CN114526765A - Liquid preparation system and liquid preparation method of slickwater fracturing fluid - Google Patents
Liquid preparation system and liquid preparation method of slickwater fracturing fluid Download PDFInfo
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- CN114526765A CN114526765A CN202011319733.3A CN202011319733A CN114526765A CN 114526765 A CN114526765 A CN 114526765A CN 202011319733 A CN202011319733 A CN 202011319733A CN 114526765 A CN114526765 A CN 114526765A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a liquid preparation system and a liquid preparation method of slickwater fracturing fluid, and belongs to the field of petrochemical industry. In the liquid preparation system, a drag reducer tank is provided with a first drag reducer inlet and a drag reducer outlet; the slickwater tank is provided with a second drag reducer inlet, a water inlet, a propping agent inlet and a slickwater outlet; the drag reducer outlet, the first injection pump, the first flowmeter and the second drag reducer inlet are communicated in sequence; the first drag reducer inlet, the second flowmeter, the electric control valve and the liquid discharge pipeline of the first injection pump are communicated in sequence; the water tank, the second injection pump, the third flow meter and the water inlet are communicated in sequence; the proppant tank and the proppant inlet are communicated in sequence through pipelines; the on-line viscometer is arranged on the slick water tank; the main control unit is used for controlling the opening of the electric control valve according to the viscosity of the slickwater, so that the viscosity of the slickwater reaches a set threshold value. The fluid preparation system can monitor and regulate the viscosity of the prepared slickwater fracturing fluid in real time.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to a liquid preparation system and a liquid preparation method of slickwater fracturing fluid.
Background
The slickwater is a fracturing fluid system for performing hydraulic fracturing on a shale oil and gas reservoir, has the characteristics of low damage to the permeability of a reservoir matrix and the flow conductivity of cracks and low cost, is beneficial to improving the scale of the fracturing fluid, increasing the modification volume and reducing the construction cost, and is one of effective technical means for improving the fracturing wave and volume and the fracturing effect of low-permeability and ultra-low-permeability reservoirs and shale oil reservoirs. The slick water comprises: a proppant, a drag reducer, and a disposition water, wherein the disposition water comprises: different types of water sources such as clear water, fracturing flow-back fluid, produced water and the like have different water qualities, so that when slickwater is required to be prepared on site, drag reducers with different dosages are added according to different water qualities, so that the prepared slickwater fracturing fluid reaches a designed viscosity value. Moreover, when construction pressure fluctuates in the fracturing process, the additive amount of the drag reducer in the slickwater needs to be temporarily adjusted according to the construction pressure, and the viscosity value of the prepared slickwater fracturing fluid is controlled in real time.
At present, the method for adjusting the viscosity value of slickwater fracturing fluid comprises the following steps: fracturing personnel adopt simple and easy testing arrangement, get the fracturing fluid water sample from mixing the sand jar, rely on experience to judge the viscosity height of fracturing fluid or through the viscosity of viscosimeter survey fracturing fluid through artifical observation, thereby adjust the injection discharge capacity of drag reducer input pump's rotational speed adjustment drag reducer again to the viscosity of adjustment fracturing fluid.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the viscosity of the fracturing fluid is judged manually, the error is large, the discharge capacity of the drag reducer is adjusted by adjusting the rotating speed of the drag reducer input pump, and the discharge capacity of the drag reducer is difficult to control accurately.
Disclosure of Invention
In view of the above, the present invention provides a fluid distribution system and a fluid distribution method for slickwater fracturing fluid, which can solve the above technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, an embodiment of the present invention provides a fluid preparation system for slickwater fracturing fluid, where the fluid preparation system for slickwater fracturing fluid includes: the drag reducer comprises a drag reducer tank, a first injection pump, a first flow meter, an electric control valve, a second flow meter, a slip water tank, an online viscometer, a water tank, a second injection pump, a third flow meter, a proppant tank and a main control unit;
the drag reducer canister having a first drag reducer inlet and a drag reducer outlet;
the slickwater tank is provided with a second drag reducer inlet, a water inlet, a propping agent inlet and a slickwater outlet;
the drag reducer outlet, the first injection pump, the first flow meter, and the second drag reducer inlet are in serial communication via a pipeline;
the first drag reducer inlet, the second flowmeter, the electronic control valve and the liquid discharge pipeline of the first injection pump are communicated in sequence;
the water tank, the second injection pump, the third flow meter and the water inlet are communicated in sequence through pipelines;
the proppant tank and the proppant inlet are communicated in sequence through a pipeline;
the on-line viscometer is arranged on the slickwater tank and is used for measuring the viscosity of the slickwater prepared in the slickwater tank;
the main control unit is electrically connected with the first flowmeter, the second flowmeter, the third flowmeter, the online viscometer and the electric control valve, and the main control unit is used for controlling the opening degree of the electric control valve according to the viscosity of the slickwater so as to enable the viscosity of the slickwater to reach a set threshold value.
In some possible implementations, the drain line of the first injection pump is a line between the first flow meter and the second drag reducer inlet.
In some possible implementations, a slickwater outlet on the slickwater tank communicates with a wellhead of the oil and gas well through a pump truck set.
On the other hand, the embodiment of the invention also provides a liquid preparation method of the slickwater fracturing fluid, and the liquid preparation method of the slickwater fracturing fluid adopts any one of the liquid preparation systems of the slickwater fracturing fluid.
In some possible implementations, the method for preparing the slickwater fracturing fluid comprises the following steps:
keeping the electric control valve in a closed state, starting a first injection pump to pump the drag reducer in the drag reducer tank to the slick water tank, and simultaneously starting a second injection pump to pump the prepared water in the water tank to the slick water tank and make the proppant in the proppant tank enter the slick water tank;
the drag reducer, the prepared water and the propping agent are mixed in the slickwater tank to form slickwater fracturing fluid;
measuring the actually measured viscosity value of the slickwater fracturing fluid in real time by using an online viscometer, and transmitting the actually measured viscosity value to a main control unit;
and the main control unit compares the actually measured viscosity value of the slickwater fracturing fluid with the viscosity threshold value of the slickwater fracturing fluid, and controls the opening of the electric control valve according to the comparison result so as to enable the viscosity of the slickwater to reach the set threshold value.
In some possible implementation manners, the main control unit compares the measured viscosity value of the slickwater fracturing fluid with a viscosity threshold of the slickwater fracturing fluid, and controls the opening of the electric control valve according to the comparison result, so that the viscosity of the slickwater reaches a set threshold range, including:
defining the viscosity threshold value of the slickwater fracturing fluid as a and the actually measured viscosity value of the slickwater fracturing fluid as b;
and when a is less than b, the main control unit sends a control command to the electronic control valve according to the difference value between a and b, and the opening of the electronic control valve is adjusted, so that one part of the drag reducer pumped out by the first injection pump enters the slick water tank, and the other part of the drag reducer returns to the drag reducer tank through the electronic control valve until a is equal to b.
In some possible implementation manners, the main control unit compares the measured viscosity value of the slickwater fracturing fluid with a viscosity threshold of the slickwater fracturing fluid, and controls the opening of the electric control valve according to the comparison result, so that the viscosity of the slickwater reaches a set threshold range, including:
defining the viscosity threshold value of the slickwater fracturing fluid as a and the actually measured viscosity value of the slickwater fracturing fluid as b;
and when a is larger than b, the main control unit sends a control command to the electric control valve according to the difference value between a and b, and the opening of the electric control valve is adjusted, so that the amount of the slickwater fracturing fluid returning to the drag reducer tank is reduced, and the amount of the drag reducer entering the slickwater tank is increased until a is equal to b.
In some possible implementation manners, when construction pressure fluctuation occurs in the fracturing process by using the slickwater fracturing fluid and the construction pressure value is increased, the main control unit automatically adjusts the viscosity threshold value of the slickwater fracturing fluid to be smaller;
and the main control unit sends a control instruction to the electric control valve to reduce the opening of the electric control valve, so that the drag reduction amount returned to the drag reduction agent tank through the electric control valve is reduced, the amount of the drag reduction agent entering the slickwater tank is increased, and the viscosity value of the prepared slickwater fracturing fluid is reduced until the viscosity value is equal to the viscosity threshold value of the reconfigured slickwater fracturing fluid.
In some possible implementations, the flow rate of the drag reducer pumped by the first injection pump is measured in real time with a first flow meter and transmitted to a master control unit while the slickwater fracturing fluid is being formulated;
the master control unit determines an amount of drag reducer to discharge from the drag reducer canister based on the flow rate of drag reducer.
In some possible implementations, when the slickwater fracturing fluid is prepared, the flow rate of water pumped out by the second injection pump is measured in real time by using a third flow meter and is transmitted to the main control unit;
and the main control unit determines the amount of water discharged by the water tank according to the flow rate of the water.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the fluid preparation system of the slickwater fracturing fluid provided by the embodiment of the invention can be used for monitoring and controlling the viscosity of the prepared slickwater fracturing fluid in real time. During application, the electric control valve is kept in a closed state, the first injection pump is started to pump the drag reducer in the drag reducer tank to the slickwater tank, and meanwhile, the second injection pump is started to pump the configured water in the water tank to the slickwater tank and make the proppant in the proppant tank enter the slickwater tank. Mixing drag reducer, prepared water and proppant in a slickwater tank to form slickwater fracturing fluid, measuring the actually measured viscosity value of the slickwater fracturing fluid in real time by using an online viscometer, and transmitting the actually measured viscosity value to a main control unit; the main control unit compares the actually measured viscosity value of the slickwater fracturing fluid with the viscosity threshold value of the slickwater fracturing fluid, and controls the opening of the electric control valve according to the comparison result, so that the viscosity of the slickwater reaches the set threshold value.
Therefore, by using the fluid preparation system of the slickwater fracturing fluid provided by the embodiment of the invention, the actually measured viscosity value of the slickwater fracturing fluid is fed back to the main control unit in real time through the online viscometer, so that the continuous monitoring of the viscosity value of the slickwater fracturing fluid is realized. The main control unit adjusts the opening of the electric control valve in real time, so that the amount of the drag reducer entering the slickwater tank is adjusted, and the viscosity value of the prepared slickwater fracturing fluid is adjusted in real time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a fluid preparation system of an exemplary slickwater fracturing fluid according to an embodiment of the present invention.
The reference numerals denote:
1-a drag reducer can, wherein the drag reducer can,
2-a first injection pump, and a second injection pump,
3-the first flow meter is arranged on the first flow meter,
4-an electric control valve is arranged on the upper portion of the shell,
5-the flow rate of the second flow meter,
6-a water slipping tank is arranged on the upper portion of the water tank,
7-an in-line viscometer,
8-the water tank is arranged in the water tank,
9-a second infusion pump, the infusion pump,
10-a third flow meter, wherein,
11-a proppant tank, wherein the proppant tank is provided with a proppant inlet,
12-the master control unit,
13-a group of pump cars,
14-well head.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
In one aspect, an embodiment of the present invention provides a fluid preparation system for slickwater fracturing fluid, as shown in fig. 1, the fluid preparation system for slickwater fracturing fluid includes: the drag reducer comprises a drag reducer tank 1, a first injection pump 2, a first flow meter 3, an electronic control valve 4, a second flow meter 5, a slick water tank 6, an online viscometer 7, a water tank 8, a second injection pump 9, a third flow meter 10, a proppant tank 11 and a main control unit 12.
The drag reducer tank 1 is provided with a first drag reducer inlet and a drag reducer outlet;
the slickwater tank 6 is provided with a second drag reducer inlet, a water inlet, a propping agent inlet and a slickwater outlet;
the drag reducer outlet, the first injection pump 2, the first flowmeter 3 and the second drag reducer inlet are communicated in sequence through pipelines;
the first drag reducer inlet, the second flowmeter 5, the electric control valve 4 and the liquid discharge pipeline of the first injection pump 2 are communicated in sequence;
the water tank 8, the second injection pump 9, the third flow meter 10 and the water inlet are communicated in sequence through pipelines;
the proppant tank 11 and the proppant inlet are communicated in sequence through a pipeline;
the on-line viscometer 7 is arranged on the slickwater tank 6, and the on-line viscometer 7 is used for measuring the viscosity of the slickwater prepared in the slickwater tank 6;
the main control unit 12 is electrically connected with the first flowmeter 3, the second flowmeter 5, the third flowmeter 10, the online viscometer 7 and the electric control valve 4, and the main control unit 12 is used for controlling the opening of the electric control valve 4 according to the viscosity of the slickwater so as to enable the viscosity of the slickwater to reach a set threshold value.
The fluid preparation system of the slickwater fracturing fluid provided by the embodiment of the invention can be used for monitoring and controlling the viscosity of the prepared slickwater fracturing fluid in real time. In use, the electrically controlled valve 4 is kept closed, the first injection pump 2 is turned on to pump the drag reducer from the drag reducer tank 1 to the slick water tank 6, and at the same time, the second injection pump 9 is turned on to pump the make-up water from the water tank 8 to the slick water tank 6 and to pump the proppant from the proppant tank 11 into the slick water tank 6. The drag reducer, the prepared water and the propping agent are mixed in the slickwater tank 6 to form slickwater fracturing fluid, the actually measured viscosity value of the slickwater fracturing fluid is measured in real time by using an online viscometer 7, and the actually measured viscosity value is transmitted to the main control unit 12; the main control unit 12 compares the actually measured viscosity value of the slickwater fracturing fluid with the viscosity threshold value of the slickwater fracturing fluid, and controls the opening of the electric control valve 4 according to the comparison result, so that the viscosity of the slickwater reaches the set threshold value.
Therefore, by using the fluid preparation system of the slickwater fracturing fluid provided by the embodiment of the invention, the actually measured viscosity value of the slickwater fracturing fluid is fed back to the main control unit 12 in real time through the online viscometer 7, so that the continuous monitoring of the viscosity value is realized. The main control unit 12 adjusts the opening of the electric control valve 4 in real time, so as to adjust the amount of the drag reducer entering the slickwater tank 6, and thus, the viscosity value of the prepared slickwater fracturing fluid is adjusted in real time.
The viscosity threshold of slickwater fracturing fluid is defined as a, and the measured viscosity value of slickwater fracturing fluid is defined as b.
For example, when a is less than b, the main control unit 12 sends a control command to the electronic control valve 4 according to the difference between a and b, and adjusts the opening degree of the electronic control valve 4, so that a part of the drag reducer pumped by the first injection pump 2 enters the slick water tank 6, and the other part of the drag reducer returns to the drag reducer tank 1 through the electronic control valve 4 until a is equal to b.
When a is larger than b, the main control unit 12 sends a control command to the electronic control valve 4 according to the difference value between a and b, and adjusts the opening of the electronic control valve 4, so that the amount of the slick water fracturing fluid returning to the drag reducer tank 1 is reduced, and the amount of the drag reducer entering the slick water tank 6 is increased until a is equal to b.
When a ═ b, the master control unit 12 does not issue any instruction to any connected components.
When construction pressure fluctuation occurs and a construction pressure value is increased in the fracturing process by using the slickwater fracturing fluid, the main control unit 12 automatically reduces the viscosity threshold value of the slickwater fracturing fluid;
the main control unit 12 sends a control instruction to the electric control valve 4 to reduce the opening of the electric control valve 4, so that the drag reduction amount returned to the drag reduction agent tank 1 through the electric control valve 4 is reduced, the amount of the drag reduction agent entering the slickwater tank 6 is increased, and the viscosity value of the prepared slickwater fracturing fluid is reduced until the viscosity value is equal to the viscosity threshold value of the reconfigured slickwater fracturing fluid.
In addition, due to the adoption of the electric control valve 4, the opening of the electric control valve 4 can be continuously adjusted in an electrodeless way, so that the amount of the drag reducer flowing through the electric control valve 4 can be accurately adjusted, and the prepared slickwater fracturing fluid is accurately controlled to be viscous.
The main control unit 12 is electrically connected to the first flowmeter 3, the second flowmeter 5, the third flowmeter 10, the online viscometer 7, and the electrically controlled valve 4, and the electrical connection may be a wired connection or a wireless connection.
For example, the main control unit 12 is electrically connected to the first flowmeter 3, the second flowmeter 5, the third flowmeter 10, the online viscometer 7, and the electronically controlled valve 4 through cables. The main control unit 12 is constituted by a computer control system.
The main control unit 12 is electrically connected to the first flowmeter 3, the second flowmeter 5, the third flowmeter 10, the on-line viscometer 7, and the electric control valve 4 through a wireless local area network. The main control unit 12 is constituted by a computer control system.
In some possible implementations, proppant in proppant tank 11 is transported into slick tank 6 by a screw conveyor to improve the efficiency of the operation.
In some possible implementations, the drain line of the first injection pump 2 is the line between the first flow meter 3 and the second drag reducer inlet.
So configured, the amount of drag reducer discharged from drag reducer canister 1 can be accurately measured without affecting the return of drag reducer to drag reducer canister 1.
In some possible implementations, the slickwater outlet on the slickwater 6 communicates with the wellhead 14 of the oil and gas well through a pump truck 13.
Due to the arrangement, the fluid preparation system of the slickwater fracturing fluid provided by the embodiment of the invention can be applied to the oil-gas well site, so that the viscosity of the slickwater fracturing fluid entering the oil-gas well is always in an expected range, and the fracturing construction is ensured to be smoothly and efficiently carried out.
In the embodiment of the present invention, before the main control unit 12 is opened, the electrically controlled valve 4 is ensured to be in a closed state. After the main control unit 12 is started, a set viscosity threshold value a of the slickwater fracturing fluid is input into the main control unit 12, and the viscosity threshold value a of the slickwater fracturing fluid is determined after the sand carrying performance of the slickwater and the drag reduction effect of the slickwater in a shaft are comprehensively considered.
In the process that the main control unit 12 adjusts the opening of the electronic control valve 4, the relevant viscosity values, the opening values and the flow values measured by the online viscometer 7, the electronic control valve 4, the first flowmeter 3, the second flowmeter 5 and the third flowmeter 10 are all fed back to the main control unit 12 in real time.
On the other hand, the embodiment of the invention also provides a liquid preparation method of the slickwater fracturing fluid, and the liquid preparation method of the slickwater fracturing fluid adopts any liquid preparation system of the slickwater fracturing fluid.
In some possible implementations, a method of formulating a slickwater fracturing fluid includes:
holding the electronically controlled valve 4 closed, the first injection pump 2 is turned on to pump the drag reducing agent from the drag reducing agent tank 1 to the slick water tank 6, while the second injection pump 9 is turned on to pump the make-up water from the water tank 8 to the slick water tank 6 and to pump the proppant from the proppant tank 11 into the slick water tank 6.
The drag reducer, the prepared water and the propping agent are mixed in the slickwater tank 6 to form slickwater fracturing fluid;
measuring the actual measurement viscosity value of the slickwater fracturing fluid in real time by using an online viscometer 7, and transmitting the actual measurement viscosity value to a main control unit 12;
the main control unit 12 compares the actually measured viscosity value of the slickwater fracturing fluid with the viscosity threshold value of the slickwater fracturing fluid, and controls the opening of the electric control valve 4 according to the comparison result, so that the viscosity of the slickwater reaches the set threshold value.
By using the method for preparing the slickwater fracturing fluid provided by the embodiment of the invention, the actually measured viscosity value of the slickwater fracturing fluid is fed back to the main control unit 12 in real time through the online viscometer 7, so that the continuous monitoring of the viscosity value is realized. The main control unit 12 adjusts the opening of the electric control valve 4 in real time, so as to adjust the amount of the drag reducer entering the slickwater tank 6, and thus, the viscosity value of the prepared slickwater fracturing fluid is adjusted in real time.
(1) In some possible implementation manners, the main control unit 12 compares the measured viscosity value of the slickwater fracturing fluid with the viscosity threshold of the slickwater fracturing fluid, and controls the opening of the electric control valve 4 according to the comparison result, so as to make the viscosity of the slickwater reach the set threshold range, including:
defining the viscosity threshold value of the slickwater fracturing fluid as a, and defining the actually measured viscosity value of the slickwater fracturing fluid as b;
when a is less than b, the main control unit 12 sends a control command to the electronic control valve 4 according to the difference value between a and b, and adjusts the opening degree of the electronic control valve 4, so that one part of the drag reducer pumped by the first injection pump 2 enters the slick water tank 6, and the other part of the drag reducer returns to the drag reducer tank 1 through the electronic control valve 4 until a is b.
That is, the main control unit 12 sends a control command to the electrically controlled valve 4 according to the difference between a and b, and the electrically controlled valve 4 is opened to a certain ratio. At this time, one part of the drag reducer pumped out by the first injection pump 2 continues to enter the slickwater tank 6, and the other part of the drag reducer flows back to the drag reducer tank 1 through the electric control valve 4, so that the drag reducer amount entering the slickwater tank 6 is reduced, and the viscosity value b of the prepared slickwater fracturing fluid is reduced and approaches to be equal to the set viscosity threshold value a of the slickwater fracturing fluid.
(2) In some possible implementation manners, the main control unit 12 compares the measured viscosity value of the slickwater fracturing fluid with the viscosity threshold of the slickwater fracturing fluid, and controls the opening of the electric control valve 4 according to the comparison result, so as to make the viscosity of the slickwater reach the set threshold range, including:
defining the viscosity threshold value of the slickwater fracturing fluid as a, and defining the actually measured viscosity value of the slickwater fracturing fluid as b;
when a is larger than b, the main control unit 12 sends a control command to the electronic control valve 4 according to the difference value between a and b, and adjusts the opening of the electronic control valve 4 to reduce the amount of the slick water fracturing fluid returning to the drag reducer tank 1, and then increase the amount of the drag reducer entering the slick water tank 6 until a is equal to b.
That is, the main control unit 12 sends a control instruction to the electrically controlled valve 4 according to the difference between a and b, and the opening of the electrically controlled valve 4 is reduced to a certain ratio. At this time, the drag reducing agent amount flowing back to the drag reducing agent tank 1 through the electric control valve 4 is reduced, the amount of the drag reducing agent pumped out through the first injection pump 2 into the slickwater tank 6 is increased, the viscosity value b of the prepared slickwater fracturing fluid is increased and approaches to be equal to the set viscosity threshold value a of the slickwater fracturing fluid.
Note that when a ═ b, the master control unit 12 does not issue any instruction to any connected component.
In some possible implementation manners, when construction pressure fluctuation occurs and a construction pressure value is increased in the fracturing process by using the slickwater fracturing fluid, the main control unit 12 automatically reduces the viscosity threshold value of the slickwater fracturing fluid;
the main control unit 12 sends a control instruction to the electric control valve 4 to reduce the opening of the electric control valve 4, so that the drag reduction amount returned to the drag reduction agent tank 1 through the electric control valve 4 is reduced, the amount of the drag reduction agent entering the slickwater tank 6 is increased, and the viscosity value of the prepared slickwater fracturing fluid is reduced until the viscosity value is equal to the viscosity threshold value of the reconfigured slickwater fracturing fluid.
So set up for when the in-process that utilizes slickwater fracturing fluid to carry out fracturing takes place construction pressure fluctuation and the condition that the construction pressure value increases in the face, also can guarantee that the viscosity of slickwater fracturing fluid in the oil gas well reduces and remains at stable level all the time.
In some possible implementations, the flow rate of the drag reducer pumped by the first injection pump 2 is measured in real time by the first flow meter 3 and transmitted to the master control unit 12 when the slickwater fracturing fluid is being formulated;
the main control unit 12 determines the amount of drag reducing agent to be discharged from the drag reducing agent canister 1 based on the flow rate of drag reducing agent.
So set up, can the accurate calculation go into the use amount of drag reducer of pump to the oil gas well, be convenient for to the real time monitoring of fracturing operation.
In some possible implementations, the flow rate of the drag reducer returned to the drag reducer tank 1 by the electrically controlled valve 4 is measured in real time by the second flow meter 5 and transmitted to the master control unit 12 when formulating the slickwater fracturing fluid;
the main control unit 12 determines the amount of drag reducing agent that is returned to the drag reducing agent tank 1 based on the flow rate of drag reducing agent.
In some possible implementations, when preparing the slickwater fracturing fluid, the third flow meter 10 is used for measuring the flow rate of the water pumped out by the second injection pump 9 in real time and transmitting the measured flow rate to the main control unit 12;
the main control unit 12 determines the amount of water to be discharged from the water tank 8 according to the flow rate of the water.
So set up, the use amount of water when can the accurate calculation prepare slickwater fracturing fluid, be convenient for to the real time monitoring of fracturing operation.
In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fluid preparation system of slickwater fracturing fluid is characterized by comprising the following components: the drag reducer comprises a drag reducer tank, a first injection pump, a first flow meter, an electric control valve, a second flow meter, a slip water tank, an online viscometer, a water tank, a second injection pump, a third flow meter, a proppant tank and a main control unit;
the drag reducer canister has a first drag reducer inlet and a drag reducer outlet thereon;
the slickwater tank is provided with a second drag reducer inlet, a water inlet, a propping agent inlet and a slickwater outlet;
the drag reducer outlet, the first injection pump, the first flow meter, and the second drag reducer inlet are in serial communication via a pipeline;
the first drag reducer inlet, the second flowmeter, the electric control valve and a liquid discharge pipeline of the first injection pump are communicated in sequence;
the water tank, the second injection pump, the third flow meter and the water inlet are communicated in sequence through pipelines;
the proppant tank and the proppant inlet are communicated in sequence through a pipeline;
the on-line viscometer is arranged on the slickwater tank and is used for measuring the viscosity of the slickwater prepared in the slickwater tank;
the main control unit is electrically connected with the first flowmeter, the second flowmeter, the third flowmeter, the online viscometer and the electric control valve, and the main control unit is used for controlling the opening degree of the electric control valve according to the viscosity of the slickwater so as to enable the viscosity of the slickwater to reach a set threshold value.
2. The slickwater fracturing fluid dispensing system of claim 1, wherein the drain line of the first injection pump is a line between the first flow meter and the second drag reducer inlet.
3. The slickwater fracturing fluid distribution system of claim 1, wherein the slickwater outlet on the slickwater is communicated with a wellhead of an oil and gas well through a pump truck set.
4. A method for preparing a slickwater fracturing fluid, which is characterized by adopting the system for preparing the slickwater fracturing fluid of any one of claims 1 to 3.
5. The method of formulating a slickwater fracturing fluid of claim 4, comprising:
keeping the electric control valve in a closed state, starting a first injection pump to pump the drag reducer in the drag reducer tank to the slick water tank, and simultaneously starting a second injection pump to pump the prepared water in the water tank to the slick water tank and make the proppant in the proppant tank enter the slick water tank;
the drag reducer, the prepared water and the propping agent are mixed in the slickwater tank to form slickwater fracturing fluid;
measuring the actually measured viscosity value of the slickwater fracturing fluid in real time by using an online viscometer, and transmitting the actually measured viscosity value to a main control unit;
and the main control unit compares the actually measured viscosity value of the slickwater fracturing fluid with the viscosity threshold value of the slickwater fracturing fluid, and controls the opening of the electric control valve according to the comparison result so as to enable the viscosity of the slickwater to reach the set threshold value.
6. The method for preparing slickwater fracturing fluid according to claim 5, wherein the main control unit compares the measured viscosity value of the slickwater fracturing fluid with a viscosity threshold value of the slickwater fracturing fluid, and controls the opening of an electric control valve according to the comparison result so as to enable the viscosity of the slickwater to reach a set threshold value range, and the method comprises the following steps:
defining the viscosity threshold value of the slickwater fracturing fluid as a and the actually measured viscosity value of the slickwater fracturing fluid as b;
and when a is larger than b, the main control unit sends a control command to the electric control valve according to the difference value between a and b, and the opening of the electric control valve is adjusted, so that one part of the drag reducer pumped by the first injection pump enters the slick water tank, and the other part of the drag reducer returns to the drag reducer tank through the electric control valve until a is larger than b.
7. The method for preparing slickwater fracturing fluid according to claim 6, wherein the main control unit compares the measured viscosity value of the slickwater fracturing fluid with a viscosity threshold value of the slickwater fracturing fluid, and controls the opening of the electric control valve according to the comparison result so as to enable the viscosity of the slickwater to reach a set threshold value range, and the method comprises the following steps:
defining the viscosity threshold value of the slickwater fracturing fluid as a and the actually measured viscosity value of the slickwater fracturing fluid as b;
and when a is larger than b, the main control unit sends a control instruction to the electric control valve according to the difference value between a and b, and the opening of the electric control valve is adjusted, so that the amount of the slickwater fracturing fluid returning to the drag reducer tank is reduced, and the amount of the drag reducer entering the slickwater tank is increased until a is equal to b.
8. The method for preparing slickwater fracturing fluid according to claim 5, wherein when construction pressure fluctuation occurs and a construction pressure value is increased in the fracturing process by using the slickwater fracturing fluid, the main control unit automatically adjusts the viscosity threshold value of the slickwater fracturing fluid to be small;
and the main control unit sends a control instruction to the electric control valve to reduce the opening of the electric control valve, so that the drag reduction amount returned to the drag reduction agent tank through the electric control valve is reduced, the amount of the drag reduction agent entering the slickwater tank is increased, and the viscosity value of the prepared slickwater fracturing fluid is reduced until the viscosity value is equal to the viscosity threshold value of the reconfigured slickwater fracturing fluid.
9. The method of formulating a slickwater fracturing fluid as claimed in any one of claims 5-8, wherein the flow rate of the drag reducer pumped by the first injection pump is measured in real time by a first flow meter and transmitted to the master control unit when formulating the slickwater fracturing fluid;
the master control unit determines an amount of drag reducer to discharge from the drag reducer canister based on the flow rate of drag reducer.
10. The method for preparing slickwater fracturing fluid according to any one of claims 5-8, wherein when the slickwater fracturing fluid is prepared, the flow rate of water pumped by the second injection pump is measured in real time by using a third flow meter and is transmitted to a main control unit;
and the main control unit determines the amount of water discharged by the water tank according to the flow rate of the water.
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