CN107652960B - Enhanced emulsification type composite flooding composition containing sulfonate surfactant and application thereof - Google Patents
Enhanced emulsification type composite flooding composition containing sulfonate surfactant and application thereof Download PDFInfo
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- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 title claims abstract description 100
- 239000004094 surface-active agent Substances 0.000 title claims abstract description 83
- 239000000203 mixture Substances 0.000 title claims abstract description 68
- 239000002131 composite material Substances 0.000 title claims abstract description 56
- 238000004945 emulsification Methods 0.000 title claims abstract description 45
- 239000003208 petroleum Substances 0.000 claims abstract description 55
- -1 alkylbenzene sulfonate Chemical class 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003513 alkali Substances 0.000 claims abstract description 26
- 229920000642 polymer Polymers 0.000 claims abstract description 26
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims description 42
- 238000011084 recovery Methods 0.000 claims description 33
- 239000000839 emulsion Substances 0.000 claims description 23
- 239000010865 sewage Substances 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 150000003839 salts Chemical group 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 230000033558 biomineral tissue development Effects 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 77
- 239000002585 base Substances 0.000 description 22
- 238000006073 displacement reaction Methods 0.000 description 22
- 238000012360 testing method Methods 0.000 description 22
- 239000010779 crude oil Substances 0.000 description 20
- 238000000605 extraction Methods 0.000 description 13
- 230000001804 emulsifying effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 11
- 238000011160 research Methods 0.000 description 11
- 241000196324 Embryophyta Species 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 101100142275 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPL1A gene Proteins 0.000 description 5
- 101100142277 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPL1B gene Proteins 0.000 description 5
- 101100476983 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SDT1 gene Proteins 0.000 description 5
- 101100117358 Schizosaccharomyces pombe (strain 972 / ATCC 24843) doa10 gene Proteins 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 101150030969 ssm4 gene Proteins 0.000 description 5
- 150000004996 alkyl benzenes Chemical class 0.000 description 4
- 229940077388 benzenesulfonate Drugs 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000013112 stability test Methods 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000002280 amphoteric surfactant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002056 binary alloy Inorganic materials 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RZXLPPRPEOUENN-UHFFFAOYSA-N Chlorfenson Chemical compound C1=CC(Cl)=CC=C1OS(=O)(=O)C1=CC=C(Cl)C=C1 RZXLPPRPEOUENN-UHFFFAOYSA-N 0.000 description 1
- 235000003901 Crambe Nutrition 0.000 description 1
- 241000220246 Crambe <angiosperm> Species 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229960003237 betaine Drugs 0.000 description 1
- 239000011218 binary composite Substances 0.000 description 1
- 239000003876 biosurfactant Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011206 ternary composite Substances 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
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Abstract
The invention provides an enhanced emulsification type composite flooding composition containing sulfonate surfactant and application thereof, wherein the total weight of the enhanced emulsification type composite flooding composition is 100 percentWhich comprises the following steps: 0.05 to 0.3 weight percent of sulfonate composite surfactant, 0.1 to 0.25 weight percent of polymer, 0 to 1.2 weight percent of sodium carbonate and the balance of water; wherein, the sulfonate composite surfactant is composed of 5 wt% -95 wt% of petroleum sulfonate and 95 wt% -5 wt% of alkylbenzene sulfonate surfactant, wherein the total weight of the sulfonate composite surfactant is 100%. The enhanced emulsified composite flooding composition provided by the invention contains a sulfonate composite surfactant, and can enable the oil-water interfacial tension to reach ultralow order of magnitude under the condition of weak alkali or no alkali (C: (A)<1×10‑2mN/m), and the enhanced emulsification type composite flooding composition has stronger emulsification stability.
Description
Technical Field
The invention relates to an enhanced emulsified combination flooding composition containing a sulfonate surfactant and application thereof, belonging to the technical field of oil exploitation.
Background
At present, most of water-drive development oil fields of China main oil fields enter a double-high development stage with high water content and high extraction degree, and the difficulty of further improving the recovery ratio is increased. Meanwhile, with the increase of the demand pressure on oil and the further deepening of the exploitation degree of old oil fields, the importance of the technology for improving the recovery ratio of tertiary oil recovery is more and more obvious. The field test proves that the chemical compound flooding technology is one of effective methods for greatly improving the recovery ratio of the high-water-content oil field. The chemical compound flooding technology is a new method which is developed in the late eighties and can greatly improve the recovery ratio, and after more than 20 years of efforts, great progress is made in the aspects of surfactant development for oil displacement, formula system research, oil displacement mechanism research, compound flooding numerical simulation software development, mine test scheme design, injection and mining process research, mine test dynamic monitoring research and the like, so that the chemical compound flooding technology successfully enters the mine test research stage from indoor research. Since 1992, China has conducted a plurality of alkali-surfactant-polymer (ASP) ternary chemical combination flooding pilot mine tests and industrialized mine tests in Shengli, Daqing and Claritian oil fields in sequence. The tests of the mining fields belong to different oil zones, the oil reservoir conditions of the test zones are obviously different, but the tests of the chemical compound flooding mining fields have obvious effects, the enhanced recovery ratio of the chemical compound flooding is higher and is 15-25% (OOIP), and the method shows wide prospects for popularization and application of the chemical compound flooding technology.
The types of surfactants for oil displacement are mainly as follows: petroleum sulfonate, heavy alkylbenzene sulfonate, petroleum carboxylate, olefin sulfonate, lignin sulfonate, alcohol ether sulfonate, nonionic surfactant, biosurfactant, amphoteric surfactant, and the like. The first two surfactants have been used in field trials in the oil field. For example, the Daqing oil field adopts domestic heavy alkylbenzene sulfonate surfactant to obtain good oil increasing effect in strong base ASP ternary combination flooding field test, but new problems are continuously generated in field test research, for example, a formula system for mine field test uses strong base with higher concentration, the oil well is seriously scaled in some test areas, and the pump detection period is shortened, so that the technical difficulty and additional cost of oil extraction are increased, and the normal production of the oil well is even directly influenced; secondly, because the high alkali concentration has a great influence on the viscosity of the ternary system, in order to achieve the designed fluidity control capability, the concentration of the polymer in the formula system has to be increased, so that the cost of the oil displacement agent is increased; in addition, the dehydration treatment difficulty of the compound flooding produced fluid is high, and the oil extraction cost is increased.
Therefore, the existing compound flooding technology is changed from strong base ASP ternary compound flooding to weak base ASP ternary compound flooding or alkali-free SP binary compound flooding. The petroleum sulfonate suitable for the weak base ternary composite flooding system is also applied to Daqing oil fields, but the problems of adaptability of product performance to oil and water, improvement of product emulsifying performance and the like still exist. Long carbon chain betaine amphoteric surfactants have also begun to be employed in surfactant-polymer (SP) alkali-free combination flooding formulations. But the application is limited due to poor solubility and high price. In recent years, indoor research and field tests show that the emulsification performance has great influence on the effect of improving the recovery ratio of the compound flooding except for reducing the interfacial tension, particularly for weak-alkali ASP ternary and alkali-free SP binary compound flooding systems, the negative effect of alkali is weakened or eliminated, but the emulsification performance of the system is greatly weakened, particularly for alkali-free binary compound flooding systems, the emulsification performance is poor, and the oil displacement effect is poor. Recent research shows that the enhancement of the emulsifying property of the system is beneficial to the enhancement of the recovery ratio, and the proper emulsification is very important for improving the oil displacement effect of the compound flooding formula. Therefore, an emulsified weak-base ASP ternary or alkali-free SP binary compound flooding formula needs to be developed, and the emulsifying property of the surfactant is moderately improved mainly under the weak-base or alkali-free condition through the improvement of the surfactant formula, so that the oil displacement efficiency of the weak-base ternary or alkali-free binary compound flooding is enhanced while the side effect of the strong-base ternary compound flooding is reduced, and the field application effect of greatly improving the recovery ratio is realized. The development of a high-efficiency and harmless compound flooding formula is also the development direction and the research focus of the popularization and the application of chemical compound flooding in various oil reservoirs.
In summary, it is a technical problem to be solved in the art to provide an enhanced emulsion type composite flooding composition containing sulfonate surfactant and to use the enhanced emulsion type composite flooding composition in tertiary oil recovery.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, it is an object of the present invention to provide an enhanced emulsion type composite flooding composition containing a sulfonate surfactant.
The invention also aims to provide the application of the enhanced emulsified composite flooding composition containing the sulfonate surfactant in tertiary oil recovery.
In order to achieve the above object, the present invention provides an enhanced emulsification type compound flooding composition containing sulfonate surfactant, which comprises, based on 100% of the total weight of the enhanced emulsification type compound flooding composition:
0.05 wt% -0.3 wt% of sulfonate composite surfactant,
0.1 wt% to 0.25 wt% of polymer,
0 to 1.2 weight percent of sodium carbonate,
the balance of water;
wherein, the sulfonate composite surfactant is composed of 5 wt% -95 wt% of petroleum sulfonate and 95 wt% -5 wt% of alkylbenzene sulfonate surfactant, wherein the total weight of the sulfonate composite surfactant is 100%.
According to a specific embodiment of the present invention, in the enhanced emulsification-type composite flooding composition, preferably, the sulfonate complex surfactant consists of 50 wt% to 90 wt% of petroleum sulfonate and 50 wt% to 10 wt% of alkylbenzene sulfonate surfactant.
According to a specific embodiment of the present invention, in the enhanced emulsification-type composite flooding composition, preferably, the alkylbenzene sulfonate comprises a light alkylbenzene sulfonate or a heavy alkylbenzene sulfonate;
more preferably, the light alkylbenzene sulfonate has an average molecular weight of 337-357;
still more preferably, the average molecular weight of the heavy alkylbenzene sulfonate is 372-405. The light alkylbenzene sulfonate and the heavy alkylbenzene sulfonate used in the present invention are conventional substances in the art, and those skilled in the art can prepare the light alkylbenzene sulfonate and the heavy alkylbenzene sulfonate by conventional preparation methods or obtain the light alkylbenzene sulfonate and the heavy alkylbenzene sulfonate commercially.
According to a specific embodiment of the present invention, in the enhanced emulsification type composite flooding composition, preferably, the light alkyl benzene sulfonate is sodium light alkyl benzene sulfonate.
According to a specific embodiment of the present invention, in the enhanced emulsification type composite flooding composition, preferably, the heavy alkylbenzene sulfonate is sodium heavy alkylbenzene sulfonate.
According to a specific embodiment of the invention, in the enhanced emulsion-type composite flooding composition, the average molecular weight of the petroleum sulfonate is preferably 400-550, more preferably 430-530.
According to a specific embodiment of the invention, in the enhanced emulsification type composite flooding composition, preferably, the petroleum sulfonate comprises one or a combination of several of petroleum sulfonate sodium salt, petroleum sulfonate potassium salt and petroleum sulfonate ammonium salt;
more preferably, the petroleum sulfonate is petroleum sulfonic acid sodium salt.
According to a specific embodiment of the present invention, in the reinforced emulsion-type composite flooding composition, preferably, the average molecular weight of the polymer is 500-.
According to a specific embodiment of the present invention, in the reinforced emulsion-type composite flooding composition, preferably, the polymer includes one or a combination of several of polyacrylamide and salt-resistant polymer.
According to a specific embodiment of the present invention, in the enhanced emulsion-type compound flooding composition, preferably, the water is oilfield injection sewage;
more preferably, the mineralization degree of the oilfield injection sewage is 3000-30000 mg/L.
The invention also provides application of the enhanced emulsified composite flooding composition containing the sulfonate surfactant in tertiary oil recovery.
According to a particular embodiment of the invention, in said application, preferably said tertiary oil recovery comprises alkali-free binary combination flooding oil recovery or weak alkali ternary combination flooding oil recovery. When the enhanced emulsified composite flooding composition provided by the invention contains weak-base sodium carbonate, the enhanced emulsified composite flooding composition is an alkali-surfactant-polymer composite flooding composition and can be used for weak-base alkali-surfactant-polymer composite flooding oil extraction; when the enhanced emulsified compound flooding composition does not contain weak base sodium carbonate, the enhanced emulsified compound flooding composition is a binary (surfactant/polymer) compound flooding composition and can be used for alkali-free binary compound flooding oil recovery. The enhanced emulsification type composite flooding composition provided by the invention is used for a weak-alkali ternary or alkali-free binary composite flooding system, and the purpose of enhancing the emulsification performance of the system is achieved through a sulfonate composite surfactant, so that the recovery rate of tertiary oil recovery is improved.
In the past for developing surfactant oil displacement agents for chemical compound flooding, the oil and water are mainly considered to reach ultra-low interfacial tension, less attention is paid to the emulsifying property of the surfactant oil displacement agents, and in recent years, indoor research and field tests show that the emulsifying property has great influence on the recovery ratio improvement of the compound flooding besides the reduction of the interfacial tension, and particularly, the enhanced emulsification is beneficial to the recovery ratio improvement of a weak-alkali ASP ternary compound flooding system and an alkali-free SP binary compound flooding system. The purpose of achieving both ultralow interfacial tension and stronger emulsifying performance is difficult to achieve in the conventional single surfactant, but the enhanced emulsifying compound flooding composition containing the sulfonate surfactant, provided by the invention, contains the sulfonate compound surfactant (petroleum sulfonate and alkylbenzene sulfonate surfactant are compounded), and can enable the oil-water interfacial tension to reach ultralow order of magnitude under the condition of weak alkali or no alkali (the oil-water interfacial tension can reach ultralow order of magnitude: (the oil-water interfacial tension can reach the level of magnitude in the case of weak alkali or no alkali)<1×10-2mN/m), and the enhanced emulsification type composite flooding composition has stronger emulsification stability. Experiments prove that the system has certain adaptability to oil and water, the system has enhanced crude oil emulsifying capacity, and the indoor core oil displacement effect is good. Meanwhile, an indoor core oil displacement experiment shows that under the same condition, the recovery ratio of the enhanced emulsified weak base ternary complex flooding formula provided by the invention is 5.21% higher than that of a low-tension weak base ternary complex flooding formula (a conventional complex flooding composition adopted in the field).
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Raw materials are selected:
petroleum sulfonate DPS series, produced by Daqing refining company; petroleum sulfonate KPS series, produced by Xinjiang Clamayi refining company; the petroleum sulfonate FPS series is produced by a petrochemical company, wherein the petroleum sulfonate DPS series, the petroleum sulfonate KPS series and the petroleum sulfonate FPS series are petroleum sulfonate sodium salts.
Light alkylbenzene sulfonate LABS with average molecular weight of 337-357; HABS, average molecular weight 372-405.
Polyacrylamide HPAM, produced by Daqing refining company, has an average molecular weight of 1500-. The salt-resistant polymer KYPAM is produced by Beijing constant polymerization factories, and has the average molecular weight of 1500-.
Crude oil sample: the dehydrated crude oil of the north China oil field oil extraction plant and the dehydrated crude oil of the Xinjiang Cramayi oil field oil extraction plant.
Water sampling: injecting sewage into an oil extraction plant of an oil field in North China, wherein the mineralization degree is 9837 mg/L; the sewage is injected into Xinjiang Cramayi oil field oil extraction plants, and the mineralization degree is 13293 mg/L.
The interfacial tension test instrument adopts a TEXAS-500C rotary drop interfacial tension instrument, the interfacial tension test temperature is the reservoir formation temperature (54 ℃ in North China and 42 ℃ in Craya), and the interfacial tension test time is a stable equilibrium value of 2 hours.
Emulsion stability (S)te) The stability of emulsion formed after oil and water are fully emulsified by a certain amount of surfactant is shown, and the water separation rate (f) of the emulsion in a certain period of timev) The calculation formula of the emulsification stability index is as follows: ste＝1-fv。
Example 1
This example provides a series of enhanced emulsion-type combination flooding compositions containing sulfonate surfactants, wherein the enhanced emulsion-type combination flooding compositions include ternary combination flooding compositions and binary combination flooding compositions,
the ternary combination flooding composition comprises a sulfonate composite surfactant (90 wt% of petroleum sulfonate DPS and 10 wt% of heavy alkylbenzene sulfonate HABS), a polymer (HPAM 0.12 wt%), sodium carbonate and sewage injected by North China oil field oil production plants;
the binary combination flooding composition comprises a sulfonate composite surfactant (90 wt% of petroleum sulfonate DPS and 10 wt% of heavy alkylbenzene sulfonate HABS), a polymer (HPAM 0.12 wt%) and sewage injected by a North China oil field oil production plant; the contents of the components are shown in tables 2-3.
The interfacial tension and the system (binary system and ternary system) emulsification stability of the North China oilfield oil-water sample are tested, and the specific test results are shown in tables 1-3.
TABLE 1 Effect of petroleum sulfonate DPS as an active agent on North China crude oil/injected Sewage interfacial tension (mN/m) (HPAM 0.12 wt%)
TABLE 2 influence of sulfonate complex surfactant (SSM1) on North China crude oil/injected Sewage interfacial tension (mN/m) (HPAM 0.12 wt%)
Wherein the sulfonate complex surfactant (SSM1) described in Table 2 consists of 90 wt% petroleum sulfonate DPS and 10 wt% heavy alkylbenzene sulfonate HABS.
TABLE 3 emulsion stability test results for binary and ternary systems
The data in table 1 show that the single petroleum sulfonate DPS can enable the oil-water interfacial tension in North China to be ultralow in an alkali-free and weak-alkali compound flooding formula, and can achieve the ultralow interfacial tension in the range of 0.1-0.3% of surfactant concentration under the condition of no alkali addition; under the condition of adding alkali, the ultra-low interfacial tension can be achieved within the alkali concentration range of 0.2% -1.2% and the surfactant concentration range of 0.05% -0.3%.
Similarly, as can be seen from the data in table 2, the sulfonate complex surfactant SSM1 can also make the north China oil-water interfacial tension ultra-low in the alkali-free and weak alkali combination flooding formula, and can achieve ultra-low interfacial tension in the surfactant concentration range of 0.1% -0.3% without adding alkali; under the condition of adding alkali, the ultra-low interfacial tension can be achieved within the alkali concentration range of 0.2% -1.2% and the surfactant concentration range of 0.05% -0.3%.
From the results of the composite system emulsification performance measurement in table 3, the emulsification stability index measurement values of the binary and ternary combination flooding formula system of the single petroleum sulfonate DPS are only 5.28% and 5.65%, respectively, while the emulsification stability index measurement values of the binary and ternary combination flooding formula system of the sulfonate composite surfactant SSM1 can reach 19.43% and 21.33%, respectively. The results show that the single petroleum sulfonate DPS has poor crude oil emulsifying capacity, while the sulfonate complex surfactant SSM1 has improved crude oil emulsifying performance.
Example 2
This example provides an enhanced emulsion type combination flooding composition containing sulfonate surfactant, wherein the enhanced emulsion type combination flooding composition is an ASP combination flooding composition,
the three-element composite flooding composition comprises a sulfonate composite surfactant (90 wt% of petroleum sulfonate FPS and 10 wt% of light alkylbenzene sulfonate LABS), a polymer (KYPAM0.12 wt%), sodium carbonate and sewage injected by North China oil field oil extraction plants; the contents of the components are shown in tables 5-6.
The interfacial tension and the system (ternary system) emulsification stability of the North China oil field oil-water sample are tested, and the specific test results are shown in tables 4-6.
TABLE 4 influence of Petroleum sulfonate FPS as an active agent on North China crude oil/injected Sewage interfacial tension (mN/m) (KYPAM0.12 wt%)
TABLE 5 Effect of the complex surfactant (SSM2) on North China crude oil/injected Sewage interfacial tension (mN/m) (KYPAM0.12wt%)
Wherein the complex surfactant (SSM2) described in Table 5 consists of 90 wt% petroleum sulfonate FPS and 10 wt% light alkyl benzene sulfonate LABS.
TABLE 6 emulsion stability test results for ternary systems
As can be seen from the data in tables 4 and 5, the weak base ternary combination flooding formula of the petroleum sulfonate FPS and the sulfonate complex surfactant SSM2 can enable the oil-water interfacial tension in North China to be ultra-low, and the ultra-low interfacial tension can be achieved in the range of 0.2-1.2% of alkali concentration and 0.05-0.3% of surfactant concentration.
As can be seen from the results of the measurement of the emulsification performance of the ternary complex system in Table 6, the measured value of the emulsification stability index of the petroleum sulfonate FPS ternary complex flooding formula system is only 6.72%, and the emulsification stability index of the ternary complex flooding formula system of the sulfonate complex surfactant SSM2 can reach 22.66%. This shows that the performance of the sulfonate complex surfactant SSM2 emulsified crude oil is greatly improved.
Example 3
This example provides an enhanced emulsion compound flooding composition containing a sulfonate surfactant, wherein the enhanced emulsion compound flooding composition includes a three-component compound flooding composition and a two-component compound flooding composition,
the ternary combination flooding composition comprises a sulfonate composite surfactant (80 wt% of petroleum sulfonate KPS-1 and 20 wt% of heavy alkylbenzene sulfonate HABS), a polymer (KYPAM 0.13 wt%), sodium carbonate and sewage injected by a Xinjiang Cramayi oil field oil extraction plant;
the binary combination flooding composition comprises a composite surfactant (80 wt% of petroleum sulfonate KPS-1 and 20 wt% of heavy alkylbenzene sulfonate HABS), a polymer (KYPAM 0.13 wt%) and sewage injected by a Xinjiang Cramayi oil field oil extraction plant; the contents of the components are shown in tables 8-9.
The interfacial tension and the system (binary system and ternary system) emulsion stability of the oil-water sample of the oil field of the Clamayy Xinjiang are tested, and the specific test results are shown in tables 7-9.
TABLE 7 Effect of petroleum sulfonate KPS-1 as an active agent on Crayy crude oil/injected Sewage interfacial tension (mN/m) (KYPAM 0.13 wt%)
TABLE 8 influence of sulfonate complex surfactant (SSM3) on Crayy crude oil/injected sewage interfacial tension (mN/m) (KYPAM 0.13 wt%)
Wherein the complex surfactant (SSM3) described in Table 8 consists of 80 wt% petroleum sulfonate KPS-1 and 20 wt% heavy alkylbenzene sulfonate HABS.
TABLE 9 emulsion stability test results for binary and ternary systems
As can be seen from the data in tables 7 and 8, the single petroleum sulfonate KPS-1 and the sulfonate complex flooding surfactant SSM3 can both achieve the ultralow oil-water interfacial tension of Xinjiang Crayai under the condition of the alkali-free and weak-alkali complex flooding formula.
From the results of the composite system emulsification performance measurement in table 9, the results of the binary and ternary combination flooding formula system emulsification stability index measurement of the single petroleum sulfonate KPS-1 are only 7.19% and 7.67%, respectively, while the results of the binary and ternary combination flooding formula system emulsification stability index measurement of the sulfonate composite surfactant SSM3 can reach 27.93% and 28.71%, respectively. This indicates that the single petroleum sulfonate KPS-1 has poor crude oil emulsifying capacity, while the sulfonate complex surfactant SM3 has improved crude oil emulsifying performance.
Example 4
This example provides a series of enhanced emulsion type combination flooding compositions containing sulfonate surfactants, wherein the enhanced emulsion type combination flooding compositions are three-way combination flooding compositions,
the three-element composite flooding composition comprises sulfonate composite surfactant (83 wt% of petroleum sulfonate KPS-2 and 17 wt% of light alkylbenzene sulfonate LABS), polymer (KYPAM 0.13 wt%), sodium carbonate and sewage injected by Xinjiang Clarity oil field oil extraction plants; the contents of the components are shown in tables 10-11.
The interfacial tension and the system (ternary system) emulsification stability of the oil-water sample of the Clarity oil field are tested, and the specific test results are shown in tables 10-11.
TABLE 10 influence of sulfonate complex surfactant (SSM4) on Crayy crude oil/injected sewage interfacial tension (mN/m) (KYPAM 0.13 wt%)
Wherein the sulfonate complex surfactant (SSM4) described in Table 10 consists of 83 wt% petroleum sulfonate KPS-2 and 17 wt% light alkyl benzene sulfonate LABS.
TABLE 11 results of emulsion stability test of ternary system
As can be seen from the data in Table 10, the weak base triple flooding formulation of the sulfonate complex surfactant SSM4 enables the oil-water interfacial tension of crambe to be ultra-low, which can be achieved at base concentrations ranging from 0.2% to 1.2% and surfactant concentrations ranging from 0.05% to 0.3%.
As can be seen from the results of the measurement of the emulsification properties of the ternary complex system in Table 11, the measured value of the emulsification stability index of the petroleum sulfonate KPS-2 ternary complex flooding formula system is only 7.36%, while the emulsification stability index of the ternary complex flooding formula system of the sulfonate complex surfactant SSM4 can reach 30.32%. This shows that the performance of the sulfonate complex surfactant SSM4 emulsified crude oil is greatly improved.
Example 5 indoor core flooding experiment
1) Core oil displacement experimental method
The oil displacement experiment of the rock core adopts an artificial conglomerate rock core, the diameter of the rock core is 38mm, the length of the rock core is about 150mm, and the air permeability is 200 × 10-3μm2. Oil displacement experiment oil water adopts dehydrated crude oil and injected sewage samples of an oil extraction plant of a Clamayy oil field in Xinjiang.
Oil displacement experiment steps: the core saturated oil is firstly saturated at the displacement speed of 0.05mL/min, and is further saturated at the displacement speeds of 0.1mL/min, 0.2mL/min and 0.4mL/min after the oil breakthrough. And then performing water flooding oil displacement, wherein when the water content reaches 98%, the ternary combination flooding is injected, the injection volume of the combination flooding system is 0.5PV, and then the subsequent water flooding is injected until the water content reaches more than 98%. And recording the effluent water yield, the crude oil quantity and the pressure change in the displacement process, and calculating the crude oil recovery ratio.
2) Oil displacement experiment result of rock core
The surfactant of the low-tension weak-alkali ternary complex flooding system adopts a petroleum sulfonate KPS-1 sample in example 3, and the polymer adopts a salt-resistant polymer KYPAM; the surfactant of the enhanced emulsification type weak base ternary complex flooding system adopts the sulfonate complex surfactant SSM3 sample in example 3, and the polymer adopts salt-resistant polymer KYPAM. The results of the flooding experiments are shown in table 12.
Table 12 evaluation experiment results of core oil displacement efficiency
As can be seen from table 12, the recovery ratio of core waterflood of low-tension weak-alkali three-component flooding using petroleum sulfonate is 34.56%, the total recovery ratio of transferring to waterflood after injecting low-tension three-component flooding is 55.85%, and it can be seen that the recovery ratio is increased by injecting weak-alkali three-component flooding by 21.29%. The recovery ratio of the core water-drive of the enhanced emulsified weak base three-component composite flooding containing the sulfonate surfactant is 35.37%, the total recovery ratio of the transferred water after the enhanced emulsified three-component composite flooding is 61.87%, and as can be seen, the recovery ratio is increased to 26.50% by the enhanced emulsified weak base three-component composite flooding, and the phenomenon of strong emulsification of the produced liquid is observed in experiments. Comparison shows that the enhanced emulsification property of the emulsion type combination flooding formula can further improve the oil displacement efficiency of the formula, and under the same condition, the enhanced emulsification type weak base combination flooding formula improves the recovery ratio by 5.21 percent higher than that of the low-tension weak base combination flooding formula.
Claims (12)
1. An enhanced emulsification type composite flooding composition containing sulfonate surfactant, wherein the enhanced emulsification type composite flooding composition comprises the following components in percentage by weight of the total weight of the enhanced emulsification type composite flooding composition as 100 percent:
0.05 wt% -0.3 wt% of sulfonate composite surfactant,
0.1 wt% to 0.25 wt% of polymer,
0 to 1.2 weight percent of sodium carbonate,
the balance of water;
wherein, the sulfonate composite surfactant is composed of 5 wt% -95 wt% of petroleum sulfonate and 95 wt% -5 wt% of alkylbenzene sulfonate surfactant, wherein the total weight of the sulfonate composite surfactant is 100%;
the alkylbenzene sulfonate comprises light alkylbenzene sulfonate or heavy alkylbenzene sulfonate;
the average molecular weight of the petroleum sulfonate is 400-550;
the average molecular weight of the light alkylbenzene sulfonate is 337-357; the average molecular weight of the heavy alkylbenzene sulfonate is 372-405;
the polymer is polyacrylamide with the average molecular weight of 500-2500 ten thousand.
2. The enhanced emulsion compound flooding composition of claim 1 wherein the sulfonate complex surfactant consists of 50-90 wt% petroleum sulfonate and 50-10 wt% alkylbenzene sulfonate surfactant.
3. The enhanced emulsion compound flooding composition of claim 1 or 2 wherein the light alkylbenzene sulfonate is sodium light alkylbenzene sulfonate.
4. The enhanced emulsion compound flooding composition of claim 1 or 2 wherein the heavy alkylbenzene sulfonate is sodium heavy alkylbenzene sulfonate.
5. The enhanced emulsion type flooding composition as set forth in claim 1, wherein said petroleum sulfonate has an average molecular weight of 430-530.
6. The enhanced emulsification compound flooding composition according to claim 1 or 5, wherein the petroleum sulfonate comprises one or more of petroleum sulfonate sodium salt, petroleum sulfonate potassium salt and petroleum sulfonate ammonium salt.
7. The enhanced emulsified combination flooding composition according to claim 6 wherein said petroleum sulfonate is petroleum sulfonic acid sodium salt.
8. The enhanced emulsification type composite flooding composition as set forth in claim 1, wherein the polymer is salt-resistant polymer KYPAM with an average molecular weight of 1500-.
9. The enhanced emulsion-type flooding composition of claim 1 wherein said water is oilfield injection sewage.
10. The enhanced emulsified composite flooding composition as set forth in claim 9, wherein the mineralization of said oilfield injection wastewater is 3000-30000 mg/L.
11. Use of the sulfonate surfactant-containing enhanced emulsion flooding composition of any one of claims 1-10 in enhanced oil recovery.
12. Use according to claim 11, wherein the tertiary oil recovery comprises alkali-free binary combination flooding oil recovery or weak alkali ternary combination flooding oil recovery.
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