CN101880099A - Treatment process for oilfield water comprehensive recovery - Google Patents
Treatment process for oilfield water comprehensive recovery Download PDFInfo
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- CN101880099A CN101880099A CN 201010215701 CN201010215701A CN101880099A CN 101880099 A CN101880099 A CN 101880099A CN 201010215701 CN201010215701 CN 201010215701 CN 201010215701 A CN201010215701 A CN 201010215701A CN 101880099 A CN101880099 A CN 101880099A
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Abstract
The invention discloses a treatment process for oilfield water comprehensive recovery. The process comprises the following steps of: (1) passing oilfield water through a settling tank, adding mirabilite into the tank, uniformly stirring the solution, adding alkali into the solution to regulate the pH to be about 10 at the same time, and settling; (2) preparing calcium sulfate from sediments prepared in step (1) by centrifugal drying and dehydration; (3) introducing supernatants prepared in step (1) into a multi-effect evaporation tank to perform vacuum evaporation and prepare solid sodium chloride; (4) further heating and concentrating salt-producing mother liquor in step (3) by using a concentration tank to obtain concentrated halogen; (5) preparing potassium chloride by using the concentrated halogen; (6) preparing crude bromine by using the mother liquor from the potassium chloride preparation and rectifying the crude bromine to prepare bromine; and (7) recycling the water of which salts are extracted in step (1) to step (6) to use the water as industrial water. The process has the advantages of recycling useful resources from the oilfield water, such as an inorganic salt and the like, and greatly relieving water shortages in oil exploitation areas.
Description
Technical field
The present invention relates to sewage treatment process, especially relate to a kind of comprehensive reutilization treatment process that contains higher oil-field water such as sodium, calcium, chlorine, bromine, sulfate radical.
Background technology
Oil-field water is the underground water that directly is communicated with oil (gas) layer.It forms unified fluid system with oil (gas).The underground water in generalized oil-field water general reference oil (gas) zone, field comprises oil (gas) layer water and non-oil (gas) layer water.Oil-field water is the same with oil gas to be present in the hole, hole, seam of reservoir.In a hydrocarbon-bearing pool, all include oil, G﹠W usually, by gravity segregation, gas is last, and oil is placed in the middle, and water forms oil-gas, oil-water and gas-water table down.Relative position according to oil (gas) water is divided into Di Shui and Bian Shui with oil-field water.End water refers to oil-containing (gas) outer edge with interior water, and the water beyond oil-containing (gas) outer edge claims limit water.The oil-field water source has: 1. residual water, or title connate water.Be filled in intergranular pore water during the settling deposition, behind the buried diagenesis of settling, water is stored in the stratum.2. water leaking-in.Atmospheric precipitation, surface water are appeared along the reservoir or tomography, crack penetrate into the water in the reservoir.3. plutonic water.From earth mantle and crust depth high temperature, high salinity, be full of the underground water of gas.The generation of oil, migration, gathering are so that loss all is to take place under the situation that underground water exists.
Oil is carried out unavoidably emitting of oil-field water in the process, will do not caused great effect to environment if do not handle.Traditional treatment process focuses on removal oil content wherein, and has ignored the comprehensive reutilization of resource wherein.
Summary of the invention
At the problem of above-mentioned proposition, the object of the invention is to provide a kind of and comprehensively reclaims the wherein treatment process of resource from contains higher oil-field water such as sodium, calcium, chlorine, bromine, sulfate radical.
The present invention is achieved in that the treatment process that a kind of oilfield water comprehensive is recycled, and takes following processing step:
(1), oil-field water is by settling pool, adds saltcake in the pond, stirs, and adds alkali simultaneously and transfers about PH=10, and is heavy clear;
(2), the throw out of step (1) preparation is produced calcium sulfate by the centrifugal drying dehydration;
(3), the supernatant liquor of step (1) preparation fed the multiple-effect evaporation jar carry out vacuum-evaporation, produce solid sodium chloride;
(4), with the salt-making mother liquor of step (3) by concentration tank further heating concentrate, become dense halogen;
(5), adopt dense stew in soy sauce potassium chloride;
(6), the mother liquor produced behind the Repone K is used to produce thick bromine, thick bromine is produced bromine by rectifying;
(7), with step (1)--the water that step (6) is extracted behind the salinity reclaims as process water.
In the above-mentioned steps (1) add-on of saltcake preferably in calcium ion in the oil-field water all generate the required saltcake of calcium sulfate theoretical amount 120%.。
It is as follows that step (3) solid sodium chloride is produced concrete steps: the supernatant liquor of step (1) preparation is fed the multiple-effect evaporation jar carry out vacuum-evaporation, the sodium chloride crystal that crystallization is separated out in evaporating pot makes solid sodium chloride after centrifugal, drying.
Multiple-effect evaporation jar preferred 3,4 or 5 is imitated evaporating pot, decides according to the content of each composition in the oil-field water.
As a kind of optimal way, step (5) adopts dense stew in soy sauce potassium chloride, at first makes carnallitite by converting halogen technology, and carnallitite adds water decomposition, by flotation, obtains rough Repone K, through washing, centrifugation, obtains the industrial potassium chloride product again.
As a kind of optimal way, step (6) is: the mother liquor that will produce behind the Repone K feeds the bromine tower, and feed chlorine oxidation in the mother liquor after producing Repone K, feed water vapour from the bromine tower bottom simultaneously, the simple substance bromine of separating out after it will be reacted is taken out of together, goes out thick bromine and bromine water through fractionation by distillation, in the thick bromine owing to also contain the chlorine of taking out of, further rectifying makes bromine separate with chlorine again, finally obtains qualified bromine product.
The calcium sulfate of step (2) preparation also can be as being used to produce sodium-chlor in the crystal seed adding vacuum-evaporator unit in step (3).
On the basis of the oil content of the present invention in traditional removal oil-field water, reclaim resources such as wherein useful calcium sulfate, sodium-chlor, Repone K, bromine, again can be with water circulation use.Have useful resources and the advantage that can largely alleviate the water resources anxiety in oil exploiting field in the refiltered oil water in field.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in further detail.
The treatment process that a kind of oilfield water comprehensive is recycled, take following processing step:
(1), oil-field water is by settling pool, adds the saltcake that all generates the theoretical amount 120% of the required saltcake of calcium sulfate with calcium ion in this oil-field water in the pond, stirs, hydro-oxidation sodium is transferred about PH=10 simultaneously, and is heavy clear;
(2), the throw out of step (1) preparation is produced calcium sulfate by the centrifugal drying dehydration;
(3), the supernatant liquor of step (1) preparation fed triple effect evaporator carry out vacuum-evaporation, the sodium chloride crystal that crystallization is separated out in evaporating pot makes solid sodium chloride after centrifugal, drying;
(4), with the salt-making mother liquor of step (3) by concentration tank further heating concentrate, become dense halogen;
(5), will go up the dense halogen that step obtains and make carnallitite by converting halogen technology earlier, carnallitite adds water decomposition, by flotation, obtains rough Repone K, through washing, centrifugation, obtains the industrial potassium chloride product again;
(6), the mother liquor that will produce behind the Repone K feeds the bromine tower, and feed chlorine oxidation in the mother liquor after producing Repone K, feed water vapour from the bromine tower bottom simultaneously, the simple substance bromine of separating out after it will be reacted is taken out of together, go out thick bromine and bromine water through fractionation by distillation, in the thick bromine owing to also contain the chlorine of taking out of, further rectifying again, bromine is separated with chlorine, finally obtain qualified bromine product;
(7), with step (1)--the water that step (6) is extracted behind the salinity reclaims as process water.
More than be that the treatment process that a kind of oilfield water comprehensive of the present invention is recycled is set forth; be used for helping to understand the present invention; but embodiments of the present invention are not restricted to the described embodiments; change, the modification that other any do not deviate under the principle of the invention to be done, substitute, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. the treatment process recycled of an oilfield water comprehensive is characterized in that taking following processing step:
(1), oil-field water is by settling pool, adds saltcake in the pond, stirs, and adds alkali simultaneously and transfers about PH=10, and is heavy clear;
(2), the throw out of step (1) preparation is produced calcium sulfate by the centrifugal drying dehydration;
(3), the supernatant liquor of step (1) preparation fed the multiple-effect evaporation jar carry out vacuum-evaporation, produce solid sodium chloride;
(4), with the salt-making mother liquor of step (3) by concentration tank further heating concentrate, become dense halogen;
(5), adopt dense stew in soy sauce potassium chloride;
(6), the mother liquor produced behind the Repone K is used to produce thick bromine, thick bromine is produced bromine by rectifying;
(7), with step (1)--the water that step (6) is extracted behind the salinity reclaims as process water.
2. the treatment process that a kind of oilfield water comprehensive according to claim 1 is recycled is characterized in that: described saltcake add-on is 120% of the theoretical amount that all generates the required saltcake of calcium sulfate in calcium ion in the oil-field water.
3. the treatment process that a kind of oilfield water comprehensive according to claim 1 is recycled, it is characterized in that: it is as follows that described step (3) solid sodium chloride is produced concrete steps: the supernatant liquor feeding multiple-effect evaporation jar of step (1) preparation is carried out vacuum-evaporation, the sodium chloride crystal that crystallization is separated out in evaporating pot makes solid sodium chloride after centrifugal, drying.
4. according to the treatment process of claim 1 or 3 described a kind of oilfield water comprehensives recyclings, it is characterized in that: described multiple-effect evaporation jar is 3,4 or 5 effect evaporating pots.
5. the treatment process that a kind of oilfield water comprehensive according to claim 4 is recycled, it is characterized in that: described step (5) adopts dense stew in soy sauce potassium chloride, at first make carnallitite by converting halogen technology, carnallitite adds water decomposition, by flotation, obtain rough Repone K, through washing, centrifugation, obtain the industrial potassium chloride product again.
6. the treatment process that a kind of oilfield water comprehensive according to claim 1 is recycled, it is characterized in that: described step (6) is: the mother liquor that will produce behind the Repone K feeds the bromine tower, and feed chlorine oxidation in the mother liquor after producing Repone K, feed water vapour from the bromine tower bottom simultaneously, the simple substance bromine of separating out after it will be reacted is taken out of together, go out thick bromine and bromine water through fractionation by distillation, in the thick bromine owing to also contain the chlorine of taking out of, further rectifying again, bromine is separated with chlorine, finally obtain qualified bromine product.
7. the treatment process that a kind of oilfield water comprehensive according to claim 1 is recycled is characterized in that: the calcium sulfate of step (2) preparation is added in the vacuum-evaporator unit as crystal seed in step (3) be used to produce sodium-chlor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102157019A CN101880099B (en) | 2010-06-30 | 2010-06-30 | Treatment process for oilfield water comprehensive recovery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102157019A CN101880099B (en) | 2010-06-30 | 2010-06-30 | Treatment process for oilfield water comprehensive recovery |
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| CN101880099A true CN101880099A (en) | 2010-11-10 |
| CN101880099B CN101880099B (en) | 2012-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112707414A (en) * | 2020-12-16 | 2021-04-27 | 云南科力环保股份公司 | Method for removing bromine from high-salinity wastewater |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429768A (en) * | 2001-12-31 | 2003-07-16 | 中盐制盐工程技术研究院 | Improved process of producing potassium chloride by halogen conversion method |
| CN101007642A (en) * | 2007-01-10 | 2007-08-01 | 青海省地质调查院 | Preparation method of lithium carbonate by using brine of oil field |
| CN101613085A (en) * | 2009-07-15 | 2009-12-30 | 中国科学院青海盐湖研究所 | Utilize the chloride-calcium type oil-field water to extract the method for bromine |
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- 2010-06-30 CN CN2010102157019A patent/CN101880099B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429768A (en) * | 2001-12-31 | 2003-07-16 | 中盐制盐工程技术研究院 | Improved process of producing potassium chloride by halogen conversion method |
| CN101007642A (en) * | 2007-01-10 | 2007-08-01 | 青海省地质调查院 | Preparation method of lithium carbonate by using brine of oil field |
| CN101613085A (en) * | 2009-07-15 | 2009-12-30 | 中国科学院青海盐湖研究所 | Utilize the chloride-calcium type oil-field water to extract the method for bromine |
Non-Patent Citations (2)
| Title |
|---|
| 《油田化学》 19900731 吴楼涛 油田水中的溴资源 第386-390页 1-7 , 第04期 2 * |
| 《盐业与化工》 20090930 马艳芳等 油田卤水提溴过程中应注意的几个问题 第1-3页 1-7 第38卷, 第05期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112707414A (en) * | 2020-12-16 | 2021-04-27 | 云南科力环保股份公司 | Method for removing bromine from high-salinity wastewater |
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