CN212609976U

CN212609976U - Pretreatment system for fracturing flowback fluid

Info

Publication number: CN212609976U
Application number: CN202021061234.4U
Authority: CN
Inventors: 潘月辉; 王栋; 何海波; 罗睿敏
Original assignee: Sichuan Collinsco Environmental Protection Technology Co ltd
Current assignee: Sichuan Collinsco Environmental Protection Technology Co ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-02-26
Anticipated expiration: 2030-06-11

Abstract

The utility model provides a pretreatment systems for flowing back is returned to fracturing, the purpose is that the existing fracturing is returned the many equipment that the double-phase pretreatment of flowing back liquid adopted and the equipment that produces occupies a large area of big technical problem to solve. The processing system comprises: the device comprises a shell, and an air floatation separation unit, a filtering unit and an oxidation unit which are arranged in the shell. The utility model discloses with air supporting separating element, filter unit and oxidation unit integration in same casing to through the overall arrangement of casing department entry and exit position, make the fracturing return flowing back in the casing carry out air supporting deoiling in proper order, filter three kinds of deoiling treatments such as deoiling and oxidation deoiling, the deoiling effect of above-mentioned three kinds of treatment methods advances gradually, thereby has guaranteed that the oil phase can fully separate with the aqueous phase in the flowing back is returned from casing exit exhaust fracturing. Therefore, the utility model discloses with less area realized that fracturing returns the required water and oil double-phase abundant separation of flowing back preliminary treatment.

Description

Pretreatment system for fracturing flowback fluid

Technical Field

The utility model belongs to the technical field of petrochemical water treatment technique and specifically relates to a pretreatment systems for flowing back is returned to fracturing.

Background

The fracturing fluid returns to the ground after completing the action with the stratum, and fracturing flow-back fluid is formed. Before oil is seen, the fracturing flow-back fluid has the characteristics of low oil content, low pH, high salinity, high turbidity, high chroma and high COD; after the oil is seen, the fracturing flow-back fluid contains a large amount of free water, emulsified water, muddy substances and various ions. Before the fracturing flowback fluid is recycled or discharged, pretreatment is carried out to separate an oil phase from a water phase.

The existing technical scheme for fracturing flow-back fluid two-phase pretreatment mainly adopts a mode of combining multiple devices, and has the problem of large occupied area of the devices.

Disclosure of Invention

To the above situation, for overcoming prior art's defect, the utility model provides a pretreatment systems for flowing back is returned to fracturing has solved the current fracturing and has returned the double-phase preliminary treatment of flowing back liquid multi-equipment that adopts and the equipment that produces and account for a big technical problem.

In order to achieve the above object, the utility model provides a following technical scheme:

a pretreatment system for a frac flowback fluid, comprising: a housing having an inner receiving space; the air floatation separation unit is arranged at the bottom of the accommodating space in the shell and comprises an air bubble generator; the filtering unit is fixed in the accommodating space inside the shell, is positioned above the air floatation separation unit and comprises a filtering cylinder; the oxidation unit is arranged in the accommodating space in the shell, is positioned in the filter cylinder and comprises a gas pipe; wherein, the bubble generator is communicated with an external air source; the gas transmission pipe is communicated with an external ozone source; the filter cartridge is provided with a jacket, through holes are distributed on the wall of the cartridge forming the jacket, and filter materials are filled in the jacket; the side wall of the shell is provided with an inlet, and the bottom of the shell is provided with an outlet; the outlet is arranged in the hollow area at the bottom of the filter cylinder.

The utility model discloses with air supporting separating element, filter unit and oxidation unit integration in same casing to through the overall arrangement of casing department entry and exit position, make the fracturing return flowing back in the casing carry out air supporting deoiling in proper order, filter three kinds of deoiling treatments such as deoiling and oxidation deoiling, the deoiling effect of above-mentioned three kinds of treatment methods advances gradually, thereby has guaranteed that the oil phase can fully separate with the aqueous phase in the flowing back is returned from casing exit exhaust fracturing. Therefore, the utility model discloses with less area realized that fracturing returns the required water and oil double-phase abundant separation of flowing back preliminary treatment.

Further, the bubble generator of the pretreatment system for the fracturing flow-back fluid comprises: the second air guide seat is hollow and annular, and is hermetically fixed at the bottom wall in the shell; the plurality of bubble nozzles are distributed and fixed on the surface of the second air guide seat; wherein, the inner wall of the second air guide seat is vertically projected on the inner wall of the filter cylinder, and the outer wall of the second air guide seat is connected with the inner wall of the shell; the bottom of the shell is provided with an air guide port communicated with the second air guide seat.

The utility model discloses an air supporting the micro-bubble that the separation element utilized bubble generator to form at first returns the aqueous double-phase air supporting separation that carries on of profit of flowing back to the fracturing in the casing. By increasing the coverage of the bubble generator in the shell and controlling the quantity and distribution density of bubbles, the fracturing flow-back fluid can be separated into two phases with high efficiency in a large range.

The air floatation separation unit in the utility model also covers the jacket area of the filter cartridge in the filter unit, on one hand, the air floatation treatment area is increased as mentioned above; on the other hand, because the precision of air flotation separation is lower to there are a large amount of tiny particle oil drips in the fracturing flow-back fluid after making the separation, this oil drip is easy to block up the filter material, consequently, introduces the bubble at the jacket bottom of packing filter material, still is favorable to promoting the filter material to be dynamic distribution and avoids the filter material to harden.

Further, the filtration unit of the pretreatment system for the fracturing flow-back fluid further comprises: and the output end of the stirring component is arranged in the jacket. This stirring subassembly includes: the rotary driving mechanism is fixed at the top wall outside the shell; the annular rotating seat is movably arranged at the top of the jacket; the stirring rods are vertically fixed on the lower surface of the annular rotating seat; wherein, the rotary driving mechanism is connected with the annular rotating seat to drive the annular rotating seat to rotate so as to enable the stirring rod to move in the jacket.

The utility model discloses a stirring subassembly that adds in the filter unit carries out slow stirring to the filter material that absorbs the little oil of fracturing flow-back fluid, makes the filter material in the jacket be dynamic distribution, is favorable to improving the contact efficiency that the flowing back was returned to filter material and fracturing, guarantees to adsorb the deoiling effect, simultaneously, also is favorable to avoiding the filter material to block up and harden.

Furthermore, the filter material adopted by the pretreatment system for the fracturing flow-back fluid is an irregular particle filter material, such as an AFM glass filter material. The irregular shape of the filter material can still keep a tighter filling state in the dynamic distribution caused by the bubbles or the stirring assembly, and the influence on the adsorption and filtration effect due to larger gaps is avoided.

Further, the oxidation unit of the pretreatment system for the fracturing flow-back fluid comprises: the first air guide seat is hollow and is hermetically fixed at the top wall of the shell; the gas transmission pipes penetrate through the top wall of the shell, are fixed with and communicated with the first gas guide seat, and are provided with a plurality of through holes on the pipe wall; wherein, first air guide seat department is equipped with the ozone access mouth, and the ozone access mouth passes through the pipeline and communicates with outside ozone source.

The utility model discloses in, in the flowing back is returned in the fracturing after air supporting and adsorption filtration treatment, its tiny particle oil drips the content and has been less. When the ozone advanced oxidation treatment is carried out on the water phase, not only can oil drops in the water phase be thoroughly removed, but also a large amount of ions in the water phase can be treated, so that the subsequent treatment is convenient.

To sum up, the utility model discloses following beneficial effect has:

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic sectional view of the present invention.

Fig. 2 is a schematic view of an assembly structure of the filter cartridge and the air flotation separation unit of the present invention.

Fig. 3 is a schematic structural diagram of the filter cartridge and the air flotation separation unit according to the present invention after assembly.

Fig. 4 is a schematic structural diagram of the driving assembly of the present invention.

Reference numerals: 1. the air bubble spraying device comprises a shell, 21. a second air guide seat, 22. an air bubble spraying head, 3. a filtering cylinder, 30. a jacket, 41. a rotary driving mechanism, 411. a rotary driving motor, 412. a driving gear, 413. a hollow external gear, 42. an annular rotating seat, 43. a stirring rod, 51. a first air guide seat, 52. an air conveying pipe, 91. an inlet, 92. an outlet, 93. an air guide port and 94. an ozone inlet.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like refer to orientations and positional relationships based on the drawings, and are used only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.

Furthermore, 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 embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features through another feature not in direct contact. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the embodiment of the present invention provides a pretreatment system for a fracturing flow-back fluid, including: the device comprises a shell 1, an air flotation separation unit, a filtering unit and an oxidation unit.

Wherein,

the casing 1 has an inner space, an inlet 91 is formed in a side wall of the casing, an outlet 92 and an air guide opening 93 are formed in a bottom of the casing, and the air guide opening 93 is communicated with an external air source through a pipeline.

The air supporting separation unit sets up and puts space bottom in casing 1, includes: a second air guide 21 and a bubble jet 22. Wherein,

the second air guide seat 21 is hollow and annular, is hermetically fixed at the bottom wall of the interior of the shell 1, and is communicated with the air guide port 93;

and a plurality of bubble nozzles 22 arranged and fixed on the surface of the second air guide seat 21 and communicated with the second air guide seat 21.

The filter unit is fixed in 1 inside accommodation space of casing to be located 2 tops of air supporting separating element, include: a filter cartridge 3 and a stirring assembly. Wherein,

the filter cartridge 3 has a jacket 30, and irregular particle filter material is filled in the jacket 30;

through holes are distributed on the surface of the cylinder wall forming the jacket 30 so as to facilitate the inflow of fracturing flow-back fluid;

as shown in fig. 3, the bottom of the filter cartridge 3 is fixed on the upper surface of the second air guide seat 21, and the bottom of the jacket 30 is sleeved with a part of the bubble jet;

as shown in fig. 4, the stirring assembly includes: a rotary drive mechanism 41, an annular rotary base 42, and a plurality of stirring rods 43, wherein,

a rotation driving mechanism 41 fixed at an outer top wall of the housing 1;

an annular rotating seat 42 movably arranged at the top of the jacket 30;

a plurality of stirring rods 43 vertically fixed at the lower surface of the annular rotating base 42, the bottom ends of the stirring rods 43 being close to the bottom of the jacket 30;

in this embodiment, the rotation driving mechanism 41 includes a rotation driving motor 411, a driving gear 412 driven by the rotation driving motor 411, and an external hollow gear 413 engaged with the driving gear 412. The annular rotating seat 42 is stepped, and the top of the annular rotating seat is fixedly embedded in a hollow area inside the outer hollow gear 413. Wherein, the rotation driving motor 411 is fixed on the top of the housing, and the driving gear 412 is disposed above the rotation driving motor 411. The bottom of the hollow external gear 413 is movably supported on the stepped surface of the annular rotary base 42 so as to be at the same level with the driving gear 412. The rotation driving motor 411 rotates the driving gear 412, and transmits the rotation to the hollow external gear 413 by meshing, thereby rotating the annular rotary base 42 fixed thereto, and further moving the stirring rod 43 fixed to the bottom of the annular rotary base 42 in the jacket.

The oxidation unit includes: a first air guide seat 51 and a plurality of air delivery pipes 52. Wherein,

the first air guide seat 51 is hollow inside and hermetically fixed on the top wall of the housing 1, and the surface thereof is provided with an ozone inlet 94 communicated with an external ozone source through a pipeline.

When in use, the air guide port and the ozone access port are respectively communicated with an external air source and an ozone source. And injecting fracturing flow-back fluid from an inlet of the side wall of the shell.

The frac flowback first enters the area between the housing and the filter cartridge. In the area, a large amount of bubbles are generated at the bubble spray head, and the oil phase in the wrapped fracturing flow-back fluid floats upwards to the liquid level and is gathered.

The fracturing flow-back fluid flows to the filter cylinder and enters the jacket from the through hole of the cylinder wall. And the filter material in the jacket is used for adsorbing and filtering oil drops in the fracturing flow-back fluid.

In the adsorption and filtration process, the rotary driving mechanism drives the annular rotating seat and the stirring rod to slowly rotate in the jacket, so that the filter material in the jacket is dynamically distributed. Meanwhile, the air bubbles generated by the air bubble spray head positioned at the bottom area of the jacket also promote the dynamic distribution of the filter material close to the air bubble spray head.

The fracturing flow-back fluid which is subjected to adsorption filtration treatment in the cartridge filter jacket further enters the hollow area of the cartridge filter through the through hole of the inner-layer cartridge wall and contacts with the gas transmission pipe. And the ozone discharged from the through hole of the gas pipe is used for carrying out advanced oxidation treatment on oil drops and other components remained in the fracturing flow-back fluid.

The fracturing flow-back fluid after the ozone advanced oxidation treatment realizes the full separation of the oil phase and the water phase, and the water phase is discharged and collected from an outlet at the bottom of the shell.

Claims

1. A pretreatment system for a frac flowback fluid, comprising:

a housing having an inner receiving space;

the air floatation separation unit is arranged at the bottom of the accommodating space in the shell and comprises an air bubble generator;

the filtering unit is fixed in the accommodating space inside the shell, is positioned above the air floatation separation unit and comprises a filtering cylinder;

the oxidation unit is arranged in the accommodating space in the shell, is positioned in the filter cylinder and comprises a gas pipe;

wherein,

the bubble generator is communicated with an external air source;

the gas transmission pipe is communicated with an external ozone source;

the filter cartridge is provided with a jacket, through holes are distributed on the wall of the jacket, and filter materials are filled in the jacket;

the side wall of the shell is provided with an inlet, and the bottom of the shell is provided with an outlet; the outlet is arranged in the hollow area at the bottom of the filter cylinder.

2. The pretreatment system for a frac flowback fluid of claim 1, wherein the oxidation unit comprises:

the first air guide seat is hollow and is hermetically fixed on the top wall of the shell;

the plurality of gas transmission pipes penetrate through the top wall of the shell and are fixed and communicated with the first gas guide seat;

wherein, first air guide seat department is equipped with the ozone and inserts the mouth, the ozone inserts the mouth and communicates with outside ozone source through the pipeline.

3. The pretreatment system for fracturing flow-back fluid of claim 2, wherein the pipe wall of the gas pipe is provided with a plurality of through holes.

4. The pretreatment system for fracturing flow-back fluid of claim 1, wherein the filter media filled in the filter cartridge is irregular particle filter media.

5. The pretreatment system for a frac flowback fluid of claim 4, wherein the filtration unit further comprises:

and the output end of the stirring component is arranged in the jacket.

6. The pretreatment system for fracturing flow back fluid of claim 5, wherein the agitation assembly comprises:

the rotary driving mechanism is fixed at the top wall outside the shell;

the annular rotating seat is movably arranged at the top of the jacket;

the stirring rods are vertically fixed on the lower surface of the annular rotating seat;

the rotary driving mechanism is connected with the annular rotating seat and drives the annular rotating seat to rotate so as to enable the stirring rod to move in the jacket.

7. The pretreatment system for fracturing flow-back fluid according to any one of claims 1 to 6, wherein the bubble generator comprises:

the second air guide seat is hollow and annular, and is hermetically fixed at the bottom wall in the shell;

the plurality of bubble nozzles are distributed and fixed on the surface of the second air guide seat and are communicated with the second air guide seat;

wherein,

the inner wall of the second air guide seat is vertically projected to the inner wall of the filter cylinder, and the outer wall of the second air guide seat is connected with the inner wall of the shell;

and the bottom of the shell is provided with an air guide port communicated with the second air guide seat.

8. The pretreatment system for fracturing flow-back fluid of claim 7, wherein the bottom of the filter cartridge is fixed at the upper surface of the second gas block.