Dry powder continuous mixing equipment

Abstract

The invention relates to the technical field of oil field fracturing operation, in particular to dry powder continuous mixing equipment which comprises a dry powder storage device and a dry powder mixing device. The fracturing fluid mixing device comprises an equipment chamber, the equipment chamber comprises a lifting and distributing system, the lifting and distributing system comprises a first liquid inlet pipeline, a liquid inlet pump and a first liquid feeding pipeline which are communicated in sequence, and the liquid inlet pump pumps liquid in the first liquid inlet pipeline to a dry powder mixing system located at a higher position through the first liquid feeding pipeline; the dry powder mixing system comprises a first mixer and a first separator which are detachably arranged in sequence, and negative pressure is formed in the first mixer and used for mixing dry powder and liquid to form a first mixed solution. With the adoption of the technical scheme, the mixer and the separator in the dry powder mixing system are detachably arranged, so that the fracturing fluid mixing effect can be ensured, and meanwhile, the maintenance and the transportation of equipment are more convenient.

Description

Technical Field

[0001] This application relates to the technical field of oilfield fracturing operations, and specifically, to a dry powder continuous mixing device. Background Art

[0002] Oilfield fracturing fluid is a key working fluid for enhancing oil and gas production in oil and gas wells and water injection in water wells. It forms fractures by high-pressure injection into the formation and carries proppants to fill them, so as to improve the oil and gas flow channels. It usually includes types such as water-based fracturing fluid and oil-based fracturing fluid.

[0003] Water-based fracturing fluid is usually prepared manually by mixing dry powder such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity. In the prior art, there have gradually emerged devices for preparing fracturing fluid, but the equipment layout is unreasonable and the preparation efficiency is low.

[0004] Therefore, there is an urgent need in this field for a device that can efficiently mix fracturing fluid to solve the above technical problems.

[0005] In view of this, this application is proposed. Summary of the Invention

[0006] The purpose of this application is to provide a dry powder continuous mixing device to solve at least one of the technical problems mentioned in the background art.

[0007] Specifically, in the first aspect of this application, a dry powder continuous mixing device is provided, including:

[0008] A dry powder storage device, including a storage tank for storing dry powder,

[0009] A fracturing fluid mixing device, including an equipment chamber. The equipment chamber includes a lifting and shunting system. The lifting and shunting system includes a first liquid inlet pipeline, a liquid inlet pump, and a first liquid supply pipeline that are connected in sequence. The liquid inlet pump pumps the liquid in the first liquid inlet pipeline through the first liquid supply pipeline to a dry powder mixing system at a higher position. The dry powder mixing system includes a first powder inlet, a first liquid inlet, and a first discharge port. The first liquid inlet is connected to the first liquid supply pipeline; the first powder inlet is connected to the storage tank through a dry powder conveying pipeline;

[0010] Wherein, the dry powder mixing system includes a first mixer and a first separator that are detachably arranged in sequence. A negative pressure is formed inside the first mixer for mixing dry powder and liquid to form a first mixed solution; the first separator is used for degassing and further mixing the first mixed solution to form a second mixed solution, and discharging the second mixed solution out of the equipment chamber through the first discharge port.

[0011] Adopting the above technical solution, by dividing the mixing equipment into relatively independent storage devices and mixing devices, it is more convenient for the assembly and deployment of the equipment; further, by detachably arranging the mixer and separator in the dry powder mixing system, while ensuring the mixing effect of the fracturing fluid, it is more convenient for the maintenance and transportation of the equipment.

[0012] Preferably, the dry powder storage device further includes a screw conveyor and a buffer bin. The screw conveyor transports the dry powder in the storage tank to the buffer bin and enters the dry powder conveying pipeline from the first powder outlet of the buffer bin.

[0013] Preferably, the buffer bin has an internal cavity with a certain volume to prevent the dry powder from being quickly extracted and causing discontinuous dry powder transportation; further, the buffer bin also has a first air inlet, which is arranged on the opposite side of the first powder outlet to provide external atmospheric pressure for the dry powder conveying pipeline.

[0014] Preferably, a fluidized bed is arranged at the bottom of the storage tank for transporting the dry powder to the screw conveyor. The screw conveyor is arranged horizontally and includes a second powder inlet communicated with the fluidized bed and a second powder outlet communicated with the buffer bin.

[0015] Preferably, the dry powder continuous mixing equipment further includes a fixing frame. A first fixing plate is arranged at the top of the fixing frame, and the dry powder storage device is only connected to the first fixing plate through the top of the storage tank.

[0016] Preferably, the fracturing fluid mixing device further includes an operation room adjacent to the equipment room. The operation room includes a first wall plate and a second wall plate arranged opposite to each other. The first wall plate is provided with a lockable first door body for isolating the internal environment of the operation room from the external environment; the equipment room includes a third wall plate and a fourth wall plate arranged opposite to each other. The fourth wall plate is provided with a lockable second door body for isolating the internal environment of the equipment room from the external environment. The first wall plate and the fourth wall plate are located on two opposite sides.

[0017] Preferably, the third wall plate is provided with a first support plate. The first support plate is hinged to the third wall plate and has a first position and a second position. When the first support plate is in the first position, it is in the vertical direction. When the first support plate is in the second position, it has a substantially perpendicular angular relationship with the third wall plate. <000004

[0018] Preferably, a distribution box, an operation cabinet, a temperature regulating device, and a flowmeter are arranged in the operation room; a first partition board is arranged between the operation room and the equipment room. An observation window is arranged on the first partition board; the operation cabinet is arranged close to the first partition board and includes a display operation panel arranged from top to bottom, an operation platform close to the horizontal, and a cabinet body; the flowmeter is arranged on the first partition board and is slightly higher than the top end of the operation cabinet.

[0019] Preferably, the first liquid inlet pipeline is connected to the first side of the liquid inlet pump, and the second side of the liquid inlet pump is connected to the first liquid supply pipeline. The first side and the second side are adjacent; the first liquid supply pipeline includes first bending structures at both ends, a second bending structure, and a straight pipe body located therebetween.

[0020] Preferably, the first mixer includes a first powder inlet, a first liquid inlet, and a first liquid outlet. The first separator includes a first liquid inlet, a first discharge port, and a first exhaust pipe. The first liquid outlet is communicated with the first liquid inlet.

[0021] Preferably, the first mixer is composed of a first pipe body, a second pipe body, and a third pipe body. The first pipe body includes a bending portion and an extending portion. The bending portion includes a first opening and a second opening at both ends. The extending portion is communicated with the bending portion and extends in a direction away from the second opening. The first opening forms the first liquid inlet; the second pipe body has a first pipe end and a second pipe end in its length direction. The first pipe end extends into the cavity of the bending portion through the extending portion to form a first mixing position; the second pipe end forms the first powder inlet; the third pipe body is communicated with the first opening and forms a first liquid outlet at one end thereof.

[0022] Preferably, the first liquid outlet is communicated with the first liquid inlet of the first separator, and a spiral guide vane is arranged inside the first separator; the first liquid inlet and the first discharge port are eccentrically arranged.

[0023] Preferably, a first exhaust pipe is arranged at a position near the first liquid inlet at the upper part of the first separator. The first exhaust pipe is of a bending structure and extends in a direction away from the first liquid inlet.

[0024] Preferably, the dry powder mixing system includes a second mixing mechanism arranged at an interval from the first mixing mechanism. The second mixing mechanism sequentially includes a second mixer and a second separator which are detachably arranged; wherein, the second mixer includes a second powder inlet, a second liquid inlet, and a second liquid outlet. The second separator includes a second liquid inlet, a second discharge port, and a second exhaust pipe. The second liquid outlet is communicated with the second liquid inlet.

[0025] 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.

[0026] Preferably, the end of the second bending structure is connected to a flow divider. The flow divider divides the upper water into at least two paths, and sends the liquid to the first liquid inlet and the second liquid inlet respectively through a first lifting pipeline and a second lifting pipeline. Among them, the inner diameters of the first lifting pipeline and the second lifting pipeline are different.

[0027] Preferably, the equipment chamber further includes a lifting mechanism for adjusting the height of the mixing mechanism. The lifting mechanism includes a driving device and a mounting rack. The driving device includes a first lifting rod installed on the third wall panel and a first power device for driving the first lifting rod.

[0028] Preferably, the first lifting rod includes a fixed rod and a telescopic rod that can be movably connected to the fixed rod. Driven by the first power device, the telescopic rod can move relative to the fixed rod in its length direction and form at least a first position and a second position.

[0029] Preferably, the first mixer and the second mixer are fixedly arranged at one end of the mounting rack close to the third wall panel, and the first separator and the second separator are fixedly arranged at one end of the mounting rack close to the fourth wall panel.

[0030] Preferably, the mounting rack includes a first cross bar. The two ends of the first cross bar are respectively connected to a first vertical bar and a second vertical bar. The telescopic rod is fixedly connected to a first mounting position of the first cross bar. The mounting rack further includes a first diagonal bar and a second diagonal bar. One end of the first diagonal bar is fixed to one side of the first mounting position, and the other end is fixed to the first vertical bar. One end of the second diagonal bar is fixed to the other side of the first mounting position, and the other end is fixed to the second vertical bar.

[0031] Preferably, the driving device includes a second lifting rod installed on the fourth wall panel and a second power device for driving the second lifting rod. The mounting rack includes a second cross bar symmetrically arranged with the first cross bar. The second lifting rod is fixed to the second cross bar. The two ends of the second cross bar are respectively connected to two parallel vertical bars. The second lifting rod is fixedly connected to a second mounting position of the second cross bar. The mounting rack further includes a third diagonal bar and a fourth diagonal bar. One end of each of the third diagonal bar and the fourth diagonal bar is connected to one of the two parallel vertical bars, and the other end is respectively fixed to both sides of the second mounting position.

[0032] Preferably, the top end of the mounting rack has an adjustable baffle. The adjustable baffle includes a first cover body, a second cover body, and a third cover body arranged in sequence. The first cover body and the third cover body are respectively hinged to the second cover body, so that both the first cover body and the third cover body can rotate away from the equipment chamber relative to the second cover body.

[0033] Preferably, the top end of the mounting rack encloses a first cavity. The first mixer and the second mixer are arranged through the first cavity, and part of the second pipe body and the third pipe body is located outside the first cavity.

[0034] Preferably, one side of the mounting frame close to the second lifting rod has a horizontally arranged bearing shaft. The first separator and the second separator are respectively provided with a first hanging ear and a second hanging ear on their outer walls. The first hanging ear and the second hanging ear are sleeved on the bearing shaft and can rotate around the bearing shaft.

[0035] Preferably, at least one liquid addition pump is further arranged in the equipment room. The liquid addition pump is located at a position close to the fourth wall panel. A first baffle is arranged at a lower position of the fourth wall panel far from the first wall panel. The first baffle is hinged to the fourth wall panel and includes an open state and a closed state. When it is in the open state, the liquid addition pump inside the equipment room can be connected to an external pipeline.

[0036] Preferably, a first support frame is arranged above the liquid addition pump. An air compressor and a dryer are carried on the upper part of the first support frame. The air compressor is connected to the dryer. Compressed gas enters a compressed air tank located above the dryer after being dried by the dryer. The compressed air tank is fixed to the top of the equipment room. After the compressed gas enters the compressed air tank, it is discharged through an exhaust pipeline. The exhaust pipeline is connected to the fluidized bed.

[0037] In summary, the present application has the following beneficial effects:

[0038] First, for the dry powder continuous mixing equipment provided by the present application, by dividing the mixing equipment into relatively independent storage devices and mixing devices, it is more convenient for the assembly and deployment of the equipment; further, by detachably arranging the mixer and the separator in the dry powder mixing system, while ensuring the mixing effect of the fracturing fluid, it is more convenient for the maintenance and transportation of the equipment.

[0039] Second, for the dry powder continuous mixing equipment provided by the present application, by setting two groups of mixing mechanisms with different specifications, it can adapt to the preparation of fracturing fluids in different scenarios and different requirements, improving the adaptability of the equipment. When the two groups of mixing mechanisms are used simultaneously, it can also improve the liquid preparation efficiency and effectively reduce the time cost of liquid preparation.

[0040] Third, for the dry powder continuous mixing equipment provided by the present application, by setting a lifting mechanism, it is convenient for the operation of the mixing mechanism. Further, when the mixing mechanism is not in operation, the connector between the separator and the mixer can be disassembled, and it can be conveniently received into the equipment room through the lifting mechanism, facilitating the transportation or storage of the equipment. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 Schematic diagram of the dry powder continuous mixing equipment at the first angle in some embodiments of the present application;

[0043] Figure 2 Schematic diagram of the dry powder continuous mixing equipment at the second angle in some embodiments of the present application;

[0044] Figure 3 Side view of the dry powder continuous mixing equipment in some embodiments of the present application;

[0045] Figure 4 Schematic diagram of the dry powder storage device in some embodiments of the present application;

[0046] Figure 5 Schematic diagram of the lifting and shunting system and the dry powder mixing system at the first angle inside the equipment room in some embodiments of the present application;

[0047] Figure 6 Schematic diagram of the lifting and shunting system and the dry powder mixing system at the second angle inside the equipment room in some embodiments of the present application;

[0048] Figure 7 First side view of the fracturing fluid mixing device in some embodiments of the present application;

[0049] Figure 8 is Figure 7 Cross-sectional view taken along the A-A angle of

[0050] Figure 9 Second side view of the fracturing fluid mixing device in some embodiments of the present application;

[0051] Figure 10 is Figure 9 Cross-sectional view taken along the C-C angle of

[0052] Figure 11 Schematic diagram of the inside of the operation room in some embodiments of the present application;

[0053] Figure 12 Front view of the fracturing fluid mixing device in some embodiments of the present application;

[0054] Figure 13 Schematic diagram of the support method of the separator in some embodiments of the present application;

[0055] Figure 14 Cross-sectional view of the mixer in some embodiments of the present application.

[0056] Description of reference numerals

[0057] Through the above description of the attached drawing reference numerals, in combination with the embodiments of the present application, the technical solution of the present application can be understood and described more clearly.

[0058] 100, dry powder storage device; 110, storage tank; 120, screw conveyor; 130, buffer bin; 131, first powder outlet; 132, first air inlet;

[0059] 200, fracturing fluid mixing device;

[0060] 210, equipment room;

[0061] 211, lifting and shunting system; 2111, first liquid inlet pipeline; 2112, liquid inlet pump; 2113, first liquid supply pipeline; 21131, first bending structure; 21132, second bending structure; 21133, straight pipe body; 2114, water inlet; 2115, shunt; 2116, first lifting pipeline; 2117, second lifting pipeline;

[0062] 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 port; 21222, first liquid inlet; 21223, first exhaust pipe; 21224, first hanging ear; 2123, second mixer; 21231, second powder inlet; 21232, second liquid inlet; 21233 second liquid outlet; 2124, second separator; 21241, second discharge port; 21242, second liquid inlet; 21243, second exhaust pipe; 21244, second hanging ear;

[0063] 213, lifting mechanism; 2131, mounting frame; 21311, first cross bar; 21312, first vertical bar; 21313, second vertical bar; 21314, first diagonal bar; 21315, second diagonal bar; 21316, second cross bar; 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;

[0064] 214, liquid addition pump;

[0065] 215, third wall panel; 2151, first support plate; 216, fourth wall panel; 2161, second door body;

[0066] 220, operation room; 221, first wall panel; 2211, first door body; 222, second wall panel; 225, distribution box; 226, operation cabinet; 227, temperature regulating device; 228, flowmeter; 230, first partition board;

[0067] 300, Fixing bracket; 310, First mounting plate;

[0068] 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; 430, Third pipe body;

[0069] 501, First cover body; 502, Second cover body; 503, Third cover body;

[0070] 610, First support bracket;

[0071] 710, Air compressor; 720, Dryer; 730, Compressed air tank;

[0072] 810, First baffle;

[0073] 900, Dry powder delivery pipeline; 910, Mixed liquid delivery pipeline. Detailed implementation manners

[0074] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0075] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0076] The present application will be described in detail below through embodiments.

[0077] Oilfield fracturing fluid is a key working fluid for increasing production of oil and gas wells and injection of water wells. It forms fractures by high-pressure injection into the formation and carries proppants to fill them, so as to improve the oil and gas flow channels. It usually includes types such as water-based fracturing fluid and oil-based fracturing fluid. Water-based fracturing fluid is usually prepared manually by mixing dry powder such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity. In the prior art, there have gradually appeared devices for preparing fracturing fluid, but the equipment layout is unreasonable and the preparation efficiency is low.

[0078] To solve the technical problems existing in the existing dredging equipment in the background art, the inventive concept of this application is to provide a dry powder continuous mixing equipment to solve at least one of the technical problems mentioned in the background art. The dry powder continuous mixing equipment includes: a dry powder storage device, including a storage tank for storing dry powder; a fracturing fluid mixing device, including an equipment room, the equipment room includes a lifting and shunting system, the lifting and shunting system includes a first liquid inlet pipeline, a liquid inlet pump, and a first liquid supply pipeline connected in sequence. The liquid inlet pump pumps the liquid in the first liquid inlet pipeline through the first liquid supply pipeline to a dry powder mixing system at a higher position. The dry powder mixing system includes a first powder inlet, a first liquid inlet, and a first discharge port. The first liquid inlet is connected to the first liquid supply pipeline; the first powder inlet is connected to the storage tank through a dry powder delivery pipeline; wherein, the dry powder mixing system includes a first mixer and a first separator detachably arranged in sequence. The first mixer forms a negative pressure inside to mix dry powder and liquid to form a first mixed solution; the first separator is used to degas and further mix the first mixed solution to form a second mixed solution and discharge it from the first discharge port out of the equipment room.

[0079] According to this inventive concept, by dividing the mixing equipment into relatively independent storage devices and mixing devices, it is more convenient for the assembly and deployment of the equipment; further, by detachably arranging the mixer and separator in the dry powder mixing system, while ensuring the mixing effect of the fracturing fluid, it is more convenient for the maintenance and transportation of the equipment.

[0080] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation manners.

[0081] Based on the inventive concept of this application, in some preferred embodiments of this application, a dry powder continuous mixing equipment is provided for preparing oilfield fracturing fluid. The oilfield fracturing fluid is usually formed by mixing dry powder and pure water to form a solution with a certain viscosity; in some embodiments, the dry powder can be polyacrylamide.

[0082] In some preferred embodiments, the oilfield fracturing fluid further includes an additive, and the additive is selected from at least one of a crosslinking agent, a pH regulator, and a surfactant.

[0083] Specifically, as Figures 1 - 3 shown, the dry powder continuous mixing equipment includes:

[0084] A dry powder storage device 100, including a storage tank 110 for storing dry powder; a fracturing fluid mixing device 200 for mixing dry powder and water to form an oilfield fracturing fluid with physical properties meeting the requirements.

[0085] In the specific implementation process, the fracturing fluid mixing device 200 and the dry powder storage device 100 are independently arranged, that is, the positions of both can be adjusted by the user according to actual needs.

[0086] In some preferred embodiments, referring to Figures 5 - 6 , the fracturing fluid mixing device 200 includes an equipment room 210, the equipment room 210 includes a lifting and shunting system 211, the lifting and shunting system 211 includes a first liquid inlet pipeline 2111, a liquid inlet pump 2112, and a first liquid supply pipeline 2113 that are connected in sequence. The liquid inlet pump 2112 pumps the liquid in the first liquid inlet pipeline 2111 through the first liquid supply pipeline 2113 to the dry powder mixing system 212 located at a higher position. The dry powder mixing system 212 includes a first powder inlet 21211, a first liquid inlet 21212, and a first discharge port 21221. The first liquid inlet 21212 is connected to the first liquid supply pipeline 2113; the first powder inlet 21211 is connected to the storage tank 110 through a dry powder delivery pipeline 900.

[0087] In the specific implementation process, the dry powder mixing system 212 is farther from the bottom of the equipment room 210 relative to the liquid inlet pump 2112, that is, at a higher position. Such a setting is beneficial to making full use of the space of the equipment room 210, reducing the floor area, and at the same time facilitating the pipeline layout between the equipment room or it and the dry powder storage device.

[0088] In some preferred embodiments, continuing to refer to Figures 5 - 6 , the dry powder mixing system 212 includes a first mixing mechanism, and the first mixing mechanism sequentially includes a first mixer 2121 and a first separator 2122 that are detachably arranged. A negative pressure is formed inside the first mixer 2121 for mixing dry powder and liquid to form a first mixed solution; the first separator 2122 is 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 port 21221 out of the equipment room 210. In some embodiments, the second mixed solution will be transported to a blender truck through a mixed liquid delivery pipeline 910 for the final preparation and use of the fracturing fluid.

[0089] By adopting the above technical solutions, by dividing the mixing equipment into relatively independent storage devices and mixing devices, it is more convenient for the assembly and deployment of the equipment; further, by detachably arranging the mixer and separator in the dry powder mixing system, while ensuring the mixing effect of the fracturing fluid, it is more convenient for the maintenance and transportation of the equipment.

[0090] In the embodiments of the following aspects, the applicant will describe the dry powder storage device 100 described in this application in detail.

[0091] In some preferred embodiments, referring toFigure 4 The dry powder storage device 100 further includes a screw conveyor 120 and a buffer bin 130. The screw conveyor 120 conveys the dry powder in the storage tank 110 to the buffer bin 130 and enters the dry powder conveying pipeline 900 from the first powder outlet 131 of the buffer bin 130.

[0092] In the specific implementation process, the buffer bin 130 has an internal cavity with a certain volume to prevent the dry powder from being quickly extracted and causing discontinuous 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 and prevent the formation of negative pressure in the dry powder conveying pipeline 900, which affects the conveying of dry powder.

[0093] In some preferred embodiments, continue to refer to Figure 4 The storage tank 110 is approximately funnel-shaped, and a fluidized bed is arranged at its bottom to convey the dry powder to the screw conveyor 120 and improve the conveying efficiency of the dry powder. In this embodiment, the screw conveyor 120 is arranged horizontally and includes a powder inlet communicating with the fluidized bed and a powder outlet communicating with the buffer bin 130 to reduce the influence of gravity during this section of dry powder conveying and improve the stability of dry powder conveying.

[0094] In some preferred embodiments, refer to Figures 1 - 2 The dry powder continuous mixing equipment further includes a fixing frame 300. A first fixing plate 310 is arranged at the top of the fixing frame 300. The dry powder storage device 100 is only connected to the first fixing plate 310 through the top of the storage tank 110. Since the air pressure is relatively large during dry powder conveying, the pipeline may inevitably vibrate. The above setting can ensure that the dry powder storage device 100 has a certain deformable space at its lower part while being stably fixed, reduce the metal fatigue of the bottom structure of the dry powder storage device 100 during dry powder conveying, and improve the service life of the equipment.

[0095] In the following embodiments of some aspects, the applicant will describe the fracturing fluid mixing device 200 described in the present application in detail.

[0096] In some preferred embodiments, the fracturing fluid mixing device 200 further includes an operation room 220 adjacent to the equipment room 210. Refer to Figures 7 - 12, the operation room 220 includes a first wall panel 221 and a second wall panel 222 which are oppositely arranged. The first wall panel 221 is provided with a lockable first door 2211 for isolating the internal environment of the operation room 220 from the external environment; the equipment room 210 includes a third wall panel 215 and a fourth wall panel 216 which are oppositely arranged. The fourth wall panel 216 is provided with a lockable second door 2161 for isolating the internal environment of the equipment room 210 from the external environment. The first wall panel 221 and the fourth wall panel 216 are located on two opposite sides to prevent interference between the staff in the equipment room and the operation room when entering and leaving.

[0097] In some preferred embodiments, referring to Figure 12 , the third wall panel 215 is provided with a first support plate 2151. The first support plate 2151 is hinged to the third wall panel 215 and has a first position and a second position. When the first support plate 2151 is in the first position, it is in the vertical direction. When the first support plate 2151 is in the second position, it forms a substantially perpendicular angular relationship with the third wall panel 215 for placing items, so as to place working or maintenance equipment when repairing or debugging equipment at the oil well work site.

[0098] In some preferred embodiments, referring to Figures 7 - 12 , a distribution box 225, an operation cabinet 226, a temperature regulating device 227, and a flowmeter 228 are arranged in the operation room 220; a first partition plate 230 is arranged between the operation room 220 and the equipment room 210. An observation window is arranged on the first partition plate 230; the operation cabinet 226 is arranged close to the first partition plate 230 and includes a display operation panel, an operation platform close to the horizontal, and a cabinet body arranged from top to bottom; the flowmeter 228 is arranged on the first partition plate 230 and is slightly higher than the top end of the operation cabinet 226. With the above technical solutions, it is possible for the staff to more conveniently observe the internal situation of the equipment room when controlling the operation cabinet, which is beneficial for early warning and improving the safety of the equipment.

[0099] Furthermore, the temperature regulating device 227 can be an air conditioner, which is arranged on the second wall panel 222 and is oppositely arranged to the first door 2211, so that the temperature regulation in the operation room is more gentle and the health of the staff is not adversely affected.

[0100] In some preferred embodiments, the first liquid inlet pipeline 2111 is connected to at least one water inlet 2114, and a butterfly valve is provided at the water inlet 2114 for opening and closing the water inlet 2114; the first liquid inlet pipeline 2111 is connected to the first side of the liquid inlet pump 2112, and the second side of the liquid inlet pump 2112 is connected to the first liquid supply pipeline 2113, and the first side and the second side are adjacent. The first liquid supply pipeline 2113 includes first bending structures 21131 and 21132 located at both ends and having the same bending direction, and a straight pipe body 21133 located therebetween. By adopting the above technical solution, the pipeline layout inside the equipment room can be made more compact, and the utilization rate of the space inside the equipment room can be improved.

[0101] In some embodiments, there are 4 water inlets 2114, and the 4 water inlets 2114 are arranged in parallel and at intervals, and are connected to the first liquid inlet pipeline 2111 at the same time to ensure that the liquid inlet speed meets the liquid preparation requirements.

[0102] In some preferred embodiments, as Figures 5 - 6 shown, the first mixer 2121 includes a first powder inlet 21211, a first liquid inlet 21212, and a first liquid outlet 21213. The first separator 2122 includes a first liquid inlet 21222 and a first discharge port 21221. The first liquid outlet 21213 is connected to the first liquid inlet 21222.

[0103] Specifically, in some embodiments, referring to Figure 14 , 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 bending portion 411 and an extending portion 412. The bending portion 411 includes a first opening 4111 and a second opening 4112 at both ends. The extending portion 412 is communicated with the bending portion 411 and extends in a direction away from the second opening 4112. The first opening 4111 forms the first liquid inlet 21212. The second pipe body 420 has a first pipe end 421 and a second pipe end 422 in its length direction. The first pipe end 421 extends into the cavity of the bending portion 411 through the extending portion 412 to form a first mixing position 4113. The liquid conveyed by the first liquid supply pipeline 2113 and the dry powder conveyed by the dry powder conveying pipeline 900 are fully mixed at this position. The second pipe end 422 forms the first powder inlet 21211. The third pipe body 430 is communicated with the second opening 4112 and forms a first liquid outlet 21213 at one end.

[0104] In some embodiments, the first liquid outlet 21213 is in communication with the first liquid inlet 21222 of the first separator 2122. Preferably, the two are connected by a union. A spiral guide vane is provided inside the first separator 2122 to achieve degassing and further mixing of the first mixed solution. In some preferred embodiments, the first liquid inlet 21222 and the first discharge port 21221 are eccentrically arranged to improve the degassing effect of the first mixed solution.

[0105] Further, a first exhaust pipe 21223 is provided at a position near the first liquid inlet 21222 in the upper part of the first separator 2122. The first exhaust pipe 21223 is of a bent structure and extends in a direction away from the first liquid inlet 21222 to ensure the exhaust effect.

[0106] In some preferred embodiments, continuing to refer to Figures 5 - 6 , the dry powder mixing system 212 includes a second mixing mechanism spaced apart from the first mixing mechanism. The second mixing mechanism sequentially includes a second mixer 2123 and a second separator 2124 which are detachably arranged. The working principle of the second mixing mechanism is similar to that of the first mixing mechanism. Among them, the second mixer 2123 includes a second powder inlet 21231, a second liquid inlet 21232, and a second liquid outlet 21233. The second separator 2124 includes a second liquid inlet 21242, a second discharge port 21241, and a second exhaust pipe 21243. The second liquid outlet 21233 is in communication with the second liquid inlet 21242.

[0107] In some preferred embodiments, the inner diameter of the first powder inlet 21211 is smaller than that of the second powder inlet 21231, and the inner diameter of the first liquid inlet 21212 is smaller than that of the second liquid inlet 21232. Further, the second mixer 2123 has a second mixing position similar to the first mixing position 4113, and the inner diameter of the cavity at the first mixing position is smaller than the inner diameter of the cavity at the second mixing position.

[0108] In some embodiments, the feeding speed of the dry powder is 0.5 - 100 kg / min, and the liquid feeding speed of the solvent is 0.5 - 2.5 m 3 / min. The feeding speed is the speed at which the dry powder enters the first mixer or the powder inlet of the second mixer, and the liquid feeding speed is the speed at which the solution enters the first mixer or the liquid inlet of the second mixer.

[0109] By adopting the above technical solutions, by setting two sets of mixing mechanisms with different specifications, it is possible to adapt to the preparation of fracturing fluids in different scenarios and different requirements, improve the adaptability of the equipment, and when the two sets of mixing mechanisms are used simultaneously, it is also possible to improve the liquid preparation efficiency and effectively reduce the time cost of liquid preparation.

[0110] In some preferred embodiments, the first liquid supply pipeline 2113 is provided with an electric control valve and an electromagnetic flowmeter at intervals, for controlling and monitoring the liquid supply flow rate.

[0111] In some preferred embodiments, with continued reference to Figures 5 - 6 , the end of the second bending structure 21132 is connected to a diverter 2115, the diverter 2115 divides the upper water into at least two paths, and sends the liquid to the first liquid inlet 21212 and the second liquid inlet 21232 through the first lifting pipeline 2116 and the second lifting pipeline 2117 respectively. Among them, the inner diameters of the first lifting pipeline 2116 and the second lifting pipeline 2117 are different. In some embodiments, the diameter of the first lifting pipeline 2116 is DN100 (100 mm), and the diameter of the second lifting pipeline 2117 is DN80 (80 mm); further, electric control valves are respectively arranged at positions close to the lower end of the pipelines of the first lifting pipeline 2116 and the second lifting pipeline 2117, for controlling the operation or stop of the mixing mechanism.

[0112] In some preferred embodiments, with reference to Figures 7 - 10 , the equipment room 210 further includes a lifting mechanism 213 for adjusting the height of the mixing mechanism. The lifting mechanism 213 includes a driving device and a mounting frame 2131. The driving device includes a first lifting rod 2132 installed 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 includes a fixed rod 21321 and a telescopic rod 21322 that can be movably connected to the fixed rod 21321. Driven by the first power device, the telescopic rod 21322 can move relative to the fixed rod 21321 in its length direction and form at least a first position and a second position.

[0113] Furthermore, the first mixer 2121 and the second mixer 2123 are fixedly arranged at one end of the mounting frame 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 frame 2131 close to the fourth wall plate 216. Since the first mixer and the second mixer need to be connected to the dry powder delivery pipeline, and the dry powder delivery pipeline is arranged from bottom to top, adopting the solution in this embodiment, setting the mixer on the side close to the third wall plate and away from the second door body can reduce the situation where the staff is interfered by the dry powder delivery pipeline when entering the equipment room, and improve the safety of the equipment operation.

[0114] Understandably, the first power device can control the telescopic rod in a conventional manner in the art. In some embodiments, the fixed rod 21321 is sleeved outside the telescopic rod 21322. The first power device includes a rocker 21323 located at the bottom end of the first lifting rod 2132. The telescopic rod 21322 is controlled by rotating the rocker 21323, and the control method can be screw drive or hydraulic drive, etc. By adopting the above solution, setting the rocker at the bottom of the first lifting rod is convenient for the operation of the staff.

[0115] In some preferred embodiments, with continued reference to Figures 7 - 10 , the top end of the telescopic rod 21322 is fixedly connected to the mounting bracket 2131, and the lifting of the mounting bracket 2131 is achieved by the movement of the telescopic rod 21322. In some embodiments, the mounting bracket 2131 includes a first cross bar 21311. The two ends of the first cross bar 21311 are respectively connected to a first vertical rod 21312 and a second vertical rod 21313. The telescopic rod 21322 is fixedly connected to a first mounting position of the first cross bar 21311. The mounting bracket 2131 further includes a first diagonal rod 21314 and a second diagonal rod 21315. One end of the first diagonal 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 diagonal 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. By connecting the telescopic rod and the mounting bracket in the above manner, the mechanical strength of the mounting bracket during the lifting process can be ensured, and the safety of the equipment can be improved.

[0116] In some preferred embodiments, the driving device includes a second lifting rod 2134 installed on the fourth wall panel 216 and a second power device for driving the second lifting rod 2132. Similarly, the second lifting rod 2134 is similar to the first lifting rod 2132 and includes a fixed rod and a telescopic rod that can be movably connected to the fixed rod. Driven by the second power device, the telescopic rod can move relative to the fixed rod in its length direction and form at least two positions. The top end of the telescopic rod is fixedly connected to the mounting frame. By moving the telescopic rod, the lifting of the mounting frame is realized. The first lifting rod 2132, the second lifting rod 2132 and the mounting frame are fixed at corresponding positions. In some embodiments, the mounting frame 2131 includes a second cross bar 21316 symmetrically arranged with the first cross bar 21311. The two ends of the second cross bar 21316 are respectively connected to two parallel vertical rods. The second lifting rod 2132 is fixedly connected to the second mounting position of the second cross bar 21316. The mounting frame 2131 further includes a third diagonal rod and a fourth diagonal rod. One end of the third diagonal rod and the fourth diagonal rod are respectively connected to two parallel vertical rods, and the other ends are respectively fixed on both sides of the second mounting position to reinforce the second cross bar. Synchronously driving the first lifting rod 2132 and the second lifting rod 2134 can make the mounting frame realize the lifting function more smoothly.

[0117] In some preferred embodiments, referring to Figure 2 , the top end of the mounting frame 2131 has an adjustable baffle. The adjustable baffle includes 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 both the first cover body 501 and the third cover body 503 can rotate away from the equipment room relative to the second cover body 502. In some embodiments, the first cover body 501 and the third cover body 503 can rotate 180°, so that in a specific situation, the first cover body 501 or the third cover body 503 can be placed on the second cover body 502. 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 adopting the above technical solutions, on the one hand, it can cover the first mixing mechanism and the second mixing mechanism to prevent external rain or sand from entering the equipment room during work and ensure the safety of the equipment during work; on the other hand, when the first cover body 501 and the third cover body 503 are opened, it is convenient to repair or replace the mixing mechanism, improving work efficiency.

[0118] In some preferred embodiments, the top ends of the mounting brackets 2131 enclose to form a first cavity 2136. The first mixer 2121 and the second mixer 2123 are disposed through the first cavity 2136, and parts of the second pipe body 420 and the third pipe body 430 are located outside the first cavity 2136 to facilitate their connection to the dry powder delivery pipeline and the separator. By adopting the above technical solution, the operating 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.

[0119] In some preferred embodiments, referring to Figure 13 , one side of the mounting bracket 2131 close to the second lifting rod 2132 is provided with a horizontally arranged bearing shaft 2137. 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.

[0120] When the mixing mechanism is working, one end of the first separator 2122 is connected to the first mixer 2121. The first hanging ear 21224 abuts against the second cross bar 21316 at the first support position 2138 and receives the supporting force of the second cross bar 21316, so that the first separator 2122 can maintain a stable position under the action of the above two points; similarly, one end of the second separator 2124 is connected to the second mixer 2123. The second hanging ear 21244 abuts against the second cross bar 21316 and receives the supporting force of the second cross bar 21316, so that the second separator 2124 can maintain a stable position under the action of the above two points.

[0121] When the mixing mechanism is not working, the first separator 2122 is disconnected from the first mixer 2121. The first separator 2122 can rotate around the bearing shaft 2137 through the first hanging ear 21224 and become a vertical state for easy storage; similarly, the second separator 2124 is disconnected from the second mixer 2123. The second separator 2124 can rotate around the bearing shaft 2137 through the second hanging ear 21244 and become a vertical state. Since a better separation state needs to be achieved, the volume of the separator is usually large and it is difficult to directly store it in the equipment room. By adopting the above technical solution, when the mixing mechanism is not working, the connector between the separator and the mixer such as a union can be disassembled and the separator can be rotated so that it can be easily stored in the equipment room through the lifting mechanism, which is convenient for the transportation or storage of the equipment.

[0122] In some preferred embodiments, referring to Figure 9, at least one liquid addition pump 214 is further provided in the equipment chamber 210 for adding materials to the outside of the equipment chamber 210, such as the second mixed solution in the sand mixer. The liquid addition pump 214 is located near the fourth wall panel 216. A first baffle 810 is provided at a lower position of the fourth wall panel 216 away from the first wall panel 221. The first baffle 810 is hinged to the fourth wall panel 216 and includes an open state and a closed state. When it is in the open state, the liquid addition pump 214 inside the equipment chamber 210 can be connected to an external pipeline. In some embodiments, at least 4 liquid addition pumps 214 are spaced in the equipment chamber 210, namely a first liquid addition pump, a second liquid addition pump, a third liquid addition pump, and a fourth liquid addition pump, and each is provided with an inlet pipeline.

[0123] In some embodiments, the discharge pipelines of the first liquid addition pump and the second liquid addition pump are connected in parallel through an intermediate pipeline, and a gate is provided on the intermediate pipeline; a flow meter such as a mass flow meter is provided on the discharge pipeline of the first liquid addition pump. When the gate at the end of the discharge pipeline of the second liquid addition pump is closed and the gate of the intermediate pipeline is opened, the first liquid addition pump and the second liquid addition pump share the discharge pipeline of the first liquid addition pump so that they share the flow meter; when the gate at the end of the discharge pipeline of the second liquid addition pump is opened and the gate of the intermediate pipeline is closed, the second liquid addition pump is used independently. The discharge pipelines of the third liquid addition pump and the fourth liquid addition pump are independently arranged, and respective independent flow meters are configured on the discharge pipelines. The flow meters can be electromagnetic or turbine flow meters. By adopting the above technical solutions, the feeding rate of the liquid addition pump can be controlled more flexibly, and the preparation effect of the fracturing fluid can be ensured.

[0124] It can be understood that in some embodiments, the liquid addition pump can be a cam rotor pump with a displacement of 1-10 m 3 / h; further, the displacement of the first liquid addition pump and the second liquid addition pump is higher than that of the third liquid addition pump and the fourth liquid addition pump.

[0125] In some preferred embodiments, referring to Figure 8 , a first support frame 610 is provided above the liquid addition pump 214. An air compressor 710 and a dryer 720 are carried on the upper part of the first support frame 610. The air compressor 710 is connected to the dryer 720. The compressed gas enters the compressed air tank 730 located above the dryer 720 after being dried by the dryer 720. The compressed air tank 730 is fixed to the top of the equipment chamber 210. After the compressed gas enters the compressed air tank 730, it is discharged through an exhaust pipeline. An electric control valve is provided on the exhaust pipeline, and the exhaust pipeline is connected to the fluidized bed. By adopting the above technical solutions, the air compression system required by the fluidized bed is integrated in the equipment chamber, saving the occupied space of the equipment and improving the overall integration level of the equipment, which is convenient for the configuration and transportation of the equipment.

[0126] In summary, the dry powder continuous mixing equipment provided by the embodiments of the present invention divides the mixing equipment into relatively independent storage devices and mixing devices, and detachably sets mixers and separators in the dry powder mixing system and other technical means, solving the technical problems of unreasonable equipment layout and low solution preparation efficiency in the background technology, realizing more efficient equipment assembly and deployment, and better fracturing fluid mixing effect and other technical effects, and having good application prospects.

[0127] It should be noted that for those of ordinary skill in the art, the technical features in the above embodiments can be freely combined, and the formed technical solutions also belong to the embodiments disclosed in this application.

[0128] Furthermore, without departing from the principle of this application, several improvements and modifications can also be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A dry powder continuous mixing device, characterized in that: Comprising: A dry powder storage device, including a storage tank for storing dry powder. A fracturing fluid mixing device, including an equipment room, the equipment room includes a lifting and shunting system, the lifting and shunting system includes a first liquid inlet pipeline, a liquid inlet pump, and a first liquid supply pipeline that are connected in sequence. The liquid inlet pump pumps the liquid in the first liquid inlet pipeline through the first liquid supply pipeline to a dry powder mixing system at a higher position. The dry powder mixing system includes a first powder inlet, a first liquid inlet, and a first discharge port. The first liquid inlet is connected to the first liquid supply pipeline; the first powder inlet is connected to the storage tank through a dry powder conveying pipeline. Wherein, the dry powder mixing system includes a first mixer and a first separator that are detachably arranged in sequence. The first mixer forms a negative pressure inside for mixing dry powder and liquid to form a first mixed solution; the first separator is used for degassing and further mixing the first mixed solution to form a second mixed solution and discharging it from the first discharge port out of the equipment room.

2. The dry powder continuous mixing equipment according to claim 1, characterized in that: The dry powder storage device further includes a screw conveyor and a buffer bin. The screw conveyor conveys the dry powder in the storage tank to the buffer bin and enters the dry powder conveying pipeline from the first powder outlet of the buffer bin; a fluidized bed is arranged at the bottom of the storage tank for conveying the dry powder to the screw conveyor. The screw conveyor is horizontally arranged and includes a second powder inlet communicated with the fluidized bed and a second powder outlet communicated with the buffer bin.

3. The dry powder continuous mixing equipment according to claim 1 or 2, characterized in that: The fracturing fluid mixing device further includes an operation room adjacent to the equipment room; the operation room includes a first wall panel and a second wall panel arranged opposite to each other. The first wall panel is provided with a lockable first door body for isolating the internal environment of the operation room from the external environment; the equipment room includes a third wall panel and a fourth wall panel arranged opposite to each other. The fourth wall panel is provided with a lockable second door body for isolating the internal environment of the equipment room from the external environment. The first wall panel and the fourth wall panel are located on two opposite sides.

4. The dry powder continuous mixing equipment according to claim 3, characterized in that: The first liquid inlet pipeline is connected to the first side surface of the liquid inlet pump, and the second side surface of the liquid inlet pump is connected to the first liquid supply pipeline. The first side surface and the second side surface are adjacent; the first liquid supply pipeline includes a first bending structure and a second bending structure at both ends and a straight pipe body therebetween.

5. The dry powder continuous mixing equipment according to claim 3, characterized in that: The first mixer includes a first powder inlet, a first liquid inlet, and a first liquid outlet. The first separator includes a first liquid inlet, a first discharge port, and a first exhaust pipe. The first liquid outlet is connected to the first liquid inlet.

6. The dry powder continuous mixing equipment according to claim 5, wherein: The first mixer is composed of a first pipe body, a second pipe body, and a third pipe body. The first pipe body includes a bending part and an extending part. The bending part includes a first opening and a second opening at both ends. The extending part is communicated with the bending part and extends in a direction away from the second opening. The first opening forms the first liquid inlet. The second pipe body has a first pipe end and a second pipe end in its length direction. The first pipe end extends into the cavity of the bending part through the extending part to form a first mixing position; the first powder inlet is formed at the second pipe end; the third pipe body is communicated with the first opening and forms a first liquid outlet at one end.

7. The dry powder continuous mixing equipment according to claim 6, characterized in that: The dry powder mixing system includes a second mixing mechanism spaced apart from the first mixing mechanism. The second mixing mechanism sequentially includes a second mixer and a second separator which are detachably arranged. Among them, the second mixer includes a second powder inlet, a second liquid inlet, and a second liquid outlet. The second separator includes a second liquid inlet, a second discharge port, and a second exhaust pipe. The second liquid outlet is communicated with the second liquid inlet.

8. The dry powder continuous mixing equipment according to claim 7, wherein: The end of the second bending structure is connected to a diverter. The diverter divides the upper water into at least two paths, and sends the liquid to the first liquid inlet and the second liquid inlet respectively through a first lifting pipeline and a second lifting pipeline. Among them, the inner diameters of the first lifting pipeline and the second lifting pipeline are different.

9. The dry powder continuous mixing equipment according to claim 8, characterized in that: The equipment room further includes a lifting mechanism for adjusting the height of the mixing mechanism. The lifting mechanism includes a driving device and a mounting frame. The driving device includes a first lifting rod installed on the third wall panel and a first power device for driving the first lifting rod.

10. The dry powder continuous mixing equipment according to claim 9, characterized in that: The first lifting rod includes a fixed rod and a telescopic rod that can be movably connected to the fixed rod. Driven by the first power device, the telescopic rod can move relative to the fixed rod in its length direction and form at least a first position and a second position.

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