field of treatment of produced water from a gas well, and in particular to a composite treatment system for produced water from a gas well. Background Art

[0002] The composite treatment of gas well produced water is an important process, which aims to effectively treat the water produced by gas wells to meet environmental protection requirements and improve resource utilization. Gas well produced water usually has the following characteristics: High mineralization: contains a large amount of dissolved salts, such as sodium chloride, calcium chloride, etc. Contains harmful substances: may contain hydrogen sulfide, heavy metal ions and other substances that are harmful to the environment. Complexity: The water quality components are complex, and the water quality of produced water from different gas wells varies greatly.

[0003] Gas well produced water usually contains various harmful substances, such as heavy metals (such as mercury, cadmium, lead, etc.), salts, and a small amount of petroleum substances. If it is discharged directly without treatment, it will cause serious pollution to the soil, surface water, groundwater, etc., and damage the ecological environment. Treating gas well produced water can effectively remove these harmful substances and reduce the harm to the environment. Furthermore, salts and other substances in the produced water accumulate in pipes and equipment, causing corrosion and scaling. Corrosion will reduce the service life of pipes and equipment, increase maintenance costs, and may even cause safety accidents such as leakage. Scaling will reduce the flow cross-sectional area of ​​the pipeline and reduce the production efficiency of the gas well. Treating produced water can remove these corrosive and scaling substances and protect production equipment.

[0004] The produced water from gas wells is usually treated by chemical precipitation, in which chemical agents are added to the produced water to precipitate harmful substances in the water, thereby separating the water from the pollutants.

[0005] However, if different chemical agents are used for composite treatment, if the order or method of use of different chemical agents is not adjusted, it will seriously affect the precipitation effect of gas well produced water, and even produce more serious or complex compounds, and increase the waste and side effects of chemical precipitation agents. Summary of the invention

[0006] In an exemplary embodiment of the present application, a composite treatment system for gas well produced water is provided to achieve composite treatment of different chemical precipitation agents and improve the precipitation treatment performance of gas well produced water.

[0007] The present application provides a composite treatment system for gas well produced water, comprising: a pre-processing unit: used to obtain a first agent injection amount in a first time period in a pre-processing cycle, obtain a second agent injection amount in a second time period in the pre-processing cycle, the first time period being located at the front of the second time period in the pre-processing cycle, obtain a plurality of temperature parameters in the first time period and the second time period, and take the average value of the plurality of temperature parameters as an average temperature parameter;

[0008] A judgment processing unit: used for judging the magnitude relationship between the first medicine injection amount and the first medicine threshold, judging the magnitude relationship between the average second medicine injection amount and the second medicine threshold, judging the magnitude relationship between the average temperature parameter and the temperature parameter threshold;

[0009] Flocculant judgment unit: used for increasing the initial injection value with the first injection parameter if the average first agent injection amount is greater than the first agent threshold, otherwise maintaining the initial injection value unchanged; if the average second agent injection amount is greater than the second agent threshold, increasing the initial injection value with the first injection parameter, otherwise maintaining the initial injection value unchanged; if the average temperature parameter is less than the temperature parameter threshold, increasing the initial injection value with the second injection parameter, otherwise maintaining the initial injection value unchanged, wherein the second injection parameter is greater than the first injection parameter;

[0010] Flocculant injection unit: after comparing the average first agent injection amount, the average second agent injection amount and the average temperature parameter with the first agent threshold, the second agent threshold and the temperature parameter threshold respectively, determine the size relationship between the initial injection value and the reference injection threshold; if the initial injection value is greater than the reference injection threshold, inject the first flocculant injection amount; otherwise, inject the second flocculant injection amount; the first flocculant injection amount is greater than the second flocculant injection amount.

[0011] Further, after comparing the first agent injection amount, the second agent injection amount and the average temperature parameter with the first agent threshold, the second agent threshold and the temperature parameter threshold respectively, the initial injection value is determined by the accumulated value of the second injection parameter or the first injection parameter.

[0012] Furthermore, the second injection parameter is twice the first injection parameter.

[0013] Furthermore, the initial injection value is 0, and the first injection parameter and the second injection parameter are both greater than 0.

[0014] Furthermore, the first agent injection amount is the injection amount of the first agent, and the first agent is sodium hydroxide or calcium hydroxide.

[0015] Furthermore, the second agent injection amount is the injection amount of the second agent, and the second agent is sodium carbonate.

[0016] Furthermore, the first medicine threshold, the second medicine threshold, the temperature parameter threshold and the reference injection threshold are stored in a controller.

[0017] The embodiments of the present application have the following beneficial effects: the injection amount of the first agent, the injection amount of the second agent and the temperature parameters are detected in the pre-treatment cycle, and the temperature is monitored in real time in the entire pre-treatment cycle, and based on the size judgment relationship of the set threshold, the size relationship between the initial injection value and the reference injection threshold is determined, and the injection amount of the flocculant is reasonably selected according to the determined size relationship. Therefore, the composite treatment system comprehensively considers the injection amount of the first agent, the second agent and the temperature range to reasonably select the flocculant that needs to be added later, thereby realizing the reasonable selection of agents for the composite chemical precipitation treatment of gas well produced water, and then realizing the composite treatment of different chemical precipitation agents, and improving the precipitation treatment performance of gas well produced water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A system schematic diagram of a composite treatment system for gas well produced water provided in an embodiment of the present application is exemplarily shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0021] To further illustrate the technical solution provided by the embodiment of the present application, the following is a detailed description of this in conjunction with the accompanying drawings and specific implementation methods. Although the embodiment of the present application provides the operation steps of the composite processing system as shown in the following embodiments or drawings, more or fewer operation steps may be included in the composite processing system based on routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided by the embodiment of the present application.

[0022] refer to Figure 1 As shown, the present application provides a composite treatment system for produced water from a gas well, including a pre-treatment unit 100 , a judgment processing unit 200 , a flocculant judgment unit 300 , and a flocculant injection unit 400 .

[0023] The pre-processing unit 100 is used to obtain the first medicine injection amount in a first time period in the pre-processing cycle, and obtain the second medicine injection amount in a second time period in the pre-processing cycle.

[0024] Among them, the injection amount of the first agent is the injection amount of the first agent, the first agent is sodium hydroxide or calcium hydroxide, when treating gas well produced water, sodium hydroxide or calcium hydroxide can be added first to adjust the pH value so that some heavy metal ions form hydroxide precipitation.

[0025] The injection amount of the second agent is the injection amount of the second agent, the second agent is sodium carbonate, and sodium carbonate is added to remove hardness ions in the produced water of the gas well.

[0026] The first time period is located at the front of the second time period in the pre-treatment cycle, that is, when pre-treating the gas well produced water, the first agent is first injected in the first time period to adjust the pH value. After the first agent is injected, when the pH value of the gas well produced water reaches 7, the injection of the first agent is stopped and the injection amount of the first agent that has been injected at this time is used as the injection amount of the first agent.

[0027] After completing the injection of the first agent, enter the second time period of the pre-treatment week and start injecting the second agent. When determining the injection amount of the second agent, a comprehensive water quality analysis can be conducted on the gas well produced water to determine the concentration of hardness ions (such as calcium and magnesium ions) that need to be removed. This is the basis for calculating the injection amount of sodium carbonate, which is also the basis for calculating the injection amount of the second agent, and the injection amount of the second agent is determined.

[0028] Acquire multiple temperature parameters in the first time period and the second time period, and take the average value of the multiple temperature parameters as the average temperature parameter. The temperature parameter is the temperature of the gas well produced water that needs to be compositely treated. The multiple temperature parameters can be determined by performing multi-point interval detection in the first time period and the second time period.

[0029] The judgment processing unit 200 is used to judge the size relationship between the first agent injection amount and the first agent threshold, judge the size relationship between the average second agent injection amount and the second agent threshold, and judge the size relationship between the average temperature parameter and the temperature parameter threshold. The first agent threshold, the second agent threshold, the temperature parameter threshold and the reference injection threshold are stored in the controller. By judging the size relationship between the first agent injection amount and the first agent threshold, the second agent injection amount and the second agent threshold, and the average temperature parameter and the temperature parameter threshold, the injection amount of the flocculant in the subsequent processing stage is determined, providing theoretical guidance for the injection of the flocculant, avoiding the operation problem of low efficiency or inaccurate injection amount caused by determining the injection of the flocculant through experience.

[0030] The flocculant judgment unit 300 is used to increase the initial injection value by the first injection parameter if the average first agent injection amount is greater than the first agent threshold, otherwise the initial injection value is maintained unchanged. If the average second agent injection amount is greater than the second agent threshold, the initial injection value is increased by the first injection parameter, otherwise the initial injection value is maintained unchanged.

[0031] If the average temperature parameter is less than the temperature parameter threshold, the initial injection value is increased by the second injection parameter, otherwise the initial injection value is maintained unchanged, wherein the second injection parameter is greater than the first injection parameter.

[0032] Specifically, the initial injection value is the basis for evaluating the subsequent increase in flocculant. The initial injection value is accumulated to determine its relationship with the benchmark injection threshold, and the first flocculant injection amount or the second flocculant injection amount is selected for effective injection. The first flocculant injection amount and the second flocculant injection amount are both initial flocculant injection amounts. The user can selectively increase the flocculant or stop increasing the flocculant according to the flocculation and sedimentation conditions after adding the flocculant. By reasonably selecting the initial flocculant injection amount, the processing efficiency of the flocculant during injection can be effectively improved to prevent multiple increases in flocculant from failing to achieve effective sedimentation, or large sedimentation from occurring when the flocculant is added for the first time.

[0033] The flocculant injection unit 400 determines the magnitude relationship between the initial injection value and the reference injection threshold value after comparing the first agent injection amount, the second agent injection amount and the average temperature parameter with the first agent threshold value, the second agent threshold value and the temperature parameter threshold value, respectively. After comparing the average first agent injection amount, the average second agent injection amount and the average temperature parameter with the first agent threshold value, the second agent threshold value and the temperature parameter threshold value, respectively, the initial injection value is determined by the second injection parameter or the accumulated value of the first injection parameter.

[0034] If the initial injection value is greater than the reference injection threshold, the first flocculant injection amount is used for injection, which means that the first agent injection amount or the second agent injection amount is large, or the current temperature is low, and more flocculants need to be injected to improve the flocculation effect. Specifically, the current low temperature indicates that the temperature of the gas well produced water that needs to be mixed and treated is low, and less flocculants may produce lower flocculation and sedimentation effects, so it is necessary to increase the amount of flocculants used and inject them at the first flocculant injection amount.

[0035] If the initial injection value is less than or equal to the reference injection threshold, the second flocculant injection amount is used for injection, and the first flocculant injection amount is greater than the second flocculant injection amount. This means that the first agent injection amount or the second agent injection amount is small, or the current temperature is high, and less flocculant needs to be injected to improve the flocculation effect. Specifically, the current high temperature indicates that the temperature of the gas well produced water that needs to be mixed and treated is high, so only less flocculant is needed to produce a better flocculation effect under the current high temperature working condition, which will not affect the waste of flocculants.

[0036] When adding flocculants, they should be added after the reaction of other precipitants is basically completed. This can avoid unnecessary reactions between the flocculants and other precipitants, and at the same time ensure that the flocculants can effectively condense the already formed precipitates into larger particles, which is convenient for subsequent solid-liquid separation and prevents the formation of more complex compounds that may affect the precipitation effect due to the formation of some ions that could have been removed by hydroxide or carbonate precipitation.

[0037] The second injection parameter is twice the first injection parameter. The initial injection value is 0, and both the first injection parameter and the second injection parameter are greater than 0.

[0038] Specifically, the initial injection value is 0, the first injection parameter and the second injection parameter are both greater than 0, and the second injection parameter is twice the first injection parameter.

[0039] For example, the first injection parameter is 2 and the second injection parameter is 4. If the average first agent injection amount is greater than the first agent threshold, the average second agent injection amount is less than the second agent threshold, and the average temperature parameter is greater than the temperature parameter threshold, then the initial injection value is determined as 6 by accumulating a first injection parameter and a second injection parameter.

[0040] If the average first agent injection amount is less than the first agent threshold, the average second agent injection amount is greater than the second agent threshold, and the average temperature parameter is greater than the temperature parameter threshold, the initial injection value is determined to be 6 by accumulating a first injection parameter and a second injection parameter.

[0041] If the average first agent injection amount is greater than the first agent threshold, the average second agent injection amount is greater than the second agent threshold, and the average temperature parameter is greater than the temperature parameter threshold, the initial injection value is determined to be 8 by accumulating two first injection parameters and one second injection parameter.

[0042] If the average first agent injection amount is less than the first agent threshold, the average second agent injection amount is less than the second agent threshold, and the average temperature parameter is greater than the temperature parameter threshold, the initial injection value is determined to be 4 by accumulating only one second injection parameter.

[0043] The injection amount of the first agent, the injection amount of the second agent and the temperature parameters are detected during the pre-treatment cycle, and the temperature is monitored in real time throughout the pre-treatment cycle. Based on the size judgment relationship of the set threshold, the size relationship between the initial injection value and the benchmark injection threshold is determined, and the injection amount of the flocculant is reasonably selected according to the determined size relationship. Therefore, the composite treatment system comprehensively considers the injection amount of the first agent, the second agent and the temperature range to reasonably select the flocculant that needs to be added later, thereby realizing the reasonable selection of agents for the composite chemical precipitation treatment of gas well produced water, and then realizing the composite treatment of different chemical precipitation agents, and improving the precipitation treatment performance of gas well produced water.

[0044] Those skilled in the art will appreciate that the embodiments of the present application can be provided as a composite processing system, system, or computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0045] The present application is described with reference to the flowcharts and / or block diagrams of the composite processing system, device (system), and computer program product according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0046] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0047] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A composite treatment system for gas well produced water, characterized in that: include: A pre-processing unit: used for obtaining a first medicine injection amount in a first time period in a pre-processing cycle, obtaining a second medicine injection amount in a second time period in the pre-processing cycle, wherein the first time period is located in front of the second time period in the pre-processing cycle, obtaining a plurality of temperature parameters in the first time period and the second time period, and taking an average value of the plurality of temperature parameters as an average temperature parameter; A judgment processing unit: used for judging the magnitude relationship between the first medicine injection amount and the first medicine threshold, judging the magnitude relationship between the average second medicine injection amount and the second medicine threshold, judging the magnitude relationship between the average temperature parameter and the temperature parameter threshold; A flocculant determination unit: used for increasing the initial injection value with the first injection parameter if the average first agent injection amount is greater than the first agent threshold, otherwise maintaining the initial injection value unchanged; If the average second medicine injection amount is greater than the second medicine threshold, the initial injection value is increased by the first injection parameter, otherwise the initial injection value is maintained unchanged; If the average temperature parameter is less than the temperature parameter threshold, the initial injection value is increased by a second injection parameter, otherwise the initial injection value is maintained unchanged, wherein the second injection parameter is greater than the first injection parameter; Flocculant injection unit: after comparing the average first agent injection amount, the average second agent injection amount and the average temperature parameter with the first agent threshold, the second agent threshold and the temperature parameter threshold respectively, determine the size relationship between the initial injection value and the reference injection threshold; if the initial injection value is greater than the reference injection threshold, inject the first flocculant injection amount; otherwise, inject the second flocculant injection amount; the first flocculant injection amount is greater than the second flocculant injection amount.

2. The composite processing system according to claim 1, characterized in that: After comparing the first agent injection amount, the second agent injection amount and the average temperature parameter with the first agent threshold, the second agent threshold and the temperature parameter threshold respectively, the initial injection value is determined by the accumulated value of the second injection parameter or the first injection parameter.

3. The composite processing system according to claim 2, characterized in that: The second injection parameter is twice the first injection parameter.

4. The composite processing system according to claim 3, characterized in that: The initial injection value is 0, and the first injection parameter and the second injection parameter are both greater than 0.

5. The composite processing system according to claim 1, characterized in that: The first agent injection amount is the injection amount of the first agent, and the first agent is sodium hydroxide or calcium hydroxide.

6. The composite processing system according to claim 5, characterized in that: The second agent injection amount is the injection amount of the second agent, and the second agent is sodium carbonate.

7. The composite processing system according to claim 1, characterized in that: The first drug threshold, the second drug threshold, the temperature parameter threshold, and the reference injection threshold are stored in a controller.

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