CN109762548B - Pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant and used for low-permeability oil field - Google Patents
Pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant and used for low-permeability oil field Download PDFInfo
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- Colloid Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention discloses a gemini surfactant-containing pressure-reducing and injection-increasing oil displacement agent for a low-permeability oil field, which comprises the following raw materials: gemini type organic silicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent, biological acid, scale inhibitor and water; the invention has the beneficial effects that: the invention relates to a pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant for a low-permeability oil field, which can effectively prevent the damage to a reservoir layer due to incompatibility of formation water and stored rock after the pressure-reducing and injection-increasing oil displacement agent is injected; the pressure-reducing injection-increasing oil displacement agent can effectively prevent metal ion precipitation from damaging the stratum; the oil-water well flooding agent has the advantages of strong capability of reducing the tension of an oil-water interface, strong wettability and dispersibility and high oil washing efficiency, well solves the problems of slow diffusion of the capability of a water injection well and low oil production of an oil well, can play roles in reducing water injection pressure and increasing water injection rate, and has important significance in promoting oil reservoir flooding development and improving recovery ratio.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a pressure-reducing and injection-increasing oil displacement agent containing a gemini surfactant and used for a low-permeability oil field.
Background
Along with the increasing of energy demand, the crude oil reserves are continuously reduced, the development position of a low-permeability oil reservoir is more and more prominent, the low-permeability oil reservoir generally has the characteristics of high initial-stage yield and fast late-stage decrement due to poor reservoir physical properties, the conditions of 'no injection' and 'no extraction' are always shown in the development process, the effects of conventional production increasing and injection increasing measures are poor, and due to the serious shortage of stratum energy, most blocks are in the development stages of low oil extraction speed, low extraction degree and medium and low water content, so that the difficulty in energy supplement severely restricts the effective development of a low-permeability oil field.
According to the condition of ultra-low permeability reservoir in China, the following damages exist: water sensitivity damage, wherein the mineralization degree of injected water is lower than that of stratum water, and when chemical components are incompatible with clay minerals in a reservoir, the clay minerals are caused to be hydrated, expanded and dispersed, so that the permeability of the reservoir is reduced, and the water sensitivity damage is formed; solid phase blockage is realized, and the solid phase particles are derived from two sources, namely, a large amount of tiny particles exist in a reservoir, and the particles can move along with the flowing of the formation fluid; and secondly, foreign solid-phase particles, namely particles entering the stratum in the drilling and completion process, namely particles in the stratum or foreign solid-phase particles, can block the throat of the reservoir, so that the effective permeability is reduced. The scale formation is that when reservoir fluid and external fluid are incompatible, organic matter precipitate or inorganic matter precipitate is produced, and these precipitates are adsorbed on the surface of rock to form scale, reduce pore channel or block flow channel with liquid flow migration, so that the reservoir can be seriously damaged, and the common precipitates include calcium carbonate, barium sulfate, ferric hydroxide and calcium sulfate, and in addition, the ultra-low permeability oil reservoir is compact in lithology and low in permeability, and the interface action further increases the seepage resistance of oil and water.
In contrast, in domestic oil fields, a chemical system is mostly added into injected water to improve the water flooding effect, but because many factors influence the water flooding development effect, the performance of the currently used chemical system is single, and the satisfactory effect cannot be achieved, so that the development of the pressure-reducing and injection-increasing oil displacement agent for the low-permeability oil field is necessary.
Disclosure of Invention
The invention aims to provide a pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant for a low-permeability oil field.
The technical scheme of the invention is as follows:
a pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant for low-permeability oil fields comprises the following raw materials: gemini type organic silicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent, biological acid, scale inhibitor and water.
Further, the pressure-reducing and injection-increasing oil displacement agent for the low-permeability oil field containing the gemini surfactant comprises, by weight, 30-50 parts of the gemini organosilicon surfactant, 20-40 parts of polyoxyethylene sorbitan monooleate, 2-4 parts of a chelating agent, 30-60 parts of biological acid, 1-5 parts of a scale inhibitor and 1000 parts of water.
Furthermore, the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oilfield comprises the following raw materials, by weight, 40 parts of the gemini organosilicon surfactant, 30 parts of polyoxyethylene sorbitan monooleate, 3 parts of a chelating agent, 45 parts of a biological acid, 3 parts of a scale inhibitor and 800 parts of water.
The gemini silicone surfactant is a novel surfactant, has the performance characteristics of both the gemini surfactant and the organosilicon surfactant, overcomes the defect of poor hydrolysis resistance of the organosilicon surface after passing through the interplanetary, and has higher surface activity, lower critical micelle concentration and excellent wettability.
Polyoxyethylene sorbitan monooleate, polysorbate-80 for short, is easily soluble in ethanol, vegetable oil, ethyl acetate and methanol, and is a nonionic hydrophilic surfactant.
Chelating agent, in the course of chemical industry and industrial production adding chelating agent to make metal ion produce chelate with completely different properties, is a main method for reducing and controlling metal ion concentration, and can effectively inhibit the catalytic decomposition of metal ion to hydrogen peroxide and hypochlorous acid bleaching agent, raise bleaching efficiency, save bleaching liquor, and can effectively prevent the metal ions of calcium and magnesium from producing chemical reaction to form precipitate so as to prevent the scaling of system equipment and pipeline and can gradually remove the original scaling of system.
The scale inhibitor is a medicament which has the functions of dispersing the insoluble inorganic salt in water, preventing or interfering the precipitation and scaling of the insoluble inorganic salt on the metal surface and can maintain good heat transfer effect of metal equipment.
Further, the chelating agent is methacryloyl ethyl betaine or citric acid.
Further, the biological acid is phytic acid.
Further, the scale inhibitor is polymethacrylic acid or polyacrylic acid.
Further, the Gemini type organosilicon surfactant is trimethoxy silicon-based Gemini type organosilicon surfactant, glucose amide organosilicon Gemini surfactant, quaternary ammonium salt Gemini type organosilicon surfactant.
The preparation method of the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field comprises the following steps:
(1) adding a Gemini organic silicon surfactant, polyoxyethylene sorbitan monooleate, a chelating agent and biological acid into water, and mixing and stirring uniformly under a heating condition to obtain a mixed solution;
(2) and adding the scale inhibitor into the mixed solution, and uniformly mixing and stirring under the heating condition to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
Further, in the step (1) and the step (2), the stirring is as follows: stirring for 30-60 min at a stirring speed of 50-100 r/min.
Further, in the step (1) and the step (2), the heating temperature is 30-40 ℃.
The invention has the beneficial effects that: the invention relates to a pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant for a low-permeability oil field, which can effectively prevent the damage to a reservoir layer due to incompatibility of formation water and stored rock after the pressure-reducing and injection-increasing oil displacement agent is injected; the pressure-reducing injection-increasing oil displacement agent can effectively prevent metal ion precipitation from damaging the stratum; the oil-water well flooding agent has the advantages of strong capability of reducing the tension of an oil-water interface, strong wettability and dispersibility and high oil washing efficiency, well solves the problems of slow diffusion of the capability of a water injection well and low oil production of an oil well, can play roles in reducing water injection pressure and increasing water injection rate, and has important significance in promoting oil reservoir flooding development and improving recovery ratio.
Detailed Description
Example one
A pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant for low-permeability oil fields comprises the following raw materials: gemini type organic silicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent, biological acid, scale inhibitor and water.
The preparation method comprises the following steps:
(1) adding a Gemini organic silicon surfactant, polyoxyethylene sorbitan monooleate, a chelating agent and biological acid into water, and mixing and stirring uniformly under a heating condition to obtain a mixed solution;
(2) and adding the scale inhibitor into the mixed solution, and uniformly mixing and stirring under the heating condition to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
Example two
The pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field comprises, by weight, 30kg of trimethoxy silicon-based gemini organosilicon surfactant, 20kg of polyoxyethylene sorbitan monooleate, 2kg of methacryloyl ethyl betaine, 30kg of phytic acid, 1kg of polymethacrylic acid and 500kg of water.
The preparation method comprises the following steps:
(1) adding Gemini organosilicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent and biological acid into water, stirring at 30 deg.C and 50r/min for 30min to obtain mixed solution;
(2) adding the scale inhibitor into the mixed solution, stirring at the heating temperature of 30 ℃ at the stirring speed of 50r/min for 30min, and uniformly mixing and stirring to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
EXAMPLE III
The pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field comprises, by weight, 35kg of glucose amide organosilicon gemini surfactant, 25kg of polyoxyethylene sorbitan monooleate, 3kg of citric acid, 35kg of phytic acid, 2kg of polyacrylic acid and 600kg of water.
The preparation method comprises the following steps:
(1) adding Gemini organosilicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent and biological acid into water, stirring at 32 deg.C for 35min at 60r/min to obtain mixed solution;
(2) adding the scale inhibitor into the mixed solution, stirring at the heating temperature of 32 ℃ for 35min at the stirring speed of 60r/min, and uniformly mixing and stirring to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
Example four
The pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field comprises, by weight, 40kg of quaternary ammonium salt gemini organosilicon surfactant, 30kg of polyoxyethylene sorbitan monooleate, 3kg of citric acid, 40kg of phytic acid, 3kg of polyacrylic acid and 700kg of water.
The preparation method comprises the following steps:
(1) adding Gemini organosilicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent and biological acid into water, stirring at 34 deg.C and 80r/min for 45min to obtain mixed solution;
(2) adding the scale inhibitor into the mixed solution, stirring for 45min at the stirring speed of 80r/min under the condition that the heating temperature is 34 ℃, and uniformly mixing and stirring to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
EXAMPLE five
45kg of glucose amide organosilicon gemini surfactant, 35kg of polyoxyethylene sorbitan monooleate, 3kg of citric acid, 55kg of phytic acid, 4kg of polymethacrylic acid and 900kg of water.
The preparation method comprises the following steps:
(1) adding Gemini organosilicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent and biological acid into water, stirring at a heating temperature of 36 deg.C at a stirring speed of 90r/min for 55min, and mixing to obtain mixed solution;
(2) adding the scale inhibitor into the mixed solution, stirring at the heating temperature of 36 ℃ for 55min at a stirring speed of 90r/min, and uniformly mixing and stirring to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
EXAMPLE six
50kg of glucose amide organosilicon gemini surfactant, 40kg of polyoxyethylene sorbitan monooleate, 4kg of methacryloyl ethyl betaine, 60kg of phytic acid, 5kg of polyacrylic acid and 1000kg of water.
The preparation method comprises the following steps:
(1) adding Gemini organosilicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent and biological acid into water, stirring at a stirring speed of 100r/min at a heating temperature of 40 deg.C for 60min, and mixing to obtain mixed solution;
(2) adding the scale inhibitor into the mixed solution, stirring at the heating temperature of 40 ℃ for 60min at the stirring speed of 100r/min, and uniformly mixing and stirring to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
Comparative example 1
Oil displacing agent 1: comprises the following raw materials in parts by weight: 25kg of polyoxyethylene sorbitan monooleate, 3kg of citric acid, 35kg of phytic acid, 2kg of polyacrylic acid and 600kg of water.
The preparation method comprises the following steps:
(1) adding polyoxyethylene sorbitan monooleate, a chelating agent and biological acid into water, stirring at a stirring speed of 60r/min at a heating temperature of 32 ℃ for 35min, and uniformly mixing to obtain a mixed solution;
(2) adding the scale inhibitor into the mixed solution, and stirring at the heating temperature of 32 ℃ for 35min at the stirring speed of 60r/min to uniformly stir, thereby obtaining the oil displacement agent 1.
Comparative example 2
The oil displacement agent 2 comprises the following raw materials, by weight, 35kg of glucosamide organosilicon gemini surfactant, 35kg of phytic acid, 2kg of polyacrylic acid and 600kg of water.
The preparation method comprises the following steps:
(1) adding a Gemini organic silicon surfactant and a biological acid into water, stirring for 35min at a stirring speed of 60r/min under the condition that the heating temperature is 32 ℃, and uniformly mixing and stirring to obtain a mixed solution;
(2) adding the scale inhibitor into the mixed solution, and stirring at the heating temperature of 32 ℃ for 35min at the stirring speed of 60r/min to uniformly stir, thereby obtaining the oil displacement agent 2.
The pressure-reducing and injection-increasing oil displacement agent for the low-permeability oilfield containing the gemini surfactant obtained in the first to sixth examples, the oil displacement agent 1 obtained in the comparative example 1 and the oil displacement agent 2 obtained in the comparative example 2 are subjected to a pressure-reducing and injection-increasing effect test, an oil-water interfacial tension test, a wettability test and a surface tension test are carried out by a conventional test method, and the test results are shown in table 1:
TABLE 1
| Test items | Interfacial tension (mN/m) | Contact angle (°) | Surface tension (mN/m) |
| Example 1 | 2.8×10－3 | 17.6 | 19.8 |
| Example 2 | 3.0×10－3 | 17.8 | 20.1 |
| Example 3 | 2.9×10－3 | 18.0 | 19.7 |
| Example 4 | 3.1×10－3 | 17.9 | 19.5 |
| Example 5 | 3.2×10－3 | 18.2 | 19.8 |
| Example 6 | 2.9×10－3 | 18.1 | 19.6 |
| Comparative example 1 | 30.6×10－3 | 56.5 | 35.1 |
| Comparative example 2 | 45.7×10－3 | 55.3 | 34.7 |
As can be seen from table 1, the oil-displacing agent 1 described in comparative example 1 does not contain gemini silicone surfactant, the oil-displacing agent 2 described in comparative example 2 does not contain polyoxyethylene sorbitan monooleate and chelating agent, and the oil-displacing agents described in comparative example 1 and comparative example 2 are compared with the pressure-reducing and injection-increasing oil-displacing agent for low permeability oil field containing gemini surfactant according to the present invention: the capacity of the pressure-reducing and injection-increasing oil displacement agent for the low-permeability oilfield containing the gemini surfactant in reducing the oil-water interfacial tension is far better than that of the oil displacement agent in the comparative examples 1 and 2; the wetting strength is far stronger than that of the oil displacement agent in comparative example 1 and comparative example 2; and the surface tension of the oil displacement agent is far lower than that of the oil displacement agent in comparative example 1 and comparative example 2.
The present invention is not limited to the above-described preferred embodiments, and various other forms of the product can be obtained by anyone who has come within the teachings of the present invention, but any variation in the details thereof, which is the same as or similar to the present application, falls within the scope of the present invention.
Claims (9)
1. A pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant for low-permeability oil fields is characterized by comprising the following raw materials: gemini type organic silicon surfactant, polyoxyethylene sorbitan monooleate, chelating agent, biological acid, scale inhibitor and water;
the Gemini type organosilicon surfactant is trimethoxy silicon-based Gemini type organosilicon surfactant, glucose amide organosilicon Gemini surfactant, or quaternary ammonium salt Gemini type organosilicon surfactant.
2. The pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oilfield according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 30-50 parts of Gemini type organosilicon surfactant, 20-40 parts of polyoxyethylene sorbitan monooleate, 2-4 parts of chelating agent, 30-60 parts of biological acid, 1-5 parts of scale inhibitor and 1000 parts of water 500-.
3. The pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oilfield according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 40 parts of Gemini type organic silicon surfactant, 30 parts of polyoxyethylene sorbitan monooleate, 3 parts of chelating agent, 45 parts of biological acid, 3 parts of scale inhibitor and 800 parts of water.
4. The low permeability oilfield pressure-reducing and injection-increasing oil-displacing agent containing the gemini surfactant as claimed in claim 1, wherein the chelating agent is methacryloyl ethyl betaine or citric acid.
5. The gemini surfactant-containing depressurization and injection-increase oil displacement agent for the low permeability oilfield according to claim 1, wherein the biological acid is phytic acid.
6. The low-permeability oilfield depressurization and injection-increase oil displacement agent containing the gemini surfactant as claimed in claim 1, wherein the scale inhibitor is polymethacrylic acid or polyacrylic acid.
7. The method for preparing the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oilfield according to any one of claims 1 to 6, which is characterized by comprising the following steps of:
(1) adding a Gemini organic silicon surfactant, polyoxyethylene sorbitan monooleate, a chelating agent and biological acid into water, and mixing and stirring uniformly under a heating condition to obtain a mixed solution;
(2) and adding the scale inhibitor into the mixed solution, and uniformly mixing and stirring under the heating condition to obtain the pressure-reducing and injection-increasing oil displacement agent containing the gemini surfactant for the low-permeability oil field.
8. The method for preparing the pressure-reducing and injection-increasing oil displacement agent for the low-permeability oilfield containing the gemini surfactant according to claim 7, wherein in the step (1) and the step (2), the stirring is as follows: stirring for 30-60 min at a stirring speed of 50-100 r/min.
9. The method for preparing the gemini surfactant-containing oil displacement agent for the depressurization and the injection increasing of the low-permeability oilfield according to claim 7, wherein the heating temperature in the step (1) and the step (2) is 30-40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162783.6A CN109762548B (en) | 2019-03-05 | 2019-03-05 | Pressure-reducing and injection-increasing oil displacement agent containing gemini surfactant and used for low-permeability oil field |
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| CN110804425B (en) * | 2019-11-15 | 2021-11-23 | 中国石油集团渤海钻探工程有限公司 | Emulsifier for synthetic base drilling fluid and preparation method thereof |
| CN111019624A (en) * | 2019-12-23 | 2020-04-17 | 郑州洁灵科技有限公司 | Preparation and application of nano microemulsion for oil displacement |
| CN112961664A (en) * | 2021-02-24 | 2021-06-15 | 江苏四新界面剂科技有限公司 | High-efficiency oil displacement surfactant for oil field |
| CN113913174B (en) * | 2021-12-13 | 2022-03-04 | 胜利油田海发环保化工有限责任公司 | Pressure-reducing injection-increasing surfactant and preparation process thereof |
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