Integrated sand mixing equipment and sand mixing process for fracturing well completion operation

Abstract

The invention relates to the technical field of oil field fracturing operation, in particular to integrated sand mixing equipment and a sand mixing process. The integrated sand mixing equipment comprises a bearing platform; the fracturing fluid mixing system is arranged on the bearing platform; wherein the fracturing fluid mixing system comprises an integrated mixing device, the integrated mixing device comprises a first liquid inlet pipeline, a first feed port, a first mixer and a first discharge port, the first liquid inlet pipeline is communicated with the outside and used for providing a solvent, the first feed port is communicated with a storage device, and the solvent and materials are mixed in the first mixer; and a stirring tank for storing the liquid discharged from the first discharge port. According to the technical scheme, the fracturing fluid mixing system is integrally arranged on the bearing platform, so that the whole equipment is more integrated, the efficiency of equipment transportation and field arrangement is improved, and the timeliness of fracturing fluid preparation is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield fracturing operation, in particular to an integrated sand mixing device for fracturing completion operation and a sand mixing process. BACKGROUND

[0002] 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 through high pressure to form a fracture and carry proppant to fill it, so as to improve the oil and gas flow channel. It usually includes water-based fracturing fluid, oil-based fracturing fluid and other types.

[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, there are also devices for preparing fracturing fluid, but the device components are numerous, the field layout and device transportation are difficult, and the mixing efficiency of the fracturing fluid is affected.

[0004] Therefore, there is an urgent need in the art for a sand mixing device and process for fracturing fluid to solve the above technical problems.

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

[0006] The present application aims to provide an integrated sand mixing device and process for fracturing completion operation to solve at least one technical problem mentioned in the background.

[0007] Specifically, the first aspect of the present application provides an integrated sand mixing device for fracturing completion operation, comprising: a bearing platform, a fracturing fluid mixing system and a mixing tank located on the bearing platform; The fracturing fluid mixing system comprises: an integrated mixing device comprising a first liquid inlet pipeline in communication with the outside for providing a solvent, a first material inlet in communication with a material storage device, a first mixer and a first discharge outlet, the solvent and the material are mixed in the first mixer, and the mixed solution is discharged to the mixing tank through the first discharge outlet; an additive delivery pipeline for delivering additives to the mixing tank; a liquid supply delivery pipeline for delivering liquid supply to the mixing tank; a fracturing fluid output pipeline for outputting the mixed liquid in the mixing tank to a target area.

[0008] The above technical solution is adopted. The fracturing fluid mixing system is arranged on the bearing platform as a whole, which makes the device more integrated, improves the efficiency of device transportation and field layout, and makes the fracturing fluid preparation more timely.

[0009] Preferably, the carrying platform is a movable platform, and the fracturing fluid mixing system can realize the mixing function at different positions along with the movable platform.

[0010] Preferably, the fracturing fluid mixing system further comprises a storage device, which comprises a storage tank for storing materials.

[0011] Preferably, the carrying platform comprises an operation room at the first end for controlling the operation of the sand mixing device, and the storage device and the stirring tank are arranged in sequence in the direction away from the operation room.

[0012] Preferably, the storage device and the integrated mixing device are arranged at one end close to the operation room and are spaced apart, and the stirring tank is located in the direction away from the operation room, and the storage device and the integrated mixing device are spaced apart along the width direction of the carrying platform.

[0013] Preferably, the material conveying pipeline is detachable and comprises at least two sub-pipeline sections, and adjacent pipeline sections are detachably connected through a connecting mechanism; and a first carrier frame and a second carrier frame are respectively arranged on both sides close to the connecting mechanism.

[0014] Preferably, the first carrier frame comprises a support rod connected with the carrying platform and a plurality of spaced positioning rods, and a positioning groove is formed between adjacent positioning rods, wherein the positioning groove has at least three.

[0015] Preferably, the first carrier frame and the second carrier frame each comprise an end positioning groove at both ends and an internal positioning groove at the middle part, when the device is running, the two sub-pipeline sections are connected, and both of the two sub-pipeline sections are located in the internal positioning groove; and when the device stops running or is transported, the two sub-pipeline sections are separated and placed in the opposite end positioning grooves, so that the adjacent two sub-pipeline sections are arranged staggered.

[0016] Preferably, the storage device, the integrated mixing device, and the stirring tank part are each provided with a mounting mechanism matched with a cooperating mechanism located on the upper surface of the carrying platform.

[0017] Preferably, the integrated mixing device comprises a lifting and shunting system, which comprises a first liquid inlet pipeline, a liquid inlet pump, and a first liquid upward pipeline connected in sequence, and the liquid inlet pump pumps the liquid in the first liquid inlet pipeline to a powder-liquid mixing mechanism at a higher position through the first liquid upward pipeline.

[0018] Preferably, the powder-liquid mixing mechanism comprises a first feeding port, a first liquid inlet, and a first discharge port, the first liquid inlet is connected with the first liquid upward pipeline; and the first feeding port is connected with the storage tank through the material conveying pipeline.

[0019] Preferably, the powder-liquid mixing mechanism comprises a first mixer and a first separator arranged in sequence, the first mixer forms a negative pressure inside to mix the material 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 from the first discharge outlet to the stirring tank.

[0020] Preferably, the material storage device further comprises a screw conveyor and a buffer bin, the screw conveyor transports the material in the material storage tank to the buffer bin, and the material enters the material conveying pipeline from the first powder outlet of the buffer bin.

[0021] Preferably, the buffer bin has an internal cavity of a certain volume to avoid the discontinuity of material conveying caused by the rapid extraction of the material; further, the buffer bin also has a first air inlet arranged opposite to the first powder outlet to provide external atmospheric pressure for the material conveying pipeline.

[0022] Preferably, the material storage tank is provided with a fluidized bed at the bottom to transport the material to the screw conveyor, the screw conveyor is arranged transversely and comprises a second feeding port in communication with the fluidized bed and a second powder outlet in communication with the buffer bin.

[0023] Preferably, the fracturing fluid mixing system further comprises: An air compression device comprising a second air inlet, a first air outlet and an air compressor, external air enters the air compressor through the first air inlet, and after compression, is introduced into the material storage device through the first air outlet to transport the material.

[0024] Preferably, the first mixer comprises a first feeding port, a first liquid inlet and a first liquid outlet, the first separator comprises a first liquid inlet, a first discharge outlet and a first exhaust pipe, and the first liquid outlet is in communication with the first liquid inlet.

[0025] Preferably, the first mixer is composed of a first pipe body, a second pipe body and a third pipe body, the first pipe body comprises a bending portion and an extension portion, the bending portion comprises a first opening and a second opening at both ends, the extension portion is in communication with the bending portion and extends away from the second opening, and the first opening forms a first liquid inlet; the second pipe body has a first pipe end and a second pipe end in the length direction, the first pipe end extends into the cavity of the bending portion to form a first mixing position, the second pipe end forms a first feeding port, and the third pipe body is in communication with the first opening and forms a 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 guide vane; the first liquid inlet and the first discharge outlet are eccentrically arranged.

[0027] Preferably, the first separator upper part is provided with a first exhaust pipe near the first liquid inlet, the first exhaust pipe is a bending structure and extends away from the first liquid inlet.

[0028] Preferably, the fracturing fluid mixing system further comprises: A liquid addition pump system for conveying external fluid to the mixing tank through the additive delivery pipeline, the liquid addition pump system comprising a first liquid addition pump, a second liquid addition pump, a third liquid addition pump and a fourth liquid addition pump; wherein the discharge pipelines of the first liquid addition pump and the second liquid addition pump are connected in parallel through an intermediate pipeline, and the intermediate pipeline is provided with a valve; the discharge pipelines of the third liquid addition pump and the fourth liquid addition pump are independently provided.

[0029] Preferably, the integrated mixing device, the additive delivery pipeline, the liquid supply delivery pipeline and the fracturing fluid output pipeline are independently controlled.

[0030] Preferably, the integrated sand mixing device only needs to provide an external water source and an external fluid when arranged in a new working position.

[0031] In a second aspect of the present application, a sand mixing process is provided, which is performed by the sand mixing device of the first aspect of the present application and comprises the following steps: The step of controlling the mixer to generate negative pressure: the solvent is pumped into the first liquid inlet of the first mixer by the liquid inlet pump integrated in the carrying platform, and negative pressure is formed at the first liquid inlet of the first mixer, the negative pressure being the first pressure.

[0032] Dry air from outside is introduced into the storage tank by the air compression device on the carrying platform to fluidize the material.

[0033] The first mixing step: under the action of the first pressure, the material flows from the storage tank to the first mixer through the material delivery pipeline from the first liquid inlet, and is mixed with the solvent at the first mixing position in the first mixer to form a first mixed solution. The first mixer has a first liquid inlet connected to the storage tank through a material delivery pipeline.

[0034] The second mixing step: the first mixed solution is discharged from the first liquid outlet of the first mixer, enters the first separator through the first liquid inlet, and is mixed and further degassed to form a second mixed solution, and the first separator is provided with eccentric helical blades. The sand mixing step: the solution in the mixing tank is stirred and mixed.

[0035] In summary, the present application has the following beneficial effects: The integrated sand mixing device provided by the present application has the following beneficial effects: The integrated sand mixing device provided by the present application has the following beneficial effects: Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of an integrated sand mixing device according to the first embodiment of this application; Figure 2 This is a schematic diagram of an integrated sand mixing device according to the second embodiment of this application; Figure 3 This is a top view of the integrated sand mixing device according to the third embodiment of this application; Figure 4 for Figure 1 Enlarged view of area A; Figure 5 This is a schematic diagram of the first support frame in some embodiments of this application; Figure 6 This is a schematic diagram of the booster diversion system and powder-liquid mixing mechanism in some embodiments of this application; Figure 7 This is a schematic diagram of a storage device in some embodiments of this application; Figure 8 This is a cross-sectional view of the mixer in some embodiments of this application; Figure 9 This is a schematic diagram of the top of the powder-liquid mixing mechanism in some embodiments of this application; Figure 10 A schematic diagram of a liquid filling pump in some embodiments of this application; Figure 11 This is a schematic diagram of an air compression system in some embodiments of this application.

[0038] The technical solution of this application can be more clearly understood and explained through the above description of the reference numerals in the accompanying drawings and in conjunction with the embodiments of this application.

[0039] 100. Storage device; 110. Storage tank; 120. Screw conveyor; 130. Buffer silo; 131. First powder outlet; 132. First air inlet; 140. Fluidized bed; 141. Connecting mechanism; 150. Material conveying pipeline; 160. Mixed liquid conveying pipeline; 161. First support frame; 1611. Support rod; 1612. Positioning rod; 1613. Positioning groove; 162. Second support frame; 200. Integrated mixing and blending device; 211, lifting diversion system; 2111, first liquid inlet pipeline; 2112, liquid inlet pump; 2113, first liquid outlet pipeline; 21132, elbow pipe section; 2115, diverter; 2116, first lifting pipeline; 2117, second lifting pipeline; 212, powder-liquid mixing mechanism; 2121, first mixer; 21211, first material inlet; 21212, first liquid inlet; 21213, first liquid outlet; 2122, first separator; 21221, first discharge port; 21222, first liquid inlet; 21223, first exhaust pipe; 2123, second mixer; 21231, second material inlet; 21232, second liquid inlet; 2124, second separator; 214, liquid-adding pump; 300, sand delivery device; 410, first pipe body; 411, elbow portion; 4111, first opening; 4112, second opening; 4113, first mixing position; 412, extension portion; 420, second pipe body; 421, first pipe end; 422, second pipe end; 430, third pipe body; 501, first cover body; 502, second cover body; 503, third cover body; 610, first support frame; 710, air compressor; 720, dryer; 730, compressed air tank; 800, stirring tank; 900, carrying platform; 901, operation chamber; DETAILED DESCRIPTION

[0040] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to various alternative embodiments as well. It is to be understood that the description of any exemplary embodiment is intended only to be used to interpret and understand the scope of the application. Therefore, the exemplary embodiments are not intended to be exhaustive or to be limited to the precise form disclosed. Many modifications and variations are possible in light of this disclosure. It is intended that the scope of the application be defined by the claims and their equivalents.

[0041] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the embodiments and the appended claims, the singular forms "a", "an" and "the" are intended to include 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.

[0042] The present application will be described in detail through embodiments.

[0043] 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 a formation under high pressure to form a fracture and carry proppant to fill the fracture to improve the flow path of oil and gas. It usually includes water-based fracturing fluid and oil-based fracturing fluid. The water-based fracturing fluid is usually prepared by mixing materials such as polyacrylamide with water to obtain a solution with a specific concentration or viscosity. In the prior art, equipment for preparing fracturing fluid has gradually appeared. However, the equipment has many components, and it is difficult to arrange and transport the equipment on site, which affects the mixing efficiency of the fracturing fluid.

[0044] To solve the technical problems of the existing dredging equipment in the background art, the present application provides an integrated sand mixing device for fracturing and completion operations, which includes a carrying platform, a fracturing fluid mixing system and a mixing tank located on the carrying platform. The fracturing fluid mixing system includes an integrated mixing device, an additive delivery pipeline, a liquid supply delivery pipeline and a fracturing fluid output pipeline. The integrated mixing device includes a first liquid inlet pipe connected to the outside for providing a solvent, a first feed inlet connected to a storage device, a first mixer and a first discharge outlet. The solvent and the material are mixed in the first mixer, and the mixed solution is discharged to the mixing tank through the first discharge outlet. The additive delivery pipeline is used to deliver additives to the mixing tank. The liquid supply delivery pipeline is used to deliver liquid to the mixing tank. The fracturing fluid output pipeline is used to output the mixed liquid in the mixing tank to a target area.

[0045] According to the present application, the fracturing fluid mixing system is arranged on the carrying platform as a whole, which makes the equipment more integrated, improves the efficiency of equipment transportation and on-site arrangement, and makes the preparation of fracturing fluid more timely.

[0046] 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.

[0047] Based on the present application, in some preferred embodiments of the present application, an integrated sand mixing device for fracturing and completion operations is provided for preparing oilfield fracturing fluid, which is usually a solution with a certain viscosity formed by mixing dry powder and pure water. In some embodiments, the dry powder can be polyacrylamide. It can be understood that the oilfield fracturing fluid can also be formed by mixing other materials with pure water, which is not limited in the present application.

[0048] In some preferred embodiments, the oilfield fracturing fluid further includes additives selected from at least one of a crosslinking agent, a pH regulator and a surfactant. Further, the additives can also include proppants such as sand.

[0049] Specifically, in some embodiments, the integrated sand mixing device, as shown in Figures 1-2 includes: The carrying platform 900 is a movable platform with a storage platform that can accept control instructions to move, in specific implementation processes. In some embodiments, it can be a sand mixing vehicle operated by a worker on site or remotely, or a movable robot moved by a carrier according to autonomous operation, etc.

[0050] The fracturing fluid mixing system, wherein the fracturing fluid mixing system comprises: a storage device 100 comprising a storage tank 110 for storing materials; an integrated mixing device 200 comprising a first liquid inlet pipeline in communication with the outside for providing a solvent, a first material inlet in communication with the storage device, a first mixer, and a first discharge outlet, wherein the solvent and the materials are mixed in the first mixer. In specific implementation processes, the fracturing fluid mixing system is arranged on the storage platform of the carrying platform 900 to facilitate the overall transportation of the equipment.

[0051] In some preferred embodiments, the fracturing fluid mixing system is arranged on a movable platform and can realize the mixing function at different positions with the movable platform.

[0052] The stirring tank 800 is used to store the liquid discharged from the first discharge outlet. In specific implementation processes, the stirring tank 800 is also arranged on the storage platform of the carrying platform 900 and receives the liquid discharged from the fracturing fluid mixing system for storing and outputting the fracturing fluid.

[0053] The additive delivery pipeline is used to deliver additives to the stirring tank 800. It can be understood that the additive delivery pipeline is in communication with an external additive container.

[0054] The liquid supply delivery pipeline is used to deliver liquid supply to the stirring tank 800. In some embodiments, the liquid supply is water used to dilute the liquid in the stirring tank 800 in some cases. It can be understood that the liquid supply delivery pipeline is in communication with an external liquid supply container.

[0055] The fracturing fluid output pipeline is used to output the mixed liquid in the stirring tank 800 to a target area.

[0056] By arranging the fracturing fluid mixing system on the carrying platform, the equipment is more integrated, the efficiency of equipment transportation and on-site arrangement is improved, and the timeliness of fracturing fluid preparation is stronger.

[0057] In some preferred embodiments, the carrying platform 900 comprises an operation room 901 at the first end, and the storage device 100 and the stirring tank 800 are arranged in sequence in a direction away from the operation room 901. Since the stirring tank 800 gradually increases in weight during the working process, the above technical solution can facilitate the on-site application of the fracturing fluid, and can also ensure that the storage device 100 and the stirring tank 800, which are relatively heavy, are arranged at the two ends of the platform, so that the center of gravity of the equipment is more stable.

[0058] Further, as shown in Figure 3 , the storage device 100 and the integrated mixing device 200 are arranged at one end close to the operation room 901 and are spaced apart, and the stirring tank 800 is located in a direction away from the operation room 901. In some embodiments, the storage device 100 and the integrated mixing device 200 are spaced apart along the width direction of the platform. The above technical solution can better balance the center of gravity of the equipment and ensure the stability of the equipment during use.

[0059] As shown in Figures 4-5 , the storage tank 110 is connected to the integrated mixing device 200 through the material conveying pipeline 150. Since the length of the pipeline therebetween is relatively long, it is inevitable to encounter bumps during transportation. Therefore, in some embodiments of the present application, the material conveying pipeline 150 is detachable, that is, the material conveying pipeline 150 is divided into at least two sub-pipeline sections, and adjacent pipeline sections are detachably connected through a connecting mechanism 141. First and second bearing frames 161 and 162 are arranged on both sides close to the connecting mechanism 141 to ensure the stability of the pipeline during transportation. In some embodiments, the connecting mechanism can be a nut.

[0060] Further, in some preferred embodiments, the first bearing frame 161 comprises a support rod 1611 connected to the platform and a plurality of spaced apart positioning rods 1612, and a positioning groove 1613 is formed between adjacent positioning rods 1612, wherein the positioning groove 1613 has at least three. It can be understood that in some embodiments, the second bearing frame 162 has the same structure as the first bearing frame 161.

[0061] In some preferred embodiments, the first bearing frame 161 and the second bearing frame 162 each comprise an end positioning groove at both ends and an internal positioning groove at the middle. When the equipment is running, the two sub-pipeline sections are connected, and both of them are located in the internal positioning groove. When the equipment stops running or is transported, the two sub-pipeline sections are separated and placed in the opposite end positioning grooves, so that the two adjacent sub-pipeline sections are arranged staggered, so that the two sub-pipeline sections avoid mutual friction during transportation, and the wear of the equipment during transportation is reduced.

[0062] In some preferred embodiments, the storage device 100, the integrated mixing device 200 and the stirring tank 800 are each provided with a mounting mechanism which cooperates with a cooperating mechanism on the upper surface of the loading platform to position the storage device 100, the integrated mixing device 200 and the stirring tank 800 on the loading platform 900, thereby ensuring the stability of the above-mentioned equipment. In some embodiments, the mounting mechanism and the cooperating mechanism can be a bolt-nut cooperation, a protrusion-groove cooperation, a sliding block-rail cooperation or the like.

[0063] In some preferred embodiments, referring to Figure 6 , the fracturing fluid mixing device 200 comprises a lifting and shunting system 211 which comprises a first liquid inlet pipeline 2111, a liquid inlet pump 2112 and a first liquid outlet pipeline 2113 which are sequentially connected. The liquid inlet pump 2112 pumps the liquid in the first liquid inlet pipeline 2111 to the powder-liquid mixing mechanism 212 at a higher position through the first liquid outlet pipeline 2113. The powder-liquid mixing mechanism 212 comprises a first material 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 material inlet 21211 is connected with the storage tank 110 through the material conveying pipeline 150.

[0064] In some preferred embodiments, the loading platform has a first surface at its upper end. The first liquid inlet pipeline 2111 is below the first surface. One end of the first liquid outlet pipeline 2113 close to the liquid inlet pump 2112 is below the first surface, and the other end thereof passes through the first surface to connect with the powder-liquid mixing mechanism 212. By embedding the pipeline of the lifting and shunting system 211 in the loading platform, the pipeline is more stable, and the surface of the loading platform is more simple, thereby ensuring the safety of the equipment during operation.

[0065] In the specific implementation process, the powder-liquid mixing mechanism 212 is farther away from the bottom of the loading platform than the liquid inlet pump 2112, i.e. at a higher position. Such arrangement is beneficial to fully utilize the space on the loading platform 900, reduce the floor space, and facilitate the pipeline layout.

[0066] In some preferred embodiments, continuing to refer to Figure 6The powder-liquid mixing mechanism 212 includes a first mixing mechanism, which in turn includes a first mixer 2121 and a first separator 2122 arranged in sequence. The first mixer 2121 is arranged to form a negative pressure inside to mix the material and liquid to form a first mixed solution. The first separator 2122 is arranged to degas and further mix the first mixed solution to form a second mixed solution, which is discharged from a first discharge port 21221 to the mixing tank 800. In some embodiments, the second mixed solution is delivered to the mixing tank 800 through the mixing liquid delivery pipeline 160 for final preparation and use of the fracturing fluid. In some preferred embodiments, the first mixer 2121 and the first separator 2122 are connected by a hinge.

[0067] With the above technical solution, by detachably arranging the mixer and the separator in the powder-liquid mixing mechanism, the maintenance and transportation of the equipment can be facilitated while ensuring the mixing effect of the fracturing fluid, and the connection between the first mixer and the first separator can be more stable and less likely to break during transportation.

[0068] In some preferred embodiments, referring to Figure 7 The storage device 100 further includes a screw conveyor 120 and a buffer bin 130. The screw conveyor 120 delivers the material in the storage tank 110 to the buffer bin 130, and the material enters the material delivery pipeline 150 from a first powder outlet 131 of the buffer bin 130.

[0069] In the specific implementation process, the buffer bin 130 has an internal cavity of a certain volume to avoid the discontinuity of material delivery caused by the rapid extraction of the material. Further, the buffer bin 130 also has a first air inlet 132, which can be arranged opposite to the first powder outlet 131 to provide external atmospheric pressure for the material delivery pipeline 150 to prevent the formation of negative pressure in the material delivery pipeline 150 and affect the delivery of the material.

[0070] In some preferred embodiments, continuing to refer to Figure 7 The storage tank 110 is approximately funnel-shaped, and a fluidized bed is arranged at the bottom to deliver the material to the screw conveyor 120 and improve the delivery efficiency of the material. In this embodiment, the screw conveyor 120 is arranged transversely and includes a feed inlet in communication with the fluidized bed and a powder outlet in communication with the buffer bin 130 to reduce the influence of gravity during the material delivery process and improve the stability of the material delivery.

[0071] In some preferred embodiments, the continuous sand mixing device further comprises a fixed frame, the bottom of which is connected to the storage platform, and functions to position the fixed frame. Further, a first fixed plate is arranged on the top of the fixed frame 300, and the storage device 100 is connected to the first fixed plate only through the top of the storage tank 110. Since the air pressure is large during the material conveying process, the pipeline may inevitably shake, and the above arrangement can ensure that the storage device 100 is stably fixed, has a certain deformable space at the lower part, reduces the metal fatigue of the bottom structure of the storage device 100 during the material conveying process, and improves the service life of the device.

[0072] In some preferred embodiments, as shown in Figure 6 , the first mixer 2121 comprises a first feeding port 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 to the first liquid inlet 21222.

[0073] Specifically, in some embodiments, referring to Figure 8 , 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 comprises a bending part 411 and an extension part 412. The bending part 411 comprises a first opening 4111 and a second opening 4112 at both ends. The extension part 412 is connected to the bending part 411 and extends away from the second opening 4112. The first liquid inlet 21212 is formed at the first opening 4111. The second pipe body 420 has a first pipe end 421 and a second pipe end 422 in the length direction. The first pipe end 421 extends into the cavity of the bending part 411 via the extension part 412, forming a first mixing position 4113. The liquid transported by the first liquid pipe 2113 and the material transported by the material conveying pipeline 150 are fully mixed in this position. The second pipe end 422 forms the first feeding port 21211. The third pipe body 430 is connected to the second opening 4112 and forms the first liquid outlet 21213 at one end.

[0074] In some preferred embodiments, the first liquid pipe 2113 is provided with an electric control valve and an electromagnetic flowmeter at intervals, for controlling and monitoring the liquid flow.

[0075] 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.

[0076] 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.

[0077] In some preferred embodiments, continuing to refer to Figure 6 , the powder-liquid mixing mechanism 212 includes a second mixing mechanism arranged apart from the first mixing mechanism. The second mixing mechanism includes 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 inner diameter of the first feed inlet 21211 is smaller than that of the second feed 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.

[0078] 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.

[0079] In some preferred embodiments, continuing to refer to Figure 6 , the end of the bent pipe section 21132 is connected to a flow divider 2115. The flow divider 2115 divides the 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 pipe 2116 and the second lifting pipe 2117, respectively. The inner 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 (100 mm), and the diameter of the second lifting pipe 2117 is DN80 (80 mm). Further, the first lifting pipe 2116 and the second lifting pipe 2117 are respectively provided with electric control valves near the lower ends of the pipes for controlling the operation or stop of the mixing mechanism.

[0080] In some preferred embodiments, referring toFigure 9 The top end of the integrated mixing device 200 has an adjustable baffle, which includes a first cover 501, a second cover 502, and a third cover 503 arranged in sequence. The first cover 501 and the third cover 503 are respectively hinged to the second cover 502, so that the first cover 501 and the third cover 503 can rotate away from the placement platform relative to the second cover 502. In some embodiments, the first cover 501 and the third cover 503 can rotate by 180°, so that the first cover 501 or the third cover 503 can be placed on the second cover 502 in certain cases. The first cover 501 corresponds to the positions of the first mixer 2121 and the second mixer 2123, and the third cover 503 corresponds to the positions of the first separator 2122 and the second separator 2124. With 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 from entering the equipment during work, thereby ensuring the safety of the equipment during work. On the other hand, when the first cover 501 and the third cover 503 are opened, the mixing mechanism can be conveniently repaired or replaced, thereby improving work efficiency.

[0081] In some preferred embodiments, with reference to Figure 10 The integrated mixing device 200 further includes at least one liquid adding pump 214 for conveying external liquid to the mixing tank 800 through the additive delivery pipeline. In some embodiments, at least four liquid adding pumps 214 are arranged at intervals, which are respectively a first liquid adding pump, a second liquid adding pump, a third liquid adding pump, and a fourth liquid adding pump, and each is provided with an inlet pipeline.

[0082] In some embodiments, the discharge pipelines of the first liquid adding pump and the second liquid adding pump are connected in parallel through an intermediate pipeline, and the intermediate pipeline is provided with a valve. A flow meter such as a mass flow meter is arranged on the discharge pipeline of the first liquid adding pump. When the valve at the end of the discharge pipeline of the second liquid adding pump is closed and the valve of the intermediate pipeline is opened, the first liquid adding pump and the second liquid adding pump share the discharge pipeline of the first liquid adding pump, so that they share the flow meter. When the valve at the end of the discharge pipeline of the second liquid adding pump is opened and the valve of the intermediate pipeline is closed, the second liquid adding pump is independently used. The discharge pipelines of the third liquid adding pump and the fourth liquid adding pump are independently arranged, and each is provided with a respective independent flow meter. The flow meter can be an electromagnetic or turbine flow meter. With the above technical solution, the feeding rate of the liquid adding pump can be more flexibly controlled, thereby ensuring the preparation effect of the fracturing fluid.

[0083] Understandably, in some embodiments, the liquid adding pump can be a cam rotor pump with a displacement of 1-10 m³ / h. Further, the displacement of the first liquid adding pump and the second liquid adding pump is higher than that of the third liquid adding pump and the fourth liquid adding pump.

[0084] In some preferred embodiments, with reference toFigure 11 The upper portion of the liquid additive pump 214 is provided with a first support frame 610, and an air compression device is arranged on the upper portion of the first support frame 610. The air compression device includes an air compressor 710 and a dryer 720. The air compressor 710 is connected with the dryer 720. The compressed gas is dried by the dryer 720 and then enters a compressed air tank 730 arranged on the upper portion of the dryer 720. The external air enters the compressed air tank 730 through a second air inlet of the air compressor 710, is compressed, and is discharged through a first air outlet connected with the fluidized bed. By using the technical scheme, the air compression system required by the fluidized bed is integrally arranged, the land occupation of the equipment is saved, and the integration level of the whole equipment is improved, so that the configuration and transportation of the equipment are facilitated.

[0085] In some preferred embodiments, the integrated mixing device 200 further comprises a sand delivery device 300. In some embodiments, the sand delivery device 300 delivers the external proppant to the mixing tank 800 through the additive delivery pipeline.

[0086] In some preferred embodiments, the integrated sand mixing device only needs to externally provide a water source and an external liquid when arranged at a new working position, that is, when the carrying platform is moved to the working position, the water source and the external liquid are only needed to be introduced into the corresponding position of the sand mixing device, so that the fracturing fluid can be configured, and the equipment does not need to be assembled and disassembled on site, so that more efficient on-site arrangement is achieved.

[0087] In some embodiments of the present application, a sand mixing process is also provided, which is completed by the sand mixing device in the above embodiments. Specifically, the process comprises the following steps: S100, a step of controlling the mixer to generate negative pressure: The solvent is pumped into the first liquid inlet of the first mixer by the liquid inlet pump integrated in the sand mixing vehicle, and negative pressure is formed at the first liquid inlet of the first mixer. The negative pressure is the first pressure.

[0088] In specific embodiments, the solvent can be pure water. The flow rate of the solvent is controlled by the liquid inlet pump, so that the negative pressure is generated in the cavity of the first mixer after the solvent enters the first mixer.

[0089] S200, dry air outside is introduced into the storage tank by the air compression device arranged on the sand mixing vehicle, so that the material is fluidized.

[0090] In the specific implementation process, the fluidization of the material is realized by the fluidized bed arranged at the bottom of the storage tank, so as to prevent the material from being blocked in the storage tank during the conveying process. It can be understood that the steps S100 and S200 are not limited to the order of the above two steps, and the order of the above two steps can be adjusted by the person skilled in the art according to the actual needs.

[0091] S300, first mixing step: Under the action of the first pressure, the material from the storage tank enters the first mixer through the material conveying pipeline from the first feeding port and is mixed with the solvent at the first mixing position in the first mixer to form a first mixed solution. The first mixer has a first feeding port connected to the storage tank through the material conveying pipeline. Because the solvent enters the cavity at a high speed, a negative pressure is generated to enable the material to pass through the material conveying pipeline.

[0092] Further, the material conveying pipeline forms a buffer bin having an internal cavity of a certain volume to avoid discontinuous material conveying caused by rapid extraction of the material, and the first air inlet is located on the buffer bin.

[0093] S400, second mixing step: The first mixed solution is discharged from the first outlet of the first mixer, enters the first separator through the first liquid inlet, and is mixed and further degassed to form a second mixed solution, and the first separator is provided with an eccentric spiral blade.

[0094] In a specific embodiment, the first mixed solution is degassed and further mixed in the first separator to generate a second mixed solution which is then discharged into the stirring tank.

[0095] S400, sand mixing step: The solution in the stirring tank is stirred and mixed. In some embodiments, the stirring tank is in a continuous working state, which can mix the newly prepared second mixed solution with additives, liquid supply, or can mix the remaining second mixed solution with additives, liquid supply when the fracturing fluid mixing system is not working, or can mix additives, liquid supply, etc. when the fracturing fluid mixing system is not working.

[0096] By using the above technical solution, the negative pressure is formed in the first mixer to drive the material from the storage tank to mix with the solvent in the first mixer, realize continuous liquid preparation for oil field fracturing fluid, and significantly improve the liquid preparation efficiency and quality.

[0097] In summary, the integrated sand mixing device provided by the embodiments of the application solves the technical problems of difficult field arrangement and equipment transportation of the fracturing fluid sand mixing device in the background art by integrally arranging the fracturing fluid mixing system on the carrying platform, realizes the integration of the device as a whole, improves the equipment transportation and field arrangement efficiency, and has good application prospect.

[0098] It should be noted that the technical features in the above embodiments can be freely combined by those skilled in the art, and the formed technical solutions also belong to the embodiments disclosed in the present application.

[0099] Further, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims, the application can be practiced otherwise than as specifically written herein.

Claims

1. An integrated sand mixing device for fracturing completion operations, characterized in that, The integrated fracturing fluid mixing device comprises a first liquid inlet pipe for providing solvent, a first material inlet pipe connected with a material storage device, a first mixer, and a first outlet pipe. The integrated fracturing fluid mixing device comprises a first liquid inlet pipe for providing solvent, a first material inlet pipe connected with a material storage device, a first mixer, and a first outlet pipe. The integrated fracturing fluid mixing device comprises a first liquid inlet pipe for providing solvent, a first material inlet pipe connected with a material storage device, a first mixer, and a first outlet pipe. The integrated fracturing fluid mixing device comprises a first liquid inlet pipe for providing solvent, a first material inlet pipe connected with a material storage device, a first mixer, and a first outlet pipe. The integrated fracturing fluid mixing device comprises a first liquid inlet pipe for providing solvent, a first material inlet pipe connected with a material storage device, a first mixer, and a first outlet pipe.

2. The integrated fracturing fluid mixing device according to claim 1, wherein the supporting platform is a movable platform, and the fracturing fluid mixing system can realize mixing function at different positions with the movable platform.

3. The integrated fracturing fluid mixing device according to claim 1, wherein the supporting platform comprises an operation room at a first end for controlling the operation of the integrated fracturing fluid mixing device, and the material storage device and the mixing tank are arranged in sequence in a direction away from the operation room.

4. The integrated fracturing fluid mixing device according to claim 3, wherein the material storage device and the integrated fracturing fluid mixing device are arranged at one end close to the operation room and are spaced apart, and the mixing tank is arranged in a direction away from the operation room, and the material storage device and the integrated fracturing fluid mixing device are spaced apart along the width direction of the supporting platform.

5. The integrated fracturing fluid mixing device according to claim 1, wherein the material conveying pipe is detachable and comprises at least two sub-pipe sections, and adjacent pipe sections are detachably connected through a connecting mechanism, and a first supporting frame and a second supporting frame are arranged at both sides close to the connecting mechanism.

6. The integrated fracturing fluid mixing device according to claim 1, wherein the integrated fracturing fluid mixing device comprises a lifting and shunting system, and the lifting and shunting system comprises a first liquid inlet pipe, a liquid inlet pump, and a first liquid inlet pipe connected in sequence, and the liquid inlet pump pumps the liquid in the first liquid inlet pipe to a powder-liquid mixing mechanism at a higher position through the first liquid inlet pipe.

7. The integrated fracturing fluid mixing device according to claim 7, wherein the powder-liquid mixing mechanism comprises a first material inlet pipe, a first liquid inlet pipe, and a first outlet pipe, the first liquid inlet pipe is connected with the first liquid inlet pipe, and the first material inlet pipe is connected with the material storage tank through the material conveying pipe.

8. The integrated fracturing fluid mixing device according to claim 1, wherein the fracturing fluid mixing system comprises a liquid adding pump system for conveying external liquid to the mixing tank through the additive conveying pipe, and the liquid adding pump system comprises a first liquid adding pump, a second liquid adding pump, a third liquid adding pump, and a fourth liquid adding pump, wherein the discharge pipelines of the first liquid adding pump and the second liquid adding pump are connected in parallel through an intermediate pipeline, the intermediate pipeline is provided with a valve, and the discharge pipelines of the third liquid adding pump and the fourth liquid adding pump are independently arranged. ​ ​ ​ ​ ​ ​ ​ ​ ​ 9. The integrated sand mixing device for fracturing completion operation according to any one of claims 1-8, characterized in that: the integrated mixing device, additive delivery pipeline, liquid supply delivery pipeline and fracturing fluid output pipeline are independently controlled.

10. A sand mixing process performed by the sand mixing device according to any one of claims 1-9, and comprising the steps of: a step of controlling the mixer to generate negative pressure: pumping the solvent into the first inlet of the first mixer through the liquid inlet pump integrated on the carrying platform, and forming negative pressure at the first inlet of the first mixer, the negative pressure being the first pressure; a step of fluidizing the material by passing external dry air into the storage tank through the air compression device on the carrying platform; a first mixing step: under the action of the first pressure, the material flows from the storage tank into the first mixer through the material delivery pipeline from the first inlet, and is mixed with the solvent at the first mixing position in the first mixer to form a first mixed solution. The first mixer has a first inlet connected to the storage tank through the material delivery pipeline; a second mixing step: the first mixed solution is discharged from the first outlet of the first mixer, enters the first separator through the first inlet, and is mixed and further degassed to form a second mixed solution, and the first separator is provided with eccentric helical blades; a sand mixing step: the solution in the stirring tank is stirred and mixed.

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