CN110127900B - Device and method for treating produced water of premixed scaling oil field - Google Patents
Device and method for treating produced water of premixed scaling oil field Download PDFInfo
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- CN110127900B CN110127900B CN201910454971.6A CN201910454971A CN110127900B CN 110127900 B CN110127900 B CN 110127900B CN 201910454971 A CN201910454971 A CN 201910454971A CN 110127900 B CN110127900 B CN 110127900B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 333
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 61
- 238000004062 sedimentation Methods 0.000 claims abstract description 61
- 238000001914 filtration Methods 0.000 claims abstract description 34
- 238000005189 flocculation Methods 0.000 claims abstract description 30
- 230000016615 flocculation Effects 0.000 claims abstract description 30
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000003814 drug Substances 0.000 claims abstract description 10
- 230000015271 coagulation Effects 0.000 claims abstract description 9
- 238000005345 coagulation Methods 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 46
- 238000006243 chemical reaction Methods 0.000 claims description 39
- 150000002500 ions Chemical class 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 12
- 238000011001 backwashing Methods 0.000 claims description 9
- 150000001768 cations Chemical class 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 230000007935 neutral effect Effects 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical group [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 229940079593 drug Drugs 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 8
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 150000001450 anions Chemical class 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
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- 239000000243 solution Substances 0.000 description 3
- 230000001112 coagulating effect Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- 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
- C02F1/52—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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to the technical field of multi-layer system water injection development of oil fields, and particularly relates to a device and a method for treating produced water of a premixed scale-forming oil field. The invention effectively modifies the water quality through five steps of pre-scaling, coagulation sedimentation treatment, pH value adjustment of mixed produced water and filtration of the produced water by the organic arrangement of the pre-mixing unit, the flocculation sedimentation unit, the adjusting unit, the filtering unit and the clear water unit and by the determined proper mixing proportion and mixing of two incompatible produced water. The invention simplifies the treatment flow and greatly reduces the dosage of the medicament and the treatment cost in the chemical treatment process; the integrated device is prefabricated in a modularized mode, can be assembled according to modules according to actual conditions on site, is flexible in construction and saves occupied space.
Description
Technical Field
The invention belongs to the technical field of multi-layer system water injection development of oil fields, and particularly relates to a device and a method for treating produced water of a premixed scale-forming oil field.
Background
Under the conditions of energy deficiency and difficult land characterization, the multi-layer system development is gradually popularized for fully exploiting underground resources and improving the crude oil recovery ratio. Because of different properties of the multi-layer developed and exploited crude oil, the water quality of the stratum water is greatly different and the water type is also different. Among the different water types, some water types are rich in calcium, magnesium, strontium and barium scale forming cations, and some water types are rich in heavy carbonate and sulfate scale forming anions; because of the serious incompatibility, the scale is large after mixing, so that pipelines and equipment are blocked and corroded, the formation is blocked due to poor treatment of reinjection stratum, the water injection pressure is increased, and the operation and maintenance cost of oil extraction is increased. In order to avoid the phenomenon, for an oil layer with poor compatibility, a layering treatment and layering reinjection method is mostly adopted at present, so that ground construction sites are more, equipment is more and investment is high.
Disclosure of Invention
The invention provides a device and a method for treating produced water of a premixed scale oilfield, and aims to provide a device and a method for treating produced water of a premixed scale oilfield, which are used for combining different layers of incompatible produced water to reduce engineering investment.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a device for treating the water generated by the oil field with pre-mixed scaling comprises
A pre-mix unit, which is provided with a pre-mix unit,
the flocculation sedimentation unit is connected with the output end of the premixing unit at the input end and is positioned at the upper part of the premixing unit;
the input end of the adjusting unit is connected with the output end of the flocculation sedimentation unit;
the input end of the filtering unit is connected with the output end of the adjusting unit;
the input end of the clear water unit is connected with the output end of the filtering unit;
the control unit is connected with the premixing unit, the flocculation sedimentation unit, the adjusting unit and the clean water unit through wires.
The device also comprises a fixing frame; the flocculation sedimentation unit is connected to the upper surface of the fixing frame on the upper portion of the pre-mixing unit, the section unit is connected to the middle of the fixing frame, the clear water unit is connected to the upper surface of the bottom on the other end of the inner side of the fixing frame, and the filtering unit is connected between the adjusting unit and the clear water unit.
The premixing unit comprises a first water inlet pipe, a second water inlet pipe, a flow controller, a water inlet mixing pipe, a premixing scaling raw water tank, a pre-scaling filter layer and a lifting pump; the first water inlet pipe and the second water inlet pipe penetrate through the side wall of the upper part of the premixed scaling raw water tank in parallel and are connected with a water inlet mixing pipe in the premixed scaling raw water tank; the first water inlet pipe and the second water inlet pipe are respectively connected with a flow controller; the pre-scaling filter layer is at least provided with one layer and is horizontally connected in a pre-scaling raw water tank positioned at the lower part of the water inlet mixing pipe; the input end of the lifting pump is connected to the outer side wall of the pre-mixed scaling raw water tank at the lower part of the pre-scaling filter layer, and the side wall of the bottom of the pre-mixed scaling raw water tank is provided with a first water outlet; the output end of the lifting pump is connected with the input end of the flocculation sedimentation unit; the water inlet mixing pipe is perpendicular to the first water inlet pipe and the second water inlet pipe; the lifting pump is connected with the control unit through wires.
The single layer of the pre-scaling filter layer is provided with an independent frame, and the pre-scaling filter layer is in sealing connection with the tank body of the pre-scaling raw water tank.
The flocculation sedimentation unit comprises a reaction tank, a stirrer, an inclined plate sedimentation tank and a dosing machine; the input end of the reaction tank is connected with the premixing unit; the stirrer is at least provided with one group, and the upper end of the stirrer extends out of the reaction tank and is connected with the upper surface of the reaction tank; the inclined plate sedimentation tank is connected to the upper part of the output end of the reaction tank, and the reaction tank is communicated with the adjusting unit through a pipeline; the chemical adding machine is at least provided with one and is connected to a pipeline connected with the premixing unit and the reaction tank; the bottom of the sedimentation tank is connected with a second water outlet; the stirrer is connected with the control unit through wires.
The reaction tank is internally provided with interception plates in an up-down staggered way; the interception plate divides the reaction tank into a plurality of chambers, and the stirrer and the inclined plate sedimentation tank are respectively arranged in different chambers; the water inlet pipe line of the reaction tank is provided with a first sampling port.
The regulating unit comprises a pH regulating tank, a middle water pump and an online pH detector; the input end of the lower part of the pH adjusting tank is connected with the output end of the flocculation sedimentation unit, the output end of the upper part of the pH adjusting tank is connected with the middle water tank, the inner bottom of the middle water tank is connected with the middle water pump, and the side wall of the bottom of the middle water tank is provided with a water outlet; the output end of the middle water pump is connected with the filtering unit, and a second sampling port is arranged on a pipeline of which the output end is connected with the filtering unit; the pH adjusting tank is higher than the middle water tank; the bottom of the pH adjusting tank is connected with the second water outlet; the online pH detector is connected to the upper surface of the pH adjusting tank, and a probe of the online pH detector extends into the middle water tank; the upper surface of the pH adjusting tank is also connected with a stirrer; the middle water pump, the stirrer and the online pH detector are connected with the control unit through wires.
The filtering unit comprises a primary filter and a secondary filter; the first-stage filter is provided with an input port and three output ports, the input port is connected with the output end of the adjusting unit, and an overrunning bypass pipe is arranged between the input port of the first-stage filter and the clear water unit; the three output ports of the first-stage filter are respectively connected with the second-stage filter, the clear water unit and the second water outlet; the input end of the secondary filter is provided with an input port and two output ports, the input port of the secondary filter is connected with the primary filter, and the two output ports of the secondary filter are respectively connected with the clean water unit and the second water outlet.
The clear water unit comprises a clear water tank and a backwashing water pump; the backwashing water pump is connected to the bottom in the clear water tank; a third water outlet is formed in the side wall of the bottom of the clean water tank; the backwashing water pump is connected with the control unit through a wire.
A method for treating the produced water of a premixed scale-forming oilfield comprises the following steps:
step one: determining the proper mixing proportion
Taking two produced water to be mixed, respectively carrying out water quality ion detection and analysis, simulating water quality scaling tendency, and giving out the maximum scaling quantity of the two water qualities under the mixing condition of different proportions, wherein the ratio of the maximum scaling quantity after mixing is the proper mixing ratio of the two water qualities;
step two: mixing two incompatible produced water pre-fouls
According to the proper mixing proportion determined in the first step, two incompatible produced water are respectively fed into a premixing scaling raw water tank through a first water inlet pipe and a second water inlet pipe of a premixing scaling oilfield produced water treatment device, fully mixed in the premixing scaling raw water tank, and the scaling settlement is maximized through a pre-scaling filter layer arranged in the tank;
step three: coagulation sedimentation treatment
The produced water after full mixing and scaling purification in the second step is lifted by a lifting pump of a pre-mixing scaling oilfield produced water treatment device and enters a reaction tank, the concentration of residual scaling ions in the mixed water is analyzed through water quality detection, then targeted chemical adding and sedimentation are carried out, and when the residual scaling cations are more, medicines such as sodium carbonate, aluminum sulfate and the like are added to promote the sedimentation of the scaling ions such as calcium, magnesium and the like;
step four: pH value adjustment of produced water after mixing
The mixed solution after coagulation sedimentation treatment in the step three enters a pH adjusting tank, and the pH of the mixed solution is adjusted to be neutral to meet the reinjection requirement by adjusting the value measured by an online pH detector and adding a medicament;
step five: produced water filtration
And D, filtering the produced water which is regulated to be neutral in the step four through a middle water pump by a filtering unit, and storing the filtered produced water in a clean water tank for output to finish the whole process of the produced water treatment of the premixed scale oilfield.
The beneficial effects are that:
(1) The invention fully utilizes the characteristic that two types of water-type incompatible produced water respectively contain scale forming anions and cations to carry out water quality modification, and simplifies the treatment flow;
(2) The invention reduces scale-forming ions in the produced water after premixing and precipitation, reduces the treatment difficulty, and greatly reduces the dosage of the medicament and the treatment cost in the chemical treatment process;
(3) The integrated device is prefabricated in a modularized mode, can be assembled according to modules according to actual conditions on site, is flexible in construction and saves occupied space.
The foregoing description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a flow chart of the present invention.
In the figure: 1-a first water inlet pipe; 2-a second water inlet pipe; 3-a flow controller; 4-a water inlet mixing pipe; 5-premixing a scaling raw water tank; 6-pre-scaling the filter layer; 7-a lift pump; 8-a reaction tank; 9-a stirrer; 10-an inclined plate sedimentation tank; 11-a dosing machine; 12-a pH adjusting tank; 13-an intermediate water tank; 14-an intermediate water pump; 15-a primary filter; 16-two-stage filter; 17-a clean water tank; 18-backwashing a water pump; 19-override bypass tube; 20-a control box; 21-a first drain port; 22-a second drain opening; 23-a third drain port; 24-fixing frame; 25-interception plate, 26-first sampling port, 27-on-line pH detector; 28-second sampling port.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
a device for treating produced water of a pre-mixed scaling oilfield in accordance with the illustration of FIG. 1 comprises
A pre-mix unit, which is provided with a pre-mix unit,
the flocculation sedimentation unit is connected with the output end of the premixing unit at the input end and is positioned at the upper part of the premixing unit;
the input end of the adjusting unit is connected with the output end of the flocculation sedimentation unit;
the input end of the filtering unit is connected with the output end of the adjusting unit;
the input end of the clear water unit is connected with the output end of the filtering unit;
the control unit is connected with the premixing unit, the flocculation sedimentation unit, the adjusting unit and the clean water unit through wires.
In actual use, the incompatible produced water of different layers firstly enters the premixing unit, the scale formation of two water qualities is accelerated through the full mixing of the premixing unit, and the scale formation fully removes the scale anions and cations of the produced water of the two layers and then enters the flocculation sedimentation unit; adding chemicals according to the concentration of residual scale forming ions in the mixed water entering the flocculation sedimentation unit, performing coagulation sedimentation treatment, and enabling the treated mixed water supernatant to enter an adjusting unit to adjust the pH value to be neutral, and entering a filtering unit after the pH value meets the water quality re-injection requirement; and after being filtered by the filtering unit, the filtered effluent is stored in the clear water unit and is output outwards at any time.
The pre-mixing unit and the flocculation sedimentation unit adopt an upper layer structure and a lower layer structure, overflow water from the upper layer and the lower layer is fully utilized, the lifting times of water are reduced, the upper layer and the lower layer are determined according to the water treatment amount and the height of the pre-mixing scaling raw water tank, and the occupied area is saved. The control unit in the invention adopts a PLC controller in the prior art or a control circuit in the prior art to realize the start and stop of a stirrer or a water pump in the premixing unit, the flocculation sedimentation unit, the adjusting unit and the clear water unit and the acquisition of the data of the pH value in the adjusting unit.
The invention is suitable for the treatment of produced water in the multi-layer water injection development process, the aim of water quality modification is achieved by premixing and scaling two kinds of produced water with poor compatibility, and when the produced water after scaling ion removal is injected into a stratum for displacement of reservoir oil, in order to avoid blockage of pipelines, equipment and stratum caused by large scaling amount of mixed water, the two kinds of incompatible produced water are utilized to have different scaling anions and cations, the scaling ions in the water are removed to the greatest extent, the stratum is re-injected, the adding amount of a follow-up scale inhibitor is reduced, and the scaling possibility of the reinjection stratum of the produced water is reduced. The invention can combine different layers of incompatible produced water, and reduces engineering investment.
Embodiment two:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the embodiment in that: also includes a mount 24; the pre-mixing unit is connected to the upper surface of the bottom of one end of the inner side of the fixing frame 24, the flocculation sedimentation unit is connected to the upper surface of the fixing frame 24 on the upper portion of the pre-mixing unit, the adjusting unit is connected to the middle of the fixing frame 24, the clear water unit is connected to the upper surface of the bottom of the other end of the inner side of the fixing frame 24, and the filtering unit is connected between the adjusting unit and the clear water unit.
In actual use, the fixing frame 24 integrates the premixing unit, the flocculation sedimentation unit, the adjusting unit, the filtering unit and the clear water unit into a whole, so that the device can be assembled on site, and the occupied area is saved.
Embodiment III:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the embodiment in that: the premixing unit comprises a first water inlet pipe 1, a second water inlet pipe 2, a flow controller 3, a water inlet mixing pipe 4, a premixing scaling raw water tank 5, a pre-scaling filter layer 6 and a lifting pump 7; the first water inlet pipe 1 and the second water inlet pipe 2 penetrate through the side wall of the upper part of the premixed scaling raw water tank 5 and are connected with the water inlet mixing pipe 4 in the premixed scaling raw water tank 5; the first water inlet pipe 1 and the second water inlet pipe 2 are respectively connected with a flow controller 3; the pre-scaling filter layer 6 is at least provided with one layer and is horizontally connected in a pre-scaling raw water tank 5 positioned at the lower part of the water inlet mixing pipe 4; the input end of the lifting pump 7 is connected to the outer side wall of the premixed scaling raw water tank 5 at the lower part of the pre-scaling filter layer 6, and a first water outlet 21 is formed in the side wall of the bottom of the premixed scaling raw water tank 5; the output end of the lifting pump 7 is connected with the input end of the flocculation sedimentation unit; the lift pump 7 is connected with a control unit by electric wires.
In actual use, two incompatible produced water flows into a premixing scaling raw water tank 5 through a water inlet pipe I1 and a water inlet pipe II 2 and a water inlet mixing pipe 4; the produced water in the first water inlet pipe 1 enters the second water inlet pipe 2 after passing through the vertically arranged mixing pipe 4, and two water flows are mixed in the vertical direction to form turbulence, so that the water quality mixing effect is enhanced. The produced water entering the water premixing scaling raw water tank 5 is subjected to test to determine the proper mixing ratio of the two water qualities, and the flow controller 3 is used for adjusting the flow of the water entering, so that the two water qualities are scaled to the greatest extent under the proper ratio, and scaling ions in the mixed water are reduced.
Embodiment four:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the third embodiment in that: the single layer of the pre-scaling filter layer 6 is provided with an independent frame, and the pre-scaling filter layer 6 is in sealing connection with the tank body of the pre-scaling raw water tank 5.
When in actual use, the pre-scaling filter layer 6 is of a net structure, is arranged in two or more layers according to actual needs, is provided with an independent frame, is in sealing connection with the tank body, and can be freely detached for periodic replacement. The filter layer attached with the scale body can be processed and recycled according to the scale property.
Fifth embodiment:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the embodiment in that: the flocculation sedimentation unit comprises a reaction tank 8, a stirrer 9, an inclined plate sedimentation tank 10 and a dosing machine 11; the input end of the reaction tank 8 is connected with the premixing unit; at least one group of stirrers 9 are arranged, and the upper ends of the stirrers 9 extend out of the reaction tank 8 and are connected with the upper surface of the reaction tank 8; the inclined plate sedimentation tank 10 is connected to the upper part of the output end of the reaction tank 8, and the reaction tank 8 is communicated with the regulating unit through a pipeline; the chemical adding machine 11 is at least provided with one and is connected to a pipeline connected with the premixing unit and the reaction tank 8; the bottom of the sedimentation tank 10 is connected with a second water outlet 22; the stirrer 9 is connected with the control unit through wires.
Preferably, the reaction tank 8 is internally provided with interception plates 25 in a staggered way up and down; the interception plate 25 divides the reaction tank 8 into a plurality of chambers, and the stirrer 9 and the inclined plate sedimentation tank 10 are respectively arranged in different chambers; the reaction tank water inlet pipe is provided with a first sampling port 26.
When in actual use, when certain scale-forming cations still remain in the effluent of the premixing unit, an coagulating sedimentation process is adopted, and an oxidant, a flocculating agent and a coagulant aid are added according to the reaction sequence, so that the ions are removed in a targeted manner, and the water quality is purified. The reagent respectively enters a first-stage reaction tank and a second-stage reaction tank according to the reaction time sequence, a mechanical stirrer is arranged in the tanks, residual scale-forming cations are removed in a targeted manner, and supernatant liquid after being precipitated in the inclined plate precipitation tank 10 enters a next-stage regulating unit. The technical scheme that the interception plates 25 are arranged in the reaction tank 8 in a vertically staggered way ensures that the flocculation sedimentation effect is better. The scale-forming ions in the effluent after passing through the flocculation sedimentation unit are greatly reduced, the quality of the injected water is improved, and the dosage of chemical agents is reduced. A first sampling port 26 is arranged on the water inlet pipe line of the reaction tank, so that water quality detection sampling is convenient.
Example six:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the embodiment in that: the regulating unit comprises a pH regulating tank 12, an intermediate water tank 13, an intermediate water pump 14 and an online pH detector 27; the input end of the lower part of the pH adjusting tank 12 is connected with the output end of the flocculation sedimentation unit, the output end of the upper part of the pH adjusting tank 12 is connected with the middle water tank 13, the middle water pump 14 is connected at the inner bottom of the middle water tank 13, and the side wall of the bottom of the middle water tank 13 is provided with a water outlet; the output end of the intermediate water pump 14 is connected with the filtering unit, and a second sampling port 28 is arranged on a pipeline of which the output end of the intermediate water pump 14 is connected with the filtering unit; the pH adjusting tank 12 is arranged higher than the middle water tank 13; the bottom of the pH adjusting tank 12 is connected with a second water outlet 22; the online pH detector 27 is connected to the upper surface of the pH adjusting tank 12, and a probe of the online pH detector 27 extends into the intermediate water tank 13; the upper surface of the pH adjusting tank 12 is also connected with a stirrer; the intermediate water pump 14, stirrer and online pH detector 27 are wired to a control unit.
In actual use, the medium enters the pH adjusting tank to be provided with an online pH detector 27, corresponding medicaments are added according to the pH condition of the medium in the pH adjusting tank 12, and the medium in the pH adjusting tank 12 is adjusted to meet the requirement of reinjection water quality. The pH adjusting tank 12 and the middle water tank 13 adopt an upper layer structure and a lower layer structure, overflow water from the upper layer and the lower layer is fully utilized, the lifting times of water are reduced, and the upper layer and the lower layer are determined according to the water treatment amount and the actual conditions. The provision of the second sampling port 28 facilitates water quality testing sampling.
Embodiment seven:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the embodiment in that: the filtering unit comprises a primary filter 15 and a secondary filter 16; the primary filter 15 is provided with an input port and three output ports, the input port is connected with the output end of the adjusting unit, and an overrunning bypass pipe 19 is arranged between the input port of the primary filter 15 and the clear water unit; the three output ports of the primary filter 15 are respectively connected with the secondary filter 16, the clean water unit and the second water outlet 22; the input end of the secondary filter 16 is provided with an input port and two output ports, the input port of the secondary filter 16 is connected with the primary filter 15, and the two output ports of the secondary filter 16 are respectively connected with the clean water unit and the second water outlet 22.
In actual use, the primary filter 15 and the secondary filter 16 are operated in series, and after two-stage filtration, clear filtered water scale forming ions are greatly reduced, so that the quality of water injection is improved.
Example eight:
the device for treating the produced water of the premixed scale-forming oilfield shown in fig. 1 is different from the embodiment in that: the clear water unit comprises a clear water tank 17 and a backwashing water pump 18; the backwashing water pump 18 is connected to the bottom in the clean water tank 17; a third water outlet 23 is arranged on the side wall of the bottom of the clean water tank 17; the backwash water pump 18 is connected with the control unit through wires.
In actual use, the backwash water pump 18 can automatically backwash the operation pressure when needed, so as to ensure the good operation state of the equipment.
Example nine:
according to the method for treating the produced water of the premixed scale-forming oilfield, shown in fig. 2, the method comprises the following steps:
step one: determining the proper mixing proportion
Taking two produced water to be mixed, respectively carrying out water quality ion detection and analysis, simulating water quality scaling tendency, and giving out the maximum scaling quantity of the two water qualities under the mixing condition of different proportions, wherein the ratio of the maximum scaling quantity after mixing is the proper mixing ratio of the two water qualities;
step two: mixing two incompatible produced water pre-fouls
According to the proper mixing proportion determined in the first step, two incompatible produced water are respectively fed into a premixed scaling raw water tank 4 through a first water inlet pipe 1 and a second water inlet pipe 2 of a premixed scaling oilfield produced water treatment device, fully mixed in the premixed scaling raw water tank 4, and the scaling sedimentation is maximized through a pre-scaling filter layer 6 arranged in the tank;
step three: coagulation sedimentation treatment
The produced water after full mixing and scaling purification in the second step is lifted by a lifting pump 7 of a pre-mixing scaling oilfield produced water treatment device and enters a reaction tank 8, the concentration of residual scaling ions in the mixed water is analyzed through water quality detection, then targeted chemical adding and sedimentation are carried out, and when the residual scaling cations are more, medicines such as sodium carbonate, aluminum sulfate and the like are added to promote the sedimentation of the scaling ions such as calcium, magnesium and the like;
step four: pH value adjustment of produced water after mixing
The mixed solution after coagulation sedimentation treatment in the third step enters a pH adjusting tank 12, and the pH of the mixed solution is adjusted to be neutral to meet the reinjection requirement by adjusting the value measured by an online pH detector and adding a medicament;
step five: produced water filtration
And D, filtering the produced water which is regulated to be neutral in the step four by a middle water pump 14 through a filtering unit, and storing the filtered produced water in a clean water tank 17 for external transmission to finish the whole process of the produced water treatment of the premixed scale-forming oil field.
When the method is actually used, firstly, when the proper mixing proportion is determined, two produced water to be mixed are taken, water quality ion detection and analysis are respectively carried out by adopting the prior art, the scaling analysis software of the prior art simulates the scaling trend of water quality, and the maximum scaling quantity of the two water qualities under the condition of mixing in different proportions is given out, namely the proper mixing proportion of the two water qualities is the maximum scaling quantity after mixing; the water quality detection analysis in the coagulation sedimentation treatment in the step three is also performed by adopting the prior art; the invention effectively carries out the modification of the water quality by determining the proper mixing proportion, mixing two incompatible produced water for scaling, coagulating sedimentation treatment, regulating the pH value of the mixed produced water and filtering the produced water. The invention simplifies the treatment flow and greatly reduces the dosage of the medicament and the treatment cost in the chemical treatment process; the integrated device is prefabricated in a modularized mode, can be assembled according to modules according to actual conditions on site, is flexible in construction and saves occupied space.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Under the condition of no conflict, the technical features related to the examples can be combined with each other according to actual situations by a person skilled in the art so as to achieve corresponding technical effects, and specific details of the combination situations are not described in detail herein.
While the invention is susceptible of embodiments in accordance with the preferred embodiments, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. A premixing scaling oilfield produced water treatment device is characterized in that: comprising
A pre-mix unit, which is provided with a pre-mix unit,
the flocculation sedimentation unit is connected with the output end of the premixing unit at the input end and is positioned at the upper part of the premixing unit;
the input end of the adjusting unit is connected with the output end of the flocculation sedimentation unit;
the input end of the filtering unit is connected with the output end of the adjusting unit;
the input end of the clear water unit is connected with the output end of the filtering unit;
the control unit is connected with the premixing unit, the flocculation sedimentation unit, the adjusting unit and the clear water unit through wires;
the premixing unit comprises a first water inlet pipe (1), a second water inlet pipe (2), a flow controller (3), a water inlet mixing pipe (4), a premixing scaling raw water tank (5), a pre-scaling filter layer (6) and a lifting pump (7); the first water inlet pipe (1) and the second water inlet pipe (2) penetrate through the side wall of the upper part of the premixed scaling raw water tank (5) in parallel and are connected with the water inlet mixing pipe (4) in the premixed scaling raw water tank (5); the first water inlet pipe (1) and the second water inlet pipe (2) are respectively connected with a flow controller (3); the pre-scaling filter layer (6) is at least provided with one layer and is horizontally connected in a pre-scaling raw water tank (5) positioned at the lower part of the water inlet mixing pipe (4); the input end of the lifting pump (7) is connected to the outer side wall of the pre-mixing scaling raw water tank (5) at the lower part of the pre-scaling filter layer (6), and a first water outlet (21) is formed in the side wall of the bottom of the pre-mixing scaling raw water tank (5); the output end of the lifting pump (7) is connected with the input end of the flocculation sedimentation unit; the water inlet mixing pipe (4) is perpendicular to the first water inlet pipe (1) and the second water inlet pipe (2); the lifting pump (7) is connected with the control unit through wires;
the flocculation sedimentation unit comprises a reaction tank (8), a stirrer (9), an inclined plate sedimentation tank (10) and a dosing machine (11); the input end of the reaction tank (8) is connected with the premixing unit; the stirrer (9) is at least provided with one group, and the upper end of the stirrer (9) extends out of the reaction tank (8) and is connected with the upper surface of the reaction tank (8); the inclined plate sedimentation tank (10) is connected to the upper part of the output end of the reaction tank (8), and the reaction tank (8) is communicated with the regulating unit through a pipeline; the chemical adding machine (11) is at least provided with one pipeline which is connected with the premixing unit and the reaction tank (8); the bottom of the sedimentation tank (10) is connected with a second water outlet (22); the stirrer (9) is connected with the control unit through wires;
the regulating unit comprises a pH regulating tank (12), an intermediate water tank (13), an intermediate water pump (14) and an online pH detector (27); the input end of the lower part of the pH adjusting tank (12) is connected with the output end of the flocculation sedimentation unit, the output end of the upper part of the pH adjusting tank (12) is connected with the middle water tank (13), the middle water pump (14) is connected to the inner bottom of the middle water tank (13), and the side wall of the bottom of the middle water tank (13) is provided with a water outlet; the output end of the intermediate water pump (14) is connected with the filtering unit, and a second sampling port (28) is arranged on a pipeline of which the output end of the intermediate water pump (14) is connected with the filtering unit; the pH adjusting tank (12) is higher than the middle water tank (13); the bottom of the pH adjusting tank (12) is connected with a second water outlet (22); the online pH detector (27) is connected to the upper surface of the pH adjusting tank (12), and a probe of the online pH detector (27) extends into the middle water tank (13); the upper surface of the pH adjusting tank (12) is also connected with a stirrer; the middle water pump (14), the stirrer and the online pH detector (27) are connected with a control unit through wires;
the filtering unit comprises a primary filter (15) and a secondary filter (16); the primary filter (15) is provided with an input port and three output ports, the input port is connected with the output end of the adjusting unit, and an overrunning bypass pipe (19) is arranged between the input port of the primary filter (15) and the clear water unit; three output ports of the primary filter (15) are respectively connected with the secondary filter (16), the clear water unit and the second water outlet (22); the input end of the secondary filter (16) is provided with an input port and two output ports, the input port of the secondary filter (16) is connected with the primary filter (15), and the two output ports of the secondary filter (16) are respectively connected with the clear water unit and the second water outlet (22);
the clear water unit comprises a clear water tank (17) and a backwashing water pump (18); the backwashing water pump (18) is connected to the inner bottom of the clean water tank (17); a third water outlet (23) is arranged on the side wall of the bottom of the clean water tank (17); the backwashing water pump (18) is connected with the control unit through an electric wire.
2. The device for treating the produced water of the premixed scale-forming oilfield of claim 1, wherein: also comprises a fixing frame (24); the flocculation sedimentation unit is connected to the upper surface of the bottom of one end of the inner side of the fixing frame (24), the flocculation sedimentation unit is connected to the upper surface of the fixing frame (24) on the upper portion of the premixing unit, the adjusting unit is connected to the middle of the fixing frame (24), the clear water unit is connected to the upper surface of the bottom of the other end of the inner side of the fixing frame (24), and the filtering unit is connected between the adjusting unit and the clear water unit.
3. The device for treating the produced water of the premixed scale-forming oilfield of claim 1, wherein: the single layer of the pre-scaling filter layer (6) is provided with an independent frame, and the pre-scaling filter layer (6) is in sealing connection with the tank body of the pre-scaling raw water tank (5).
4. The device for treating the produced water of the premixed scale-forming oilfield of claim 1, wherein: the reaction tank (8) is internally provided with interception plates (25) in an up-down staggered way; the interception plate (25) divides the reaction tank (8) into a plurality of chambers, and the stirrer (9) and the inclined plate sedimentation tank (10) are respectively arranged in different chambers; the water inlet pipe line of the reaction tank is provided with a first sampling port (26).
5. A method for treating the produced water of a premixed and scaled oilfield, which is characterized by adopting the device for treating the produced water of the premixed and scaled oilfield according to any one of claims 1 to 4, and comprising the following steps:
step one: determining the proper mixing proportion
Taking two produced water to be mixed, respectively carrying out water quality ion detection and analysis, simulating water quality scaling tendency, and giving out the maximum scaling quantity of the two water qualities under the mixing condition of different proportions, wherein the ratio of the maximum scaling quantity after mixing is the proper mixing ratio of the two water qualities;
step two: mixing two incompatible produced water pre-fouls
According to the proper mixing proportion determined in the first step, two incompatible produced water are respectively fed into a premixed scaling raw water tank through a first water inlet pipe (1) and a second water inlet pipe (2) of a premixed scaling oilfield produced water treatment device, fully mixed in the premixed scaling raw water tank, and maximized scaling settlement through a pre-scaling filter layer (6) arranged in the tank;
step three: coagulation sedimentation treatment
The produced water after full mixing and scaling purification in the second step is lifted by a lifting pump (7) of a pre-mixing scaling oilfield produced water treatment device and enters a reaction tank (8), the concentration of residual scaling ions in the mixed water is analyzed through water quality detection, and then targeted chemical adding and sedimentation are carried out, and when the residual scaling cations are more, medicines such as sodium carbonate, aluminum sulfate and the like are added to promote the sedimentation of the scaling ions such as calcium, magnesium and the like;
step four: pH value adjustment of produced water after mixing
The mixed solution after coagulation sedimentation treatment in the step three enters a pH adjusting tank (12), and the pH of the mixed solution is adjusted to be neutral to meet the reinjection requirement by adjusting the numerical value measured by an online pH detector and adding a medicament;
step five: produced water filtration
And D, filtering the produced water which is regulated to be neutral in the step four by a middle water pump (14) through a filtering unit, and storing the filtered produced water in a clean water tank (17) for external transmission to finish the whole process of the treatment of the produced water of the premixed scaling oilfield.
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