Pressure drive operation liquid supply and preparation control system

Abstract

The utility model relates to a pressure drive operation liquid supply and preparation control system, which comprises a mixing tank, a liquid supply module, a liquid discharge module, a dosing module and a control module, and is characterized in that the liquid supply module is communicated with a liquid inlet of the mixing tank and feeds water into the mixing tank; the chemical adding module is communicated with a liquid inlet of the mixing tank, and chemicals needing to be mixed are fed into the mixing tank; the liquid discharging module is communicated with a liquid outlet of the mixing tank and is used for discharging the mixed medicament in the mixing tank; and the control module performs signal transmission with the liquid supply module, the liquid discharge module and the dosing module, and controls the liquid supply flow and the liquid preparation proportion of the liquid supply module, the liquid discharge module and the dosing module. According to the utility model, the problems of liquid preparation lagging, low precision, easy flooding of a mixing tank and the like due to the fact that the displacements of a suction pump and a dosing pump are manually adjusted mainly according to the displacement of a discharge pump and the liquid level of the mixing tank in the liquid supply and preparation link of the pressure-driven operation at present are solved; the continuous and automatic liquid supply and preparation operation of pressure driving operation is realized, the liquid preparation precision is greatly improved, and the risks of flooding of the mixing tank and the like are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to shale gas, shale oil pressure drive operation technical field, specifically related to pressure drive operation liquid supply and distribution control system. BACKGROUND

[0002] Pressure drive operation refers to the petroleum development process, through the oil well injection large amount of viscous oil displacement agent and water mixed low viscosity liquid, improve the oil production of oil well one kind of stimulation, therefore the oil displacement agent mixed liquid and water are mixed in proportion large amount, it is the important link of pressure drive operation, this link can also be called pressure drive operation's liquid supply and distribution link.

[0003] At present, the liquid supply and distribution link of pressure drive operation mainly relies on manual according to the discharge displacement and the liquid level of mixing tank, manually adjusts the suction pump displacement and dosing pump displacement, there is liquid distribution lag, precision is not high, mixing tank is easy to flood irrigation etc., lead to oil and gas stimulation effect is not as expected even pressure drive operation is forced to stop. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of pressure drive operation liquid supply and distribution control system, realize pressure drive operation continuous automatic liquid supply and distribution operation.

[0005] The technical scheme adopted by the utility model is: a kind of pressure drive operation liquid supply and distribution control system, characterized by: including mixing tank, liquid supply module, liquid discharge module, dosing module and control module, the liquid supply module is communicated with the liquid inlet of mixing tank, water is sent into mixing tank;The dosing module is communicated with the liquid inlet of mixing tank, and the required mixed reagent is sent into mixing tank;The liquid discharge module is communicated with the liquid outlet of mixing tank, and the mixed reagent in mixing tank is discharged;The control module is signal transmission with liquid supply module, liquid discharge module and dosing module, controls the liquid supply flow and liquid distribution ratio of liquid supply module, liquid discharge module and dosing module.

[0006] As preferred, the liquid supply module includes a suction pump, and the liquid outlet of the suction pump is communicated with the liquid inlet of the mixing tank.

[0007] As preferred, the liquid discharge module includes a liquid discharge pump, and the liquid inlet of the liquid discharge pump is communicated with the liquid outlet of the mixing tank.

[0008] As preferred, the dosing module includes a first dosing pump and a second dosing pump arranged in parallel, and the liquid outlets of the first dosing pump and the second dosing pump are communicated with the liquid inlet of the mixing tank.

[0009] As preferred, the liquid outlets of the liquid supply module, the liquid discharge module and the dosing module are each provided with an electromagnetic flowmeter.

[0010] As preferred, the liquid outlet of the liquid discharge module is provided with a pressure sensor.

[0011] As preferred, the mixing tank is provided with a liquid level meter.

[0012] As preferred, the liquid inlet of the mixing tank is provided with an electrically controlled gate valve.

[0013] A control method of the liquid supply control system for the pressure drive operation as above, characterized in that it comprises the following steps:

[0014] S1: Real-time collection of the displacement of the suction pump of the liquid supply module, the displacement of the discharge pump of the liquid discharge module, and the displacement of the first and second dosing pumps of the dosing module, as well as the liquid level of the mixing tank;

[0015] Step S2: Setting the dosing concentration for the pressure drive operation;

[0016] Step S3: Setting the dosing distribution ratio of the first and second dosing pumps;

[0017] Step S4: Setting the operation adjustment amplitude A, A = (maximum displacement of the suction pump - maximum displacement of the operation design) / maximum displacement of the suction pump, 0 < A ≤ 10%, the larger A, the larger the adjustment amplitude;

[0018] Step S5: Setting the lowest value interval of the mixing tank liquid level as 10% to 20%, and the highest value interval of the mixing tank liquid level as 80% to 90%;

[0019] Step S6: Based on the discharge displacement of the discharge pump, the real-time liquid level of the mixing tank, the maximum liquid level of the mixing tank, the minimum liquid level of the mixing tank, the intermediate liquid level of the mixing tank, the dosing concentration, the first dosing pump ratio, the second dosing pump ratio, and the adjustment amplitude, dynamically adjusting the displacements of the suction pump, the first dosing pump, and the second dosing pump, so that the dosing concentration in the mixing tank is within the set range.

[0020] As preferred, the specific steps of S6 are:

[0021] Step S61: Obtaining the discharge displacement Dis of the discharge pump rate , and the current liquid level Y of the mixing tank Now ;

[0022] Step S62: Obtaining the set liquid level operation maximum value Y Max of the mixing tank, the set liquid level operation minimum value Y Min of the mixing tank, and calculating the liquid level operation intermediate value Y Mid＝ (Y Max+ Y Min ) / 2;

[0023] Step S63: Obtaining the dosing concentration set value DosingCon, the first dosing pump ratio Dosing Percent1 , and the second dosing pump ratio Dosing Percent2 ;

[0024] Step S64: Obtain the dosing concentration setpoint DosingCon and the first dosing pump percentage Dosing. Percent1 The second dosing pump accounts for a certain percentage of the total dosage. Percent2 ;

[0025] Step S65: Obtain the operation adjustment range value X;

[0026] Step S66: Based on Dis rate Y Now Y Max Y Min Y Mid DosingCon, Dosing Percent1 Dosing Percent1 X dynamically adjusts the discharge volume of the inhalation pump, the first dosing pump, and the second dosing pump;

[0027] When Y Now <Y Min Then the suction pump is set to discharge Suc rate The value represents the maximum output displacement after inhalation. rate1 =(Suc rate / (1-DosingCon))*Dosing Percent1 Dosing rate2 =(Suc rate / (1-DosingCon))*Dosing Percent2 The PLC calculates the suction pump set displacement Suc. rate Dosing the first dosing pump set displacement rate1 The second dosing pump is set to displace... rate2 The actual displacement of the inhalation pump, the actual displacement of the first dosing pump, and the actual displacement of the second dosing pump are controlled using a PID control algorithm to equal Suc. rate Dosing rate1 Dosing rate2 ;

[0028] When Y Min <Y Now <Y Mid -X, then Suc rate =Dis rate *(1+X)*(1-DosingCon), Dosing rate1 =Dis rate *(1+X)*DosingCon*Dosing Percent1 Dosing rate2 =Dis rate *(1+X)*DosingCon*DosingPercent2 , the PLC will calculate the suction pump set displacement Suc rate , the first dosing pump set displacement Dosing rate1 , the second dosing pump set displacement Dosing rate2 , the actual displacement of the suction pump, the actual displacement of the first dosing pump, the actual displacement of the second dosing pump are controlled in the form of PID control algorithm equal to Suc rate , Dosing rate1 , Dosing rate2 ;

[0029] When Y Mid +X>Y Now >Y Mid -X, then Suc rate =Dis rate *(1-DosingCon), Dosing rate1 =Dis rate *DosingCon*Dosing Percent1, Dosing rate2 =Dis rate *DosingCon*Dosing Percent2 , the PLC will calculate the suction pump set displacement Suc rate , the first dosing pump set displacement Dosing rate1 , the second dosing pump set displacement Dosing rate2 , the actual displacement of the suction pump, the actual displacement of the first dosing pump, the actual displacement of the second dosing pump are controlled in the form of PID control algorithm equal to Suc rate , Dosing rate1 , Dosing rate2 ;

[0030] When Y Now >Y Mid +X, then Suc rate =Dis rate *(1-X)*(1-DosingCon), Dosing rate1 =Dis rate *(1-X)*DosingCon*Dosing Percent1 , Dosing rate2 =Dis rate *(1-X)*DosingCon*Dosing Percent2 , the PLC will calculate the suction pump set displacement Suc rate , the first dosing pump set displacement Dosing rate1 , the second dosing pump set displacement Dosing rate2PID control algorithm is used to control the actual discharge volume of the suction pump, the actual discharge volume of the first dosing pump and the actual discharge volume of the second dosing pump to be equal to Suc rate , Dosing rate1 , Dosing rate2 ;

[0031] When Y Now >Y Max The control system automatically closes the suction pump, the first dosing pump and the second dosing pump to prevent the mixing tank from being flooded.

[0032] The utility model has the advantages that the utility model solves the liquid supply and distribution link of the current pressure drive operation, mainly relies on manual adjustment of the suction pump and the dosing pump discharge volume according to the discharge pump discharge volume and the mixing tank liquid level, and exists the liquid distribution lag, the low precision, the mixing tank easy to flood and so on, realizes the continuous automatic liquid supply and distribution operation of the pressure drive operation, greatly improves the liquid distribution precision, and reduces the risk such as the mixing tank flooding. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 It is the schematic diagram of the pressure drive operation liquid supply and distribution control system of the utility model;

[0034] Fig. 2 It is the control flow chart of the utility model;

[0035] In the drawing: 1, mixing tank; 2, PLC control module; 3, suction pump; 4, discharge pump; 5, first dosing pump; 6, second dosing pump; 7, liquid level meter; 8, electric control gate valve; 9, pressure sensor; 10, electromagnetic flowmeter. DETAILED DESCRIPTION

[0036] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, and obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0037] For example, Figs. 1-2As shown, the pressure drive operation liquid supply and proportioning control system comprises a mixing tank 1, a liquid supply module, a liquid discharge module, a dosing module and a control module, the liquid supply module is communicated with the liquid inlet of the mixing tank 1 to send water into the mixing tank 1, the dosing module is communicated with the liquid inlet of the mixing tank 1 to send the required mixed medicament into the mixing tank 1, the liquid discharge module is communicated with the liquid outlet of the mixing tank 1 to discharge the mixed medicament in the mixing tank 1, and the control module is signal-transmitted with the liquid supply module, the liquid discharge module and the dosing module to control the liquid supply flow and the liquid proportioning ratio of the liquid supply module, the liquid discharge module and the dosing module, so that the pressure drive operation can automatically and accurately supply and proportion liquid while meeting the operation requirements and not overflowing the tank.

[0038] In the embodiment, the control module adopts a PLC control module 2, the PLC control module 2 is a product produced by ALLEN BRADLEY company and the model is Compact 1769; the liquid supply module comprises a suction pump 3, the liquid outlet of the suction pump 3 is communicated with the liquid inlet of the mixing tank 1 to suck water in an external water source into the mixing tank 1, and the liquid inlet of the mixing tank 1 is preferably arranged at the top; the liquid discharge module comprises a liquid discharge pump 4, the liquid inlet of the liquid discharge pump 4 is communicated with the liquid outlet of the mixing tank 1 to discharge the mixed medicament in the mixing tank 1 into an oil well, and the liquid outlet of the mixing tank 1 is preferably arranged at the bottom.

[0039] In the embodiment, the dosing module comprises a first dosing pump 5 and a second dosing pump 6 which are arranged in parallel, the liquid outlets of the first dosing pump 5 and the second dosing pump 6 are communicated with the liquid inlet of the mixing tank 1 after being arranged in parallel, and the required mixed medicament is sent into the mixing tank 1 according to a set proportion. The first dosing pump 5 and the second dosing pump 6 can deliver different kinds of medicaments into the mixing tank 1, and the concentration of the mixed medicament in the mixing tank 1 is controlled by controlling the output displacement of the first dosing pump 5 and the second dosing pump 6.

[0040] In the embodiment, the liquid outlets of the liquid supply module, the liquid discharge module and the dosing module are all provided with electromagnetic flowmeters 10; the liquid outlet of the liquid discharge module is provided with a pressure sensor 9; the mixing tank 1 is provided with a liquid level meter 7, the liquid level meter 7 adopts a radar liquid level meter, 4-20mA electric signals are converted into liquid level signals by the PLC, the liquid in the mixing tank 1 has strong corrosiveness, if a differential pressure type liquid level meter is placed in water, the practical service life of the liquid level meter will be shortened, and the measurement data is also not accurate; and the liquid inlet of the mixing tank 1 is provided with an electrically-controlled gate valve 8.

[0041] The control method of the pressure drive operation liquid supply and proportioning control system comprises the following steps:

[0042] S1: Real-time acquisition of the displacement of the suction pump of the liquid supply module, the displacement of the discharge pump of the liquid discharge module, and the displacement of the first dosing pump and the second dosing pump of the dosing module, and the liquid level of the mixing tank;

[0043] Step S2: Set the dosing concentration for the pressure drive operation;

[0044] Step S3: Set the dosing distribution ratio of the first dosing pump and the second dosing pump;

[0045] Step S4: Set the operation adjustment range A, A=(maximum displacement of the suction pump - maximum displacement of the operation design) / maximum displacement of the suction pump, 0

[0046] Step S5: Set the lowest value range of the liquid level of the mixing tank to be 10% to 20%, and the highest value range of the liquid level of the mixing tank to be 80% to 90%;

[0047] Step S6: According to the discharge displacement of the discharge pump, the real-time liquid level of the mixing tank, the maximum liquid level of the mixing tank, the minimum liquid level of the mixing tank, the intermediate liquid level of the mixing tank, the dosing concentration, the first dosing pump ratio, the second dosing pump ratio, and the adjustment range, dynamically adjust the displacements of the suction pump, the first dosing pump, and the second dosing pump, so that the dosing concentration in the mixing tank is within the set range;

[0048] Step S61: Obtain the discharge displacement Dis rate of the discharge pump and the current liquid level Y Now of the mixing tank;

[0049] Step S62: Obtain the set liquid level operation maximum value Y Max of the mixing tank, the set liquid level operation minimum value Y Min of the mixing tank, and calculate the liquid level operation intermediate value Y Mid＝ (Y Max+ Y Min ) / 2;

[0050] Step S63: Obtain the dosing concentration set value DosingCon, the first dosing pump ratio Dosing Percent1 , and the second dosing pump ratio Dosing Percent2 ;

[0051] Step S64: Obtain the dosing concentration set value DosingCon, the first dosing pump ratio Dosing Percent1 , and the second dosing pump ratio Dosing Percent2 ;

[0052] Step S65: Obtain the operation adjustment range value X;

[0053] Step S66: According to Dis rate , Y Now , Y Max, Y Min , Y Mid , DosingCon, Dosing Percent1 , Dosing Percent1 , X dynamically adjust the discharge displacement of the suction pump, the first dosing pump, the second dosing pump;

[0054] When Y Now <Y Min , the suction pump set displacement Suc rate is equal to the maximum output displacement of the suction pump, and the first dosing pump set displacement Dosing rate1 and the second dosing pump set displacement Dosing rate are equal to 0. Percent1 , the suction pump set displacement Suc rate2 is equal to the maximum output displacement of the suction pump, and the first dosing pump set displacement Dosing rate and the second dosing pump set displacement Dosing Percent2 are equal to 0. rate , the suction pump set displacement Suc rate1 , the first dosing pump set displacement Dosing rate2 , and the second dosing pump set displacement Dosing rate are equal to the calculated values, and the actual displacement of the suction pump, the actual displacement of the first dosing pump, and the actual displacement of the second dosing pump are controlled to be equal to Suc rate1 , Dosing rate2 ;

[0055] When Y Min <Y Now <Y Mid -X, Suc rate =Dis rate *(1+X)*(1-DosingCon), Dosing rate1 =Dis rate *(1+X)*DosingCon*Dosing Percent1 , Dosing rate2 =Dis rate *(1+X)*DosingCon*Dosing Percent2 , the suction pump set displacement Suc rate , the first dosing pump set displacement Dosing rate1 , and the second dosing pump set displacement Dosing rate2 are equal to the calculated values, and the actual displacement of the suction pump, the actual displacement of the first dosing pump, and the actual displacement of the second dosing pump are controlled to be equal to Suc rate , Dosing rate1 , Dosing rate2 ;

[0056] When Y Mid +X>Y Now >Y Mid -X, then Suc rate =Dis rate *(1-DosingCon), Dosing rate1 =Dis rate *DosingCon*Dosing Percent1, Dosing rate2 =Dis rate *DosingCon*Dosing Percent2 , the PLC will calculate the suction pump set volume Suc rate , the first dosing pump set volume Dosing rate1 , the second dosing pump set volume Dosing rate2 , the PID control algorithm in the form of control of the actual volume of suction pump, the actual volume of the first dosing pump, the actual volume of the second dosing pump equal to Suc rate , Dosing rate1 , Dosing rate2 ;

[0057] When Y Now >Y Mid +X, then Suc rate =Dis rate *(1-X)*(1-DosingCon), Dosing rate1 =Dis rate *(1-X)*DosingCon*Dosing Percent1 , Dosing rate2 =Dis rate *(1-X)*DosingCon*Dosing Percent2 , the PLC will calculate the suction pump set volume Suc rate , the first dosing pump set volume Dosing rate1 , the second dosing pump set volume Dosing rate2 , the PID control algorithm in the form of control of the actual volume of suction pump, the actual volume of the first dosing pump, the actual volume of the second dosing pump equal to Suc rate , Dosing rate1 , Dosing rate2 ;

[0058] When Y Now >Y Max The control system automatically closes the suction pump, the first dosing pump and the second dosing pump to prevent the mixing tank from flooding.

[0059] It should be noted that the above technical solutions are exemplary, the present specification can be embodied in different forms, and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the present utility model disclosure be thorough and complete, and will fully convey the scope disclosed by the present specification to those skilled in the art. In addition, the technical solutions of the present utility model are limited only by the scope of the claims.

[0060] Finally, it should be noted that the above embodiments are only representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments, and there can be many variations. Any simple modification, equivalent change and modification made according to the technical essence of the present utility model to the above embodiments shall be considered to fall within the protection scope of the present utility model.

Claims

1. A pressure-driven fluid supply and distribution control system, characterized in that: The system includes a mixing tank, a liquid supply module, a liquid discharge module, a chemical dosing module, and a control module. The liquid supply module is connected to the inlet of the mixing tank to deliver water into the mixing tank. The chemical dosing module is also connected to the inlet of the mixing tank to deliver the required chemical mixture into the mixing tank. The liquid discharge module is connected to the outlet of the mixing tank to discharge the mixed chemical mixture from the mixing tank. The control module transmits signals to the liquid supply module, the liquid discharge module, and the chemical dosing module to control the liquid supply flow rate and the liquid mixing ratio of the liquid supply module, the liquid discharge module, and the chemical dosing module. The liquid supply module includes a suction pump, the outlet of which is connected to the inlet of the mixing tank; the liquid discharge module includes a discharge pump, the inlet of which is connected to the outlet of the mixing tank. The dosing module includes a first dosing pump and a second dosing pump connected in parallel. After the first dosing pump and the second dosing pump are connected in parallel, their outlets are connected to the inlet of the mixing tank. According to a set ratio, the required mixed agent is delivered into the mixing tank. The first dosing pump and the second dosing pump can deliver different types of agents into the mixing tank. By controlling the output flow rate of the first dosing pump and the second dosing pump, the concentration of the mixed agent in the mixing tank is controlled.

2. The pressure-driven operation fluid supply and distribution control system according to claim 1, characterized in that: The liquid supply module, liquid drainage module, and dosing module are all equipped with electromagnetic flow meters at their outlets.

3. The pressure-driven operation fluid supply and distribution control system according to claim 1, characterized in that: The outlet of the drainage module is equipped with a pressure sensor.

4. The pressure-driven operation fluid supply and distribution control system according to claim 1, characterized in that: The mixing tank is equipped with a level gauge.

5. The pressure-driven operation fluid supply and distribution control system according to claim 1, characterized in that: The mixing tank inlet is equipped with an electrically controlled gate valve.

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