Control method of low-voltage equipment and low-voltage equipment

Abstract

The invention discloses a control method of low-pressure equipment and the low-pressure equipment, and relates to the field of oil gas. According to the control method of the low-pressure equipment, the low-pressure equipment comprises sand mixing equipment, mixing equipment, sand conveying equipment, tank equipment and a manifold; the control method comprises the steps that fracturing construction design data are received, and the fracturing construction design data comprise fracturing key parameters of all fracturing stages in the fracturing process; performing linkage control on the sand mixing equipment, the mixing equipment, the sand conveying equipment, the tank body equipment and the manifold according to the fracturing key parameters of each fracturing stage; and according to the sand supply amount and / or the liquid supply amount, the low-pressure equipment is controlled to automatically switch the fracturing stage. According to the invention, at least one of the problems of high manual operation requirement, high labor intensity and safety risk can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas, and specifically relates to a control method for low-pressure equipment and low-pressure equipment. Background Art

[0002] In the process of increasing the production of oil and gas fields, multiple equipments are involved in the construction at the same time. The command personnel in the instrument concentrate on commanding the sand mixing, blending, sand transport, liquid tanks, and manifold valve equipment in the low-pressure area. The operators on each equipment perform manual operations and cooperate with each other to complete the operation in the low-pressure area. However, as the scale of development of shale oil and shale gas increases, the number of equipment gradually increases, the technical requirements for command and operation personnel become higher, the labor intensity is greater, the management cost of personnel is higher, and the risk factors increase. Therefore, a control method with a high degree of automation is urgently needed. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a control method for low-voltage equipment and low-voltage equipment, which can solve at least one of the problems of high manual operation requirements, high labor intensity, and safety risks.

[0004] In order to solve the above technical problems, this application is implemented as follows: The embodiment of the present application provides a control method for low-pressure equipment, wherein the low-pressure equipment includes sand mixing equipment, mixing equipment, sand conveying equipment, tank equipment and manifold; The control method comprises: Receiving fracturing construction design data, wherein the fracturing construction design data includes key fracturing parameters of each fracturing stage in the fracturing process; According to the key fracturing parameters of each fracturing stage, the sand mixing equipment, the mixing equipment, the sand transporting equipment, the tank equipment and the manifold are respectively controlled in linkage; According to the sand supply and / or liquid supply, the low-pressure equipment is controlled to automatically switch the fracturing stage.

[0005] The embodiment of the present application further provides a low-pressure device, using the control method of the low-pressure device, the low-pressure device includes: sand mixing equipment, mixing equipment, sand conveying equipment, tank equipment, manifold, control system and decision system, wherein the tank equipment includes a liquid tank and an additive tank; The sand mixing equipment, the compounding equipment, the sand transporting equipment, the first valve provided on the manifold, the second valve provided on the liquid tank, and the third valve provided on the additive tank are all electrically connected to the control system; The control system is electrically connected to the decision system.

[0006] The embodiments of the present application can realize intelligent linkage control through the coordination of structures such as sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment, manifold and the like. The sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment, manifold and the like are linked and controlled according to the key fracturing parameters of each fracturing stage in the fracturing process, and then automatic switching operations between the stages are realized according to at least one of the sand supply and the liquid supply, thereby effectively alleviating the problem of lack of coordination between the commander and the operator, which is conducive to improving operation efficiency, reducing the investment of manpower and material resources, and reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A flow chart of a control method for a low-voltage device disclosed in an embodiment of the present application; Figure 2 This is a control logic diagram of the control system disclosed in the embodiment of the present application. DETAILED DESCRIPTION

[0008] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0009] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0010] The embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0011] refer to Figure 1 and Figure 2 The embodiment of the present application discloses a control method for low-voltage equipment, which is used to control the low-voltage equipment so that various working parts of the low-voltage equipment can be linked. The low-voltage equipment may include sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifolds, thereby unified command and linkage control of the sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifolds can be performed.

[0012] It should be noted here that the area of ​​​​the fracturing operation can be divided into a high-pressure area and a low-pressure area. The equipment located in the high-pressure area is the high-pressure equipment, such as a fracturing truck, etc., through which high-pressure fracturing fluid can be injected into the formation; the equipment located in the low-pressure area is the low-pressure equipment, such as sand mixing equipment, mixing equipment, water tanks, etc., all of which are used to provide material for the equipment in the high-pressure area. The embodiment of the present application is mainly for the linkage control of the equipment located in the low-pressure area, so as to improve the stability and efficiency of the operation.

[0013] The disclosed control method includes: Receiving fracturing construction design data, wherein the fracturing construction design data includes key fracturing parameters of each fracturing stage in the fracturing process; According to the key fracturing parameters of each fracturing stage, the sand mixing equipment, mixing equipment, sand transport equipment, pipe equipment and manifold are controlled in linkage; According to the amount of sand and / or fluid supplied, the low-pressure equipment is controlled to automatically switch the fracturing stage.

[0014] The embodiments of the present application can realize intelligent linkage control through the coordination of structures such as sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment, manifold and the like. The sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment, manifold and the like are linked and controlled according to the key fracturing parameters of each fracturing stage in the fracturing process, and then automatic switching operations between the stages are realized according to at least one of the sand supply and the liquid supply, thereby effectively alleviating the problem of lack of coordination between the commander and the operator, which is conducive to improving operation efficiency, reducing the investment of manpower and material resources, and reducing safety risks.

[0015] In the embodiment of the present application, the control system of the low-voltage equipment can have two modes: remote control mode and main body control mode. Before the operation starts, the operator will select the remote control mode or the local control mode according to the requirements of the operation.

[0016] Among them, the local control mode is that the control system of the low-voltage equipment itself controls the equipment information in the low-voltage area. During this process, the control system will not receive other instructions (such as instructions issued by the decision-making system, etc.), and mainly controls the operation of the equipment in the low-voltage area through the data stored in the control system.

[0017] For example, before the low-voltage equipment is operated, initial data related to the operation can be pre-stored in the control system. When the low-voltage equipment is in local control mode, the sand mixing equipment, blending equipment, sand transporting equipment, tank equipment and manifold can be controlled separately only through the control system to control the stable and coordinated operation of each equipment.

[0018] The remote control mode is that the control system of the low-voltage equipment transfers the command authority to other systems (such as decision-making systems, etc.), and the control system, as the command transmission part, can receive commands sent by other systems and control the sand mixing equipment, blending equipment, sand transporting equipment, tank equipment and manifolds respectively according to the received commands, so as to control the stable and coordinated operation of each equipment.

[0019] Optionally, after selecting the remote control mode, the control system of the low-voltage equipment listens to the instructions issued by the decision-making system. After the control system receives the instructions issued by the decision-making system, the control system will lock the main control instructions and only retain basic parameter modification instructions. The control system will modify the corresponding parameters in the control system according to the basic parameter modification instructions to achieve parameter updates.

[0020] In addition, the control system can unilaterally interrupt control with the decision-making system. After the interruption, the control system will not receive any instructions from the decision-making system.

[0021] Optionally, construction data can be imported into the decision-making system, for example, by manual input or other input methods. The decision-making system analyzes and processes the construction data and forms corresponding control instructions. The control instructions are then sent to the control system of the low-voltage equipment, so that the control system can control the equipment in the low-voltage area to operate in the corresponding situation according to the control instructions of the decision-making system.

[0022] According to the different control modes of low-pressure equipment, the issuer of fracturing construction design data received by the control system is different, specifically: Receiving the fracturing construction design data, including: when the control system of the low-pressure device is in a remote control mode, receiving the fracturing construction design data issued by the decision system of the low-pressure device, and the control system monitors the control instructions issued by the decision system, and locks at least part of the control instructions, and retains basic parameter modification instructions; When the control system of the low-pressure equipment is not in the remote control mode (ie, in the main control mode), the local fracturing construction design data is received through the control system, and the control system does not receive the control instructions issued by the decision-making system.

[0023] Optionally, after the step of receiving the fracturing construction design data and before the step of performing the linkage control, the control method further includes: According to the working conditions of the fracturing operation, information binding is performed between the key fracturing parameters and at least part of the low-pressure equipment.

[0024] Based on the above settings, it is possible to achieve mutual association between the key fracturing parameters and at least part of the equipment bound with the information, so that after selecting the key fracturing parameters, the corresponding equipment can be directly controlled to operate according to the key fracturing parameters without the need to control the operation of related equipment separately, thereby achieving integrated control, simplifying control logic, and reducing control complexity.

[0025] For example, if the first set of critical fracturing parameters is selected, the operation of the corresponding equipment can be directly controlled according to the first set of critical fracturing parameters.

[0026] Optionally, the critical fracturing parameters include at least one of sand concentration, sand type, liquid concentration, liquid type, additive concentration, and additive type.

[0027] Optionally, binding information of the key fracturing parameters with at least part of the low-pressure equipment may include: The sand type is respectively bound with the number of the sand mixing equipment and the number of the sand conveying equipment. Based on this, the operation of the sand mixing equipment with the corresponding number and the operation of the sand conveying equipment with the corresponding number can be controlled according to the sand type.

[0028] For example, the No. 1 sand mixer and the No. 1 sand conveyor are used to mix and convey the first type of sand, respectively; the No. 2 sand mixer and the No. 2 sand conveyor are used to mix and convey the second type of sand, respectively. When the first type of sand is selected during the fracturing operation, the No. 1 sand mixer and the No. 1 sand conveyor are controlled to operate to achieve the mixing and conveying of the first type of sand; similarly, when the second type of sand is selected during the fracturing operation, the No. 2 sand mixer and the No. 2 sand conveyor are controlled to operate to achieve the mixing and conveying of the second type of sand.

[0029] Optionally, binding information of the key fracturing parameters with at least part of the low-pressure equipment may further include: The liquid type is bound to the number of the liquid tank included in the tank equipment. Based on this, the operation of the liquid tank with the corresponding number can be controlled according to the liquid type to facilitate the transportation of the corresponding liquid.

[0030] For example, the first type of liquid may be contained in the No. 1 liquid tank, and the second type of liquid may be contained in the No. 2 liquid tank. When the first type of liquid is selected during the fracturing operation, the No. 1 liquid tank is controlled to operate to output the first type of liquid; similarly, when the second type of liquid is selected during the fracturing operation, the No. 2 liquid tank is controlled to operate to output the second type of liquid.

[0031] Optionally, binding information of the key fracturing parameters with at least part of the low-pressure equipment may further include: The additive type is bound to the liquid type, based on which the corresponding liquid type can be adapted according to the additive type.

[0032] For example, when the first type of additive is selected during the fracturing operation, the first type of liquid is selected accordingly; similarly, when the second type of additive is selected during the fracturing operation, the second type of liquid is selected accordingly.

[0033] Optionally, binding information of the key fracturing parameters with at least part of the low-pressure equipment may further include: The type of additive is bound to the number of the delivery pump, based on which the operation of the delivery pump with the corresponding number can be controlled according to the type of additive.

[0034] For example, the No. 1 delivery pump is used to deliver the first type of additives; the No. 2 delivery pump is used to deliver the second type of additives. When the first type of additives is selected during the fracturing operation, the No. 1 delivery pump is controlled to operate to achieve the delivery of the first type of additives; similarly, when the second type of additives is selected during the fracturing operation, the No. 2 delivery pump is controlled to operate to achieve the delivery of the second type of additives.

[0035] Optionally, there may be a binding relationship between the sand mixing equipment, the sand tank, and the sand type. For example, three augers and three sand tanks are numbered A, B, and C, and the three sand tanks are numbered tank 1, tank 2, and tank 3. Among them, tank 1 stores 70 / 140 quartz sand and is transported to the mixing tank by auger A, so the binding relationship is 70 / 140 quartz sand-tank 1-auger A.

[0036] After the binding is completed, in the subsequent operation, the sand type in the stage (such as 70 / 140 quartz sand, etc.) is used to control tank 1 to open the valve to discharge sand and control auger A to transport sand to the mixing tank.

[0037] Optionally, there may be a binding relationship between the liquid and the manifold valve, for example, the slippery water comes from the water tank and the guar gum liquid comes from the liquid tank. When the water tank valve is opened and the liquid tank valve is closed, the slippery water is released into the sand mixing equipment; when the liquid tank valve is opened and the water tank valve is closed, the guar gum liquid is released into the sand mixing equipment.

[0038] Optionally, additives are bound to liquids. For example, if you need to configure slick water, you need to add a drag reducer; if you need to configure guar liquid, you need to add a gel breaker; when switching liquid types, the proportion of additives is controlled according to the name of the liquid.

[0039] Optionally, the additive is bound to a delivery pump. Due to the differences in sand mixing equipment, the delivery pumps bound to the same additive may be different, for example, the drag reducer in sand mixing equipment 1 is bound to delivery pump 5, and the drag reducer in sand mixing equipment 2 is bound to delivery pump 4.

[0040] For the above binding information, please refer to Table 1 to Table 4.

[0041] Table 1 Binding relationship between proppant, auger and sand tank

[0042] Table 2 Binding relationship between liquid, additive and delivery pump

[0043] Table 3 Binding relationship between liquid and valve

[0044] Table 4 Parameter settings in follow displacement mode

[0045] In an embodiment of the present application, before the operation, the control system of the low-voltage equipment can configure and bind at least part of the equipment information according to the working conditions of the operation; during the formal operation, if only liquid is pumped in the current stage, the stage can be switched according to the actual accumulated liquid volume value. If sand is pumped in the current stage, the stage is jumped according to the actual accumulated sand volume value, as shown in Table 5.

[0046] Table 5

[0047] Optionally, according to at least one of the sand supply amount and the liquid supply amount, controlling the low-pressure equipment to automatically switch the fracturing stage includes: When the fracturing stage is in the pumping stage, when the actual cumulative pumping volume is greater than the set cumulative pumping volume, the pumping stage automatically switches to the next fracturing stage; Alternatively, when the fracturing stage is in the sand pumping stage, when the actual cumulative sand pumping amount is greater than the preset cumulative sand pumping amount, the sand pumping stage is automatically switched to the next fracturing stage.

[0048] Based on the above steps, the automatic switching of the fracturing stages of the low-pressure equipment can be achieved without human intervention, thereby improving the operating efficiency of the low-pressure equipment and not introducing errors caused by human factors, thereby reducing the operating errors of the low-pressure equipment.

[0049] Optionally, referring to Table 5, if there is no sand in stage 1, when the actual cumulative liquid volume value is greater than the planned cumulative liquid volume value, it will automatically switch from stage 1 to stage 2; if there is sand in stage 2, when the actual cumulative sand volume value is greater than the planned cumulative sand volume value, it will automatically switch from stage 2 to stage 3.

[0050] Optionally, according to the key fracturing parameters of each fracturing stage, the sand mixing equipment, the mixing equipment, the sand transporting equipment, the tank equipment and the manifold are controlled in linkage, including: According to the current operating mode of the low-pressure equipment, the sand concentration or sand ratio of the sand mixing equipment is controlled.

[0051] For example, when the low-pressure equipment is currently in the first operating mode, the sand concentration of the sand mixing equipment can be controlled to be the first sand concentration or the sand ratio can be controlled to be the first sand ratio; when the low-pressure equipment is currently in the second operating mode, the sand concentration of the sand mixing equipment can be controlled to be the second sand concentration or the sand ratio can be controlled to be the second sand ratio.

[0052] Optionally, the control system of the low-voltage equipment in the embodiment of the present application can support four types of on-site single sand mixing operation mode, double sand mixing operation mode, single sand mixing + liquid supply operation mode, and double sand mixing + liquid supply operation mode. Depending on different configurations, the on-site operation modes will also be different.

[0053] In the first embodiment, when the low-pressure equipment is currently in a single sand mixing operation mode, the sand mixing equipment, the sand transporting equipment and the liquid tank included in the tank equipment are respectively controlled in linkage according to the fracturing construction design data so that the sand concentration or sand ratio corresponds to the fracturing construction design data.

[0054] In the second implementation mode, when the low-pressure equipment is currently in the dual sand mixing operation mode, the sand mixing equipment, the sand transporting equipment and the liquid tank included in the tank equipment are respectively controlled in linkage according to the fracturing construction design data so that the sand concentration or sand ratio corresponds to the fracturing construction design data.

[0055] In addition, in the single sand mixing operation mode or the double sand mixing operation mode, automatic operation can be achieved completely in accordance with the construction design, and the sand concentration or sand ratio is consistent with the construction design.

[0056] In a third embodiment, when the low-pressure equipment is currently in a single sand mixing + fluid supply operation mode, the sand concentration or sand ratio of the sand mixing equipment is controlled to increase and the output displacement of the fracturing fluid is controlled to remain unchanged, or the output displacement of the fracturing fluid is controlled to increase and the sand concentration is controlled to remain unchanged.

[0057] In a fourth embodiment, when the low-pressure equipment is currently in a dual sand mixing + fluid supply operation mode, the sand concentration or sand ratio of the sand mixing equipment is controlled to increase and the output displacement of the fracturing fluid is controlled to remain unchanged, or the output displacement of the fracturing fluid is controlled to increase and the sand concentration is controlled to remain unchanged.

[0058] In addition, in the single sand mixing + liquid supply operation mode or the double sand mixing + liquid supply operation mode, since the liquid supply equipment cannot produce sand, the amount of sand corresponding to the displacement of the liquid supply equipment will be completed by the sand mixing equipment.

[0059] Alternatively, under normal circumstances, the output displacement can be controlled by increasing the sand concentration or sand ratio of the sand mixing equipment.

[0060] In some embodiments, the displacement may be kept constant while the sand concentration is increased.

[0061] For example, in the dual sand mixing + liquid supply operation mode, the displacement of the sand mixing device 1 is m, the displacement of the sand mixing device 2 is n, the displacement of the liquid supply device is p, the operating sand concentration is k, and the actual sand mixing device set sand concentration is j. Based on this, the sand mixing device set sand concentration j = (m + n + p) / (m + n) * k.

[0062] In addition, some areas need to collect the actual sand concentration curve in real time. The sand concentration collected by the above method does not match the actual situation. The sand mixing equipment is needed to simulate the uniform distribution of the displacement of the liquid supply equipment to keep the sand concentration unchanged.

[0063] Based on the above situation, a method can be adopted in which the sand concentration remains unchanged and the discharge volume is increased.

[0064] For example, in the dual sand mixing + liquid supply operation mode, the displacement of sand mixing equipment 1 is m, the displacement of sand mixing equipment 2 is n, the displacement of the liquid supply equipment is p, the operating sand concentration is k, and the actual sand mixing equipment set sand concentration is j. Based on this, the displacement of sand mixing equipment 1 is set to m=m+(p / 2), and the displacement of sand mixing equipment 2 is set to n=n+(p / 2).

[0065] Optionally, controlling the additive tank included in the tank equipment includes: When the fracturing stage is switched to the additive supply stage, the additive tank is controlled to output a preset amount of additive; Alternatively, in the case where the additive type is informationally bound to the liquid type, when the fracturing stage is switched to the liquid supply stage, the additive tank is controlled to output a preset amount of additive.

[0066] Among them, the additive can be operated in two ways, the first is to follow the stage operation, and the second is to follow the liquid displacement.

[0067] When the additive is operated in a follow-up stage mode, the parameter information of the delivery pump is set in the construction design, and the amount of the additive can be directly set when switching between execution stages.

[0068] When the additive follows the liquid displacement, the additive parameters need to be configured in advance, and the minimum displacement of the additive and the thousandth of the displacement need to be set.

[0069] In addition, after the additives are bound to the liquid, when switching the liquid, the ratio of the additives can be set according to the following formula.

[0070] For example, the minimum allowable displacement value of the additive is set to n1, the thousandth coefficient of the additive is k1, the actual displacement of the sand mixing equipment is set to m1, and the actual displacement of the additive is p1.

[0071] When m1>n1, p1=m1*k1 / 1000; When m1<n1, p1=0.

[0072] like Figure 1 As shown, the process of the control method of the low-voltage equipment in the embodiment of the present application is: First, the construction design is carried out to obtain the fracturing construction design data; Determine the control mode of the low voltage device, that is, whether it is in remote control mode or local control mode; When the low-pressure equipment is in remote control mode, the fracturing construction design data can be imported into the decision-making system, and the fracturing construction design data can be analyzed and processed by the decision-making system to obtain control instructions; The decision-making system sends the control instruction to the server, and the server determines whether data backup is required. If data backup is required, the server will back up the data first, and then forward the control instruction to the control system through the server. If data backup is not required, the server will directly forward the control instruction to the control system. After receiving the control instructions, the control system analyzes and processes the control instructions to form multiple control linkage instructions, which are respectively sent to the sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifold, thereby realizing linkage control of the sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifold to ensure that each equipment can operate smoothly and output liquid that meets the fracturing requirements.

[0073] Of course, the control system can also feed back alarm information, parameter information, etc. to the decision-making system to form a closed-loop control. In addition, the control system can first feed back alarm information, parameter information, etc. to the server, and confirm through the server whether data backup is required. If data backup is required, the server will forward the feedback information to the decision-making system after backing up the data; if data backup is not required, the server will directly forward the feedback information to the decision-making system.

[0074] When the low-pressure equipment is in the main control mode, the fracturing construction design data can be directly imported into the control system and pre-stored by the control system; During the fracturing operation, the control system can directly retrieve the pre-stored fracturing construction design data to form multiple control linkage instructions, and send them to the sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifold respectively, so as to realize the linkage control of the sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifold to ensure that each equipment can operate smoothly, so as to output liquid that meets the fracturing needs.

[0075] like Figure 2 As shown, the principle of the remote control mode or the main body control mode in the embodiment of the present application is: First, confirm whether the low-voltage equipment is in remote control mode; When the low-voltage equipment is in remote control mode, the control system monitors the control instructions of the decision-making system. If the monitoring is successful, the control system will control the sand mixing equipment, mixing equipment, sand transport equipment, tank equipment and manifold in a coordinated manner according to the monitored control instructions; When the low-voltage equipment is in local control mode, the control system directly controls the linkage of the sand mixing equipment, blending equipment, sand transporting equipment, tank equipment and manifold.

[0076] Based on the control method of the above-mentioned low-voltage equipment, an embodiment of the present application also discloses a low-voltage equipment applying the above-mentioned control method. The disclosed low-voltage equipment includes sand mixing equipment, compounding equipment, sand transporting equipment, tank equipment, manifold, control system and decision system.

[0077] Among them, the tank equipment may include a liquid tank and an additive tank; the sand mixing equipment, the mixing equipment, the sand transporting equipment and the manifold may be provided with a first valve, the liquid tank may be provided with a second valve, the additive tank may be provided with a third valve, and the first valve, the second valve and the third valve may be electrically connected to the control system, and the control system is electrically connected to the decision-making system.

[0078] Based on the above settings, the embodiment of the present application can send control instructions to the control system through the decision-making system, and control at least one of the first valve, the second valve, and the third valve to be opened or closed through the control system, so that the sand amount, liquid flow rate, and additive flow rate can be controlled accordingly to meet the requirements for sand amount, liquid flow rate, and additive flow rate during the fracturing operation.

[0079] In summary, the embodiments of the present application can simulate the manual automatic control of the sand mixing equipment, mixing equipment, sand transporting equipment, tank equipment and manifold linkage according to the construction design in a staged manner; in the single sand mixing + liquid supply and double sand mixing + liquid supply modes, the sand concentration and additive concentration are automatically allocated according to the displacement according to the needs of the operation; by binding the additive to the liquid type, the flow of the additive can be automatically controlled according to the liquid type and displacement during construction without manual operation.

[0080] In addition, in the embodiment of the present application, the control system of the low-pressure equipment integrates the control of all equipment (i.e., low-pressure equipment) in the low-pressure area of ​​the fracturing construction site. During the construction operation, the decision-making system will send the construction design instructions to the control system of the low-pressure equipment in the form of a forwarding server. After the control system receives the instructions, the control system will link and control the sand mixing equipment, mixing equipment, sand transport equipment, tank equipment and manifold, so as to achieve one-key control of all equipment in the low-pressure area. During the operation process, the control system of the low-pressure equipment will also upload the key parameters, alarms and other information data of the low-pressure equipment to the decision-making system through the forwarding server, so that the decision-making system can grasp all the information of the low-pressure area operation. In addition, the control system of the low-pressure equipment can also support four operation modes: single sand mixing, double sand mixing, single sand mixing + liquid supply, and double sand mixing + liquid supply, which meets the operation configuration requirements of most construction sites.

[0081] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A control method for low voltage equipment, characterized in that: The low-pressure equipment includes sand mixing equipment, compounding equipment, sand conveying equipment, tank equipment and manifold; The control method comprises: Receiving fracturing construction design data, wherein the fracturing construction design data includes key fracturing parameters of each fracturing stage in the fracturing process; According to the key fracturing parameters of each fracturing stage, the sand mixing equipment, the mixing equipment, the sand transporting equipment, the tank equipment and the manifold are respectively controlled in linkage; According to the sand supply and / or liquid supply, the low-pressure equipment is controlled to automatically switch the fracturing stage.

2. The control method according to claim 1, characterized in that: The receiving of the fracturing construction design data comprises: When the control system of the low-pressure device is in a remote control mode, the fracturing construction design data is received from the decision system of the low-pressure device, and the control system monitors the control instructions issued by the decision system, and locks at least part of the control instructions, retaining basic parameter modification instructions; When the control system of the low-pressure equipment is not in the remote control mode, the local fracturing construction design data is received through the control system, and the control system does not receive the control instructions issued by the decision-making system.

3. The control method according to claim 1, characterized in that: After the step of receiving the fracturing construction design data and before the step of performing linkage control, the control method further includes: According to the working conditions of the fracturing operation, information binding is performed between the key fracturing parameters and at least part of the low-pressure equipment.

4. The control method according to claim 3, characterized in that: The step of binding information of the key fracturing parameters to at least part of the low-pressure equipment includes: Binding the sand type in the key fracturing parameters with the number of the sand mixing equipment and the number of the sand transporting equipment respectively; And / or, binding the liquid type in the key fracturing parameters with the serial number of the liquid tank included in the tank equipment; And / or, binding information of the additive type and the liquid type in the critical fracturing parameters; And / or, the additive type in the critical fracturing parameters is bound to the serial number of the delivery pump.

5. The control method according to claim 1, characterized in that: The method of controlling the low-pressure equipment to automatically switch the fracturing stage according to the sand supply amount and / or the liquid supply amount includes: In the case where the fracturing stage is in the pumping stage, when the actual cumulative pumping volume is greater than the preset cumulative pumping volume, the pumping stage is automatically switched to the next fracturing stage; Alternatively, when the fracturing stage is in the sand pumping stage, when the actual cumulative sand pumping amount is greater than the preset cumulative sand pumping amount, the sand pumping stage is automatically switched to the next fracturing stage.

6. The control method according to claim 1, characterized in that: The method of controlling the sand mixing equipment, the mixing equipment, the sand transporting equipment, the tank equipment and the manifold in linkage according to the key fracturing parameters at each fracturing stage includes: The sand concentration or sand ratio of the sand mixing device is controlled according to the current operating mode of the low-pressure device.

7. The control method according to claim 6, characterized in that: When the low-pressure equipment is currently in a single sand mixing operation mode or a double sand mixing operation mode, the sand mixing equipment, the sand conveying equipment and the liquid tank included in the tank equipment are respectively controlled in linkage according to the fracturing construction design data, so that the sand concentration or the sand ratio corresponds to the fracturing construction design data.

8. The control method according to claim 6, characterized in that: When the low-pressure equipment is currently in a single sand mixing and fluid supply, or double sand mixing and fluid supply operation mode, the sand concentration or sand ratio of the sand mixing equipment is controlled to increase and the output displacement of the fracturing fluid is controlled to remain unchanged, or the output displacement of the fracturing fluid is controlled to increase and the sand concentration is controlled to remain unchanged.

9. The control method according to claim 1 or 4, characterized in that: Controlling the additive tank included in the tank equipment includes: When the fracturing stage is switched to the additive supply stage, the additive tank is controlled to output a preset amount of additive; Alternatively, in the case where the additive type is informationally bound to the liquid type, when the fracturing stage is switched to the liquid supply stage, the additive tank is controlled to output a preset amount of additive.

10. A low voltage device, using the control method according to any one of claims 1 to 9, characterized in that: The low-pressure equipment includes: sand mixing equipment, mixing equipment, sand conveying equipment, tank equipment, manifold, control system and decision-making system, wherein the tank equipment includes a liquid tank and an additive tank; The sand mixing equipment, the compounding equipment, the sand transporting equipment, the first valve provided on the manifold, the second valve provided on the liquid tank, and the third valve provided on the additive tank are all electrically connected to the control system; The control system is electrically connected to the decision system.

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