Powder-based system fracturing fluid preparation self-adaptive control method, terminal and storage medium

Abstract

The application provides a self-adaptive control method for fracturing fluid preparation based on a powder-based system, constructs a self-adaptive control system for fluid preparation, divides fracturing fluid preparation into multiple operation stages according to the types of fracturing fluid preparation, establishes an operation stage library, inputs the parameters of each operation stage into the operation stage library for one-to-one correspondence, sets corresponding names for the base fluid tanks and dry powder tanks based on the requirements of the operation stage library, configures corresponding base fluids and dry powders, switches the current operation stage library based on the total discharge capacity of the mixing skid, adjusts the communication relationship between several groups of the dry powder tanks and the mixing skid, adjusts the communication relationship between the mixing skid and several groups of the base fluid tanks, monitors the liquid level of the base fluid tanks in real time, and adjusts the discharge capacity of the mixing skid based on the fluctuation of the liquid level of the base fluid tanks to meet the discharge capacity requirements of fracturing operations for fracturing base fluids.

Description

Technical Field

[0001] This invention relates to the field of shale gas and shale oil fracturing operations, specifically to an adaptive control method, terminal, and storage medium for fracturing fluid preparation based on a powder-based system. Background Technology

[0002] In the field of oil drilling and production, the mixing unit is one of the core equipment of the fracturing unit. During the fracturing operation, clean water and dry powder (chemical additives) are mixed evenly according to a certain concentration ratio to form a fracturing fluid with a certain viscosity value. Then, the fracturing base fluid is discharged through the discharge pump of the mixing unit and stored in the base fluid tank for use by the sand mixing unit.

[0003] With the large-scale extraction of shale oil and gas becoming routine, high-volume continuous fracturing operations have become the norm. In the traditional model, three operators are required to monitor multiple base fluid tanks, mixing skids, and powder tanks locally. They communicate with instrument control personnel via walkie-talkie to determine the fluid type and discharge volume requirements. This presents significant challenges to the labor intensity and timeliness of control, frequently leading to overflows and cavitation due to untimely inspections and control, ultimately resulting in environmental fines or even forced shutdowns of fracturing operations. Currently, while automated control has been implemented for the fluid mixing portion of powder-based fracturing operations both domestically and internationally, manual selection of the fluid type is still required. Furthermore, dynamic linkage control between the discharge volume of the mixing skid and the base fluid tank level has not been achieved. Despite increasingly larger fluid discharge volumes in current fracturing operations, overflows and cavitation remain highly likely. Summary of the Invention

[0004] This invention proposes an adaptive control method for fracturing fluid preparation based on powder-based systems to solve the technical problem of needing to manually adjust the fluid preparation type.

[0005] To address the aforementioned technical problems, this invention provides an adaptive control method for fracturing fluid preparation based on a powder-based system, comprising the following steps:

[0006] Step S1: Construct an adaptive control system for liquid supply and distribution. The adaptive control system for liquid supply and distribution includes several sets of dry powder tanks, mixing skids, and several sets of base liquid tanks. The several sets of dry powder tanks and mixing skids are openable and closable connected, and the mixing skids are openable and closable connected to the several sets of base liquid tanks.

[0007] Step S2: Divide the liquid supply and preparation operation into multiple operation stages according to the type of liquid supplied and establish an operation stage library;

[0008] Step S3: Enter the parameters of each work stage into the work stage library for one-to-one correspondence;

[0009] Step S4: Based on the requirements of the operation stage library, assign corresponding names to the base liquid tank and the dry powder tank, and configure the corresponding base liquid and dry powder.

[0010] Step S5: Based on the total discharge of the mixing skid, switch the current operation stage library, and adjust the connection relationship between several groups of dry powder tanks and mixing skids, and adjust the connection relationship between the mixing skids and several groups of base liquid tanks.

[0011] Step S6: Monitor the liquid level of the base fluid tank in real time, and adjust the discharge rate of the mixing skid based on the liquid level fluctuation of the base fluid tank to meet the discharge rate requirements of fracturing base fluid for fracturing operations.

[0012] Preferably, the base liquid tanks are configured in 16 groups.

[0013] Preferably, the parameters for each operation stage in step S3 include stage number, total discharge volume, base liquid name, dry powder type, and dry powder concentration.

[0014] Preferably, the base liquid tanks and the mixing skid are switched on and off by an electric butterfly valve.

[0015] Preferably, step S5 includes: real-time monitoring of the total discharge volume of the mixing skid; when the total discharge volume reaches the total discharge volume set by the current working stage library, switching to the next working stage library; reading the base liquid name in the next working stage library, opening the electric butterfly valve of the corresponding base liquid tank, and closing the electric butterfly valve of the base liquid tanks of the other base liquid names.

[0016] Preferably, step S5 further includes a dry powder concentration adjustment step: real-time monitoring of the suction and discharge volume of the mixing skid, and adjusting the powder type and discharge amount of the dry powder tank according to the type and concentration of dry powder in the current operation stage to achieve the required dry powder concentration.

[0017] Preferably, step S6 includes the following steps:

[0018] Step S61: Calculate the current liquid level minus the liquid level value of the previous sampling period to obtain the deviation value e(k) for the current sampling of the kth time;

[0019] Step S62: Obtain the mixing skid intake displacement as B rate And the current value M of the liquid level Now And set the working value M of the liquid level according to the liquid supply and distribution requirements. work ;

[0020] Step S63: Adjust the discharge volume H of the mixing skid based on the deviation value e(k). rate Adjustments will be made.

[0021] Preferably, step S63 includes the following steps:

[0022] 1) When M Now <M work When, then H rate = (1 + |e(k)|) * B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid;

[0023] 2) When M Now =M work When, then H rate =B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid;

[0024] 3) When M Now >M work When, then H rate = (1-|e(k)|)*B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid.

[0025] The present invention also provides a terminal, including a memory and a processor;

[0026] The memory is used to store computer programs and an adaptive control method for fracturing fluid preparation based on powder-based systems;

[0027] The processor is used to execute the computer program and the adaptive control method for fracturing fluid preparation based on powder-based system, so as to realize the above-mentioned method.

[0028] The present invention also provides a computer-readable storage medium storing computer instructions, characterized in that: the computer instructions are used to cause a processor to execute the above-described method.

[0029] The beneficial effects of this invention include at least the following: it effectively solves the problems of overflow and cavitation caused by high labor intensity and poor control timeliness in continuous fracturing operations based on powder-based fracturing fluid preparation with large displacement; it greatly reduces the labor intensity of personnel and significantly improves the continuity and safety of fracturing operations; and the fluid preparation adaptive control system, supported by the control method, can adapt to the requirements of fracturing fluid type and displacement during the operation according to the needs of the fracturing process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the method flow according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the adaptive control system structure according to an embodiment of the present invention;

[0032] Figure 3This is a schematic diagram of the adaptive calculation logic for the intake displacement of the blended skid in an embodiment of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0034] like Figure 1 As shown, this embodiment of the invention provides an adaptive control method for fracturing fluid preparation based on a powder-based system, comprising the following steps:

[0035] Step S1: Construct an adaptive control system for liquid supply and distribution. The adaptive control system for liquid supply and distribution includes several sets of dry powder tanks, mixing skids, and several sets of base liquid tanks. The several sets of dry powder tanks and mixing skids can be opened and closed connected, and the mixing skids and several sets of base liquid tanks can be opened and closed connected.

[0036] Specifically, adaptive control of fracturing fluid preparation, such as... Figure 2 As shown, the fracturing fluid preparation adaptive control establishes industrial internet communication with control units such as the dry powder tank, mixing skid, and multiple sets of base fluid tanks, and establishes TCP communication with the sand mixing skid remote control system to obtain the sand intake and discharge rate in real time. For example, in this embodiment of the invention, 16 sets of base fluid tanks are configured.

[0037] Step S2: Divide the liquid supply and preparation operation into multiple operation stages according to the type of liquid supply and preparation, and establish an operation stage library.

[0038] Specifically, a library of operational stages based on fracturing fluid preparation processes using powder-based systems is created, dividing the fluid preparation process into multiple operational stages, up to 100 stages, with stage number, total discharge volume, base fluid name, dry powder type, and dry powder concentration.

[0039] Step S3: Enter the parameters of each task stage into the task stage library for one-to-one correspondence.

[0040] Step S4: Based on the requirements of the work phase library, set corresponding names for the base liquid tank and dry powder tank, and configure the corresponding base liquid and dry powder.

[0041] Specifically, multiple groups of base fluid tanks are grouped and named. During fracturing operations, base fluid tanks are typically used to store fracturing fluids such as potassium chloride, high-viscosity fluids, and low-viscosity fluids.

[0042] Step S5: Based on the total discharge of the mixing skid, switch the current operation stage library and adjust the connection relationship between several groups of dry powder tanks and the mixing skid, and adjust the connection relationship between the mixing skid and several groups of base liquid tanks.

[0043] Specifically, the total discharge volume of the mixing skid is monitored in real time. When the total discharge volume reaches the set discharge volume of the current working stage, the system switches to the next working stage. The system reads the base liquid name in the next working stage, opens the electric butterfly valve of the corresponding base liquid tank, and closes the electric butterfly valves of the base liquid tanks of the other base liquid names.

[0044] The suction and discharge volume of the mixing skid is monitored in real time. Based on the type and concentration of dry powder in the warehouse at the current operation stage, the type and amount of dry powder discharged from the dry powder tank are adjusted to meet the dry powder concentration requirements.

[0045] Step S6: Monitor the liquid level of the base fluid tank in real time, and adjust the discharge rate of the mixing skid based on the liquid level fluctuation of the base fluid tank to meet the discharge rate requirements of fracturing base fluid for fracturing operations.

[0046] Specifically, it includes the following steps:

[0047] Step S61: Calculate the current liquid level minus the liquid level value of the previous sampling period to obtain the deviation value e(k) for the current sampling of the kth time;

[0048] Step S62: Obtain the mixing skid intake displacement as B rate And the current value M of the liquid level Now And set the working value M of the liquid level according to the liquid supply and distribution requirements. work ;

[0049] Step S63: Adjust the discharge displacement H of the mixing skid based on the deviation value e(k). rate Adjustments are made; wherein, in this embodiment of the invention, the adjustment rules are as follows: Figure 3 As shown, it includes:

[0050] 1) When M Now <M work When, then H rate = (1 + |e(k)|) * B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid;

[0051] 2) When M Now =M work When, then H rate =B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid;

[0052] 3) When M Now >M work When, then H rate = (1-|e(k)|)*B rate The control system will calculate the mixed displacement Hrate Issued to the mixing skid.

[0053] This invention also provides a terminal, including a memory and a processor;

[0054] Memory, used to store computer programs and adaptive control methods for fracturing fluid preparation based on powder-based systems;

[0055] The processor is used to execute computer programs and adaptive control methods for fracturing fluid preparation based on powder-based systems to achieve the above methods.

[0056] This invention also provides a computer-readable storage medium storing computer instructions, characterized in that: the computer instructions are used to cause a processor to execute the above-described method.

[0057] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; only preferred embodiments of the present invention are illustrated. The descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. As long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0058] It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of this invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An adaptive control method for fracturing fluid preparation based on a powder-based system, characterized in that: Includes the following steps: Step S1: Construct an adaptive control system for liquid supply and distribution. The adaptive control system for liquid supply and distribution includes several sets of dry powder tanks, mixing skids, and several sets of base liquid tanks. The several sets of dry powder tanks and mixing skids are openable and closable connected, and the mixing skids are openable and closable connected to the several sets of base liquid tanks. Step S2: Divide the liquid supply and preparation operation into multiple operation stages according to the type of liquid supplied and establish an operation stage library; Step S3: Enter the parameters of each work stage into the work stage library for one-to-one correspondence; Step S4: Based on the requirements of the operation stage library, assign corresponding names to the base liquid tank and the dry powder tank, and configure the corresponding base liquid and dry powder. Step S5: Based on the total discharge of the mixing skid, switch the current operation stage library, and adjust the connection relationship between several groups of dry powder tanks and mixing skids, and adjust the connection relationship between the mixing skids and several groups of base liquid tanks. Step S6: Monitor the liquid level of the base liquid tank in real time, and adjust the discharge rate of the mixing skid based on the liquid level fluctuation of the base liquid tank to meet the discharge rate requirements of fracturing base liquid for fracturing operations. The parameters for each operation stage in step S3 include stage number, total discharge volume, base liquid name, dry powder type, and dry powder concentration; Several sets of the base liquid tanks and the mixing skid are switched on and off by electric butterfly valves; Step S5 includes: real-time monitoring of the total discharge volume of the mixing skid; when the total discharge volume reaches the total discharge volume set in the current working stage library, switching to the next working stage library; reading the base liquid name in the next working stage library, opening the electric butterfly valve of the corresponding base liquid tank, and closing the electric butterfly valve of the base liquid tanks of the other base liquid names. Step S5 also includes a dry powder concentration adjustment step: real-time monitoring of the suction and discharge volume of the mixing skid, and adjustment of the powder type and discharge amount of the dry powder tank according to the dry powder type and dry powder concentration in the current operation stage, so as to achieve the required dry powder concentration. Step S6 includes the following steps: Step S61: Calculate the current liquid level minus the liquid level value of the previous sampling period to obtain the deviation value e(k) for the current sampling of the kth time; Step S62: Obtain the mixing skid intake displacement as B rate And the current value M of the liquid level Now And set the working value M of the liquid level according to the liquid supply and distribution requirements. work ; Step S63: Adjust the discharge volume H of the mixing skid based on the deviation value e(k). rate Make adjustments; Step S63 includes the following steps: 1) When M Now <M work When, then H rate =(1+|e(k)|)*B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid; 2) When M Now =M work When, then H rate= B rate， The control system will calculate the mixed displacement H rate Issued to the mixing skid; 3) When M Now >M work When, then H rate = (1-|e(k)|)*B rate The control system will calculate the mixed displacement H rate Issued to the mixing skid.

2. The adaptive control method for fracturing fluid preparation based on a powder-based system according to claim 1, characterized in that: The base liquid tanks are configured in 16 groups.

3. A terminal, characterized in that: Including memory and processor; The memory is used to store computer programs and an adaptive control method for fracturing fluid preparation based on powder-based systems; The processor is used to execute the computer program and the adaptive control method for fracturing fluid preparation based on powder-based system, so as to implement the method described in any one of claims 1 to 2.

4. A computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to cause the processor to execute the method according to any one of claims 1 to 2.

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