CN111218265A - Organic chromium water shutoff profile control agent and preparation method and application thereof - Google Patents
Organic chromium water shutoff profile control agent and preparation method and application thereof Download PDFInfo
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- CN111218265A CN111218265A CN202010175568.2A CN202010175568A CN111218265A CN 111218265 A CN111218265 A CN 111218265A CN 202010175568 A CN202010175568 A CN 202010175568A CN 111218265 A CN111218265 A CN 111218265A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 99
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000011651 chromium Substances 0.000 title claims abstract description 71
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 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 35
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 24
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
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- 229920000642 polymer Polymers 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 10
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 9
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 9
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 2
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- 239000013043 chemical agent Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
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- 239000003921 oil Substances 0.000 description 19
- 238000002474 experimental method Methods 0.000 description 15
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- 238000006073 displacement reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000035699 permeability Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910001430 chromium ion Inorganic materials 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
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- 150000002500 ions Chemical class 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920006037 cross link polymer Polymers 0.000 description 2
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- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
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- 239000011229 interlayer Substances 0.000 description 2
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- ZUGAOYSWHHGDJY-UHFFFAOYSA-K 5-hydroxy-2,8,9-trioxa-1-aluminabicyclo[3.3.2]decane-3,7,10-trione Chemical compound [Al+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O ZUGAOYSWHHGDJY-UHFFFAOYSA-K 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
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- 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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- 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
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- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The invention provides an organic chromium water shutoff profile control agent, a preparation method and application thereof, and belongs to the technical field of oilfield application chemical agents. The invention provides an organic chromium water shutoff profile control agent which comprises the following components in parts by weight: 5-8 parts of partially hydrolyzed polyacrylamide, 0.5-1 part of chromium acetate, 0.3-0.5 part of surfactant and 1000-1200 parts of water. The organic chromium water shutoff profile control agent provided by the invention has the advantages of good temperature resistance, acid and alkali resistance and thermal stability, good gelling performance, high gel strength, difficulty in crushing, long plugging time, low requirement on water quality, capability of being prepared from oilfield produced water, simple treatment process, low production cost and good economic benefit.
Description
Technical Field
The invention relates to the technical field of oilfield application chemical agents, in particular to an organic chromium water shutoff profile control agent and a preparation method and application thereof.
Background
The majority of domestic oil fields are land-phase deposited multi-oil-layer reservoirs, the permeability change among layers, in layers and on planes is large, the heterogeneity is high, when water injection development is carried out, injected water easily enters along the high-permeability layers in a burst mode, so that the injected water is not uniformly propelled longitudinally and on the planes, and the injected water enters into oil wells in a burst mode too early, so that the early flooding of the oil fields is caused. The injection of the profile control agent into the stratum can adjust the difference of the interlayer permeability, thereby achieving the purposes of adjusting the interlayer water absorption profile, controlling the water injection channeling and improving the water flooding efficiency.
As the development of oil fields enters the middle and later stages, the exploitation difficulty is increased continuously, and the well conditions are more complicated. Wells with high salinity (10000 mg/L-250000 mg/L) geological conditions are continuously appeared at high temperature (90-120 ℃). The common chemical profile control agent generally has the technical problem of weak gel strength in the practical application process, so that the gel strength of the water plugging profile control agent cannot be effectively ensured, the validity period of the gel in the stratum is influenced, and the crude oil recovery ratio of an oil field is influenced.
Disclosure of Invention
In view of the above, the invention aims to provide an organic chromium water shutoff profile control agent, and a preparation method and application thereof. The organic chromium water shutoff profile control agent provided by the invention has the characteristics of good gelling property and high gel strength, and can obviously improve the crude oil recovery rate.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an organic chromium water shutoff profile control agent which comprises the following components in parts by weight:
5-8 parts of partially hydrolyzed polyacrylamide, 0.5-1 part of chromium acetate, 0.3-0.5 part of surfactant and 1000-1200 parts of water.
Preferably, the surfactant is sodium dodecylbenzene sulfonate or sodium lignosulfonate.
Preferably, the number average molecular weight of the partially hydrolyzed polyacrylamide is 1500-2500 ten thousand.
Preferably, the water is oilfield produced water.
The invention also provides a preparation method of the organic chromium water shutoff profile control agent in the technical scheme, which comprises the following steps:
mixing water and partially hydrolyzed polyacrylamide, and curing to obtain a polymer aqueous solution;
and mixing the polymer aqueous solution, chromium acetate and a surfactant, and drying to form gel to obtain the organic chromium water plugging profile control agent.
Preferably, the temperature for drying and gelling is 70-90 ℃, and the time for drying and gelling is 5-12 h.
Preferably, the curing temperature is room temperature, and the curing time is 3-5 h.
The invention also provides the application of the organic chromium water shutoff profile control agent in the technical scheme or the organic chromium water shutoff profile control agent prepared by the preparation method in the technical scheme in oil exploitation.
The invention provides an organic chromium water shutoff profile control agent which comprises the following components in parts by weight: 5-8 parts of partially hydrolyzed polyacrylamide, 0.5-1 part of chromium acetate, 0.3-0.5 part of surfactant and 1000-1200 parts of water. According to the invention, chromium acetate with a specific mass part is added as a cross-linking agent and is subjected to cross-linking reaction with partially hydrolyzed polyacrylamide, so that the viscosity of the organic chromium water shutoff profile control agent can be effectively improved, and the gel strength is further improved; meanwhile, the gelling time can be shortened by taking the chromium acetate as a cross-linking agent, the gel strength of the organic chromium water plugging profile control agent is greatly reduced when the mass fraction of the chromium acetate is too low, and the gel strength of the organic chromium water plugging profile control agent is not obviously increased when the mass fraction of the chromium acetate is too high, but the preparation cost is high. The organic chromium water shutoff profile control agent provided by the invention has the characteristics of good temperature resistance, acid and alkali resistance and thermal stability and high gel strength, can effectively block a high-permeability oil layer, reduce vertical heterogeneity of the oil layer, can effectively displace residual oil in a high-permeability layer, improves the recovery ratio of crude oil, is not easy to break, has long blocking time and low requirement on water quality, can be prepared from oilfield produced water, and has the advantages of simple treatment process, low material cost and good economic benefit.
Furthermore, the invention adopts sodium dodecyl benzene sulfonate or sodium lignosulfonate as a surfactant, so that the profile control agent can uniformly enter pores of the stratum, and comprehensive plugging is realized.
Detailed Description
The invention provides an organic chromium water shutoff profile control agent which comprises the following components in parts by weight:
5-8 parts of partially hydrolyzed polyacrylamide, 0.5-1 part of chromium acetate, 0.3-0.5 part of surfactant and 1000-1200 parts of water, and further preferably 5 parts of partially hydrolyzed polyacrylamide, 0.5-1 part of chromium acetate, 0.3-0.5 part of surfactant and 1000 parts of water.
In the present invention, the chromium acetate, when used as a crosslinking agent, undergoes a reaction as shown in formulas 1 to 3:
high molecular weak acid radical + Cr3+Multinuclear hydroxyl bridge complex ion → crosslinked polymer formula 3
According to the invention, chromium acetate with a specific mass part is added as a cross-linking agent, so that the gel strength of the organic chromium water-plugging profile control agent can be effectively improved, chromium acetate can slowly release chromium ions existing in a mononuclear form in a polymer aqueous solution when the pH value is lower than 10.3, the mononuclear chromium ions are subjected to complexation, hydrolysis and hydroxyl bridging effects and further hydrolysis and hydroxyl bridging effects to produce polynuclear hydroxyl bridging ions of chromium, and the polynuclear hydroxyl bridging ions of chromium are cross-linked with polyacrylamide to form a colloid with high strength. The formed limited space of the long molecular chain of the cross-linked polymer is caused by the fact that the average distance between the chromium ion hydroxyl-matched polymers is reduced, so that the effective space of a high molecular chain is reduced, the cross-linking arrangement mode is compact, the size of a network is reduced, the density is increased, the gel strength is larger, the chromium acetate serving as a cross-linking agent can shorten the gel forming time, the gel strength of the organic chromium water plugging profile control agent is greatly reduced when the mass fraction of the chromium acetate is too low, the gel strength of the organic chromium water plugging profile control agent is not obviously increased when the mass fraction of the chromium acetate is too high, and the preparation cost is high.
In the present invention, the raw materials used are all commercial products which are conventional in the art, unless otherwise specified.
In the present invention, the surfactant is preferably sodium dodecylbenzenesulfonate or sodium lignin sulfonate. The adoption of the surfactant is beneficial to enabling the profile control agent to uniformly enter the pores of the stratum, so that the comprehensive plugging is realized; the dosage of the surfactant adopted by the invention reduces the cost on the basis of not influencing the gelling performance.
In the present invention, the number average molecular weight of the partially hydrolyzed polyacrylamide is preferably 1500 to 2500 ten thousand, and more preferably 2500 ten thousand. In the invention, the number average molecular weight of the partially hydrolyzed polyacrylamide can effectively reduce the production cost under the condition of ensuring that the organic chromium water shutoff profile control agent has excellent gel strength, temperature resistance and thermal stability.
In the present invention, the water is preferably oilfield produced water. The invention has no special requirement on water quality. The invention preferably selects the oilfield produced water for preparation, can reduce the cost and protect the environment.
The invention also provides a preparation method of the organic chromium water shutoff profile control agent in the technical scheme, which comprises the following steps:
mixing water and partially hydrolyzed polyacrylamide, and curing to obtain a polymer aqueous solution;
and mixing the polymer aqueous solution, chromium acetate and an additive, and drying to form gel to obtain the organic chromium water shutoff profile control agent.
The invention mixes water and partially hydrolyzed polyacrylamide for curing to obtain the polymer water solution. In the present invention, the mixing is preferably performed by stirring; the stirring speed is preferably 500 r/min; the mixing is preferably carried out in a stirrer. In the present invention, the aging is preferably performed under normal temperature and pressure conditions; the curing time is preferably 3-5 h. The specific operation mode of the curing is not particularly limited in the invention, and the curing mode which is conventional in the field can be adopted.
And after obtaining a polymer aqueous solution, mixing the polymer aqueous solution, chromium acetate and a surfactant, and drying to form gel to obtain the organic chromium water plugging profile control agent.
The mixing method of the present invention is not particularly limited, and any mixing method may be used. In the invention, the mixing time is preferably 1-3 h; the mixing rate is preferably 500 to r/min. The present invention preferably allows the crosslinking reaction to occur while mixing.
In the embodiment of the invention, the mixed solution obtained by mixing is sealed and then dried to form the gel; in laboratory tests, the mixed solution can be poured into an ampoule and sealed. In the invention, the temperature for drying and gelling is preferably 70-90 ℃; the drying and gelling time is preferably 5-12 h. In the invention, the drying and gelling are preferably carried out in an oven.
The invention also provides the application of the organic chromium water shutoff profile control agent in the technical scheme or the organic chromium water shutoff profile control agent prepared by the preparation method in the technical scheme in oil exploitation.
In the invention, the organic chromium water plugging and profile control agent is preferably suitable for strata with strong heterogeneity, low average permeability, high water content and high average temperature, and can easily enter deep regions of the strata to plug high permeability zones, displace residual oil in the high permeability zones and further improve the crude oil recovery ratio.
The following will explain the organic chromium water shutoff profile control agent provided by the present invention and its preparation method and application in detail with reference to the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The organic chromium water shutoff profile control agent in the embodiment comprises the following components in parts by weight:
5 parts of partially hydrolyzed polyacrylamide, 1 part of chromium acetate, 0.5 part of sodium dodecyl benzene sulfonate and 1000 parts of produced water of Liaohe oilfield.
The specific configuration method comprises the following steps:
(1) dispersing 5g of partially hydrolyzed polyacrylamide, dissolving the partially hydrolyzed polyacrylamide in 1000mL of water, and stirring for 3 hours to fully cure the partially hydrolyzed polyacrylamide to obtain an aqueous solution of the partially hydrolyzed polyacrylamide;
(2) sequentially adding 1g of chromium acetate and 0.5g of sodium dodecyl benzene sulfonate into the solution, and stirring for 1 hour to uniformly mix the chromium acetate and the sodium dodecyl benzene sulfonate;
(3) pouring the prepared mixed solution into an ampoule bottle, sealing, placing in a 70 ℃ oven, and gelling to obtain the organic chromium water shutoff profile control agent.
Example 2
In the embodiment, the organic chromium water shutoff profile control agent comprises the following components in parts by weight:
5 parts of partially hydrolyzed polyacrylamide, 0.5 part of chromium acetate, 0.3 part of sodium lignosulfonate and 1000 parts of produced water of Liaohe oilfield.
The preparation method is the same as that of example 1.
Evaluation experiment for gelling performance of organic chromium water-plugging profile control agent
Preparing an organic chromium water-plugging profile control agent according to the proportion in the embodiment 1-2, sealing the prepared profile control agent in an ampoule bottle, placing the ampoule bottle in a 70 ℃ oven, observing the gelling effect, shaking the ampoule bottle forcefully in the horizontal direction to observe whether the liquid profile control agent has fluidity, inverting the ampoule bottle when the liquid of the liquid profile control agent in the ampoule bottle loses fluidity to observe whether the liquid profile control agent flows downwards, if the liquid profile control agent cannot flow, considering that the profile control agent is completely gelled, taking out the ampoule bottle, smashing the ampoule bottle, and measuring the viscosity of the colloid in the ampoule bottle by using a rotational viscometer, wherein the result is shown in table 1.
The water shutoff profile control agent is prepared according to the proportion in the examples 1-2, the prepared profile control agent is sealed in an ampoule bottle and placed in a 70 ℃ oven, the ampoule bottle is stored for 3 months under the experimental condition, and the gel breaking time and the appearance change are observed after 3 months, and the results are shown in table 1.
TABLE 1 test results of gelling Properties of organic chromium based water shutoff profile control agents prepared in examples 1 to 2
| Sample (I) | Gel forming time h | Viscosity, 104mPa·s | Whether to break gel | Change in appearance |
| Example 1 | 5.5 | 10 | Without breaking the gel | Without change |
| Example 2 | 6.5 | 10 | Without breaking the gel | Without change |
The experimental data analysis of table 1 shows that the organic chromium water shutoff profile control agent prepared by the invention has short gelling time, high gelling speed, high viscosity and good gelling performance, which indicates that the organic chromium water shutoff profile control agent prepared by the invention has high gel strength.
Example 3
In the embodiment, the organic chromium water shutoff profile control agent comprises the following components in parts by weight:
5 parts of partially hydrolyzed polyacrylamide, 0.5 part of chromium acetate, 0.3 part of sodium lignosulfonate and 1000 parts of water.
The preparation method is the same as that of example 1.
In the preparation process, distilled water, deionized water and Liaohe oilfield produced water are respectively selected as water, and a sample 1, a sample 2 and a sample 3 are prepared.
The gelling properties of the prepared samples 1, 2 and 3 were tested, and the results of the test are shown in table 2.
Table 2 test results of gelling properties of the organic chromium water-plugging profile control agent prepared in example 3
From the analysis of the experimental data in table 2, it can be seen that the organic chromium water plugging profile control agent prepared by the invention has no special requirements on gelling speed, gelling time and viscosity value for water quality, and the produced water with wide oil field sources is preferably prepared for the purposes of reducing cost and protecting environment.
Example 4
Experiment for influence of pH value on gelling performance of organic chromium water shutoff profile control agent
Respectively weighing 5 parts of the organic chromium water plugging and profile control agent solution system prepared in the equal volume of the embodiment 1-2, and adjusting the pH value of the organic chromium water plugging and profile control agent solution system to 6-8. Sealing the prepared profile control agent in an ampoule bottle, placing the ampoule bottle in a 70 ℃ oven, observing the gelling effect, forcibly shaking the ampoule bottle in the horizontal direction to observe whether the liquid profile control agent has fluidity, inverting the ampoule bottle when the liquid of the liquid profile control agent in the ampoule bottle loses fluidity to observe whether the liquid flows downwards, if the liquid in the ampoule bottle cannot flow, considering that the profile control agent is completely gelled, taking out the ampoule bottle, smashing the ampoule bottle, and measuring the viscosity of the colloid by using a rotational viscometer, wherein the result is shown in table 3.
Table 3 results of the influence of pH values on gelling Properties of the organic chromium-based water shutoff profile control agents prepared in examples 1 to 2
The experimental data analysis of table 3 shows that the pH value has a weak influence on the gelling performance of the organic chromium water-plugging profile control agent, and the organic chromium water-plugging profile control agent prepared by the invention has good acid and alkali resistance, high gelling speed, high viscosity, good gelling performance and high gel strength.
Example 6
Core flow water plugging experiment
And (3) carrying out a displacement experiment on the organic chromium water shutoff profile control agent prepared in the embodiment 1-2 by adopting an artificial columnar rock core. The experiment adopts an artificial columnar core to simulate the stratum rock of a Liaohe oil field, the core specification is 100mm in length and 25mm in diameter, the low and high permeability type cores are adopted, and the experiment temperature is 70 ℃.
The results of the experiments are shown in Table 4.
TABLE 4 Water shutoff experiment results of the organic chromium water shutoff profile control agent prepared in examples 1 to 2
The experimental data analysis of table 4 shows that the organic chromium water shutoff profile control agent prepared by the invention has good core plugging effect, can resist shearing to form plugging after being injected into the stratum, and has slightly higher plugging effect on a high-permeability layer than a low-permeability layer because the strong shearing force of pores of the low-permeability layer weakens the plugging effect. After 24 hours and 72 hours of water plugging, the water plugging rate is not obviously changed, which indicates that the profile control agent does not break gel and has good stability.
Example 7
Oil displacement experiment
The method comprises the steps of saturating a crude oil in a rock core, carrying out profile control when the water content of the rock core is driven to 95% by water, enabling the dosage of a profile control agent to be 0.1 time of pore volume, adopting the organic chromium water plugging and profile control agent prepared in the embodiment 1-2 to carry out oil displacement experiments on the rock core with low, medium and high permeability respectively, and injecting the profile control agent and standing for 10 hours when the water content of an outlet end reaches more than 92% in the water displacement experiment process and then continuing the water displacement experiments. See table 5 for specific experimental results.
TABLE 5 oil displacement experiment results of organic chromium water shutoff profile control agents prepared in examples 1 to 2
From the analysis of the experimental data in table 5, it can be known that when the water content of the produced end is up to more than 92%, the water flooding can further improve the crude oil recovery rate after the organic chromium water plugging profile control agent prepared by the invention is injected into the produced end to be gelled.
Comparative example 1
In order to compare the invention, chromium acetate is used as a cross-linking agent compared with other compounds, so that the gel strength of the organic chromium water-blocking profile control agent can be effectively improved, the same amount of lignosulfonate, aluminum citrate, phenolic resin and inorganic chromium are respectively used for replacing chromium acetate in example 1 to prepare profile control agents of different cross-linking agents, the prepared profile control agent is sealed in an ampoule bottle and placed in an oven at 70 ℃, the gelling effect is observed, the ampoule bottle is shaken vigorously in the horizontal direction to observe whether the liquid profile control agent has fluidity, when the liquid of the liquid profile control agent in the ampoule bottle loses fluidity, the ampoule bottle is observed to see whether the liquid profile control agent flows downwards, if the liquid profile control agent cannot flow, the profile control agent is considered to be completely gelled, the ampoule bottle is taken out and broken, the viscosity of the colloid in the ampoule bottle is measured by using a rotational viscometer, and specific experimental results are shown in.
TABLE 6 results of experiments on gelling Properties of profile control agents with different crosslinking agents
The experimental data analysis of table 5 shows that the organic chromium water plugging profile control agent prepared by using chromium acetate as a cross-linking agent is most suitable for the change of the formation environmental conditions, and has excellent viscosity, good gelling performance and high gel strength in the environments with different temperatures and pH values.
Comparative example 2
In order to show that the adoption of the chromium acetate in parts by weight has important influence on the improvement of the gel strength of the organic chromium water plugging and profile control agent, different parts by weight of chromium acetate are respectively adopted to replace the parts by weight of chromium acetate in example 1, so as to prepare different organic chromium water plugging and profile control agents.
The organic chromium water shutoff profile control agent in the comparative example comprises the following components in parts by weight:
5 parts of partially hydrolyzed polyacrylamide and 0.1 part/0.3 part/0.5 part/1 part/1.5 part/2 parts of chromium acetate are respectively adopted, 0.5 part of sodium dodecyl benzene sulfonate and 1000 parts of produced water of Liaohe oil field.
TABLE 7 influence of chromium acetate addition on gelling Properties of organic chromium-based Water shutoff and Profile control Agents
From the analysis of the experimental data in table 7, it can be seen that when the concentration of chromium acetate is lower than 0.5 parts, the viscosity is reduced, which results in a substantial reduction of the gel strength, and when the concentration of chromium acetate is higher than 1 part, the gelling time is slightly increased, but the viscosity value is unchanged, and the gel strength is unchanged, so that the drug cost is considered, and the selected optimal concentration range is 0.5-1 part.
Comparative example 3
In the present invention, the surfactant is preferably sodium dodecylbenzenesulfonate or sodium lignin sulfonate. The adoption of the surfactant is beneficial to enabling the profile control agent to uniformly enter the pores of the stratum, so that the comprehensive plugging is realized; the dosage of the surfactant adopted by the invention reduces the cost on the basis of not influencing the gelling performance.
In order to illustrate the influence of adding the surfactant on improving the performance of the organic chromium water shutoff profile control agent, a sample P1 is prepared in example 1 without adding the surfactant, a sample P2 is prepared in example 2 without adding the surfactant, and the results of oil displacement experiments by preparing different organic chromium water shutoff profile control agents are shown in Table 8.
Table 8 oil displacement experimental results
From the analysis of the experimental data in table 8, it can be seen that the profile control agent prepared without adding a surfactant cannot completely and uniformly enter the heterogeneous formation, so that the water plugging rate and the profile control oil displacement recovery rate are reduced by a certain extent.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An organic chromium water shutoff profile control agent is characterized by comprising the following components in parts by mass:
5-8 parts of partially hydrolyzed polyacrylamide, 0.5-1 part of chromium acetate, 0.3-0.5 part of surfactant and 1000-1200 parts of water.
2. The organochromium water shutoff profile control agent according to claim 1, wherein the surfactant is sodium dodecylbenzenesulfonate or sodium lignosulfonate.
3. The organic chromium water shutoff profile control agent as claimed in claim 1, wherein the number average molecular weight of the partially hydrolyzed polyacrylamide is 1500-2500 ten thousand.
4. The organic chromium-based water shutoff profile control agent according to claim 1, wherein the water is oilfield produced water.
5. The preparation method of the organic chromium water shutoff and profile control agent as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
mixing water and partially hydrolyzed polyacrylamide, and curing to obtain a polymer aqueous solution;
and mixing the polymer aqueous solution, chromium acetate and an additive, and drying to form gel to obtain the organic chromium water shutoff profile control agent.
6. The preparation method of claim 5, wherein the temperature for drying and gelling is 70-90 ℃, and the time for drying and gelling is 5-12 h.
7. The preparation method according to claim 5, wherein the curing temperature is room temperature, and the curing time is 3-5 h.
8. The use of the organic chromium water shutoff profile control agent of any one of claims 1 to 4 or the organic chromium water shutoff profile control agent prepared by the preparation method of any one of claims 5 to 7 in oil exploitation.
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