CN114806523A - Multiple emulsion gel composite plugging regulating system and preparation method and application thereof - Google Patents
Multiple emulsion gel composite plugging regulating system and preparation method and application thereof Download PDFInfo
- Publication number
- CN114806523A CN114806523A CN202210488425.6A CN202210488425A CN114806523A CN 114806523 A CN114806523 A CN 114806523A CN 202210488425 A CN202210488425 A CN 202210488425A CN 114806523 A CN114806523 A CN 114806523A
- Authority
- CN
- China
- Prior art keywords
- phase
- oil
- water
- multiple emulsion
- regulating system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000839 emulsion Substances 0.000 title claims abstract description 59
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000012071 phase Substances 0.000 claims abstract description 169
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 156
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 25
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims abstract description 20
- 239000000499 gel Substances 0.000 claims abstract description 17
- 235000015110 jellies Nutrition 0.000 claims abstract description 17
- 239000008274 jelly Substances 0.000 claims abstract description 17
- 239000008346 aqueous phase Substances 0.000 claims abstract description 14
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 14
- 239000004094 surface-active agent Substances 0.000 claims abstract description 13
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical group CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 claims description 2
- 238000009775 high-speed stirring Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 230000009977 dual effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 74
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000003129 oil well Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- 238000011049 filling Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000011146 organic particle Substances 0.000 description 2
- 239000008385 outer phase Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 229910003480 inorganic solid Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- C09K8/50—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
-
- 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
- C09K8/50—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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention provides a multiple emulsion gel composite plugging regulating system and a preparation method and application thereof. The multiple emulsion gel composite plugging regulating system consists of a W/O type primary phase and an external water phase; the W/O type initial phase comprises an oil phase and an internal water phase, wherein the oil phase comprises an oil-soluble surfactant and white oil, and the internal water phase comprises polyacrylamide, chromium acetate and water; the external aqueous phase comprises an emulsifier and water. The plugging regulating system can block a water layer without damaging an oil layer, is easy to inject into a stratum, exerts the dual plugging regulating performance of emulsion and jelly, and has oil-water selectivity and excellent plugging effect.
Description
Technical Field
The invention relates to a multiple emulsion gel composite plugging regulating system and a preparation method and application thereof, belonging to the technical field of oilfield chemistry.
Background
The water content of the oil well is increased at the later development stage of oil displacement reservoir, and the harm caused by high water content of the oil well is many, such as: (1) the oil well stops spraying, the water content is continuously increased after water breakthrough, and the weight of a shaft liquid column is increased, so that the self-blowing well cannot perform self-blowing; (2) sand production of the oil well causes damage to a cemented and loosened sandstone layer, sand production is caused, and an oil layer collapses or the oil well stops production in severe cases; (3) the premature water breakthrough of the oil well can cause the formation of dead oil zones underground, thereby greatly reducing the recovery ratio of the oil reservoir; (4) equipment corrosion can corrode oil well equipment and destroy well body structures, increase the task and difficulty of workover operation and shorten the service life of an oil well; (5) the oil extraction cost is increased, the ground water injection quantity is increased, and the ground water source usage amount, the water injection facility usage and the electric energy consumption are correspondingly increased.
The profile control water shutoff is used as a conventional measure for controlling water in an oil field, and can play a role in improving the pressure of an oil layer and the sweep coefficient of injected water, thereby improving the recovery ratio of crude oil. However, with the development of oil fields, the characteristics and environment of oil reservoirs are changed continuously, and particularly after the oil reservoirs enter a high-water-content exploitation period, the contradiction of long-term water-driven oil reservoir development is more prominent. The prior art commonly uses polyacrylamide gel plugging agents and solid particle type plugging agents. The gelling time of the polyacrylamide high-temperature gel plugging agent is too fast, the near wellbore region is easy to be blocked, and the water-based gel system enters an oil layer during the operation process and is easy to be damaged. The solid particle type plugging agent mainly comprises inorganic solid particles such as cement, fly ash and the like and other organic particles, is injected into a stratum in a suspension form, and is used for adjusting a water absorption section and water phase permeability through bridging of the organic particles and filling of the inorganic particles so as to plug a high-permeability layer and a water outlet layer and achieve the purposes of adjusting the water absorption section and plugging water; but the particle type plugging agent is a nonselective plugging agent, has poor stability, is easy to agglomerate and damage a reservoir stratum, and is only suitable for plugging a near wellbore zone. The emulsion water plugging system has excellent oil-water selectivity and low damage to an oil layer, the existing emulsion water plugging system mainly comprises a water-in-oil type emulsion and an oil-in-water type emulsion, and the oil-in-water type emulsion mainly utilizes a Jamin effect, has low viscosity and is weaker in plugging strength; the water-in-oil type emulsion has high viscosity and high plugging strength, but has high injection pressure to the stratum and difficult injection. The W/O/W type multiple emulsion reported in the prior literature is expected to solve the problems of the water-in-oil type emulsion and the oil-in-water type emulsion; but compared with the traditional jelly glue type and solid particle type plugging agents, the W/O/W type multiple emulsion plugging strength is lower.
For example, chinese patent document CN112210357A discloses a W/O/W type multiple emulsion water shutoff system, which is composed of a W/O type primary phase and an external water phase, wherein the volume ratio of the W/O type primary phase to the external water phase is (3-0.5): (7-9.5), the W/O type initial phase comprises an oil phase and an internal water phase, and the volume ratio of the oil phase to the internal water phase is (4-2): (6-8), the oil phase comprises 1-5% by mass of oil-soluble surfactant, 0.1-0.5% by mass of nano silica sol and the balance of oil. According to the invention, firstly, a water layer is blocked by utilizing a Giardian effect of multiple interfaces, and meanwhile, the emulsifier and the stabilizer of the water phase in the W/O/W type multiple emulsion are adsorbed on the surface of rock, the outer phase of the W/O/W type multiple emulsion loses stability, and the W/O type emulsion with high viscosity is separated out to further block the water layer. However, the plugging effect and the plugging strength of the water plugging system of the invention need to be further improved, and the effective plugging effect can not be achieved when the flow rate of the water phase is larger.
Therefore, there is a need to develop a novel selective water plugging system which can plug a water layer without damaging an oil layer, is easy to inject into a stratum, and has oil-water selectivity and an excellent plugging effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multiple emulsion gel composite plugging regulating system and a preparation method and application thereof. The plugging regulating system can block a water layer without damaging an oil layer, is easy to inject into a stratum, exerts the dual plugging regulating performance of emulsion and jelly, and has oil-water selectivity and excellent plugging effect.
In order to solve the problems, the invention is realized by the following technical scheme:
a multiple emulsion jelly composite plugging regulating system consists of a W/O type initial phase and an external water phase; the W/O type initial phase comprises an oil phase and an internal water phase, wherein the oil phase comprises an oil-soluble surfactant and white oil, and the internal water phase comprises polyacrylamide, chromium acetate and water; the external aqueous phase comprises an emulsifier and water.
According to the invention, the volume ratio of the W/O type primary phase to the external aqueous phase is (0.5-3): (7-9.5), preferably (1-3): (7-9).
According to the invention, in the W/O type primary phase, the volume ratio of the oil phase to the internal water phase is (6-9): (1-4).
Preferably according to the invention, the oil-soluble surfactant is Span80 or Span 85; preferably, the oil soluble surfactant is Span 80.
According to the invention, the oil-soluble surfactant is preferably used in an oil phase, wherein the mass concentration of the oil-soluble surfactant is 3% -7%, and the balance is white oil.
According to the invention, the preferred internal water phase contains polyacrylamide with mass concentration of 0.4-1%, chromium acetate with mass concentration of 0.2-0.5%, and water for the rest; preferably, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
Preferably, the polyacrylamide has a number average molecular weight of 1000-2000 ten thousand, preferably 1200 ten thousand, according to the invention.
Preferably, according to the invention, the emulsifier is an alkanolamide.
Preferably, according to the invention, the mass concentration of the emulsifier in the external water phase is 0.1-0.5%, and the balance is water; preferably, the mass concentration of the emulsifier is 0.3-0.5%.
The preparation method of the multiple emulsion gel composite plugging control system comprises the following steps:
(1) preparation of oil phase: dissolving an oil-soluble surfactant in white oil to obtain an oil phase;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide and chromium acetate in water to obtain an internal water phase;
(3) preparation of W/O type initial phase: stirring and mixing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) at a high speed to obtain a W/O type initial phase;
(4) preparation of external water phase: dissolving an emulsifier in water to obtain an external water phase;
(5) and stirring and mixing the W/O type primary phase and the external water phase to obtain the multiple emulsion gel composite plugging regulating system.
Preferably, in step (3), the high-speed stirring speed is 8000r/min and the stirring time is 5-8 min.
Preferably, in step (5), the stirring speed is 2000-4000r/min, and the stirring time is 8-12 min.
The application of the multiple emulsion gel composite plugging control system is applied to profile control and water plugging.
The invention has the following technical characteristics and beneficial effects:
1. the W/O/W type multiple emulsion composite plugging regulating system is injected into an oil well, along with the gradual rise of the temperature from top to bottom in an oil reservoir oil well and the entering of the system into a stratum, the W/O/W type multiple emulsion firstly blocks a water layer by utilizing the Jamin effect of multiple interfaces, and simultaneously polymers in an inner water phase and chromium acetate in the W/O/W type multiple emulsion generate a cross-linking reaction to form jelly glue, and the size of the jelly glue can be regulated and controlled by controlling the granularity of the emulsified inner water phase, so that the water layer is further blocked, and the plugging strength is improved.
2. The W/O/W type multiple emulsion composite plugging regulating system can block a water layer without damaging an oil layer, is easy to inject into a stratum, and has oil-water selectivity and an excellent plugging effect.
3. The particle size of jelly formed after the polymer is crosslinked can be controlled by utilizing the liquid drop formed by the water-in-oil inner water phase; thereby adapting to formations of different pore sizes. Compared with a water-in-oil system, the gel system formed by the cross-linking of the polymer of the internal water phase and the cross-linking agent has higher plugging strength, and can generate higher plugging resistance in the migration process of the porous medium. The emulsifier used in the external water phase has excellent emulsifying performance and excellent interfacial activity, so that the oil displacement and washing effects are achieved. The outer phase of W/O/W is a water phase, so that the water enters a high-permeability water channeling layer with higher water saturation more easily, and the system enters a layer with lower oil saturation permeability due to the existence of oil-water capillary force, so that the oil-water selectivity is better.
4. The stability of the external water phase formed by matching the white oil in the oil phase and the alkanolamide in the external water phase is better; according to the invention, no nano material is added into the oil phase, so that the cost is reduced on one hand, and on the other hand, the addition of the hydrophobic nano material can influence the gelling performance of the inner water phase gel, even the gel is not formed.
5. The multiple emulsion and jelly composite plugging adjusting system provided by the invention is taken as a whole, the dual plugging adjusting performance of the emulsion and jelly is exerted, and the components and systems act together to enable the plugging adjusting system to have higher plugging strength and excellent plugging effect.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following specific examples.
The raw materials used in the examples are conventional raw materials and can be obtained commercially; the methods are prior art unless otherwise specified.
Example 1
The preparation method of the W/O/W type multiple emulsion composite plugging regulating system comprises the following steps:
(1) preparing an oil phase: dissolving Span80 in white oil to obtain oil phase; the mass fraction of Span80 in the oil phase is 3%;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an internal water phase; in the internal water phase, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
(3) Preparation of W/O type initial phase: placing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) in a beaker according to the volume ratio of 6:4, and homogenizing and stirring for 8min at the rotating speed of 6000r/min to obtain a W/O type initial phase;
(4) preparing an external water phase: dissolving alkanolamide in water to obtain an external water phase; the mass concentration of alkanolamide in the external water phase is 0.3%.
(5) Mixing 10mL of W/O type initial phase and 90mL of external water phase, and homogenizing at a rotating speed of 3000r/min for 10min to obtain the W/O/W type multiple emulsion composite plugging control system.
Example 2
The preparation method of the W/O/W type multiple emulsion composite plugging regulating system comprises the following steps:
(1) preparing an oil phase: dissolving Span80 in white oil to obtain oil phase; the mass fraction of Span80 in the oil phase is 5%;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an internal water phase; in the internal water phase, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
(3) Preparation of W/O type initial phase: placing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) in a beaker according to the volume ratio of 8:2, and homogenizing and stirring for 5min at the rotating speed of 8000r/min to obtain a W/O type initial phase;
(4) preparing an external water phase: dissolving alkanolamide in water to obtain an external water phase; the mass concentration of the alkanolamide in the external water phase is 0.5 percent.
(5) And mixing 20mL of W/O type initial phase and 80mL of external water phase, and homogenizing at the rotating speed of 2000r/min for 12min to obtain the W/O/W type multiple emulsion composite plugging regulating system.
Example 3
The preparation method of the W/O/W type multiple emulsion composite plugging regulating system comprises the following steps:
(1) preparing an oil phase: dissolving Span80 in white oil to obtain oil phase; the mass fraction of Span80 in the oil phase is 7%;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an internal water phase; in the internal water phase, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
(3) Preparation of W/O type initial phase: placing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) in a beaker according to the volume ratio of 9:1, and homogenizing and stirring for 7min at the rotating speed of 6000r/min to obtain a W/O type initial phase;
(4) preparing an external water phase: dissolving alkanolamide in water to obtain an external water phase; the mass concentration of alkanolamide in the external water phase is 0.3%.
(5) And mixing 30mL of W/O type initial phase and 70mL of external water phase, and homogenizing at the rotating speed of 2000r/min for 12min to obtain the W/O/W type multiple emulsion composite plugging regulating system.
Comparative example 1
The preparation method of the W/O/W type multiple emulsion composite plugging regulating system comprises the following steps:
(1) preparing an oil phase: dissolving Span80 in white oil to obtain oil phase; the mass fraction of Span80 in the oil phase is 3%;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide HPAM (the number average molecular weight is 1200 ten thousand) into water to obtain an internal water phase; in the internal water phase, the mass concentration of polyacrylamide is 0.6%.
(3) Preparation of W/O type initial phase: placing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) in a beaker according to the volume ratio of 6:4, and homogenizing and stirring for 8min at the rotating speed of 6000r/min to obtain a W/O type initial phase;
(3) preparing an external water phase: dissolving alkanolamide in water to obtain an external water phase; the mass concentration of alkanolamide in the external water phase is 0.3%.
(4) And mixing 10mL of W/O type initial phase and 90mL of external water phase, and homogenizing at the rotating speed of 3000r/min for 10min to obtain the W/O/W type multiple emulsion composite plugging regulating system.
Comparative example 2
The preparation method of the W/O/W type multiple emulsion composite plugging regulating system comprises the following steps:
(1) preparing an oil phase: dissolving Span80 in ethylene tar to obtain oil phase; the mass fraction of Span80 in the oil phase is 3%;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an internal water phase; in the internal water phase, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
(3) Preparation of W/O type initial phase: placing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) in a beaker according to the volume ratio of 6:4, and homogenizing and stirring for 8min at the rotating speed of 6000r/min to obtain a W/O type initial phase;
(4) preparing an external water phase: dissolving alkanolamide in water to obtain an external water phase; the mass concentration of alkanolamide in the external water phase is 0.3%.
(5) And mixing 10mL of W/O type initial phase and 90mL of external water phase, and homogenizing at the rotating speed of 3000r/min for 10min to obtain the W/O/W type multiple emulsion composite plugging regulating system.
Comparative example 3
The preparation method of the W/O/W type multiple emulsion composite plugging regulating system comprises the following steps:
(1) preparing an oil phase: dissolving Span80 in white oil, and then dispersing hydrophobic nano-silica particles in the white oil to obtain an oil phase; the mass fraction of Span80 in the oil phase is 3%, and the mass concentration of the hydrophobic nano-silica is 1%;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an internal water phase; in the internal water phase, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
(3) Preparation of W/O type initial phase: placing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) in a beaker according to the volume ratio of 6:4, and homogenizing and stirring for 8min at the rotating speed of 6000r/min to obtain a W/O type initial phase;
(3) preparing an external water phase: dissolving alkanolamide in water to obtain an external water phase; the mass concentration of alkanolamide in the external water phase is 0.3 percent.
(4) Mixing 10mL of W/O type initial phase and 90mL of external water phase, and homogenizing at a rotating speed of 3000r/min for 10min to obtain the W/O/W type multiple emulsion composite plugging control system.
Application test example
Testing the plugging capability:
the W/O/W type multiple emulsion composite plugging system of examples 1-3 and comparative examples 1-3 is taken as a research object to investigate the plugging capability of the plugging system.
The specific simulation experiment process is as follows: a simulated rock core is prepared by filling quartz sand into a sand filling pipe with the inner diameter of 2.5cm and the length of 20cm, and is respectively marked as No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6. Then, the sand-filled pipe is saturated with water, and the water phase permeability is measured at 60 ℃. Injecting the plugging systems of the examples 1-3 and the comparative examples 1-3 into No. 1-6 sand filling pipes respectively, wherein the injection volume is 0.5PV (core pore volume), then driving the sand filling pipes with water until the pressure is stable, and measuring the permeability k of the sand filling pipes after plugging 2 And according to the formula E ═ k 1 -k 2 )/k 1 And calculating the core plugging rate E by 100 percent, wherein the experimental result is shown in the following table 1.
Table 1 plugging capability test data
| Simulated rock core | k 1 ，μm 2 | k 2 ，μm 2 | E，％ |
| 1# (embodiment 1) | 1.89 | 0.066 | 96.5 |
| 2# (embodiment 2) | 2.34 | 0.061 | 97.4 |
| 3# (embodiment 3) | 1.83 | 0.064 | 96.5 |
| 4# (comparative example 1) | 1.89 | 0.425 | 77.5 |
| 5# (comparative example 2) | 2.11 | 0.458 | 78.3 |
| 6# (comparative example 3) | 2.05 | 0.543 | 73.5 |
As can be seen from table 1, the multiple emulsion prepared by the present invention has excellent blocking effect. In comparative example 1, no cross-linking agent was added to the inner aqueous phase, so the plugging effect by relying solely on multiple emulsions was inferior to that of the examples; compared with the prior art, the oil phase used in the method is not matched with the alkanolamide emulsifier, so that the W/O/W type emulsion has poor stability, and the plugging performance is influenced by rapid demulsification; in comparative example 3, hydrophobic nano-silica was added to the oil phase, which destroys the cross-linking reaction of the polymer and the cross-linking agent in the internal aqueous phase, and thus the blocking rate was poor.
Claims (10)
1. The multiple emulsion jelly composite plugging regulating system is characterized by consisting of a W/O type initial phase and an external water phase; the W/O type initial phase comprises an oil phase and an internal water phase, wherein the oil phase comprises an oil-soluble surfactant and white oil, and the internal water phase comprises polyacrylamide, chromium acetate and water; the external aqueous phase comprises an emulsifier and water.
2. The multiple emulsion jelly composite plugging regulating system according to claim 1, wherein the volume ratio of the W/O type primary phase to the external water phase is (0.5-3): (7-9.5), preferably (1-3): (7-9).
3. The multiple emulsion jelly composite plugging regulating system according to claim 1, wherein in the W/O type initial phase, the volume ratio of the oil phase to the internal water phase is (6-9): (1-4).
4. The multiple emulsion jelly composite plugging regulating system according to claim 1, wherein the oil soluble surfactant is Span80 or Span 85; preferably, the oil-soluble surfactant is Span 80;
preferably, in the oil phase, the mass concentration of the oil-soluble surfactant is 3% -7%, and the balance is white oil.
5. The multiple emulsion jelly composite plugging regulating system according to claim 1, wherein in the internal water phase, the mass concentration of polyacrylamide is 0.4-1%, the mass concentration of chromium acetate is 0.2-0.5%, and the balance is water; preferably, the mass concentration of polyacrylamide is 0.6%, and the mass concentration of chromium acetate is 0.3%.
6. The multiple emulsion gel composite plugging control system according to claim 1, wherein the polyacrylamide has a number average molecular weight of 1000-2000 ten thousand, preferably 1200 ten thousand.
7. The multiple emulsion jelly composite plugging regulating system according to claim 1, wherein the emulsifier is alkanolamide;
preferably, in the external water phase, the mass concentration of the emulsifier is 0.1-0.5%, and the balance is water; preferably, the mass concentration of the emulsifier is 0.3-0.5%.
8. A method for preparing a multiple emulsion gel composite plugging regulating system according to any one of claims 1 to 7, comprising the steps of:
(1) preparation of oil phase: dissolving an oil-soluble surfactant in white oil to obtain an oil phase;
(2) preparation of the internal aqueous phase: dissolving polyacrylamide and chromium acetate in water to obtain an internal water phase;
(3) preparation of W/O type initial phase: stirring and mixing the oil phase obtained in the step (1) and the internal water phase obtained in the step (2) at a high speed to obtain a W/O type initial phase;
(4) preparation of external water phase: dissolving an emulsifier in water to obtain an external water phase;
(5) and stirring and mixing the W/O type primary phase and the external water phase to obtain the multiple emulsion gel composite plugging regulating system.
9. The method for preparing the multiple emulsion jelly composite plugging regulating system according to claim 8, wherein one or more of the following conditions are included:
i. in the step (3), the high-speed stirring speed is 5000-;
ii. In the step (5), the stirring speed is 2000-4000r/min, and the stirring time is 8-12 min.
10. Use of the multiple emulsion jelly composite plugging system according to any one of claims 1 to 7 for profile control and water plugging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210488425.6A CN114806523B (en) | 2022-05-06 | 2022-05-06 | Multiple emulsion gel composite plugging system and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210488425.6A CN114806523B (en) | 2022-05-06 | 2022-05-06 | Multiple emulsion gel composite plugging system and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114806523A true CN114806523A (en) | 2022-07-29 |
| CN114806523B CN114806523B (en) | 2023-10-31 |
Family
ID=82510630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210488425.6A Active CN114806523B (en) | 2022-05-06 | 2022-05-06 | Multiple emulsion gel composite plugging system and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114806523B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115433555A (en) * | 2022-09-15 | 2022-12-06 | 中海油能源发展股份有限公司 | Multiple emulsion composite profile control and flooding system and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104830297A (en) * | 2015-04-14 | 2015-08-12 | 东北石油大学 | Preparation method of W/O/W type multiple emulsion delaying chromium sol cross-linking system |
| CN109575184A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | A kind of reversed-phase emulsion self-crosslinkable type profile-controlling and plugging agent and preparation method thereof |
| CN112210357A (en) * | 2020-10-23 | 2021-01-12 | 中国石油大学(华东) | W/O/W type multiple emulsion water shutoff system and preparation method thereof |
-
2022
- 2022-05-06 CN CN202210488425.6A patent/CN114806523B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104830297A (en) * | 2015-04-14 | 2015-08-12 | 东北石油大学 | Preparation method of W/O/W type multiple emulsion delaying chromium sol cross-linking system |
| CN109575184A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | A kind of reversed-phase emulsion self-crosslinkable type profile-controlling and plugging agent and preparation method thereof |
| CN112210357A (en) * | 2020-10-23 | 2021-01-12 | 中国石油大学(华东) | W/O/W type multiple emulsion water shutoff system and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115433555A (en) * | 2022-09-15 | 2022-12-06 | 中海油能源发展股份有限公司 | Multiple emulsion composite profile control and flooding system and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114806523B (en) | 2023-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112210357B (en) | W/O/W type multiple emulsion water shutoff system and preparation method thereof | |
| CA1074696A (en) | Oil recovery process by in situ emulsification | |
| US7458424B2 (en) | Tight formation water shut off method with silica gel | |
| US4649998A (en) | Sand consolidation method employing latex | |
| US5101903A (en) | Method for modifying the permeability of an underground formation | |
| US20130000900A1 (en) | Down-hole placement of water-swellable polymers | |
| US3711405A (en) | Low fluid loss well treating composition and method | |
| CN108531153B (en) | High-temperature-resistant petroleum resin dispersoid blocking agent and preparation method and application thereof | |
| EA009172B1 (en) | Method of completing poorly consolidated formations | |
| Cao et al. | Effect and mechanism of combined operation of profile modification and water shutoff with in-depth displacement in high-heterogeneity oil reservoirs | |
| CN107165612B (en) | A kind of method for removing blockage for oil/gas well | |
| CN106543996A (en) | Diversion agent and its using method are temporarily blocked up in a kind of acidifying | |
| US11098564B2 (en) | Hydraulic fracturing using multiple fracturing fluids sequentially | |
| CN108410439B (en) | Method for increasing production of oil well by combining gel foam and in-situ microemulsion | |
| CN114806523B (en) | Multiple emulsion gel composite plugging system and preparation method and application thereof | |
| Qing et al. | Study and application of gelled foam for in-depth water shutoff in a fractured oil reservoir | |
| CN115433555A (en) | Multiple emulsion composite profile control and flooding system and preparation method thereof | |
| Hao et al. | Using starch graft copolymer gel to assist the CO 2 huff-n-puff process for enhanced oil recovery in a water channeling reservoir | |
| CN107163921A (en) | A kind of oil base drilling fluid and preparation method thereof | |
| CN114426815B (en) | Oil-based drilling fluid suitable for strong water-sensitive and easily-collapsed stratum and preparation method and application thereof | |
| RU2645320C2 (en) | Bitumen emulsions for application in oil industry | |
| CN113122208B (en) | Ethylene tar-based water-in-oil type emulsion water shutoff agent and preparation method and application thereof | |
| CN104449627A (en) | Oil reservoir protection accelerator and preparation method thereof | |
| Ward | N2 and CO2 in the oil field: stimulation and completion applications | |
| CN112901110A (en) | Method for temporary blocking diversion fracturing by salinity response type emulsion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |