CN102061158A - Foam reinforcing polymer oil displacement agent and method - Google Patents
Foam reinforcing polymer oil displacement agent and method Download PDFInfo
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- CN102061158A CN102061158A CN2010105625805A CN201010562580A CN102061158A CN 102061158 A CN102061158 A CN 102061158A CN 2010105625805 A CN2010105625805 A CN 2010105625805A CN 201010562580 A CN201010562580 A CN 201010562580A CN 102061158 A CN102061158 A CN 102061158A
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Abstract
The invention provides a foam reinforcing polymer oil displacement agent which comprises a component A and a solvent B, wherein the component A comprises the following components in percentage by weight: 0.1-0.18 percent of surfactant, 0.15-0.25 percent of polymer, 7.5-9 percent of decomposition and gas production substance or/and gas production substances a and the balance of water; the solvent B comprises the following components in percentage by weight: 15-25 percent of gas production substance b and the balance of water; the decomposition and gas production substance is decomposed under a stratum condition to produce CO2 or/and N2; the gas production substances a and the gas production substance b can react to generate CO2 or/and N2; and decomposition products do not react with the gas production substance a. The invention also provides a foam reinforcing polymer oil displacement method. The foam reinforcing polymer oil displacement agent can be used for forming foam under the stratum condition through reaction by utilizing the gas production substances, and the generated foam is stable and uniformly distributed, thereby the recovery ratio of the crude oil is improved.
Description
Technical field
The present invention relates to the tertiary oil production in oil field technology, be specifically related to the method that a kind of foam strengthens polymer oil-displacing agent and strengthens the polymer oil-displacing agent displacement of reservoir oil with this foam.
Background technology
At present, domestic a lot of oil fields are in the stage of high moisture, high recovery percent of reserves, and comprehensive recovery ratio is lower, many wells low yield.The eighties in 20th century, China has developed the chemical flooding tertiary oil recovery technology.Tertiary oil recovery contrast primary oil recovery, secondary oil recovery.At the oil production initial stage, just utilize the natural energy recover petroleum on stratum to be primary oil recovery, recovery ratio only is about 10%; Method by coming recover petroleum to stratum water filling, gas injection is a secondary oil recovery, and recovery ratio generally also can only reach about 25% to 40%; Tertiary oil recovery then is to utilize means such as physics, chemistry and biology, continues the residual petroleum of recovery of subterranean.
The chemical flooding technology is in the flourish stage now, the chemical flooding research work of carrying out comprises that mainly polymer flooding, alkali-polymer flooding, tensio-active agent alkali drive, the binary combination flooding of surfactant and polymer, and alkali/tensio-active agent/polymer flooding etc.These chemical combined floodings have not only carried out indoor widely mechanism research, also carry out guiding test at the scene, have obtained obvious effects.
Wherein polymer flooding helps improving the fluidic sweep efficiency, but aqueous viscosity improves limited, more serious to the rate of permeation nonuniformity oil reservoir during polymer flooding, and the high viscosity of depending merely on polymkeric substance can not well improve sweep efficiency.Can in polymer oil-displacing agent, add foam at present, in the earth formation deep progradation, the gas-liquid drag effect that can utilize the high viscosity of polymkeric substance itself and disperse bubble to produce reaches the purpose that improves sweep efficiency jointly, produces effect thereby improve polyidal field.
But the foam great majority in the foam flooding finish of using on the oil field are formulated by gas and solution on the ground, or make the shaft bottom hydrops become foam by means of the stirring of downhole gas and the tensio-active agent of adding, bubble stability is poor, skewness in the stratum, application is very restricted at the scene.
Summary of the invention
The problem that the present invention solves is to provide a kind of foam to strengthen polymer oil-displacing agent, forms tiny foam by chemical reaction after can entering the stratum under reservoir condition, and foam can be dispersed in the polymers soln uniformly and stably.The present invention also provides and has utilized this foam to strengthen the method that polymer oil-displacing agent carries out the displacement of reservoir oil.
In order to solve the problems of the technologies described above, technical scheme of the present invention is:
A kind of foam strengthens polymer oil-displacing agent, comprises A component and B component:
The weight percent composition that described A component comprises is:
Tensio-active agent: 0.1%～0.2%
Polymkeric substance: 0.1%～0.25%
Among decomposition aerogenesis material and the aerogenesis material a one or both: 7.5%～9%
Water: surplus;
The weight percent composition that described B component comprises is:
Aerogenesis material b:15%～25%
Water: surplus;
Decompose the aerogenesis material and produce CO under formation condition, decomposing
2, N
2In the material of one or both gases, aerogenesis material a and aerogenesis material b can generate CO for reacting to each other
2, N
2In two kinds of materials of one or both gases, decompose aerogenesis material and aerogenesis material a and do not react.
As preferably, described decomposition aerogenesis material is one or both in supercarbonate or the Diisopropyl azodicarboxylate.
As preferably, described aerogenesis material a and aerogenesis material b are one or more in the following combination: aerogenesis material a is a urea, and aerogenesis material b is nitrite and acids; Aerogenesis material a is an ammonium chloride, and aerogenesis material b is a Sodium Nitrite; Aerogenesis material a is a carbonate, and aerogenesis material b is a mineral acid; Aerogenesis material a is a supercarbonate, and aerogenesis material b is a mineral acid.
As preferably, described tensio-active agent is one or more in sodium lauryl sulphate, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, sulfonated petro-leum, a-alkene sulfonate, polyoxyethylene alkyl ether sulfate salt, fatty acid soaps, spent pulping liquor enriched material, the sulfurous acid alcohol slops.
As preferably, described polymkeric substance is one or more in partially hydrolyzed polyacrylamide, hydrophobic associated polymer, amphiphilic polymers, heat-resistant salt-resistant monomer copolymer, the comb shaped polymer.
As preferably, the mass ratio of A component and B component is 2: 1～3: 1.
Utilize described foam to strengthen the flooding method of polymer oil-displacing agent, comprising:
The A component that described foam is strengthened polymer oil-displacing agent is injected the stratum earlier;
Continue to inject the B component according to whether there being aerogenesis material a to judge whether in the A component.
As preferably, do not contain aerogenesis material a in the A component according to whether having aerogenesis material a to judge whether in the A component to continue to add the B component to be specially, then only inject the A component, the B component of need not reinjecting.
As preferably, contain aerogenesis material a in the A component according to whether having aerogenesis material a to judge whether in the A component to continue to add the B component to be specially, then:
A) earlier described A component is injected the stratum;
B) the reinject mixing solutions of tensio-active agent and polymkeric substance;
C) inject the B component at last.
As preferably, in the step b) in the mixing solutions surfactant concentrations be 0.1%～0.18%, the concentration of polymkeric substance is 0.15%～0.25%.
Foam provided by the invention strengthens polymer oil-displacing agent and utilize the aerogenesis material formation foam that can react under formation condition, the foam stabilization that generates and being evenly distributed, add the foamy polymers soln and have higher resistance to flow and good mobility control ability, improved the recovery ratio of crude oil.
Description of drawings
Fig. 1 is water drive, the differential pressure curve figure that does not add foamy polymer flooding, polymer flooding provided by the invention.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, but should be appreciated that these describe just to further specifying the features and advantages of the present invention, rather than to the restriction of claim of the present invention.
Foam provided by the invention strengthens polymer oil-displacing agent and is made up of A component and B component.
The weight percent composition that the A component comprises is: 0.1%～0.2% tensio-active agent, and 0.1%～0.25% polymkeric substance, one or both among 7.5%～9% decomposition aerogenesis material and the aerogenesis material a are the water of surplus.The weight percent composition that the B component comprises is: 15%～25% aerogenesis material b, the water of surplus.Wherein decompose the aerogenesis material and produce CO under formation condition, decomposing
2, N
2In the material of one or both gases, aerogenesis material a and aerogenesis material b can generate CO for reacting to each other
2, N
2In two kinds of materials of one or both gases, decompose aerogenesis material and aerogenesis material a and do not react.
The mass ratio of A component and B component is 2: 1～3: 1.
The gas that foam enhancing polymer oil-displacing agent generates under formation condition among the present invention can be N
2, CO
2Or both mixed gass.Decomposition aerogenesis material is preferably one or both in supercarbonate or the Diisopropyl azodicarboxylate, and supercarbonate can be selected bicarbonate of ammonia for use, and the reaction equation of bicarbonate of ammonia under formation condition is:
The equation of the reaction that Diisopropyl azodicarboxylate takes place is:
Aerogenesis material a and aerogenesis material b react to each other can CO
2, N
2In one or both gases, aerogenesis material a and aerogenesis material b are preferably one or more in the following combination: aerogenesis material a is a urea, aerogenesis material b is nitrite and acids; Aerogenesis material a is an ammonium chloride, and aerogenesis material b is a Sodium Nitrite; Aerogenesis material a is a carbonate, and aerogenesis material b is a mineral acid; Aerogenesis material a is a supercarbonate, and aerogenesis material b is a mineral acid.
Urea and nitrite and acids react and generate CO
2, N
2, nitrite preferably uses Sodium Nitrite, and acids preferably uses HCl, and reaction equation is: CO (NH
2)
2+ 2NaNO
2+ 2HCl → CO
2↑+2N
2↑+2NaCl+3H
2O.
The reaction equation of ammonium chloride and Sodium Nitrite is: NaNO
2+ NH
4Cl → NaCl+2H
2O+N
2↑.
Carbonate and inorganic acid reaction, carbonate preferably use yellow soda ash, and mineral acid preferably uses hydrochloric acid, and reaction equation is: Na
2CO
3+ 2HCl → H
2O+CO
2↑+2NaCl.
Supercarbonate and inorganic acid reaction, supercarbonate preferably use sodium bicarbonate, and mineral acid preferably uses hydrochloric acid, and reaction equation is: NaHCO
3+ HCl → H
2O+CO
2↑+NaCl.
Owing in the process that generates gas, be accompanied by living thermal phenomenon, and added a large amount of decomposition aerogenesis materials or aerogenesis material a and the such inorganic salt of aerogenesis material b in the oil-displacing agent, so tensio-active agent and polymkeric substance require to have good heat resistance and stronger salt tolerance.
Tensio-active agent is preferably one or more in sodium lauryl sulphate, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, sulfonated petro-leum, a-alkene sulfonate, polyoxyethylene alkyl ether sulfate salt, fatty acid soaps, spent pulping liquor enriched material, the sulfurous acid alcohol slops.The main effect of tensio-active agent is to bubble, and reduces oil water interfacial tension simultaneously, reduces the corrosion of oil well and equipment, and emulsification reduces viscosity of crude.
Polymkeric substance is preferably one or more in partially hydrolyzed polyacrylamide, hydrophobic associated polymer, amphiphilic polymers, heat-resistant salt-resistant monomer copolymer, the comb shaped polymer.The main effect of polymkeric substance is a stable foam, the diffusion that the grid structure of polymkeric substance can stop fine foam to be, the speed of control reaction simultaneously, the mobility of increase oil-displacing agent.
The action principle that foam provided by the invention strengthens polymer oil-displacing agent is:
The A component is injected the stratum, decomposes the aerogenesis material and issues the reaction generation CO that separates estranged in the condition of the High Temperature High Pressure on stratum
2Or N
2, under the effect of tensio-active agent and polymkeric substance, form a large amount of stable foams.After perhaps A component and B component were injected the stratum respectively, aerogenesis material a in the A component and the aerogenesis material b in the B component reacted, and generated CO
2Or N
2, under the effect of tensio-active agent and polymkeric substance, form a large amount of stable foams then.Because gas is to generate in that the system with tackify is inner, helps the gas uniform distribution, prevented that the excessive of gas from scurrying.Tensio-active agent, the microbubble that has the polymkeric substance of high viscosity and can produce the vapour lock effect produce synergistic effect, and existing higher mobility control ability has stronger displacement efficiency again, can increase substantially the recovery ratio of crude oil.
Use flooding method poly-and the thing oil-displacing agent provided by the invention to be:
The A component that described foam is strengthened polymer oil-displacing agent is injected the stratum earlier;
Continue to inject the B component according to whether there being aerogenesis material a to judge whether in the A component.
When not containing aerogenesis material a in the A component, then only inject the A component, the B component of need not reinjecting.When containing aerogenesis material a in the A component, at first the A component is injected the stratum as first slug; The mixing solutions of preparing tensio-active agent and polymkeric substance then injects the stratum as second slug, and surfactant concentrations is 0.1%～0.2% in the mixing solutions, and the concentration of polymkeric substance is 0.1%～0.25%; At last the B component is injected the stratum as the 3rd slug, the generation foam that after down-hole first slug and the mixing of the 3rd slug, reacts, formation has a large amount of foamy foams enhancing polymer oil-displacing agents and carries out the displacement of reservoir oil.
Concrete laboratory reference embodiment, the component among the embodiment is on-the-spot preparation.
Embodiment 1:
A component: the sodium laurylsulfonate 0.12% of Tianjin chemical reagent company limited, the partially hydrolyzed polyacrylamide 0.16% of the good chemical industry in source, Shanghai company limited, bicarbonate of ammonia 8%, the water of surplus.
Embodiment 2:
A component: the hydrophobic associated polymer NAPs0.18% of part company limited as the a-alkene sulfonic acid sodium 0.13% of the neat safe chemical industry in Guangzhou company limited, Sichuan light subfamily skill, the urea 7.5% of chemical reagent company limited of Tianjin Jin Hui the Pacific-Asian, the water of surplus.
B component: Sodium Nitrite 11%, hydrochloric acid 5%, the water of surplus.
Embodiment 3:
The A component: the polyoxyethylenated alcohol sodium sulfate 0.15% that reaches chemical industry company limited, the comb shaped antisalt polymer KYPAM0.2% of Beijing Hengju Chemical Group Co., Ltd, the ammonium chloride 8.2% of the living flower bud chemical industry in Shanghai company limited, the water of surplus are contained in Guangzhou.
B component: Sodium Nitrite 18%, the water of surplus.
Embodiment 4:
A component: the sulfonated petro-leum 0.18% of the Feng Huagong company limited of Shanghai ancient cooking vessel, the NVP polymkeric substance 0.23% of Hainan Nan Hang pharmaceutcal corporation, Ltd, yellow soda ash 8.5%, the water of surplus.
B component: hydrochloric acid 20%, the water of surplus.
Comparative Examples:
Do not add the foamy polymer oil-displacing agent, contain the partially hydrolyzed polyacrylamide 0.13% of source, Shanghai good chemical industry company limited
During experiment, use artificial heterogeneous core to simulate, be of a size of 4.5cm * 4.5cm * 30cm, vertically divide three layers, each layer thickness is 1.5cm, and each layer rate of permeation is respectively 500md, 1500md and 4000md from top to bottom.At first carry out water drive by water filling port injection experiments water, water drive is carried out flooding method provided by the invention after artificial homogeneous rock core comprehensive water cut 98%, injects multiple and all gets 0.3PV, and experimental result sees Table 1:
Table 1 foam strengthens the oil displacement experiment result of polymer oil-displacing agent
By above experimental data as can be seen, the recovery ratio of the foam of embodiment 1-4 enhancing polymer oil-displacing agent is higher, can improve about 15%～18% than water drive.
Please refer to Fig. 1, Fig. 1 is water drive, the differential pressure curve figure that does not add foamy polymer flooding, polymer flooding provided by the invention.Do not add the polymer oil-displacing agent in the foamy polymer flooding use Comparative Examples, polymer flooding provided by the invention uses the foam among the embodiment 2 to strengthen polymer oil-displacing agent.1 differential pressure curve when being water drive, 2 for not adding the differential pressure curve of foamy polymer flooding, and 3 be the differential pressure curve of foam enhancing polymer flooding provided by the invention.When not adding the foamy polymer flooding, the 0.05MPa of injection production pressure difference during by water drive rises to 0.47MPa.When carrying out polymer flooding provided by the invention, injection pressure reduction is along with the increase of injection rate constantly increases, pressure reduction rises to 1.8MPa, and still have the trend of rising, injection production pressure difference is apparently higher than the pressure reduction of simple injection of polymer, and experiment does not have obvious has channeling, illustrates that foam provided by the invention strengthens polymer oil-displacing agent and under the condition that irreducible oil exists extraordinary stability arranged, and has stronger shutoff profile control ability.
Foam provided by the invention strengthens polymer oil-displacing agent after entering stratum or pit shaft, under formation condition, just produce gas and form a large amount of foams by chemical reaction, foam stabilization and being evenly distributed, and this foam strengthens polymer oil-displacing agent and has higher resistance to flow and good mobility control ability, improve the flowability of polymers soln, improve sweep efficiency, improve the recovery ratio of crude oil.
More than foam provided by the present invention is strengthened polymer oil-displacing agent and flooding method is described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. a foam strengthens polymer oil-displacing agent, it is characterized in that, comprises A component and B component:
The weight percent composition that described A component comprises is:
Tensio-active agent: 0.1%～0.2%
Polymkeric substance: 0.1%～0.25%
Among decomposition aerogenesis material and the aerogenesis material a one or both: 7.5%～9%
Water: surplus;
The weight percent composition that described B component comprises is:
Aerogenesis material b:15%～25%
Water: surplus;
Decompose the aerogenesis material and produce CO under formation condition, decomposing
2, N
2In the material of one or both gases, aerogenesis material a and aerogenesis material b generate CO for reacting to each other
2, N
2In the material of one or both gases, decompose aerogenesis material and aerogenesis material a and do not react.
2. foam according to claim 1 strengthens polymer oil-displacing agent, it is characterized in that described decomposition aerogenesis material is one or both in supercarbonate or the Diisopropyl azodicarboxylate.
3. foam according to claim 1 strengthens polymer oil-displacing agent, it is characterized in that described aerogenesis material a and aerogenesis material b are one or more in the following combination: aerogenesis material a is a urea, and aerogenesis material b is nitrite and acids; Aerogenesis material a is an ammonium chloride, and aerogenesis material b is a Sodium Nitrite; Aerogenesis material a is a carbonate, and aerogenesis material b is a mineral acid; Aerogenesis material a is a supercarbonate, and aerogenesis material b is a mineral acid.
4. foam according to claim 1 strengthens polymer oil-displacing agent, it is characterized in that described tensio-active agent is one or more in sodium lauryl sulphate, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, sulfonated petro-leum, a-alkene sulfonate, polyoxyethylene alkyl ether sulfate salt, fatty acid soaps, spent pulping liquor enriched material, the sulfurous acid alcohol slops.
5. foam according to claim 1 strengthens polymer oil-displacing agent, it is characterized in that described polymkeric substance is one or more in partially hydrolyzed polyacrylamide, hydrophobic associated polymer, amphiphilic polymers, heat-resistant salt-resistant monomer copolymer, the comb shaped polymer.
6. foam according to claim 1 strengthens polymer oil-displacing agent, and the mass ratio that it is characterized in that A component and B component is 2: 1～3: 1.
7. utilize the flooding method of each described foam enhancing polymer oil-displacing agent in the claim 1 to 6, it is characterized in that, comprising:
Earlier the A component of described polymer oil-displacing agent is injected the stratum;
Continue to inject the B component according to whether there being aerogenesis material a to judge whether in the A component.
8. whether flooding method according to claim 7 is characterized in that, according to there being aerogenesis material a to judge whether continue to add the B component in the A component being specially and not containing aerogenesis material a in the A component, then only injects the A component, the B component of need not reinjecting.
9. flooding method according to claim 7 is characterized in that, according to whether there being aerogenesis material a to judge whether continue to add the B component in the A component being specially and containing aerogenesis material a in the A component, then:
A) earlier described A component is injected the stratum;
B) the reinject mixing solutions of tensio-active agent and polymkeric substance;
C) inject the B component at last.
10. flooding method according to claim 9 is characterized in that, in the step b) in the mixing solutions surfactant concentrations be 0.1%～0.18%, the concentration of polymkeric substance is 0.15%～0.25%.
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