CN103342998B - A kind of adjusting driving agnet for oilfield polymer flooding - Google Patents
A kind of adjusting driving agnet for oilfield polymer flooding Download PDFInfo
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- CN103342998B CN103342998B CN201310314500.8A CN201310314500A CN103342998B CN 103342998 B CN103342998 B CN 103342998B CN 201310314500 A CN201310314500 A CN 201310314500A CN 103342998 B CN103342998 B CN 103342998B
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Abstract
The invention discloses a kind of adjusting driving agnet for oilfield polymer flooding.Described adjusting driving agnet is made up of aqueous solutions of polymers and conditioning agent; In described adjusting driving agnet, the mass percentage of described conditioning agent is 0.002% ~ 0.95%; Described conditioning agent is beta-cyclodextrin, chitosan or heavy alkyl benzene sulfonated petro-leum.The mass body volume concentrations of the described salt-resistant polymer aqueous solution is 600mg/L ~ 1750mg/L.Adjusting driving agnet provided by the invention, salt-resistant polymer associating intensity can be adjusted by the concentration adjusting conditioning agent, polymer molecule aggregate is made not only to meet and mate requirement between blowhole, and the mobility control ability of polymers soln can to take into account in reservoir each substratum to the demand of mobility controlling extent, improve the swept volume of polymers soln to greatest extent, and then acquisition best polymer drives oil increasing effect.
Description
Technical field
The present invention relates to the adjusting driving agnet of planting for oilfield polymer flooding, this adjusting driving agnet can improve polymkeric substance reservoir adaptability, and then can improve oilfield polymer flooding oil increasing effect.
Background technology
In recent years, the novel salt-resistant polymkeric substance characteristic such as good and emulsifying capacity is strong with its salt resistance (namely increasing stickiness in the polyelectrolyte aqueous solution good) and be subject to the great attention of petroleum science and technology worker, has played vital role in oilfield polymer flooding and the profile control and water pluggings etc. such as the large Khanh Hoa Bohai Sea.Salt-resistant polymer be generally by functional group between association or crosslinked action, formed there is " regionality " cancellated polymer molecule aggregate, macroscopically show stronger increasing stickiness.Aqueous Solution Viscosity principle is increased from polymkeric substance, viscosity is actually the macroscopic description of polymer molecular chain inclusion water molecules ability, it and polymer molecule the morphology of the aggregate are closely related, netted aggregate is stronger than linear branched chain aggregate envelope water molecules ability, increase glutinous effective, but the former molecular coil size is often much larger than the latter.Polymers soln Working environment is reservoir rock hole, and its bulk will be far smaller than the container of indoor prepared polymer solution, and this can affect association or the crosslinked action of polymkeric substance.If associated or crosslinked action occur in before polymers soln enters reservoir core, too high associating intensity can bring the compatibility issues between polymer molecule aggregate and pore dimension.In addition, actual oil reservoir is often made up of the substratum that multiple penetrating power is different, and polymers soln mobility controllability must take into account the actual demand of each substratum to mobility controlling extent, namely must consider the adaptability problem between polymkeric substance and reservoir.
Summary of the invention
The object of this invention is to provide a kind of adjusting driving agnet driven for oil field salt-resistant polymer, adjusting driving agnet provided by the invention can solve the poor technical problem of polymeric articles reservoir adaptability.Hydrophilic function (hydrophobic) group wrapped up with inner chamber hydrophobic annular special construction on salt-resistant polymer molecular chain of this adjusting driving agnet conditioning agent (for beta-cyclodextrin) taper exocoel, reduce until eliminate association between function (hydrophobic) group, and then reach telomerized polymer associating intensity and improve its reservoir adaptability object.
A kind of adjusting driving agnet for oilfield polymer flooding provided by the present invention, is made up of aqueous solutions of polymers and conditioning agent;
In described adjusting driving agnet, the mass percentage of described conditioning agent is 0.002% ~ 0.95%;
Described conditioning agent is beta-cyclodextrin, chitosan or heavy alkyl benzene sulfonated petro-leum.
In above-mentioned adjusting driving agnet, the mass body volume concentrations of described aqueous solutions of polymers is 600mg/L ~ 1750mg/L.
In above-mentioned adjusting driving agnet, the solute of described aqueous solutions of polymers is salt-resistant polymer, and described salt-resistant polymer can be hydrophobic associated polymer or poly table agent.
In above-mentioned adjusting driving agnet, described hydrophobic associated polymer can be AP-P4; The mass percentage of described conditioning agent is 0.002% ~ 0.08%.
In above-mentioned adjusting driving agnet, described poly table agent can be I type poly table agent; The mass percentage of described conditioning agent is 0.002% ~ 0.1%.
In above-mentioned adjusting driving agnet, described poly table agent can be III type poly table agent; The mass percentage of described conditioning agent is 0.003% ~ 0.95%.
According to reservoir rock mean permeability and aeolotropic characteristics, by adding the conditioning agent of suitable concentration in aqueous solutions of polymers, to associate between regulatory function (hydrophobic) group quantity, improve polymer molecule aggregate and the adaptability between reservoir rock pore texture and nonuniformity with this, may ultimately reach and improve polymer flooding oil increasing effect object.
The invention has the beneficial effects as follows: adjusting driving agnet provided by the invention, salt-resistant polymer associating intensity can be adjusted by the concentration adjusting conditioning agent, polymer molecule aggregate is made not only to meet and mate requirement between blowhole, and the mobility control ability of polymers soln can to take into account in reservoir each substratum to the demand of mobility controlling extent, improve the swept volume of polymers soln to greatest extent, and then acquisition best polymer drives oil increasing effect.
Accompanying drawing explanation
Fig. 1 is the relation curve in embodiment 1 between hydrophobic association polymer solution viscosity and beta-cyclodextrin concentration.
Fig. 2 is " refinery I type " relation curve between poly table agent Aqueous Solution Viscosity and beta-cyclodextrin concentration in embodiment 1.
Fig. 3 is " rich III type in sea " relation curve between poly table agent Aqueous Solution Viscosity and beta-cyclodextrin concentration in embodiment 1.
Fig. 4 is the schematic diagram of synthetic core used in the embodiment of the present invention, and wherein left figure is the schematic diagram of heterogeneous core, and right figure is the schematic diagram of many side pressures hole rock core.
Embodiment
The experimental technique used in following embodiment if no special instructions, is ordinary method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
Embodiment 1, conditioning agent are on the impact of Polymer Solution Viscosity
1.1, hydrophobic associated polymer
Regulate the concentration of beta-cyclodextrin, configure a series of adjusting driving agnet, polymkeric substance is hydrophobically associating polymer AP-P4 (Sichuan Guang Ya Science and Technology Co., Ltd.); Wherein the mass body volume concentrations of the hydrophobic associated polymer aqueous solution is 1750mg/L.
With beta-cyclodextrin concentration to hydrophobic association polymer solution viscosity test result in Table 1-1, corresponding relation curve is shown in Fig. 1.
Table 1-1 viscosity experimental data
Continued 1-1 viscosity experimental data
As can be seen from table 1-1, there is impact to hydrophobic association polymer solution viscosity in conditioning agent beta-cyclodextrin.Increase with beta-cyclodextrin concentration, hydrophobic association polymer solution viscosity presents that the initial stage declines fast, the later stage tends towards stability trend.Experimental data shows, when beta-cyclodextrin concentration is 0.08%, Associating Polymer Solution viscosity reaches a stationary value.This shows that on hydrophobic associated polymer molecular chain, hydrophobic grouping is all wrapped up, association completely dissolve.Therefore, 0.08% beta-cyclodextrin concentration is referred to as threshold concentration.
1.2 poly table agent
(1) " refinery I type " poly table agent
Regulate the concentration of beta-cyclodextrin, configure a series of adjusting driving agnet, polymkeric substance is " the refinery I type " poly table agent of producing purchased from Daqing Refinery company; Wherein the mass body volume concentrations of " refinery I type " poly table agent aqueous solution is 1750mg/L.
Polymer Solution Viscosity test result is in Table 1-2, and corresponding relation curve is shown in Fig. 2.
Table 1-2 viscosity experimental data
(2) " rich III type in sea " poly table agent
Regulate the concentration of beta-cyclodextrin, configure a series of adjusting driving agnet, polymkeric substance is " rich III type in the sea " poly table agent of producing purchased from Shanghai Hai Bo company; Wherein the mass body volume concentrations of " rich III type in sea " poly table agent aqueous solution is 1750mg/L.
Polymer Solution Viscosity test result is in Table 1-3, and corresponding relation curve is shown in Fig. 3.
Table 1-3 viscosity experimental data
As can be seen from table 1-2 and table 1-3, there is impact to poly table agent solution viscosity in conditioning agent beta-cyclodextrin.Increase with beta-cyclodextrin concentration, " refinery I type " poly table agent and " sea rich III type " poly table agent solution viscosity all present that the initial stage declines fast, the later stage tends towards stability variation tendency.Experimental data shows, when beta-cyclodextrin concentration is 0.1%, " refinery I type " poly table agent solution viscosity reaches stationary value, and when beta-cyclodextrin concentration is 0.95%, " rich III type in sea " poly table agent solution viscosity reaches stationary value.
Embodiment 2, conditioning agent are to polymer coils dimension D
himpact
For hydrophobic associated polymer, first adopt and inject water preparation 5000mg/L hydrophobic associated polymer mother liquor, leave standstill 24h under reservoir temperature 65 DEG C of conditions, then dilution is 1750mg/L polymers soln, add the conditioning agent beta-cyclodextrin of different amount, redilution is 20mg/L object liquid.D
htest result is in Table 2-1.
Table 2-1D
hexperimental data
As can be seen from table 2-1, increase with beta-cyclodextrin concentration, polymer coils dimension D
hreduce gradually.As can be seen here, conditioning agent can reduce quantity of associating between hydrophobic associated polymer hydrophobic grouping, reduces polymer molecule aggregate size, and then improves matching relationship between polymer molecule aggregate and reservoir rock hole.
Embodiment 3, conditioning agent are on the impact of polymers soln transmission migration ability
Resistance coefficient and residual resistance factor have reacted polymkeric substance overall Retention in porous medium to a certain extent, but it can not reflect that polymkeric substance distributes along the delay in porous media flows direction, and this distribution situation exists material impact again to polymer flooding sweep efficiency.At present, polymkeric substance adopts many pressure taps core experiment (rock core structure as shown in Figure 4) usually along the delay Evaluation on distribution in porous media flows direction, this experiment measuring polymer flow is rock core first half and latter half pressure reduction when rock core, by comparing the size of two pressure differences, and then migration ability is transmitted in porous medium to polymers soln make evaluation.
For hydrophobic associated polymer.Conditioning agent migrates capacity experimental result in Table 3-1 to hydrophobic association polymer solution transmission; Wherein in 2 schemes, the mass body volume concentrations of hydrophobic association polymer solution is 1750mg/L.
Table 3-1 pressure tap experimental data
As can be seen from table 3-1, and do not add compared with conditioning agent hydrophobic association polymer solution (scheme 3-1), modifier concentration is that the rock core first half pressure reduction of 0.004% hydrophobic association polymer solution is less, and latter half pressure reduction is larger.At the end of sequent water flooding, pressure reduction change still has similar trend.As can be seen here, after adding conditioning agent, hydrophobic association polymer solution reduces in rock core first half hold-up, and latter half increases, and shows that conditioning agent can improve polymers soln transmission migration ability.
Embodiment 4, conditioning agent are on the impact of polymers soln oil increasing effect
Regulate the concentration of beta-cyclodextrin, configure a series of adjusting driving agnet, wherein polymkeric substance is hydrophobic associated polymer.Modifier concentration affects experimental result in Table 4-1 to hydrophobic association polymer solution oil displacement efficiency.
Table 4-1 recovery ratio experimental data (heterogeneous core)
As can be seen from table 4-1, increase with modifier concentration, hydrophobic associated polymer associating intensity reduces, and Polymer Solution Viscosity reduces, and polymer flooding recovery ratio presents " first increases and then decreases " variation tendency.When modifier concentration is 0.002%, recovery ratio amplification is comparatively large, shows that now polymer molecule aggregate and rock core hole compatibleness are better, polymers soln and rock core nonuniformity adaptability stronger.
Claims (5)
1. for an adjusting driving agnet for oilfield polymer flooding, it is characterized in that: described adjusting driving agnet is made up of aqueous solutions of polymers and conditioning agent;
The mass body volume concentrations of described aqueous solutions of polymers is 600mg/L ~ 1750mg/L;
The solute of described aqueous solutions of polymers is salt-resistant polymer, and described salt-resistant polymer is hydrophobic associated polymer or poly table agent;
In described adjusting driving agnet, the mass percentage of described conditioning agent is 0.002% ~ 0.95%;
Described conditioning agent is beta-cyclodextrin.
2. adjusting driving agnet according to claim 1, is characterized in that: described hydrophobic associated polymer is AP-P4; The mass percentage of described conditioning agent is 0.002% ~ 0.08%.
3. adjusting driving agnet according to claim 1, is characterized in that: described poly table agent is I type poly table agent; The mass percentage of described conditioning agent is 0.002% ~ 0.1%.
4. adjusting driving agnet according to claim 1, is characterized in that: described poly table agent is III type poly table agent; The mass percentage of described conditioning agent is 0.003% ~ 0.95%.
5. adjusting driving agnet according to any one of claim 1-4 is improving the application in oilfield polymer flooding oil increasing effect.
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| CN103897084B (en) * | 2014-04-09 | 2016-01-13 | 中国海洋石油总公司 | A kind of Complex polymer and preparation method thereof and application |
| CN104327278B (en) * | 2014-10-24 | 2017-02-15 | 中海油天津化工研究设计院有限公司 | Hydrophobic associated polymer oil-displacing agent containing chitosan and preparation method of hydrophobic associated polymer oil-displacing agent |
| CN108587591A (en) * | 2018-05-30 | 2018-09-28 | 王召惠 | A kind of special viscosity stabiliser of polymer displacement of reservoir oil |
| CN111734374B (en) * | 2020-08-01 | 2022-06-14 | 西南石油大学 | Associative polymer combination oil displacement method for greatly improving heterogeneous oil reservoir recovery ratio |
| CN112964853B (en) * | 2021-01-21 | 2023-09-15 | 东北石油大学 | Method for determining dynamic retention of binary system aqueous solution at different positions of long rock core |
| CN113881422B (en) * | 2021-08-23 | 2023-04-07 | 成都工业学院 | Rheological property controllable polymer solution system and application thereof |
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| WO2010036729A2 (en) * | 2008-09-26 | 2010-04-01 | Bp Corporation North America Inc. | Wellbore treatment compositions |
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| CN1306554A (en) * | 1998-06-30 | 2001-08-01 | 阿克佐诺贝尔公司 | Aqueous concentrate of associative thickening polymer, and use of nonionic surfactant for reducing viscosity of concentrate |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: Northeast Petroleum University Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: Northeast Petroleum University |
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Effective date of registration: 20191212 Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC research institute limited liability company Patentee before: China Offshore Oil Group Co., Ltd. Co-patentee before: Northeast Petroleum University |
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