CN104445522B - Shale gas recycling fracturing flowback fluid treatment method - Google Patents
Shale gas recycling fracturing flowback fluid treatment method Download PDFInfo
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- CN104445522B CN104445522B CN201410616164.7A CN201410616164A CN104445522B CN 104445522 B CN104445522 B CN 104445522B CN 201410616164 A CN201410616164 A CN 201410616164A CN 104445522 B CN104445522 B CN 104445522B
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- 238000000034 method Methods 0.000 title claims abstract description 65
- 239000012530 fluid Substances 0.000 title abstract description 9
- 238000004064 recycling Methods 0.000 title abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 150000002500 ions Chemical class 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims description 30
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 239000008399 tap water Substances 0.000 claims description 11
- 235000020679 tap water Nutrition 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 238000001479 atomic absorption spectroscopy Methods 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000012952 Resampling Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 238000012958 reprocessing Methods 0.000 claims description 2
- 241000894006 Bacteria Species 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 33
- 238000005516 engineering process Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000001603 reducing effect Effects 0.000 description 4
- 230000000638 stimulation Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 238000000556 factor analysis Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 235000013311 vegetables Nutrition 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a shale gas recycling fracturing flowback fluid treatment method, which comprises the following steps: s1, detecting the ion content in the backflow liquid, wherein the control ranges are as follows: k+≤1500mg/L、Ca2+≤600mg/L、Na+≤2000mg/L、Mg2+≤1000mg/L、NH4 +Not more than 600mg/L, not more than 25mg/L of total Fe, Cl-≤3000mg/L、Al3+≤30mg/L、SO4 2-The concentration is not less than 200mg/L, COD and not more than 300mg/L, the standard is judged to be reached, and the up-to-standard flowback liquid is collected into a container for standby; s2, before the spare up-to-standard flow-back fluid is injected into the ground for fracturing construction, two formulas are adopted for comparison test; the method is particularly suitable for treating the stratum fracturing flowback fluid which is used immediately after being recovered or is stored for no more than 10 days after being recovered, and can remove various mechanical impurities, ions, bacteria and the like which influence the flowback fluid during recovery, so that the treated flowback fluid can meet the requirement of repeated use, the consumption of shale gas development on water resources can be greatly reduced, the cost is reduced, and the win-win situation of protecting the environment is realized.
Description
Technical field
The present invention relates to oil and gas shale storage pressure break production technique field, exactly relate to a kind for the treatment of process of shale gas reuse fracturing outlet liquid, be applicable to stratafrac and return the process using or reclaim the rear shelf-time to be no more than 10 days immediately after discharge opeing is reclaimed.
Background technology
In the recovery process of oil and gas, pressure break is one of major measure of well production increment and intensified injection of wells, is exploration of oil and gas field and the indispensable important technical of exploitation.Be conventional stored condition adopt sandfrac well stimulation or the extensive shale gas production technique carried out at home for nearly 2 years all needs to prepare liquid of constructing in a large number.Therefore, for large-scale waterfrac treatment not only to the Freshwater resources build-up of pressure of China's shortage, and a large amount of backflow waste liquids generated cause very large pressure to environment, reuse can reduce again to environment pollution by saving water resource through process, therefore carry out the technical study of fracturing outlet liquid treatment for reuse significant.
China's shale gas exploitation is in the starting stage, has mainly used for reference the technology in U.S.'s shale gas exploitation in renovation technique.The individual well construction fluid volume of shale gas reservoir hydrfracturing often reaches a few all places, and a large amount of backflow waste liquids of generation cause very large pressure to environment, and discharge also causes the wasting of resources, has to pass through process and reuses.In U.S.'s shale gas probing, the water that the water having about 70% recycles from waterfrac treatment.China is in the starting stage for the exploitation of shale gas, in order to tackle the environment and renewable resource utilization problem that massive hydraulic fracture operation brings, in order to realize returning discharge opeing recycling truly to shale gas frac job, guarantee the Sustainable development that shale gas is exploited, explore the new technology implementing a kind of fracturing fluid recovery (backflow) liquid process recycling extremely urgent.Now, shale gas reservoir many employings platform construction, adopt batch production pressure break pattern, a platform will use pressure break slippery water 3 ~ 60,000 side, and slippery water formula is simple, but returns discharge opeing complicated component.Therefore; after analyzing shale gas reservoir hydrfracturing, different steps returns the performance of discharge opeing; the reusable influence factor of discharge opeing is returned in research; and through process; the discharge opeing performance of returning after process is made to meet reusable requirement and greatly can reduce the consumption of shale gas exploitation to water resources; realization reduces costs, the doulbe-sides' victory of protection of the environment.
New by looking into, finding Patents totally 8 in patent documentation data storehouse, is number of patent application 200910071306.5 respectively; Patent No. application number 200920246228.3; Patent No. application number 201010237746.6; Patent No. application number 201120570680.2; Patent No. application number 201320145527.4; Patent No. application number 201320425803.2; Patent No. application number 201320475827.9; Patent No. application number 201310693266.4.Listed patent item relates generally to oilfield stimulation conventional plant glue fracturing outlet liquid and detects or treatment unit or reuse method, does not relate to that shale gas reservoir slippery water fracturing outlet liquid detects, process and recycling technology.
Present shale gas reservoir adopts batch production fracturing technique, does not re-use vegetable jelly (guanidine glue) fracturing liquid of normal gas pools volume increase, but adopts slippery water sandfrac.Slippery water pressure break is similar to riverfrac treatment, but is equivalent to its construction infusion frictional resistance of clear water and can reduces by 70%, can realize huge discharge in construction process and inject.Slippery water formula is simple, has excellent to fall resistance, the row of helping, surely viscosity energy, and liquid is with low cost, and meanwhile, introducing reservoir liquid component is single, can reduce formation damage to greatest extent.And slippery water returns discharge opeing owing to being subject to formation rock absorption and reservoir pollution, composition becomes comparatively complicated, the one-tenth branch returning discharge opeing complexity affects it and reuses performance, particularly return the metal ion in discharge opeing, the dispersing and dissolving resistance-reducing performance of anionic friction reducer can be affected, even occur flocculation phenomenon.Return discharge opeing to need to detect by analysis and process before reusing, just can carry out supplemented by additives and be mixed with the construction pressure break of effective slippery water for next well time.Simultaneously, the raffinate discharge speed difference that the different well of different reservoir is secondary, returning discharge opeing collects different with the time of depositing, short, discharge and collect use, long then collection is deposited and is reached even 1 year several months, is depositing in process, liquid meeting critical deterioration, particularly produce a large amount of bacterium, SRB is most typical destructive bacterium, considers degerming before use.
The exploitation of domestic shale gas reservoir is at the early-stage, on-the-spot a large amount of slippery water fracturing outlet liquid from detection means, test set, treatment process, process equipment, reuse the aspects such as specification and be all in space state.Existing Patents technology, the treatment technology (comprising device and treatment process) returning discharge opeing of sandfrac liquid (i.e. plant gum fracturing fluid) is hidden mainly for water of oil-gas field process and conventional gas and oil, do not relate in shale gas reservoir exploitation, the reuse that discharge opeing is returned in slippery water sandfrac detects and processes and reusable technology.
Summary of the invention
The present invention is intended to for the defect existing for above-mentioned prior art and deficiency; a kind of shale gas reuse fracturing outlet liquid treatment process is provided; present method is particularly useful for stratafrac and returns the process using or reclaim the rear shelf-time to be no more than 10 days immediately after discharge opeing is reclaimed; adopt present method can remove to affect various mechanical impuritys when returning discharge opeing reuse, ion and bacterium etc.; the discharge opeing performance of returning after process is made to meet reusable requirement and greatly can reduce the consumption of shale gas exploitation to water resources; realization reduces costs, the doulbe-sides' victory of protection of the environment.
The present invention realizes by adopting following technical proposals:
A kind of shale gas reuse fracturing outlet liquid treatment process, is characterized in that step is as follows:
The ion content that S1, first detection return in discharge opeing, returns discharge opeing ions content span of control respectively: K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-≤ 200mg/L, COD≤300mg/L, be considered as up to standard, and up to standard to return discharge opeing income container for subsequent use;
S2, up to standardly return discharge opeing by for subsequent use and injecting before underground carries out pressing crack construction, adopt two kinds of formulas below to carry out contrast test:
(1) the contrast clear water slippery water of new configuration: 99.9 parts of clear water or tap water+0.1 portion of friction reducer;
(2) containers for future use return discharge opeing slippery water: 99.9 parts are returned discharge opeing+0.1 portion of friction reducer;
The kinematic viscosity of kinematic viscosimeter to slippery water is adopted to evaluate, if the kinematic viscosity returning discharge opeing slippery water is not less than 90% of clear water slippery water kinematic viscosity, and return discharge opeing slippery water site operation resistance-reducing yield and reach more than 60% of clear water slippery water resistance-reducing yield to be considered as performance qualified, stratum can be injected and implement pressing crack construction, otherwise, S3 ~ S5 step need be adopted just can to continue to use to returning after reprocessing is carried out in discharge opeing;
S3, through S1 detect after return discharge opeing, its ions content is below standard, or return discharge opeing through S2 step performance inconsistency lattice, nanotechnology is all adopted to carry out filtration treatment, remove the excess ions returned in discharge opeing, return discharge opeing after treatment, metal ion should control in the scope of S1 step control;
S4, to after filtration treatment return discharge opeing resampling detect, adopt atomic absorption spectrometry carry out component detection, return discharge opeing component test item and comprise: K
+, Ca
2+, Na
+, Mg
2+, total Fe, Sr
2+, Al
3+nH
4 +, Cl
-, SO
4 2-, SRB, COD; When performance reaches K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-when≤200mg/L, COD≤300mg/L, it is qualified to be;
S5, qualified return discharge opeing by detecting and collect storage and be used for time construction of next well; If defective, secondary filtration process will be entered, until performance is qualified.
Described nanotechnology refers to and adopts filtering membrane and membrane-filtering unit to carry out filtration treatment successively.
Described filtering membrane refers to that the model that Yi Leke environmental protection science and technology (Shanghai) Co., Ltd. produces is SXN2-K-8040 nanofiltration membrane, the membrane-filtering unit being HC-MN8040-200T with the SXN2-K-8040 film model that is core that described membrane-filtering unit refers to that Chengdu and sincere filtering technique company limited produce, also known as reverse osmosis purified water equipment.
Described kinematic viscosimeter refers to that model is the kinematic viscosimeter of YDN-2.
Described friction reducer is that the name of putting on record through Administration of Quality and Technology Supervision of Sichuan Province standard is called " pressure break friction reducer (SD2-12) ", standard No. is the friction reducer of indication in the standard of Q/67579579-6.459-2011, such as, or the friction reducer that configuration slippery water conventional in this area is used, the patent No. is the friction reducer disclosed in 201310712341.7.
Described SRB specifically refers to sulphate reducing bacteria.
Described COD specifically refers to chemical oxygen demand (COD).
Compared with prior art, beneficial effect of the present invention shows:
1, present method adopts the step of S1-S5 to process returning discharge opeing, be particularly useful for stratafrac and return the process using or reclaim the rear shelf-time to be no more than 10 days immediately after discharge opeing is reclaimed, particularly in step S4, atomic absorption spectrometry is specifically adopted to carry out component detection, it is physical measure, do not introduce chemical substance, can avoid destroying the performance of liquid own; In S4 step, specifically need K
+, Ca
2+, Na
+, Mg
2+, total Fe, Sr
2+, Al
3+nH
4 +, Cl
-, SO
4 2-these projects of SRB and COD detect, very complicated because return discharge opeing composition, great majority return in discharge opeing and all contain these ions a large amount of, these ions when these ion contents exceed standard, return discharge opeing and just directly can not prepare slippery water, because can affect dispersing and dissolving performance and the resistance reducing effect of friction reducer, so must detect returning these compositions in discharge opeing, and by process, these harmful ion content are controlled in scope described in S1 and S4.In S1 and S4 step, to " K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-≤ 200mg/L, COD≤300mg/L " there is special setting concrete and detailed like this, be that any one ion content goes beyond the scope, and all can affect the performance of slippery water friction reducer because the regulation of these ion contents is drawn by indoor single factor analysis.
In sum; adopt present method can remove to affect various mechanical impuritys when returning discharge opeing reuse, ion and bacterium etc.; make the discharge opeing performance of returning after process meet reusable requirement and greatly can reduce the consumption of shale gas exploitation to water resources, realize reducing costs, the doulbe-sides' victory of protection of the environment.
2, in present method, S2 step adopts two kinds of formulas to carry out contrast test, thus can determine to reclaim use return discharge opeing slippery water, the economical effectiveness returning discharge opeing reuse is obvious, now to prepare 100m
3shale gas pressure break slippery water is that example illustrates:
The cost of clear water preparation is adopted to be about 1.5 ten thousand (formula is 0.1% friction reducer+99.9% clear water, and clear water calculates for current Chengdu tap water process water price, and tap water is bought, transportation cost 1200 yuan/train number within 30 kilometers) nearby; (8700 yuan, medicine 3000 yuan+water+other 3300 yuan).Suppose that shale gas platform stimulation work consumes slippery water 40,000 side, about 6,000 ten thousand yuan of total dosing cost.
If discharge opeing process will be returned, reach the dosing water requirement of pressure break slippery water, the processing cost of generation is about 975 yuan, process transportation cost be 1825 yuan (with 50 kilometers of transport mileages, unit price 7.5 yuan/ton of kilometers, single loading capacity 20 tons meter), the cost 8700 yuan of purchase tap water (buy nearby by tap water, transportation cost 1200 yuan/train number within 30 kilometers, one train number loads 20 tons of meters), with the cost 0.3975 ten thousand yuan (water 975 yuan+medicine 3000 yuan) returning discharge opeing preparation slippery water after process, 1.45 ten thousand yuan are reduced than the cost again buying tap water dosing generation.Suppose that shale gas platform stimulation work consumes slippery water 40,000 side, the discharge opeing of returning after all adopting process prepares slippery water, about 1,590,000 yuan of total dosing cost.5,841 ten thousand yuan are saved, cost-saving 97.35% than directly buying tap water dosing.
3, in present method, adopt nanotechnology to carry out filtration treatment in S3 step, be more because return discharge opeing intermediate ion species content, often kind of ionic diameter varies in size, need the filtering membrane of different diameter to be arranged in membrane-filtering unit to process, just can reach the filtration result of expection.
4, fracturing outlet liquid complicated component, affects by reservoir geology factor.Return containing part slippery water additive component in discharge opeing, and a large amount of stratum mineral ion, bacterium etc., clear water can not be replaced to use, more can not arrange directly outward, also should not store.Have to pass through process to reach discharging standards and just can discharge, a large amount of processing costs can be produced like this, also cause the wasting of resources.Discharge opeing will be returned suitably process, reach the level that can reuse, a large amount of tap water resource will be saved, reduce processing costs and dosing cost.
Return the reusable technique effect of discharge opeing and be mainly reflected in waste liquid can not directly use, becoming through above-mentioned treatment process can reusable liquid, reaches protection of the environment, makes full use of resource, the object of cost efficiency.Applicant spy has done contrast experiment, can learn from experimental result: before treatmently return discharge opeing in yellow or black, inside there is suspension magazine (from composition analysis result, in the positively charged ion that cannot differentiate containing a large amount of naked eyes and negatively charged ion), return discharge opeing after treatment, solution is colourless transparent liquid, and from analytical results, impact is returned the reusable ion effective content of discharge opeing and has been controlled in certain limit.
Return discharge opeing through the inventive method process, effectively can meet the extensive volume fracturing of shale gas reservoir
Construction Mode, fresh-water-saving resource, reduces the even zero release pollution of pressing crack construction operation field exhaust emission, reaches the object of cost efficiency.
Embodiment
Embodiment 1
As a better embodiment of the present invention, step of the present invention is as follows:
The ion content that S1, first detection return in discharge opeing, returns discharge opeing ions content span of control respectively: K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-≤ 200mg/L, COD≤300mg/L, be considered as up to standard, and up to standard to return discharge opeing income container for subsequent use;
S2, up to standardly return discharge opeing by for subsequent use and injecting before underground carries out pressing crack construction, adopt two kinds of formulas below to carry out contrast test:
(1) the contrast clear water slippery water of new configuration: 99.9 parts of clear water or tap water+0.1 portion of friction reducer;
(2) containers for future use return discharge opeing slippery water: 99.9 parts are returned discharge opeing+0.1 portion of friction reducer;
The kinematic viscosity of kinematic viscosimeter to slippery water is adopted to evaluate, if the kinematic viscosity returning discharge opeing slippery water is not less than 90% of clear water slippery water kinematic viscosity, and return discharge opeing slippery water site operation resistance-reducing yield and reach more than 60% of clear water slippery water resistance-reducing yield to be considered as performance qualified, stratum can be injected and implement pressing crack construction.
Adopt present method can remove to affect various mechanical impuritys when returning discharge opeing reuse, ion and bacterium etc.; the discharge opeing performance of returning after process is made to meet reusable requirement and greatly can reduce the consumption of shale gas exploitation to water resources; realization reduces costs, the doulbe-sides' victory of protection of the environment.
Embodiment 2
As preferred forms of the present invention, this programme returns discharge opeing and following process has been carried out in the below standard discharge opeing of returning of step S1 ions content to for performance in embodiment 1 step S2 is underproof:
S3, through S1 detect after return discharge opeing, its ions content is below standard, or return discharge opeing through S2 step performance inconsistency lattice, nanotechnology is all adopted to carry out filtration treatment, remove the excess ions returned in discharge opeing, return discharge opeing after treatment, metal ion should control in the scope of S1 step control;
S4, to after filtration treatment return discharge opeing resampling detect, adopt atomic absorption spectrometry carry out component detection, return discharge opeing component test item and comprise: K
+, Ca
2+, Na
+, Mg
2+, total Fe, Sr
2+, Al
3+nH
4 +, Cl
-, SO
4 2-, SRB, COD; When performance reaches K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-when≤200mg/L, COD≤300mg/L, it is qualified to be;
S5, qualified return discharge opeing by detecting and collect storage and be used for time construction of next well; If defective, secondary filtration process will be entered, until performance is qualified.
Described nanotechnology refers to and adopts filtering membrane and membrane-filtering unit to carry out filtration treatment successively.
Described filtering membrane refers to that the model that Yi Leke environmental protection science and technology (Shanghai) Co., Ltd. produces is SXN2-K-8040 nanofiltration membrane, the membrane-filtering unit being HC-MN8040-200T with the SXN2-K-8040 film model that is core that described membrane-filtering unit refers to that Chengdu and sincere filtering technique company limited produce, also known as reverse osmosis purified water equipment.
Described kinematic viscosimeter refers to that model is the kinematic viscosimeter of YDN-2.
Described friction reducer is that the name of putting on record through Administration of Quality and Technology Supervision of Sichuan Province standard is called " pressure break friction reducer (SD2-12) ", standard No. is the friction reducer of indication in the standard of Q/67579579-6.459-2011, such as, or the friction reducer that configuration slippery water conventional in this area is used, the patent No. is the friction reducer disclosed in 201310712341.7.
Described SRB specifically refers to sulphate reducing bacteria.
Described COD specifically refers to chemical oxygen demand (COD).
Fracturing outlet liquid complicated component, affects by reservoir geology factor.Return containing part slippery water additive component in discharge opeing, and a large amount of stratum mineral ion, bacterium etc., clear water can not be replaced to use, more can not arrange directly outward, also should not store.Have to pass through process to reach discharging standards and just can discharge, a large amount of processing costs can be produced like this, also cause the wasting of resources.Discharge opeing will be returned suitably process, reach the level that can reuse, a large amount of tap water resource will be saved, reduce processing costs and dosing cost.
Return the reusable technique effect of discharge opeing and be mainly reflected in waste liquid can not directly use, becoming through above-mentioned treatment process can reusable liquid, reaches protection of the environment, makes full use of resource, the object of cost efficiency.Applicant spy has done contrast experiment, can learn from experimental result: before treatmently return discharge opeing in yellow or black, inside there is suspension magazine (from composition analysis result, in the positively charged ion that cannot differentiate containing a large amount of naked eyes and negatively charged ion), return discharge opeing after treatment, solution is colourless transparent liquid, and from analytical results, impact is returned the reusable ion effective content of discharge opeing and has been controlled in certain limit.
Return discharge opeing through the inventive method process, effectively can meet the extensive volume fracturing of shale gas reservoir
Construction Mode, fresh-water-saving resource, reduces the even zero release pollution of pressing crack construction operation field exhaust emission, reaches the object of cost efficiency.
Claims (3)
1. a shale gas reuse fracturing outlet liquid treatment process, is characterized in that step is as follows:
The ion content that S1, first detection return in discharge opeing, returns discharge opeing ions content span of control respectively: K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-≤ 200mg/L, COD≤300mg/L, be considered as up to standard, and up to standard to return discharge opeing income container for subsequent use;
S2, up to standardly return discharge opeing by for subsequent use and injecting before underground carries out pressing crack construction, adopt two kinds of formulas below to carry out contrast test:
(1) the contrast clear water slippery water of new configuration: 99.9 parts of clear water or tap water+0.1 portion of friction reducer;
(2) containers for future use return discharge opeing slippery water: 99.9 parts are returned discharge opeing+0.1 portion of friction reducer;
The kinematic viscosity of kinematic viscosimeter to slippery water is adopted to evaluate, if the kinematic viscosity returning discharge opeing slippery water is not less than 90% of clear water slippery water kinematic viscosity, and return discharge opeing slippery water site operation resistance-reducing yield and reach more than 60% of clear water slippery water resistance-reducing yield to be considered as performance qualified, stratum can be injected and implement pressing crack construction, otherwise, S3 ~ S5 step need be adopted just can to continue to use to returning after reprocessing is carried out in discharge opeing;
S3, through S1 detect after return discharge opeing, its ions content is below standard, or return discharge opeing through S2 step performance inconsistency lattice, nanotechnology is all adopted to carry out filtration treatment, remove the excess ions returned in discharge opeing, return discharge opeing after treatment, metal ion should control in the scope of S1 step control;
S4, to after filtration treatment return discharge opeing resampling detect, adopt atomic absorption spectrometry carry out component detection, return discharge opeing component test item and comprise: K
+, Ca
2+, Na
+, Mg
2+, total Fe, Sr
2+, Al
3+nH
4 +, Cl
-, SO
4 2-, SRB, COD; When performance reaches K
+≤ 1500mg/L, Ca
2+≤ 600mg/L, Na
+≤ 2000mg/L, Mg
2+≤ 1000mg/L, NH
4 +≤ 600mg/L, total Fe≤25mg/L, Cl
-≤ 3000mg/L, Al
3+≤ 30mg/L, SO
4 2-when≤200mg/L, COD≤300mg/L, it is qualified to be;
S5, qualified return discharge opeing by detecting and collect storage and be used for time construction of next well; If defective, secondary filtration process will be entered, until performance is qualified.
2. shale gas reuse fracturing outlet liquid treatment process according to claim 1, is characterized in that: described nanotechnology refers to and adopts filtering membrane and membrane-filtering unit to carry out filtration treatment successively.
3. shale gas reuse fracturing outlet liquid treatment process according to claim 1, is characterized in that: described kinematic viscosimeter refers to that model is the kinematic viscosimeter of YDN-2.
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| CN112679020B (en) * | 2020-12-25 | 2022-05-03 | 成都硕特科技股份有限公司 | Low-cost shale gas fracturing flowback fluid treatment system and treatment method |
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