CN101597108B - Method for reducing scaling between oil field oil extraction transportation system and stratum - Google Patents
Method for reducing scaling between oil field oil extraction transportation system and stratum Download PDFInfo
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- CN101597108B CN101597108B CN2009100160673A CN200910016067A CN101597108B CN 101597108 B CN101597108 B CN 101597108B CN 2009100160673 A CN2009100160673 A CN 2009100160673A CN 200910016067 A CN200910016067 A CN 200910016067A CN 101597108 B CN101597108 B CN 101597108B
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Abstract
The invention relates to a method for reducing scaling between the oil field oil extraction transportation system and stratum. Produced water is processed by oil removal and air floatation followed by being removed of solid suspended particles by a filter and of impurity in water by a dead end ultrafiltration membrane separation device, and the ultrafiltration produced water is introduced into a nanofiltration membrane separation device to obtain nanofiltration softened water of the produced water; nanofiltration softened water of clear water is prepared; nanofiltration softened water of clear water and nanofiltration softened water of the produced water are fully mixed by a static mixer to be taken as injected water or water used for preparing polymer mother liquor; nanofiltration softened water of clear water and nanofiltration softened water of the produced water are fully mixed to take as oil extraction re-injection water or water used for diluting the polymer mother liquor. The invention has the advantages that scaling components are radically removed, and the water quality after processing does not harm the stratum, thus improving oil displacement efficiency and oil field extraction efficiency, realizing zero emission of waste water, and having good economic and environmental benefits.
Description
Technical field:
The present invention relates to a kind of method that reduces oil field oil extraction transportation system and stratum fouling; Be particularly related to and utilize membrane separation process to carry out produced water deep processing and recycle at sea in a kind of production process of recovering the oil; And the method for preventing gathering system and stratum fouling in the mixed water injection process of removing contamination, belong to the technical field that improves oil recovery rate.
Background technology:
In the oil production process, contain a large amount of water in the oil extraction liquid, water ratio is generally more than 60%, and what have surpasses 90%, even is up to 98%.Produce great amount of wastewater after the oily water separation, mainly contain in the waste water: a large amount of suspended substances, total suspended solid is 50-200mg/L, and COD (CODcr) is 150-400mg/L, and salinity is 3000-50000mg/L, and total oil is 10-100mg/L.Direct discharging of waste water is not only wasted precious water resource, and severe contamination and destruction periphery ecotope.Land each main oilfield of China adopts the mode of the water filling or the polymer injection displacement of reservoir oil mostly, with re-injection after the produced water disposal.Existing produced water disposal technology mainly adopts traditional methods such as gravity settling, air supporting, filtration, and the water after the processing is difficult to reach oil recovery re-injection water to requirements in water quality, and particularly the prepared polymer displacement of reservoir oil is to the requirement of water quality high standard.Re-injection water water quality inferiority has a strong impact on stabilizing and increasing of oil production output.
In recent years, membrane technique begins that application is arranged in produced water disposal, utilizes ultra-filtration membrane to remove wherein oils and suspended substance, utilizes nf membrane to remove the divalent ion composition of easy fouling wherein, reaches the processing index of re-injection water.One Chinese patent application number 02111402.1 is disclosed to be a kind of " utilizing membrane separation technique to carry out oil production waste water in oil field advanced treatment and cyclic utilization method "; Adopt ultrafiltration and nanofiltration membrane separation technology to carry out oil production waste water in oil field advanced treatment and recycle, with the nanofiltration filtrate as oil-field flooding or prepared polymer solution.One Chinese patent application numbers 200720025918.7 discloses a kind of " the oil extraction-generated waste water treatment unit is used in the low permeability oil field re-injection ", adopts the technical process of bio-contact oxidation, ultrafiltration, nanofiltration to handle recovered water.The nanofiltration water outlet is as oil-field flooding.The problem that above-mentioned embrane method produced water disposal exists is; Because it is higher to be prone to the concentration of scale-forming ion in the recovered water, the water recovery of nf membrane only has 40-70%, so produces a large amount of concentrated waste water in the concentration process; The composition that wherein contains a large amount of easy foulings; This waste water can't be handled, and can only inject undergroundly with the mode of invalid re-injection, or emits after up to standard.
Land each main oilfield of China adopts the mode of the water filling or the polymer injection displacement of reservoir oil mostly; The water yield that the extraction WWT is provided often is difficult to satisfy the water yield requirement of re-injection water; Therefore need take other water source as make up water, generally adopt clear water (river or beat water supply well extraction shallow ground water) to make supplementary water injection.In the prior art, the oil-field flooding branch of generally taking to remove contamination is annotated or is removed contamination and handle respectively, and the water after the processing is the method for mixed water injection again.But because ion in the clear water and the ion in the recovered water are incompatible, being prone to react forms deposition, causes serious pipeline fouling and etching problem, and causes the heavy damage on stratum, greatly reduces the turnout in oil field.One Chinese patent application numbers 95116410.4 is disclosed to be a kind of " flooding water treatment method by mixing clean water with sewage ", makes clean and dirt water that precipitin reaction take place on the ground, and removes the deposition that generates through the flocculation filtration method.Its shortcoming is that the easy fouling composition in the formed mixing clean water with sewage water filling is in saturation concentration, and this is disadvantageous for water filling, when water filling, still need add Scale inhibitors, and generally adopts traditional flocculation process method can not reach the injection water quality standard fully.
In the offshore oil field development process, the water yield that exists the extraction WWT to be provided does not equally satisfy the problem that the re-injection water yield requires, and its terms of settlement is to play the water supply well water intaking or directly inject seawater.But at sea, deep-sea particularly, the expense of beating water supply well is near the expense that makes hole, and owing to have corrosion and sea turn, the wave of line of pipes under water, a series of problems such as stress of stream, running cost is also high, and risk is bigger.Owing to contain the composition that is prone to fouling in seawater or the clear water, directly inject the stratum, can form a large amount of incrustation scales.Generally take to add the mode that Scale inhibitors prevents fouling.
The U.S. horse traction hectolitre oil Plummer of company discloses a kind of " Preventing plugging by insoluble salts in a hydrocarbon-bearing formation " in the U.S. Pat 4723603A1 of application in 1988; Propose to adopt reverse osmosis membrane to remove the sulfate ion that is prone to the divalence of fouling in the seawater; Reverse osmosis membrane is produced water as water filling, prevent the technology that the oil-containing reservoir stops up.U.S. GE company discloses the rolling nf membrane that a kind of employing has three-decker in the patent US2004007358 (A1) of application in 2004, removes the divalent sulfur acid ion that is prone to fouling in the seawater, with the technology of the softening seawater of nanofiltration as water filling.The key that removes vitriol is to adopt the nanofiltration membrane separation technology.The characteristics of nf membrane are that the film surface generally has a certain amount of negative charge, optionally remove the sulfate ion in the seawater, obtain the seawater of protosulfate content.At present, this technology is being carried out a large amount of research and application both at home and abroad aspect the pre-treatment of sea water desaltination.But because the water recovery of nf membrane process generally has only about 50%-60%, the concentrated seawater of residue 40%-50% then can't utilize, and can only drain.Therefore, how the above-mentioned patent concentrated seawater not considering nanofiltration and produced is handled.Because the composition of this concentrated seawater and local seawater has bigger difference, does not meet the ocean environment rules.Simultaneously, the part recovered water of offshore oilfield does not reach waterflooding requirement and effluxes, and causes serious environmental to pollute yet.
Therefore, no matter be that onshore oil field or offshore oilfield all demand developing new water supply and water treatment mode urgently, solve the problem and the problem of environmental pollution of fouling effectively, and reduce cost, guarantee the oil field stably manufactured, improve the economic benefit of oil recovery process.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of prior art; Fouling to existing in the above-mentioned oil field produced water treatment and the mixed water injection of removing contamination is serious, formation damage is serious; And problem such as the efflux wastewater amount is big, environmental pollution is serious, propose to utilize the membrane separation technique method of reduction oil field oil extraction transportation system and stratum fouling that combines with chemical process.Present method makes full use of the incompatibility of recovered water and clear water based on membrane separation technique, and these two kinds of water all need pass through the softening characteristics of handling of film; Recovered water and clear water are handled through nanofiltration is softening respectively; And with the dense water mixing of nanofiltration that these two kinds of water produce respectively, precipitin reaction takes place, filter then and remove deposition; In treating processes, do not add any Scale inhibitors and other pharmaceutical chemicals, can realize the zero release of waste water.
The inventive method is operated according to following steps:
1, after recovered water process oil removal and air supporting processing removal suspension oil droplet and part oil in water emulsion, the dissolving oil; Removing particle diameter through more medium filter or stacked self-cleaning filter is the solid suspended particles more than 5 microns, removes the colloid in the water, residual oil content, fine suspension, CODcr, polymkeric substance etc. through dead end ultra-filtration membrane tripping device again, and the SDI (SDI) that ultrafiltration is produced in the water drops to below 3.0; Turbidity is less than 0.1 degree (NTU); Total oil produces water with ultrafiltration and introduces the nanofiltration membrane separation device, through nanofiltration less than 1mg/L; Obtain all lower nanofiltration permeate water of divalent ion and organic content, i.e. the nanofiltration softening water of recovered water.Final effluent quality reaches turbidity less than 0.01NTU, and CODcr is less than 60mg/L, and total oil is less than 0.1mg/L.
2, clear water is through after sterilization or killing the algae processing; Removing particle diameter through more medium filter or stacked self-cleaning filter is the solid suspended particles more than 5 microns; Again through the organism in the dead end ultra-filtration membrane tripping device removal water, colloid, fine suspension etc.; The SDI (SDI) that ultrafiltration is produced in the water drops to below 3.0, water is produced in ultrafiltration introduce the nanofiltration membrane separation device, and ultrafiltration is produced water through nanofiltration; Obtain all lower nanofiltration permeate water of divalent ion, salinity and organic content, i.e. the nanofiltration softening water of clear water.Final effluent quality reaches turbidity less than 0.01NTU, and CODcr is less than 60mg/L.
3, with the nanofiltration softening water of the nanofiltration softening water of clear water and recovered water through behind the static mixer thorough mixing, as injecting water; Or, promptly in mixed nanofiltration softening water, adding molecular weight water-soluble polymers as prepared polymer mother liquor water, preparation is used for the polymer mother liquor of polymer flooding.
4, with the dense water of nanofiltration of dense water of the nanofiltration of clear water and recovered water through behind the mixing tank thorough mixing; Precipitin reaction takes place; Get into stacked self-cleaning filter, the incrustation scale that remove to generate is after resulting filtrating is passed through the static mixer thorough mixing with the nanofiltration softening water of the nanofiltration softening water of recovered water and clear water again; As injecting water or being used for the polymer mother liquor of dilution step 3, the polymers soln after the dilution is injected the oil reservoir displacement of reservoir oil.
Clear water of the present invention not only comprises the treating water in shallow-layer well water or river, lake, river, also comprises brackish water and seawater.
The ultra-filtration membrane tripping device of recovered water and clear water all adopts resistant to elevated temperatures tubular fibre formula hyperfiltration membrane assembly, and molecular weight cut-off is 3-16 ten thousand dalton, and service temperature is 10-80 ℃, and working pressure is 0.1-0.5MPa.The product water recovery of ultrafiltration is 60%-98%.The nanofiltration membrane separation device of recovered water and clear water all adopts resistant to elevated temperatures rolling or hollow fiber nanofiltration membrane assembly, and service temperature is 10-80 ℃, and working pressure is 0.5-4.2MPa, and the product water recovery of nanofiltration is 50-80%.
The ultra-filtration equipment of recovered water and clear water all adopts the dead-end filtration pattern, and the product water recovery of ultrafiltration is 60%-98%, the waste discharge of ultrafiltration get back to the oil field extracted water Air-float separator before mix with the grease trap water outlet, do not produce efflux wastewater.
The clear water saltiness that the present invention relates to is 500-40000mg/L; The saltiness of recovered water is 2000-200000mg/L.
The advantage of reduction oil field oil extraction transportation system of the present invention and stratum fouling method is:
(1) solved recovered water and handled through nanofiltration that the dense water in back directly effluxes or the water loss of invalid re-injection, and the formation damage that brings thus, water environment pollution and water resource waste problem.Realize the complete recycle and the zero release of recovered water, protected ecotope, reduced production cost.
(2) solve the dense water of clear water after nanofiltration is handled and effluxed the environmental pollution that brings, and the water resource waste problem, production cost reduced.
(3) solved the direct re-injection of recovered water or inject clear water and the collector and delivery pipe road that the mixed water injection process of removing contamination exists and the scale problems on stratum.
(4) make full use of nf membrane and concentrate bivalent ions characteristics and recovered water and inject the incompatible characteristics of water, remove the composition that is prone to fouling in recovered water and the clear water, and do not add any Scale inhibitors, saved the chemical expense.
(5) only produce a spot of solid incrustation scale in the whole water treatment procedure, help transportation and landfill, and do not produce environmental pollution.
One of key link of oil-field development is the water filling and the polymer injection displacement of reservoir oil.Its key problem in technology is the injection water that utilizes water technology to provide to meet the injection water quality index request, prevents fouling, and guarantees enough water yields.Method proposed by the invention can improve the utilization ratio of water greatly, avoids fouling, improves water flooding efficient and RF; Reduce cost significantly, ensure the high-efficiency continuous stably manufactured in oil field, and do not add other chemical agent; Easy and simple to handle; Energy consumption is low, is easy to be extended and applied, and has remarkable economic efficiency, environmental benefit and wide application prospect.
Description of drawings:
Fig. 1 handles the water filling schematic flow sheet for the embrane method that reduces oil field oil extraction transportation system and stratum fouling.
Fig. 2 handles for the embrane method that reduces oil field oil extraction transportation system and stratum fouling and joins conflux journey synoptic diagram.
Embodiment:
Below in conjunction with specific embodiment and accompanying drawing the present invention is done further explanation.
Its flow process is as shown in Figure 1, recovered water: the clear water ratio is 1: 0.5, and the water type of recovered water is CaCl
2Type, clear water are seawater.
The first step after recovered water 1 process grease trap 2 and Air-float separator 3 removal suspension oil droplets and part oil in water emulsion, the dissolving oil, makes oleaginousness wherein be lower than 10mg/L; Get into more medium filter or stacked self-cleaning filter 4 then; Removing particle diameter is the solid suspended particles more than 5 microns, removes the colloid in the water, residual oil content, suspended substance, CODcr, polymkeric substance etc. through dead end ultra-filtration membrane tripping device 5 then, and the SDI (SDI) that makes ultrafiltration produce water drops to below 3.0; Turbidity is less than 0.1NTU; Total oil is less than 1mg/L, and the dense water of ultrafiltration mixes with grease trap 2 water outlets before turning back to Air-float separator 3, does not produce efflux wastewater.The product water of ultrafiltration gets into nanofiltration membrane separation device 6, and is softening through nanofiltration, obtains all lower nanofiltration permeate water of divalent ion and organic content, i.e. the nanofiltration softening water of recovered water.
Second step; Sterilization or the clear water 8 that kills after algae is handled are the solid suspended particles more than 5 microns through more medium filter or stacked self-cleaning filter 9 removal particle diameters; Organism in the entering dead end ultra-filtration membrane tripping device 10 removal water, colloid, suspended substance etc.; The SDI (SDI) that makes ultrafiltration produce water drops to below 3.0, and the dense water part of the ultrafiltration of clear water is returned self-cleaning filter 9.As containing a certain amount of oils in the clear water, then can the dense water of a part of ultrafiltration be introduced in the Air-float separator 3 of recovered water.The ultrafiltration of clear water is produced water and got into nanofiltration membrane separation device 11, and is softening through nanofiltration, obtains all lower nanofiltration permeate water of divalent ion, salinity and organic content, i.e. the nanofiltration softening water of clear water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 60%.
In the 3rd step, the nanofiltration softening water of clear water and the nanofiltration softening water of a recovered water part directly get into waterflood system 7, and another part gets into static mixer 16, thorough mixing.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 gets into static mixer 16, and after the nanofiltration softening water of the nanofiltration softening water of recovered water and clear water mixed, water quality reached the water filling standard, entering waterflood system 17.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 2, recovered water: the clear water ratio is 1: 0.5, and the water type of recovered water is CaCl
2Type, clear water are seawater.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a seawater.
The equal recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 60%.
The 3rd step; The nanofiltration softening water of recovered water and the nanofiltration softening water of clear water are through behind static mixer 18 thorough mixing; Part mixing water gets into to join and gathers device 19; And to add molecular weight be 2,000 ten thousand-4,500 ten thousand high molecular weight water-soluble SEPIGEL 305 20, and preparation is used for the polymer mother liquor of polymer flooding.Mother liquor gets into diluted mixture device 22.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, discharges mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 and part nanofiltration remollescent mixing water get into static mixer 21 mix after; Get into again in the diluted mixture device 22 and mix with polymer mother liquor; Polymers soln after the dilution reaches the water quality standard of the polymer injection displacement of reservoir oil, gets into polymer injector system 23.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 1, recovered water: the clear water ratio is 1: 0.6, and the water type of recovered water is CaCl
2Type, clear water are brackish water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a brackish water.
The ultrafiltration recovery of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
In the 3rd step, the nanofiltration softening water of clear water and the nanofiltration softening water of recovered water get into static mixer 16, thorough mixing.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 gets into static mixer 16, and after the nanofiltration that water and clear water are produced in the nanofiltration of recovered water was produced water and mixed, water quality reached the water filling standard, entering waterflood system 17.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 2, recovered water: the clear water ratio is 1: 0.4, and the water type of recovered water is CaCl
2Type, clear water are brackish water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a brackish water.
The ultrafiltration recovery of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
The 3rd step; The nanofiltration softening water of recovered water and the nanofiltration softening water of clear water are through behind static mixer 18 thorough mixing; Part mixing water gets into to join and gathers device 19; And to add molecular weight be 2,000 ten thousand-4,500 ten thousand high molecular weight water-soluble SEPIGEL 305 20, and preparation is used for the polymer mother liquor of polymer flooding.Mother liquor gets into diluted mixture device 22.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 and part nanofiltration remollescent mixing water get into static mixer 21 mix after; Get into again in the diluted mixture device 22 and mix with polymer mother liquor; Polymers soln after the dilution reaches the water quality standard of the polymer injection displacement of reservoir oil, gets into polymer injector system 23.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 1, recovered water: the clear water ratio is 1: 0.6, and the water type of recovered water is CaCl
2Type, clear water are shallow-layer well water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a shallow-layer well water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
In the 3rd step, the nanofiltration softening water of clear water and the nanofiltration softening water of recovered water get into static mixer 16, thorough mixing.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 gets into static mixer 16, and after the nanofiltration softening water of the nanofiltration softening water of recovered water and clear water mixed, water quality reached the water filling standard, entering waterflood system 17.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 2, recovered water: the clear water ratio is 1: 0.7, and the water type of recovered water is CaCl
2Type, clear water are river (river) water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a shallow-layer well water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
The 3rd step; The nanofiltration softening water of recovered water and the nanofiltration softening water of clear water are through behind static mixer 18 thorough mixing; Part mixing water gets into to join and gathers device 19; And to add molecular weight be 2,000 ten thousand-4,500 ten thousand high molecular weight water-soluble SEPIGEL 305 20, and preparation is used for the polymer mother liquor of polymer flooding.Mother liquor gets into diluted mixture device 22.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 and part nanofiltration remollescent mixing water get into static mixer 21 mix after; Get into again in the diluted mixture device 22 and mix with polymer mother liquor; Polymers soln after the dilution reaches the water quality standard of the polymer injection displacement of reservoir oil, gets into polymer injector system 23.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 1, recovered water: the clear water ratio is 1: 0.4, and the water type of recovered water is CaCl
2Type, clear water are river (river) water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is river (river) water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
In the 3rd step, the nanofiltration softening water of clear water and the nanofiltration softening water of recovered water get into static mixer 16, thorough mixing.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 gets into static mixer 16, and after the nanofiltration that water and clear water are produced in the nanofiltration of recovered water was produced water and mixed, water quality reached the water filling standard, entering waterflood system 17.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 2, recovered water: the clear water ratio is 1: 0.5, and the water type of recovered water is CaCl
2Type, clear water are river (river) water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is river (river) water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
The 3rd step; The nanofiltration softening water of recovered water and the nanofiltration softening water of clear water are through behind static mixer 18 thorough mixing; Part mixing water gets into to join and gathers device 19; And to add molecular weight be 2,000 ten thousand-4,500 ten thousand high molecular weight water-soluble SEPIGEL 305 20, and preparation is used for the polymer mother liquor of polymer flooding.Mother liquor gets into diluted mixture device 22.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 and part nanofiltration remollescent mixing water get into static mixer 21 mix after; Get into again in the diluted mixture device 22 and mix with polymer mother liquor; Polymers soln after the dilution reaches the water quality standard of the polymer injection displacement of reservoir oil, gets into polymer injector system 23.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 1, recovered water: the clear water ratio is 1: 0.5, and the water type of recovered water is CaCl
2Type, clear water are lake water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a lake water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
In the 3rd step, the nanofiltration softening water of clear water and the nanofiltration softening water of recovered water get into static mixer 16, thorough mixing.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 gets into static mixer 16, and after the nanofiltration that water and clear water are produced in the nanofiltration of recovered water was produced water and mixed, water quality reached the water filling standard, entering waterflood system 17.Water-quality guideline after the processing is listed in table 1.
Its flow process is as shown in Figure 2, recovered water: the clear water ratio is 1: 0.4, and the water type of recovered water is CaCl
2Type, clear water are lake water.
According to the first step, the operation of second step of embodiment 1, wherein, clear water is a lake water.
The recovery of the ultrafiltration of recovered water and clear water treatment unit is 95%, and the recovery of nanofiltration is 70%.
The 3rd step; The nanofiltration softening water of recovered water and the nanofiltration softening water of clear water are through behind static mixer 18 thorough mixing; Part mixing water gets into to join and gathers device 19; And to add molecular weight be 2,000 ten thousand-4,500 ten thousand high molecular weight water-soluble SEPIGEL 305 20, and preparation is used for the polymer mother liquor of polymer flooding.Mother liquor gets into diluted mixture device 22.
In the 4th step, the dense water of nanofiltration of dense water of the nanofiltration of recovered water and clear water gets into dense water static mixer 12, reacts, and generates post precipitation, gets into self-cleaning filter device 13, will precipitate sludge filtration and remove.Body refuse gets into settling bowl 14, tells mud 15 from the bottom, and supernatant returns static mixer 12.The filtered water of self-cleaning filter device 13 and part nanofiltration remollescent mixing water get into static mixer 21 mix after; Get into again in the diluted mixture device 22 and mix with polymer mother liquor; Polymers soln after the dilution reaches the water quality standard of the polymer injection displacement of reservoir oil, gets into polymer injector system 23.Water-quality guideline after the processing is listed in table 1.
Water-quality guideline after table 1 is handled
Claims (7)
1. method that reduces oil field oil extraction transportation system and stratum fouling; It is characterized in that operating: the first step according to following steps; After recovered water process oil removal and air supporting processing removal suspension oil droplet and oil in water emulsion, the dissolving oil; Remove solid suspended particles through strainer, remove the colloid in the water, residual oil content, tiny suspended particle through dead end ultra-filtration membrane tripping device again, the SDI that ultrafiltration is produced in the water drops to below 3.0; Water is produced in ultrafiltration introduce the nanofiltration membrane separation device, obtain the nanofiltration softening water of recovered water; Second step; Clear water is after sterilization and killing the algae processing; Remove solid suspended particles through strainer, remove organism in the water, colloid, tiny suspended particle through dead end ultra-filtration membrane tripping device again, the SDI that makes ultrafiltration produce water drops to below 3.0; Water is produced in ultrafiltration introduce the nanofiltration membrane separation device, obtain the nanofiltration softening water of clear water; The 3rd step is behind the nanofiltration softening water thorough mixing with the nanofiltration softening water of clear water and recovered water, as injection water or as prepared polymer mother liquor water; The 4th step; Behind the dense water thorough mixing of the nanofiltration of dense water of the nanofiltration of clear water and recovered water; The incrustation scale that filter to remove generates, resulting filtrating again with the nanofiltration softening water thorough mixing of the nanofiltration softening water of recovered water and clear water after, as injection water or be used for the polymer mother liquor of dilution step three; Wherein, said recovered water is CaCl
2The type recovered water.
2. a kind of method that reduces oil field oil extraction transportation system and stratum fouling according to claim 1; It is characterized in that: described clear water is shallow-layer well water or river, lake, the treating water in river, brackish water, seawater; The saltiness of clear water is 500-40000mg/L, and the saltiness of recovered water is 2000-200000mg/L.
3. a kind of method that reduces oil field oil extraction transportation system and stratum fouling according to claim 1; It is characterized in that: the ultra-filtration membrane tripping device of recovered water and clear water all adopts resistant to elevated temperatures tubular fibre formula hyperfiltration membrane assembly; Molecular weight cut-off is 3-16 ten thousand dalton; Service temperature is 10-80 ℃, and working pressure is 0.1-0.5MPa.
4. a kind of method that reduces oil field oil extraction transportation system and stratum fouling according to claim 1; It is characterized in that: the nanofiltration membrane separation device of recovered water and clear water all adopts resistant to elevated temperatures rolling or hollow fiber nanofiltration membrane assembly; Service temperature is 10-80 ℃; Working pressure is 0.5-4.2MPa, and the product water recovery of nanofiltration is 50-80%.
5. a kind of method that reduces oil field oil extraction transportation system and stratum fouling according to claim 1; It is characterized in that: the ultra-filtration membrane tripping device of recovered water and clear water adopts the dead-end filtration pattern; The product water recovery of ultrafiltration is 60%-98%; The waste discharge of ultrafiltration gets into Air-float separator with after the grease trap water outlet mixes, and does not produce efflux wastewater.
6. a kind of method that reduces oil field oil extraction transportation system and stratum fouling according to claim 1 is characterized in that: the nanofiltration softening water of the 3rd step recovered water directly injects the oil reservoir displacement of reservoir oil with after the nanofiltration softening water of clear water mixes as injection water; Or mix the back conduct with process hybrid reaction scale removal dense water afterwards and inject water; Perhaps with adding molecular weight water-soluble polymers in the mixed nanofiltration softening water, preparation is used for the polymer mother liquor of the polymer injection displacement of reservoir oil.
7. a kind of method that reduces oil field oil extraction transportation system and stratum fouling according to claim 1 is characterized in that: the 4th step polymer mother liquor injects the oil reservoir displacement of reservoir oil through after diluting with the polymers soln after the dilution.
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