CN107674667B - Temperature-resistant high-calcium magnesium salt-resistant surfactant compound system - Google Patents
Temperature-resistant high-calcium magnesium salt-resistant surfactant compound system Download PDFInfo
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- CN107674667B CN107674667B CN201711074025.6A CN201711074025A CN107674667B CN 107674667 B CN107674667 B CN 107674667B CN 201711074025 A CN201711074025 A CN 201711074025A CN 107674667 B CN107674667 B CN 107674667B
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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Abstract
The invention discloses a temperature-resistant high-calcium magnesium salt-resistant surfactant compound system which is characterized by comprising the following components in percentage by weight: 0.02-0.80% of fatty alcohol ether gemini surfactant, 0.015-0.60% of tween 81 and 99.00-99.95% of formation water, fully stirring the components, and adjusting the pH to be neutral by using hydrochloric acid to obtain the surfactant compound system. The prepared surfactant compound system can enable the oil/water interfacial tension to reach the ultralow oil/water interfacial tension of 10-3 mN/m order of magnitude under the oil reservoir condition with higher calcium and magnesium ion content, and has excellent oil displacement performance and good stability.
Description
Technical Field
The invention relates to the technical field of oil extraction in oil fields, in particular to a temperature-resistant surfactant compound system suitable for a high-calcium-magnesium oil reservoir.
Background
The difficulty of stable production is high and the development situation is severe when the oil is exploited to the later stage. Under the current water drive condition, the recovery ratio is only 35-45%, and most of crude oil stays in the stratum and is difficult to recover. Surfactant flooding is one of the hot spots of tertiary oil recovery research at home and abroad as a way of effectively improving the recovery ratio of crude oil. At present, widely used oil displacement surfactants in oil fields mainly comprise anionic surfactants, nonionic surfactants and amphoteric surfactants. An important criterion in screening surfactant flooding systems is the ability to reduce the oil/water interfacial tension to 10-3mN/m order of magnitude. The surfactants currently used as oil displacement agents are various, mainly anionic sulfonates (petroleum sulfonate, alkylbenzene sulfonate, etc.) and carboxylates, and various nonionic surfactants such as OP series, etc. Anionic surfactants have good temperature resistance but poor calcium and magnesium ion resistance, while single nonionic surfactants have good salt resistance but poor temperature resistance, and single special surfactants such as fluorine-containing surfactants can not meet the requirement of ultra-low interfacial tension and are expensive.
The oil displacement effect of the surfactant used in oil extraction is closely related to geological conditions, and the higher the formation temperature is, the higher the content of calcium and magnesium ions in formation water is, and the more strict the requirements on the surfactant are. If the surfactant can only reduce the oil-water interfacial tension in a pure water/crude oil system, the surfactant is not enough to complete the tasks of emulsifying and displacing crude oil in an actual oil reservoir, so that the function of reducing the interfacial tension also needs to be maintained in a highly mineralized brine/crude oil system. A surfactant compounding system is usually used in a conventional system, and the surfactant compounding system can avoid the specific environmental sensitivity of a single surfactant, increase the anti-interference capability of the whole system and reduce the use risk of the surfactant.
The Chinese invention patent 201510784786.5 discloses a temperature-resistant and salt-resistant surfactant compound system and a compound method thereof, which consists of a sulfonate main agent, an anionic surfactant, an additive and a sacrificial agent, the composition has the advantages of high temperature resistance and high mineralization resistance, but the surfactant system disclosed by the invention has complex components, high cost and relatively poor surface activity. Chinese patent 200810023518.1 discloses a method for synthesizing fatty alcohol-polyoxyethylene ether sulfonate and compounding an oil displacement agent for tertiary oil recovery, the prepared fatty alcohol-polyoxyethylene ether sulfonate oil displacement system can effectively improve the crude oil recovery ratio of a high-temperature, high-salinity and high-calcium magnesium ion oil reservoir, but the oil displacement agent disclosed by the invention has the advantages of higher consumption, overhigh oil displacement cost and no good oil/water interfacial tension under the condition of higher calcium and magnesium ion content. Therefore, a high-efficiency surfactant oil displacement system or a plurality of high-efficiency surfactant oil displacement systems which have the advantages of remarkable synergistic effect, good stability and remarkable reduction of oil/water interfacial tension in an ultrahigh-calcium-magnesium oil reservoir environment are needed.
Disclosure of Invention
The invention aims to provide a temperature-resistant surfactant compound system suitable for high-calcium-magnesium oil reservoirs, aiming at the realistic situation that the existing surfactant oil displacement system has weak capacity of resisting temperature and calcium and magnesium ions.
The invention discloses a temperature-resistant high-calcium magnesium salt-resistant surfactant compound system which is characterized by comprising a fatty alcohol ether gemini surfactant, tween 81 and formation water, wherein the mass fraction of the fatty alcohol ether gemini surfactant is 0.02-0.80%, the mass fraction of the tween 81 is 0.015-0.60%, and the mass fraction of the formation water is 99.00-99.95%; the fatty alcohol ether gemini surfactant is one or more of dodecanol ether gemini surfactant, tetradecanol ether gemini surfactant, hexadecanol ether gemini surfactant and octadecanol ether gemini surfactant, and has a structural general formula as follows:
wherein M is metallic sodium ion, potassium ion or lithium ion; n is any even number from 12 to 18.
In the technical scheme, the formation water is oil field formation water or simulated formation water, the content of calcium and magnesium ions in the formation water is 500-5000 mg/L, and the total mineralization degree is 2000-100000 mg/L.
The preparation method of the temperature-resistant high-calcium magnesium salt-resistant surfactant compound system comprises the following steps:
(1) adding fatty alcohol ether gemini surfactant and tween 81 into formation water at normal temperature and pressure, and stirring for 0.5-2 hr;
(2) and (3) regulating the pH value of the mixed material in the step (1) to be neutral by using hydrochloric acid to obtain a surfactant compound system.
The temperature-resistant high-calcium magnesium salt-resistant surfactant compound system provided by the invention can form ultralow oil/water interfacial tension with crude oil, and has excellent oil displacement performance.
The temperature-resistant high-calcium magnesium salt-resistant surfactant complex system provided by the invention has better capability of reducing oil/water interfacial tension under a wider calcium and magnesium ion content, still has excellent performance under the oil reservoir condition with ultra-high calcium and magnesium ion concentration, and has good stability.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
0.08g of dodecanol ether bi-surfactant and 0.07g of Tween 81 are added into 99.85g of simulated formation water. The content of calcium and magnesium ions in the simulated formation water is about 2000 mg/L, and the total mineralization is about 60000 mg/L. Stirring for 0.5 hour to fully dissolve the surfactant, and then adjusting the pH of the system to be neutral by using hydrochloric acid to obtain a surfactant compound system.
Example 2
0.20g of tetradecanol ether gemini surfactant and 0.10g of Tween 81 are added to 99.70g of simulated formation water. The content of calcium and magnesium ions in the simulated formation water is 3000 mg/L, and the total mineralization degree is 30000 mg/L. Stirring for 1.5 hours to fully dissolve the surfactant, and then adjusting the pH of the system to be neutral by using hydrochloric acid to obtain a surfactant compound system.
Example 3
0.25g of hexadecanol ether gemini surfactant and 0.25g of Tween 81 are added into 99.50g of simulated formation water. The content of calcium and magnesium ions in the simulated formation water is 800 mg/L, and the total mineralization degree is 6000 mg/L. Stirring for 1.0 hour to fully dissolve the surfactant, and then adjusting the pH of the system to be neutral by using hydrochloric acid to obtain a surfactant compound system.
Example 4
0.55g of octadecanol ether gemini surfactant and 0.05g of Tween 81 are added into 99.40g of simulated formation water. The content of calcium and magnesium ions in the simulated formation water is 5000mg/L, and the total mineralization degree is 100000 mg/L. Stirring for 1.5 hours to fully dissolve the surfactant, and then adjusting the pH of the system to be neutral by using hydrochloric acid to obtain a surfactant compound system.
Example 5
The oil/water interfacial tension of the surfactant compound system prepared in examples 1 to 4 and the crude oil of the octahedral river oil field was measured at 50 to 80 ℃ by using a rotary oil drop/water interfacial tension meter. The test conditions were: the temperature is 50-80 ℃, the mass concentration of the surfactant is 0.3%, the content of calcium and magnesium ions in the simulated formation water is 5000mg/L, and the total mineralization degree is 100000 mg/L. The test results are shown in Table 1. It can be seen that the two surfactants in the composite surfactant oil displacement system provided by the invention have a certain synergistic effect, and show stronger capability of reducing oil/water interfacial tension under the condition of high-calcium-magnesium oil reservoir.
TABLE 1 oil/Water interfacial tension test results
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, additions and substitutions within the spirit and scope of the present invention.
Claims (3)
1. A temperature-resistant high-calcium magnesium salt-resistant surfactant compound system is characterized by comprising a fatty alcohol ether gemini surfactant, Tween 81 and formation water, wherein the fatty alcohol ether gemini surfactant accounts for 0.02-0.80% by mass, the Tween 81 accounts for 0.015-0.60% by mass, and the formation water accounts for 99.00-99.95% by mass; the fatty alcohol ether gemini surfactant is one or more of dodecanol ether gemini surfactant, tetradecanol ether gemini surfactant, hexadecanol ether gemini surfactant and octadecanol ether gemini surfactant, and has a structural general formula as follows:
wherein M is metallic sodium ion, potassium ion or lithium ion; n is any even number from 12 to 18.
2. The temperature-resistant high-calcium magnesium salt-resistant surfactant compound system as claimed in claim 1, wherein the formation water is oil field formation water or simulated formation water, the calcium and magnesium ion content of the formation water is 500-5000 mg/L, and the total mineralization degree is 2000-100000 mg/L.
3. The temperature-resistant high-calcium magnesium salt-resistant surfactant complex system according to claim 1, wherein the preparation method comprises the following steps:
(1) adding fatty alcohol ether gemini surfactant and tween 81 into formation water at normal temperature and pressure, and stirring for 0.5-2 hr;
(2) and (3) regulating the pH value of the mixed material in the step (1) to be neutral by using hydrochloric acid to obtain a surfactant compound system.
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| CN108285781B (en) * | 2018-03-19 | 2021-09-24 | 青岛大学 | Composite surfactant oil displacement system for high-calcium-magnesium oil reservoir |
| CN108311058B (en) * | 2018-03-19 | 2020-01-14 | 青岛大学 | Diphenyl propane-containing anionic Gemini surfactant and preparation method thereof |
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| AU717158B2 (en) * | 1995-06-13 | 2000-03-16 | Sun Chemical Corporation | Intaglio printing ink |
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