CN106916249A - A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling - Google Patents
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling Download PDFInfo
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- CN106916249A CN106916249A CN201710133470.9A CN201710133470A CN106916249A CN 106916249 A CN106916249 A CN 106916249A CN 201710133470 A CN201710133470 A CN 201710133470A CN 106916249 A CN106916249 A CN 106916249A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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Abstract
The present invention provides a kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, this includes the acrylamide that mass concentration is 5.00~7.00%, the N that mass concentration is 0.50~0.70%, the sodium ferricyanide that ammonium persulfate that N methylene-bisacrylamides, mass concentration are 0.40~0.60%, mass concentration are 0.06~0.10%；Balance of water.The blocking agent of low temperature high salinity reservoir of the invention is applicable to the water plugging and profile controlling construction of low temperature high salinity reservoir, improves recovery ratio.The gel plugging agent that the present invention is provided is under low temperature high salt conditions, gelation time is controllable at 18~62 hours, formation gel strength E~I ranks are adjustable, immobilising high intensity frozen glue can be formed at low temperature, and high salt conditions stability inferior is good, plugging strength is high, and effectively closure can be formed to high permeability formation or predominant pathway, improves recovery ratio effect is significant.
Description
Technical field
The invention belongs to the chemicals technical field of field use, and in particular to a kind of stifled suitable for low temperature high salinity reservoir
The blocking agent of water profile control.
Technical background
Current China's major part oil field using waterflooding extraction by the way of, with the entrance of oil field, the rear development phase, stratum is non-
Homogenieity is aggravated, and many oil fields enter high water-cut stage, and the serious even water logging of well water has had a strong impact on field output.Therefore
Water and oil control, raising recovery ratio have become the significant challenge that current China oil field faces.
In numerous water and oil control measures, chemistry controls water because working measure is simple, good selective is most paid attention to,
Wherein polymer gel blocking agent is because cost is relatively low, configuration simple, sealed depth and intensity controlled obtain most commonly used research
With application.Such as Chinese invention patent of Publication No. CN103980872A provides a kind of environment friend suitable for low-temperature reservoir
Good type gel plugging agent, the blocking agent is by amphiprotic polyacrylamide 0.2~0.6%, organic zirconium crosslinker 0.5%~2.0% and remaining
Amount water composition.The gel plugging agent can at low temperature form immobilising high intensity jelly system, can be used for 25~35 DEG C of low-temperature oils
The deep water plugging and profile controlling construction of Tibetan, improves oil recovery factor.The Chinese invention patent of Publication No. CN104910883A is provided
One kind postpone crosslinking chromium gel profile-controlling and plugging agent, the blocking agent be by 0.3~0.8% partially hydrolyzed polyacrylamide (PHPA), 0.02~
0.20% sodium dichromate, 0.15~0.50% additive and excess water composition, the frozen glue can form high intensity at a lower temperature
Frozen glue, its sealing ratiod is high, flushing resistance is good.But above-mentioned jelly system is mostly that multinuclear ol bridge is formed in water by metal ion
In complex ion and polymer molecule-COO-The crosslinked being cross-linked to form, such gel plugging agent multinuclear ol bridge under high salt conditions
Complex ion is destroyed, and causes stability poor, a large amount of dehydrations, therefore cannot be applied to high salinity reservoir.Publication No.
The patent application of CN103232839A is suitable to the blocking agent of high temperature and high salt oil deposit water plugging and profile controlling there is provided a kind of, and the blocking agent is by leading
Agent, crosslinking agent, stabilizer and water composition, host are sulfonation mimosa extract or sodium humate；Crosslinking agent is that aldehyde crosslinking agent and phenols are handed over
Join the combination of agent；Stabilizer is waterglass and non-ionic polyacrylamide.The blocking agent that the invention is related to is applicable to 90~150
DEG C, salinity be more than 2.0 × 105The oil reservoir water plugging and profile controlling of mg/L, gelation time, gelation intensity is adjustable, and plugging effect is good.But should
Frozen glue under cryogenic cannot plastic, therefore be not used to low-temperature reservoir.China's application of Publication No. CN104194754A
There is provided a kind of temperature-resistant and anti-salt type HPAM/Cr3+/ phenolic aldehyde composite crosslinking Weak Gels profile-controlling and plugging agent and preparation method thereof, the frozen glue
Higher-strength frozen glue can be formed in 60~90 DEG C of temperature range, good stability can be formed with effect closure, and salt tolerant to stratum
Effect preferably, but the frozen glue at low temperature (be less than 60 DEG C) plastic effect difference even cannot plastic, be not suitable for low-temperature reservoir.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling,
With in solving the problems, such as low temperature high salinity reservoir water plugging and profile controlling operation.
Blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling provided by the present invention, this includes mass concentration and is
5.00~7.00% acrylamide, the N,N methylene bis acrylamide that mass concentration is 0.50~0.70%, mass concentration
Ammonium persulfate, the sodium ferricyanide that mass concentration is 0.06~0.10% for 0.40~0.60%；Balance of water.
One kind as embodiment is preferred, blocking agent of the invention, and its one kind composition is as follows：Acrylamide 5.00%, N, N-
Methylene-bisacrylamide 0.50%, ammonium persulfate 0.40%, the sodium ferricyanide 0.10%, water 94.00%.
One kind as embodiment is preferred, and the composition of blocking agent of the invention is as follows：Acrylamide 6.00%, N, N- methylene
Bisacrylamide 0.60%, ammonium persulfate 0.50%, the sodium ferricyanide 0.08%, water 92.82%.
Another kind as embodiment is preferred, and the composition of blocking agent of the invention is as follows：Acrylamide 7.00%, N, N- methylenes
Base bisacrylamide 0.70%, ammonium persulfate 0.60%, the sodium ferricyanide 0.06%, water 91.64%.
A kind of blocking agent that the present invention is provided, its preparation method is as follows：
1) by mass percentage to acrylamide is added in water while stirring, 1~2h is persistently stirred, to being completely dissolved, is obtained
To acrylamide solution；
2) to step 1) N,N methylene bis acrylamide, over cure are sequentially added according to mass percent in the solution that obtains
Sour ammonium and the sodium ferricyanide, stirring resulting solution are blocking agent into glue；
3) by step 2) blocking agent that obtains is liquid-tight is honored as a queen, and is placed in aging in baking oven, obtains the blocking agent.
The blocking agent that the present invention is provided can be used for the water plugging and profile controlling operation of low temperature high salinity reservoir；
Described low temperature high salinity reservoir, its one kind is specifically：30~60 DEG C of temperature, salinity higher than 2.0 ×
105mg/L。
Gel plugging agent provided by the present invention has remarkable advantage, and it is good to meet cryogenic conditions plastic effect, and high salt bar
The good requirement of part stability inferior.Gel plugging agent excellent performance provided by the present invention, in low temperature high salt (30~60 DEG C of temperature, ore deposit
Change degree is higher than 2.0 × 105Mg/L plastic effect is good under the conditions of), intensity is high, and good stability, without dehydration, broken after stablizing 90 days
Glue.Effectively closure can be formed to low temperature high salinity reservoir High water cut stratum, sealing ratiod is high, improve sweep efficiency, and then improve harvesting
Rate.And gelation time is controllable, gelation intensity is adjustable, low into gelatin viscosity, easily injection, can meet the water blockoff of low temperature high salinity reservoir
The requirement of construction.
Brief description of the drawings
Fig. 1：The photo of frozen glue aging of product 10d in embodiment 4；
Fig. 2：Photo in embodiment 4 after frozen glue aging of product 90d；
Fig. 3：Shut-off capacity physical simulation experiment device schematic diagram in embodiment 5；
Fig. 4：Recovery ratio ability physical simulation experiment device schematic diagram is improved in embodiment 6；
Fig. 5：The recovery ratio curve of embodiment 6.
In figure：1. constant-flux pump, 2. six-way valve, 3. pharmacy jar, 4. water pot, 5. oil tank, 6. precision pressure gauge, 7. high permeability
Fill out sand tube, 8. low-permeability fill out sand tube, 9. valve, 10. graduated cylinder.
Specific embodiment
Applicant's discovery during using existing blocking agent, when for low temperature high salinity reservoir water plugging and profile controlling operation,
The salt stability of some low temperature jelly systems is poor；And existing heat-resistant salt-resistant jelly system is high due to temperature required for plastic,
Cause the low temperature plastic effect of these jelly systems poor, or even cannot plastic.Therefore, applicant have developed a kind of suitable for low temperature
(temperature is less than 60 DEG C to high salinity reservoir, and salinity is higher than 2.0 × 105Mg/L) the blocking agent of water plugging and profile controlling, due to the jelly system
It is that, with acrylamide monomer as host, energy needed for the cross-linking reaction between monomer and crosslinking agent is low.Therefore, the frozen glue body of research and development
System disclosure satisfy that the requirement that plastic effect is good, high salt conditions stability inferior is good under cryogenic conditions, so as to improve low temperature high salt high salt
Class oil recovery.
In following examples, water used is high salinity, high hardness water：Total salinity 2.5 × 105Mg/L, Ca2+、Mg2+From
Sub- concentration 5000mg/L.
In following examples, gel strength is evaluated using gel strength code method.Grade classification table is shown in Table 1.
The gel strength grade classification table of table 1
Embodiment 1
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, mass percent constitutes and is：Acrylamide
5.00%th, N,N methylene bis acrylamide 0.50%, ammonium persulfate 0.40%, the sodium ferricyanide 0.10% and water 94.00%.Respectively
Constituent mass is：
Acrylamide 5.00g；
N,N methylene bis acrylamide 0.50g；
Ammonium persulfate 0.40g；
Sodium ferricyanide 0.10g；
Water 94.00g.
Its preparation method is as follows：
(1) 94.00g water, is taken, while stirring to 5.00g acrylamides are added in water, 1~2h is persistently stirred, propylene is obtained
Amide solution；
(2) N,N methylene bis acrylamide 0.50g, ammonium persulfate 0.40g and iron cyanogen and then are while stirring slowly added to
Change sodium 0.10g, persistently stir 0.5h, obtain blocking agent into glue；
(3), the blocking agent is placed in multiple ampoule bottles into glue, with alcolhol burner sinter sealing after, be respectively placed in 30 DEG C, 40
DEG C, 50 DEG C, in 60 DEG C of baking ovens；
The gel plugging agent of the present embodiment is investigated in low temperature high salt (temperature：30~60 DEG C, total salinity 2.5 × 105Mg/L,
Ca2+、Mg2+Ion concentration 5000mg/L) under the conditions of gel-forming property, the results are shown in Table 2.
Table 2：Gel-forming property of the gel plugging agent of embodiment 1 under low temperature high salt conditions
| Temperature | 30℃ | 40℃ | 50℃ | 60℃ |
| Gelation time | 62h | 50h | 42h | 36h |
| Gelling strength | E ranks | F ranks | F ranks | G ranks |
Result shows that gel plugging agent manufactured in the present embodiment has preferable plastic effect under low temperature high salt conditions, into
36~62 hours glue time, gelling strength E~G ranks.
Embodiment 2
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, mass percent constitutes and is：Acrylamide
6.00%th, N,N methylene bis acrylamide 0.60%, ammonium persulfate 0.50%, the sodium ferricyanide 0.08% and water 92.82%.Respectively
Constituent mass is：
Acrylamide 6.00g；
N,N methylene bis acrylamide 0.60g；
Ammonium persulfate 0.50g；
Sodium ferricyanide 0.08g；
Water 92.82g.
Its preparation method is as follows：
(1) 92.82g water, is taken, while stirring to 6.00g acrylamides are added in water, 1~2h is persistently stirred, propylene is obtained
Amide solution；
(2) N,N methylene bis acrylamide 0.60g, ammonium persulfate 0.50g and iron cyanogen and then are while stirring slowly added to
Change sodium 0.08g, persistently stir 0.5h, obtain blocking agent into glue；
(3), the blocking agent is placed in multiple ampoule bottles into glue, with alcolhol burner sinter sealing after, be respectively placed in 30 DEG C, 40
DEG C, 50 DEG C, in 60 DEG C of baking ovens；
Gel-forming property of the gel plugging agent of the present embodiment under low temperature high salt conditions is investigated, 3 are the results are shown in Table.
Table 3：Gel-forming property of the gel plugging agent of embodiment 2 under low temperature high salt conditions
| Temperature | 30℃ | 40℃ | 50℃ | 60℃ |
| Gelation time | 52h | 40h | 30h | 24h |
| Gelling strength | F ranks | F ranks | G ranks | H ranks |
Result shows that gel plugging agent manufactured in the present embodiment has good plastic effect under low temperature high salt conditions, into
24~52 hours glue time, gelling strength F~H ranks.
Embodiment 3
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, mass percent constitutes and is：Acrylamide
7.00%th, N,N methylene bis acrylamide 0.70%, ammonium persulfate 0.60%, the sodium ferricyanide 0.06% and water 91.64%.Respectively
Constituent mass is：
Acrylamide 7.00g；
N,N methylene bis acrylamide 0.70g；
Ammonium persulfate 0.60g；
Sodium ferricyanide 0.06g；
Water 91.64g.
Its preparation method is as follows：
(1) 91.64g water, is taken, while stirring to 7.00g acrylamides are added in water, 1~2h is persistently stirred, propylene is obtained
Amide solution；
(2) N,N methylene bis acrylamide 0.70g, ammonium persulfate 0.60g and iron cyanogen and then are while stirring slowly added to
Change sodium 0.06g, persistently stir 0.5h, obtain blocking agent into glue；
(3), the blocking agent is placed in multiple ampoule bottles into glue, with alcolhol burner sinter sealing after, be respectively placed in 30 DEG C, 40
DEG C, 50 DEG C, in 60 DEG C of baking ovens；
Gel-forming property of the gel plugging agent of the present embodiment under low temperature high salt conditions is investigated, 4 are the results are shown in Table.
Table 4：Gel-forming property of the gel plugging agent of embodiment 3 under low temperature high salt conditions
| Temperature | 30℃ | 40℃ | 50℃ | 60℃ |
| Gelation time | 44h | 32h | 24h | 18h |
| Gelling strength | G ranks | G ranks | H ranks | I ranks |
Result shows that the gel plugging agent of the present embodiment has good plastic effect under low temperature high salt conditions, during plastic
Between 18~44 hours, gelling strength G~I ranks.
Embodiment 4：Investigate stability of the gel plugging agent of the present invention under high salt conditions
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, mass percent constitutes and is：Acrylamide
6.00%th, N,N methylene bis acrylamide 0.60%, ammonium persulfate 0.50%, the sodium ferricyanide 0.08% and water 92.82%.Respectively
Constituent mass is：
Acrylamide 6.00g；
N,N methylene bis acrylamide 0.60g；
Ammonium persulfate 0.50g；
Sodium ferricyanide 0.08g；
Water 92.82g.
Its preparation method is as follows：
(1) 92.82g water, is taken, while stirring to 6.00g acrylamides are added in water, 1~2h is persistently stirred, propylene is obtained
Amide solution；
(2) N,N methylene bis acrylamide 0.60g, ammonium persulfate 0.50g and iron cyanogen and then are while stirring slowly added to
Change sodium 0.08g, persistently stir 0.5h, obtain blocking agent into glue；
(3), the blocking agent is placed in ampoule bottle into glue, after sintering sealing with alcolhol burner, is placed in 60 DEG C of baking ovens；
Frozen glue is placed in 60 DEG C of baking ovens aging for a long time, the regular Strength Changes and dehydrating amount for investigating gel plugging agent.It is real
Test and the results are shown in Table 5 and Fig. 1,2.
Table 5：Gel plugging agent high salt conditions stability inferior result of the present invention
| The investigation time | 10 days | 20 days | 30 days | 50 days | 70 days | 90 days |
| Intensity | H ranks | H ranks | H ranks | H ranks | H ranks | H ranks |
| Dehydrating amount | Without dehydration | Without dehydration | Without dehydration | Without dehydration | Micro dehydration | Micro dehydration |
From result, the gel plugging agent prepared using high salinity, high hardness water, after long-time is aging, intensity is constant,
Almost without dehydration.Illustrate that gel plugging agent of the invention has good stability under high salt conditions.
Embodiment 5：Investigate the shut-off capacity of gel plugging agent of the present invention
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, mass percent constitutes and is：Acrylamide
6.00%th, N,N methylene bis acrylamide 0.60%, ammonium persulfate 0.50%, the sodium ferricyanide 0.08% and water 92.82%.Respectively
Constituent mass is：
Acrylamide 6.00g；
N,N methylene bis acrylamide 0.60g；
Ammonium persulfate 0.50g；
Sodium ferricyanide 0.08g；
Water 92.82g.
Its preparation method is as follows：
(1) 92.82g water, is taken, while stirring to 6.00g acrylamides are added in water, 1~2h is persistently stirred, propylene is obtained
Amide solution；
(2) N,N methylene bis acrylamide 0.60g, ammonium persulfate 0.50g and iron cyanogen and then are while stirring slowly added to
Change sodium 0.08g, persistently stir 0.5h, obtain blocking agent into glue；
Using the blocking agent of above-mentioned preparation into glue, the shut-off capacity of gel plugging agent is investigated, experimental provision schematic diagram such as Fig. 3,
Experimental procedure is as follows：
(1), by 20cm long, the fill out sand tube of internal diameter 2.5cm filling gravel simulates oil reservoir high permeability zone, and by fill out sand tube
Vacuumize, saturated brine；
(2), with salt solution water drive to pressure stability, the original permeability for measuring fill out sand tube (is designated as k1)；
(3), will prepare into glue inverse injection fill out sand tube, injection rate is 0.3PV (fill out sand tube pore volume), is then used
0.1PV salt solution is replaced.Then fill out sand tube is placed in aging 48h in 50 DEG C of baking ovens, Hou Ning plastics；
(4) sequent water flooding to pressure stability, is carried out, permeability (is designated as k after determining back-up sand pipe plug2), according to formula E=
(k1-k2)/k1, it is calculated sealing ratiod E.The results are shown in Table 6.
Table 6：The shut-off capacity of gel plugging agent of the present invention
| Sealing ratiod (E/%) | ||
| 3.80 | 0.03 | 99.2 |
Result shows that the gel plugging agent that the present invention is provided has very strong shut-off capacity under low temperature high salt conditions, low
High permeability zone or macropore can effectively be blocked in warm high salinity reservoir construction.
Embodiment 6：Investigate the raising recovery ratio ability of gel plugging agent of the present invention
A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, mass percent constitutes and is：Acrylamide
6.00%th, N,N methylene bis acrylamide 0.60%, ammonium persulfate 0.50%, the sodium ferricyanide 0.08% and water 92.82%.Respectively
Constituent mass is：
Acrylamide 6.00g；
N,N methylene bis acrylamide 0.60g；
Ammonium persulfate 0.50g；
Sodium ferricyanide 0.08g；
Water 92.82g.
Its preparation method is as follows：
(1) 92.82g water, is taken, while stirring to 6.00g acrylamides are added in water, 1~2h is persistently stirred, propylene is obtained
Amide solution；
(2) N,N methylene bis acrylamide 0.60g, ammonium persulfate 0.50g and iron cyanogen and then are while stirring slowly added to
Change sodium 0.08g, persistently stir 0.5h, obtain blocking agent into glue；
Using the blocking agent of above-mentioned preparation into glue, the raising recovery ratio ability of gel plugging agent, experimental provision schematic diagram are investigated
Such as Fig. 4, experimental procedure is as follows：
(1), back-up sand pipe range 20cm, internal diameter 2.5cm, respectively with low mesh number (60~80 mesh) and high mesh number (100~120 mesh)
Gravel fill out sand tube, simulates oil reservoir high-permeability reservoir and low permeability formation, and fill out sand tube is vacuumized, saturated salt respectively
Water；
(2), with brine displacements fill out sand tube to steady pressure, measure is high and low to ooze fill out sand tube permeability；
(3), saturation crude oil：By fill out sand tube saturation crude oil, until outlet section production fluid be all crude oil (injection rate by
0.05ml/L gradually rises to 1mL/min).Record saturation crude oil volume, calculates oil saturation.The fill out sand tube of saturation crude oil is put
The aging 48h in 50 DEG C of baking ovens；
(4), water drive：High and low with the parallel connection of 1mL/min speed water drive oozes fill out sand tube, record production fluid volume, output crude oil
Volume and output water volume, until production fluid moisture content is 98%, calculate water drive oil recovery factor；
(5), into glue, injection cumulative volume is 0.3PV (high permeability fill out sand tube pore volume) to inverse injection gel plugging agent,
Then 0.1PV brine displacements are used.The high and low fill out sand tube that oozes in parallel is placed in Hou Ning 48h plastics in 50 DEG C of baking ovens；
(6), sequent water flooding：High and low with the parallel connection of 1mL/min speed water drive oozes fill out sand tube, record production fluid volume, output
Crude oil volume and output water volume, until production fluid moisture content reaches 98%, the increment of calculated for subsequent water drive oil recovery factor again.
Experimental result is shown in Fig. 5, and after as a result showing injection gel plugging agent, hypotonic fill out sand tube recovery ratio substantially increases, remaining oil
It is plucked out of, recovery ratio is rised in value up to 37.8%, illustrates that gel plugging agent of the invention can effectively block Thief zone water outlet advantage and lead to
Road, improves sweep efficiency, and then effectively improve recovery ratio.
Claims (8)
1. a kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling, it is characterised in that described blocking agent includes quality
N,N methylene bis acrylamide, matter that acrylamide that concentration is 5.00~7.00%, mass concentration are 0.50~0.70%
Amount concentration is 0.40~0.60% ammonium persulfate, the sodium ferricyanide that mass concentration is 0.06~0.10%；Balance of water.
2. blocking agent as claimed in claim 1, it is characterised in that the composition of described blocking agent is as follows：Acrylamide 5.00%, N,
N- methylene-bisacrylamides 0.50%, ammonium persulfate 0.40%, the sodium ferricyanide 0.10%, water 94.00%.
3. blocking agent as claimed in claim 1, it is characterised in that the composition of described blocking agent is as follows：Acrylamide 6.00%, N,
N- methylene-bisacrylamides 0.60%, ammonium persulfate 0.50%, the sodium ferricyanide 0.08%, water 92.82%.
4. blocking agent as claimed in claim 1, it is characterised in that the composition of described blocking agent is as follows：Acrylamide 7.00%, N,
N- methylene-bisacrylamides 0.70%, ammonium persulfate 0.60%, the sodium ferricyanide 0.06%, water 91.64%.
5. the preparation method of the blocking agent described in claim 1, it is characterised in that as follows the step of described method：
1) by mass percentage to acrylamide is added in water while stirring, 1~2h is persistently stirred, to being completely dissolved, obtains third
Acrylamide solution；
2) to step 1) N,N methylene bis acrylamide, ammonium persulfate are sequentially added according to mass percent in the solution that obtains
And the sodium ferricyanide, stir resulting solution and be blocking agent into glue；
3) by step 2) blocking agent that obtains is liquid-tight is honored as a queen, and is placed in aging in baking oven, obtains the blocking agent.
6. application of the blocking agent described in claim 1 in the water plugging and profile controlling operation of low temperature high salinity reservoir.
7. application as claimed in claim 6, it is characterised in that the temperature of described low temperature is 30~60 DEG C.
8. application as claimed in claim 6, it is characterised in that described high salt, is that salinity is higher than 2.0 × 105mg/L。
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| CN201710133470.9A CN106916249A (en) | 2017-03-08 | 2017-03-08 | A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling |
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| CN201710133470.9A CN106916249A (en) | 2017-03-08 | 2017-03-08 | A kind of blocking agent suitable for low temperature high salinity reservoir water plugging and profile controlling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10414969B2 (en) | 2018-02-09 | 2019-09-17 | China University Of Petroleum (East China) | Colloidal nano-graphite-strengthened bulk gel system for dispersed particle gel and composition thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10414969B2 (en) | 2018-02-09 | 2019-09-17 | China University Of Petroleum (East China) | Colloidal nano-graphite-strengthened bulk gel system for dispersed particle gel and composition thereof |
| CN113913168A (en) * | 2020-07-09 | 2022-01-11 | 中国石油化工股份有限公司 | Low-temperature high-salt-resistant deep profile control and flooding crosslinking system and preparation method and application thereof |
| CN113913168B (en) * | 2020-07-09 | 2023-08-08 | 中国石油化工股份有限公司 | Low-temperature high-salt-resistant deep profile control and flooding crosslinking system and preparation method and application thereof |
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