Mixer and dry powder continuous mixing equipment

Abstract

The utility model relates to the technical field of oil field fracturing operation, in particular to a mixer and dry powder continuous mixing equipment. The mixer comprises a first pipe body, a second pipe body and a third pipe body; the first pipe body comprises a bending part and an extending part, the bending part comprises a first opening and a second opening which are located in the two ends, the extending part is communicated with the bending part and extends in the direction away from the second opening, and a first liquid inlet is formed in the first opening; the second pipe body is provided with a first pipe end and a second pipe end in the length direction of the second pipe body, and the first pipe end extends into the cavity of the bending part through the extension part to form a first mixing position; a first powder inlet is formed in the second pipe end; a first liquid outlet is formed in one end of the third pipe body. By adopting the technical scheme, the second pipe body extends into the cavity of the bending part, so that dry powder conveyed by the second pipe body can be mixed with a solvent at a specific position in the cavity, and the mixing effect of the fracturing fluid is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield fracturing operation, in particular to a mixer and a dry powder continuous mixing device. BACKGROUND

[0002] Oilfield fracturing fluid is a key working fluid for increasing production of oil and gas wells and injection of water wells, which is injected into the formation by high pressure to form a fracture and carry proppant to fill, so as to improve the oil and gas flow channel, usually including water-based fracturing fluid, oil-based fracturing fluid and the like.

[0003] The preparation of water-based fracturing fluid is difficult, usually requiring mixing of dry powder such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity, otherwise "fish eyes" or lumps may occur, affecting the use effect of the fracturing fluid.

[0004] Therefore, there is an urgent need in the art for a mixer capable of stably preparing fracturing fluid to solve the above technical problems.

[0005] Therefore, the present application is proposed. SUMMARY

[0006] The present application aims to provide a mixer and a dry powder continuous mixing device to solve at least one technical problem mentioned in the background.

[0007] Specifically, the first aspect of the present application provides a mixer for mixing dry powder with solvent, comprising:

[0008] a first pipe body, a second pipe body and a third pipe body,

[0009] The first pipe body comprises a bending portion and an extension portion, the bending portion comprises a first opening and a second opening at both ends, the extension portion communicates with the bending portion and extends away from the second opening, and the first opening forms a first liquid inlet;

[0010] The second pipe body has a first pipe end and a second pipe end in the length direction, the first pipe end extends into the cavity of the bending portion via the extension portion to form a first mixing position, and the second pipe end forms a first powder inlet;

[0011] The third pipe body communicates with the first opening and forms a first liquid outlet at one end.

[0012] The above technical solution can make the dry powder transported by the second pipe body mixed with the solvent at a specific position inside the cavity, thereby improving the mixing effect of the fracturing fluid.

[0013] Preferably, the bending part is an arc structure, and the arc structure has an inner surface on the inner side and an outer surface on the outer side of the arc structure, and the extending part is formed on the outer surface.

[0014] Preferably, the second pipe body forms a first flow guide structure at the first pipe end, and an outer diameter of the first flow guide structure gradually decreases in a direction away from the first pipe end.

[0015] Preferably, the first flow guide structure is a conical surface, and a taper angle of the conical surface is 10-15°.

[0016] Preferably, the first pipe body is provided with a flow guide ring, and the flow guide ring is located at the first flow guide structure and forms a solvent throttling flow promoting port with the first flow guide structure, so that a passing area of the solvent at the first flow guide structure is smaller.

[0017] Preferably, an end of the third pipe body close to the first opening has a first mixing promoting structure, and an inner diameter of the first mixing promoting structure gradually decreases in a direction away from the first opening.

[0018] Preferably, the first mixing promoting structure is a conical surface, and a taper angle of the conical surface is 10-15°.

[0019] Preferably, an inner diameter of the first liquid inlet is 80-100 mm, and / or an inner diameter of the first powder inlet is 20-40 mm, and / or an inner diameter of the first liquid outlet is 30-80 mm.

[0020] In a second aspect of the present application, a dry powder continuous mixing device is provided, comprising:

[0021] The dry powder storage device comprises a storage tank for storing dry powder,

[0022] The fracturing fluid mixing device comprises a device chamber, and the device chamber comprises a lifting shunt system, and the lifting shunt system comprises a first liquid inlet pipeline, a liquid inlet pump and a first liquid upward pipeline which are sequentially connected, and the liquid inlet pump pumps the liquid in the first liquid inlet pipeline to the dry powder mixing system at a higher position through the first liquid upward pipeline;

[0023] The dry powder mixing system comprises a first mixing mechanism, and the first mixing mechanism comprises a first mixer, a first liquid inlet of the first mixer being connected with the first liquid upward pipeline, and a first powder inlet of the first mixer being connected with the storage tank through a dry powder conveying pipeline; the first mixer forms a negative pressure inside, and is used for mixing the dry powder and the liquid to form a first mixed solution; wherein the first mixer is the mixer of the first aspect of the present application.

[0024] The first mixing mechanism further comprises a first separator detachably connected with the first mixer, the first separator being used for degassing and further mixing the first mixed solution to form a second mixed solution and discharging the second mixed solution from the first discharge outlet out of the equipment room;

[0025] The negative pressure is -0.1 MPa to 0 MPa.

[0026] And,

[0027] The flow rate of the solvent in the pipeline is v1, the inner diameter of the pipeline is d1, and the cavity volume of the first mixer is V1. The above parameters satisfy the following formula:

[0028] V1=v1*π*(d1 / 2) 2 .

[0029] Preferably, the dry powder storage device further comprises a screw conveyor and a buffer bin, the screw conveyor conveying the dry powder in the storage tank to the buffer bin, and the dry powder entering the dry powder conveying pipeline from the first powder outlet of the buffer bin.

[0030] Preferably, the buffer bin has an internal cavity with a certain volume to avoid the dry powder being rapidly extracted, causing discontinuity of dry powder conveying; further, the buffer bin further has a first air inlet arranged opposite to the first powder outlet to provide external atmospheric pressure for the dry powder conveying pipeline.

[0031] Preferably, the storage tank has a fluidized bed arranged at the bottom of the storage tank for conveying the dry powder to the screw conveyor, the screw conveyor being arranged transversely and comprising a second powder inlet in communication with the fluidized bed and a second powder outlet in communication with the buffer bin.

[0032] Preferably, the dry powder continuous mixing equipment further comprises a fixing frame, the fixing frame having a first fixing plate arranged at the top of the fixing frame, and the dry powder storage device being connected with the first fixing plate only through the storage tank at the top of the storage tank.

[0033] Preferably, the fracturing fluid mixing device further comprises an operation room arranged adjacent to the equipment room. The operation room comprises oppositely arranged first and second wall plates, the first wall plate being provided with a lockable first door body for isolating the internal and external environments of the operation room; the equipment room comprises oppositely arranged third and fourth wall plates, the fourth wall plate being provided with a lockable second door body for isolating the internal and external environments of the equipment room, and the first and fourth wall plates being located on opposite sides.

[0034] Preferably, the third wall plate is provided with a first support plate, the first support plate being hinged with the third wall plate and having a first position and a second position, the first support plate being located in a vertical direction when the first support plate is located at the first position, and the first support plate being in a substantially perpendicular angle relationship with the third wall plate when the first support plate is located at the second position.

[0035] Preferably, the first liquid inlet pipeline is connected to the first side of the liquid inlet pump, the first liquid outlet pipeline is connected to the second side of the liquid inlet pump, the first side is adjacent to the second side; the first liquid outlet pipeline comprises a first bending structure and a second bending structure at both ends, and a straight pipeline body between the two.

[0036] Preferably, the first liquid outlet is in communication with the first liquid inlet of the first separator, and the first separator is internally provided with a spiral flow guide vane; the first liquid inlet and the first outlet are eccentrically arranged.

[0037] Preferably, the first separator is provided with a first exhaust pipe near the first liquid inlet at the upper part, the first exhaust pipe is a bending structure, and extends away from the first liquid inlet.

[0038] Preferably, the dry powder mixing system comprises a second mixing mechanism arranged apart from the first mixing mechanism, the second mixing mechanism comprises a second mixer and a second separator arranged in sequence; the second mixer comprises a second powder inlet, a second liquid inlet and a second liquid outlet, the second separator comprises a second liquid inlet, a second outlet and a second exhaust pipe, and the second liquid outlet is in communication with the second liquid inlet; the second mixer is the mixer of the first aspect of the application.

[0039] Preferably, the inner diameter of the first powder inlet is smaller than that of the second powder inlet, and the inner diameter of the first liquid inlet is smaller than that of the second liquid inlet.

[0040] Preferably, the second bending structure is connected to a flow divider at the end, the flow divider divides the water into at least two paths, and the liquid is sent to the first liquid inlet and the second liquid inlet through the first lifting pipeline and the second lifting pipeline respectively, wherein the diameters of the first lifting pipeline and the second lifting pipeline are different.

[0041] Preferably, the equipment room further comprises a lifting mechanism for adjusting the height of the mixing mechanism, the lifting mechanism comprises a driving device and a mounting frame, the driving device comprises a first lifting rod mounted on the third wall plate and a first power device for driving the first lifting rod.

[0042] Preferably, the first lifting rod comprises a fixed rod and a telescopic rod which can be movably connected with the fixed rod, under the driving of the first power device, the telescopic rod can move relative to the fixed rod in the length direction of the telescopic rod and form at least a first position and a second position.

[0043] Preferably, the first mixer and the second mixer are fixedly arranged at one end of the mounting frame close to the third wall plate, and the first separator and the second separator are fixedly arranged at one end of the mounting frame close to the fourth wall plate.

[0044] Preferably, the mounting frame comprises a first horizontal rod, two ends of the first horizontal rod are connected with a first vertical rod and a second vertical rod respectively, the telescopic rod is fixedly connected to a first mounting position of the first horizontal rod, and the mounting frame further comprises a first inclined rod and a second inclined rod, one end of the first inclined rod is fixed to one side of the first mounting position, and the other end is fixed to the first vertical rod, one end of the second inclined rod is fixed to the other side of the first mounting position, and the other end is fixed to the second vertical rod.

[0045] Preferably, the driving device comprises a second lifting rod mounted on the fourth wall plate and a second power device for driving the second lifting rod, the mounting frame comprises a second horizontal rod symmetrically arranged with the first horizontal rod, and the second lifting rod is fixed to the second horizontal rod, two ends of the second horizontal rod are connected with two parallel vertical rods respectively, the second lifting rod is fixedly connected to a second mounting position of the second horizontal rod, and the mounting frame further comprises a third inclined rod and a fourth inclined rod, one end of the third inclined rod and the fourth inclined rod is connected with the two parallel vertical rods respectively, and the other end is fixed to the two sides of the second mounting position respectively.

[0046] Preferably, the mounting frame has an adjustable baffle at the top end, the adjustable baffle comprises a first cover body, a second cover body and a third cover body arranged in sequence, and the first cover body and the third cover body are hingedly connected to the second cover body, so that the first cover body and the third cover body can rotate relative to the second cover body in a direction away from the equipment room.

[0047] Preferably, the mounting frame has a first cavity formed by the top end, the first mixer and the second mixer are arranged in the first cavity, and part of the second pipe body and the third pipe body is located outside the first cavity.

[0048] Preferably, the mounting frame has a horizontally arranged bearing shaft on the side close to the second lifting rod, the first separator and the second separator are respectively provided with a first lug and a second lug on the outer wall, the first lug and the second lug are sleeved on the bearing shaft and can rotate around the bearing shaft.

[0049] In summary, the present application has the following beneficial effects:

[0050] Firstly, the mixer provided by the present application can make the dry powder transported by the second pipe body mixed with the solvent at a specific position inside the cavity, thereby improving the mixing effect of the fracturing fluid.

[0051] Secondly, the mixer provided by the present application can make the solvent flow in the mixer at a more suitable speed by forming the first drainage structure at the first pipe end of the second pipe body, thereby achieving a more stable mixing effect with the dry powder.

[0052] Thirdly, the dry powder continuous mixing device provided by the application can adapt to the fracturing fluid configuration of different scenes and different needs by setting two groups of mixing mechanisms with different specifications, thereby improving the adaptability of the device, and when the two groups of mixing mechanisms are used at the same time, the liquid preparation efficiency can be improved, and the time cost of liquid preparation can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0054] Figure 1 is a sectional view of the mixer in some embodiments of the present application;

[0055] Figure 2 is a sectional view of the mixer in some embodiments of the present application;

[0056] Figure 3 is a schematic diagram of the dry powder continuous mixing device at a first angle in some embodiments of the present application;

[0057] Figure 4 is a schematic diagram of the dry powder continuous mixing device at a second angle in some embodiments of the present application;

[0058] Figure 5 is a side view of the dry powder continuous mixing device in some embodiments of the present application;

[0059] Figure 6 is a schematic diagram of the dry powder storage device in some embodiments of the present application;

[0060] Figure 7 is a schematic diagram of the lifting and shunting system and the dry powder mixing system at a first angle inside the device chamber in some embodiments of the present application;

[0061] Figure 8 is a schematic diagram of the lifting and shunting system and the dry powder mixing system at a second angle inside the device chamber in some embodiments of the present application;

[0062] Figure 9 is a first side view of the fracturing fluid mixing device in some embodiments of the present application;

[0063] Figure 10 is a sectional view of the fracturing fluid mixing device at A-A angle; Figure 9

[0064] Figure 11 is a second side view of the fracturing fluid mixing device in some embodiments of the present application;​

[0065] Figure 12 is a cross-sectional view of the C-C angle; Figure 11

[0066] Figure 13 is a schematic diagram of the inside of the operation room in some embodiments of the present application;

[0067] Figure 14 is a front view of the fracturing fluid mixing device in some embodiments of the present application;

[0068] Figure 15 is a schematic diagram of the support mode of the separator in some embodiments of the present application.

[0069] Explanation of reference signs

[0070] Through the above explanation of reference signs, the technical solutions of the present application can be more clearly understood and explained in combination with the embodiments of the present application.

[0071] 100, dry powder storage device; 110, storage tank; 120, screw conveyor; 130, buffer bin; 131, first powder outlet; 132, first gas inlet;

[0072] 200, fracturing fluid mixing device;

[0073] 210, equipment room;

[0074] 211, lifting and distributing system; 2111, first liquid inlet pipeline; 2112, liquid inlet pump; 2113, first liquid upward pipeline; 21131, first bending structure; 21132, second bending structure; 21133, straight pipeline body; 2114, water inlet; 2115, distributor; 2116, first lifting pipeline; 2117, second lifting pipeline;

[0075] 212, dry powder mixing system; 2121, first mixer; 21211, first powder inlet; 21212, first liquid inlet; 21213, first liquid outlet; 2122, first separator; 21221, first discharge outlet; 21222, first liquid inlet; 21223, first exhaust pipe; 21224, first lug; 2123, second mixer; 21231, second powder inlet; 21232, second liquid inlet; 21233, second liquid outlet; 2124, second separator; 21241, second discharge outlet; 21242, second liquid inlet; 21243, second exhaust pipe; 21244, second lug;

[0076] ​213, lifting mechanism; 2131, mounting frame; 21311, first horizontal rod; 21312, first vertical rod; 21313, second vertical rod; 21314, first inclined rod; 21315, second inclined rod; 21316, second horizontal rod; 2132, first lifting rod; 21321, fixed rod; 21322, telescopic rod; 21323, rocker; 2134, second lifting rod; 2136, first cavity; 2137, bearing shaft; 2138, first support position;

[0077] 214, liquid adding pump;

[0078] 215, third wall plate; 2151, first support plate; 216, fourth wall plate; 2161, second door body;

[0079] 220, operation room; 221, first wall plate; 2211, first door body; 222, second wall plate; 225, distribution box; 226, operation cabinet; 227, temperature adjusting device; 228, flow meter; 230, first partition plate;

[0080] 300, fixing frame; 310, first mounting plate;

[0081] 410, first pipe body; 411, bending part; 4111, first opening; 4112, second opening; 4113, first mixing position; 412, extension part; 420, second pipe body; 421, first pipe end; 422, second pipe end; 423, first drainage result; 430, third pipe body; 431, first mixing promoting structure;

[0082] 501, first cover body; 502, second cover body; 503, third cover body;

[0083] 610, first supporting frame;

[0084] 710, air compressor; 720, dryer; 730, compressed air tank;

[0085] 810, first baffle;

[0086] 900, dry powder delivery pipeline; 910, mixed liquid delivery pipeline. DETAILED DESCRIPTION

[0087] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar elements, unless otherwise represented. The embodiments described in the following exemplary embodiments do not represent all the implementations in accordance with this application. Instead, they only describe example devices and methods in accordance with some aspects of this application, as detailed in the appended claims.

[0088] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or," as used herein, refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0089] The application will be described in detail below with examples.

[0090] Oilfield fracturing fluid is a key working fluid for increasing production of oil and gas wells and injection of water wells. It is injected into the formation under high pressure to form a fracture and carry proppant to fill it, so as to improve the oil and gas flow channel. It usually includes water-based fracturing fluid, oil-based fracturing fluid and the like. The preparation of water-based fracturing fluid is difficult. It is usually necessary to mix dry powder such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity, otherwise "fish eyes" or lumps may occur, affecting the use effect of the fracturing fluid.

[0091] To solve the technical problems of the existing dredging equipment in the background art, the application provides a mixer for mixing dry powder and solvent, which comprises a first pipe body, a second pipe body and a third pipe body. The first pipe body comprises a bending portion and an extension portion. The bending portion comprises a first opening and a second opening at two ends. The extension portion is in communication with the bending portion and extends away from the second opening. A first liquid inlet is formed at the first opening. The second pipe body has a first pipe end and a second pipe end in the length direction. The first pipe end extends into the cavity of the bending portion via the extension portion to form a first mixing position. A first powder inlet is formed at the second pipe end. The third pipe body is in communication with the first opening and forms a first liquid outlet at one end.

[0092] According to the application, the dry powder transported by the second pipe body can be mixed with the solvent at a specific position in the cavity, thereby improving the mixing effect of the fracturing fluid.

[0093] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings and specific embodiments.

[0094] Based on the application, in some preferred embodiments of the application, a mixer for mixing dry powder and solvent is provided, which can be used for preparing oilfield fracturing fluid. The oilfield fracturing fluid is usually a solution with a certain viscosity formed by mixing dry powder and pure water. In some embodiments, the dry powder can be polyacrylamide.

[0095] In some preferred embodiments, the oilfield fracturing fluid further comprises an additive selected from at least one of a crosslinking agent, a pH adjusting agent, and a surfactant.

[0096] Specifically, as shown in the drawings, Figure 1 In some embodiments of the present application, a mixer is provided, which can be a first mixer 2121:

[0097] The first mixer 2121 is composed of a first pipe body 410, a second pipe body 420, and a third pipe body 430. The first pipe body 410 includes a bent portion 411 and an extension portion 412. The bent portion 411 includes a first opening 4111 and a second opening 4112 at two ends. The extension portion 412 is in communication with the bent portion 411 and extends away from the second opening 4112. A first liquid inlet 21212 is formed at the first opening 4111. The second pipe body 420 has a first pipe end 421 and a second pipe end 422 in the length direction. The first pipe end 421 extends into the cavity of the bent portion 411 via the extension portion 412 to form a first mixing position 4113. The liquid transported by the first upper liquid pipe 2113 and the dry powder transported by the dry powder transport pipe 900 are fully mixed at this position. A first powder inlet 21211 is formed at the second pipe end 422. The third pipe body 430 is in communication with the second opening 4112 and forms a first liquid outlet 21213 at one end.

[0098] With the above technical solution, by extending the second pipe body into the cavity of the bent portion, the dry powder transported by the second pipe body can be mixed with the solvent at a specific position inside the cavity, thereby improving the mixing effect of the fracturing fluid.

[0099] In some preferred embodiments, the bent portion 411 has an arc-shaped structure, which has an inner surface on the inner side and an outer surface on the outer side of the arc-shaped structure. The extension portion 412 is formed on the outer surface. With the above technical solution, by introducing the extension portion into the cavity through the outer surface of the bent portion, the flow direction of the solvent entering the cavity from the first liquid inlet can be optimized, and the mixing effect of the dry powder and the solvent can be optimized.

[0100] In some preferred embodiments, the second pipe body 420 forms a first flow guide structure 423 at the first pipe end 421. The outer diameter of the first flow guide structure 423 gradually decreases away from the first pipe end. In some embodiments, the first flow guide structure is a conical surface, and the taper angle of the conical surface is 10-15°. With the above technical solution, by forming the first flow guide structure at the first pipe end of the second pipe body, the solvent can flow at a more appropriate speed in the mixer, thereby achieving a more stable mixing effect with the dry powder.

[0101] In some preferred embodiments, a flow-guiding ring is provided inside the first tube 410. The flow-guiding ring is located at the first flow-guiding structure 423 and forms a solvent throttling and flow-promoting port with the first flow-guiding structure 423. This makes the flow area of ​​the solvent at the first flow-guiding structure 423 smaller after it enters the first tube 410 from the first opening 4111, so as to further increase the flow rate and at the same time play a role in positioning the second tube.

[0102] In some preferred embodiments, reference Figure 2 The third tube 430 has a first mixing-promoting structure 431 at the end near the first opening, and the inner diameter of the first mixing-promoting structure 431 gradually decreases with increasing distance from the first opening. In some embodiments, the first mixing-promoting structure is a conical surface with a taper angle of 10-15°. By employing the above technical solution, by forming a mixing-promoting structure near the first opening in the third tube 430, the mixed solution within the cavity can be more thoroughly mixed in the third tube, achieving a better mixing effect.

[0103] In some preferred embodiments, the inner diameter of the first liquid inlet is 80-100 mm, and / or the inner diameter of the first powder inlet is 20-40 mm, and / or the inner diameter of the first liquid outlet is 30-80 mm. Using the above-mentioned pipe diameters can further optimize the powder, liquid, and liquid inlet rates within the cavity, enabling a dynamic balance of the dry powder solvent volume within the cavity per unit time and improving the mixing effect.

[0104] In some embodiments, the feeding rate of the dry powder is 0.5-100 kg / min, and the feeding rate of the solvent is 0.5-2.5 m / min. 3 / min; the feeding speed is the speed at which dry powder enters the powder inlet of the mixer, and the liquid feeding speed is the speed at which the solution enters the liquid inlet of the mixer.

[0105] In other embodiments of this application, a continuous dry powder mixing device is also provided, such as... Figures 3-5 As shown, it includes:

[0106] The dry powder storage device 100 includes a storage tank 110 for storing dry powder; and a fracturing fluid mixing device 200 for mixing the dry powder with water to form an oilfield fracturing fluid with physical properties that meet the requirements.

[0107] In practice, the fracturing fluid mixing device 200 and the dry powder storage device 100 are set up independently, meaning that the positions of both can be adjusted by the user according to actual needs.

[0108] In some preferred embodiments, reference Figures 7-8The fracturing fluid mixing device 200 comprises a device chamber 210, which comprises a lifting shunt system 211 comprising a first liquid inlet pipeline 2111, a liquid inlet pump 2112 and a first liquid inlet pipeline 2113 connected in sequence, the liquid inlet pump 2112 pumps the liquid in the first liquid inlet pipeline 2111 to the dry powder mixing system 212 at a higher position through the first liquid inlet pipeline 2113, the dry powder mixing system 212 comprises a first powder inlet 21211, a first liquid inlet 21212 and a first outlet 21221, and the first liquid inlet 21212 is connected with the first liquid inlet pipeline 2113; the first powder inlet 21211 is connected with the storage tank 110 through a dry powder conveying pipeline 900.

[0109] In the specific implementation, the dry powder mixing system 212 is farther away from the bottom of the device chamber 210 than the liquid inlet pump 2112, i.e., at a higher position, which is beneficial to fully utilize the space of the device chamber 210, reduce the floor area, and facilitate the pipeline layout of the device chamber or between the device chamber and the dry powder storage device.

[0110] In some preferred embodiments, continuing to refer to Figures 7-8 The dry powder mixing system 212 comprises a first mixing mechanism comprising a first mixer 2121 and a first separator 2122 connected in sequence, the first mixer 2121 forms a negative pressure inside to mix the dry powder with the liquid to form a first mixed solution, and the first separator 2122 is used to degas and further mix the first mixed solution to form a second mixed solution, which is discharged from the first outlet 21221 of the device chamber 210. In some embodiments, the second mixed solution is conveyed to the fracturing truck through a mixed liquid conveying pipeline 910 for final preparation and use of the fracturing fluid; wherein the negative pressure is-0.1MPa~0MPa; and the flow rate of the solvent in the pipeline is v1, the inner diameter of the pipeline is d1, and the cavity volume of the first mixer is V1, and the above parameters satisfy the following formula:

[0111] V1=v1*π*(d1 / 2) 2 .

[0112] By dividing the mixing device into relatively independent storage devices and mixing devices, the above technical solution is beneficial to the assembly and deployment of the device. Further, by detachably arranging the mixer and the separator in the dry powder mixing system, the device can be maintained and transported more conveniently while ensuring the mixing effect of the fracturing fluid.

[0113] In the following embodiments of some aspects, the applicant will describe the dry powder storage device 100 in detail.

[0114] In some preferred embodiments, referring to Figure 6 , the dry powder storage device 100 further comprises a screw conveyor 120 and a buffer bin 130, the screw conveyor 120 transports the dry powder in the storage tank 110 to the buffer bin 130, and the dry powder enters the dry powder conveying pipeline 900 from the first powder outlet 131 of the buffer bin 130.

[0115] In the specific implementation, the buffer bin 130 has an internal cavity with a certain volume to avoid the dry powder being rapidly extracted, causing discontinuity of dry powder conveying; further, the buffer bin 130 also has a first air inlet 132, which can be arranged on the opposite side of the first powder outlet 131, to provide external atmospheric pressure for the dry powder conveying pipeline 900, preventing the formation of negative pressure in the dry powder conveying pipeline 900, affecting the conveying of the dry powder.

[0116] In some preferred embodiments, referring to Figure 6 , the storage tank 110 is approximately funnel-shaped, and a fluidized bed is arranged at the bottom of the storage tank 110 for conveying the dry powder to the screw conveyor 120 and improving the conveying efficiency of the dry powder; in this embodiment, the screw conveyor 120 is arranged transversely and includes a powder inlet communicated with the fluidized bed and a powder outlet communicated with the buffer bin 130, to reduce the influence of gravity during the dry powder conveying process and improve the stability of the dry powder conveying.

[0117] In some preferred embodiments, referring to Figures 3-4 , the dry powder continuous mixing device further comprises a fixed frame 300, and the top of the fixed frame 300 is provided with a first fixed plate 310, and the dry powder storage device 100 is connected to the first fixed plate 310 only through the top of the storage tank 110; because the air pressure is large during the conveying of the dry powder, the pipeline may inevitably vibrate, and the above arrangement can ensure that the dry powder storage device 100 has a certain deformable space at the lower part while being stably fixed, reduce the metal fatigue of the bottom structure of the dry powder storage device 100 during the conveying of the dry powder, and improve the service life of the device.

[0118] In the following embodiments of some aspects, the applicant will describe the fracturing fluid mixing device 200 described in the present application in detail.

[0119] In some preferred embodiments, the fracturing fluid mixing device 200 further comprises an operation room 220 arranged adjacent to the equipment room 210. Referring to Figures 9-14The operation chamber 220 comprises oppositely arranged first wall plate 221 and second wall plate 222, the first wall plate 221 is provided with lockable first door body 2211 for isolating the environment inside and outside the operation chamber 220; the equipment chamber 210 comprises oppositely arranged third wall plate 215 and fourth wall plate 216, the fourth wall plate 216 is provided with lockable second door body 2161 for isolating the environment inside and outside the equipment chamber 210, the first wall plate 221 and the fourth wall plate 216 are located on the opposite sides to avoid the interference between the workers of the equipment chamber and the operation chamber when entering and leaving.

[0120] In some preferred embodiments, referring to Figure 14 The third wall plate 215 is provided with first support plate 2151, the first support plate 2151 is hinged with the third wall plate 215 and has first position and second position, when the first support plate 2151 is located at the first position, it is in vertical direction, when the first support plate 2151 is located at the second position, it is in substantially perpendicular angle relationship with the third wall plate 215, for placing articles, so as to place working or maintenance equipment when maintaining or debugging equipment at oil well work site.

[0121] In some preferred embodiments, referring to Figures 9-14 The operation chamber 220 is provided with power distribution box 225, operation cabinet 226, temperature adjusting device 227 and flow meter 228; the operation chamber 220 and the equipment chamber 210 are provided with first partition plate 230, the first partition plate 230 is provided with observation window; the operation cabinet 226 is arranged close to the first partition plate 230 and comprises display operation panel arranged from top to bottom, operation platform close to horizontal and cabinet body; the flow meter 228 is arranged on the first partition plate 230 and is slightly higher than the top end of the operation cabinet 226, by using the above technical solution, the worker can more conveniently observe the situation inside the equipment chamber when controlling the operation cabinet, which is beneficial to early warning and improves the safety of the equipment.

[0122] Further, the temperature adjusting device 227 can be air conditioner, which is arranged on the second wall plate 222 and is oppositely arranged with the first door body 2211, so as to make the temperature adjustment in the operation chamber more moderate and avoid the adverse effect on the health of the worker.

[0123] In some preferred embodiments, the first liquid inlet pipeline 2111 is connected with at least one upper water inlet 2114, a butterfly valve is arranged at the upper water inlet 2114 for opening and closing the upper water inlet 2114; the first liquid inlet pipeline 2111 is connected with a first side of the liquid inlet pump 2112, and a first liquid outlet pipeline 2113 is connected with a second side of the liquid inlet pump 2112, the first side and the second side are adjacent. The first liquid outlet pipeline 2113 comprises first and second bending structures 21131 and 21132 located at two ends and having the same bending direction, and a straight pipeline body 21133 located between the first and second bending structures 21131 and 21132. By using the above technical scheme, the pipeline arrangement inside the equipment chamber can be more compact, and the utilization rate of the space inside the equipment chamber can be improved.

[0124] In some embodiments, the upper water inlet 2114 comprises four upper water inlets 2114, and the four upper water inlets 2114 are arranged side by side and spaced apart, and are connected in communication with the first liquid inlet pipeline 2111, so as to ensure that the liquid inlet speed meets the liquid preparation demand.

[0125] In some embodiments, the first liquid outlet 21213 of the first mixer 2121 is connected in communication with the first liquid inlet 21222 of the first separator 2122, and the first liquid inlet 21222 and the first liquid outlet 21213 are preferably connected by a pipeline, and the first separator 2122 is internally provided with a spiral flow guide vane for degassing and further mixing of the first mixed solution; in some preferred embodiments, the first liquid inlet 21222 and the first liquid outlet 21221 are eccentrically arranged, so as to improve the degassing effect of the first mixed solution.

[0126] Further, the first separator 2122 is provided with a first exhaust pipe 21223 at a position close to the first liquid inlet 21222 at the upper portion, the first exhaust pipe 21223 is a bending structure and extends away from the first liquid inlet 21222, so as to ensure the exhaust effect.

[0127] In some preferred embodiments, referring to Figures 7-8 , the dry powder mixing system 212 comprises a second mixing mechanism arranged spaced apart from the first mixing mechanism, the second mixing mechanism comprises a second mixer 2123 and a second separator 2124 arranged in sequence and detachably, and the working principle of the second mixing mechanism is similar to that of the first mixing mechanism. The second mixer 2123 comprises a second powder inlet 21231, a second liquid inlet 21232 and a second liquid outlet 21233, the second separator 2124 comprises a second liquid inlet 21242, a second liquid outlet 21241 and a second exhaust pipe 21243, and the second liquid outlet 21233 is connected in communication with the second liquid inlet 21242.

[0128] In some preferred embodiments, the first powder inlet 21211 has a smaller inner diameter than the second powder inlet 21231, and the first liquid inlet 21212 has a smaller inner diameter than the second liquid inlet 21232; further, the second mixer 2123 has a second mixing position similar to the first mixing position 4113, and the cavity at the first mixing position has a smaller inner diameter than the cavity at the second mixing position.

[0129] By adopting the technical scheme, two groups of mixing mechanisms with different specifications are arranged, so that the fracturing fluid configuration can be adapted to different scenes and different needs, and the adaptability of the equipment is improved; when the two groups of mixing mechanisms are used at the same time, the liquid preparation efficiency can be improved, and the time cost of liquid preparation can be effectively reduced.

[0130] In some preferred embodiments, the first liquid inlet pipe 2113 is provided with an electric control valve and an electromagnetic flowmeter at intervals, for controlling and monitoring the liquid inlet flow.

[0131] In some preferred embodiments, with reference to Figures 7-8 , the second bending structure 21132 is connected to a flow divider 2115, the flow divider 2115 divides the liquid into at least two paths, and the liquid is sent to the first liquid inlet 21212 and the second liquid inlet 21232 through the first lifting pipe 2116 and the second lifting pipe 2117 respectively, wherein the diameters of the first lifting pipe 2116 and the second lifting pipe 2117 are different. In some embodiments, the diameter of the first lifting pipe 2116 is DN100 (100mm), and the diameter of the second lifting pipe 2117 is DN80 (80mm); further, the first lifting pipe 2116 and the second lifting pipe 2117 are provided with electric control valves at positions close to the lower ends of the pipes, for controlling the working or stopping of the mixing mechanism.

[0132] In some preferred embodiments, with reference to Figures 9-12 , the device chamber 210 further comprises a lifting mechanism 213 for adjusting the height of the mixing mechanism, the lifting mechanism 213 comprises a driving device and a mounting frame 2131, the driving device comprises a first lifting rod 2132 mounted on the third wall plate 215, and a first power device for driving the first lifting rod 2132. In some embodiments, the first lifting rod 2132 comprises a fixed rod 21321 and a telescopic rod 21322 which can be movably connected to the fixed rod 21321, under the driving of the first power device, the telescopic rod 21322 can move relative to the fixed rod 21321 in the length direction of the fixed rod 21321, and at least a first position and a second position are formed.

[0133] Further, the first mixer 2121 and the second mixer 2123 are fixedly arranged at one end of the mounting rack 2131 close to the third wall plate 215, and the first separator 2122 and the second separator 2124 are fixedly arranged at one end of the mounting rack 2131 close to the fourth wall plate 216. Since the first mixer and the second mixer are to be connected with the dry powder conveying pipeline, and the dry powder conveying pipeline is arranged from bottom to top, the mixers are arranged at the side close to the third wall plate and away from the second door body in the scheme of the embodiment, so as to reduce the interference of the dry powder conveying pipeline on the staff entering the equipment room, and improve the safety of the operation of the equipment.

[0134] It can be understood that the first power device can control the telescopic rod in a manner commonly used in the art. In some embodiments, the fixed rod 21321 is sleeved outside the telescopic rod 21322, and the first power device includes a rocker 21323 at the bottom end of the first lifting rod 2132, and the control of the telescopic rod 21322 is realized by rotating the rocker 21323, and the control mode can be screw transmission or hydraulic transmission, etc. In the above scheme, the rocker is arranged at the bottom of the first lifting rod, which can facilitate the operation of the staff.

[0135] In some preferred embodiments, with continued reference to Figures 9-12 , the top end of the telescopic rod 21322 is fixedly connected with the mounting rack 2131, and the lifting of the mounting rack 2131 is realized by the movement of the telescopic rod 21322. In some embodiments, the mounting rack 2131 includes a first horizontal rod 21311, the two ends of the first horizontal rod 21311 are respectively connected with a first vertical rod 21312 and a second vertical rod 21313, the telescopic rod 21322 is fixedly connected with a first mounting position of the first horizontal rod 21311, and the mounting rack 2131 further includes a first inclined rod 21314 and a second inclined rod 21315, one end of the first inclined rod 21314 is fixed to one side of the first mounting position, and the other end is fixed to the first vertical rod 21312, one end of the second inclined rod 21315 is fixed to the other side of the first mounting position, and the other end is fixed to the second vertical rod 21313. The telescopic rod and the mounting rack are connected in the above scheme, which can ensure the mechanical strength of the mounting rack during lifting, and improve the safety of the equipment.

[0136] In some preferred embodiments, the driving device comprises a second lifting rod 2134 mounted on the fourth wall plate 216, and a second power device for driving the second lifting rod 2134. Similarly, the second lifting rod 2134 is similar to the first lifting rod 2132, comprising a fixed rod, and a telescopic rod capable of being movably connected with the fixed rod, under the driving of the second power device, the telescopic rod is capable of moving relative to the fixed rod in the length direction of the telescopic rod and forming at least two positions, the top end of the telescopic rod is fixedly connected with the mounting frame, and the lifting of the mounting frame is realized by the movement of the telescopic rod. The first lifting rod 2132 and the second lifting rod 2132 are fixedly connected with the mounting frame at corresponding positions, in some embodiments, the mounting frame 2131 comprises a second horizontal rod 21316 symmetrically arranged with the first horizontal rod 21311, both ends of the second horizontal rod 21316 are respectively connected with two parallel vertical rods, the second lifting rod 2132 is fixedly connected with the second mounting position of the second horizontal rod 21316, and the mounting frame 2131 further comprises a third inclined rod and a fourth inclined rod, one end of each of the third inclined rod and the fourth inclined rod is connected with two parallel vertical rods, and the other end of each of the third inclined rod and the fourth inclined rod is fixedly connected with the two sides of the second mounting position, so as to realize the reinforcement of the second horizontal rod. Synchronous driving of the first lifting rod 2132 and the second lifting rod 2134 can make the mounting frame more stably realize the lifting function.

[0137] In some preferred embodiments, with reference to Figure 4 , the top end of the mounting frame 2131 has an adjustable baffle, the adjustable baffle comprises a first cover body 501, a second cover body 502 and a third cover body 503 arranged in sequence, the first cover body 501 and the third cover body 503 are respectively hinged to the second cover body 502, so that the first cover body 501 and the third cover body 503 can be rotated relative to the second cover body 502 in the direction away from the equipment room, in some embodiments, the first cover body 501 and the third cover body 503 can be rotated by 180°, so that the first cover body 501 or the third cover body 503 can be placed on the second cover body 502 in a specific case. The first cover body 501 corresponds to the positions of the first mixer 2121 and the second mixer 2123, and the third cover body 503 corresponds to the positions of the first separator 2122 and the second separator 2124. By using the above technical solution, on the one hand, the first mixing mechanism and the second mixing mechanism can be covered to prevent rain or dust outside from entering the equipment room during work, and the safety of the equipment during work is ensured; on the other hand, when the first cover body 501 and the third cover body 503 are opened, the mixing mechanism can be conveniently maintained or replaced, and the work efficiency is improved.

[0138] In some preferred embodiments, the top end of the mounting frame 2131 encloses a first cavity 2136, the first mixer 2121 and the second mixer 2123 are arranged in the first cavity 2136, and parts of the second pipe 420 and the third pipe 430 are arranged outside the first cavity 2136, so as to be connected with the dry powder conveying pipeline and the separator. By using the above technical scheme, the operation environment of the key structure mixer of the equipment can be further ensured to be stable, thereby improving the mixing effect of the fracturing fluid.

[0139] In some preferred embodiments, with reference to Figure 15 The mounting frame 2131 is provided with a horizontal bearing shaft 2137 near one side of the second lifting rod 2132, the first separator 2122 and the second separator 2124 are respectively provided with a first hanging ear 21224 and a second hanging ear 21244 on the outer wall, the first hanging ear 21224 and the second hanging ear 21244 are sleeved on the bearing shaft 2137 and can rotate around the bearing shaft 2137.

[0140] When the mixing mechanism works, one end of the first separator 2122 is connected with the first mixer 2121, the first hanging ear 21224 abuts against the second cross rod 21316 at the first support position 2138 and is supported by the second cross rod 21316, so that the first separator 2122 can be kept stable under the action of the two positions; similarly, one end of the second separator 2124 is connected with the second mixer 2123, the second hanging ear 21244 abuts against the second cross rod 21316 and is supported by the second cross rod 21316, so that the second separator 2124 can be kept stable under the action of the two positions.

[0141] When the mixing mechanism does not work, the first separator 2122 is disconnected from the first mixer 2121, the first separator 2122 can be rotated around the bearing shaft 2137 through the first hanging ear 21224 to become a vertical state, which is convenient for storage; similarly, the second separator 2124 is disconnected from the second mixer 2123, the second separator 2124 can be rotated around the bearing shaft 2137 through the second hanging ear 21244 to become a vertical state. Since a good separation state needs to be achieved, the volume of the separator is usually large and it is difficult to be directly stored in the equipment room. By using the above technical scheme, when the mixing mechanism does not work, the connector between the separator and the mixer can be disassembled, for example, a nut, and the separator can be rotated to be conveniently stored in the equipment room by the lifting mechanism, which is convenient for transportation or storage of the equipment.

[0142] In some preferred embodiments, with reference to Figure 11The device room 210 is also provided with at least one liquid additive pump 214 for adding materials to the second mixed solution outside the device room 210, such as the sand mixing vehicle. The liquid additive pump 214 is located near the fourth wall plate 216, and the fourth wall plate 216 is provided with a first baffle 810 at a position away from the lower part of the first wall plate 221. The first baffle 810 is hinged to the fourth wall plate 216 and includes an open and closed state. When the first baffle 810 is in the open state, the liquid additive pump 214 inside the device room 210 can access the external pipeline. In some embodiments, at least four liquid additive pumps 214 are provided in the device room 210, which are respectively a first liquid additive pump, a second liquid additive pump, a third liquid additive pump, and a fourth liquid additive pump, and each is provided with an inlet pipeline.

[0143] In some embodiments, the discharge pipelines of the first liquid additive pump and the second liquid additive pump are connected in parallel through an intermediate pipeline, and the intermediate pipeline is provided with a gate. A flow meter such as a mass flow meter is arranged on the discharge pipeline of the first liquid additive pump. When the gate at the end of the discharge pipeline of the second liquid additive pump is closed and the gate of the intermediate pipeline is opened, the first liquid additive pump and the second liquid additive pump share the discharge pipeline of the first liquid additive pump, so that they share the flow meter. When the gate at the end of the discharge pipeline of the second liquid additive pump is opened and the gate of the intermediate pipeline is closed, the second liquid additive pump is used independently. The discharge pipelines of the third liquid additive pump and the fourth liquid additive pump are independently arranged, and each is provided with a flow meter independently arranged on the discharge pipeline. The flow meter can be an electromagnetic or turbine flow meter. By using the above technical solution, the feeding rate of the liquid additive pump can be more flexibly controlled, and the preparation effect of the fracturing fluid can be ensured.

[0144] It can be understood that in some embodiments, the liquid additive pump can be a cam rotor pump, and the displacement is 1-10 m 3 / h; further, the displacement of the first liquid additive pump and the second liquid additive pump is higher than that of the third liquid additive pump and the fourth liquid additive pump.

[0145] In some preferred embodiments, referring to Figure 10 The upper part of the liquid additive pump 214 is provided with a first support frame 610, and the first support frame 610 carries an air compressor 710 and a dryer 720. The air compressor 710 is connected to the dryer 720. The compressed gas is dried by the dryer 720 and then enters a compressed air tank 730 located at the upper part of the dryer 720. The compressed air tank 730 is fixed to the top of the device room 210. The compressed gas enters the compressed air tank 730 and is discharged through an exhaust pipeline. An electric control valve is arranged on the exhaust pipeline, and the exhaust pipeline is connected to the fluidized bed. By using the above technical solution, the air compression system required by the fluidized bed is integrated in the device room, which saves the land occupation of the equipment, improves the overall integration level of the equipment, and is convenient for the configuration and transportation of the equipment.

[0146] In summary, the mixer provided by the embodiment of the present application can make the dry powder transported by the second pipe body mix with the solvent at a specific position inside the cavity, thereby solving the technical problem of poor mixing effect of the fracturing fluid, realizing the automation of the mixing of the fracturing fluid and the improvement of the mixing effect, and having a good application prospect.

[0147] It should be noted that the technical features in the above embodiments can be freely combined, and the formed technical solutions also belong to the disclosed embodiments.

[0148] Further, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A mixer for mixing a dry powder with a solvent, characterised in that: The mixing device comprises: a first tube body, a second tube body, and a third tube body, the first tube body comprises a bending portion and an extending portion, the bending portion comprises a first opening and a second opening at two ends, the extending portion is in communication with the bending portion and extends away from the second opening, and the first opening is provided with a first liquid inlet; the second tube body has a first tube end and a second tube end in the length direction, the first tube end extends into the cavity of the bending portion via the extending portion to form a first mixing position, and the second tube end is provided with a first powder inlet; the third tube body is in communication with the first opening and is provided with a first liquid outlet at one end.

2. The mixing device according to claim 1, wherein: the bending portion is in an arc structure, the arc structure has an inner surface on the inner side and an outer surface on the outer side of the arc structure, and the extending portion is formed on the outer surface.

3. The mixing device according to claim 1, wherein: the second tube body is provided with a first flow guide structure at the first tube end, and the outer diameter of the first flow guide structure gradually decreases away from the first tube end.

4. The mixing device according to claim 3, wherein: the first flow guide structure is a tapered surface, and the taper angle of the tapered surface is 10-15°.

5. The mixing device according to claim 3 or 4, wherein: a flow guide ring is arranged in the first tube body, the flow guide ring is located at the first flow guide structure and forms a solvent throttling flow promoting port with the first flow guide structure, so that the passing area of the solvent at the first flow guide structure is smaller.

6. The mixing device according to claim 1, wherein: the third tube body is provided with a first mixing promoting structure at one end close to the first opening, and the inner diameter of the first mixing promoting structure gradually decreases away from the first opening.

7. The mixing device according to claim 1, wherein: the inner diameter of the first liquid inlet is 80-100 mm, the inner diameter of the first powder inlet is 20-40 mm, and the inner diameter of the first liquid outlet is 30-80 mm.

8. A continuous dry powder compounding apparatus, characterized by: The mixing device comprises: a dry powder storage device comprising a storage tank for storing dry powder, a fracturing fluid mixing device comprising a device chamber, the device chamber comprises a lifting shunt system, the lifting shunt system comprises a first liquid inlet pipeline, a liquid inlet pump and a first liquid upward pipeline in sequence, the liquid inlet pump pumps the liquid in the first liquid inlet pipeline to the dry powder mixing system at a higher position through the first liquid upward pipeline; the dry powder mixing system comprises a first mixing mechanism, the first mixing mechanism comprises a first mixer, the first liquid inlet of the first mixer is in communication with the first liquid upward pipeline, the first powder inlet is in communication with the storage tank through a dry powder conveying pipeline, and the first mixer forms a negative pressure inside to mix the dry powder and the liquid to form a first mixed solution; wherein the first mixer is the mixing device according to any one of claims 1-7; the first mixing mechanism further comprises a first separator detachably connected with the first mixer, the first separator is used for degassing and further mixing the first mixed solution to form a second mixed solution, and the second mixed solution is discharged from a first discharge port out of the device chamber. The negative pressure is -0.1 MPa to 0 MPa. And, The flow rate of the solvent in the pipeline is v1, the inner diameter of the pipeline is d1, and the cavity volume of the first mixer is V1, and the above parameters satisfy the following formula: V1 = v1 * π * (d1 / 2) 2 .

9. The dry powder continuous mixing device according to claim 8, characterized in that: The dry powder mixing system comprises a second mixing mechanism arranged in a spaced manner with the first mixing mechanism, and the second mixing mechanism comprises a second mixer and a second separator arranged in sequence and detachably; the second mixer comprises a second powder inlet, a second liquid inlet and a second liquid outlet; the second separator comprises a second liquid inlet, a second outlet and a second exhaust pipe; the second liquid outlet is in communication with the second liquid inlet; and the second mixer is the mixer of the first aspect of the application.

10. The dry powder continuous mixing device according to claim 8, characterized in that: The device chamber further comprises a lifting mechanism for adjusting the height of the mixing mechanism, and the lifting mechanism comprises a driving device and a mounting frame; the driving device comprises a first lifting rod mounted on the third wall plate and a first power device for driving the first lifting rod; and the mounting frame has an adjustable baffle at the top end; the adjustable baffle comprises first, second and third covers arranged in sequence; and the first and third covers are hingedly connected to the second cover, so that the first and third covers can rotate relative to the second cover away from the device chamber.

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