CN114806523B - Multiple emulsion gel composite plugging system and preparation method and application thereof - Google Patents
Multiple emulsion gel composite plugging system and preparation method and application thereof Download PDFInfo
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- 239000000839 emulsion Substances 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000012071 phase Substances 0.000 claims abstract description 157
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 148
- 239000008346 aqueous phase Substances 0.000 claims abstract description 26
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 26
- 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
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 14
- 239000004094 surface-active agent Substances 0.000 claims abstract description 12
- 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 14
- 238000002156 mixing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 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 12
- 230000009977 dual effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 73
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- 239000003129 oil well Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 230000002209 hydrophobic effect 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
- 239000005543 nano-size silicon particle Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 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
- 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
- 239000007788 liquid Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000011146 organic particle 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
- 239000011435 rock 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
- 238000007664 blowing Methods 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
- 239000003673 groundwater 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000007762 w/o emulsion Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- C09K8/50—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
- C09K8/50—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
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Abstract
The invention provides a multiple emulsion gel composite plugging system, a preparation method and application thereof. The multiple emulsion gel composite plugging control system consists of a W/O type primary phase and an external water phase; the W/O type primary phase comprises an oil phase and an inner water phase, wherein the oil phase comprises an oil-soluble surfactant and white oil, and the inner water phase comprises polyacrylamide, chromium acetate and water; the outer aqueous phase contains an emulsifier and water. The plugging system disclosed by the invention can plug a water layer without damaging an oil layer, is easy to inject into a stratum, exerts the dual plugging performance of emulsion and gel, and has oil-water selectivity and excellent plugging effect.
Description
Technical Field
The invention relates to a multiple emulsion gel composite plugging system and a preparation method and application thereof, belonging to the technical field of oilfield chemistry.
Background
The phenomenon that the water content of an oil well is increased in the later development period of the water displacement reservoir can occur, and the harm caused by high water content of the oil well is great, for example: (1) Stopping the blowout of the oil well, and continuously increasing the water content after water is supplied, so that the weight of a shaft liquid column is increased, and the self-blowing well cannot self-blow; (2) The sand is produced from the oil well, so that the sand layer with loose cementation is damaged, the sand is produced, and the oil layer is collapsed or the oil well is stopped when serious; (3) The oil well can leak water too early, so that a plurality of dead oil areas can be formed underground, and the recovery ratio of an oil reservoir is greatly reduced; (4) Equipment corrosion can corrode oil well equipment and damage well structures, increase workover tasks and difficulty, and shorten the service life of an oil well; (5) The oil extraction cost is increased, the water injection quantity on the ground is increased, and the use quantity of a ground water source, the use of water injection facilities and the electric energy consumption are correspondingly increased.
The profile control water shutoff is taken 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 development of oil fields, oil reservoir characteristics and environments are continuously changed, and especially after the oil reservoir enters a high-water-content production period, the long-term water drives the oil reservoir development contradiction to be more prominent. The prior art generally uses polyacrylamide gel plugging agents and solid particle plugging agents. The polyacrylamide high-temperature gel plugging agent has over-fast gel forming time, is easy to cause the plugging of near-wellbore zones, and is easy to cause damage when a water-based gel system enters an oil layer in the operation process. 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 adjusts the water absorption profile and the water permeability through bridging of the organic particles and filling of the inorganic particles so as to block a high permeable layer and a water outlet layer, thereby achieving the purposes of adjusting the water absorption profile and plugging water; however, the plugging agent is a non-selective plugging agent, and the granular plugging agent has poor stability, is easy to agglomerate and damage a reservoir, and is only suitable for plugging near well zones. The emulsion water plugging system has excellent oil-water selectivity and low damage to an oil layer, the existing emulsion water plugging system is mainly water-in-oil type and oil-in-water type emulsion, the oil-in-water type emulsion mainly utilizes the Jack effect, the viscosity is low, but the plugging strength is weak; the water-in-oil emulsion has higher viscosity, and has high plugging strength, but has high injection pressure into 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 and oil-in-water type emulsions; however, compared with the traditional gel type and solid particle type plugging agents, the plugging strength of the W/O/W type multiple emulsion is lower.
For example, chinese patent document CN112210357a discloses a W/O/W type multiple emulsion water shutoff system, which consists 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), wherein the W/O type initial phase comprises an oil phase and an inner water phase, and the volume ratio of the oil phase to the inner water phase is (4-2): (6-8), wherein the oil phase comprises 1-5% of oil-soluble surfactant, 0.1-0.5% of nano silicon dioxide sol and the balance of oil. The invention firstly uses the Jack effect of multiple interfaces to block the water layer, and simultaneously the emulsifier and stabilizer of the water phase in the W/O/W type multiple emulsion are adsorbed on the rock surface, the external phase of the W/O/W type multiple emulsion loses stability, the W/O type emulsion with high viscosity is separated, and the water layer is further blocked. However, the plugging effect and the plugging strength of the water plugging system are required to be further improved, and the effective plugging effect cannot be achieved when the flow rate of the water phase is large.
Therefore, there is a need to develop a novel selective water shutoff system capable of blocking a water layer without damaging an oil layer, easy to inject into a formation, having oil-water selectivity and excellent shutoff effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multiple emulsion gel composite plugging system, and a preparation method and application thereof. The plugging system disclosed by the invention can plug a water layer without damaging an oil layer, is easy to inject into a stratum, exerts the dual plugging performance of emulsion and gel, and has oil-water selectivity and excellent plugging effect.
In order to solve the problems, the invention is realized by the following technical scheme:
the multiple emulsion gel composite plugging system consists of a W/O type primary phase and an external water phase; the W/O type primary phase comprises an oil phase and an inner water phase, wherein the oil phase comprises an oil-soluble surfactant and white oil, and the inner water phase comprises polyacrylamide, chromium acetate and water; the outer aqueous phase contains an emulsifier and water.
According to the invention, 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).
According to the invention, the W/O type primary phase is preferably characterized in that the volume ratio of the oil phase to the internal water phase is (6-9): (1-4).
Preferably according to the present invention, the oil-soluble surfactant is Span80 or Span85; preferably, the oil-soluble surfactant is Span80.
According to the invention, the mass concentration of the oil-soluble surfactant in the oil phase is 3% -7%, and the balance is white oil.
According to the invention, the mass concentration of polyacrylamide in the internal water phase 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 the polyacrylamide is 0.6%, and the mass concentration of the chromium acetate is 0.3%.
According to the invention, the number average molecular weight of the polyacrylamide is preferably 1000 to 2000 ten thousand, preferably 1200 ten thousand.
According to a preferred embodiment of the invention, the emulsifier is an alkanolamide.
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 system comprises the following steps:
(1) Preparation of an oil phase: dissolving an oil-soluble surfactant in white oil to obtain an oil phase;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide and chromium acetate in water to obtain an inner water phase;
(3) Preparation of W/O type initial phase: 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 an external aqueous phase: dissolving an emulsifier in water to obtain an external water phase;
(5) And (3) stirring and mixing the W/O type primary phase and the external water phase to obtain the multi-emulsion gel composite plugging regulating system.
According to the invention, in the step (3), the high-speed stirring rotation speed is 5000-8000r/min, and the stirring time is 5-8min.
According to the invention, in the step (5), the stirring speed is 2000-4000r/min and the stirring time is 8-12min.
The application of the multiple emulsion gel composite plugging system is applied to profile control and water plugging.
The invention has the technical characteristics and beneficial effects that:
1. the W/O/W type multiple emulsion composite plugging system is injected into an oil well, the temperature of the oil well gradually rises from top to bottom in an oil reservoir oil well and the system enters a stratum, the W/O/W type multiple emulsion firstly plugs a water layer by utilizing the Jack effect of multiple interfaces, meanwhile, a polymer in an inner water phase in the W/O/W type multiple emulsion and chromium acetate undergo a crosslinking reaction to form gel, the size of the gel can be regulated and controlled by controlling the granularity of the emulsified inner water phase, the water layer is further plugged, and the plugging strength is improved.
2. The W/O/W type multiple emulsion composite plugging system can plug a water layer without damaging an oil layer, is easy to inject into a stratum, and has oil-water selectivity and excellent plugging effect.
3. The particle size of gel formed after the polymer is crosslinked can be controlled by utilizing liquid drops formed by the water-in-oil internal water phase; thereby being applicable to formations of different pore sizes. The gel system formed by crosslinking the polymer of the inner water phase and the crosslinking agent has higher blocking strength compared with the gel system in oil with emulsified oil, and can generate higher blocking resistance in the porous medium migration process. The emulsifier used in the external water phase not only has excellent emulsifying property, but also has excellent interfacial activity so as to play a role in oil displacement and oil washing. Because the external phase of the W/O/W is a water phase, the water can enter a water channeling layer with high permeability and higher water saturation more easily, and because of the existence of oil-water capillary force, the system enters a layer with lower oil saturation and permeability, and has better oil-water selectivity.
4. The stability of the external water phase formed by the combination of 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 in the oil phase, so that on one hand, the cost is reduced, and on the other hand, the addition of the hydrophobic nano material can influence the gel forming performance of the internal water phase gel, even the gel is not formed.
5. The multiple emulsion gel composite plugging system provided by the invention is taken as a whole, and the double plugging performance of emulsion and gel is exerted, and the plugging system has higher plugging strength and excellent plugging effect due to the combined action of the component systems.
Detailed Description
The invention is further illustrated by, but not limited to, the following specific examples.
The raw materials used in the examples are all conventional raw materials and are commercially available; the methods are prior art unless specified otherwise.
Example 1
The preparation method of the W/O/W type multiple emulsion composite plugging control system comprises the following steps:
(1) Preparing an oil phase: dissolving Span80 in white oil to obtain an oil phase; the mass fraction of Span80 in the oil phase is 3%;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an inner water phase; in the inner aqueous phase, the mass concentration of polyacrylamide was 0.6%, and the mass concentration of chromium acetate was 0.3%.
(3) W/O type initial phase preparation: 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; in the external aqueous phase, the mass concentration of alkanolamide was 0.3%.
(5) And mixing 10mL of W/O type initial phase with 90mL of external water, and homogenizing for 10min at a rotating speed of 3000r/min 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 control system comprises the following steps:
(1) Preparing an oil phase: dissolving Span80 in white oil to obtain an oil phase; the mass fraction of Span80 in the oil phase is 5%;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an inner water phase; in the inner aqueous phase, the mass concentration of polyacrylamide was 0.6%, and the mass concentration of chromium acetate was 0.3%.
(3) W/O type initial phase preparation: 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; in the external aqueous phase, the mass concentration of alkanolamide was 0.5%.
(5) And (3) mixing 20mL of W/O type initial phase with 80mL of external water phase, and homogenizing for 12min at a rotating speed of 2000r/min to obtain the W/O/W type multiple emulsion composite plugging control system.
Example 3
The preparation method of the W/O/W type multiple emulsion composite plugging control system comprises the following steps:
(1) Preparing an oil phase: dissolving Span80 in white oil to obtain an oil phase; the mass fraction of Span80 in the oil phase is 7%;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an inner water phase; in the inner aqueous phase, the mass concentration of polyacrylamide was 0.6%, and the mass concentration of chromium acetate was 0.3%.
(3) W/O type initial phase preparation: 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; in the external aqueous phase, the mass concentration of alkanolamide was 0.3%.
(5) Mixing 30mL of W/O type initial phase with 70mL of external water phase, and homogenizing for 12min at a rotating speed of 2000r/min to obtain a W/O/W type multiple emulsion composite plugging control system.
Comparative example 1
The preparation method of the W/O/W type multiple emulsion composite plugging control system comprises the following steps:
(1) Preparing an oil phase: dissolving Span80 in white oil to obtain an oil phase; the mass fraction of Span80 in the oil phase is 3%;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight of 1200 ten thousand) into water to obtain an inner water phase; the mass concentration of polyacrylamide in the internal aqueous phase was 0.6%.
(3) W/O type initial phase preparation: 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; in the external aqueous phase, the mass concentration of alkanolamide was 0.3%.
(4) And mixing 10mL of W/O type initial phase with 90mL of external water, and homogenizing for 10min at a rotating speed of 3000r/min to obtain the W/O/W type multiple emulsion composite plugging control system.
Comparative example 2
The preparation method of the W/O/W type multiple emulsion composite plugging control system comprises the following steps:
(1) Preparing an oil phase: span80 is dissolved in ethylene tar to obtain an oil phase; the mass fraction of Span80 in the oil phase is 3%;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an inner water phase; in the inner aqueous phase, the mass concentration of polyacrylamide was 0.6%, and the mass concentration of chromium acetate was 0.3%.
(3) W/O type initial phase preparation: 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; in the external aqueous phase, the mass concentration of alkanolamide was 0.3%.
(5) And mixing 10mL of W/O type initial phase with 90mL of external water, and homogenizing for 10min at a rotating speed of 3000r/min to obtain the W/O/W type multiple emulsion composite plugging control system.
Comparative example 3
The preparation method of the W/O/W type multiple emulsion composite plugging control system comprises the following steps:
(1) Preparing an oil phase: span80 is dissolved in white oil, and then hydrophobic nano silicon dioxide particles are dispersed 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 silicon dioxide is 1%;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide HPAM (number average molecular weight 1200 ten thousand) and chromium acetate into water to obtain an inner water phase; in the inner aqueous phase, the mass concentration of polyacrylamide was 0.6%, and the mass concentration of chromium acetate was 0.3%.
(3) W/O type initial phase preparation: 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; in the external aqueous phase, the mass concentration of alkanolamide was 0.3%.
(4) And mixing 10mL of W/O type initial phase with 90mL of external water, and homogenizing for 10min at a rotating speed of 3000r/min to obtain the W/O/W type multiple emulsion composite plugging control system.
Application test example
Plugging capability test:
the plugging ability of the plugging system was examined by taking the W/O/W type multiple emulsion composite plugging systems of examples 1 to 3 and comparative examples 1 to 3 as the subjects of study.
The specific simulation experiment process is as follows: the simulated cores were prepared by filling quartz sand grains with sand filling tubes having an inner diameter of 2.5cm and a length of 20cm, and were designated as # 1, # 2, # 3, # 4, # 5, and # 6, respectively. The sand pack was then saturated with water and the water phase permeability was measured at 60 ℃. The plugging systems of examples 1-3 and comparative examples 1-3 were respectively injected into a 1# 6 sand-filling pipe with an injection volume of 0.5PV (core pore volume), the sand-filling pipe was water-driven to a stable pressure, and the permeability k after plugging of the sand-filling pipe was measured 2 And is expressed as equation e= (k) 1 -k 2 )/k 1 *100%, core plugging rate E was calculated, and the experimental results are shown in Table 1 below.
Table 1 plugging capability test data
| Simulated rock core | k 1 ，μm 2 | k 2 ，μm 2 | E，％ |
| 1# (example 1) | 1.89 | 0.066 | 96.5 |
| 2# (example 2) | 2.34 | 0.061 | 97.4 |
| 3# (example 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 emulsions prepared according to the present invention have excellent blocking effect. The internal aqueous phase in comparative example 1 is not added with a cross-linking agent, so that the plugging effect is poorer than that of the example by simply relying on multiple emulsions; in comparative example 2, the oil phase used is not matched with the emulsifier alkanolamide, so that the W/O/W type emulsion has poor stability and the blocking performance is influenced by rapid demulsification; in comparative example 3, the oil phase added with the hydrophobic nano silica destroyed the crosslinking reaction of the polymer and the crosslinking agent in the inner water phase, so the blocking rate was poor.
Claims (9)
1. The multiple emulsion gel composite plugging system is characterized by comprising a W/O type primary phase and an external water phase; the W/O type primary phase comprises an oil phase and an inner water phase, wherein the oil phase comprises an oil-soluble surfactant and white oil, and the inner water phase comprises polyacrylamide, chromium acetate and water; the outer aqueous phase contains an emulsifier and water;
the volume ratio of the W/O type primary phase to the external water phase is (0.5-3): (7-9.5); the volume ratio of the oil phase to the internal water phase in the W/O type primary phase is (6-9): (1-4); the oil-soluble surfactant is Span80 or Span85; in the oil phase, the mass concentration of the oil-soluble surfactant is 3% -7%, and the balance is white oil; the mass concentration of the polyacrylamide is 0.4-1%, the mass concentration of the chromium acetate is 0.2-0.5%, and the balance is water; the number average molecular weight of the polyacrylamide is 1000-2000 ten thousand; the emulsifier is alkanolamide; the mass concentration of the emulsifier in the external water phase is 0.1-0.5%, and the balance is water.
2. The multiple emulsion gel composite plugging system according to claim 1, wherein the volume ratio of the W/O type primary phase to the external water phase is (1-3): (7-9).
3. The multiple emulsion gel composite plugging system of claim 1, wherein the oil-soluble surfactant is Span80.
4. The multiple emulsion gel composite plugging control system according to claim 1, wherein the mass concentration of polyacrylamide in the inner water phase is 0.6%, and the mass concentration of chromium acetate is 0.3%.
5. The multiple emulsion gel composite plugging system of claim 1, wherein the number average molecular weight of the polyacrylamide is 1200 ten thousand.
6. The multiple emulsion gel composite plugging control system according to claim 1, wherein the mass concentration of the emulsifier in the external water phase is 0.3-0.5%.
7. The preparation method of the multiple emulsion gel composite plugging system as defined in any one of claims 1 to 6, comprising the following steps:
(1) Preparation of an oil phase: dissolving an oil-soluble surfactant in white oil to obtain an oil phase;
(2) Preparation of the inner aqueous phase: dissolving polyacrylamide and chromium acetate in water to obtain an inner water phase;
(3) Preparation of W/O type initial phase: 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 an external aqueous phase: dissolving an emulsifier in water to obtain an external water phase;
(5) And (3) stirring and mixing the W/O type primary phase and the external water phase to obtain the multi-emulsion gel composite plugging regulating system.
8. The method for preparing the multiple emulsion gel composite plugging system according to claim 7, wherein the method comprises one or more of the following conditions:
i. in the step (3), the high-speed stirring rotating speed is 5000-8000r/min, and the stirring time is 5-8min;
ii. In the step (5), the stirring speed is 2000-4000r/min, and the stirring time is 8-12min.
9. The use of the multiple emulsion gel composite profile control system according to any one of claims 1-6 for profile control and water shutoff.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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