Dry powder conveying device and dry powder continuous mixing equipment

Abstract

The utility model relates to the technical field of oil field fracturing operation, in particular to a dry powder conveying device and continuous dry powder mixing equipment. The dry powder conveying device comprises a dry powder storage device which comprises a storage tank used for storing dry powder, a spiral conveyor and a material buffering bin, and the spiral conveyor conveys the dry powder in the storage tank to the material buffering bin; the dry powder conveying pipeline is used for conveying the dry powder from the slow storage bin to the fracturing fluid mixing device; wherein the material buffering bin is provided with an inner cavity with a certain volume, the cavity comprises a first powder outlet, and the first powder outlet is communicated with the dry powder conveying pipeline. By the adoption of the technical scheme, by arranging the material buffering bin with a certain volume, discontinuous dry powder conveying caused by the fact that the dry powder conveying speed is too high due to the high negative pressure state in the dry powder conveying pipeline can be avoided, and therefore the stability and consistency of mixing of the dry powder and a solvent are guaranteed, and the dry powder mixing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield fracturing operation, in particular to a dry powder conveying device 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 water-based fracturing fluid is usually prepared by mixing dry powder such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity. In the prior art, devices for preparing fracturing fluid have gradually appeared, but the efficiency is low in the process of storing and conveying dry powder.

[0004] Therefore, there is an urgent need in the art for a dry powder conveying device to solve the above technical problems.

[0005] In view of this, the present application is proposed. SUMMARY

[0006] The present application aims to provide a dry powder conveying device 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 dry powder conveying device, comprising:

[0008] a dry powder storage device, comprising a storage tank for storing dry powder, a screw conveyor and a buffer bin, the screw conveyor conveying the dry powder in the storage tank to the buffer bin;

[0009] a dry powder conveying pipeline for conveying the dry powder from the buffer bin to a fracturing fluid mixing device;

[0010] wherein the buffer bin has an internal cavity with a certain volume, and the cavity comprises a first powder outlet, the first powder outlet being in communication with the dry powder conveying pipeline.

[0011] By adopting the above technical solution, by providing a buffer bin with a certain volume, the discontinuity of dry powder conveying caused by the high negative pressure state of the dry powder conveying pipeline and the too fast conveying speed of the dry powder can be avoided, so as to ensure the stability and consistency of the mixing of dry powder and solvent, and improve the dry powder mixing efficiency.

[0012] Preferably, the buffer bin further has a first air inlet arranged at the opposite side of the first powder outlet, for providing external atmospheric pressure for the dry powder conveying pipeline.

[0013] Preferably, the screw conveyor is connected with a first longitudinal surface of the buffer bin, and the first powder outlet is located on a second longitudinal surface of the buffer bin, the first longitudinal surface and the second longitudinal surface being adjacent.

[0014] Preferably, the storage tank is provided with a fluidized bed at the bottom, for delivering the dry powder to the screw conveyor, the screw conveyor being transversely arranged and comprising a second powder inlet communicating with the fluidized bed and a second powder outlet communicating with the buffer bin.

[0015] Preferably, the dry powder continuous mixing device further comprises a fixed frame, and the storage tank is fixed to the top end of the fixed frame only by the mounting rod at the upper portion; and / or, the fixed frame is provided with a first bearing plate at the top, the first bearing plate at least partially covering the storage tank.

[0016] In a second aspect of the present application, a dry powder continuous mixing device is provided, comprising:

[0017] The dry powder conveying device as described in the first aspect of the present application,

[0018] The fracturing fluid mixing device comprises a device chamber, and the device chamber comprises a lifting and shunting system, the lifting and shunting system comprising a first liquid inlet pipeline, a liquid inlet pump and a first liquid outlet pipeline in sequence, the liquid inlet pump pumping the liquid in the first liquid inlet pipeline to a dry powder mixing system at a higher position through the first liquid outlet pipeline, the dry powder mixing system comprising a first powder inlet, a first liquid inlet and a first outlet, the first liquid inlet communicating with the first liquid outlet pipeline; the first powder inlet communicates with a storage tank through a dry powder conveying pipeline.

[0019] The dry powder mixing system comprises a first mixer and a first separator arranged in sequence and detachably, the first mixer being internally formed with a negative pressure for mixing the dry powder and the 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 the second mixed solution is discharged from the device chamber through the first outlet.

[0020] Preferably, the fracturing fluid mixing device further comprises an operation chamber arranged adjacent to the device chamber. The operation chamber comprises first and second wall plates arranged oppositely, the first wall plate being provided with a lockable first door body for isolating the internal and external environments of the operation chamber; the device chamber comprises third and fourth wall plates arranged oppositely, the fourth wall plate being provided with a lockable second door body for isolating the internal and external environments of the device chamber, the first wall plate and the fourth wall plate being located on two opposite sides.

[0021] Preferably, the third wallboard is provided with a first support plate, which is hinged with the third wallboard 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 is in the substantially perpendicular angle relationship with the third wallboard.

[0022] Preferably, a distribution box, an operation cabinet, a temperature adjusting device, and a flow meter are arranged in the operation room; a first partition plate is arranged between the operation room and the equipment room, and an observation window is arranged on the first partition plate; the operation cabinet is arranged close to the first partition plate and includes a display operation panel arranged from top to bottom, an operation platform close to horizontal, and a cabinet body; the flow meter is arranged on the first partition plate and is slightly higher than the top end of the operation cabinet.

[0023] Preferably, the first liquid inlet pipeline is connected with the first side of the liquid inlet pump, the second side of the liquid inlet pump is connected with the first liquid outlet pipeline, the first side is adjacent to the second side; the first liquid outlet pipeline includes first and second bending structures at two ends and a straight pipeline body between the two bending structures.

[0024] Preferably, the first mixer includes a first powder inlet, a first liquid inlet, and a first liquid outlet, and the first separator includes a first liquid inlet and a first discharge outlet, the first liquid outlet is in communication with the first liquid inlet.

[0025] Preferably, the first mixer is composed of a first pipeline body, a second pipeline body, and a third pipeline body, the first pipeline body includes a bending part and an extension part, the bending part includes first and second openings at two ends, the extension part is in communication with the bending part and extends away from the second opening, the first opening forms the first liquid inlet; the second pipeline body has a first pipeline end and a second pipeline end in the length direction, the first pipeline end extends into the cavity of the bending part to form a first mixing position, the second pipeline end forms the first powder inlet; the third pipeline body is in communication with the first opening and forms the first liquid outlet at one end.

[0026] 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 discharge outlet are eccentrically arranged.

[0027] Preferably, a first exhaust pipe is arranged on the first separator at a position close to the first liquid inlet, the first exhaust pipe is a bending structure and extends away from the first liquid inlet.

[0028] Preferably, the dry powder mixing system comprises a second mixing mechanism arranged apart from the first mixing mechanism, the second mixing mechanism comprising a second mixer and a second separator arranged in sequence, detachably; wherein the second mixer comprises a second powder inlet, a second liquid inlet, and a second liquid outlet, and 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.

[0029] Preferably, the first powder inlet has a smaller inner diameter than the second powder inlet, and the first liquid inlet has a smaller inner diameter than the second liquid inlet.

[0030] Preferably, the second bending structure is connected to a flow divider at the end thereof, 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 a first lifting pipe and a second lifting pipe, respectively, wherein the first lifting pipe and the second lifting pipe have different diameters.

[0031] Preferably, the equipment room further comprises a lifting mechanism for adjusting the height of the mixing mechanism, the lifting mechanism comprising a driving device and a mounting frame, and 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.

[0032] Preferably, the first lifting rod comprises a fixed rod and a telescopic rod capable of being movably connected to the fixed rod, and under the driving of the first power device, the telescopic rod is capable of moving in the length direction of the fixed rod and forms at least a first position and a second position.

[0033] 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.

[0034] Preferably, the mounting frame comprises a first horizontal rod, the two ends of the first horizontal rod are connected to 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, and 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.

[0035] 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 vertical rods are arranged in parallel at two ends of the second horizontal rod, 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 each of the third inclined rod and the fourth inclined rod is connected to the two vertical rods arranged in parallel, and the other end of each of the third inclined rod and the fourth inclined rod is fixed to the two sides of the second mounting position.

[0036] Preferably, the top end of the mounting frame is provided with an adjustable baffle, and 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 away from the equipment chamber relative to the second cover body.

[0037] Preferably, the top end of the mounting frame is provided with a first cavity, and 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.

[0038] Preferably, the side of the mounting frame close to the second lifting rod is provided with a horizontally arranged bearing shaft, and 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.

[0039] Preferably, at least one liquid adding pump is further arranged in the equipment chamber, the liquid adding pump is located close to the fourth wall plate, and a first baffle is arranged on the lower part of the fourth wall plate away from the first wall plate, the first baffle is hingedly connected to the fourth wall plate, and the first baffle comprises an open state and a closed state, when the first baffle is in the open state, the liquid adding pump in the equipment chamber can access the external pipeline.

[0040] Preferably, a first supporting frame is arranged on the upper part of the liquid adding pump, and an air compressor and a dryer are arranged on the upper part of the first supporting frame, the air compressor is connected to the dryer, compressed gas enters a compressed air tank located on the upper part of the dryer after being dried by the dryer, the compressed air tank is fixed to the top of the equipment chamber, and the compressed gas is discharged through an exhaust pipeline after entering the compressed air tank, and the exhaust pipeline is connected to the fluidized bed.

[0041] In summary, the application has the following beneficial effects:

[0042] Firstly, the dry powder conveying device provided by the application can avoid the discontinuous dry powder conveying caused by the high negative pressure state of the dry powder conveying pipeline and the excessively fast dry powder conveying speed, so as to ensure the stability and consistency of the dry powder and solvent mixing, and improve the dry powder mixing efficiency.

[0043] Secondly, the dry powder conveying device provided by the application can reduce the influence of the shaking of the dry powder conveying pipeline under negative pressure on the mechanical performance of the buffer bin, thereby improving the stability of the product.

[0044] 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 arranging two groups of mixing mechanisms of 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

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0046] Figure 1 is a sectional view of the dry powder conveying device in some embodiments of the application;

[0047] Figure 2 is a schematic view of the dry powder continuous mixing device at a first angle in some embodiments of the application;

[0048] Figure 3 is a schematic view of the dry powder continuous mixing device at a second angle in some embodiments of the application;

[0049] Figure 4 is a side view of the dry powder continuous mixing device in some embodiments of the application;

[0050] Figure 5 is a schematic view of the dry powder storage device in some embodiments of the application;

[0051] Figure 6 is a schematic view 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 application;

[0052] Figure 7 is a schematic view 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 application;

[0053] Figure 8 is a first side view of the fracturing fluid mixing device in some embodiments of the application;

[0054] Figure 9 is a first side view of the fracturing fluid mixing device in some embodiments of the application; Figure 8Cross-sectional view of the A-A angle;

[0055] Figure 10 Second side view of the fracturing fluid mixing device in some embodiments of the present application;

[0056] Figure 11 For Figure 10 Cross-sectional view of the C-C angle;

[0057] Figure 12 For the internal schematic diagram of the operating chamber in some embodiments of the present application;

[0058] Figure 13 Front view of the fracturing fluid mixing device in some embodiments of the present application;

[0059] Figure 14 For the schematic diagram of the support mode of the separator in some embodiments of the present application;

[0060] Figure 15 For the cross-sectional view of the mixer in some embodiments of the present application.

[0061] Explanation of reference signs

[0062] Through the above explanation of reference signs, combined with the embodiments of the present application, the technical solutions of the present application can be more clearly understood and explained.

[0063] 100, dry powder storage device; 110, storage tank; 120, screw conveyor; 130, buffer bin; 131, first powder outlet; 132, first air inlet; 140, fluidized bed;

[0064] 200, fracturing fluid mixing device;

[0065] 210, equipment chamber;

[0066] 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 pipe body; 2114, water inlet; 2115, distributor; 2116, first lifting pipeline; 2117, second lifting pipeline;

[0067] 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;

[0068] 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;

[0069] 214, liquid addition pump;

[0070] 215, third wall plate; 2151, first support plate; 216, fourth wall plate; 2161, second door body;

[0071] 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;

[0072] 300, fixing frame; 310, first bearing plate;

[0073] 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;

[0074] 501, first cover body; 502, second cover body; 503, third cover body;

[0075] 610, first support frame;

[0076] 710, air compressor; 720, dryer; 730, compressed air tank;

[0077] 810, first baffle plate;

[0078] 900, dry powder conveying pipeline; 910, mixed liquid conveying pipeline. DETAILED DESCRIPTION

[0079] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following exemplary embodiments are not intended to represent all implementations in accordance with the present disclosure. Rather, they are merely examples in accordance with some aspects of the present disclosure as detailed in the appended claims.

[0080] The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used in the present disclosure 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.

[0081] The present disclosure will be described in detail herein with reference to the attached drawings and specific embodiments.

[0082] 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 at 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, etc. The water-based fracturing fluid is usually artificially prepared by mixing dry powder such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity. In the prior art, devices for preparing fracturing fluid have gradually appeared, but the efficiency is low during the storage and conveying of dry powder.

[0083] To solve the technical problems existing in the prior art in the background art, the inventive concept of the present disclosure provides a dry powder conveying device, which comprises: a dry powder storage device comprising a storage tank for storing dry powder, a screw conveyor, and a buffer bin, wherein the screw conveyor conveys the dry powder in the storage tank to the buffer bin; a dry powder conveying pipeline for conveying the dry powder from the buffer bin to a fracturing fluid mixing device; wherein the buffer bin has an internal cavity with a certain volume, and the cavity comprises a first powder outlet, which is in communication with the dry powder conveying pipeline.

[0084] According to the inventive concept, by providing a buffer bin with a certain volume, the discontinuity of dry powder conveying caused by the high negative pressure state of the dry powder conveying pipeline and the excessively fast conveying speed of the dry powder can be avoided, thereby ensuring the stability and consistency of the mixing of dry powder and solvent and improving the dry powder mixing efficiency.

[0085] 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 of the present disclosure.

[0086] Based on the inventive concept of the present application, in some preferred embodiments of the present application, a dry powder delivery device is provided for preparing an oilfield fracturing fluid, which is usually a solution with a certain viscosity formed by mixing dry powder with pure water; in some embodiments, the dry powder can be polyacrylamide.

[0087] In some preferred embodiments, the oilfield fracturing fluid further comprises an additive selected from at least one of a crosslinking agent, a pH regulator, and a surfactant.

[0088] Specifically, in some embodiments of the present application, a dry powder delivery device is provided, as shown in Figures 1-5 comprises:

[0089] The dry powder storage device 100 comprises a storage tank 110 for storing dry powder, a screw conveyor 120, and a buffer bin 130, wherein the screw conveyor 120 delivers the dry powder in the storage tank 110 to the buffer bin 130.

[0090] A dry powder delivery pipeline 900 is provided for delivering the dry powder from the buffer bin 130 to a fracturing fluid mixing device.

[0091] The buffer bin 130 has an internal cavity with a certain volume, and the cavity comprises a first powder outlet 131, which is in communication with the dry powder delivery pipeline 900.

[0092] With the above technical solution, by providing a buffer bin with a certain volume, the discontinuity of dry powder delivery caused by the high negative pressure state of the dry powder delivery pipeline and the excessively fast delivery speed of the dry powder can be avoided, thereby ensuring the stability and consistency of the mixing of dry powder and solvent and improving the dry powder mixing efficiency.

[0093] In some preferred embodiments, the buffer bin 130 further has a first air inlet, which can be arranged opposite to the first powder outlet 131, to provide external atmospheric pressure for the dry powder delivery pipeline and prevent the dry powder delivery pipeline from being unable to deliver smoothly due to loss of pressure inside the pipeline.

[0094] In some preferred embodiments, the screw conveyor 120 is connected to a first longitudinal surface of the buffer bin 130, and the first powder outlet is located on a second longitudinal surface of the buffer bin, wherein the first longitudinal surface and the second longitudinal surface are adjacent. By arranging the first powder outlet on the side adjacent to the screw conveyor, direct air suction from the screw conveyor can be avoided, and powder feeding can be more uniform.

[0095] In some preferred embodiments, with reference to Figures 1-5, the storage tank 110 is approximately funnel-shaped, and a fluidized bed is arranged at the bottom of the storage tank 110 for delivering the dry powder to the screw conveyor 120 and improving the delivery 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, so as to reduce the influence of gravity on the dry powder delivery and improve the stability of the dry powder delivery.

[0096] In some preferred embodiments, referring to Figures 1-3 , the dry powder continuous mixing device further includes a fixing frame 300, and the storage tank 110 is fixed to the top end of the fixing frame 300 only through the mounting rod at the upper portion. With the above scheme, the accessories at the lower portion of the storage tank are reduced, and the installation and maintenance of the delivery structure at the bottom of the storage tank can be facilitated. Further, the fixing frame is provided with a first bearing plate 310 at the top, and the first bearing plate 310 at least partially covers the storage tank, so as to facilitate the operation of the staff at the top of the storage tank. Since the air pressure is large during the delivery of the dry powder, the pipeline may inevitably shake. The above arrangement can ensure that the dry powder storage device 100 is stably fixed, has a certain deformable space at the lower portion, reduces the metal fatigue of the bottom structure of the dry powder storage device 100 during the delivery of the dry powder, and improves the service life of the device.

[0097] In some other embodiments of the present application, a dry powder continuous mixing device is provided, as shown in Figures 2-4 , which includes:

[0098] The dry powder delivery device as described in the above embodiments;

[0099] The fracturing fluid mixing device 200 is used for mixing the dry powder and water to form the oilfield fracturing fluid with required physical properties.

[0100] In the specific implementation process, the fracturing fluid mixing device 200 and the dry powder storage device 100 are arranged independently of each other, that is, the positions of the two devices can be adjusted by the user according to the actual needs.

[0101] In some preferred embodiments, referring to Figures 6-7The 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 outlet 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 outlet pipeline 2113, the dry powder mixing system 212 comprises a first powder inlet 21211, a first liquid inlet 21212 and a first outlet 21221, the first liquid inlet 21212 is connected with the first liquid outlet pipeline 2113; the first powder inlet 21211 is connected with the storage tank 110 through a dry powder conveying pipeline 900.

[0102] 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.

[0103] In some preferred embodiments, with continuous reference to Figures 6-7 The dry powder mixing system 212 comprises a first mixing mechanism comprising a first mixer 2121 and a first separator 2122 arranged 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; 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.

[0104] By dividing the mixing device into relatively independent storage devices and mixing devices, the above technical solution is more convenient for assembly and deployment of the device. Further, by detachably arranging the mixer and the separator in the dry powder mixing system, the fracturing fluid mixing effect can be ensured, and the device is more convenient for maintenance and transportation.

[0105] In some preferred embodiments, the fracturing fluid mixing device 200 further comprises an operation chamber 220 arranged adjacent to the device chamber 210. With continuous reference to Figures 8-13The 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.

[0106] In some preferred embodiments, referring to Figure 13 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.

[0107] In some preferred embodiments, referring to Figures 8-13 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.

[0108] 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.

[0109] 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 a first bending structure 21131 and a second bending structure 21132 located at two ends and having the same bending direction, and a straight pipeline body 21133 located between the first bending structure 21131 and the second bending structure 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.

[0110] 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.

[0111] In some preferred embodiments, as shown in Figures 6-7 , the first mixer 2121 comprises a first powder inlet 21211, a first liquid inlet 21212 and a first liquid outlet 21213, the first separator 2122 comprises a first liquid inlet 21222 and a first discharge port 21221, and the first liquid outlet 21213 is connected in communication with the first liquid inlet 21222.

[0112] Specifically, in some embodiments, referring to Figure 15 , the first mixer 2121 is composed of a first pipeline body 410, a second pipeline body 420 and a third pipeline body 430, the first pipeline body 410 comprises a bending portion 411 and an extension portion 412, the bending portion 411 comprises a first opening 4111 and a second opening 4112 located at two ends, the extension portion 412 is connected in communication with the bending portion 411 and extends away from the second opening 4112, and the first liquid inlet 21212 is formed at the first opening 4111. The second pipeline 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 bending portion 411 via the extension portion 412 to form a first mixing position 4113, the liquid transported by the first liquid outlet pipeline 2113 and the dry powder transported by the dry powder transport pipeline 900 are fully mixed at the first mixing position 4113, and the second pipe end 422 forms the first powder inlet 21211. The third pipeline body 430 is connected in communication with the second opening 4112 and forms the first liquid outlet 21213 at one end.

[0113] In some embodiments, the first liquid outlet 21213 is in communication with the first liquid inlet 21222 of the first separator 2122, and the two are preferably connected by a pipe. The first separator 2122 is internally provided with a spiral guide vane for degassing and further mixing of the first mixed solution. In some preferred embodiments, the first liquid inlet 21222 and the first discharge outlet 21221 are eccentrically arranged to improve the degassing effect of the first mixed solution.

[0114] Further, the first separator 2122 is provided with a first exhaust pipe 21223 near the first liquid inlet 21222. The first exhaust pipe 21223 is a bent structure and extends away from the first liquid inlet 21222 to ensure the exhaust effect.

[0115] In some preferred embodiments, continuing to refer to Figures 6-7 , the dry powder mixing system 212 comprises a second mixing mechanism arranged apart from the first mixing mechanism. The second mixing mechanism comprises a second mixer 2123 and a second separator 2124 arranged in sequence. 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 discharge outlet 21241, and a second exhaust pipe 21243. The second liquid outlet 21233 is in communication with the second liquid inlet 21242.

[0116] 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. The inner diameter of the cavity at the first mixing position is smaller than that at the second mixing position.

[0117] By adopting the above technical solution, two groups of mixing mechanisms with different specifications are arranged to adapt to different scenes and different needs of fracturing fluid configuration, thereby improving the adaptability of the equipment. 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.

[0118] In some preferred embodiments, the first liquid inlet pipe 2113 is provided with an electric control valve and an electromagnetic flowmeter arranged at intervals for controlling and monitoring the liquid inlet flow.

[0119] In some preferred embodiments, continuing to refer to Figures 6-7The second bending structure 21132 is connected to a flow divider 2115 at the end, the flow divider 2115 divides the water 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, 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 respectively 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.

[0120] In some embodiments, the feeding speed of the dry powder is 0.5-100kg / min, and the liquid feeding speed of the solvent is 0.5-2.5m 3 / min; the feeding speed is the speed of the dry powder entering the powder inlet of the first mixer or the second mixer, and the liquid feeding speed is the speed of the solution entering the liquid inlet of the first mixer or the second mixer.

[0121] In some preferred embodiments, with reference to Figures 8-11 The equipment room 210 further comprises a lifting mechanism 213 for adjusting the height of the mixing mechanism, the lifting mechanism 213 comprises a driving device, 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 capable of being movably connected with 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 telescopic rod 21322 and form at least a first position and a second position.

[0122] Further, 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 are to be connected with the dry powder conveying pipe, and the dry powder conveying pipe is arranged from bottom to top, by adopting the scheme in the embodiment, the mixers are arranged on the side close to the third wall plate, away from the second door body, which can reduce the interference of the dry powder conveying pipe on the workers entering the equipment room, and improve the safety of the operation of the equipment.

[0123] It can be understood that the first power device can control the telescopic rod in a manner common in the art. In some embodiments, the fixed rod 21321 is arranged outside the telescopic rod 21322, the first power device comprises a rocker 21323 at the bottom end of the first lifting rod 2132, and the telescopic rod 21322 is controlled by rotating the rocker 21323, which can be a screw transmission or a hydraulic transmission. With the above scheme, the rocker is arranged at the bottom of the first lifting rod, which can facilitate the operation of the staff.

[0124] In some preferred embodiments, with continued reference to Figures 8-11 , the top end of the telescopic rod 21322 is fixedly connected with the mounting frame 2131, and the mounting frame 2131 is lifted by moving the telescopic rod 21322. In some embodiments, the mounting frame 2131 comprises 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 frame 2131 further comprises 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 frame are connected in the above manner, which can ensure the mechanical strength of the mounting frame during lifting and improve the safety of the equipment.

[0125] 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.

[0126] In some preferred embodiments, with reference to Figure 3 , 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 chamber, 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 chamber 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.

[0127] 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.

[0128] In some preferred embodiments, referring to Figure 14 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.

[0129] 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.

[0130] 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.

[0131] In some preferred embodiments, referring to Figure 10The 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.

[0132] 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.

[0133] 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.

[0134] In some preferred embodiments, referring to Figure 9 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.

[0135] In summary, the dry powder conveying device provided by the embodiment of the present application can avoid the discontinuous dry powder conveying caused by the high negative pressure state in the dry powder conveying pipeline and the excessively fast dry powder conveying speed, solve the technical problem of low dry powder conveying efficiency in the prior art, ensure the stability and consistency of the dry powder and solvent mixing, improve the dry powder mixing efficiency, and have a good application prospect.

[0136] It should be noted that the technical features in the above embodiments can be freely combined for those skilled in the art, and the formed technical solutions also belong to the embodiments disclosed in the present application.

[0137] 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 dry powder delivery device, characterized by: The dry powder conveying device comprises: a dry powder storage device comprising a storage tank for storing dry powder, a screw conveyor, and a buffer bin, wherein the screw conveyor is used to convey the dry powder in the storage tank to the buffer bin; a dry powder conveying pipeline used to convey the dry powder from the buffer bin to the fracturing fluid mixing device; wherein the buffer bin has an internal cavity, and the cavity comprises a first powder outlet, which is in communication with the dry powder conveying pipeline.

2. The dry powder conveying device according to claim 1, wherein: the buffer bin further comprises a first air inlet arranged on the opposite side of the first powder outlet, so as to provide external atmospheric pressure for the dry powder conveying pipeline.

3. The dry powder conveying device according to claim 1, wherein: the screw conveyor is connected to a first longitudinal surface of the buffer bin, and the first powder outlet is arranged on a second longitudinal surface of the buffer bin, and the first longitudinal surface and the second longitudinal surface are adjacent.

4. The dry powder conveying device according to claim 3, wherein: the storage tank is provided with a fluidized bed at the bottom, which is used to convey the dry powder to the screw conveyor, and the screw conveyor is arranged transversely and comprises a second powder inlet in communication with the fluidized bed and a second powder outlet in communication with the buffer bin.

5. The dry powder conveying device according to any one of claims 1-4, wherein: the dry powder continuous mixing device further comprises a fixed frame, and the storage tank is fixed to the top end of the fixed frame only through the mounting rod at the upper portion; and / or the fixed frame is provided with a first bearing plate at the top, and the first bearing plate at least partially covers the storage tank.

6. A continuous dry powder compounding apparatus, characterized by: The dry powder conveying device according to any one of claims 1-5, a fracturing fluid mixing device comprising a device chamber, wherein 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 outlet pipeline arranged in sequence, the liquid inlet pump is used to pump the liquid in the first liquid inlet pipeline to a dry powder mixing system at a higher position through the first liquid outlet pipeline, the dry powder mixing system comprises a first powder inlet, a first liquid inlet, and a first discharge outlet, and the first liquid inlet is in communication with the first liquid outlet pipeline; the first powder inlet is in communication with the storage tank through the dry powder conveying pipeline; wherein the dry powder mixing system comprises a first mixer and a first separator arranged in sequence and detachable, the first mixer is internally formed with a negative pressure, which is used to mix the dry powder and the 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 the second mixed solution is discharged from the liquid outlet of the first discharge outlet to the outside of the device chamber.

7. The dry powder continuous mixing device according to claim 6, wherein: the fracturing fluid mixing device further comprises an operation chamber arranged adjacent to the device chamber; the operation chamber comprises a first wall plate and a second wall plate arranged oppositely, the first wall plate is provided with a lockable first door body, which is used to isolate the internal environment of the operation chamber from the external environment; the device chamber comprises a third wall plate and a fourth wall plate arranged oppositely, the fourth wall plate is provided with a lockable second door body, which is used to isolate the internal environment of the device chamber from the external environment, and the first wall plate and the fourth wall plate are located on two opposite sides. ​ 8. The dry powder continuous compounding apparatus of claim 6, wherein: a first liquid inlet pipe is connected to a first side of a liquid inlet pump, a second side of the liquid inlet pump is connected to a first liquid inlet pipe, the first side and the second side are adjacent to each other; the first liquid inlet pipe comprises a first bending structure, a second bending structure at both ends, and a straight pipe body between the first bending structure and the second bending structure.

9. The dry powder continuous compounding apparatus of claim 8, wherein: an end of the second bending structure is connected to a flow divider, the flow divider divides the liquid into at least two paths, and the liquid is sent to the first liquid inlet and the second liquid inlet through a first lifting pipe and a second lifting pipe, respectively, wherein the first lifting pipe and the second lifting pipe have different diameters.

10. The dry powder continuous compounding apparatus of claim 6, wherein: at least one liquid addition pump is further arranged in the apparatus chamber, the liquid addition pump is located close to a fourth wall plate, the fourth wall plate is provided with a first baffle at a position away from the lower part of the first wall plate, the first baffle is hinged to the fourth wall plate, and comprises an open state and a closed state, when the first baffle is in the open state, the liquid addition pump inside the apparatus chamber can access the external pipeline.

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