CN107235580B - Treatment method and equipment for fracturing flowback fluid of oil and gas field drilling well - Google Patents
Treatment method and equipment for fracturing flowback fluid of oil and gas field drilling well Download PDFInfo
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- CN107235580B CN107235580B CN201710342391.9A CN201710342391A CN107235580B CN 107235580 B CN107235580 B CN 107235580B CN 201710342391 A CN201710342391 A CN 201710342391A CN 107235580 B CN107235580 B CN 107235580B
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- 239000012530 fluid Substances 0.000 title claims abstract description 92
- 238000011282 treatment Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 238000005189 flocculation Methods 0.000 claims description 56
- 230000016615 flocculation Effects 0.000 claims description 56
- 238000000926 separation method Methods 0.000 claims description 52
- 238000007254 oxidation reaction Methods 0.000 claims description 44
- 239000000126 substance Substances 0.000 claims description 44
- 239000007788 liquid Substances 0.000 claims description 40
- 150000002500 ions Chemical class 0.000 claims description 35
- 238000001556 precipitation Methods 0.000 claims description 30
- 230000003647 oxidation Effects 0.000 claims description 29
- 239000008394 flocculating agent Substances 0.000 claims description 26
- 238000005352 clarification Methods 0.000 claims description 24
- 239000010802 sludge Substances 0.000 claims description 23
- 239000000701 coagulant Substances 0.000 claims description 14
- 239000010865 sewage Substances 0.000 claims description 10
- 230000015556 catabolic process Effects 0.000 claims description 9
- 238000006731 degradation reaction Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 150000003384 small molecules Chemical class 0.000 claims description 7
- 238000009388 chemical precipitation Methods 0.000 claims description 6
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- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- -1 hydroxide ions Chemical class 0.000 claims 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 25
- 230000003197 catalytic effect Effects 0.000 description 6
- 238000005086 pumping Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
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- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229960004887 ferric hydroxide Drugs 0.000 description 2
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
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- 238000006555 catalytic reaction Methods 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
- E21B41/0057—Disposal of a fluid by injection into a subterranean formation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a treatment method and equipment for fracturing flowback fluid of drilling of an oil-gas field. The three functions of oil recovery, water treatment and mud solidification of the fracturing flowback fluid at one time can be realized, the standard discharge or reinjection application of the fracturing flowback fluid is realized, the purpose of resource utilization is realized, the method has great social and economic significance on pollutants in oilfield drilling operation, the transportation, storage and treatment cost of the fracturing fluid can be reduced, the resource reutilization can be realized, and the water can be used as other purposes on the well.
Description
Technical Field
The invention relates to equipment applied to an oil and gas field, in particular to a method and equipment for treating drilling fracturing flowback fluid of the oil and gas field.
Background
After the completion of drilling, the oil and gas field (hereinafter referred to as "oil and gas field") needs to be subjected to fracturing operation. The purpose of the fracturing operation is to utilize the chemical corrosion component of the fracturing fluid to fracture and dredge the gap containing oil and gas of the rock stratum under the action of pressure, so that the oil gas can smoothly concentrate into the well along or through the gap and be extracted out of the well by lifting the oil pumping machine. The fracturing fluid is prepared manually, contains a plurality of (about twenty or more) chemical substances and a plurality of fracturing functional substances, has chemical corrosiveness, cannot remain in a stratum, and needs to be treated to meet the standard of environmental protection after being pumped back to the ground through the flowback of an oil well for emission or recycling.
The fracturing flowback fluid contains oil, mineralized water, chemical substances and fracturing functional substances, and is strong in corrosiveness and acidity, so that the fracturing flowback fluid is difficult to treat by adopting a traditional method. It is reported that the existing fracturing flowback fluid is largely discarded in the storage pool of the gobi of the desert grassland to form serious environmental pollution hidden trouble because various methods such as biology, materialization, membrane filtration and the like cannot be effectively degraded due to the special components.
Disclosure of Invention
The invention provides a treatment method and equipment for a well drilling fracturing flowback fluid of an oil and gas field, which overcome the defects of the treatment of the fracturing flowback fluid in the background technology.
One of the adopted technical schemes for solving the technical problems is as follows:
the treatment method of the oil and gas field drilling fracturing flowback fluid comprises the following steps:
a step (1) of oil-gas separation, in which oil-water of the fracturing flowback fluid is separated and the separated oil is recovered;
step (2), regulating the PH value of the fracturing flowback fluid from which the oil is separated;
step (3), the electric flocculation step, namely sending the fracturing flowback fluid with the regulated PH value into an electric flocculation container, wherein a first electrode group is arranged in the electric flocculation container, the first electrode group obtains electric energy, and the OH ions are electrolyzed and separated out from the liquid, and electrode ions are obtained, so that the fracturing flowback fluid generates degradation oxidation reaction, the OH ions and the electrode ions are combined into flocculating agent, the flocculating agent and the fracturing flowback fluid generate flocculation reaction to flocculate harmful substances in the fracturing flowback fluid, and then the flocculating agent is precipitated for treatment;
a step (4) of primary materialized precipitation clarification, in which at least one of flocculating agent and coagulant is added into the fracturing flowback fluid after the electric flocculation step, so that the materialized precipitation of the fracturing flowback fluid is clarified;
step (5), an electrocatalytic oxidation step is carried out to generate OH ions, wherein the OH ions destroy and break the macromolecular structure of harmful substances in the fracturing flowback fluid to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize innocuity;
step (6), a secondary materialized precipitation clarification step, namely adding at least one of flocculant and coagulant into the fracturing flowback fluid subjected to the electrocatalytic oxidation sewage step to realize further clarification of the materialized precipitation of the fracturing flowback fluid;
and (7) separating mud from water, separating out precipitated sludge, and performing filter pressing treatment on the sludge.
In one embodiment: in the oil-gas separation step, the fracturing flowback fluid flows into a separation container, micro bubbles generated by an electric floatation device in the separation container lift micro oil strains mixed in the liquid to the liquid surface, the oil on the liquid surface is skimmed into an oil guide groove around an opening on the separation container by the micro bubbles for treatment and recovery, and the fracturing flowback fluid from which the oil is separated is pumped and discharged to the next step for treatment.
The second technical scheme adopted for solving the technical problems is as follows:
an oil and gas field drilling fracturing flow-back fluid treatment apparatus comprising:
the oil-gas separation device separates oil and water of the fracturing flowback fluid and recovers the separated oil;
the electric flocculation device comprises an electric flocculation container and a first electrode group arranged in the electric flocculation container, the electric flocculation container is communicated with the oil-gas separation device, the first electrode group obtains electric energy, OH ions are electrolyzed and separated out from liquid, and electrode ions are obtained, so that the fracturing flowback liquid generates degradation oxidation reaction, the OH ions and the electrode ions are combined into flocculating agent, the flocculating agent and the fracturing flowback liquid generate flocculation reaction to flocculate harmful substances in the fracturing flowback liquid, and then the flocculating agent is precipitated for treatment;
the first materialized precipitation clarifying device comprises a first clarifying container and a first dosing device, wherein the first clarifying container is connected with the electric flocculation container, and the first dosing device is connected with the first clarifying container so as to add at least one of flocculating agent and coagulant into the first clarifying container, so that materialized precipitation of the fracturing flowback fluid is clarified;
the electrocatalytic oxidation device comprises a treatment container and an electrocatalytic oxidation device arranged in the treatment container, wherein the treatment container is communicated with the first clarification container, and the electrocatalytic oxidation device generates electrocatalytic oxidation reaction to generate OH ions, the OH ions destroy and break the macromolecular structure of harmful substances in the fracturing flowback fluid to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize innocuity;
the second chemical precipitation clarifying device comprises a second clarifying container and a second dosing device, wherein the second clarifying container is communicated with the processing container, and the second dosing device is connected with the second clarifying container so as to add at least one of flocculating agent and coagulant into the second clarifying container, so that the fracturing flowback fluid physical precipitation realizes further clarification; and
The sludge press filtration device comprises a press filter, and the press filtration treatment is carried out on the clarified and precipitated sludge.
In one embodiment: the oil-water-mud separation device comprises a separation container, an oil guiding groove and an electric floatation device, wherein the oil guiding groove is fixedly arranged around an opening on the separation container, the separation container is provided with a separation water inlet and a separation water outlet, the electric floatation device is arranged in the separation container so as to generate micro bubbles, the fracturing flowback fluid flows into the separation container through the separation water inlet, the micro bubbles generated by the electric floatation device lift up to the liquid surface with micro oil strains mixed in the liquid, the oil on the liquid surface is skimmed into the oil guiding groove by the micro bubbles for treatment and recovery, and the separation water outlet is connected with the electric flocculation container.
In one embodiment: the first electrode group in the electric flocculation device comprises two electrode baskets made of insoluble metal materials, meshes are formed in the electrode baskets, the two electrode baskets can be respectively connected with the positive electrode and the negative electrode of a power supply in a conductive manner, and the electrode baskets are used for placing electrode particles capable of being electrolyzed into electrode ions; wherein: the electrode basket obtains electric energy, and electrode particles are electrolyzed into electrode ions.
In one embodiment: the electric flocculation device also comprises a third dosing device which is connected with the electric flocculation container to add chemical materials into the electric flocculation container to adjust the PH value of the fracturing flowback fluid.
Compared with the background technology, the technical proposal has the following advantages:
the three functions of oil recovery, water treatment and mud solidification of the fracturing flowback fluid at one time can be realized, the standard discharge or reinjection application of the fracturing flowback fluid is realized, the purpose of resource utilization is realized, the method has great social and economic significance on pollutants in oilfield drilling operation, the transportation, storage and treatment cost of the fracturing fluid can be reduced, the resource reutilization can be realized, and the water can be used as other purposes on the well.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic illustration of a method of treating a drilling fracturing flow-back fluid of an oil and gas field.
FIG. 2 is a schematic diagram of an oil and gas field drilling fracturing flow-back fluid treatment apparatus.
Detailed Description
Referring to fig. 1, the method for treating the fracturing flowback fluid of the drilling well of the oil and gas field comprises the following steps:
a step (1) of oil-gas separation, in which oil-water of the fracturing flowback fluid is separated and the separated oil is recovered; the method comprises the following specific steps: pumping the fracturing flowback fluid into a separation container with a bubble generator through a sewage pump, enabling the fracturing flowback fluid to flow into the separation container, enabling micro bubbles generated by an electric floatation device in the separation container to lift to the liquid surface with micro oil strains mixed in the liquid, skimming the oil on the liquid surface into an oil guide groove around an opening on the separation container by the micro bubbles for treatment and recovery, and pumping and discharging the fracturing flowback fluid for separating oil to the next step for treatment;
a step (2) of adjusting the pH value of the fracturing flowback fluid from which the oil is separated by adding a chemical material such as ferric hydroxide;
step (3), an electric flocculation step, namely sending the fracturing flowback fluid with the PH value regulated into an electric flocculation container, wherein a first electrode group is arranged in the electric flocculation container, the first electrode group obtains electric energy, and the OH ions are electrolyzed and separated out from the fluid, and electrode ions are obtained, so that the fracturing flowback fluid generates degradation oxidation reaction, and the OH ions and the electrode ions are combined into a flocculating agent, and the flocculating agent and the fracturing flowback fluid generate flocculation reaction to flocculate harmful substances in the fracturing flowback fluid, and then are precipitated for treatment;
a step (4) of primary materialized precipitation clarification, in which at least one of flocculating agent and coagulant is added into the fracturing flowback fluid after the electric flocculation step, so that the materialized precipitation of the fracturing flowback fluid is clarified; the pH value can be adjusted by adding at least one of flocculant and coagulant; such as ferric hydroxide;
step (5), an electrocatalytic oxidation step is carried out to generate OH ions, wherein the OH ions destroy and break the macromolecular structure of harmful substances in the fracturing flowback fluid to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize innocuity;
step (6), a secondary materialized precipitation clarification step, namely adding at least one of flocculant and coagulant into the fracturing flowback fluid subjected to the electrocatalytic oxidation sewage step to realize further clarification of the materialized precipitation of the fracturing flowback fluid; the pH value can be adjusted by adding at least one of flocculant and coagulant;
and (7) separating mud from water, separating out precipitated sludge, and performing filter pressing treatment on the sludge. The method specifically comprises the following steps: step 71, delivering sludge precipitated in the electric flocculation step, the primary materialized precipitation clarification step, the electric catalytic oxidation step and the secondary materialized precipitation clarification step to a sludge concentration place, such as a concentration tank, and delivering upper water separated after the sludge in the concentration tank is stood back to the electric catalytic oxidation step for electric catalytic oxidation reaction; and step 72, performing filter pressing on the concentrated sludge to generate a sludge cake, and sending the generated filter pressing water back to the electrocatalytic oxidation step for electrocatalytic oxidation reaction.
Referring to fig. 2, the treatment apparatus for fracturing flowback fluid of oil and gas field well comprises an oil-gas separation device 10, an electric flocculation device 20, a first physical and chemical precipitation clarification device 30, an electric catalytic oxidation device 40, a second physical and chemical precipitation clarification device 50 and a mud-water separation device 60.
The oil-gas separator 10 separates oil and water from the fracturing flowback fluid and recovers the separated oil.
The electric flocculation device 20 comprises an electric flocculation container and a first electrode group arranged in the electric flocculation container, wherein the electric flocculation container is communicated with the oil-gas separation device, the first electrode group obtains electric energy, and the electric flocculation container is used for electrolyzing out OH ions in liquid and obtaining electrode ions, so that the fracturing flowback fluid generates degradation and oxidation reaction, so that macromolecules and chemical substances are subjected to degradation and oxidation reaction, the OH ions and the electrode ions are combined into flocculating agents, and the flocculating agents and the fracturing flowback fluid generate flocculation reaction to flocculate harmful substances in the fracturing flowback fluid, and then the flocculating agents are precipitated for treatment; the structure of the electric flocculation device can be referred to an electric flocculation device and a method for sewage treatment in the prior application of the applicant. The electric flocculation device adopts a three-dimensional electrode with an ultra-large specific surface area, and the fracturing flowback fluid realizes degradation and oxidation reaction of macromolecules and chemical substances under the action of the three-dimensional electrode with the ultra-large specific surface area, and enables chemical components and degraded macromolecular substances to react with the three-dimensional electrode substances in a catalysis way to form a microparticle structure which can be adsorbed by a flocculating agent, so that the microparticle structure is removed by precipitation.
The first materialized precipitation clarifying device 30 comprises a first clarifying container and a first dosing device, wherein the first clarifying container is connected with an electric flocculation container, the first dosing device is connected with the first clarifying container so as to add at least one of flocculating agent and coagulant into the first clarifying container, and the fracturing flowback fluid enters the materialized precipitation clarifying device after being broken by the electric flocculation device, and is precipitated and clarified under the action of the flocculating agent in the device, so that the materialized precipitation of the fracturing flowback fluid is clarified. According to the requirement, the device also comprises a first stirring device arranged in the first clarifying container, and stirring is realized through the first stirring device.
The electrocatalytic oxidation device 40 comprises a treatment container and an electrocatalytic oxidation device arranged in the treatment container, wherein the treatment container is communicated with the first clarification container, and the electrocatalytic oxidation device generates electrocatalytic oxidation reaction to generate OH ions, the OH ions destroy and break the macromolecular structure of harmful substances in the fracturing flowback fluid to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize harmless treatment. In the first materialized precipitation clarifying device, the clarified liquid also contains a large amount of micromolecular substances, the COD index of the clarified liquid can not meet the environmental protection requirement, and the electrocatalytic oxidation device can deeply degrade the clarified liquid to reach the standard.
The second chemical precipitation clarifying device 50 comprises a second clarifying container and a second dosing device, wherein the second clarifying container is communicated with the processing container, and the second dosing device is connected with the second clarifying container so as to add at least one of flocculating agent and coagulating agent into the second clarifying container, so that the physical and chemical precipitation of the fracturing flowback fluid is further clarified, and at the moment, the standard reaching water after precipitation clarification can be discharged or recycled.
The mud-water separation device 60 comprises a concentration area 61 and a mud filter press device 62; the sludge precipitated by the electric flocculation device, the primary materialized precipitation clarification device, the electric catalytic oxidation device and the secondary materialized precipitation clarification device is pumped into a sludge concentration field 61 by a sludge pump; the sludge press filtration device 62 comprises a press filter, and presses and processes the sludge in the sludge concentration area 61 into sludge cakes so as to facilitate centralized and outward transportation centralized processing; a water pump is additionally arranged to pump the upper water of the sludge concentration area 61 and the filter-press water filtered by the filter press back to the electrocatalytic oxidation device.
The concrete structure of the oil-water-mud separation device is as follows: the fracturing flow-back fluid flows into the separation container through the separation water inlet, the micro bubbles generated by the electrical floatation device lift up to the liquid level with the micro oil strains mixed in the liquid, and the oil on the liquid level is skimmed into the oil guiding groove by the micro bubbles for treatment and recovery, and the separation water outlet is connected with the flocculation container. The concrete structure is as follows: the oil guide groove is fixedly arranged around the upper opening of the separation container so as to surround the upper opening of the separation container. In this embodiment: the oil guiding groove comprises an annular wall fixedly connected around the wall of the separating container and an outer peripheral wall extending upwards from the outer periphery of the annular wall, the oil guiding groove is formed among the wall of the separating container, the annular wall and the outer peripheral wall, and an upper port of the outer peripheral wall is positioned above an upper port of the wall of the separating container. The water carried by the oil led into the oil guiding groove is pumped and discharged to the next working section (in the electric flocculation container) by the electric pump for treatment. The separating water inlet can be arranged in the middle of the wall of the separating container, and can also comprise a liquid inlet pipe which is inserted into the liquid in the separating container from top to bottom, and the lower port of the liquid inlet pipe is positioned below the liquid level of the liquid in the separating container. If necessary, a ventilation device is also included, which is provided at the top of the separation vessel to accelerate the gas discharge. Wherein: the oil guide groove is communicated with the oil storage device, and oil enters the oil guide groove and flows to the oil storage device (such as a barrel, a tank, a groove, a ground pipe and the like) arranged outside the equipment. The electric floatation device comprises a micro-bubble electric generation device and a floatation-assisting air micro-bubble generator.
The electrocatalytic oxidation device comprises a treatment container and an electrocatalytic oxidation device arranged in the treatment container, wherein the treatment container is connected with a water outlet of an electrocatalytic flocculation container, the electrocatalytic oxidation device generates electrocatalytic oxidation reaction to generate OH hydroxyl radicals (OH ions), the OH hydroxyl radicals destroy and break up macromolecular structures of harmful substances in sewage to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize harmlessness, so that the sewage is degraded to required indexes through the electrocatalytic oxidation reaction, and can be directly discharged or used as reinjection water; the degradation water outlet of the electrocatalytic oxidation sewage device is communicated with a second clarification container. If necessary, an exhaust ventilator provided at the top of the process vessel to ventilate and exhaust the gases generated during the reaction may be further included. And the sewage treatment device can also comprise an oil discharge pipeline for discharging surface layer oil slivers, wherein the oil discharge pipeline is communicated with the treatment container and corresponds to the sewage liquid level so as to discharge the oil slivers floating on the liquid level. One or more groups of the electrocatalytic oxidation devices can be arranged in series according to the requirement, so that the liquid sequentially passes through the groups of the electrocatalytic oxidation devices.
The first electrode group in the electric flocculation device comprises two electrode baskets made of insoluble metal materials, meshes are formed in the electrode baskets, the two electrode baskets can be respectively connected with the positive electrode and the negative electrode of a power supply in a conductive manner, and the electrode baskets are used for placing electrode particles capable of being electrolyzed into electrode ions; wherein: the electrode basket obtains electric energy, and electrode particles are electrolyzed into electrode ions.
Preferably, the electroflocculation device further comprises a third dosing device connected to the electroflocculation vessel for adding chemical material to the electroflocculation vessel to adjust the pH.
The system also comprises an electric control system 70 which is connected with the oil-gas separation device 10, the electric flocculation device 20, the first materialized precipitation clarification device 30, the electric catalytic oxidation device 40, the second materialized precipitation clarification device 50 and the mud-water separation device 60 in a controlled manner according to requirements, and is used for realizing the automatic control of the work of the fracturing flowback fluid such as the retention among all process devices, the reaction time, the pumping drainage, the ventilation and the like.
The pH was adjusted to about 7.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and therefore should not be taken as limiting the scope of the invention, for all changes and modifications that come within the meaning and range of equivalency of the claims and specification are therefore intended to be embraced therein.
Claims (2)
1. The treatment method of the fracturing flowback fluid of the drilling well of the oil and gas field is characterized by comprising the following steps:
the treatment method applies oil and gas field drilling fracturing flowback fluid treatment equipment, and the oil and gas field drilling fracturing flowback fluid treatment equipment comprises the following components:
the oil-gas separation device separates oil and water of the fracturing flowback fluid and recovers the separated oil; the oil-gas separation device comprises a separation container, an oil guiding groove and an electric floatation device, wherein the oil guiding groove is fixedly arranged around an opening on the separation container, the separation container is provided with a separation water inlet and a separation water outlet, the electric floatation device is arranged in the separation container so as to generate micro bubbles, the fracturing flowback fluid flows into the separation container through the separation water inlet, the micro bubbles generated by the electric floatation device lift up to the liquid surface with micro oil strains mixed in the liquid, the oil on the liquid surface is skimmed into the oil guiding groove by the micro bubbles for treatment and recovery, and the separation water outlet is connected with the electric flocculation container;
the electric flocculation device comprises an electric flocculation container and a first electrode group arranged in the electric flocculation container, the electric flocculation container is communicated with the oil-gas separation device, the first electrode group obtains electric energy, hydroxide ions are electrolyzed and separated out from liquid, electrode ions are obtained, the fracturing flowback liquid generates degradation oxidation reaction, the hydroxide ions and the electrode ions are combined into flocculating agent, the flocculating agent and the fracturing flowback liquid generate flocculation reaction to flocculate harmful substances in the fracturing flowback liquid, and then the harmful substances are precipitated for treatment; the first electrode group in the electric flocculation device comprises two electrode baskets made of insoluble metal materials, meshes are formed in the electrode baskets, the two electrode baskets can be respectively connected with the positive electrode and the negative electrode of a power supply in a conductive manner, and the electrode baskets are used for placing electrode particles capable of being electrolyzed into electrode ions; wherein: the electrode basket obtains electric energy, and electrode particles are electrolyzed into electrode ions;
the first materialized precipitation clarifying device comprises a first clarifying container and a first dosing device, wherein the first clarifying container is connected with the electric flocculation container, and the first dosing device is connected with the first clarifying container so as to add at least one of flocculating agent and coagulant into the first clarifying container, so that materialized precipitation of the fracturing flowback fluid is clarified;
the electrocatalytic oxidation device comprises a treatment container and an electrocatalytic oxidation device arranged in the treatment container, wherein the treatment container is communicated with the first clarification container, and the electrocatalytic oxidation device generates electrocatalytic oxidation reaction to generate hydroxyl ions, so that the hydroxyl ions destroy and break the macromolecular structure of harmful substances in the fracturing flowback fluid to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize innocuity;
the second chemical precipitation clarifying device comprises a second clarifying container and a second dosing device, wherein the second clarifying container is communicated with the processing container, and the second dosing device is connected with the second clarifying container so as to add at least one of flocculating agent and coagulant into the second clarifying container, so that the fracturing flowback fluid physical precipitation realizes further clarification; and
The sludge filter pressing device comprises a filter press and is used for filter pressing treatment of clarified and precipitated sludge;
the treatment method of the oil-gas field drilling fracturing flowback fluid comprises the following steps:
a step (1) of oil-gas separation, in which oil-water of the fracturing flowback fluid is separated and the separated oil is recovered; in the oil-gas separation step, the fracturing flowback fluid flows into a separation container, micro bubbles generated by an electric floatation device in the separation container lift up to the liquid surface with micro oil strains mixed in the liquid, the oil on the liquid surface is skimmed into an oil guide groove around an opening on the separation container by the micro bubbles for treatment and recovery, and the fracturing flowback fluid from which the oil is separated is pumped and discharged to the next step for treatment;
step (2), regulating the PH value of the fracturing flowback fluid from which the oil is separated;
step (3), the electric flocculation step, namely sending the fracturing flowback fluid with the regulated PH value into an electric flocculation container, wherein a first electrode group is arranged in the electric flocculation container, the first electrode group obtains electric energy, hydroxide ions are electrolyzed and separated out from the liquid, electrode ions are obtained, so that the fracturing flowback fluid generates degradation oxidation reaction, the hydroxide ions and the electrode ions are combined into flocculating agent, the flocculating agent and the fracturing flowback fluid generate flocculation reaction to flocculate harmful substances in the fracturing flowback fluid, and then the harmful substances are precipitated for treatment;
a step (4) of primary materialized precipitation clarification, in which at least one of flocculating agent and coagulant is added into the fracturing flowback fluid after the electric flocculation step, so that the materialized precipitation of the fracturing flowback fluid is clarified;
step (5), an electrocatalytic oxidation step is carried out to generate hydroxyl ions, wherein the hydroxyl ions destroy and break the macromolecular structure of harmful substances in the fracturing flowback fluid to degrade the harmful substances into small molecules, and the small molecular harmful substances are degraded into oxides to realize innocuity;
step (6), a secondary materialized precipitation clarification step, namely adding at least one of flocculant and coagulant into the fracturing flowback fluid subjected to the electrocatalytic oxidation sewage step to realize further clarification of the materialized precipitation of the fracturing flowback fluid;
and (7) separating mud from water, separating out precipitated sludge, and performing filter pressing treatment on the sludge.
2. The method for treating the drilling fracturing flow-back fluid of the oil and gas field according to claim 1, wherein the method comprises the following steps of: the electric flocculation device also comprises a third dosing device which is connected with the electric flocculation container to add chemical materials into the electric flocculation container to adjust the PH value of the fracturing flowback fluid.
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| CN110028175B (en) * | 2018-01-12 | 2022-02-01 | 中国石油天然气股份有限公司 | Oil-gas well fracturing flowback fluid treatment method and device and skid-mounted box |
| CN113105097B (en) * | 2020-01-13 | 2023-05-30 | 中国石油天然气集团有限公司 | Harmless treatment method for waste water-based mud |
| CN111573921A (en) * | 2020-06-01 | 2020-08-25 | 中国石油工程建设有限公司 | Method for treating mercury-containing gas field water |
| CN111718049A (en) * | 2020-06-08 | 2020-09-29 | 中国石油集团渤海钻探工程有限公司 | Movable type downhole operation flowback liquid/residual liquid treatment device and construction site treatment method |
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