A large-displacement multifunctional acid solution preparation and supply integrated system and dosage calculation method

Abstract

The present invention discloses a large-displacement multifunctional acid solution preparation and supply integrated system and a dosage calculation method, which relates to the field of acid solution mixing technology, including a powder tank, a front tank, and a rear tank. The powder tank is connected to the front tank and the rear tank through a jet injection module; the front tank and the rear tank are connected through a two-way circulation pipeline; the rear tank is provided with a single circulation pipeline, the bottom of the rear tank is connected to the discharge pipeline, and the top of the rear tank is connected to the clean water pipeline. The present invention can not only realize batch mixing of acid solution, and in the case of discontinuous supply of industrial raw acid, a batch of acid solution can be prepared and then continued to be prepared after the subsequent acid solution is transported to the place, but also realize online acid preparation, and the industrial raw acid can be prepared in advance to achieve simultaneous preparation and use, and can also be prepared and stored according to production; it can prepare both high-viscosity gelling acid and conventional low-viscosity deblocking acid, with a maximum acid uptake / absorption rate of 6m³ / min and a maximum discharge rate of finished acid of 10m³ / min.

Description

Technical Field

[0001] The invention relates to the technical field of acid liquid mixing, in particular to a large-displacement multifunctional acid liquid dispensing and supplying integrated system and a dispensing calculation method. Background Art

[0002] At present, the main domestic preparation of high-viscosity acid liquid is usually divided into three steps: unloading acid, circulation, and adding additives. Because additives such as gelling agents and corrosion inhibitors dissolve slowly and lack stirring in the middle, it takes a long time to place and increase viscosity. It is usually necessary to complete the preparation one day before use.

[0003] Announcement No.: CN117619240A, discloses an online preparation device and preparation method for high-viscosity acid liquid, which can realize online dry and wet preparation of high-viscosity acid liquid, but does not have the function of online detection and real-time circulation adjustment of acid liquid performance, and cannot ensure that the performance of the discharged finished acid liquid meets the design requirements.

[0004] Announcement No.: CN213434202U, discloses a continuous automatic mixing device for oilfield acidizing fluid, which is equipped with an automatic control valve, a flow meter and a centrifugal pump to achieve full automatic operation and remote monitoring, and realizes effective metering and sufficient mixing through automatic control. However, the two tanks of the device are independent of each other and cannot be used in conjunction with each other, and cannot be circulated and mixed.

[0005] Announcement No. CN217410434U discloses a rapid dissolution device for thickening agent for acidification, which can accelerate the dissolution rate and improve work efficiency, but the device cannot perform cyclic mixing and cannot ensure that the performance of the discharged finished acid liquid meets the design requirements.

[0006] In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the beneficial effects produced are all different from the present invention. Regarding more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the invention

[0007] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a large-displacement and multifunctional acid liquid preparation and supply integrated system and a preparation calculation method.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] On the one hand, the present invention provides a large-displacement multifunctional acid liquid preparation and supply integrated system, including a powder tank, a front tank, and a rear tank. The powder tank is connected to the front tank and the rear tank through a jet injection module; the front tank and the rear tank are connected through a two-way circulation pipeline; the rear tank is provided with a single circulation pipeline, the bottom of the rear tank is connected to the discharge pipeline, and the top of the rear tank is connected to the clean water pipeline.

[0010] Furthermore, the powder tank comprises a first tank cavity and a second tank cavity, the bottom of the first tank cavity is communicated with a first screw conveyor, and the bottom of the second tank cavity is communicated with a second screw conveyor;

[0011] Specifically, the jet injection module includes a first jet injection pipeline and a third injector;

[0012] Specifically, the first jet injection pipeline includes a first pipeline row, a first liquid pump, a first flow meter, and a first ejector which are connected in sequence, and a first pressure gauge is also provided between the first liquid pump and the first ejector;

[0013] Specifically, the first ejector outlet is communicated with the top of the front tank, and the material inlet of the first ejector is communicated with the first screw conveyor outlet.

[0014] Furthermore, the bidirectional circulation pipeline includes a top pipeline, a bottom pipeline, and an interconnecting pipeline;

[0015] Specifically, the top pipeline is connected with the top of the front tank and the top of the rear tank, and the first control valve, the second control valve, the third flow meter, and the third injector are sequentially arranged on the top pipeline. The first control valve is close to the front tank, and the material inlet of the third injector is connected with the second screw conveyor;

[0016] Specifically, the bottom pipeline is connected to the bottom of the front tank and the bottom of the rear tank, and a third control valve and a fourth control valve are sequentially arranged on the bottom pipeline, and the third control valve is close to the front tank;

[0017] Specifically, the interconnecting pipeline is connected with the top pipeline and the bottom pipeline. The connection between the interconnecting pipeline and the top pipeline is between the first control valve and the second control valve. The connection between the interconnecting pipeline and the bottom pipeline is between the third control valve and the fourth control valve. A third liquid pump is arranged on the interconnecting pipeline.

[0018] Furthermore, the single-circulation pipeline is connected to the top and bottom of the rear tank, an eighth control valve is provided at one end of the single-circulation pipeline close to the bottom of the rear tank, and a density meter, a viscometer, a concentration meter, and a ninth liquid pump are provided between the eighth control valve and the top of the rear tank.

[0019] Furthermore, the discharge pipeline is communicated with the bottom of the rear tank, a ninth control valve, a fifth liquid pump, and a fifth flow meter are sequentially arranged on the discharge pipeline, and the discharge pipeline outlet is communicated with the fifth pipeline row.

[0020] Furthermore, one end of the clean water pipeline away from the rear tank is connected to a third pipeline row, and a fourth liquid pump and a fourth flow meter are sequentially arranged on the clean water pipeline;

[0021] Specifically, the fourth liquid pump is close to the third pipeline row, and the clean water pipeline is connected with a third pressure gauge between the fourth liquid pump and the fourth flow meter.

[0022] Furthermore, a liquid pump group and a first defoamer are arranged on the top of the front tank, and a first liquid level gauge and a first agitator are arranged inside the front tank;

[0023] Specifically, a second defoamer is arranged on the top of the rear tank, and a second liquid level gauge and a second agitator are arranged inside the rear tank;

[0024] Specifically, the top of the front tank and the top of the rear tank are connected to the acid mist neutralization tank.

[0025] Further, the bottom pipeline is connected to a first drain pipeline between the bottom of the front tank and the third control valve, and a first drain valve is provided on the first drain pipeline;

[0026] Specifically, the discharge pipeline is connected with the sampling pipeline and the second emptying pipeline between the bottom of the rear tank and the ninth control valve, the sampling pipeline is provided with a sampling valve, and the second emptying pipeline is provided with a second emptying valve;

[0027] Specifically, the single circulation pipeline is communicated with the discharge pipeline, and the connection between the single circulation pipeline and the discharge pipeline is between the bottom of the rear tank and the ninth control valve.

[0028] Furthermore, the bottom pipeline of the bidirectional circulation pipeline is connected with the first liquid medicine pipeline and the second liquid medicine pipeline between the third control valve and the fourth control valve;

[0029] Specifically, a fifth control valve and a sixth liquid pump are sequentially arranged on the first liquid medicine pipeline, and the fifth control valve is close to the bottom pipeline;

[0030] Specifically, a sixth control valve and a seventh liquid pump are sequentially arranged on the second liquid medicine pipeline, and the sixth control valve is close to the bottom pipeline;

[0031] Specifically, the discharge pipeline is connected to the mixing pipeline between the ninth control valve and the fifth liquid pump, one end of the mixing pipeline away from the discharge pipeline is connected to the fourth pipeline row, and the mixing pipeline is provided with an eleventh control valve;

[0032] Specifically, the discharge pipeline is connected with an auxiliary discharge pipeline between the fourth pressure gauge and the fifth pipeline row, and an eighth liquid pump and a tenth control valve are sequentially arranged on the auxiliary discharge pipeline, and the eighth liquid pump is far away from the discharge pipeline.

[0033] In another aspect, the present invention provides a method for calculating the amount of high-volume, high-viscosity acid to be prepared, comprising the following steps:

[0034] Hydrochloric acid dosage V0 and clean water dosage V w calculate:

[0035] (Formula 1);

[0036] V w =V-V0 (Formula 2);

[0037] In formula (1) and (2):

[0038] V0 is the amount of industrial raw acid, m 3 ;

[0039] V w The amount of clean water required for acid preparation, m 3 ;

[0040] ρ0 is the density of industrial raw acid, g / cm 3 ;

[0041] W0 is the mass fraction of industrial raw acid, %;

[0042] V is the volume of hydrochloric acid solution to be prepared, m 3 ;

[0043] ρ Density of the acid solution to be prepared, g / cm 3 ;

[0044] W is the mass fraction of the acid solution to be prepared, %;

[0045] There is a corresponding relationship table between hydrochloric acid concentration and density. Take 2 decimal places and check the table to find out;

[0046] Calculation of the amount of each additive for preparing gelled acid:

[0047] The amount of hydrochloric acid V0 is calculated according to formula (1). Other additives are added according to the formula in mass fraction. After the powdered additives are dissolved, they only increase the viscosity and do not increase the volume of the solution. The amount of liquid additives is calculated according to formula (3) and needs to be deducted from the clean water. The amount of clean water is calculated according to formula (4).

[0048] m i =ρ*V*W i *1000 (Formula 3);

[0049] (Formula 4);

[0050] In formula (3) and (4):

[0051] m i is the mass of additive, i=1,2,3..., unit: kg;

[0052] ρ Density of the acid solution to be prepared, g / cm 3 ;

[0053] W iis the mass fraction of additive, %, i=1,2,3...;

[0054] V w ， The amount of clean water to consider the volume of additives, m 3 ;

[0055] ρ i is the mass of additive, g / cm 3 ;

[0056] The calculated results are used in the system described in one aspect to prepare acid.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] 1. The present invention designs two acid tanks on the preparation system skid, and adds the insoluble additives and thickening additives into the front and rear tanks respectively. The front tank dilutes the concentration by heat release + stirring + defoaming to enhance the dissolution of the corrosion inhibitor and synergist, and the thickener is added into the rear tank to reduce the effect of viscosity on the dissolution of the additive.

[0059] 2. The rear tank of the present invention is designed with a viscosity, density, and liquid level metering monitoring system, and can detect key performance indicators of the acid in the rear tank through the ninth liquid pump to circulate between the rear tanks to ensure the quality of the discharged acid. If the viscosity, density or acid volume of the acid tank does not meet the design requirements, the viscosity can be ensured to meet the index requirements by circulating the front and rear acid tanks or adding clean water / additives.

[0060] 3. The present invention can realize batch mixing of acid solution, prepare a batch of acid solution in case of discontinuous supply of industrial raw acid, and then continue to prepare after the subsequent acid solution is transported to the site. It can also realize online acid preparation, and industrial raw acid can be prepared in advance to achieve simultaneous preparation and use, or it can be prepared and stored according to production. It can prepare both high-viscosity gelling acid and conventional low-viscosity plugging-removing acid, with a maximum acid uptake / absorption rate of 6m³ / min and a maximum finished acid discharge rate of 10m³ / min.

[0061] 4. The present invention has a displacement and acid concentration testing device for high-concentration industrial raw acid, and calculates and controls the precise addition of various additives based on the test results, thereby reducing the impact of the difference in concentration of various industrial raw acids on the concentration of finished acid.

[0062] 5. It can prepare acid solution (such as gelled acid and steering acid of different viscosities), fracturing fluid and slippery water; it can add powdered gelling agent online, and it can also add emulsion gelling agent online.

[0063] 6. It integrates large-volume dispensing and supply functions to meet the needs of various working conditions; the acid can be dispensed and supplied at the same time, such as large-volume dispensing and use of plugging-removing acid without gelling agent, integrated variable-viscosity acid, and liquid variable-viscosity acid thickener directly mixed with acid in the rear tank through a liquid adding pump and then directly discharged for use. The liquid type can be switched online intelligently, and the automatic and rapid switching between acid and fracturing fluid, slippery water, clean water, and different acids (such as gelled acid and steering acid, autogenous acid) can be achieved through the control system to meet the needs of multi-stage alternating acid fracturing process implementation; the maximum discharge rate of finished acid is 10m³ / min. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is the principle diagram of the equipment manifold of the present invention;

[0065] Figure 2 It is a structural schematic diagram of a large-displacement multifunctional acid solution preparation and supply integrated system of the present invention.

[0066] In the figure: 1. powder tank; 1.1. first screw conveyor; 1.2. second screw conveyor; 2. front tank; 2.1. first agitator; 2.2. first defoamer; 3. rear tank; 3.1. second agitator; 3.2. second defoamer; 4. acid mist neutralization tank;

[0067] G1, first pipeline row; G2, second pipeline row; G3, third pipeline row; G4, fourth pipeline row; G5, fifth pipeline row;

[0068] B0, liquid pump group; B1, first liquid pump; B2, second liquid pump; B3, third liquid pump; B4, fourth liquid pump; B5, fifth liquid pump; B6, sixth liquid pump; B7, seventh liquid pump; B8, eighth liquid pump; B9, ninth liquid pump;

[0069] PT1, first pressure gauge; PT2, second pressure gauge; PT3, third pressure gauge; PT4, fourth pressure gauge;

[0070] FM1, first flow meter; FM2, second flow meter; FM3, third flow meter; FM4, fourth flow meter; FM5, fifth flow meter;

[0071] P1, first injector; P2, second injector; P3, third injector;

[0072] LG1, the first liquid level gauge; LG2, the second liquid level gauge;

[0073] CM, density meter; VM, viscometer; ND, concentration meter;

[0074] F1, first control valve; F2, second control valve; F3, third control valve; F4, fourth control valve; F5, fifth control valve; F6, sixth control valve; F8, eighth control valve; F9, ninth control valve; F10, tenth control valve;

[0075] PF1, first drain valve; PF2, second drain valve; QF, sampling valve;

[0076] Y1, the first reserved port; Y2, the second reserved port; Y3, the third reserved port; Y4, the fourth reserved port; Y5, the fifth reserved port; Y6, the sixth reserved port; Y7, the seventh reserved port. DETAILED DESCRIPTION

[0077] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] Embodiment 1:

[0079] See also Figure 1 The present invention provides a large-displacement multifunctional acid liquid preparation and supply integrated system, including an acid preparation skid, the acid preparation skid includes a powder tank 1, a front tank 2, and a rear tank 3, the powder tank 1 is connected with the front tank 2 and the rear tank 3 through a jet injection module, the front tank 2 and the rear tank 3 are connected through a two-way circulation pipeline, the rear tank 3 is provided with a single circulation pipeline, the rear tank 3 is provided with a discharge pipeline, and the top of the rear tank is connected with a clean water pipeline.

[0080] Furthermore, the powder tank 1 comprises a first tank cavity and a second tank cavity, the bottom of the first tank cavity is communicated with a first screw conveyor 1.1, and the bottom of the second tank cavity is communicated with a second screw conveyor 1.2.

[0081] Furthermore, the jet injection module includes a first jet injection pipeline, a second jet injection pipeline, and a third injector P3, the first jet injection pipeline includes a first pipeline row G1, a first liquid pump B1, a first flowmeter FM1, and a first injector P1 connected in sequence, a first pressure gauge PT1 is also arranged between the first liquid pump B1 and the first injector P1, the outlet of the first injector P1 is connected to the top of the front tank 2, and the material inlet of the first injector P1 is connected to the outlet of the first screw conveyor 1.1; the second jet injection pipeline includes a second pipeline row G2, a second liquid pump B2, a second flowmeter FM2, and a second injector P2 connected in sequence, a second pressure gauge PT2 is also arranged between the second liquid pump B2 and the second injector P2, the outlet of the second injector P2 is connected to the top of the front tank 2, and the material inlet of the second injector P2 is connected to the outlet of the first screw conveyor 1.1.

[0082] Among them, the first pipeline row G1 is a three-port pipeline row, and the second pipeline row G2 is a five-port pipeline row. Through the tee, the interface can be further increased. The front tank 2 can be connected to more than eight acid trucks to supply acid at the same time to meet the needs of large-displacement acid distribution. The maximum acid absorption speed is 6m 3 / min.

[0083] Furthermore, a liquid pump group B0 and a first defoamer 2.2 are provided on the top of the front tank 2, and a first liquid level gauge LG1 and a first agitator 2.1 are provided in the front tank 2; a second defoamer 3.2 is provided on the top of the rear tank 3, and a second liquid level gauge LG2 and a second agitator 3.1 are provided in the rear tank 3; the top of the front tank 2 and the top of the rear tank 3 are connected to the acid mist neutralization tank 4.

[0084] Among them, the liquid pump group B0 is used to inject clean water for preliminary mixing; the defoamer is used to remove foam; the liquid level meter is used to detect the liquid height in the tank; the agitator is used to speed up the mixing speed and make the mixing sufficient; the acid mist neutralization tank 4 is used to absorb the acid mist to avoid polluting the environment.

[0085] Furthermore, the bidirectional circulation pipeline includes a top pipeline, a bottom pipeline, and an interconnecting pipeline; the top pipeline is connected to the top of the front tank 2 and the top of the rear tank 3, and the top pipeline is provided with a first control valve F1, a second control valve F2, a third flowmeter FM3, and a third injector P3 in sequence, the first control valve F1 is close to the front tank 2, and the material inlet of the third injector P3 is connected to the second screw conveyor 1.2; the bottom pipeline is connected to the bottom of the front tank 2 and the bottom of the rear tank 3, and the bottom pipeline is provided with a third control valve F3 and a fourth control valve F4 in sequence, and the third control valve F3 is close to the front tank 2; the interconnecting pipeline is connected to the top pipeline and the bottom pipeline, and the connection between the interconnecting pipeline and the top pipeline is between the first control valve F1 and the second control valve F2, and the connection between the interconnecting pipeline and the bottom pipeline is between the third control valve F3 and the fourth control valve F4, and the interconnecting pipeline is provided with a third liquid pump B3.

[0086] The bottom pipeline is connected to the first drain pipeline between the bottom of the front tank 2 and the third control valve F3 , and the first drain pipeline is provided with a first drain valve PF1 .

[0087] Among them, driven by the third liquid pump B3, the control of the first control valve F1, the second control valve F2, the third control valve F3, and the fourth control valve F4 can realize a single circulation of the liquid in the front tank 2, a single circulation of the liquid in the rear tank 3, the input of the liquid from the front tank 2 to the rear tank 3, and the input of the liquid from the rear tank 3 to the front tank 2, to meet various mixing requirements.

[0088] Specifically, the injector includes a liquid inlet, a material inlet, and an outlet. After the liquid enters the injector, it is mixed with the material and ejected from the outlet under the restriction of the injector housing and fully mixed. The injector itself is prior art, and its detailed structure and usage are clear to those skilled in the art.

[0089] Furthermore, the single-circulation pipeline is connected to the top and bottom of the rear tank 3, and an eighth control valve F8 is provided at one end of the single-circulation pipeline close to the bottom of the rear tank 3. A density meter CM, a viscometer VM, a concentration meter ND, and a ninth liquid pump B9 are provided between the eighth control valve F8 and the top of the rear tank 3 in the single-circulation pipeline.

[0090] Among them, the eighth control valve F8 opens and closes the empty single circulation liquid circuit; the ninth liquid pump B9 circulates and mixes the liquid in the rear tank 3 from bottom to top; the density meter CM, viscometer VM, and concentration meter ND detect the state of the liquid in the rear tank 3 to ensure that the liquid meets the standards.

[0091] Furthermore, the discharge pipeline is connected to the bottom of the rear tank 3, and a ninth control valve F9, a fifth liquid pump B5, and a fifth flow meter FM5 are sequentially arranged on the discharge pipeline. The discharge pipeline outlet is connected to the fifth pipeline row G5. The discharge pipeline is connected to the sampling pipeline and the second emptying pipeline between the bottom of the rear tank 3 and the ninth control valve F9. A sampling valve QF is arranged on the sampling pipeline, and a second emptying valve PF2 is arranged on the second emptying pipeline.

[0092] Among them, the sampling valve QF is used for sampling the mixed solution; the first drain valve PF1 and the second drain valve PF2 are used for draining the liquid in the front tank 2 and the rear tank 3; the fifth pipeline G5 is used for connecting with the fracturing truck.

[0093] Furthermore, the single circulation pipeline is connected to the discharge pipeline, and the connection between the single circulation pipeline and the discharge pipeline is between the bottom of the rear tank 3 and the ninth control valve F9, so that the second drain valve PF2 can directly discharge the liquid in the single circulation pipeline.

[0094] Furthermore, one end of the clean water pipeline away from the rear tank 3 is connected to the third pipeline row G3, and a fourth liquid pump B4 and a fourth flow meter FM4 are sequentially arranged on the clean water pipeline, the fourth liquid pump B4 is close to the third pipeline row G3, and a third pressure gauge PT3 is connected between the fourth liquid pump B4 and the fourth flow meter FM4. The clean water pipeline pumps clean water into the rear tank 3 to complete the mixing work.

[0095] Embodiment 2:

[0096] Based on Example 1, this example further improves the performance of the system.

[0097] The bottom pipeline of the bidirectional circulation pipeline is connected with the first liquid medicine pipeline and the second liquid medicine pipeline between the third control valve F3 and the fourth control valve F4. The first liquid medicine pipeline is provided with a fifth control valve F5 and a sixth liquid pump B6 in sequence, and the fifth control valve F5 is close to the bottom pipeline. The second liquid medicine pipeline is provided with a sixth control valve F6 and a seventh liquid pump B7 in sequence, and the sixth control valve F6 is close to the bottom pipeline.

[0098] The first liquid medicine pipeline and the second liquid medicine pipeline are used to add liquid medicine into the front tank 2 or the rear tank 3 .

[0099] The discharge pipeline is connected to the mixing pipeline between the ninth control valve F9 and the fifth liquid pump B5. One end of the mixing pipeline away from the discharge pipeline is connected to the fourth pipeline row G4. The mixing pipeline is provided with an eleventh control valve F11.

[0100] Among them, the mixed injection pipeline is used to connect other fluid supply equipment, such as fracturing fluid glue, slippery water, etc., which are pumped out through the fifth liquid pump B5 and controlled by the eleventh control valve F11 to meet the requirements of fast switching between fracturing fluid and acid and large displacement output.

[0101] The discharge pipeline is connected with an auxiliary discharge pipeline between the fourth pressure gauge PT4 and the fifth pipeline G5. The auxiliary discharge pipeline is sequentially provided with an eighth liquid pump B8 and a tenth control valve F10. The eighth liquid pump B8 is far away from the discharge pipeline.

[0102] Among them, the drainage pipeline is used to inject drainage aids into the discharge pipeline to prevent blockage.

[0103] In order to improve the redundancy of the system, the first pipeline row G1 is provided with a first reserved port Y1; the second pipeline row G2 is provided with a second reserved port Y2; the third pipeline row G3 is provided with a third reserved port Y3; the fourth pipeline row G4 is provided with a fourth reserved port Y4; the auxiliary drainage pipeline is provided with a fifth reserved port Y5 between the tenth control valve F10 and the discharge pipeline for connecting external auxiliary drainage equipment; the top of the rear tank 3 is provided with a sixth reserved port for external equipment to add clean water; the discharge pipeline is provided with a seventh reserved port between the ninth control valve F9 and the fifth liquid pump B5 for connecting external liquid distribution equipment.

[0104] Embodiment 3:

[0105] Based on Example 2, a large-displacement multifunctional acid liquid preparation and supply integrated system also includes a power skid and a control system. The power skid and the control system are externalized to improve the passability of the acid preparation skid loader in mountainous and hilly areas.

[0106] The control system includes an automatic controller, which is a PLC programmable controller; the power skid supplies power to the control system and the acid distribution skid.

[0107] The control valves are all electromagnetic manual integrated valves with two modes, electric and manual. The control valves are all electrically connected to an automatic controller.

[0108] The liquid pumps are all electrically controlled pumps, and all the liquid pumps are electrically connected to the automatic controller.

[0109] All agitators and screw conveyors are driven by variable frequency motors, and all variable frequency motors are electrically connected to automatic controllers. Using variable frequency motors makes it easier to control the speed.

[0110] All pressure meters, flow meters, level meters, density meters CM, viscometers VM, and concentration meters ND are electrically connected to the automatic controller.

[0111] When the automatic controller is preparing liquid, the powder mixing ratio, liquid additive addition ratio and liquid preparation flow rate can be changed online in real time to meet the requirements of non-stop switching and continuous construction of different acid liquid formulas; the automatic controller receives various data of the acid liquid and automatically adjusts the speed of adding additives accordingly; through online detection of the original acid performance, precise metering and addition of various additives, and online detection of acid liquid density and viscosity performance indicators during the preparation process, the rapid preparation, performance regulation and discharge of the acid liquid are integrated, which better meets the needs of deep well large-scale acid fracturing construction.

[0112] Embodiment 4:

[0113] Based on Example 3, this example provides a method for using a large-displacement multifunctional acid solution preparation and supply integrated system, comprising the following steps:

[0114] A0, hydrochloric acid, water usage / discharge calculation and gelled acid preparation additives calculation:

[0115] Hydrochloric acid dosage V0 and clean water dosage V w calculate:

[0116] (Formula 1);

[0117] V w =V-V0 (Formula 2);

[0118] In formula (1) and (2):

[0119] V0 is the amount of industrial raw acid, m 3 ;

[0120] V w The amount of clean water required for acid preparation, m 3 ;

[0121] ρ0 is the density of industrial raw acid, g / cm 3 ;

[0122] W0 is the mass fraction of industrial raw acid, %;

[0123] V is the volume of hydrochloric acid solution to be prepared, m 3 ;

[0124] ρ Density of the acid solution to be prepared, g / cm 3 ;

[0125] W is the mass fraction of the acid solution to be prepared, %;

[0126] There is a corresponding relationship table between hydrochloric acid concentration and density. Take 2 decimal places and check the table to find out;

[0127] Calculation of the amount of each additive for preparing gelled acid:

[0128] The amount of hydrochloric acid V0 is calculated according to formula (1). Other additives are added according to the formula in mass fraction. After the powdered additives are dissolved, they only increase the viscosity and do not increase the volume of the solution. The amount of liquid additives is calculated according to formula (3) and needs to be deducted from the clean water. The amount of clean water is calculated according to formula (4).

[0129] m i =ρ*V*W i *1000 (Formula 3);

[0130] (Formula 4);

[0131] In formula (3) and (4):

[0132] m i is the mass of additive, i=1,2,3..., unit: kg;

[0133] ρ Density of the acid solution to be prepared, g / cm 3 ;

[0134] W i is the mass fraction of additive, %, i=1,2,3...;

[0135] V w ， The amount of clean water to consider the volume of additives, m 3 ;

[0136] ρ i is the mass of additive, g / cm 3 ;

[0137] A1, the first liquid pump B1 and the second liquid pump B2 suck / pump the high-concentration industrial acid into the front tank 2, and the powder tank 1 adds the insoluble dry powder corrosion inhibitor, corrosion inhibitor, iron stabilizer, etc. in the first tank cavity into the front tank 2 through the first screw conveyor 1.1. The powder is preliminarily mixed in the first ejector P1 and the second ejector P2, and is fully stirred and mixed in the front tank 2. A two-way circulation pipeline is used to perform a single circulation in the front tank 2 to increase the speed of mixed dissolution;

[0138] A2, the two-way circulation pipeline pumps the liquid in the front tank 2 into the rear tank 3, the clean water pipeline works to pump clean water in for dilution, the circulation pipeline works, the density meter CM, viscometer VM, and concentration meter ND detect the liquid state;

[0139] In the process of the bidirectional circulation pipeline pumping the liquid in the front tank 2 into the rear tank 3, the gelling agent in the second tank cavity is sent to the rear tank 3 through the second screw conveyor 1.2, and the gelling agent solution is sent to the rear tank 3 through the first liquid medicine pipeline and the second liquid medicine pipeline;

[0140] A3. After the test is qualified, samples are taken through the sampling pipeline and discharged to the manifold through the discharge pipeline. During the discharge, the auxiliary discharge pipeline adds drainage aids to the discharge pipeline.

[0141] Embodiment 5:

[0142] In this example, the acid solution prepared in a certain well has an original acid concentration of 36%. To prepare an acid solution with a concentration of 20%, 500 m 3 , then the volume of industrial raw acid required is according to formula (1):

[0143] ;

[0144] Among them, the density of 36% hydrochloric acid is 1.18g / cm 3 , the density of 20% hydrochloric acid is 1.10g / cm 3 .

[0145] V w =500-258.94=241.06m 3 ;

[0146] The clean water discharge volume is adjusted on site based on the ratio of industrial raw acid to clean water and the raw acid discharge volume (volume per unit time). For example, if the raw acid inlet discharge volume of 36% is detected, the discharge volume is 2.0m 3 / min, the clean water discharge Qw (without considering the addition of other additives) is:

[0147] Qw=2.0*241.06 / 258.94=1.86m 3 / min.

[0148] The amount of other additives is calculated by mass fraction:

[0149] Gelling agent dosage m1=1.10*500*0.8%*1000=4400kg;

[0150] Corrosion inhibitor dosage m2 = 1.10 * 500 * 3% * 1000 = 16500 kg;

[0151] The amount of iron ion stabilizer m3 = 1.10 * 500 * 0.5% * 1000 = 2750 kg;

[0152] The density of each additive is provided by the manufacturer before acid preparation, or measured indoors. The well ρ2 (corrosion inhibitor) = 1.05g / cm 3 ,ρ3(iron ion stabilizer)=1.0g / cm 3 The volume of clean water required after removing all additives = 241.06-16500 / (1.05*1000)-2750 / (1.0*1000) = 241.06-15.71-2.75 = 222.60m 3 .

[0153] If the discharge volume of 36% original acid at the inlet of the acid distribution system is 2.0m 3 / min, the inlet clean water discharge Qw (considering the volume of other additives added) is:

[0154] Qw=2.0*222.60 / 258.94=1.72m 3 / min.

[0155] Embodiment 6:

[0156] In this embodiment, the acid solution is prepared before acid fracturing in a certain well. The acid solution formula is: 20% hydrochloric acid + 0.8% gelling agent (powder) + 3.0% corrosion inhibitor + 1.0% iron ion stabilizer + 1.0% drainage agent + 0.1% clay stabilizer. According to industry standards and construction design, the acid solution viscosity is required to be ≥30mPa.s and the density is 1.10±0.05g / cm 3 .

[0157] Preparation of the first batch of acid solution: Input the proportion of each additive into the control program according to the formula and start preparing the solution. Online detection shows that the concentration of industrial hydrochloric acid is 35% and the inlet displacement is (1.4-1.5) m 3 / min, automatically adjust the clean water discharge (1.1~1.2)m 3 / min, cumulative pumping of industrial raw acid 64.2m 3 , discharge finished acid 120m 3 , the dosage of powder (gelling agent) is 1050kg, the dosage of corrosion inhibitor is 3950kg, the dosage of iron ion stabilizer is 1320kg, the dosage of drainage agent is 1320kg, and the dosage of clay stabilizer is 130kg. Online detection of acid density (1.097~1.108) g / cm 3 , viscosity (30~36) mPa.s, meets the design requirements.

[0158] Dosage of each additive for the first batch of acid solution:

[0159] project Gelling Agent Corrosion Inhibitor Iron ion stabilizer Drainage aid Clay stabilizer Shimizu Theoretical dosage, kg 1050 3960 1320 1320 132 49.26 Actual amount, kg 1056 3950 1320 1320 130 49.81

[0160] Preparation of the second, third and fourth acid solutions: Online detection of industrial hydrochloric acid concentration 31%, single batch of original acid 64m 3 , inlet displacement (1.2~1.5)m 3 / min, clean water discharge (0.65~0.81)m 3 / min, single batch powder (gelling agent) dosage (920 ~ 935) kg, corrosion inhibitor dosage (3450 ~ 3470) kg, iron ion stabilizer dosage (1150 ~ 1160) kg, drainage agent dosage (1150 ~ 1160) kg, clay stabilizer (115 ~ 117) kg. Online detection of acid density (1.102 ~ 1.120) g / cm 3 , viscosity (30~39) mPa.s, discharged finished acid 105m 3 .

[0161] The amount of additives added to the second, third and fourth batches of acid solution:

[0162] project Gelling agent (powder) Corrosion Inhibitor Iron ion stabilizer Drainage aid Clay stabilizer Display dosage, kg 920～935 3450～3470 1150～1160 1150～1160 115～117 Calculated dosage, kg 924 3465 1155 1155 115.5

[0163] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0164] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0165] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0166] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0167] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large-displacement multifunctional acid liquid preparation and supply integrated system, including a powder tank, a front tank, and a rear tank, characterized in that: The powder tank is connected with the front tank and the rear tank through a jet injection module; The front tank and the rear tank are connected via a bidirectional circulation pipeline; The rear tank is provided with a single circulation pipeline, the bottom of the rear tank is connected to the discharge pipeline, and the top of the rear tank is connected to the clean water pipeline; The powder tank comprises a first tank cavity and a second tank cavity, the bottom of the first tank cavity is communicated with a first screw conveyor, and the bottom of the second tank cavity is communicated with a second screw conveyor; The jet injection module includes a first jet injection pipeline and a third injector; The first jet injection pipeline comprises a first pipeline row, a first liquid pump, a first flow meter, and a first ejector which are connected in sequence, and a first pressure gauge is further arranged between the first liquid pump and the first ejector; The first ejector outlet is in communication with the top of the front tank, and the material inlet of the first ejector is in communication with the first screw conveyor outlet; The bidirectional circulation pipeline includes a top pipeline, a bottom pipeline, and an interconnecting pipeline; The top pipeline is connected with the top of the front tank and the top of the rear tank. The top pipeline is provided with a first control valve, a second control valve, a third flow meter and a third injector in sequence. The first control valve is close to the front tank. The material inlet of the third injector is connected with the second screw conveyor. The bottom pipeline is connected with the bottom of the front tank and the bottom of the rear tank, and a third control valve and a fourth control valve are sequentially arranged on the bottom pipeline, and the third control valve is close to the front tank; The interconnecting pipeline is connected with the top pipeline and the bottom pipeline, the connection point between the interconnecting pipeline and the top pipeline is between the first control valve and the second control valve, the connection point between the interconnecting pipeline and the bottom pipeline is between the third control valve and the fourth control valve, and a third liquid pump is arranged on the interconnecting pipeline; The single-circulation pipeline is connected to the top and bottom of the rear tank, an eighth control valve is provided at one end of the single-circulation pipeline close to the bottom of the rear tank, and a density meter, a viscometer, a concentration meter, and a ninth liquid pump are provided between the eighth control valve and the top of the rear tank.

2. A large-displacement multifunctional acid solution preparation and supply integrated system according to claim 1, characterized in that: The discharge pipeline is connected to the bottom of the rear tank, and a ninth control valve, a fifth liquid pump, and a fifth flow meter are sequentially arranged on the discharge pipeline. The outlet of the discharge pipeline is connected to the fifth pipeline row.

3. The large-displacement multifunctional acid solution preparation and supply integrated system according to claim 1 is characterized in that: One end of the clean water pipeline away from the rear tank is connected to the third pipeline row, and a fourth liquid pump and a fourth flow meter are sequentially arranged on the clean water pipeline; The fourth liquid pump is close to the third pipeline row, and the clean water pipeline is connected with a third pressure gauge between the fourth liquid pump and the fourth flow meter.

4. A large-displacement multifunctional acid solution preparation and supply integrated system according to claim 1, characterized in that: The top of the front tank is provided with a liquid pump group and a first defoamer, and the front tank is provided with a first liquid level gauge and a first agitator; A second defoamer is arranged on the top of the rear tank, and a second liquid level gauge and a second agitator are arranged inside the rear tank; The top of the front tank and the top of the rear tank are connected to the acid mist neutralization tank.

5. The large-displacement multifunctional acid solution preparation and supply integrated system according to claim 2 is characterized in that: The bottom pipeline is connected to a first drain pipeline between the bottom of the front tank and the third control valve, and a first drain valve is provided on the first drain pipeline; The discharge pipeline is connected with the sampling pipeline and the second emptying pipeline between the bottom of the rear tank and the ninth control valve, the sampling pipeline is provided with a sampling valve, and the second emptying pipeline is provided with a second emptying valve; The single circulation pipeline is communicated with the discharge pipeline, and the connection point between the single circulation pipeline and the discharge pipeline is between the bottom of the rear tank and the ninth control valve.

6. A large-displacement multifunctional acid solution preparation and supply integrated system according to claim 2, characterized in that: The bottom pipeline of the bidirectional circulation pipeline is connected with the first liquid medicine pipeline and the second liquid medicine pipeline between the third control valve and the fourth control valve; A fifth control valve and a sixth liquid pump are sequentially arranged on the first liquid medicine pipeline, and the fifth control valve is close to the bottom pipeline; The second liquid medicine pipeline is provided with a sixth control valve and a seventh liquid pump in sequence, and the sixth control valve is close to the bottom pipeline; The discharge pipeline is connected to the mixing pipeline between the ninth control valve and the fifth liquid pump, one end of the mixing pipeline away from the discharge pipeline is connected to the fourth pipeline row, and the mixing pipeline is provided with an eleventh control valve; The discharge pipeline is connected with an auxiliary discharge pipeline between the fourth pressure gauge and the fifth pipeline row, and the auxiliary discharge pipeline is sequentially provided with an eighth liquid pump and a tenth control valve, and the eighth liquid pump is far away from the discharge pipeline.

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