CN115895632A - Biological imbibition agent for low-permeability reservoir oil displacement and preparation method thereof - Google Patents
Biological imbibition agent for low-permeability reservoir oil displacement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a biological imbibition agent for low-permeability reservoir displacement of reservoir oil and a preparation method thereof, belonging to oilfield chemicals and comprising the following components in parts by weight: 50-60 parts of lipopeptide biosurfactant, 20-30 parts of nano surfactant, 15-25 parts of amphoteric surfactant and 3-5 parts of clay stabilizer. Compared with the prior art, the invention has the following positive effects: the coating has the advantages of changing the wettability of rock, lower surface tension, interface tension and stronger capillary imbibition; after high-temperature aging, the coating still has the functions of higher imbibition efficiency, surface tension reduction and interface tension reduction; the synergistic effect among the system components further improves the interfacial activity and capillary self-absorption height, particularly the interfacial activity; the components of the provided biological imbibition agent are temperature resistant, salt resistant, hydrolysis resistant, low in stratum adsorption quantity and hardly harm the stratum.
Description
Technical Field
The invention belongs to chemicals for oil fields, and particularly relates to a biological imbibition agent for low-permeability reservoir displacement of reservoir oil and a preparation method thereof.
Background
With the continuous development of oil fields, old oil fields on land have already entered the late stage of high water content. The main subject of oil and gas exploration development has gradually shifted to low permeability reservoirs. The reserves of low permeability reservoirs at home and abroad are rich, and the reserves of the low permeability reservoirs are evaluated in more than 40 countries in the world, and the result shows that the recoverable amount reaches about 483 multiplied by 10 8 Ton. The low-permeability oil-gas resource proportion in China reaches 49 percent of the total oil-gas resource amount, wherein the proven reserve volume is about 160 multiplied by 10 8 Ton. The method combines the current national situation that the low-permeability reservoir becomes a strategic crude oil resource replacement area, but has the characteristics of poor permeability condition, strong reservoir heterogeneity, poor water absorption capacity and the like, and the technical difficulty in the development of the low-permeability reservoir is great.
Spontaneous imbibition is an important mechanism for improving the recovery efficiency of low-permeability reservoirs. The imbibition is a process of spontaneously imbibing the wetting fluid into pores to expel the non-wetting fluid by means of capillary force, which is the main driving force of the imbibition process. The unconventional oil and gas reservoirs are low in porosity and permeability and large in capillary force, and the large capillary force can be used as the oil displacement power to strengthen the development effect. Therefore, the research on the imbibition under the action of capillary force has important significance on the development of low permeability reservoirs.
The low permeability reservoir brings great challenge to the injectivity of the fluid, the effectiveness of water injection is generally considered to be low, the wettability of the low permeability reservoir belongs to oleophylic to medium-grade wetting, and capillary force is resistance during water injection, so that the injectivity of the low permeability reservoir is greatly reduced. The surfactant solution (active water) can change the wettability and has the potential of improving the recovery ratio of the compact oil, but the effect of adding the surfactant is influenced by the temperature of an oil layer, the salinity of formation water, the type and the concentration of the surfactant; meanwhile, the surfactant can be adsorbed by huge rock surface, especially for stratum with high clay content, the surfactant is quickly adsorbed to reduce the concentration and greatly reduce the effect of improving the recovery efficiency, for example, chinese patent publication No. CN 112694885A discloses an imbibition system for oil field, and the imbibition recovery efficiency can only reach 15.63% at most; chinese patent publication No. CN 111732603A discloses a temperature-resistant and salt-resistant fracturing fluid imbibition agent and a preparation method and application thereof, and the maximum imbibition recovery rate can only reach 10.38 percent; on the other hand, the viscosity of water to which a surfactant is added does not change so much, and therefore, the water-oil fluidity ratio is hardly affected significantly by the active water, and the sweep efficiency is still not high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a biological imbibition agent for oil displacement of a low-permeability reservoir and a preparation method thereof, so that the problems of the prior art are solved, the biological imbibition agent can improve the wettability of a crack wall surface, reduce the oil-water interfacial tension, improve the surface of a rock stratum into hydrophilicity, increase the capillary force, promote the spontaneous imbibition, and improve the spontaneous imbibition recovery ratio of the low-permeability reservoir.
The invention relates to a biological imbibition agent for low-permeability reservoir oil displacement, which is prepared from the following components in parts by weight: 50-60 parts of lipopeptide biosurfactant, 20-30 parts of nano surfactant, 15-25 parts of amphoteric surfactant and 3-5 parts of clay stabilizer.
As a further improvement of the invention, the plugging agent also comprises 3 to 5 parts of organic plugging agent.
As a further improvement of the invention, the anti-swelling agent also comprises 3 to 10 parts.
As a further improvement of the invention, the anti-swelling agent is one or two of potassium carbonate and potassium chloride which are mixed in any proportion.
As a further improvement of the invention, the lipopeptide biosurfactant is prepared by fermenting bacillus subtilis, and the content is 3-5 g/L.
As a further improvement of the invention, the clay stabilizer is one or two of ammonium chloride and sodium chloride mixed in any proportion.
As a further improvement of the invention, the amphoteric surfactant is one or more of erucamidopropyl betaine, octadecyl hydroxypropyl sulfobetaine, cocomethyl monoethanolamine and oleic betaine which are optionally mixed.
The invention relates to a preparation method of a biological imbibition agent for oil displacement of a low-permeability reservoir, which is realized by the following steps: adding the lipopeptide biosurfactant, the nano surfactant and the amphoteric surfactant into a reaction kettle, slowly heating to 30-45 ℃, keeping the temperature, and stirring to uniformly mix; adding a clay stabilizer into the uniformly mixed surfactant solution, stirring to dissolve the clay stabilizer and uniformly mixing; and obtaining the biological imbibition agent for oil displacement of the low-permeability reservoir.
Compared with the prior art, the invention has the following positive effects:
1. the invention relates to a biological imbibition agent for low permeability reservoir oil displacement, which is prepared by compounding lipopeptide biosurfactant, a nano surfactant and an amphoteric surfactant. The nano surfactant forms a continuous adsorption layer on the surface of the oil-wet rock through chemical bond action to form a hydrophilic surface, and the wettability change capability of a system is enhanced after the nano surfactant is compounded with the lipopeptide biosurfactant. The addition of the zwitterionic surfactant improves the oil washing capability of the system. Under the combined action of the nano surfactant, the amphoteric surfactant and the lipopeptide biosurfactant, the oil-water interfacial tension can be ultralow, so that the imbibition oil displacement efficiency is enhanced, and the crude oil recovery rate is improved; the anti-swelling agent and the clay stabilizer are added in the system to prevent the quick-sensitive effect and the water-sensitive effect after the system is injected into the bottom layer; the system contains the organic blocking remover, which can remove colloid and asphaltene in the stratum, simultaneously treat the blockage caused by crude oil adsorption and emulsification in the near wellbore zone and dredge an oil flow channel.
2. The biological imbibition agent for low-permeability reservoir displacement of reservoir oil is mainly applied to low-permeability reservoirs, has the characteristics of temperature resistance and salt tolerance, has good compatibility with oil and water in application sites, does not generate precipitate, and does not cause stratum blockage.
3. The invention relates to a biological imbibition agent for low permeability reservoir oil displacement, wherein a lipopeptide biosurfactant is prepared by taking saccharides, inorganic salt and the like as raw materials and performing biological fermentation production. The lipopeptide surfactant is safe, green, environment-friendly and harmless to the stratum. Low production cost, wide raw material range and stable price. After the nano-surfactant and the amphoteric surfactant are compounded for use, the system has better anti-adsorption performance, and the cost of the surfactant is effectively reduced. Meanwhile, the production raw materials are easy to purchase, and the production and the use are harmless to the environment and personnel, thereby meeting the requirements of environmental protection.
Drawings
FIG. 1 is a graph of wetting angle measurements for oilfield injection water and simulated oil reservoirs;
FIG. 2 is a graph of wetting angle measurements for the injection system of example 1 and a simulated reservoir;
FIG. 3 is a graph of wetting angle measurements for the injection system and simulated reservoir of example 2;
FIG. 4 is a graph of wetting angle measurements for the injection system and simulated reservoir of example 3;
FIG. 5 is a graph of wetting angle measurements for the injection system of example 4 and a simulated reservoir.
Detailed Description
Example 1
The invention relates to a biological imbibition agent for low-permeability reservoir oil displacement, which comprises the following raw material components in parts by weight:
50 parts of lipopeptide biosurfactant;
20 parts of a nano surfactant;
20 parts of an amphoteric surfactant (coconut methyl monoethanolamine: oleic betaine = 1;
3 parts of an anti-swelling agent (potassium carbonate: potassium chloride = 1;
clay stabilizer 5 parts (ammonium chloride: sodium chloride = 1;
4 parts of an organic blocking remover.
Adding the lipopeptide biosurfactant, the nano surfactant and the amphoteric surfactant into a reaction kettle, slowly heating to 30-45 ℃, keeping the temperature, and stirring to uniformly mix; adding a clay stabilizer, an anti-swelling agent and an organic blocking remover into the uniformly mixed surfactant solution, stirring to dissolve the clay stabilizer, the anti-swelling agent and the organic blocking remover, and uniformly mixing; obtaining the biological imbibition agent for low permeability reservoir oil displacement;
the lipopeptide biosurfactant is prepared by fermenting bacillus subtilis, the content of the lipopeptide biosurfactant is 3-5 g/L, and the preparation method comprises the following steps:
A. inoculating slant solid bacillus subtilis strain into a shake flask for culture, inoculating 1 ring strain into every 500ml of culture medium in the shake flask, and performing shake culture at the temperature of 35 +/-2 ℃ at 120 rpm for 12-16 hours to obtain shake flask strain;
B. primary fermentation culture: transferring the shake flask strain prepared in the step A into a primary fermentation tank filled with a culture medium, wherein the volume ratio of the shake flask strain to the culture medium is 1:19 to 20, and fermenting and culturing for 10 to 14 hours under the conditions that the temperature is 35 plus or minus 2 ℃, the pH value is 6 to 7.5, the ventilation ratio is 1: 0.3 to 0.5 and the stirring speed is 100 to 150 r/min to obtain a primary fermentation strain;
C. secondary fermentation culture: b, transferring the primary fermentation strain prepared in the step B into a secondary fermentation tank filled with a culture medium, wherein the volume ratio of the primary fermentation strain to the culture medium is 1 to 10, and performing fermentation culture for 10 to 14 hours under the conditions that the temperature is 35 +/-2 ℃, the pH value is 6 to 7.5, the ventilation ratio is 1: 0.3 to 0.5 and the stirring speed is 100 to 110 r/min to obtain a secondary fermentation strain;
D. fermentation culture: c, inoculating the second-stage fermentation strain prepared in the step C into a third-stage fermentation tank filled with a culture medium, wherein the volume ratio of the second-stage fermentation strain to the culture medium is 1:10, feeding the materials when the thalli are in a fading period at the temperature of 35 +/-2 ℃, the pH value of 6-7.5, the ventilation ratio of 1: 0.3-0.5 and the stirring speed of 80-100 r/min, and carrying out fermentation culture for 24-26 hours to obtain the lipopeptide biosurfactant;
implementing a well: 6-341 well of certain oil production plant in Xinjiang oil field
The use effect is as follows: adding the obtained biological imbibition agent into oil field injection water according to the concentration of 0.1%, and reducing the interfacial tension value of the obtained solution and Xinjiang crude oil to 8.34 multiplied by 10 -3 (ii) a The wetting angle decreased from 74.791 ° to 52.612 ° (as shown in fig. 2, fig. 2 is a 3-time measurement, averaged in this example, see table 1 for details);the imbibition recovery ratio is 25.21 percent, and the Chinese patent publication number is as follows: CN202011423187 discloses an imbibition system for oil field, and the maximum imbibition recovery rate can reach 15.63%. Chinese patent publication No.: CN202010874362 discloses a temperature-resistant and salt-resistant fracturing fluid imbibition agent, and a preparation method and application thereof, wherein the maximum imbibition recovery rate can reach 10.38%, and therefore, the biological imbibition agent has a remarkable imbibition oil displacement effect under the same conditions.
Example 2
The invention relates to a biological imbibition agent for oil displacement of a low-permeability oil reservoir, which comprises the following raw material components in parts by weight:
58 parts of lipopeptide biosurfactant;
30 parts of a nano surfactant;
24 parts of an amphoteric surfactant (erucamidopropyl betaine: cocomethylmethanolamine: oleic betaine = 1;
8 parts of an anti-swelling agent (potassium chloride);
5 parts of clay stabilizer (sodium chloride);
5 parts of an organic blocking remover.
The preparation method is the same as that of example 1 under the condition of 45 ℃.
Implementing a well: s5-181 well of oil production plant in Xinjiang oil field
The use effect is as follows: adding the obtained biological imbibition agent into the oilfield injection water according to the concentration of 0.3 percent, and reducing the interfacial tension value of the obtained solution and the Xinjiang crude oil to 1.08 multiplied by 10 -3 (ii) a The wetting angle was reduced from 74.791 ° to 35.185 °; the imbibition recovery ratio is 35.52 percent, and the Chinese patent publication number is as follows: CN202011423187 discloses an imbibition system for oil field, and the maximum imbibition recovery rate can reach 15.63%. Chinese patent publication No.: CN202010874362 discloses a temperature-resistant and salt-resistant fracturing fluid imbibition agent, a preparation method and an application thereof, wherein the imbibition recovery rate can reach 10.38% at most, and therefore, the biological imbibition agent disclosed by the invention has a remarkable imbibition oil displacement effect under the same conditions.
Example 3
The invention relates to a biological imbibition agent for oil displacement of a low-permeability oil reservoir, which comprises the following raw material components in parts by weight:
50 parts of lipopeptide biosurfactant;
26 parts of a nano surfactant;
15 parts of an amphoteric surfactant (octadecyl hydroxypropyl sulfobetaine: cocomethyl monoethanolamine: oleic betaine = 1;
6 parts of an anti-swelling agent (potassium carbonate);
clay stabilizer 4 parts (sodium chloride);
4 parts of an organic blocking remover.
The preparation method is the same as that of example 1 under the condition of 45 ℃.
Implementing a well: l-3816 well of certain oil production plant in Xinjiang oil field
The use effect is as follows: adding the obtained biological imbibition agent into the oilfield injection water according to the concentration of 0.5%, and reducing the interfacial tension value of the obtained solution and Xinjiang crude oil to 5.43 multiplied by 10 -3 (ii) a The wetting angle is reduced from 74.791 degrees to 38.877 degrees; the imbibition recovery ratio is 28.21 percent, and the Chinese patent publication number is as follows: CN202011423187 discloses an imbibition system for oil field, and the maximum imbibition recovery rate can reach 15.63%. Chinese patent publication no: CN202010874362 discloses a temperature-resistant and salt-resistant fracturing fluid imbibition agent, a preparation method and an application thereof, wherein the imbibition recovery rate can reach 10.38% at most, and therefore, the biological imbibition agent disclosed by the invention has a remarkable imbibition oil displacement effect under the same conditions.
Example 4
The invention relates to a biological imbibition agent for oil displacement of a low-permeability oil reservoir, which comprises the following raw material components in parts by weight:
55 parts of lipopeptide biosurfactant;
25 parts of a nano surfactant;
14 parts of amphoteric surfactant (coconut methyl monoethanolamine);
clay stabilizer 3 parts (ammonium chloride: sodium chloride = 1;
the preparation method is the same as that of example 1 under the condition of 45 ℃.
Implementing a well: l-347 well of certain oil production plant in Xinjiang oil field
The using effect is as follows: adding the obtained biological imbibition agent into the oilfield injection water according to the concentration of 0.4%, and mixing the obtained solution with XinjiangThe interfacial tension value of the crude oil is reduced to 8.87 multiplied by 10 -3 The wetting angle is reduced from 74.791 degrees to 52.921 degrees, the imbibition recovery ratio is 24.01 percent, and the Chinese patent publication number is as follows: CN202011423187 discloses an imbibition system for oil field, and the maximum imbibition recovery rate can reach 15.63%. Chinese patent publication No.: CN202010874362 discloses a temperature-resistant and salt-resistant fracturing fluid imbibition agent, and a preparation method and application thereof, wherein the maximum imbibition recovery rate can reach 10.38%, and therefore, the biological imbibition agent has a remarkable imbibition oil displacement effect under the same conditions.
In the above examples 1 to 4, the nano surfactant used was produced by Jiangsu oil field division of petrochemical group, inc. or Jiebeton oil technology, inc. of China, and the particle size was 10 to 130 nm.
The following table shows the wetting angle measurements for the injection systems of examples 1-4 and simulated reservoirs:
table 1 examples 1-4 wetting angle measurements
Claims (8)
1. A biological imbibition agent for oil displacement of a low-permeability reservoir comprises the following components in parts by weight: 50-60 parts of lipopeptide biosurfactant, 20-30 parts of nano surfactant, 15-25 parts of amphoteric surfactant and 3-5 parts of clay stabilizer.
2. The biological imbibition agent for oil displacement of low permeability reservoir of claim 1, further comprising 3-5 parts of an organic blocking remover.
3. The biological imbibition agent for low permeability reservoir oil displacement of claim 1, characterized by further comprising 3-10 parts of an anti-swelling agent.
4. The biological imbibition agent for oil displacement of low permeability reservoir of claim 3, wherein the anti-swelling agent is one or a mixture of potassium carbonate and potassium chloride in any proportion.
5. The biological imbibition agent for low permeability reservoir oil displacement of claim 1, wherein the lipopeptide biosurfactant is prepared by fermenting bacillus subtilis, and the content is 3-5 g/L.
6. The biological imbibition agent for oil displacement of low permeability reservoir of claim 1, wherein the clay stabilizer is one or a mixture of ammonium chloride and sodium chloride in any proportion.
7. The biological imbibition agent for low permeability reservoir oil displacement as claimed in claim 1, wherein the amphoteric surfactant is one or more of erucamidopropyl betaine, octadecyl hydroxypropyl sulfobetaine, cocomethyl monoethanolamine and oleic betaine.
8. The preparation method of the biological imbibition agent for oil displacement of the low-permeability reservoir, which is disclosed by the claim 1, is realized by the following steps: adding the lipopeptide biosurfactant, the nano surfactant and the amphoteric surfactant into a reaction kettle, slowly heating to 30-45 ℃, keeping the temperature, and stirring to uniformly mix; adding a clay stabilizer into the uniformly mixed surfactant solution, stirring to dissolve the clay stabilizer and uniformly mixing; and obtaining the biological imbibition agent for oil displacement of the low-permeability reservoir.
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