CN110003870A - A kind of pressure break degradable water dissolubility diverting agent and preparation method thereof - Google Patents
A kind of pressure break degradable water dissolubility diverting agent and preparation method thereof Download PDFInfo
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- CN110003870A CN110003870A CN201910392863.0A CN201910392863A CN110003870A CN 110003870 A CN110003870 A CN 110003870A CN 201910392863 A CN201910392863 A CN 201910392863A CN 110003870 A CN110003870 A CN 110003870A
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Abstract
The invention discloses a kind of pressure break degradable water dissolubility diverting agents, the diverting agent is prepared by the raw material of following mass percent: acrylamide 10~30%, acrylic acid 10~20%, bentonite 5~10%, starch 5~10%, sulfonated gilsonite 5~10%, 2- acrylamide-2-methyl propane sulfonic 5~10%, crosslinking agent account for the 0.01~0.05% of monomer mass, initiator and account for the 0.4~0.8% of monomer mass, and surplus is distilled water.Diverting agent of the invention enters in bottom crack with fracturing fluid, in carrying process and reaches in short time in crack, water swelling and toughness is fine, counterincision is sewed with good plugging action.And in the short time, due to stratum high-temperature, diverting agent can voluntarily degrade, to reach temporarily stifled effect well.And preparation method of the invention is simple, cost of material is low and comparatively safe.
Description
Technical field
The invention belongs to the technical fields of material, and in particular to a kind of pressure break degradable water dissolubility diverting agent and its preparation
Method.
Background technique
Petroleum plays a significant role as the efficient energy in world economy.And the average oil recovery in the whole world down to
34%, the life for extending mature oilfield reservoir is one of primary goal of energy industry.The exploration of petroleum is become more in recent years
Add difficulty, this makes us, and it is necessary to improve the tar productivity of petroleum.
With the fast development of China's economy and society, the petroleum valuable source indispensable and non-renewable as one kind,
In occupation of very important status.In petroleum industry and petroleum industry technology gradually development process, the scholars that go in for the study
Also face the problem of some sternnesses: firstly, since Chinese population is numerous, oil demand amount is quicklyd increase, and oilfield exploitation quantity
It is limited, so that supply falls short of demand；Secondly, petroleum industry technology is advanced not enough, cause the petroleum largely remained in depleted reservoir
Fail full extraction to come out.It can be seen that using petroleum resources in order to more permanent, it would be desirable to accomplish scientific and reasonable
Using, improve petroleum industry technology with achieve the purpose that improve production efficiency.
And oilfield exploitation dynamics increasingly increases, oily resource enters the deficient phase.Enter stage middle and later periods, oil well in oil exploitation
Water content is almost up to 99% or more.Therefore, people are gradually by oil recovery target diversion to the secondary of water injection well and hyposmosis oil well
Even repeatedly in exploitation.
To increase oil extraction amount, chemical temporary blocking agent is widely used in oilfield construction production.Meghan et al. was once
It points out: exploitation purpose being oriented to less permeable layer or oil production can be increased to the method for high permeability zone selective shut-off.
Currently, acid, alkalinity and oil diverting agent are relatively more, water-soluble diverting agent type is few.And it is short without a kind of energy
The degradable water insoluble chemical diverting agent that time blocks.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of pressure break degradable water dissolubility diverting agents and its preparation
Method.The chemical temporary blocking agent is low cost, environmental protection and the water-soluble diverting agent that can voluntarily degrade after mining.
Technical scheme is as follows:
The present invention provides a kind of pressure break degradable water dissolubility diverting agent, the diverting agent by following mass percent original
Material prepares: acrylamide 10~30%, acrylic acid 10~20%, bentonite 5~10%, starch 5~10%, sulfonated gilsonite
5~10%, 2- acrylamide-2-methyl propane sulfonic 5~10%, crosslinking agent 0.1~1%, initiator 4~8%, surplus are distillation
Water.
The present invention is directed to construction site demand, develops a kind of low cost, environmental protection and after mining can voluntarily degrade
Water-soluble diverting agent.The diverting agent relies primarily on local environment temperature and controls itself degradability in water.When temperature is lower than drop
When solving temperature, diverting agent can form stable temporary stifled band in Thief zone area；After the completion of measure, with the recovery of formation temperature,
When reaching degradation temperature, diverting agent can decompose in water flooding completely and realize de-plugging.
For acrylamide and acrylic acid of the invention under the action of crosslinking agent, initiator, crosslinking generates tridimensional network,
It blocks in basal crack area.As main reaction monomer, the amide groups and carboxyl contained makes diverting agent for acrylamide and acrylic acid
With strong absorptive；For 2- acrylamide-2-methyl propane sulfonic as auxiliary reaction monomers, it is short that the sulfonic group contained increases diverting agent
Heat-resistant salt-resistant in time；Bentonite, starch and sulfonated gilsonite as filler, increase diverting agent water absorbing properties and
Brittleness, to accelerate to degrade.Bentonite, starch molecular structure on the hydroxyl group that contains, sulfonated gilsonite contains sulfonic group, hydroxyl
Base, sulfonic group can form a kind of physical crosslinking with the hydrogen bond in water, to increase the water absorbing properties of diverting agent, therefore be conducive to temporarily
The degradation of blocking agent.
Further, the bentonite is at least one of sodium bentonite, calcium-base bentonite.
Further, the starch is at least one of tapioca starch, cornstarch, potato starch.
Further, the crosslinking agent is polyethyleneglycol diacrylate (PEGDA), N, N '-methylene-bisacrylamide
At least one of (NMBA).
Further, the initiator is potassium peroxydisulfate/anhydrous sodium sulfite, ammonium persulfate/sodium hydrogensulfite, tert-butyl
One of hydrogen peroxide/sodium pyrosulfite, hydrogen peroxide/tartaric acid combination.
The present invention, to the selection and dosage of crosslinking agent and initiator, is true by a large amount of screening experiments from the selection of monomer
It is fixed, therefore the degradable water dissolubility diverting agent prepared is had excellent performance.
The present invention also provides a kind of method for preparing the pressure break degradable water dissolubility diverting agent, this method includes
Following steps:
(1) water and starch mixing are added in the reaction vessel, acrylic acid is then added and mixes；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, bentonite, sulphur are added in step (1) acquired solution
Change pitch, heating stirring is uniform after ultrasonic disperse；
(3) crosslinking agent is added in step (2) acquired solution, initiator carries out polymerization reaction；
(4) cooling is stood, drying is after polymeric shear is granulated to get the diverting agent.
Further, in step (1), the sodium hydroxide solution that mass percent is 20~30% is added, adjusts solution
PH value is 5~6.
Further, in step (2), in the case where frequency is 30-50Hz, ultrasonic disperse handles 10~15min.So that solution is mixed
It closes more uniform.
Further, in step (3), the temperature of polymerization reaction is 45~55 DEG C, and the time is 20~30min.
The invention has the benefit that diverting agent of the invention enters in bottom crack with fracturing fluid, in carrying process
And reach in short time in crack, water swelling and toughness is fine, counterincision is sewed with good plugging action；And in the short time,
Due to stratum high-temperature, diverting agent can voluntarily degrade, to reach temporarily stifled effect well.And preparation method of the invention is simple,
Cost of material is low and comparatively safe.
Detailed description of the invention
Fig. 1 is the influence of the type and dosage of crosslinking agent of the present invention to diverting agent water absorbent rate；
Fig. 2 is the influence of the type and dosage of crosslinking agent of the present invention to diverting agent degradation time；
Fig. 3 is that the present invention schemes that the SEM of the diverting agent of sulfonated gilsonite is not added；
Fig. 4 is the present invention in the SEM figure that the diverting agent of sulfonated gilsonite is added；
Fig. 5 is the infrared spectrogram of diverting agent calcium-base bentonite and other components of the present invention；
A: calcium-base bentonite；B: the diverting agent containing calcium-base bentonite；C: the diverting agent without calcium-base bentonite；
Fig. 6 is pressue-graph of the diverting agent of the present invention in reservoir core plugging.
Specific embodiment
The present invention is carried out below with reference to embodiment and attached drawing explanation is explained in detail.
Embodiment 1
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 10%, third
Olefin(e) acid 10%, sodium bentonite 5%, tapioca starch 5%, sulfonated gilsonite 5%, 2- acrylamide-2-methyl propane sulfonic 10%, poly- second
Omega-diol diacrylate 0.1%, potassium peroxydisulfate 2.2%, anhydrous sodium sulfite 1.8%, surplus are distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and tapioca starch mixing are added in the reaction vessel, the rear acrylic acid that is added mixes, and mass percent is then added
PH value for 20% sodium hydroxide solution adjusting solution is 5；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, Na-bentonite are added in step (1) acquired solution
Soil, sulfonated gilsonite, in the case where frequency is 50Hz, ultrasonic disperse handles 10min, and 45 DEG C of heating water baths stir evenly；
(3) the addition polyethyleneglycol diacrylate, potassium peroxydisulfate, anhydrous sodium sulfite in step (2) acquired solution, 45
Polymerization reaction 30min at DEG C；
(4) cooling is stood, drying to constant weight at 50 DEG C to get the diverting agent after polymeric shear is granulated.
Embodiment 2
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 30%, third
Olefin(e) acid 20%, calcium-base bentonite 10%, cornstarch 10%, sulfonated gilsonite 10%, 2- acrylamide-2-methyl propane sulfonic 5%,
N, N '-methylene-bisacrylamide 1%, ammonium persulfate 3.5%, sodium hydrogensulfite 2.5%, surplus are distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and cornstarch mixing are added in the reaction vessel, the rear acrylic acid that is added mixes, and quality percentage is then added
Number is 6 for the pH value of 30% sodium hydroxide solution adjusting solution；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, calcium base swelling are added in step (1) acquired solution
Soil, sulfonated gilsonite, in the case where frequency is 30Hz, ultrasonic disperse handles 15min, and 55 DEG C of heating water baths stir evenly；
(3) it is added N in step (2) acquired solution, N '-methylene-bisacrylamide, ammonium persulfate, sodium hydrogensulfite,
Polymerization reaction 20min at 55 DEG C；
(4) cooling is stood, drying to constant weight at 50 DEG C to get the diverting agent after polymeric shear is granulated.
Embodiment 3
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 20%, third
Olefin(e) acid 15%, sodium bentonite 5%, potato starch 10%, sulfonated gilsonite 10%, 2- acrylamide-2-methyl propane sulfonic
8%, polyethyleneglycol diacrylate 0.2%, N, N '-methylene-bisacrylamide 0.3%, hydrogen peroxide 2.8%, tartaric acid
2.2%, surplus is distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and potato starch mixing are added in the reaction vessel, the rear acrylic acid that is added mixes, and quality hundred is then added
The pH value that the sodium hydroxide solution that score is 20% adjusts solution is 6；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, Na-bentonite are added in step (1) acquired solution
Soil, sulfonated gilsonite, in the case where frequency is 40Hz, ultrasonic disperse handles 12min, and 50 DEG C of heating water baths stir evenly；
(3) polyethyleneglycol diacrylate, N,N methylene bis acrylamide, mistake are added in step (2) acquired solution
Hydrogen oxide, tartaric acid, polymerization reaction 25min at 50 DEG C；
(4) cooling is stood, drying to constant weight at 55 DEG C to get the diverting agent after polymeric shear is granulated.
Embodiment 4
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 25%, third
Olefin(e) acid 15%, sodium bentonite 5%, calcium-base bentonite 3%, cornstarch 8%, sulfonated gilsonite 8%, 2- acrylamide -2- first
Base propane sulfonic acid 8%, polyethyleneglycol diacrylate 0.8%, potassium peroxydisulfate 4.5%, anhydrous sodium sulfite 3.5%, surplus are to steam
Distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and cornstarch mixing are added in the reaction vessel, the rear acrylic acid that is added mixes, and quality percentage is then added
Number is 6 for the pH value of 30% sodium hydroxide solution adjusting solution；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, Na-bentonite are added in step (1) acquired solution
Soil, calcium-base bentonite, sulfonated gilsonite, in the case where frequency is 50Hz, ultrasonic disperse handles 10min, and 50 DEG C of heating water baths stir evenly；
(3) the addition polyethyleneglycol diacrylate, potassium peroxydisulfate, anhydrous sodium sulfite in step (2) acquired solution, 50
Polymerization reaction 25min at DEG C；
(4) cooling is stood, drying to constant weight at 55 DEG C to get the diverting agent after polymeric shear is granulated.
Comparative example 1
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 25%, third
Olefin(e) acid 15%, sodium bentonite 5%, calcium-base bentonite 3%, cornstarch 8%, sulfonated gilsonite 8%, polyethylene glycol diacrylate
Ester 0.8%, potassium peroxydisulfate 4.5%, anhydrous sodium sulfite 3.5%, surplus are distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and cornstarch mixing are added in the reaction vessel, the rear acrylic acid that is added mixes, and then mass percent is
The pH value that 30% sodium hydroxide solution adjusts solution is 6；
(2) acrylamide, sodium bentonite, calcium-base bentonite, sulfonated gilsonite are added in step (1) acquired solution,
Frequency is that ultrasonic disperse handles 10min under 50Hz, and 50 DEG C of heating water baths stir evenly；
(3) polyethyleneglycol diacrylate, potassium peroxydisulfate, anhydrous sodium sulfite are added in step (2) acquired solution,
Polymerization reaction 25min at 50 DEG C；
(4) cooling is stood, drying to constant weight at 55 DEG C to get the diverting agent after polymeric shear is granulated.
Comparative example 2
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 25%, third
Olefin(e) acid 15%, sodium bentonite 5%, calcium-base bentonite 3%, sulfonated gilsonite 16%, 2- acrylamide-2-methyl propane sulfonic 8%,
Polyethyleneglycol diacrylate 0.8%, potassium peroxydisulfate 4.5%, anhydrous sodium sulfite 3.5%, surplus are distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and acrylic acid are added in the reaction vessel, the sodium hydroxide solution that mass percent is 30% is then added
The pH value for adjusting solution is 6；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, Na-bentonite are added in step (1) acquired solution
Soil, calcium-base bentonite, sulfonated gilsonite, in the case where frequency is 50Hz, ultrasonic disperse handles 10min, and 50 DEG C of heating water baths stir evenly；
(3) polyethyleneglycol diacrylate, potassium peroxydisulfate, anhydrous sodium sulfite are added in step (2) acquired solution,
Polymerization reaction 25min at 50 DEG C；
(4) cooling is stood, drying to constant weight at 55 DEG C to get the diverting agent after polymeric shear is granulated.
Comparative example 3
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 25%, third
Olefin(e) acid 15%, sodium bentonite 5%, calcium-base bentonite 3%, cornstarch 16%, 2- acrylamide-2-methyl propane sulfonic 8%,
Polyethyleneglycol diacrylate 0.8%, potassium peroxydisulfate 4.5%, anhydrous sodium sulfite 3.5%, surplus are distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and cornstarch mixing are added in the reaction vessel, acrylic acid is then added and mass percent is 30%
Sodium hydroxide solution, sodium hydroxide solution be used to adjust solution pH value be 6；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, Na-bentonite are added in step (1) acquired solution
Soil, calcium-base bentonite, in the case where frequency is 50Hz, ultrasonic disperse handles 10min, and 50 DEG C of heating water baths stir evenly；
(3) polyethyleneglycol diacrylate, potassium peroxydisulfate, anhydrous sodium sulfite are added in step (2) acquired solution,
Polymerization reaction 25min at 50 DEG C；
(4) cooling is stood, drying to constant weight at 55 DEG C to get the diverting agent after polymeric shear is granulated.
Comparative example 4
A kind of pressure break degradable water dissolubility diverting agent includes the raw material of following mass percent: acrylamide 25%, third
Olefin(e) acid 15%, sodium bentonite 13%, calcium-base bentonite 11%, 2- acrylamide-2-methyl propane sulfonic 8%, polyethylene glycol two
Acrylate 0.8%, potassium peroxydisulfate 4.5%, anhydrous sodium sulfite 3.5%, surplus are distilled water.
The preparation method of pressure break degradable water dissolubility diverting agent the following steps are included:
(1) water and acrylic acid are added in reaction vessel, the sodium hydroxide solution tune that mass percent is 30% is then added
The pH value for saving solution is 6；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, Na-bentonite are added in step (1) acquired solution
Soil, calcium-base bentonite, in the case where frequency is 50Hz, ultrasonic disperse handles 10min, and 50 DEG C of heating water baths stir evenly；
(3) the addition polyethyleneglycol diacrylate, potassium peroxydisulfate, anhydrous sodium sulfite in step (2) acquired solution, 50
Polymerization reaction 25min at DEG C；
(4) cooling is stood, drying to constant weight at 55 DEG C to get the diverting agent after polymeric shear is granulated.
Effect example
With TA company, U.S. Q50 thermogravimetric analyzer, 6100 type drill core permeability rate tester of Chandler company, the U.S., Britain
Stable Micro System company's T AXTplus Texture instrument, Japan's Shimadzu JSM-6610 scanning electron microscope, German Brooker
The laboratory apparatus such as Vector22 type Fourier Transform Infrared Spectrometer test diverting agent performance, test result such as 1 institute of table
Show:
The performance characterization test result of diverting agent obtained by 1 embodiment of the present invention of table
As shown in table 1, the corresponding diverting agent of Examples 1 to 4 lacks in the raw material of comparative example 1 compared to comparative example 1~4
2- acrylamide-2-methyl propane sulfonic lacks starch in the raw material of comparative example 2, lacks sulfonated gilsonite in the raw material of comparative example 3,
Lack starch and sulfonated gilsonite in the raw material of comparative example 4.The water absorbent rate of diverting agent of the present invention illustrates to inhale all at 120 times or more
It is aqueous can all preferably；Degradation time meets temporarily stifled requirement all within 20h simultaneously；Diverting agent intensity also complies with life after water suction
It produces and requires；Thermogravimetric analysis is obtained just to be started to be broken in 320 DEG C or more main chains, shows that diverting agent has good heat resistance；Temporarily
Blocking agent is attained by 98% or more to the sealing ratiod of core, and maximum breakthrough pressure gradient is between 21.5~25.5MPa/m, table
Bright diverting agent has good sealing characteristics.Therefore, the water imbibition, degradability, intensity of diverting agent prepared by the present invention and heat-resisting
Property etc. all meets production requirement.
When control other conditions are constant, when only changing type of crosslinking agent and dosage, diverting agent water absorbent rate and degradation time
As shown in Figure 1, 2.As shown in Figure 1, 2, addition PEGDA ratio NMBA diverting agent water absorbent rate is high and degradation time is short.Mainly because
For the high polymer prepared by PEGDA, the longer easy adjusting of strand, crosslinking is uniformly；NMBA strand is shorter, with reaction into
Row, reactivity are gradually reduced, easily formation linear polymer.
As shown in Figure 3,4, the SEM of diverting agent of the invention after sulfonated gilsonite is added, after diverting agent water suction freeze-drying
Figure.As can be seen from the figure plus after the water suction of the diverting agent of sulfonated gilsonite space lattice is intensive, but overall structure compares consolidation, and table
Face is more smooth, without obvious fold, space lattice more crypto set after the diverting agent water suction of sulfonated gilsonite is added, and be in loose lamella
Shape, gully shape, therefore it is more advantageous to diverting agent water suction and degradation.
As shown in figure 5, curve a calcium-base bentonite 3625cm-1For the stretching vibration absworption peak of Al-O-H, 3425cm-1For layer
Between water-OH stretching vibration absworption peak, acrylic acid-OH absorption band is in 3425,3625cm in c-1Place contains swelling without absorption, curve b
The diverting agent 3431cm of soil-1Merge for calcium-base bentonite Al-O-H with the stretching vibration absworption peak of acrylic acid-OH, but 3625cm-1
Obviously weaken at peak, it may be possible to which hydroxyl takes part in reaction in bentonite, weakens hydrogen bond action, mobile to long wave direction, it is also possible to
It is that dihydroxypropyl masks bentonite hydroxyl, correlation curve c illustrates that bentonitic participation has not significant impact product structure.
Curve a, 1039cm-1It is nearby the asymmetric stretching vibration absorption peak of bentonite Si-O-Si, intensity is small, and calcic base is not swollen by curve c
Profit is native, and absorption peak is obviously influenced by bentonite in curve b, appears in 1050cm-1Place.
Sealing agent of the invention tests the pressure of core when blocking core.It will be appreciated from fig. 6 that working as trickle
When flowing out 1.5 times of PV (pore-body accumulated amount), pressure reaches maximum value at this time, with the increase of PV volume, the main duct of core
It is dead by blocking.When efflux is up to 4 times of PV volumes, pressure starts to reduce, and illustrates that diverting agent has been introduced into entire core, and by
It blocks.When reaching 7 times of PV volumes, pressure drop, diverting agent starts to degrade at this time, and when up to 14 times of PV volumes, pressure becomes
In constant, diverting agent degradation is complete.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement and simple modifications etc., should all be included in the protection scope of the present invention in content.
Claims (9)
1. a kind of pressure break degradable water dissolubility diverting agent, which is characterized in that the diverting agent by following mass percent raw material
It prepares: acrylamide 10~30%, acrylic acid 10~20%, bentonite 5~10%, starch 5~10%, sulfonated gilsonite 5
~10%, 2- acrylamide-2-methyl propane sulfonic 5~10%, crosslinking agent account for the 0.01~0.05% of monomer mass, initiator and account for
The 0.4~0.8% of monomer mass, surplus are distilled water.
2. pressure break according to claim 1 degradable water dissolubility diverting agent, which is characterized in that the bentonite is sodium base
At least one of bentonite, calcium-base bentonite.
3. pressure break according to claim 1 degradable water dissolubility diverting agent, which is characterized in that the starch is cassava
At least one of powder, cornstarch, potato starch.
4. pressure break according to claim 1 degradable water dissolubility diverting agent, which is characterized in that the crosslinking agent is poly- second
Omega-diol diacrylate, N, at least one of N '-methylene-bisacrylamide.
5. pressure break according to claim 1 degradable water dissolubility diverting agent, which is characterized in that the initiator is over cure
Sour potassium/anhydrous sodium sulfite, ammonium persulfate/sodium hydrogensulfite, tert-butyl hydroperoxide/sodium pyrosulfite, hydrogen peroxide/winestone
One of acid combination.
6. a kind of method for preparing pressure break degradable water dissolubility diverting agent described in claim 1, which is characterized in that this method
The following steps are included:
(1) water and starch mixing are added in the reaction vessel, acrylic acid is then added and mixes；
(2) acrylamide, 2- acrylamide-2-methyl propane sulfonic, bentonite, sulfonation drip are added in step (1) acquired solution
Blueness, heating stirring is uniform after ultrasonic disperse；
(3) crosslinking agent is added in step (2) acquired solution, initiator carries out polymerization reaction；
(4) cooling is stood, drying is after polymeric shear is granulated to get the diverting agent.
7. the pressure break according to claim 6 preparation method of degradable water dissolubility diverting agent, which is characterized in that step
(1) in, the sodium hydroxide solution that mass percent is 20~30% is added, the pH value for adjusting solution is 5~6.
8. the pressure break according to claim 6 preparation method of degradable water dissolubility diverting agent, which is characterized in that step
(2) in, in the case where frequency is 30~50Hz, ultrasonic disperse handles 10~15min.
9. the pressure break according to claim 6 preparation method of degradable water dissolubility diverting agent, which is characterized in that step
(3) in, the temperature of polymerization reaction is 45~55 DEG C, and the time is 20~30min.
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Application publication date: 20190712 |