CN114589087B

CN114589087B - Filtering mechanism and sand mixing equipment

Info

Publication number: CN114589087B
Application number: CN202210170924.0A
Authority: CN
Inventors: 姜一博; 孙建韬; 马骁
Original assignee: Yantai Jereh Oilfield Services Group Co Ltd
Current assignee: Yantai Jereh Oilfield Services Group Co Ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2023-04-18
Anticipated expiration: 2042-02-22
Also published as: CN114589087A

Abstract

The invention discloses a filtering mechanism and sand mulling equipment, which are used for solving the problem that fracturing pumping equipment is prone to failure due to the fact that impurities with large sizes exist in gravel in the prior art. This filtering mechanism includes: the shell is provided with a first feeding hole and a first discharging hole; the filtering screen is positioned in the shell and is cylindrical, an opening at one end of the filtering screen faces the first feeding hole, and the side wall of the filtering screen faces the first discharging hole; at least one support assembly positioned between the housing and the filter screen; and the first driving assembly is arranged on the shell or the fixed object, is in transmission connection with the filtering screen and is used for driving the filtering screen to rotate relative to the shell. According to the filtering mechanism provided by the invention, in the rotating process of the filtering screen, gravel meeting the use requirement flows out of the filtering holes of the filtering screen, and finally flows out of the filtering mechanism from the first discharge hole for standby use, so that large-size impurities can be separated, and the large-size impurities are prevented from entering fracturing pumping equipment to cause faults.

Description

Filtering mechanism and sand mixing equipment

Technical Field

The invention relates to the technical field of oil and gas field exploitation equipment, in particular to a filtering mechanism and sand mixing equipment.

Background

In the field of oil and gas exploitation, the fracturing technology is a method for forming cracks on oil and gas layers by using high-pressure sand-containing liquid so as to improve the flowing environment of oil and gas underground. Because the fracturing sand and the fracturing fluid in the sand-containing liquid need to be mixed in proportion, the fracturing fluid and the fracturing sand need to be fully mixed by using a sand mixing device, a chemical additive is added according to the requirement, the mixed sand-containing turbid liquid is pumped to a fracturing pump, and the mixed sand-containing turbid liquid is pumped into an oil-gas well by the fracturing pump at high pressure.

In actual operation, various impurities with larger sizes, such as stones, glass, nuts, gaskets and the like, can fall into the fracturing sand in the production, conveying and storage processes, and if the impurities are not removed before sand mixing, the impurities can enter a fracturing pump along with a liquid supply pipeline. Because the fracturing pump is high-pressure and high-precision equipment, a high-pressure valve and a low-pressure valve at a hydraulic end need to be frequently opened and closed during working, if impurities with larger sizes in fracturing sand are clamped between a valve body and a sealing surface in the valve closing process, damage or even direct crushing of the valve seal can be left on the valve seal under the high-pressure action of the hydraulic end, so that the hydraulic end seal is rapidly failed, and great hidden danger is caused to well site safety management.

Disclosure of Invention

The invention aims to provide a filtering mechanism and sand mulling equipment, which are used for solving the problem that fracturing pumping equipment is prone to failure due to the fact that impurities with larger sizes exist in gravel in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

in one aspect, some embodiments of the present invention provide a filter mechanism including a housing, a filter screen, at least one support assembly, and a first drive assembly. The shell is provided with a first feeding hole and a first discharging hole. The filter screen is located the shell, and the filter screen is the tube-shape, and the one end opening of filter screen is towards first feed inlet, and the lateral wall of filter screen is towards first discharge gate. At least one support assembly is positioned between the housing and the filter screen, the support assembly for supporting the filter screen. The first driving assembly is arranged on the shell or a fixed object, is in transmission connection with the filtering screen and is used for driving the filtering screen to rotate relative to the shell.

In some embodiments, the support assembly includes a mount, a support shaft, and an idler tube. The support shaft is connected with the fixing piece. The support shaft is sleeved with the support roller pipe body, and the support roller pipe body is configured to rotate relative to the support shaft. Wherein, one of shell and filter screen cloth is connected with the mounting, and the other rolls with the lateral wall of bearing roller body and contacts.

In some embodiments, the first drive assembly includes a motor and a drive shaft. The motor is mounted on the housing. The transmission shaft runs through the shell and is connected with the shell rotation, and the one end that the transmission shaft is located the shell is connected with the tip of filter screen, and the other end that the transmission shaft is located the shell outside is connected with motor transmission.

In some embodiments, the housing includes a first housing portion and a second housing portion. The first shell part is the tube-shape, and the one end opening of first shell part is first feed inlet, has first opening on the lateral wall of first shell part. The second shell part is provided with a second opening, the second opening is connected with the first opening, the second shell part surrounds a first containing cavity, and a first discharging hole is formed in the position, opposite to the second opening, of the second shell part.

In some embodiments, the axis of the first housing portion is parallel to the axis of the filter screen, and the distance between the inner wall of the first housing portion and the outer wall of the filter screen decreases from one edge of the first opening to the other edge of the first opening in the direction of rotation of the filter screen.

In some embodiments, the filter mechanism further comprises: the discharging blades are spirally arranged on the inner side wall of the filtering screen along the axis direction of the filtering screen.

In some embodiments, the filter mechanism further comprises a bracket and a second drive assembly. The bracket comprises a bracket main body part and a fixed seat, the bracket main body part is connected with the shell, and the bracket main body part is hinged with the fixed seat; the fixing seat is used for fixing the filtering mechanism on a fixed object. One end of the second driving component is hinged with the shell, and the other end of the second driving component is hinged with the fixed object; the second driving assembly is used for driving the shell to rotate relative to the fixed seat.

In another aspect, some embodiments of the present invention provide a sand mulling apparatus including the filtering mechanism, the sand conveying mechanism and the sand mulling tank of any of the above embodiments. The sand conveying mechanism is used for receiving the gravel from the first discharge hole of the filtering mechanism and conveying the gravel to the sand mixing tank. The sand mixing tank is used for mixing gravel and fracturing fluid.

In some embodiments, the sand mixing equipment further comprises a storage mechanism, a material guide mechanism and a fracturing fluid conveying pipeline. The material storage mechanism comprises a second feeding hole and a second discharging hole; the storing mechanism is used for receiving and storing gravel from the sand conveying mechanism. The material guide mechanism comprises a shell and a control part arranged on the shell; a third feed inlet and a third discharge outlet are respectively arranged at two ends of the shell, and the third feed inlet is communicated with the second discharge outlet; the control part is used for controlling the flow of the gravel flowing out of the third discharge hole. The fracturing fluid conveying pipeline comprises a first pipe section, a second pipe section and a third pipe section which are sequentially connected along the extending direction of the pipeline, wherein the diameter of the second pipe section is smaller than that of the first pipe section and that of the third pipe section; the joint of the second pipe section and the third pipe section is provided with a fourth feed inlet communicated with the inner cavity of the second pipe section, and the fourth feed inlet is communicated with the third discharge outlet.

In some embodiments, the sand mixing equipment further comprises a storage mechanism, a material guide mechanism and a fracturing fluid conveying pipeline. The material storage mechanism comprises a second feeding hole and a second discharging hole; the storing mechanism is used for receiving and storing the gravel from the sand conveying mechanism. The material guide mechanism comprises a shell and a control part arranged on the shell; a third feed inlet and a third discharge outlet are respectively arranged at two ends of the shell, and the third feed inlet is communicated with the second discharge outlet; the control part is used for controlling the flow of the gravel flowing out of the third discharge hole. The fracturing fluid conveying pipeline comprises a first pipe section, a second pipe section and a third pipe section which extend in the same direction, the first pipe section is connected with the third pipe section, one end of the second pipe section is connected with the inner wall of the first pipe section, and the other end of the second pipe section extends into the third pipe section; the side wall of the third pipe section is provided with a fourth feed inlet communicated with the inner cavity of the third pipe section, and the fourth feed inlet is communicated with the third discharge outlet; and the end part of the second pipe section extending into the third pipe section is positioned between two points with the maximum distance of the inner side wall of the fourth feed port along the flowing direction of the fracturing fluid.

In some embodiments, the fracturing fluid delivery line further comprises: the guide plate is connected with at least one of the outer wall of the first pipe section and the inner wall of the third pipe section; in the axial direction of the fourth feeding hole, the guide plate gradually extends from one end close to the fourth feeding hole to one end far away from the fourth feeding hole in the direction far away from the first pipe section; the port of the second pipe section, which is far away from the first pipe section, is positioned between the guide plate and the fourth feed port.

In some embodiments, the control portion includes a rotating shaft and a helical blade located within the housing; the rotating shaft is rotatably connected with the shell and extends along the horizontal direction, and the helical blades are spirally wound on the peripheral surface of the rotating shaft along the axial direction of the rotating shaft.

In some embodiments, the sand mulling facility further includes an air compressor. And the air outlet of the air compressor is communicated with the fourth feed inlet and is used for blowing gravel and fracturing fluid in the fracturing fluid conveying pipeline into the sand mixing tank.

In some embodiments, the sand mixing equipment further comprises a skid frame, and the filtering mechanism, the sand conveying mechanism, the sand mixing tank, the storage mechanism, the material guiding mechanism, the fracturing fluid conveying pipeline and the air compressor are all mounted on the skid frame.

In some embodiments, the sand mulling apparatus further comprises: and the dry adding mechanism is communicated with the sand mixing tank and is used for adding the dry powder additive into the sand mixing tank.

In some embodiments, the sand mulling apparatus further comprises: and the liquid adding mechanism is communicated with the sand mixing tank and is used for adding a liquid additive into the sand mixing tank.

In some embodiments, the sand mulling apparatus further comprises: and the discharge mechanism is communicated with the sand mixing tank and is used for discharging the sand-containing fracturing fluid in the sand mixing tank.

The filtering mechanism and the sand mixing equipment provided by the invention have the following beneficial effects:

the invention provides a filtering mechanism which comprises a shell, a cylindrical filtering screen, at least one supporting component and a first driving component, wherein the filtering screen is supported and installed in the shell through the supporting component, the filtering screen is driven to rotate relative to the shell through the first driving component installed on the shell or a fixed object, therefore, gravel to be filtered can be added into the filtering screen through a first feed port on the shell, gravel meeting the use requirement in the gravel flows out of filtering holes in the side wall of the filtering screen in the rotating process of the filtering screen, and finally the gravel flows out of the filtering mechanism from a first discharge port of the shell for standby use, so that impurities with larger sizes can be separated, and the impurities with larger sizes are prevented from entering fracturing pumping equipment to cause the faults of the fracturing pumping equipment.

In addition, because the filter screen is the tube-shape, consequently, need not quick rotatory filter screen and can realize filtering separation to the impurity of great size, consequently, filter mechanism operates steadily, and the fault rate is low, has guaranteed the operating efficiency of oil gas field job site. Moreover, because the filter screen is located the shell, consequently, at the in-process of filtering the screening to the grit, the raise dust is difficult for appearing, has guaranteed the good air circumstance of job site, and then has guaranteed that the operation personnel's is healthy.

The beneficial technical effects of the sand mixing equipment provided by the invention are the same as those of the filtering mechanism provided by the embodiment of the invention, and are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a three-dimensional perspective view of a sand mulling apparatus according to some embodiments of the present invention;

FIG. 2 is a schematic illustration of a portion of a sand mixing apparatus according to some embodiments of the present invention;

FIG. 3 is a schematic illustration of a portion of a sand mulling apparatus according to other embodiments of the present invention;

FIG. 4 is a three-dimensional perspective view of a filter mechanism according to some embodiments of the invention;

FIG. 5 is a schematic diagram of a filter mechanism according to further embodiments of the present invention;

FIG. 6 is a left side view of the structure shown in FIG. 5;

FIG. 7 is an enlarged view of the structure at A in FIG. 5;

FIG. 8 is a schematic illustration of a portion of a filter mechanism according to further embodiments of the present invention;

FIG. 9 is a schematic diagram of a filter mechanism according to further embodiments of the present invention;

FIG. 10 is a three-dimensional perspective view of a portion of a sand mixing apparatus according to further embodiments of the present invention;

FIG. 11 is a schematic illustration of a portion of a sand mulling apparatus according to still other embodiments of the invention;

FIG. 12 is a schematic illustration of a portion of a sand mulling apparatus according to still other embodiments of the invention;

FIG. 13 is a schematic illustration of a portion of a fracturing fluid delivery line according to some embodiments of the present invention;

fig. 14 is a three-dimensional perspective view of a partial structure of a sand mixing apparatus according to further embodiments of the present invention.

Reference numerals: 100-sand mulling equipment; 1-a filtration mechanism; 101-a housing; 1011-first feed inlet; 1012-first discharge port; 1013-a first housing part; 1014-a second housing part; 1015-first opening; 1016-a second opening; 1017-a first containing cavity; 102-a filter screen; 103-a support assembly; 1031-a fixing member; 1032-a support shaft; 1033-roller tube body; 104-a first drive assembly; 1041-a motor; 1042-a drive shaft; 105-discharge blades; 106-a scaffold; 1061-a stent body portion; 1062-a fixed seat; 107-a second drive assembly; 2-a sand conveying mechanism; 3-a sand mixing tank; 4-a material storage mechanism; 401-a second feed port; 402-a second discharge port; 5-a material guiding mechanism; 501-a shell; 5011-third feed port; 5012-third discharge port; 502-a control section; 5021, a rotating shaft; 5022, a helical blade; 6-a fracturing fluid suction mechanism; 601-a fracturing fluid conveying pipeline; 6011-a first tube section; 6012-a second tube section; 60121-a first main body section; 60121 a-second main body section; 60122-a first conical transition section; 60122 a-a second conical transition section; 6013-a third tube section; 60131-fourth feed port; 6014-a guide plate; 602-a suction line; 6021-suction inlet; 603-a suction pump; 7-a sledge frame; 8-dry adding mechanism; 801-a storage hopper; 802-screw conveyor; 9-liquid adding mechanism; 901-liquid addition pump; 902-liquid add manifold; 903-a flow meter; 10-a meter; 11-a discharge mechanism; 1101-a discharge pump; 1102 — a discharge line; 1103-drain port; 12-a power mechanism; 1201-driving a motor; 1202-a hydraulic pump; 1203-hydraulic tank.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Referring to fig. 1-3, some embodiments of the present invention provide a sand mulling apparatus 100. The sand mulling apparatus 100 includes a filtering mechanism 1, a sand conveying mechanism 2, and a sand mulling tank 3. The filter mechanism 1 is used for filtering gravel. The sand conveying mechanism 2 is used for receiving gravel from a first discharge port 1012 of the filtering mechanism 1 (as shown in fig. 4) and conveying the gravel to the sand mixing tank 3. The sand mixing tank 3 is used for mixing gravel and fracturing fluid. For example, as shown in fig. 1, the sand conveying mechanism 2 may be a belt conveyor; alternatively, the sand conveying mechanism 2 may be a screw conveyor. As another example, the sand conveyance mechanism 2 may be driven by a hydraulic motor.

Referring to fig. 4-6, some embodiments of the present invention provide a filter mechanism 1 as described above, including a housing 101, a filter screen 102, at least one support assembly 103, and a first drive assembly 104. The housing 101 has a first inlet 1011 and the first outlet 1012. The filter screen 102 is located in the housing 101, the filter screen 102 is cylindrical, one end of the filter screen 102 is open toward the first inlet 1011, and a side wall of the filter screen 102 is open toward the first outlet 1012.

Illustratively, the housing 101 may be a closed shell having only a first inlet 1011 and a first outlet 1012 communicating with the inner cavity of the housing 101, and the filter screen 102 is located in the inner cavity of the housing 101; alternatively, the housing 101 may be a casing that circumferentially surrounds only a portion of the sidewall of the filter screen 102, and may be applied.

As another example, the filtering screen 102 may be a cylinder with two open ends, and the sidewall of the filtering screen is provided with filtering holes, at this time, an impurity collecting tank needs to be arranged at one end of the filtering screen 102 far away from the first feeding port 1011 to receive impurities with larger sizes; alternatively, the filter screen 102 may be a cylinder with an open end, and the side wall and the bottom wall are both provided with filter holes, and at this time, a discharge structure needs to be arranged to discharge the large-sized impurities left in the filter screen 102 out of the filter screen 102.

It should be noted that the aperture of the filtering hole of the filtering screen 102 may be selected according to the operation requirement of the oil and gas well and the protection requirement of the fracturing pumping equipment, and the aperture capable of separating the impurities with larger sizes that do not meet the use requirement (the impurities with larger sizes refer to the impurities with sizes that are easy to cause the fracture pumping equipment failure according to the operation experience, such as stones, glass, nuts, and the like, and the gravel obtained by removing the impurities with larger sizes is the gravel meeting the use requirement). In this way, the gravel to be filtered can be filled into the filter screen 102 through the first inlet 1011 of the housing 101, and the gravel that meets the use requirement flows out from the side wall of the filter screen 102 and flows out of the filter mechanism 1 through the first outlet 1012 to be used.

In this regard, in order to mount the filter screen 102 within the housing 101, at least one support assembly 103 is positioned between the housing 101 and the filter screen 102, the support assembly 103 being configured to support the filter screen 102. Illustratively, the number of the supporting members 103 may be one, and the supporting members are supported between the inner wall of the housing 101 and the outer wall of the lower end of the filtering screen 102; alternatively, as shown in fig. 4, the number of the support assemblies 103 may be plural, and the support assemblies may be sequentially spaced in the circumferential direction of the filter screen 103, for example, as shown in fig. 4, the number of the support assemblies 3 may be three, and the support assemblies may be sequentially spaced at equal intervals in the circumferential direction of the filter screen 103. As another example, the supporting component 103 may be a supporting component including two roller tubes parallel to each other, and the axes of the roller tubes are parallel to the axis of the filtering screen 102, and at this time, one supporting component 103 may be supported between the casing 101 and the lower end of the filtering screen 103; alternatively, the support member 103 may be a support member comprising a roller tube, in which case at least two support members 103 are spaced apart from each other between the housing 101 and the filter screen 103. In this way, the filter mesh 102 can be mounted in the housing 101, and the mounting is reliable.

On this basis, in order to ensure the gravel filtering efficiency of the filtering screen 102, as shown in fig. 5, a first driving assembly 104 is mounted on the housing 101 or the fixture, the first driving assembly 104 is in driving connection with the filtering screen 102, and the first driving assembly 104 is used for driving the filtering screen 102 to rotate relative to the housing 101. The transmission connection means a connection mode that the power of the first driving assembly 4 can be transmitted to the filtering screen 102 to enable the filtering screen 102 to rotate relative to the housing 101, for example, the output end of the first driving assembly 4 may be an output shaft coaxial with the axis of the filtering screen 102 to output a rotational motion, the output shaft may be connected with the filtering screen 102, and the output shaft rotates to drive the filtering screen 102 to rotate. In this manner, efficient grit filtration by rotation of the filter screen 102 is achieved. For example, the fixture may be the ground; alternatively, the fixing device may be another structure fixed relative to the casing 101, for example, the fixing device may be another structure fixed relative to the casing 101 on the filtering mechanism 1 (such as the bracket 106), or the fixing device may be another structure fixed relative to the casing 101 on the sand mixing device 100 (such as the sand conveying mechanism 2, the prying frame 7, etc.), and the application is also possible.

In summary, the present invention provides a filter mechanism 1, which includes a housing 101, a cylindrical filter screen 102, at least one support assembly 103, and a first driving assembly 104, wherein the filter screen 103 is supported and mounted in the housing 101 by the support assembly 103, the filter screen 102 is driven to rotate relative to the housing 101 by the first driving assembly 104 mounted on the housing 101 or a fixed object, so that gravel to be filtered can be added into the filter screen 102 through a first inlet 1011 on the housing 101, and gravel meeting use requirements in the filter screen 102 flows out of a filter hole on a side wall of the filter screen 102 during rotation, and finally flows out of the filter mechanism 1 from a first outlet 1012 of the housing 101 for use, so that impurities with larger sizes can be separated, and the impurities with larger sizes can be prevented from entering a fracturing pumping device to cause a failure thereof.

In addition, because the filter screen 102 is the tube-shape, can increase the screening area who filters the screening to the grit through rotatory filter screen 102, consequently, need not quick rotatory filter screen 102 and can realize filtering separation to the impurity of great size high-efficiently, consequently, filter mechanism 1 operates steadily, and the fault rate is low, has guaranteed the operating efficiency of oil gas field job site. Moreover, because the filter screen 102 is located in the housing 101, in the process of filtering and screening gravel, dust is not easy to generate, a good air environment of an operation site is ensured, and the health of operators is further ensured.

The beneficial technical effects of the sand mulling equipment 100 provided by the invention are the same as the beneficial technical effects of the filtering mechanism 1 provided by the embodiment of the invention, and are not described herein again.

It should be noted that, as shown in fig. 1, the applicant has found through research that the number of the filtering mechanisms 1 and the sand conveying mechanisms 2 in the sand mulling facility 100 may be two, and one sand conveying mechanism 2 receives gravel from one filtering mechanism 1. Therefore, the space of the sand mulling equipment 100 can be reasonably utilized, the efficiency of filtering and screening the gravel can be improved as much as possible under the condition of meeting the requirements of national standards on parameters such as equipment width and the like, the reliability of the filtering mechanism 1 can be ensured, and the reliability of the sand mulling equipment 100 is further ensured.

Referring to fig. 7, in some embodiments, the support assembly 103 includes a mount 1031, a support shaft 1032, and a idler tube 1033. The support shaft 1032 is connected with the fixing member 1031. The idler tube 1033 is mounted over the support shaft 1032, the idler tube 1033 being configured to rotate relative to the support shaft 1032. One of the housing 101 and the filter screen 102 is connected to the fixing member 1031, and the other is in rolling contact with the outer side wall of the roller tube 1033. So, when filter screen 102 is rotatory for shell 101, the inner wall rolling friction of bearing roller body 1033 outer wall and filter screen 102 outer wall or shell 101 both can support filter screen 102, can reduce the resistance when filter screen 102 rotates again, has guaranteed filter mechanism 1's reliability, and then has guaranteed the reliability of mulling equipment 100.

Illustratively, as shown in fig. 7, the fixing member 1031 may be connected to the housing 101, and the outer side wall of the roller tube 1033 may be in rolling contact with the filter screen 102.

For example, as shown in fig. 7, the fixing member 1031 may be a mounting seat including a bottom plate and two side plates perpendicular to the bottom plate, two ends of the supporting shaft 1032 are respectively fixedly connected to the two side plates, and the bottom plate of the fixing member 1031 may be connected to the housing 101 through a screw connection.

Illustratively, the support shaft 1032 and the idler tube 1033 may be coupled by bearings.

Illustratively, both ends of the support shaft 1032 may be fixedly connected with the fixing members 1031 by end plates.

Referring to fig. 5, in some embodiments, the first drive assembly 104 includes a motor 1041 and a drive shaft 1042. The motor 1041 is mounted on the housing 101. The transmission shaft 1042 penetrates the casing 101 and is rotatably connected to the casing 101, one end of the transmission shaft 1042 located inside the casing 101 is connected to the end of the filter screen 102, and the other end of the transmission shaft 1042 located outside the casing 101 is drivingly connected to the motor 1041. So design, motor 1041's output shaft is rotatory, can drive the transmission shaft 1042 rotatory, and it is rotatory finally to drive filter screen 102, realizes the filtration screening function to the grit. In addition, the rotary connection between the transmission shaft 1042 and the casing 101 can enable the filter screen 2 to be more stably installed in the casing 101, so that the reliability of the filter mechanism 1 is ensured, and further the reliability of the sand mixing device 100 is ensured; moreover, can also make filter screen 102 slope certain angle setting, for filter screen 102 horizontal setting, can hold more gravels simultaneously in the filter screen 102, improved the efficiency of filtering and sieving the gravel.

Illustratively, the motor 1041 may be removably mounted to the housing 101 by a mount. It should be noted that, in other embodiments, the motor 1041 may also be mounted on a fixed object, and the fixed object is explained as above and is not described again.

For example, the motor 1041 may be an electric motor (electric machine); alternatively, the motor 1041 may be a hydraulic motor; alternatively, the motor 1041 may be a pneumatic motor, and may be applied.

Illustratively, the drive shaft 1042 can be rotatably coupled to the housing 101 via bearings.

For example, the filter screen 102 may be a cylinder with an open end, and an end of the filter screen 102 opposite to the open end may be fixedly connected to an end of the transmission shaft 1042 located in the housing 101.

Illustratively, the other end of the transmission shaft 1042 located outside the housing 101 may be drivingly connected to the motor 1041 through a belt drive.

Referring to fig. 4 and 5, in some embodiments, the housing 101 includes a first housing portion 1013 and a second housing portion 1014. The first case unit 1013 has a cylindrical shape, one end of the first case unit 1013 is opened as the first inlet 1011, and the first case unit 1013 has a first opening 1015 on a side wall thereof. The second housing portion 1014 has a second opening 1016, the second opening 1016 is connected to the first opening 1015, the second housing portion 1014 defines a first receiving chamber 1017, and the second housing portion 1014 has a first discharge port 1012 at a position opposite to the second opening 1016. Thus, the side wall of the first housing part 1013 may be fitted around the outer periphery of the filter screen 102, so that the gravel may be prevented from splashing during the filtering and screening process, and the gravel flowing out from the side wall of the filter screen 102 may be prevented from being piled up in the housing 101 to affect the efficiency of the filtering and screening, and the second housing part 1014 may also function as a guide to guide the gravel that meets the use requirements to the sand conveying mechanism 2.

For example, the first opening 1015 may extend along the axial direction of the first housing part 1013, and the first opening 1015 may extend along the same axial length as the first housing part 1013.

For example, the first housing part 1013 and the second housing part 1014 may be one piece formed by welding; alternatively, the first case unit 1013 and the second case unit 1014 may be connected by a connector.

Referring to FIGS. 4 and 6, in some embodiments, the axis of the housing first portion 1013 is parallel to the axis of the filter screen 102, and the distance h between the inner wall of the housing first portion 1013 and the outer wall of the filter screen 102 decreases from one edge of the first openings 1015 to the other edge of the first openings 1015 in the direction M of rotation of the filter screen 102. With this configuration, when the gravel is just packed in the filter screen 102 and the flow rate of the gravel flowing out from the filter holes of the filter screen 102 is large, there is a sufficient space for the gravel to pass through between the casing 101 and the filter screen 102, and the efficiency of filtering and screening the gravel is ensured while preventing the gravel from splashing.

Referring to fig. 8, in some embodiments, the filter mechanism 1 further comprises a discharge vane 105. The discharge blades 105 are disposed spirally on the inner side wall of the filter screen 102 in the direction of the axis of the filter screen 102. In this way, when the gravel is sifted, the filter screen 102 may be rotated in the same direction as the rotation direction of the discharge blade 105; when the large-sized impurities in the filtering screen 102 need to be discharged, the filtering screen 102 can be rotated reversely, and the large-sized impurities can be discharged from the filtering screen 102 toward the opening of the first feed port 1011, so that the large-sized impurities can be discharged without occupying the space in the sand mulling equipment 100 and arranging a structure for storing the impurities, the design of the filtering mechanism 1 is simplified, and the design of the sand mulling equipment 100 is simplified.

For example, the discharge blades 105 may be perpendicular to the wall of the filter screen 102, facilitating attachment of the discharge blades 105 to the inner side walls of the filter screen 102.

Illustratively, the discharge vanes 105 may be welded to the inner side walls of the filter screen 102.

Referring to fig. 3 and 9, in some embodiments, filter mechanism 1 further includes a bracket 106 and a second drive assembly 107. The bracket 106 comprises a bracket main body part 1061 and a fixed seat 1062, the bracket main body part 1061 is connected with the casing 101, and the bracket main body part 1061 is hinged with the fixed seat 1062; the fixing seat 1062 is used to fix the filter mechanism 1 to a fixture. The second driving assembly 107 has one end hinged to the housing 101 and the other end for being hinged to the stationary object. The second driving assembly 107 is used for driving the housing 101 to rotate in a first plane relative to the fixing seat 1062. The first plane is a vertical plane where the axis of the filtering screen 102 is located when the filtering screen is in an operating state. As such, when the larger sized impurities within the filter screen 102 affect the screening efficiency of the gravel filtration, the inner larger sized impurities may be discharged by extending or shortening the second drive assembly 107, rotating the filter screen 102 within the vertical plane, with the end opening of the filter screen 102 facing the first feed opening 1011 facing downward.

For example, the support main body 1061 may be a frame structure consisting of four legs and a beam connecting the legs, the four legs are symmetrically distributed on two sides of the axis of the filtering screen 102 two by two, and two legs located on the same side of the axis of the filtering screen 102 are distributed along the direction of the axis of the filtering screen 102.

For example, the number of the fixing seats 1062 may be two, and one fixing seat 1062 is hinged to one leg of the support body 1061 near the first feeding hole 1011.

Illustratively, the second driving assembly 107 may be hingedly connected to a wall of the housing 101 opposite the first inlet 1011, such that extending the second driving assembly 107 flips the filter screen 102 to discharge the impurities within the filter screen 102.

For example, second drive assembly 107 may be a hydraulic ram.

For example, the fixed object herein refers to a fixed object other than the filter mechanism 1, for example, the fixed seat 1062 may be connected to the ground; alternatively, as shown in fig. 3, the fixing seat 1062 may also be connected to the sand conveying mechanism 2; alternatively, in the case where the sand mulling apparatus 100 includes the skid 7, the fixed seat 1062 may be connected to the skid 7.

By way of example, the fixed object herein is an object other than the filter mechanism 1, for example, the other end of the second driving assembly 107 can be hinged with the ground through a hinge seat; alternatively, the other end of the second driving assembly 107 may be hinged to the sand conveying mechanism 2; alternatively, as shown in fig. 3, in the case that the sand mulling apparatus 100 includes a skid 7, the other end of the second driving assembly 107 may also be hinged to the skid 7.

Referring to fig. 2, 10 and 11, in some embodiments, the sand mulling equipment 100 further includes a storage mechanism 4, a material guiding mechanism 5 and a fracturing fluid suction mechanism 6, and the fracturing fluid suction mechanism 6 includes a fracturing fluid conveying pipeline 601. The stock mechanism 4 includes a second feed port 401 and a second discharge port 402. The storage mechanism 4 is used for receiving and storing gravel from the sand conveying mechanism 2. The material guide mechanism 5 includes a housing 501 and a control unit 502 provided on the housing 501. Both ends of the housing 501 have a third inlet 5011 and a third outlet 5012, respectively. The third feed port 5011 is communicated with the second discharge port 402; the control unit 502 controls the flow rate of the gravel discharged from the third discharge port 5012. The fracturing fluid conveying pipeline 601 comprises a first pipeline section 6011, a second pipeline section 6012 and a third pipeline section 6013 which are sequentially connected in the pipeline extending direction. Second tube section 6012 has a diameter that is smaller than the diameter of first tube section 6011 and third tube section 6013. The joint of the second pipe section 6012 and the third pipe section 6013 is provided with a fourth feed port 60131 which is communicated with the inner cavity of the second pipe section 6012, and the fourth feed port 60131 is communicated with the third discharge port 5012.

By the design, the storage mechanism 4 can pile gravel to enable the guide mechanism 5 and the fracturing fluid conveying pipeline 601 to be in a closed state not communicated with the atmosphere; gravel can be led into the fracturing fluid conveying pipeline 601 through the material guide mechanism 5 according to the set flow rate; since the diameter of the second pipe section 6012 is smaller than the diameter of the first pipe section 6011 and the third pipe section 6013, when the fracturing fluid is jetted from the region a to the region c through the region b at a relatively high speed, a negative pressure is formed in the region d by the venturi effect, and gravel falling from the material guiding mechanism 5 is sucked into the region c. When fracturing fluid gets into c region by the b region, because the pipe diameter grow suddenly, can form a large amount of whirls (turbulent phenomenon) at the regional exit of b, the negative pressure effect that the cooperation venturi effect caused simultaneously carries out intensive mixing to the grit that sucks from d region and the fracturing fluid in the pipeline, enters into sand mixing tank 3 through third pipeline section 6013 again and carries out final thoughtlessly, has improved the mixing uniformity who is used for the sand-containing turbid liquid of fracturing operation.

The storage mechanism 4 may be a sand hopper, for example.

For example, the housing 501 may be a tilted or vertical pipe, and the control portion 502 may be a gate valve; alternatively, the control unit 502 may be a screw conveyor, and may be applied to any of them.

Illustratively, two points (points B and C) of the largest distance on the inner side wall of the fourth feed port 60131 are located on the second pipe section 6012 and the third pipe section 6013, respectively, in the flow direction N of the fracturing fluid.

Illustratively, the first and

third tube segments

6011, 6013 are the same diameter.

Illustratively, the second tube segment 6012 includes a first main segment 60121 and first tapered transition segments 60122 symmetrically connected to two ends of the first main segment 60121, where ends of the two first tapered transition segments 60122 away from the main segment 60121 are connected to an end of the first tube segment 6011 and an end of the third tube segment 6013, respectively.

Illustratively, the first, second, and

third tube segments

6011, 6012, 6013 are coaxially disposed.

Illustratively, the fracturing fluid intake mechanism 6 may further include an intake line 602 and an intake pump 603. One end of the suction line 602 has a plurality of suction ports 6021, and the other end of the suction line 602 is connected to an end of the first pipe section 6011 remote from the second pipe section 6012. A suction pump 603 is located on the suction line 602 for sucking fracturing fluid from the suction port 6021, and the suction pump 603 may be driven by a hydraulic motor.

It should be noted that, through research by the applicant, the number of the material guiding mechanism 5 and the number of the fracturing fluid conveying pipelines 601 may be two, the third discharge port 5012 of one material guiding mechanism 5 is communicated with the fourth feed port 60131 on one fracturing fluid conveying pipeline 601, and both the two first pipe sections 6011 are communicated with the suction pipeline 602. Therefore, the internal space of the sand mulling equipment 100 can be reasonably utilized, the blending efficiency is improved, and the requirement of national standard on the width of the equipment can be met.

Referring to fig. 2, 10 and 12, in some embodiments, the sand mulling equipment 100 further includes a storage mechanism 4, a material guiding mechanism 5 and a fracturing fluid suction mechanism 6, and the fracturing fluid suction mechanism 6 includes a fracturing fluid conveying pipeline 601. The stock mechanism 4 includes a second feed port 401 and a second discharge port 402. The storage mechanism 4 is used for receiving and storing gravel from the sand conveying mechanism 2. The material guide mechanism 5 includes a housing 501 and a control unit 502 provided on the housing 501. Both ends of the housing 501 have a third inlet 5011 and a third outlet 5012, respectively. The third feed port 5011 is communicated with the second discharge port 402; the control unit 502 controls the flow rate of the gravel discharged from the third discharge port 5012. The fracturing fluid conveying pipeline 601 comprises a first pipe section 6011, a second pipe section 6012 and a third pipe section 6013 which extend in the same direction, wherein the first pipe section 6011 is connected with the third pipe section 6013, one end of the second pipe section 6012 is connected with the inner wall of the first pipe section 6011, and the other end of the second pipe section 6012 extends into the third pipe section 6013; the side wall of the third pipe section 6013 is provided with a fourth feed inlet 60131 communicated with the inner cavity of the third pipe section 6013, and the fourth feed inlet 60131 is communicated with the third discharge hole 5012; along the flowing direction N of the fracturing fluid, the end part of the second pipe section 6012 extending into the third pipe section 6013 is positioned between two points (point B and point C) with the largest distance of the inner side wall of the fourth feeding port 60131.

By the design, the storage mechanism 4 can pile gravel to enable the guide mechanism 5 and the fracturing fluid conveying pipeline 601 to be in a closed state not communicated with the atmosphere; gravel can be led into the fracturing fluid conveying pipeline 601 through the material guide mechanism 5 according to the set flow rate; also, since the diameter of the second pipe section 6012 is smaller than the diameter of the first pipe section 6011 and the third pipe section 6013, when the fracturing fluid is jetted out from the region a to the region c through the region b at a relatively high speed, a negative pressure is also formed in the region d by the venturi effect, and gravel falling from the material guiding mechanism 5 is sucked into the region c. When fracturing fluid gets into c region by the b region, because the pipe diameter grow suddenly, can form a large amount of whirls (turbulent phenomenon) at the regional exit of b, the negative pressure effect that the cooperation venturi effect caused simultaneously carries out intensive mixing to the grit that sucks from d region and the fracturing fluid in the pipeline, enters into sand mixing tank 3 through third pipeline section 6013 again and carries out final thoughtlessly, has improved the mixing uniformity who is used for the sand-containing turbid liquid of fracturing operation.

Illustratively, the second pipe section 6012 includes a second main section 60121a and a second conical transition section 60122a connected between the second main section 60121a and the first pipe section 6011, and the diameter of the second conical transition section 60122a is gradually reduced along the flowing direction N of the fracturing fluid.

The number of the material guiding mechanisms 5, the number of the fracturing fluid conveying pipelines 601, the structure of the material storing mechanism 4 and the structure of the fracturing fluid suction mechanism 6 can be the same as the above structures, and are not described again.

Referring to fig. 12 and 13, in some embodiments, the fracturing fluid delivery line 601 further includes a guide plate 6014. The guide plate 6014 is coupled to at least one of an outer wall of the second tube section 6012 and an inner wall of the third tube section 6013. In the axial direction of the fourth feeding port 60131, the guide plate 6014 gradually extends from the end close to the fourth feeding port 60131 to the end far from the fourth feeding port 60131 in the direction far from the first pipe section 6011, and the end of the second pipe section 6012 far from the first pipe section 6011 is located between the guide plate 6014 and the fourth feeding port 60131. So designed, the guide plate 6014 can guide gravel from the fourth feed port 60131 to a region of the third pipe section 6013 far from the fourth feed port 60131 and close to the sand mixing tank 3, and prevent gravel from piling at the second pipe section 6012 to affect the mixing uniformity of gravel and fracturing fluid.

Illustratively, the axis of fourth feed inlet 60131 may be perpendicular to and coplanar with the axis of third tube section 6013.

Illustratively, the guide plate 6014 may form a closed cavity with a part of the outer wall of the second pipe section 6012 and a part of the inner wall of the third pipe section 6013, and the closed cavity is located on a side of the guide plate 6014 away from the fourth feeding port 60131, so that a negative pressure is formed in the region d, and thus, the uniformity of mixing of gravel and pressure liquid is ensured.

Referring to fig. 12, in some embodiments, the control portion 502 includes a spindle 5021 and a helical blade 5022 located within the housing 501. The rotating shaft 5021 is rotatably connected with the housing 501 and extends in the horizontal direction, and the helical blade 5022 is spirally wound on the outer circumferential surface of the rotating shaft 5021 in the axial direction of the rotating shaft 5021. The horizontal direction may mean that the rotating shaft 5021 is parallel to the ground where the sand mulling equipment 100 is located when the sand mulling equipment 100 is in a working state. Thus, by controlling the rotation speed of the rotating shaft 5021, the flow rate of gravel flowing out of the third discharge port 5012 can be controlled; meanwhile, the accumulated sand conveying amount can be obtained through integral calculation of the revolution of the rotating shaft 5021. Because the gravel in the storing mechanism 4 can be piled up, the spiral blades 5022 which extend spirally in the horizontal direction during sand conveying can be filled with enough gravel, and the efficiency of conveying the gravel and the metering accuracy are improved.

Illustratively, the housing 501 may extend in a horizontal direction.

Illustratively, the rotating shaft 5021 can be driven by an electric motor or a hydraulic motor to rotate, so that gravel conveying is realized.

In some embodiments, the sand mixing equipment 100 further comprises an air compressor (not shown in the drawings), and an air outlet of the air compressor is communicated with the fourth feed port 60131, so as to purge gravel and fracturing fluid in the fracturing fluid conveying pipeline 601 into the sand mixing tank 3. So design, when stopping to mix gravel and fracturing fluid, can open the air compressor machine, let in compressed air in to fracturing fluid conveying pipeline 601, sweep into muddy sand jar 3 with gravel and fracturing fluid in the fracturing fluid conveying pipeline 601, protect equipment.

Referring to fig. 1 to 3, in some embodiments, the sand mixing apparatus 100 further includes a skid frame 7, and the filtering mechanism 1, the sand conveying mechanism 2, the sand mixing tank 3, the storing mechanism 4, the material guiding mechanism 5, the fracturing fluid conveying pipeline 601 and the air compressor are all mounted on the skid frame 7. Thus, the sand mulling equipment 100 integrally forms a skid-mounted structure, so that the sand mulling equipment 100 is compact in structure, space-saving, convenient to detach and move and convenient to flow.

In addition to the above mechanisms, if the sand mulling facility 100 further includes other mechanisms (such as a dry adding mechanism, a liquid adding mechanism, a discharging mechanism, and a power mechanism), the other mechanisms may be mounted on the skid 7 to enhance the integration of the facility.

Referring to fig. 14, in some embodiments, the sand mulling apparatus 100 also includes a dry addition mechanism 8. The dry adding mechanism 8 is communicated with the sand mixing tank 3, and the dry adding mechanism 8 is used for adding dry powder additive into the sand mixing tank 8. Therefore, the sand-containing suspension can be prepared according to the operation requirements of the oil-gas well and according to certain components and proportions, so that the flowing environment of oil gas in the underground is improved, and the requirements of oil extraction and gas production are met.

Illustratively, the dry adding mechanism 8 may include a storage hopper 801 and an auger 802, the storage hopper 801 may be mounted on the sand mixing tank 3, an outlet of the storage hopper 801 is communicated with an inlet of the auger 802, and an outlet of the auger 802 is communicated with the sand mixing tank 3. In this manner, the flow rate of the dry powder additive into the sand mixing tank 3 can be controlled by controlling the rotation speed of the auger 802.

Illustratively, the number of storage hoppers 801 and augers 802 may be one; alternatively, the number of the storage hoppers 801 and the screw conveyors 802 can be multiple, and different dry powder additives can be added into the sand mixing tank 3 at the same time.

Referring to fig. 14, in some embodiments, the sand mulling apparatus 100 further includes a liquid addition mechanism 9. The liquid adding mechanism 9 is communicated with the sand mixing tank 3, and the liquid adding mechanism 9 is used for adding liquid additives into the sand mixing tank 3. Therefore, the sand-containing suspension can be prepared according to the operation requirements of the oil-gas well and according to certain components and proportions, so that the flowing environment of oil gas in the underground is improved, and the requirements of oil extraction and gas production are met.

Illustratively, the liquid adding mechanism 9 may include a liquid adding pump 901, a liquid adding manifold 902 and a flow meter 903, an inlet of the liquid adding pump 901 may be communicated with a liquid storage tank (not shown in the figure), an outlet of the liquid adding pump 902 may be communicated with the sand mixing tank 3 through the liquid adding manifold 902, and the flow meter 903 is disposed on an outlet pipeline of the liquid adding pump 901.

For example, the number of the liquid storage tank, the liquid adding pump 901 and the flow meter 903 may be multiple, and different liquid additives are added into the sand mixing tank 3 at the same time.

Referring to fig. 14, in some embodiments, the sand mulling facility 100 also includes a plurality of meters 10 for metering and displaying the types of additives in the dry addition mechanism 8 and the liquid addition mechanism 9. Therefore, the accuracy of the configuration parameters of the sand-containing turbid liquid can be increased, the fracturing effect is guaranteed, and the requirements of oil extraction and gas production are met.

Referring to fig. 3 and 14, in some embodiments, the sand mulling apparatus 100 further includes a discharge mechanism 11, the discharge mechanism 11 is communicated with the sand mulling tank 3, and the discharge mechanism 11 is used for discharging the sand-containing fracturing fluid (suspension) in the sand mulling tank 3. So, can carry out fracturing operation to the oil gas well with the turbid liquid that contains sand that mixes to fracturing pumping equipment.

Illustratively, the discharge mechanism 11 may include a discharge pump 1101 and a discharge line 1102, wherein one end of the discharge line 1102 is communicated with the sand mixing tank 3, and the other end thereof has a plurality of drain ports 1103. The discharge pump 1101 is provided on the discharge line 1102 and sucks the suspension containing sand from the sand mixing tank 3. The leakage fluid dram 1103 can communicate with the fracturing pump through the pipeline to carry the sand-containing suspension to the fracturing pump, carry out fracturing operation to the oil gas well. The discharge pump 1101 may be driven by a hydraulic motor.

Referring to fig. 1, in some embodiments, the sand mixing apparatus 100 further comprises a power mechanism 12, the power mechanism 12 comprising a drive motor 1201, a hydraulic pump 1202, and a hydraulic oil tank 1203. The hydraulic pump 1202 is communicated with the hydraulic oil tank 1203 through a hydraulic pipeline, and the driving motor 1202 is connected with the hydraulic pump 1202 and used for driving the hydraulic pump 1202 to operate to provide hydraulic oil for a hydraulic system, so that hydraulic power is provided for a hydraulic motor for driving the sand conveying mechanism 2, a hydraulic motor for driving the material guiding mechanism 5, a hydraulic motor for driving the suction pump 603, a hydraulic motor for driving the stirring mechanism on the sand mixing tank 3, a hydraulic motor for driving the suction pump 603 and a hydraulic motor for driving the discharge pump 1101 through the hydraulic system, and normal operation of the sand mixing equipment 100 is ensured.

Illustratively, power mechanism 12 may be centrally mounted at an end of pry bracket 7 remote from filter mechanism 1.

For example, a radiator (not shown in the figure) is further disposed on the inlet pipeline of the hydraulic oil tank 1203, so as to cool the hydraulic oil in the hydraulic system, and ensure the normal operation of the hydraulic system, and thus the normal operation of the sand mulling equipment 100.

For example, the number of drive motors 1201 and hydraulic pumps 1202 may be one; alternatively, the number of the driving motors 1201 and the hydraulic pumps 1202 may be two, and one driving motor 1201 drives one hydraulic pump 1202 to provide hydraulic power for other mechanisms may be used.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A filter mechanism, comprising:

the shell is provided with a first feeding hole and a first discharging hole;

the filtering screen is positioned in the shell and is cylindrical, an opening at one end of the filtering screen faces the first feeding hole, and the side wall of the filtering screen faces the first discharging hole;

at least one support assembly located between the housing and the filter screen, the support assembly for supporting the filter screen; and

a first drive assembly mounted to the housing or fixture, the first drive assembly being in driving communication with the filter screen, the first drive assembly being configured to drive the filter screen in rotation relative to the housing;

the shell comprises a first shell part and a second shell part, the first shell part is cylindrical, an opening at one end of the first shell part is the first feed port, and a first opening is formed in the side wall of the first shell part;

the second shell part is provided with a second opening, the second opening is connected with the first opening, a first containing cavity is defined by the second shell part, and a first discharge hole is formed in the position, opposite to the second opening, of the second shell part;

the axis of the first housing portion is parallel to the axis of the filter screen, and the distance between the inner wall of the first housing portion and the outer wall of the filter screen is gradually reduced from one edge of the first opening to the other edge of the first opening along the rotation direction of the filter screen.

2. The filter mechanism of claim 1, wherein the support assembly comprises:

a fixing member;

the supporting shaft is connected with the fixing piece; and

the supporting roller tube body is sleeved on the supporting shaft and is configured to rotate relative to the supporting shaft;

wherein, one of the shell and the filter screen is connected with the fixing piece, and the other is in rolling contact with the outer side wall of the carrier roller tube body.

3. The filter mechanism of claim 2, wherein the first drive assembly comprises:

a motor mounted on the housing; and

the transmission shaft penetrates through the shell and is rotatably connected with the shell, one end of the transmission shaft, which is positioned in the shell, is connected with the end part of the filtering screen, and the other end of the transmission shaft, which is positioned outside the shell, is in transmission connection with the motor.

4. A filter mechanism as claimed in any one of claims 1 to 3, further comprising:

and the discharging blades are spirally arranged on the inner side wall of the filtering screen along the axis direction of the filtering screen.

5. A filter mechanism as claimed in any one of claims 1 to 3, further comprising:

the bracket comprises a bracket main body part and a fixed seat, the bracket main body part is connected with the shell, and the bracket main body part is hinged with the fixed seat; the fixed seat is used for fixing the filtering mechanism on a fixed object; and

one end of the second driving component is hinged with the shell, and the other end of the second driving component is hinged with the fixed object; the second driving component is used for driving the shell to rotate relative to the fixed seat.

6. A sand mulling apparatus, comprising:

a filter mechanism as claimed in any one of claims 1 to 5;

the sand conveying mechanism is used for receiving the gravel from the first discharge port of the filtering mechanism and conveying the gravel to the sand mixing tank; and

and the sand mixing tank is used for mixing gravel and fracturing fluid.

7. The sand mulling apparatus of claim 6, further comprising:

the material storage mechanism comprises a second feeding hole and a second discharging hole; the storing mechanism is used for receiving and storing gravel from the sand conveying mechanism;

the material guide mechanism comprises a shell and a control part arranged on the shell; a third feeding port and a third discharging port are respectively arranged at two ends of the shell, and the third feeding port is communicated with the second discharging port; the control part is used for controlling the flow rate of the gravel flowing out of the third discharge hole; and

the fracturing fluid conveying pipeline comprises a first pipeline section, a second pipeline section and a third pipeline section which are sequentially connected along the extending direction of the pipeline, wherein the diameter of the second pipeline section is smaller than that of the first pipeline section and that of the third pipeline section; and a fourth feeding hole communicated with the inner cavity of the second pipe section is formed at the joint of the second pipe section and the third pipe section, and the fourth feeding hole is communicated with the third discharging hole.

8. The sand mulling apparatus of claim 6, further comprising:

the fracturing fluid conveying pipeline comprises a first pipe section, a second pipe section and a third pipe section which extend in the same direction, wherein the first pipe section is connected with the third pipe section, one end of the second pipe section is connected with the inner wall of the first pipe section, and the other end of the second pipe section extends into the third pipe section; the side wall of the third pipe section is provided with a fourth feeding hole communicated with the inner cavity of the third pipe section, and the fourth feeding hole is communicated with the third discharging hole; and along the flowing direction of the fracturing fluid, the end part of the second pipe section extending into the third pipe section is positioned between two points with the maximum distance of the inner side wall of the fourth feed port.

9. The sand mulling apparatus of claim 8, wherein the fracturing fluid delivery line further comprises:

the guide plate is connected with at least one of the outer wall of the first pipe section and the inner wall of the third pipe section; in the axial direction of the fourth feeding hole, the guide plate gradually extends from one end close to the fourth feeding hole to one end far away from the fourth feeding hole in the direction far away from the first pipe section; the port of the second pipe section, which is far away from the first pipe section, is positioned between the guide plate and the fourth feed port.

10. The sand mulling apparatus of claim 8,

the control part comprises a rotating shaft and a helical blade which are positioned in the shell; the pivot with the casing rotates to be connected, and extends along the horizontal direction, helical blade follows the axis direction spiral of pivot is located on the outer peripheral face of pivot.

11. A sand mixing apparatus according to any one of claims 7-10, characterised in that the sand mixing apparatus further comprises:

the air compressor machine, the gas outlet of air compressor machine with the fourth feed inlet is linked together, be used for with gravel and fracturing fluid in the fracturing fluid conveying line sweep go into the sand mixing tank.

12. The sand mulling apparatus of claim 11, further comprising:

the device comprises a sledge frame, wherein the filtering mechanism, the sand conveying mechanism, the sand mixing tank, the material storage mechanism, the material guide mechanism, the fracturing fluid conveying pipeline and the air compressor are all arranged on the sledge frame.

13. A sand mixing apparatus according to any one of claims 6-10, characterised in that the sand mixing apparatus further comprises:

and the dry adding mechanism is communicated with the sand mixing tank and is used for adding a dry powder additive into the sand mixing tank.

14. A sand mixing apparatus according to any one of claims 6-10, characterised in that the sand mixing apparatus further comprises:

and the liquid adding mechanism is communicated with the sand mulling tank and is used for adding a liquid additive into the sand mulling tank.

15. A sand mixing apparatus according to any one of claims 6-10, characterised in that the sand mixing apparatus further comprises:

and the discharge mechanism is communicated with the sand mixing tank and is used for discharging the sand-containing fracturing fluid in the sand mixing tank.