CN112624480A - System and method for treating oil-containing alcohol-containing produced water in gas field - Google Patents
System and method for treating oil-containing alcohol-containing produced water in gas field Download PDFInfo
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- CN112624480A CN112624480A CN202110004873.XA CN202110004873A CN112624480A CN 112624480 A CN112624480 A CN 112624480A CN 202110004873 A CN202110004873 A CN 202110004873A CN 112624480 A CN112624480 A CN 112624480A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 130
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 37
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 189
- 239000002994 raw material Substances 0.000 claims abstract description 64
- 239000010865 sewage Substances 0.000 claims abstract description 45
- 238000010992 reflux Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 37
- 238000011084 recovery Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- 239000000701 coagulant Substances 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 6
- 125000002091 cationic group Chemical group 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 229940079593 drug Drugs 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- 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
Abstract
The invention relates to a system and a method for treating oil-containing alcohol-containing produced water in a gas field, wherein the system comprises: the system comprises a regulating tank, a pressure type oil remover, a reactor, a raw material water tank, an unloading pool, a coarse filter, a raw material heat exchanger, a rectifying tower, an evaporative condenser, a reflux tank, a methanol tank and a reboiler; the unloading pool is sequentially connected with the regulating tank, the pressure type oil remover, the reactor and the raw material water tank to form a pretreatment unit; the water outlet of the raw material water tank is connected with the coarse filter and the raw material heat exchanger to form a preheating unit; the water outlet of the raw material heat exchanger is sequentially connected with the rectifying tower and the reboiler to form a rectifying and separating unit; the water outlet of the reboiler is connected with a condensed water recoverer. Methanol can be recycled in the gas field development process, the production cost is saved while the environmental pollution is reduced, and the produced water of the gas field is effectively treated to ensure that the quality of reinjection stratum sewage reaches the standard. Has the advantages of simple treatment method, simple and convenient operation, low treatment cost and high treatment efficiency.
Description
Technical Field
The invention relates to a system and a method for treating oil-containing alcohol-containing produced water in a gas field, and belongs to the field of gas field development energy conservation and environmental protection.
Background
The elm gas field is prepared by low-temperature separation process to inhibit the generation of natural gas hydrate during the exploitation of natural gasIt is often necessary to inject large quantities of methanol into gas wells and gas production lines to prevent plugging by hydrate formation. Therefore, the sewage produced by the elm gas field contains a large amount of methanol, the average methanol content in the sewage is 47%, when the amount of methanol injected into the gas well in winter is large, the methanol content in the sewage can reach 63%, and the methanol is volatile and highly toxic. Simultaneously, sewage absorbs CO in natural gas2The components are acidic and contain a large amount of condensate oil, minerals, suspended matters, mechanical impurities and the like. From the aspects of environmental protection, economy and the like, the oily and alcoholic sewage produced in the natural gas exploitation process must be comprehensively treated to protect the environment. Therefore, the comprehensive treatment and utilization of the produced water of the elm forest gas field are needed.
Disclosure of Invention
The invention aims to provide a system and a method for treating oil-containing alcohol-containing produced water in a gas field, which can recycle methanol in the gas field development process, reduce environmental pollution, save production cost and effectively treat the produced water in the gas field to ensure that the quality of reinjection stratum sewage reaches the standard. In particular to a method for treating oil-containing alcohol-containing produced water in the gas field development process.
The purpose of the invention is realized by the following technical scheme:
a gas field oil-containing alcohol-containing produced water treatment system comprising: the system comprises a regulating tank, a pressure type oil remover, a reactor, a raw material water tank, an unloading pool, a coarse filter, a raw material heat exchanger, a rectifying tower, an evaporative condenser, a reflux tank, a methanol tank and a reboiler;
the unloading pool is sequentially connected with the regulating tank, the pressure type oil remover, the reactor and the raw material water tank to form a pretreatment unit; the water outlet of the raw material water tank is connected with the coarse filter and the raw material heat exchanger to form a preheating unit;
the water outlet of the raw material heat exchanger is sequentially connected with the rectifying tower and the reboiler to form a rectifying and separating unit; the water outlet of the reboiler is connected with a condensed water recoverer.
As a further refinement of the present invention, the feed heat exchanger comprises a first feed heat exchanger and a second feed heat exchanger; the coarse filter is connected with a water inlet of the first raw material heat exchanger, a water outlet of the first raw material heat exchanger is connected with a water inlet of the second raw material heat exchanger, and a water outlet of the second raw material heat exchanger is connected with the rectifying tower;
the hot water inlet of the first raw material heat exchanger is connected with the hot water outlet of the rectifying tower, the hot water outlet of the first raw material heat exchanger is connected with the reinjection tank, the steam inlet of the second raw material heat exchanger is connected with the boiler steam pipe, and the steam outlet of the second raw material heat exchanger is connected with the condensed water recoverer.
As a further improvement of the invention, a gas outlet of the rectifying tower is sequentially connected with an evaporative condenser, a reflux tank and a methanol tank to form a methanol recovery unit.
As a further improvement of the invention, a liquid outlet of the rectifying tower is connected with a liquid inlet of a reboiler, and a liquid outlet of the reboiler is connected with a condensed water recoverer; the steam inlet of the reboiler is connected with the boiler steam pipe, and the steam outlet of the reboiler is connected with the steam inlet of the rectifying tower.
As a further improvement of the invention, an oil outlet of the unloading pool is sequentially connected with the underground tank and the condensate tank to form a condensate recovery unit; the oil outlets of the regulating tank and the pressure type oil remover are connected with the buried tank.
A treatment method of a gas field oil-containing alcohol-containing produced water treatment system comprises the following steps:
firstly, deoiling produced water in a gas field development process, pretreating alcohol-containing sewage after deoiling, sending feed liquid after mechanical impurities and oil content are removed into a methanol recovery device through a feeding pump for rectification and separation, and producing a tower top product methanol, tower bottom sewage and rectification water after treatment by a constant pressure rectification process; transferring the product methanol to a methanol tank through a methanol pump for recycling, transferring the tower bottom water to a reinjection tank through a waste liquid pump, and reinjecting the water injection well reservoir; the rectified water enters a condensate water recoverer.
As a further improvement of the invention, the pretreatment process of the alcohol-containing sewage specifically comprises the following steps:
transporting the oil-containing and alcohol-containing produced water to a treatment plant unloading pool from a gas gathering station, transferring the oil-containing and alcohol-containing produced water to a raw material water tank by a sewage lifting pump, standing, removing oil, transferring water, heating the raw material water to 20-30 ℃ by a steam-water mixed heater during water transferring, and injecting the raw material water into a pressure type oil remover for secondary oil removal;
the deoiled alcohol-containing sewage and the medicine enter a reaction tank through a pipeline mixer to be fully mixed, then the coagulant aid is added, so that mechanical impurities in the alcohol-containing sewage generate thick, solid and easily-settled floccules, and the alcohol-containing sewage and the added medicine enter a raw material water tank for flocculation and settlement after reaction.
As a further improvement of the invention, the medicine comprises pH value regulator sodium hydroxide, coagulant polymeric basic aluminum chloride and hydrogen peroxide; the coagulant aid is cationic polyacrylamide.
As a further improvement of the present invention, the rectification separation process specifically comprises:
sending the alcohol-containing sewage from which the mechanical impurities and the oil are removed into a methanol recovery device through a feeding pump for rectification separation, wherein the concentration of methanol of a product at the top of the tower is more than or equal to 95 percent and the content of methanol of the sewage at the bottom of the tower is less than or equal to 0.1 percent after the treatment of a normal pressure rectification process; transferring the product methanol to a methanol tank through a methanol pump for recycling;
and after the industrial sewage produced at the tower bottom reaches the standard, the industrial sewage is pressurized and reinjected to a reservoir of the water injection well through a reinjection pump.
Compared with the prior art, the invention has the following advantages:
the method can effectively separate the condensate oil from the oil-bearing alcohol-containing produced water in the gas field. The deoiled alcohol-containing sewage is rectified under normal pressure by a methanol recovery device, the concentration of the product methanol is more than or equal to 95 percent, and the product methanol can be recycled. The methanol content of the water at the bottom of the tower treated by the methanol recovery device is less than or equal to 0.1 percent, and the water is pressurized and reinjected into a reservoir of a water injection well, so that the environment is not polluted.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case. In the drawings:
FIG. 1 is a diagram of a sewage treatment system;
FIG. 2 is a diagram of a sewage pretreatment system;
fig. 3 is a flow chart of a sewage pretreatment process.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The following detailed description of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited to the embodiments. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention.
According to the attached drawing 1, the treatment system for the oil-containing alcohol-containing produced water of the gas field comprises an unloading pool 5, a regulating tank 1, a pressure type oil remover 2, a reactor 3, a raw material water tank 4, the unloading pool 5, a buried tank 6, a condensate oil tank 7, a coarse filter 8, a raw material heat exchanger 9, a rectifying tower 14, an evaporative condenser 15, a reflux tank 16, a methanol tank 17, a reboiler 20 and a reinjection tank 21.
The unloading pool 5 is sequentially connected with the adjusting tank 1, the pressure type oil remover 2, the reactor 3 and the raw material water tank 4 to form a pretreatment unit;
the water outlet of the raw material water tank 4 is connected with a coarse filter 8 and a raw material heat exchanger 9 to form a preheating unit;
the water outlet of the raw material heat exchanger 9 is sequentially connected with a rectifying tower 14, an evaporative condenser 15, a reflux tank 16 and a methanol tank 17 to form a methanol recovery unit;
the water outlet of the raw material heat exchanger 9 is sequentially connected with the rectifying tower 14 and the reboiler 20 to form a rectifying and separating unit; the water outlet of the reboiler 20 is connected with a condensed water recoverer.
The unloading pool 5 is sequentially connected with a buried tank 6 and a condensate tank 7 to form a condensate recovery unit.
The raw material heat exchanger comprises a first raw material heat exchanger 9 and a second raw material heat exchanger 11; the coarse filter 8 is connected with a water inlet of a first raw material heat exchanger 9, a water outlet of the first raw material heat exchanger 9 is connected with a water inlet of a second raw material heat exchanger 11, and a water outlet of the second raw material heat exchanger 11 is connected with a rectifying tower 14;
a hot water inlet of the first raw material heat exchanger 9 is connected with a hot water outlet of the rectifying tower 14, a hot water outlet of the first raw material heat exchanger 9 is connected with the reinjection tank 21, a steam inlet of the second raw material heat exchanger 11 is connected with a boiler steam pipe, and a steam outlet of the second raw material heat exchanger 11 is connected with the condensed water recoverer.
The gas outlet of the rectifying tower 14 is connected with an evaporative condenser 15, a reflux tank 16 and a methanol tank 17 in sequence to form a methanol recovery unit.
A liquid outlet of the rectifying tower 14 is connected with a liquid inlet of a reboiler 20, and a liquid outlet of the reboiler 20 is connected with a condensed water recoverer; the steam inlet of the reboiler 20 is connected to the boiler steam pipe, and the steam outlet of the reboiler 20 is connected to the steam inlet of the rectifying tower 14.
An oil outlet of the unloading pool 5 is sequentially connected with a buried tank 6 and a condensate tank 7 to form a condensate recovery unit; oil outlets of the adjusting tank 1 and the pressure type oil remover 2 are connected with an underground tank 6.
According to the illustration in fig. 3, the invention is implemented by the following steps:
the method comprises the steps of removing oil from produced water in the gas field development process, pretreating alcohol-containing sewage after oil removal to remove mechanical impurities and oil, sending the feed liquid into a methanol recovery device through a feeding pump for rectification and separation, and producing a product methanol concentration at the top of a tower which is not less than 95% and a product methanol content at the bottom of the tower which is not more than 0.1% after treatment of a normal pressure rectification process. And transferring the product methanol to a methanol tank through a methanol pump for recycling, transferring the tower bottom water to a reinjection tank through a waste liquid pump, and reinjecting the water injection well reservoir.
The method specifically comprises the following steps:
1. and (2) transporting the produced water containing oil and alcohol to an unloading pool of a treatment plant from a gas gathering station, transferring the produced water to No. 3 and No. 4 raw material water tanks by a sewage lifting pump, standing for 24 hours, removing oil and transferring the produced water, heating the raw material water to 20-30 ℃ by using a steam-water mixed heater during water transferring, and injecting the raw material water into a pressure type oil remover for secondary oil removal. The deoiled alcohol-containing sewage and medicines (pH value regulator (sodium hydroxide), coagulant (polymeric basic aluminum chloride) and hydrogen peroxide) enter a reaction tank through a pipeline mixer to be fully mixed, then coagulant aid (cationic polyacrylamide) is added to enable mechanical impurities in the alcohol-containing sewage to generate thick, firm and easily-settled floccules, and the alcohol-containing sewage and the added medicines enter a No. 1 and No. 2 raw material water tank to be subjected to flocculation settling for 12 hours after reaction;
2. the alcohol-containing sewage from which the mechanical impurities and the oil are removed is sent to a methanol recovery device through a feeding pump for rectification separation, and the methanol concentration of the product at the top of the tower is more than or equal to 95 percent and the methanol content of the sewage at the bottom of the tower is less than or equal to 0.1 percent after the treatment of the atmospheric pressure rectification process. The product methanol is transferred to a methanol tank for recycling through a methanol pump.
3. And after the industrial sewage produced at the tower bottom reaches the standard, the industrial sewage is pressurized and reinjected to a reservoir of the water injection well through a reinjection pump.
In conclusion, the invention relates to a method for treating oil-containing alcohol-containing produced water in the gas field development process. The method can effectively recycle the produced water containing oil and alcohol in the gas field development process, the separated condensate oil can be reprocessed and utilized, the deoiled alcohol-containing sewage is added with a pH value regulator (sodium hydroxide), a coagulant (polymeric basic aluminum chloride), hydrogen peroxide and a coagulant aid (cationic polyacrylamide), so that mechanical impurities in the oil-containing alcohol-containing sewage can generate thick, firm and easily-settled floccules, the feed liquid after the mechanical impurities and oil are removed is sent to a methanol recovery device through a feeding pump for rectification and separation, the sewage treated by the normal pressure rectification process is designed to have a methanol concentration of more than or equal to 95 percent, can be recycled after entering a methanol tank, has a methanol content of water at the bottom of the tower of less than or equal to 0.1 percent and meets the environmental protection requirement, and enters a reinjection tank and is injected back to a reservoir of a water injection well under pressure through the reinjection pump. Has the advantages of simple treatment method, simple and convenient operation, low treatment cost and high treatment efficiency.
It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicant consider that such subject matter is not considered part of the disclosed subject matter.
Claims (9)
1. A gas field oil-containing alcohol-containing produced water treatment system is characterized by comprising: the system comprises a regulating tank (1), a pressure type oil remover (2), a reactor (3), a raw material water tank (4), an unloading pool (5), a coarse filter (8), a raw material heat exchanger, a rectifying tower (14), an evaporative condenser (15), a reflux tank (16), a methanol tank (17) and a reboiler (20);
the unloading pool (5) is sequentially connected with the adjusting tank (1), the pressure type oil remover (2), the reactor (3) and the raw material water tank (4) to form a pretreatment unit; the water outlet of the raw material water tank (4) is connected with the coarse filter (8) and the raw material heat exchanger to form a preheating unit;
the water outlet of the raw material heat exchanger is sequentially connected with a rectifying tower (14) and a reboiler (20) to form a rectifying and separating unit; the water outlet of the reboiler (20) is connected with a condensed water recoverer.
2. A gas field oil-containing alcohol-containing produced water treatment system according to claim 1, wherein the feedstock heat exchanger comprises a first feedstock heat exchanger (9) and a second feedstock heat exchanger (11); the coarse filter (8) is connected with a water inlet of the first raw material heat exchanger (9), a water outlet of the first raw material heat exchanger (9) is connected with a water inlet of the second raw material heat exchanger (11), and a water outlet of the second raw material heat exchanger (11) is connected with the rectifying tower (14);
a hot water inlet of the first raw material heat exchanger (9) is connected with a hot water outlet of the rectifying tower (14), a hot water outlet of the first raw material heat exchanger (9) is connected with a reinjection tank (21), a steam inlet of the second raw material heat exchanger (11) is connected with a boiler steam pipe, and a steam outlet of the second raw material heat exchanger (11) is connected with a condensed water recoverer.
3. The system for treating the produced water containing oil and alcohol in the gas field according to claim 1, wherein a gas outlet of the rectifying tower (14) is connected with an evaporative condenser (15), a reflux tank (16) and a methanol tank (17) in sequence to form a methanol recovery unit.
4. The system for treating the produced water containing oil and alcohol in the gas field according to claim 1, wherein the liquid outlet of the rectifying tower (14) is connected with the liquid inlet of a reboiler (20), and the liquid outlet of the reboiler (20) is connected with a condensed water recoverer; the steam inlet of the reboiler (20) is connected with a boiler steam pipe, and the steam outlet of the reboiler (20) is connected with the steam inlet of the rectifying tower (14).
5. The system for treating the oil-containing and alcohol-containing produced water in the gas field according to claim 1, wherein an oil outlet of the unloading pool (5) is sequentially connected with a buried tank (6) and a condensate tank (7) to form a condensate recovery unit; oil outlets of the adjusting tank (1) and the pressure type oil remover (2) are connected with the buried tank (6).
6. The treatment method of the treatment system for the produced water containing oil and alcohol in the gas field of claim 1, which is characterized by comprising the following steps:
firstly, deoiling produced water in a gas field development process, pretreating alcohol-containing sewage after deoiling, sending feed liquid after mechanical impurities and oil content are removed into a methanol recovery device through a feeding pump for rectification and separation, and producing a tower top product methanol, tower bottom sewage and rectification water after treatment by a constant pressure rectification process; transferring the product methanol to a methanol tank through a methanol pump for recycling, transferring the tower bottom water to a reinjection tank through a waste liquid pump, and reinjecting the water injection well reservoir; the rectified water enters a condensate water recoverer.
7. The treatment method of the treatment system for the oil-containing alcohol-containing produced water of the gas field according to claim 6, wherein the pretreatment process of the alcohol-containing sewage specifically comprises:
transporting the oil-containing and alcohol-containing produced water to a treatment plant unloading pool from a gas gathering station, transferring the oil-containing and alcohol-containing produced water to a raw material water tank by a sewage lifting pump, standing, removing oil, transferring water, heating the raw material water to 20-30 ℃ by a steam-water mixed heater during water transferring, and injecting the raw material water into a pressure type oil remover for secondary oil removal;
the deoiled alcohol-containing sewage and the medicine enter a reaction tank through a pipeline mixer to be fully mixed, then a coagulant aid is added to enable mechanical impurities in the alcohol-containing sewage to generate floccules, and the alcohol-containing sewage and the added medicine enter a raw material water tank to be flocculated and settled after reaction.
8. The treatment method of the gas field oil-and alcohol-containing produced water treatment system according to claim 7, wherein the drugs comprise pH value regulator sodium hydroxide, coagulant polymeric basic aluminum chloride and hydrogen peroxide; the coagulant aid is cationic polyacrylamide.
9. The treatment method of the gas field oil-containing alcohol-containing produced water treatment system according to claim 6, wherein the rectification separation process specifically comprises:
sending the alcohol-containing sewage from which the mechanical impurities and the oil content are removed into a methanol recovery device through a feeding pump for rectification and separation; the concentration of methanol produced at the top of the tower after the treatment of the atmospheric pressure rectification process is more than or equal to 95 percent, and the content of methanol in the sewage at the bottom of the tower is less than or equal to 0.1 percent; transferring the product methanol to a methanol tank through a methanol pump for recycling;
and after the industrial sewage produced at the tower bottom reaches the standard, the industrial sewage is pressurized and reinjected to a reservoir of the water injection well through a reinjection pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110004873.XA CN112624480A (en) | 2021-01-04 | 2021-01-04 | System and method for treating oil-containing alcohol-containing produced water in gas field |
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| CN202110004873.XA CN112624480A (en) | 2021-01-04 | 2021-01-04 | System and method for treating oil-containing alcohol-containing produced water in gas field |
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| CN (1) | CN112624480A (en) |
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