CN112877051A - Compact oil reservoir phase-permeation profile control agent and preparation method thereof - Google Patents
Compact oil reservoir phase-permeation profile control agent and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a compact oil reservoir phase permeation profile control agent and a preparation method thereof, wherein the profile control agent comprises the following components in percentage by weight: 5 to 15 percent of sulfobetaine amphoteric surfactant; 0.5-5% of super-strong phase permeation regulator, 5-10% of nonionic surfactant and 1-5% of auxiliary agent; 0-0.5% of intermediate and the balance of water. By adding the super strong phase permeation regulator, the oil washing efficiency and the water drive recovery ratio can be effectively improved. The invention also relates to a preparation method of the phase permeation profile control agent.
Description
Technical Field
The invention relates to a compact oil reservoir phase permeability profile control agent and a preparation method thereof, belonging to the technical field of fine chemicals and oil-gas field development.
Background
The compact oil reserves are abundant, are another new focus in the field of unconventional oil and gas reservoir exploration and development following shale gas, and are praised as 'black money' by the oil industry. But the method is lack of effective development technical means, the reserve utilization degree is low, and the effective development of the compact oil reservoir can effectively relieve the current situation of the lack of petroleum resources in China to a certain extent. From the development degree and the development effect, the oil and gas yield proportion of the low-permeability compact oil and gas field is gradually increased, but the recovery ratio of the low-permeability reservoir is always at a lower level compared with the recovery ratio of the medium-high permeability reservoir.
The imbibition oil recovery mainly depends on capillary force to realize imbibition and oil drainage, the imbibition process is a process that a wetting phase (usually water phase) fluid enters a porous medium under the action of capillary force and a non-wetting phase (oil phase) fluid is replaced, the imbibition effect has important practical significance for improving the crude oil recovery rate of a tight oil reservoir and can further improve the crude oil recovery rate. In recent years, the imbibition oil extraction technology is highly emphasized by the majority of petroleum technologists due to the advantages of simple technology, low operation cost and good oil increasing effect, and is hopeful to become one of the effective measures for the development of compact oil reservoirs under the condition of low oil price.
The hydrophilicity of the surface of the core is enhanced, the temperature is increased, the viscosity of crude oil is reduced, and the imbibition recovery ratio is gradually increased. For a tight oil reservoir, the hydrophilicity is weak, and the imbibition oil displacement is often easily influenced by reservoir physical properties, interfacial tension, rock wettability and well-entering fluid characteristics, so that the process is complex, which undoubtedly provides a greater challenge for the crude oil recovery of the tight oil reservoir. Therefore, how to improve the seepage and absorption performance to enhance the capillary force effect in the seepage and absorption process is highly valued by oil field workers.
The existing imbibition oil production technical principle is combined with the conventional oil displacement technology, and a multifunctional profile control and flooding technical system is realized by developing and using the displacement and compounding of the super-strong imbibition agent and the surfactant suitable for the compact oil reservoir, so that the complex process is simplified. The profile control agent has the capabilities of adjusting the stratum imbibition pressure, adjusting the oil-water flow resistance, adjusting the interfacial tension of the core surface and the like; has the advantages of high stripping and falling efficiency of crude oil and realization of the effect of improving the oil displacement rate.
Disclosure of Invention
Aiming at the problems in the actual compact crude oil exploitation, the invention aims to provide a phase-permeation modifying and flooding agent based on a phase-permeation modifying and permeating agent and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that the tight oil reservoir phase permeability profile control agent and the preparation method thereof, wherein the tight oil reservoir phase permeability profile control agent at least comprises the following components in percentage by mass: 5 to 15 percent of sulfobetaine amphoteric surfactant; 0.5 to 5 percent of super-strong phase permeation regulator and 5 to 10 percent of nonionic surfactant; 0 to 5 percent of auxiliary agent; 0-0.5% of intermediate and the balance of water.
The structural schematic diagram of the phase permeation regulator is as follows:
wherein: r is C8-C12 alkyl, the number n of oxyethylene groups is 3-5, the length m of the middle carbon chain is 4-6, and X is-Is halogen anion Cl-Or Br-。。
The preparation process comprises the following steps:
(1) reacting fatty amine polyoxyethylene ether with dihaloalkane, and evaporating to remove the solvent to obtain a dialkyl polyoxyethylene diquaternary ammonium salt intermediate;
wherein, in the polyoxyethylene ether fatty tertiary amine, the fatty group R is C8-C12 alkyl, and the polymerization degree n of the polyoxyethylene ether is 3; the dihalogenated alkane is one of 1, 4-dichlorobutane, 1, 4-dibromobutane, 1, 6-dichlorohexane and 1, 6-dibromohexane; reactant polyoxyethylene ether fatty tertiary amine: the molar ratio of the dihalogenated alkane is 2: 1.0-1.2, the solvent is water or isopropanol-water solution, the volume ratio of isopropanol to water in the isopropanol-water solution is 1-2: 1, and the reaction is carried out at the temperature of 80-110 ℃ for 6-10 hours
(2) Reacting the intermediate with halogenated ethyl sodium sulfonate in the presence of sodium hydroxide to obtain a phase permeation regulating penetrant;
wherein the solvent is isopropanol-water solution, the reaction is carried out for 5-8 hours at 70-90 ℃, the pH value of the system is kept at 8-9 by using sodium hydroxide water solution, the volume ratio of the isopropanol to the water in the reaction solvent isopropanol-water is 2:1, and the halogenated ethyl sodium sulfonate is one of chloroethyl sodium sulfonate or bromoethyl sodium sulfonate.
(3) Preparing a dialkyl polyoxyethylene diquaternary ammonium salt intermediate according to the step (1), weighing the components according to the mass percentage, and uniformly stirring to obtain the compact oil reservoir phase permeation profile control agent.
Preferably, the selected sulfobetaine amphoteric surfactant is one or a mixture of alkyl hydroxypropyl sulfobetaine, alkyl sulfopropyl betaine and alkyl ethoxy sulfobetaine. More preferably, the alkyl group in the sulfobetaine amphoteric surfactant is a C8-C14 alkyl group.
Preferably, the selected nonionic surfactant is one of alkylphenol ethoxylates or fatty alcohol polyoxyethylene ethers.
Preferably, the number of the oxyethylene groups of the alkylphenol polyoxyethylene ether or the fatty alcohol polyoxyethylene ether is 7-15.
Preferably, the auxiliary agent is a monohydric aliphatic alcohol, preferably a C2-C4 aliphatic alcohol.
An optimal compact oil reservoir phase permeation profile control and flooding agent and a preparation method thereof are characterized in that 9.0g of dodecyl dimethyl hydroxypropyl sulfobetaine, 1.0g of super strong phase permeation regulator, 7.0g of AEO-9, 3.0g of ethanol and 0.5g of intermediate are weighed, water is added to supplement 100g, and the mixture is uniformly stirred to obtain the compact oil reservoir phase permeation profile control and flooding agent.
The invention provides a tight oil reservoir phase-permeation profile control and flooding agent and a preparation method thereof.0.5-5% of tight oil reservoir phase-permeation profile control and flooding agent aqueous solution is applied to chemical products for oil extraction for improving the recovery ratio in the process of tight crude oil extraction.
The invention has the following excellent effects:
(1) the invention has the advantages of easily obtained raw materials, simple and safe process and low production process cost.
(2) The phase permeation regulating penetrant in the profile control agent has the structure containing sulfonic acid groups, has the properties of salt resistance, temperature resistance and low critical micelle concentration, has good crude oil stripping performance, is used in a dense oil reservoir phase environment, and has stable molecular structure and chemical properties. Cation groups in the structure of the phase permeation regulating penetrant are chemically combined with stratum adsorption, the long-acting property is good, strong hydrophilicity is created by anion groups, the permeability is increased by a plurality of groups, stripping and falling of crude oil are facilitated, the chain length of alkane is controlled, wetting inversion is prevented, and sulfonate is salt-resistant and temperature-resistant.
(3) The phase permeation regulator used in the profile control agent is a multifunctional group, has good stability, is firmly combined with a rock core, has strong permeability, simple preparation process, is easy for large-scale production, and does not generate pollutant emission.
(4) In the profile control agent, various surfactants are compounded to achieve the comprehensive effects of adjusting the phase permeability, changing the wettability, reducing the interfacial tension, improving the displacement efficiency and reducing the oil-water flow resistance, and the profile control agent is more beneficial to releasing water lock and improving the oil displacement rate.
Detailed Description
The present invention will be further described with reference to the following examples.
The following description is only a preferred embodiment of the present invention, and it should be understood that the present invention is not limited to the following embodiments, and all the inventions using the concept of the present invention are protected by the following modifications without departing from the principle of the present invention. The raw materials and the solvent are all common commercial products.
The contact angle and surface tension measuring method of the invention comprises the following steps: preparing 0.5 percent of profile control agent aqueous solution by mass percent, and measuring the surface tension; the slide glass is hung and soaked in the solution, aged for 42 hours at 70 ℃, taken out, dried for 4 hours at 105 ℃, and the contact angle of water wetting is measured.
Example 1
5.0g of dodecyl dimethyl hydroxypropyl sulfobetaine, 3.0g of super strong phase permeation regulator, 10.0gOP-10 g of isopropanol and 3.0g of water are taken, the balance of 100g of water is added, and the mixture is stirred uniformly to obtain the dense oil reservoir phase permeation profile control flooding agent. The contact angle was 66 ℃ and the surface tension was 28.8 mN/m.
Example 2
Taking 10.0g of dodecyl dimethyl hydroxypropyl sulfobetaine, 1.5g of super strong phase permeation regulator, 5.0g of AEO-9 and 5.0g of n-butyl alcohol, adding water to supplement 100g, and uniformly stirring to obtain the compact reservoir phase permeation profile control flooding agent. The contact angle was 68 ℃ and the surface tension was 28.5 mN/m.
Example 3
15.0g of decyl dimethyl hydroxypropyl sulphobetaine, 1.5g of super strong phase permeation regulator and 5.0gOP-10 are taken, water is added to complement 100g, and the mixture is stirred uniformly to obtain the dense oil reservoir phase permeation profile control flooding agent. Contact angle 72 DEG, surface tension 28,2 mN/m.
Example 4
And adding water to complement 100g of 10.0g of decyl dimethyl sulfopropyl betaine, 1.0g of super strong phase permeation regulator, 7.0gOP-7 g of isopropanol and 3.0g of isopropanol, and uniformly stirring to obtain the dense oil reservoir phase permeation profile control flooding agent. The contact angle was 63 ℃ and the surface tension was 28.6 mN/m.
Example 5
Taking 5.0g of tetradecyl dimethyl hydroxypropyl sulfobetaine, 5.0g of super strong phase permeation regulator, 5.0g of AEO-9 and 1.0g of isopropanol, adding water to complement 100g, and uniformly stirring to obtain the compact reservoir phase permeation profile control flooding agent. The contact angle was 58 ℃ and the surface tension was 28.4 mN/m.
Example 6
And adding water to complement 100g of 9.0g of dodecyl dimethyl hydroxypropyl sulfobetaine, 1.0g of super strong phase permeation regulator, 7.0g of AEO-9, 3.0g of ethanol and 0.5g of intermediate, and uniformly stirring to obtain the compact reservoir phase permeation profile control flooding agent. The contact angle was 93 ℃ and the surface tension was 29.1 mN/m.
Example 7
The tight oil reservoir phase-permeation profile control agent prepared in the examples 1 to 6 is further subjected to a water lock releasing and recovery efficiency improving effect test experiment.
The experimental method comprises the following steps: pre-saturating a rock core by using a profile control agent aqueous solution with a certain concentration, placing the saturated rock core in a rock core holder, displacing the rock core by using kerosene at 90 ℃, wherein the displacement is 2ml/min until no water is produced, recording the highest (and balanced) displacement pressure and the volume of finally-expelled water, and calculating the water extraction degree. Then using the water solution of the profile control agent with the same concentration to drive the oil to the water content of 98 percent, recording the highest (and balanced) displacement pressure of the water drive oil and the volume of the finally driven oil, and calculating the extraction degree of the crude oil.
The experiment adopts an artificial rock core, and the permeability is 35-45 mu m2The pore volume is 8.5-10 ml, the profile control agent aqueous solution is 1% of the profile control agent aqueous solution of the compact reservoir of the embodiment 1-6, and the control group is1% KCl aqueous solution, and the experimental results are shown in Table 1.
Table 1 examples 1-6 experimental results
If the pressure of the oil-drive dialyzate is lower than that of the control group, the higher the extraction degree is, the imbibition liquid has the function of relieving water lock, and the imbibition liquid has strong capability of improving the oil well productivity. If the water-driving oil pressure is lower than that of the control group, the flow pressure of the crude oil of the rock core and the flow pressure of the oil-water phase are reduced, which is beneficial to improving the productivity of the crude oil. The oil-water displacement recovery ratio is higher than that of a control group, and the water displacement sweep efficiency and the oil washing efficiency can be improved after the treatment of imbibition liquid.
Deducting the consistency difference of the rock core, and as seen from the table 1, the compact oil reservoir phase-permeation profile control agent has higher water-lock release, reduces the oil-water flow resistance and has better oil displacement efficiency.
Claims (10)
1. The tight oil reservoir phase permeation profile control agent is characterized by comprising the following components in percentage by weight: 5 to 15 percent of sulfobetaine amphoteric surfactant; 0.5-5% of phase permeation regulator and 5-10% of nonionic surfactant; 0 to 5 percent of auxiliary agent; 0-0.5% of dialkyl polyoxyethylene based diquaternary ammonium salt intermediate, and the balance of water.
2. The tight reservoir phase-permeation modifying and flooding agent and the preparation method thereof as claimed in claim 1, characterized in that the structural schematic diagram of the phase-permeation modifying agent is as follows:
wherein: r is C8-C12 alkyl, the number n of oxyethylene groups is 3-5, the length m of the middle carbon chain is 4-6, and X is-Is halogen anion Cl-Or Br-。
3. The tight reservoir phase-permeation profile control agent and the preparation method thereof according to claim 1, wherein the preparation process comprises the following steps:
(1) reacting fatty amine polyoxyethylene ether with dihaloalkane, and evaporating to remove the solvent to obtain a dialkyl polyoxyethylene diquaternary ammonium salt intermediate;
wherein, in the polyoxyethylene ether fatty tertiary amine, the fatty group R is C8-C12 alkyl, and the polymerization degree n of the polyoxyethylene ether is 3; the dihalogenated alkane is one of 1, 4-dichlorobutane, 1, 4-dibromobutane, 1, 6-dichlorohexane and 1, 6-dibromohexane; reactant polyoxyethylene ether fatty tertiary amine: the molar ratio of the dihalogenated alkane is 2: 1.0-1.2, the solvent is water or isopropanol-water solution, the volume ratio of isopropanol to water in the isopropanol-water solution is 1-2: 1, and the reaction is carried out at the temperature of 80-110 ℃ for 6-10 hours
(2) Reacting the intermediate with halogenated ethyl sodium sulfonate in the presence of sodium hydroxide to obtain a phase permeation regulating penetrant;
wherein the solvent is isopropanol-water solution, the reaction is carried out for 5-8 hours at 70-90 ℃, the pH value of the system is kept at 8-9 by using sodium hydroxide water solution, the volume ratio of the isopropanol to the water in the reaction solvent isopropanol-water is 2:1, and the halogenated ethyl sodium sulfonate is one of chloroethyl sodium sulfonate or bromoethyl sodium sulfonate.
(3) Preparing a dialkyl polyoxyethylene diquaternary ammonium salt intermediate according to the step (1), weighing the components according to the mass percentage, and uniformly stirring to obtain the compact oil reservoir phase permeation profile control agent.
4. The tight reservoir phase-permeability profile control agent and the preparation method thereof as claimed in claim 1, wherein the sulfobetaine amphoteric surfactant is one or a mixture of alkyl hydroxypropyl sulfobetaine, alkyl sulfopropyl betaine and alkyl ethoxy sulfobetaine.
5. The tight reservoir phase-permeability profile control agent and the preparation method thereof as claimed in claim 4, wherein the alkyl group in the sulfobetaine amphoteric surfactant is C8-C14 alkyl group.
6. The tight reservoir phase-permeability profile control agent and the preparation method thereof according to claim 1, wherein the nonionic surfactant is one of alkylphenol ethoxylates or fatty alcohol-polyoxyethylene ethers.
7. The tight reservoir phase-permeation profile control agent and the preparation method thereof according to claim 6, wherein the number of the oxyethylene groups of the alkylphenol ethoxylates or the fatty alcohol polyoxyethylene ether is 7-15.
8. The tight reservoir phase-permeation profile control agent and the preparation method thereof according to claim 1, wherein the auxiliary agent is monohydric aliphatic alcohol, and the aliphatic alcohol is C2-C4 aliphatic alcohol.
9. The tight reservoir phase permeability modifying and flooding agent and the preparation method thereof as claimed in claim 1, characterized in that 9.0g of dodecyl dimethyl hydroxypropyl sulfobetaine, 1.0g of super strong phase permeability modifier, 7.0g of AEO-9, 3.0g of ethanol, 0.5g of intermediate are weighed, water is added to complement 100g, and the tight reservoir phase permeability modifying and flooding agent is obtained by uniformly stirring.
10. The tight reservoir phase permeability modifying and flooding agent and the preparation method thereof as claimed in any one of claims 1 to 9, wherein 0.5-5% of the tight reservoir phase permeability modifying and flooding agent aqueous solution can be applied to oil recovery chemicals for improving recovery efficiency in the process of tight crude oil extraction.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018064A (en) * | 2015-07-01 | 2015-11-04 | 西南石油大学 | Foam oil-displacing agent for high salinity and ultra-low permeability or tight oil reservoirs |
| US20170226406A1 (en) * | 2014-08-12 | 2017-08-10 | China Petroleum & Chemical Corporation | Surfactant composition and preparation method therefor and application thereof |
| CN110527503A (en) * | 2018-05-24 | 2019-12-03 | 中国石油化工股份有限公司 | Middle and low permeable reservoir displacement of reservoir oil zwitterion is to nanoemulsions oil displacement agent |
| CN110952952A (en) * | 2019-12-18 | 2020-04-03 | 成都新驱势石油技术开发有限公司 | Low-permeability reservoir deep profile control and flooding method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170226406A1 (en) * | 2014-08-12 | 2017-08-10 | China Petroleum & Chemical Corporation | Surfactant composition and preparation method therefor and application thereof |
| CN105018064A (en) * | 2015-07-01 | 2015-11-04 | 西南石油大学 | Foam oil-displacing agent for high salinity and ultra-low permeability or tight oil reservoirs |
| CN110527503A (en) * | 2018-05-24 | 2019-12-03 | 中国石油化工股份有限公司 | Middle and low permeable reservoir displacement of reservoir oil zwitterion is to nanoemulsions oil displacement agent |
| CN110952952A (en) * | 2019-12-18 | 2020-04-03 | 成都新驱势石油技术开发有限公司 | Low-permeability reservoir deep profile control and flooding method |
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Inventor after: Wei Jiancheng Inventor after: Pei Yubin Inventor after: Zhang Pengzhi Inventor before: Wei Jiancheng Inventor before: Jiang Tao Inventor before: Zhao Wenxun Inventor before: Li Wenkun Inventor before: Pei Yubin Inventor before: Zhang Pengzhi |
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