CN216337114U - Flowing back treatment facility is returned in fracturing - Google Patents

Abstract

The utility model discloses a fracturing flow-back fluid treatment device, relates to the technical field of fracturing flow-back fluids, and is used for solving the defects of high operating condition requirement, large sludge volume and the like in a Fenton oxidation-coagulation sedimentation-combined filtration treatment combined process in the prior art. The fracturing flow-back fluid treatment equipment comprises a gel breaking and coagulating device, wherein the gel breaking and coagulating device comprises a gel breaking reaction zone, a coagulating reaction zone and a flocculation reaction zone which are sequentially communicated, and the coagulating reaction zone is provided with a magnetic powder introducing port; the water inlet of the super-magnetic separation device is communicated with a flocculation reaction zone in the gel breaking and coagulation device, and the super-magnetic separation device is used for separating magnetic flocs in a magnetic floc suspension led out from the gel breaking and coagulation device from a wastewater treatment liquid; the multi-medium filtering device is communicated with a water outlet of the super-magnetic separation device and is used for filtering the wastewater treatment liquid separated from the super-magnetic separation device. The fracturing flow-back fluid treatment equipment is used for purifying fracturing flow-back fluid.

Description

Flowing back treatment facility is returned in fracturing

Technical Field

The utility model relates to the technical field of fracturing flow-back fluid, in particular to fracturing flow-back fluid treatment equipment.

Background

The fracturing operation is an important means for oil extraction in an oil field, and the fracturing flow-back fluid is oil field waste liquid which is discharged to the ground after fracturing. In recent years, the fracturing scale is increased, and the return displacement of the fracturing return fluid is also increased gradually. The fracturing flowback fluid has complex components and contains a large amount of high molecular polymers, such as guar gum, polyacrylamide, a surfactant and the like. In addition, the fracturing flow-back fluid can also carry metal substances, rock salt, clay substances and the like in the stratum. Therefore, the fracturing flowback fluid has the characteristics of high COD (Chemical Oxygen Demand), high viscosity, high stability, high suspended matter, high treatment difficulty and the like.

The existing fracturing flow-back fluid treatment combination process has multiple kinds, and one of the treatment combination processes is 'Fenton oxidation-coagulation sedimentation-combination filtration'. The combined Fenton oxidation-coagulation sedimentation-combined filtration treatment process comprises gel breaking by a Fenton advanced oxidation method, and coagulation, sedimentation and filtration are carried out to obtain purified water. The Fenton oxidation-coagulation sedimentation-combined filtration treatment combined process has the defects of high operating condition requirement, large sludge volume and the like.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a fracturing flow-back fluid treatment device, which is used for solving the defects of high operating condition requirement, large sludge volume and the like in a Fenton oxidation-coagulation sedimentation-combined filtration treatment combined process in the prior art.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

the embodiment of the application provides fracturing flow-back fluid treatment equipment which comprises a gel breaking and coagulating device, wherein the gel breaking and coagulating device comprises a gel breaking reaction zone, a coagulating reaction zone and a flocculation reaction zone which are sequentially communicated, and the coagulating reaction zone is provided with a magnetic powder introducing port; the system comprises a glue breaking coagulation device, a supermagnetic separation device and a waste water treatment liquid separation device, wherein a water inlet of the supermagnetic separation device is communicated with a flocculation reaction zone in the glue breaking coagulation device, and the supermagnetic separation device is used for separating magnetic flocs in a magnetic floc suspension led out from the glue breaking coagulation device from the waste water treatment liquid; the multi-medium filtering device is communicated with a water outlet of the super-magnetic separation device and is used for filtering the wastewater treatment liquid separated from the super-magnetic separation device.

In some possible embodiments of the present application, a plurality of filter layers are disposed in the multi-media filtering device from top to bottom, the average particle size of the filter material in the plurality of filter layers decreases progressively from top to bottom, and the plurality of filter layers are disposed below the communicating portion of the multi-media filtering device and the ultra-magnetic separation device.

In some possible embodiments of the present application, the multiple filter layers in the multiple-media filter device include an anthracite filter layer, a quartz sand filter layer, and a gravel filter layer, which are sequentially arranged from top to bottom; or the multiple filter layers in the multi-medium filter device comprise an anthracite filter layer, a quartz sand filter layer and a manganese sand filter layer which are sequentially arranged from top to bottom.

In some possible embodiments of the present application, the fracturing flow-back fluid treatment equipment further includes a ceramic membrane filtration device, and the ceramic membrane filtration device is communicated with the water outlet of the multi-media filtration device.

In some possible embodiments of the present application, the ceramic membrane filtration device includes a ceramic filtration membrane, the ceramic filtration membrane is composed of a support layer, a filtration layer and a separation layer which are stacked, the support layer, the filtration layer and the separation layer are sequentially arranged from top to bottom and the filtration pore diameter is sequentially reduced.

In some possible embodiments of the present application, the material of the filter membrane is alumina.

In some possible embodiments of the present application, the supermagnetic separator is provided with a first sludge discharge port, and the fracturing flow-back fluid treatment apparatus further comprises a magnetic seed recovery device, wherein the magnetic seed recovery device is communicated with the first sludge discharge port of the supermagnetic separator and the magnetic powder inlet of the coagulation reaction zone.

In some possible embodiments of the present application, the magnetic seed recovery device is provided with a second sludge discharge port, and the fracturing flow-back fluid treatment apparatus further comprises a sludge dewatering device, wherein the sludge dewatering device is communicated with the second sludge discharge port of the magnetic seed recovery device.

In some possible embodiments of the present application, the frac flowback fluid treatment apparatus further comprises: the regulating tank is used for temporarily storing the fracturing flow-back fluid; the primary filtering device is communicated with the regulating tank, and the water inlet of the primary filtering device is communicated with the water inlet at the gel breaking reaction area in the gel breaking and coagulating device.

In some possible embodiments of the present application, the fracturing flow-back fluid treatment equipment further includes an intermediate tank, which is installed on a connection pipeline between the ceramic membrane filtration device and the water outlet of the multi-media filtration device and is used for adjusting the PH value of the wastewater treatment fluid.

When the fracturing flow-back fluid treatment equipment provided by the embodiment of the application is used for treating fracturing flow-back fluid, the fracturing flow-back fluid is guided into the gel breaking coagulation device, gel breaking reaction can be performed in the gel breaking reaction zone, and the viscosity in water is reduced; then, the fracturing flow-back fluid is introduced into a coagulation reaction zone, and the fracturing flow-back fluid is subjected to coagulation reaction under the action of magnetic powder and a coagulant (and a softener) due to the fact that the coagulation reaction zone is provided with a magnetic powder inlet, so that suspended matters in the fracturing flow-back fluid can form magnetic suspended matters with the magnetic powder; then, the fracturing flow-back fluid is led into a flocculation reaction zone, and the fracturing flow-back fluid and a flocculating agent are subjected to flocculation reaction, so that SS (Suspended Solid) level hardness substances in the fracturing flow-back fluid are removed; and the gel breaking and coagulating device integrates the processes of gel breaking, coagulation, softening and magnetic powder adding, the requirement on the operating condition of the fracturing flow-back fluid is low, the structure is compact, and the space utilization rate is high. For example, compared with the process equipment required by some existing 'gel breaking-coagulation-precipitation' processes, the occupied area of the gel breaking coagulation device in the embodiment of the application can be reduced by half. And then, carrying out solid-liquid separation on the magnetic floc turbid liquid led out from the gel breaking coagulation device through a super-magnetic separation device, namely separating the magnetic floc from the wastewater treatment liquid, wherein under the action of magnetic force, the separation speed of the magnetic floc carrying pollutants and the wastewater treatment liquid is high, the density of the magnetic floc is increased, and the treatment efficiency is high. For example, sludge precipitation can be completed within 5-10min and the sludge volume reduced by more than 70%. And then, the wastewater treatment liquid separated from the super-magnetic separation device is introduced into a multi-medium filtering device for filtering, so that the oil content, suspended matters and hardness in the wastewater treatment liquid can be effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic connection diagram of various devices in a fracturing flow-back fluid treatment equipment according to an embodiment of the present application;

FIG. 2 is a schematic flow chart of a fracturing flow-back fluid treatment process according to an embodiment of the present application;

fig. 3 is a schematic flow chart of step S600 in the fracturing flow-back fluid treatment process according to the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

In the description of the present application, it is to 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; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description of the present application, "and/or" is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Referring to fig. 1, the fracturing flow-back fluid treatment equipment of the embodiment of the application comprises a gel breaking coagulation device, a supermagnetic separation device and a multi-medium filtering device which are sequentially communicated. In fig. 1, a line 1 indicates a flow direction of treatment of the fracturing flow-back fluid, a line 2 indicates a flow direction of backwash water used in the filtering apparatus and a return flow direction of water generated after dewatering sludge, a line 3 indicates a flow direction of sludge generated during treatment of the fracturing flow-back fluid, and a line 4 indicates a flow direction of recovery of magnetic particles.

The gel breaking and coagulating device comprises a gel breaking reaction zone, a coagulating reaction zone and a flocculation reaction zone which are sequentially communicated. The coagulation reaction zone is provided with a magnetic powder inlet, and magnetic powder is introduced into the coagulation reaction zone, so that the gathering speed of colloid and micro suspended matters in the fracturing flow-back fluid can be accelerated under the action of a magnetic field of the magnetic powder.

The super-magnetic separation device can be a super-magnetic separator. The water inlet of the super-magnetic separation device is communicated with the flocculation reaction zone in the gel breaking reaction device, and the super-magnetic separation device can perform solid-liquid separation on magnetic floc turbid liquid led out from the flocculation reaction zone in the gel breaking reaction device, namely, the magnetic floc is separated from wastewater treatment liquid.

It should be noted that, when the ultra-magnetic separator is selected, the ultra-magnetic separator with the surface magnetic field intensity of the magnetic disk larger than 4000Gs (gauss), the spacing between the magnetic disks larger than 30mm and the water flow rate reaching 0.08m/s to 0.1m/s can be selected to ensure that enough flocs can be adsorbed on the unit area of the magnetic disk without affecting the magnetic field intensity of the magnetic disk. Of course, the diameter and the number of the magnetic disks and the rotating speed of the magnetic disks of the supermagnetic separator can be determined according to the water quantity of the fracturing flow-back fluid to be treated and the water quality condition of the fracturing flow-back fluid.

The multi-media filtration device may be a multi-media filter. The multi-medium filtering device is communicated with a water outlet of the super-magnetic separation device, and the super-magnetic separation device can separate magnetic flocs from wastewater treatment liquid in a magnetic floc suspension derived from the gel breaking coagulation device.

When the fracturing flow-back fluid treatment equipment provided by the embodiment of the application is used for treating fracturing flow-back fluid, the fracturing flow-back fluid is guided into the gel breaking coagulation device, gel breaking reaction can be performed in the gel breaking reaction zone, and the viscosity in water is reduced; then, the fracturing flow-back fluid is introduced into a coagulation reaction zone, and the fracturing flow-back fluid is subjected to coagulation reaction under the action of magnetic powder and a coagulant (and a softener) due to the fact that the coagulation reaction zone is provided with a magnetic powder inlet, so that suspended matters in the fracturing flow-back fluid can form magnetic suspended matters with the magnetic powder; then, the fracturing flow-back fluid is led into a flocculation reaction zone, and the fracturing flow-back fluid and a flocculating agent are subjected to flocculation reaction, so that SS (Suspended Solid) level hardness substances in the fracturing flow-back fluid are removed; and the gel breaking and coagulating device integrates the processes of gel breaking, coagulation, softening and magnetic powder adding, the requirement on the operating condition of the fracturing flow-back fluid is low, the structure is compact, and the space utilization rate is high. For example, compared with the process equipment required by some existing 'gel breaking-coagulation-precipitation' processes, the occupied area of the gel breaking coagulation device in the embodiment of the application can be reduced by half. And then, carrying out solid-liquid separation on the magnetic floc turbid liquid led out from the gel breaking coagulation device through a super-magnetic separation device, namely separating the magnetic floc from the wastewater treatment liquid, wherein under the action of magnetic force, the separation speed of the magnetic floc carrying pollutants and the wastewater treatment liquid is high, the density of the magnetic floc is increased, and the treatment efficiency is high. For example, sludge precipitation can be completed within 5-10min and the sludge volume reduced by more than 70%. And then, the wastewater treatment liquid separated from the super-magnetic separation device is introduced into a multi-medium filtering device for filtering, so that the oil content, suspended matters and hardness in the wastewater treatment liquid can be effectively reduced.

It should be noted that, the fracturing flow-back fluid treatment equipment may include a pH online monitoring system and a viscosity online monitoring system, the pH online monitoring system may adjust the addition amount of the acid required in the treatment process of the fracturing flow-back fluid in real time, and the viscosity online monitoring system may monitor the viscosifying condition in real time to adjust the addition amount of the gel breaker. For example, before the gel breaking reaction, the fracturing flow-back fluid is introduced into a flow cup, and the viscosity of the fracturing flow-back fluid in the flow cup is detected to monitor the viscosity change of the fracturing flow-back fluid in real time.

Based on the above, a plurality of filter layers are arranged in the multi-media filter device from top to bottom, the average particle size of the filter material in the plurality of filter layers is gradually decreased from top to bottom, and the plurality of filter layers are positioned below the communication position of the multi-media filter device and the super-magnetic separation device. The multi-media filtering device forms a filtering bed by using a plurality of filtering layers with the average particle size decreasing from top to bottom. When the wastewater treatment liquid is filtered, the wastewater treatment liquid can enter from the upper part of the multi-media filtering device, pass through the multi-layer filtering layers and then be led out from the lower part of the multi-media filtering device. In the filtering process, the filter bed can automatically form a shape of upper sparse and lower dense so as to ensure the water outlet effect of the multi-medium filtering device.

And, multi-media filter equipment still has the backwash function, multi-media filter equipment is equipped with first backwash water import and first backwash water export, wherein, first backwash water import is located multi-media filter equipment's lower part, first backwash water export is located multi-media filter equipment's upper portion, the multilayer filter layer is located first backwash water import, between the first backwash water export, backwash water gets into from the first backwash water import of multi-media filter equipment's lower part promptly, wash behind the multilayer filter layer, derive from multi-media filter equipment's upper portion again. During the backwashing process, the filter materials in the multi-layer filter layers can be fully dispersed, the layers of different filter materials cannot be disordered, and the backwashing effect is good.

In some embodiments, the multi-layer filter layer of the multi-media filter device includes an anthracite filter layer, a quartz sand filter layer and a gravel filter layer which are arranged from top to bottom in sequence.

In other embodiments, the multiple filter layers in the multi-media filter device include an anthracite filter layer, a quartz sand filter layer, and a manganese sand filter layer, which are sequentially arranged from top to bottom, and are suitable for filtering iron and manganese elements contained in the fracturing flow-back fluid.

The two multi-medium filtering devices utilize cheap and easily-obtained anthracite, quartz sand and gravel (or manganese sand) as filtering materials, and the filtering materials can be repeatedly used after backwashing, and are long in service life, low in operating cost and simple to operate.

Based on the above, in the three filter layers in the multi-media filter device, the average particle diameter of the anthracite filter layer at the top layer can be 1.2-1.8 mm; the average particle size of the quartz sand filter layer of the middle layer can be 0.8-1.4 mm; the average particle size of the gravel filtering layer or the manganese sand filtering layer at the bottom layer can be 0.5-1.0 mm. And the ratio of the height of the filter bed to the average particle size of the filter material in the multi-medium filter device can be 800-1000. The parameter selection of the filter bed ensures that the multi-medium filter device has better filtering effect.

In addition, the multi-media filter device in the fracturing flow-back fluid treatment equipment in the embodiment of the application is two, one multi-media filter device is directly put into use, and the other multi-media filter device is used for standby. When the multi-medium filter device in the using state is seriously blocked or the filter material needs to be replaced, the spare multi-medium filter device can be directly used for filtering. Therefore, the operation of the whole fracturing flow-back fluid treatment equipment cannot be influenced.

In order to further improve the filter effect to flowing back the flowing back to the fracturing, the fracturing in the embodiment of this application flows back flowing back treatment facility and still includes ceramic membrane filter equipment, and ceramic membrane filter equipment and multi-media filter equipment's delivery port intercommunication. The ceramic membrane filtering device can treat the Turbidity of the effluent of the fracturing flow-back fluid to be close to 0NTU (Nephelometric Turbidity Unit) and SS (suspended solid) less than 0.5mg/L, the treatment effect is superior to that of the prior art, the deep purification of the wastewater treatment fluid is realized, the treatment of the fracturing flow-back fluid is thorough, and the purified water can be directly recycled or reinjected. In addition, the multi-medium filtering device is used as a pretreatment unit of the ceramic membrane filtering device, so that the load of the rear-end ceramic membrane filtering device can be effectively reduced.

The filtration membrane of the ceramic membrane filtration device may be a ceramic filtration membrane including a support layer, a filtration layer, and a separation layer, which are stacked. Wherein, supporting layer, filter layer and separating layer set gradually from last to down, and the filtration aperture of supporting layer, the filtration aperture of filter layer and the filtration aperture of separating layer reduce in proper order, consequently, ceramic filtration membrane is multilayer asymmetric structure. After the fracturing flow-back fluid is treated by the ceramic filter membrane, the median of the particle size of the effluent can be less than 1 μm, which is far superior to the existing standard. And the pores of the ceramic filter membrane are uniformly distributed, the open porosity can reach 50%, and the membrane flux is large.

In some embodiments, the filtration pore size of the support layer, the filtration pore size of the transition layer, and the filtration pore size of the separation layer in the ceramic filtration membrane are gradually decreased from 10 μm to 0.6 μm. For example, the filtration pore size of the support layer is 10 μm, the filtration pore size of the transition layer is 3 μm, and the filtration pore size of the separation layer is 0.6. mu.m.

The ceramic membrane filtering device provided by the embodiment of the application can be designed to have functions of forward washing, back washing and gas washing, can automatically run to clean the filtering membrane, has less human intervention, and ensures long-term stable treatment efficiency; moreover, the flux recovery rate of the transition layer and the separation layer can reach more than 97 percent, the backwashing flux can be recovered thoroughly, and the pollution resistance is strong. For example, the ceramic membrane filtering device of the embodiment of the present application is provided with a second backwash water inlet and a second backwash water outlet, wherein the second backwash water inlet is located at a lower portion of the ceramic membrane filtering device, the second backwash water outlet is located at an upper portion of the ceramic membrane filtering device, and the ceramic filtering membrane is located between the second backwash water inlet and the second backwash water outlet, that is, backwash water enters from the second backwash water inlet at the lower portion of the ceramic membrane filtering device, and is discharged from the upper portion of the ceramic membrane filtering device after the ceramic filtering membrane is washed.

Based on the above, the material for manufacturing the ceramic filter membrane may be alumina, or may include alumina, titania and zirconia. For example, the content of alumina in the ceramic filtration membrane is 99%, and the total content of titania and zirconia is 1%. The ceramic filtering membrane of the embodiment of the application uses high-purity alumina, is made by adding titanium oxide and zirconium oxide, and can resist acid, alkali and organic solvents, so that the ceramic filtering membrane has stronger corrosion resistance, stronger anti-fouling and anti-blocking capacity and longer service life of 5 years.

The ceramic filter membrane may be manufactured by the following steps, specifically: nanometer alumina is used as raw material, polyacrylic acid is used as dispersant to prepare suspension, and polyvinyl alcohol is used to increase the viscosity of the suspension to prepare the coating raw material. Thereafter, the coating material was adjusted to different pH values, and precipitation separation was performed. Taking the liquid of different sedimentation layers as coating liquid, controlling the coating time, and preparing the multilayer asymmetric membrane structure with different thicknesses and different apertures. After the film coating is finished, sintering and forming the film, and adding a certain proportion of titanium oxide and zirconium oxide as additives in the sintering process to improve the mechanical strength, compactness, temperature resistance and corrosion resistance of the film, and finally forming the ceramic filtering film with a multilayer asymmetric structure.

In addition, the supermagnetic separator is provided with a first sludge outlet, and the magnetic flocs can be led out from the supermagnetic separator. In order to recover the magnetic powder in the magnetic floccule and further treat the sludge, the fracturing flow-back fluid treatment equipment of the embodiment of the application further comprises a magnetic seed recovery device, and the magnetic seed recovery device is communicated with the first sludge discharge port of the supermagnetic separator and the magnetic powder inlet of the coagulation reaction zone. For example, the magnetic seed recovery device is a cyclone sand remover. The magnetic seed recovery device can separate magnetic powder in the magnetic floc from sludge floc, and the separated magnetic powder can be fed into the coagulation reaction zone again through the reflux pipeline and the magnetic powder introducing port, so that the recycling of the magnetic powder is realized, and the recovery rate of the magnetic powder can reach 95%.

Based on the above, the magnetic seed recovery device is provided with the second sludge discharge port, and the fracturing flow-back fluid treatment equipment of the embodiment of the application further comprises a sludge dewatering device which is communicated with the second sludge discharge port of the magnetic seed recovery device. The sludge dewatering device may dewater sludge flocs discharged from the second sludge discharge port. For example, the sludge dewatering device is a stacked screw type sludge dewatering machine, and the stacked screw type sludge dewatering machine can generate solid sludge with the water content of less than 85%, so that centralized outward transportation treatment or resource utilization are facilitated, and the transportation cost is reduced. And a sludge concentration tank is not needed, so that the occupied area is further reduced.

In addition, in some embodiments, the fracturing flow-back fluid treatment equipment of embodiments of the present application further comprises a conditioning tank and a primary filtration device. Wherein, the fracturing returns the flowing back and can keep in the equalizing basin to subaerial fracturing after the fracturing is ended, can play the effect of regulating the water yield. The primary filtration device may be a basket filter. The water inlet of the primary filtering device is communicated with the regulating tank, and the water inlet of the primary filtering device is communicated with the water inlet of a gel breaking reaction area in the gel breaking coagulation device. Primary filter equipment can return the flowing back with the fracturing and filter large granule impurity, plays the effect of balanced quality of water.

And, the flowing back treatment facility is returned in fracturing still includes first elevator pump, and first elevator pump is two, and one in two first elevator pumps directly comes into operation, and another in two first elevator pumps is for standby. The first lift pump can be installed on the connecting tube between equalizing basin and the primary filter equipment, and the first lift pump can be promoted fracturing flow-back liquid to in the primary filter equipment.

In addition, the water outlet of the first lifting pump is provided with a return pipe, the return pipe is provided with a regulating valve, the regulating valve can be a butterfly valve, and the water outlet flow of the first lifting pump can be changed by regulating the opening degree of the butterfly valve. And still install the electromagnetic flowmeter on the connecting line between equalizing basin and the primary filter equipment, the water yield of first elevator pump can be monitored to the electromagnetic flowmeter.

The multi-media filtration device is used as a secondary filtration device, and the ceramic membrane filtration device is used as a tertiary filtration device. The first backwashing water outlet of the multi-medium filtering device and the second backwashing water outlet of the ceramic membrane filtering device are communicated with the regulating tank, the water outlet of the sludge dewatering device is communicated with the water inlet of the gel breaking coagulation device, and water produced after backwashing water and sludge dewatering is recycled through the gel breaking coagulation device, the super-magnetic separation device, the multi-medium filtering device and the ceramic membrane filtering device, so that the waste of water resources is further reduced.

Further, flowing back treatment facility is returned in fracturing of this application embodiment still includes the second elevator pump, and the second elevator pump is installed on the connecting tube between multi-media filter equipment and the delivery port of supermagnetic separator. The second lift pump is used for leading the wastewater treatment liquid in the super-magnetic separation device into the multi-medium filtering device. In a similar way, the number of the second lifting pumps is two, one of the two second lifting pumps is directly put into use, and the other one of the two second lifting pumps is used for standby.

In some embodiments, the fracturing flow-back fluid treatment equipment further comprises an intermediate tank, wherein the intermediate tank is arranged on a connecting pipeline between the ceramic membrane filtering device and the water outlet of the multi-medium filtering device. The wastewater treatment liquid filtered by the multi-medium filtering device can be used for adjusting the PH value of the wastewater treatment liquid in the intermediate tank, and then the wastewater treatment liquid with the adjusted PH value is introduced into the ceramic membrane filtering device for filtering, so that the filtering effect of the wastewater treatment liquid is better.

The fracturing flow-back fluid treatment equipment with the structure can realize the corresponding fracturing flow-back fluid treatment process, and the fracturing flow-back fluid treatment equipment can solve the same technical problem and obtain the same technical effect. The fracturing flow-back fluid treatment process is described below with reference to a specific example.

Referring to fig. 2, the fracturing flow-back fluid treatment process of the embodiment of the application comprises the following steps:

step S200: and adding a gel breaker into the fracturing flow-back fluid to carry out gel breaking reaction to obtain gel breaking treatment fluid.

Step S300: and adding a coagulant, magnetic powder and a softener into the gel breaking treatment solution to carry out coagulation reaction to obtain a coagulation treatment solution.

Step S400: and adding a flocculating agent into the coagulation treatment liquid for flocculation reaction to obtain a magnetic floc suspension containing magnetic flocs and the wastewater treatment liquid.

Step S500: separating the magnetic flocs in the magnetic floc suspension from the wastewater treatment liquid under the action of magnetic force to obtain a magnetic floc mixture and a wastewater treatment liquid respectively.

Step S600: and introducing the wastewater treatment liquid into a multi-medium filtering device for filtering to obtain purified wastewater treatment liquid.

The fracturing flow-back fluid treatment process of the embodiment of the application can obtain the same technical effect as the fracturing flow-back fluid treatment equipment, and the process is not repeated here.

Based on this, the step S200 specifically includes:

sulfate or sodium hypochlorite is added into the fracturing flow-back fluid as a gel breaker, the dosage of the gel breaker is 100-500ppm (Parts Per Million of concentration), and gel breaking reaction is carried out for 30 minutes to obtain gel breaking treatment fluid.

The step S300 specifically includes:

and adding polyaluminium chloride into the gel breaking treatment solution as a coagulant, magnetic powder and a softener, and carrying out coagulation reaction for 5 minutes to obtain a coagulation treatment solution.

Wherein the dosage of the polyaluminium chloride is 500-1000ppm, the dosage of the magnetic powder is 25-50ppm, and the dosage of the softener is 1500-2000 ppm.

It should be noted that, during the initial debugging period, the amount of the magnetic powder added may be 500-1000 ppm.

The step S400 specifically includes:

adding polyacrylamide serving as a flocculating agent into the coagulation treatment liquid, wherein the dosage of the polyacrylamide is 5-10ppm, and carrying out flocculation reaction for 5 minutes to obtain a magnetic floc suspension containing magnetic flocs and wastewater treatment liquid.

Before the step S200, the fracturing flow-back fluid treatment process according to the embodiment of the present application further includes:

step S100: and (4) primarily filtering the fracturing flow-back fluid.

Further, the step S300 specifically includes:

and adjusting the pH value of the fracturing flow-back filtrate to 5.

And adding a gel breaker into the fracturing flow-back fluid with the pH of 5 for gel breaking reaction to obtain a gel breaking treatment fluid.

It should be noted that the PH of the frac flowback filtrate may be adjusted to about 5 by adding an acidic substance to the frac flowback filtrate.

In some embodiments, referring to fig. 3, the step S600 specifically includes:

step S601: and (4) introducing the wastewater treatment liquid into a multi-medium filtering device for filtering to obtain wastewater filtrate.

Step S602: and (4) introducing the wastewater filtrate into a ceramic membrane filtering device for filtering to obtain purified wastewater treatment liquid.

Based on the above, between the step S601 and the step S602, the fracturing flow-back fluid treatment process of the embodiment of the present application further includes:

and introducing the wastewater filtrate into an intermediate tank for pH value adjustment.

In order to realize magnetic powder recovery and sludge treatment, after the obtaining of the magnetic floc mixture, the fracturing flow-back fluid treatment process of the embodiment of the application further comprises:

separating the magnetic powder in the magnetic floc mixture from the sludge to obtain the magnetic powder and the sludge.

Adding the magnetic powder into the gel breaking treatment liquid.

And (4) dehydrating the sludge.

Before the above-mentioned sludge is dehydrated, the fracturing flow-back fluid treatment process of this application embodiment still includes:

adding cationic polyacrylamide with molecular weight of 800 ten thousand and ion degree of 30-50 into sludge.

The cationic polyacrylamide with the molecular weight of 800 ten thousand and the ionic degree of 30-50 can improve the dehydration performance of the sludge, so that the water content of the sludge dehydrated by the stacked screw type sludge dehydrator can be less than 85%.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

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

Claims (10)

1. A frac flowback fluid treatment apparatus, comprising:

the gel breaking and coagulating device comprises a gel breaking reaction zone, a coagulating reaction zone and a flocculation reaction zone which are sequentially communicated, wherein the coagulating reaction zone is provided with a magnetic powder introducing port;

the system comprises a glue breaking coagulation device, a supermagnetic separation device and a waste water treatment liquid separation device, wherein a water inlet of the supermagnetic separation device is communicated with a flocculation reaction zone in the glue breaking coagulation device, and the supermagnetic separation device is used for separating magnetic flocs in a magnetic floc suspension led out from the glue breaking coagulation device from the waste water treatment liquid;

the multi-medium filtering device is communicated with a water outlet of the super-magnetic separation device and is used for filtering the wastewater treatment liquid separated from the super-magnetic separation device.

2. The fracturing flow-back fluid treatment equipment of claim 1, wherein a plurality of filter layers are arranged in the multi-media filter device from top to bottom, the average particle size of the filter materials in the filter layers is gradually reduced from top to bottom, and the filter layers are positioned below the communication part of the multi-media filter device and the supermagnetic separation device.

3. The frac flowback fluid treatment apparatus of claim 2, wherein the multiple filter layers of the multi-media filter device comprise an anthracite filter layer, a quartz sand filter layer and a gravel filter layer arranged in sequence from top to bottom;

or the multiple filter layers in the multi-medium filter device comprise an anthracite filter layer, a quartz sand filter layer and a manganese sand filter layer which are sequentially arranged from top to bottom.

4. The frac flowback fluid treatment apparatus of claim 1, further comprising:

and the ceramic membrane filtering device is communicated with the water outlet of the multi-medium filtering device.

5. The fracturing flow-back fluid treatment facility of claim 4, wherein the ceramic membrane filtration device comprises:

ceramic filtration membrane, ceramic filtration membrane comprises supporting layer, filter layer and the separating layer of range upon range of setting, the supporting layer the filter layer reaches the separating layer sets gradually from last to down, and filter the aperture reduces in proper order.

6. The fracturing flow-back fluid treatment equipment of claim 5, wherein the filter membrane is made of alumina.

7. The frac flowback fluid treatment apparatus of claim 5, wherein the ultra-magnetic separator is provided with a first sludge discharge port, the frac flowback fluid treatment apparatus further comprising:

and the magnetic seed recovery device is communicated with the first sludge outlet of the supermagnetic separator and the magnetic powder inlet of the coagulation reaction zone.

8. The apparatus of claim 7, wherein the magnetic seed recovery device is provided with a second sludge discharge port, and further comprising:

and the sludge dewatering device is communicated with the second sludge discharge port of the magnetic seed recovery device.

9. The fracturing flow-back fluid treatment apparatus of any one of claims 1 to 3, further comprising:

the regulating tank is used for temporarily storing the fracturing flow-back fluid;

the primary filtering device is communicated with the regulating tank, and the water inlet of the primary filtering device is communicated with the water inlet at the gel breaking reaction area in the gel breaking and coagulating device.

10. The frac flowback fluid treatment apparatus of claim 4, further comprising:

and the intermediate tank is arranged on a connecting pipeline between the ceramic membrane filtering device and the water outlet of the multi-medium filtering device and is used for adjusting the pH value of the wastewater treatment liquid.

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