CN113637465B - Oil displacement method and application thereof - Google Patents
Oil displacement method and application thereof Download PDFInfo
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Abstract
The application discloses an oil displacement method and application thereof, and relates to a biological nano oil displacement and recovery efficiency improvement technology in the field of oil exploitation. The technical scheme solves the problem of 'no-injection and no-production' of low-permeability and ultra-low permeability reservoirs. The method has the characteristics of environmental protection, friendliness, efficient oil washing and the like, and can improve the sweep range and the oil displacement effect of the biological nano fluid, so that the oil field recovery rate is improved.
Description
Technical Field
The invention relates to but is not limited to the field of oil exploitation, in particular to but not limited to a biological nanometer oil displacement enhanced oil recovery technology.
Background
The recovery ratio of the offshore high and high permeability oil field reaches 50-80% after primary oil recovery, secondary oil recovery and even tertiary oil recovery, but more than 20% of crude oil is still not used. The newly added petroleum resources in China are mainly low-permeability-compact reservoir beds, about 30 percent of reservoir beds are not filled with water in water flooding, and the conventional water injection of the low-permeability reservoir beds is difficult to establish an effective displacement relation. Because the medium-low permeability reservoir has fine pores and complex structure, when fluid seeps in the medium-low permeability reservoir, the action of a phase interface is strong, and the problems of no injection and no extraction exist, the conventional enhanced recovery technology aims at solving the problem of the oil washing efficiency of a water drive channeling and a water drive accessible area, such as a polymer oil displacement technology, a multi-element composite oil displacement technology and the like, and is basically ineffective for low permeability reservoirs of which the injection is not performed and the extraction is not performed; the mature polymer flooding technology cannot be directly transplanted or popularized and applied to the medium-low permeability oil reservoirs.
The following contradictions exist in the water injection development process of medium-low permeability oil reservoir: (1) The oil layer roar structure is complex, the permeability is low, and the plane heterogeneity is strong; (2) The fluid flow has the characteristics of non-Darcy flow and is influenced by starting pressure and stress sensitive effect; (3) The injected water wave has small volume, the influence of 'water lock effect' exists, and the water drive control degree is low; (4) The water driving degree is low, the residual oil is enriched, and the recovery degree of the well group is low. The above problems seriously restrict the improvement of the water injection development effect and the reserve utilization degree of the medium-low-permeability oil reservoirs.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
The biological nanometer oil displacement system can realize oil displacement after adjustment, improves the sweep range of biological nanometer fluid, fully exerts the biological nanometer fluid oil displacement effect, can realize fixed-point and quantitative release of the biological nanometer oil displacement agent through the electric releaser, has the characteristics of environmental protection, friendliness, high-efficiency oil washing and the like, can improve the sweep range of the biological nanometer fluid, improves the oil displacement effect, and further improves the oil field recovery ratio.
The application provides an oil displacement method, which comprises the following steps: alternately injecting a liquid flow diverting agent slug and an oil displacement agent slug into a target stratum in a water injection well; then injecting water into the water injection well to drive oil;
the oil displacement agent slug comprises amphiphilic nano silicon dioxide and water.
The liquid flow diverting agent slug comprises a biosurfactant, a monomer is selected from one or more of N-dimethylacrylamide, N-diethylacrylamide and N-isopropylacrylamide polymer surfactants and water. The liquid flow diverting agent can be crosslinked under the action of stratum in-situ amphiphilic nano silicon dioxide to form temporary plugging with certain strength; the cross-linking process of the liquid flow diverting agent can be regulated by supplying a microbial nutrient source and performing biodegradation, and the degradation time can be 2 to 3 months;
in one embodiment provided herein, the concentration of the flow diversion agent in water is from 2000ppmw to 10000ppmw, and the concentration of the oil displacement agent in water is from 2000ppmw to 10000ppmw.
In one embodiment provided herein, the weight ratio of the biosurfactant to the polymeric surfactant is (25 to 40) to (60 to 75).
In one embodiment provided herein, the ratio of the number of slugs of flow diverter to displacement agent slug is (1 to 4): 1;
in one embodiment provided herein, the injection runs of the slug of flow diverter and the oil displacing agent are from 1 to 5.
In one embodiment provided herein, the sum of the injected amount of the slug of flow diverter and the slug of oil displacement agent is 100m 3 To 500m 3 ；
In one embodiment provided herein, the concentration of the flow diverter slug and the flooding slug is from 2000ppm to 10000ppm;
in one embodiment provided herein, the injection velocity of the flow diverter slug and the flooding slug is 0.1m 3 Min to 0.5m 3 /min。
In one embodiment provided herein, the water has a mineralization degree of no greater than 7500g/L.
In one embodiment provided herein, the molar ratio of the monomer N-dimethylacrylamide, the monomer N-diethylacrylamide and the monomer N-isopropylacrylamide of the polymer surfactant is (0 to 45): (0 to 30): (0 to 50), and the molar ratio of the monomers is not 0 at the same time;
in one embodiment provided herein, the polymeric surfactant has a molar ratio of monomeric N-dimethylacrylamide, monomeric N-diethylacrylamide, monomeric N-isopropylacrylamide of (20 to 45): (5 to 30): (25 to 50);
in one embodiment provided herein, the polymeric surfactant has a number average molecular weight of 287Da to 4985Da; the weight average molecular weight is about 300Da to 5000Da.
In one embodiment provided herein, the biosurfactant is selected from one or more of a lipopeptide biosurfactant broth produced by fermentation of bacillus boltzeri (Brevibacillus borstelensis), a lipopeptide biosurfactant broth produced by fermentation of Acinetobacter (Acinetobacter), a glycolipid biosurfactant broth produced by fermentation of Pseudomonas (Pseudomonas);
in one embodiment provided herein, the lipopeptide biosurfactant is present in an amount of 1g/L to 20g/L;
in one embodiment provided herein, the bacillus boltzeri is cultured for a time period ranging from 1d to 10d.
In one embodiment provided herein, the amphiphilic nanosilica is prepared from a silicon source compound selected from one or more of ethyl orthosilicate, dichlorodimethylsilane, gamma-aminopropyltrimethoxysilane, hexamethyldisilazane, N-dimethyl-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and N-dodecyltrimethoxysilane by a sol-gel method.
The preparation method of the amphiphilic nano silicon dioxide is a sol-gel method, and comprises the following steps:
adding a certain amount of deionized water into a three-neck flask of a main reactor, adding ammonia water or sodium hydroxide into the three-neck flask, adjusting the pH to be 8-11, starting a water bath for heating after the adjustment is finished, and keeping the temperature of a solution in the three-neck flask at 60 ℃ or 80 ℃; and dropwise adding a certain amount of silicon source compounds of different types into the three-neck flask through a separating funnel, and keeping stirring by a magnetic stirrer at the rotation speed of 30-50 rpm, so that the silicon source compounds start to perform hydrolysis reaction, wherein the reaction duration is 6-8 h. After the reaction is stopped, white nano SiO is obtained as a reaction product 2 And (3) gel, namely the amphiphilic nano silicon dioxide.
The amphiphilic nano silicon dioxide is apparent in a white powder state, is colorless, tasteless and pollution-free fine nonmetal particles, has a flocculent and reticular amorphous structure in a microstructure, and is low in manufacturing cost, non-toxic and harmless; flow diverter, appearance color: brown (tea) color translucent concentrated liquid, odor: fermentation odor, pH: 7.0, density: 1g/cm 3 And (3) solubility: completely water soluble, oil insoluble, boiling point: 100 ℃, salt tolerance: with any degree of mineralizationCompatibility of sewage; profile control and oil displacement slugs are alternately carried out, so that the swept range of oil displacement substances is improved, the oil displacement effect of the oil displacement substances is fully exerted, and the improvement of the oil field recovery rate is realized.
In another aspect, the application provides an application of the oil displacement method in oil displacement in medium-low permeability oil reservoirs and ultra-low permeability oil reservoirs.
In the present application, the medium-low permeability reservoir is defined as a reservoir with a permeability of between 10mD and 1000mD; in this application, the ultra-low permeability reservoir is defined as a reservoir with a permeability of less than 10mD.
Compared with the prior art, the method has the following beneficial effects:
(1) The biodegradable polyester film has good green and environment-friendly characteristics, and can be biodegraded by 100%;
(2) The sweep efficiency is improved, the self-dispersion performance of the nano oil displacement agent is good, and the sweep of the whole oil reservoir can be basically realized;
(3) The wetting inversion makes oil drops not easy to be absorbed by rocks, greatly reduces the tension of an oil-water interface, and generates a stripping force through microscopic osmotic pressure to strip residual oil from the surfaces of the rocks;
(4) In-situ bio-based high molecular substance crosslinking is carried out, so that the controllability of deep profile control is realized;
(5) The oil displacement method provided by the application has the advantages that the nano-scale spherical structure and crude oil colloid/asphaltene lamellar components are in the same geometric magnitude, and the oil penetrates into the lamellar components to break the continuous state of the lamellar components, so that crude oil is emulsified to form micro/nano-scale O/W emulsion (viscosity reduction); the nano-emulsion viscosity-reducing agent has a good nano-emulsion viscosity-reducing effect, the viscosity-reducing rate can reach more than 93%, and the interfacial tension can be greatly reduced to 0.1 to 0.5mN/m;
(6) The oil displacement agent can realize oil displacement after adjustment, improve the sweep range of oil displacement substances and fully exert the oil displacement effect of the substances; under the same conditions, simulating a hypotonic oil reservoir, the biological water solution can be increased by 13 percent more on the basis of the conventional water flooding swept volume (55.45%), and the main increment is from smaller pores.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application can be realized and attained by the invention in the aspects illustrated in the description.
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The drawings are intended to provide an understanding of the present disclosure, and are to be considered as forming a part of the specification, and are to be used together with the embodiments of the present disclosure to explain the present disclosure without limiting the present disclosure.
FIG. 1 is a schematic representation of the polymer morphology formed by the flow redirector of the present application.
FIG. 2 is a schematic illustration of the wedge coning of the oil displacing agent of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example 1
The preparation conditions of the boltztanus (Brevibacillus borstelensis) biological lipopeptide surfactant fermentation liquor are as follows: the culture conditions are as follows: KH (natural Kill) 2 PO 4 6.8g、KCl 0.5g、MgSO 4 0.5g、FeSO 4 0.14mg, mnSO 4mg, znSO 4.09 g, cuSO 4.07 g, naOH 1.4g, sodium glutamate 5.56g, sucrose 20g, dissolved in 1000ml deionized water, subpackaged in 25ml conical bottles, sealed, sterilized in autoclave for 20 minutes. Inoculating Bacillus boltzeri strain L3-2, and culturing at 37 deg.C for 5 days. After the culture is finished, the culture solution is centrifugally separated, and cells are removed to obtain the biosurfactant.
The boltzmann bacillus strain L3-2 was obtained from a laboratory isolate strain isolated from water injected into the west 8-10-1 of a major harbor oilfield well group.
The preparation method of the oil displacement substance comprises the following specific steps:
(1) Preparing a liquid flow diverting agent: configuring the biosurfactant and the polymer surfactant into a flow diversion agent according to the weight ratio of 35;
in the biosurfactant, the content of the lipopeptide biosurfactant is 15g/L.
In the polymer surfactant, the polymer monomers are N-dimethylacrylamide, N-diethylacrylamide and N-isopropylacrylamide, and the molar ratio of the three is 23. The polymeric surfactant has a number average molecular weight of about 3500Da and a weight average molecular weight of about 4000Da.
(2) Preparing an oil displacement agent: the oil displacement agent is amphiphilic nano silicon dioxide particles, 3-aminopropyl triethoxysilane and n-dodecyl trimethoxysilane are used as modifiers, and SiO is treated by an improved sol-gel method 2 The surface of the nano particle is modified;
adding a certain amount of deionized water into a three-neck flask of a main reactor, adding ammonia water or sodium hydroxide into the three-neck flask, adjusting the pH to be =11, starting a water bath to heat after the adjustment is finished, and keeping the temperature of a solution in the three-neck flask at 60 ℃; then, a certain amount of silicon source compound (TEOS) was added dropwise to the three-necked flask through a separatory funnel, and a magnetic stirrer was kept stirring at a rotation speed =30rpm, so that the TEOS started to perform the hydrolysis reaction, and the reaction duration was 6 hours. After the reaction is stopped, white nano SiO is obtained as a reaction product 2 And (5) gelling, namely, amphiphilic nano silicon dioxide.
(3) Preparing an oil displacement substance: mixing the flow diverter with water (stirring condition 120rmp,30 min) to form a flow diverter slug, and mixing the oil displacement agent with water (stirring condition 120rmp, 30min) to form an oil displacement agent slug, wherein the water is seawater.
The experiment on the influence of different microbial culture times on the oil displacement method provided by the embodiment is as follows: the injection concentrations of the liquid flow diverting agent slug and the oil displacement slug are 4000ppmw.
Table 1: measuring the viscosity of in-situ biological nano/bio-based high molecular polymer cross-linked polymer in different culture time
The nanoparticles are produced by in-situ microorganisms, the optimal concentration of the cross-linking of the bio-based polymer is reached on day 4, the final viscosity of the cross-linking of the bio-based polymer is 500mPa.s, the on-site requirement can be met, the viscosity of the cross-linked polymer can be reduced along with the extension of the culture time, the controllability of deep profile control is realized, and the total degradation time is 2-3 months generally.
The liquid flow diverting agent and the oil displacement agent are alternately injected, so that the sweep range of the biological nano fluid can be improved, and the oil displacement effect of the biological nano fluid can be fully exerted.
The experiment on the influence of the mineralization degree on the oil displacement substance and the oil displacement method provided by the embodiment is as follows: the injection concentrations of the liquid flow diverting agent slug and the oil displacement slug are 4000ppmw. Mixing the nano dispersion liquid with simulated formation water according to different proportions, mixing the nano dispersion liquid and the simulated formation water, respectively obtaining the mineralization degrees of 0mg/L, 2500mg/L, 5000mg/L, 7500mg/L, 10000mg/L and 15000mg/L, shaking uniformly, standing, observing whether the mixed liquid has a demulsification phenomenon or not, and recording the time interval of the initial demulsification.
The simulated formation water screened out in the laboratory can keep the nano liquid dispersed and stable.
Table 2: stability under different mineralization conditions
Example 2
This example only differs from example 1 in that:
a. the temperature of the silicon dioxide modifier is kept at 90 ℃ for modification; b. the content of the lipopeptide biosurfactant is 18g/L; c. the weight ratio of the biological fermentation liquid to the polymer surfactant is 29; d. the molar ratio of the polymerized monomers of the polymer surfactant is 20.
Application example 1
The W2 well is a water injection well of a 3-well area of a deep sand river street group of a W oil field.
Production horizon: e2s3U IV + V and E2s3M I up + I down + II oil group, and the vertical thickness of the water injection layer is 24M, and the oil injection layer is divided into 4 sand prevention sections. The middle part of the oil layer is 2617.65m in vertical depth.
The well completion depth of the W2 well is 2894m, the vertical depth of the completed well is 2844.63m, the oil offset is 19.55m, the maximum well deviation is 15.72 degrees, and the well completion depth is 2569.58m and the vertical depth is 2504.01 m. The well completion mode is casing perforation and non-sand control well completion.
This well group production suffers from the following problems: the water does not absorb at partial layer positions, which is probably because partial small layers have poor physical properties, the contradiction between layers is prominent, the starting pressure is high, and injected water is difficult to seep in a porous medium; the water content of the 6-port oil well is changed from 27.07 percent to 90.48 percent, shown in a table 3, and the oil displacement is uneven through plane water injection; the display plane water injection displacement is uneven, the distribution of residual oil with poor physical properties at the bottom in the structure is more, the water injection plane wave sum efficiency is low, and the wave sum coefficient is small; the cumulative oil production is 3.07 x 10 4 m 3 To 13.62X 10 4 m 3 The production degree is changed from 13.55% to 20.66%, see table 4, the plane contradiction cloth of the well group is prominent, the periphery of the well group has different water contents, the plane residual oil reserves are more, and the potential of digging the residual oil is better. The average permeability of the reservoir was 25.5mD.
TABLE 3
TABLE 4
According to the oil-water characteristics of the oil field and the W2 well group development problem, the oil displacement method provided by the embodiment 1 is selected to improve the plane oil displacement effect of the W2 well group.
The technological parameters are as follows: the quantity ratio of the liquid flow diverting agent slug to the oil displacement agent slug is 2 3 The injection speeds of the liquid flow diverting agent slug and the oil displacement slug are all 0.3m 3 /min。
The preparation can take effect after being injected for 40 days, and oil is added by 2.1 × 10 in the effective period 4 m 3 。
Application example 2:
the J oil field is positioned in a Bohai sea area, 10 oil field polymer injection wells and 28 effective wells of the oil field are centralized on a W platform, oil groups I, II, III and V are injected at polymer injection layers, and the polymer injection wells have the following problems:
the injection pressure of the water injection well is high: the injection pressure is up to 13.4MPa, the average injection pressure is 12.3MPa, and the ratio is 69%. The injection pressure is higher overall, and the injection pressure is higher than the average pressure for a total of 9 wells and 2 wells under injection.
Entering a high water content development stage: the average water content was 92.11%. The 28 oil wells are opened at 24 mouths, and the water content is less than 80%, two are below 90%, 11 are between 90% and 95%, and 9 are above 95%. The average permeability of the reservoir was 39.1mD.
The oil well industrial capacity on the plane is uneven, and the plane contradiction is prominent: average liquid production of 28 oil wells is 235m 3 D, average oil production 158m 3 And/d, below the well 13 for average production and below the well 16 for average production.
The water absorption/liquid production capacity in the longitudinal direction is uneven, and the contradiction between layers is prominent: the liquid production profile test shows that the relative liquid production ratio of the I oil group is 40.27%, the II oil group is 51.56%, the III oil group is 6.07% and the V oil group is 2.06%.
Clogging problems caused by long-term injection of polymers: on a certain day, the W5-6 well is seriously changed due to the loss of the pipe column, and the suspected polymer blockage is attached to the outer wall of the oil pipe.
The C05 wells all found problems with polymer plugging during the pumping inspection of the wells in the year.
E4-5 wells examined the pump suction at some month for a large amount of polymer and sand mixture.
According to the oil-water characteristics of the oil field and the development problem of the J oil field, the oil displacement substance and the method provided by the embodiment 2 are selected to improve the planar oil displacement effect of the J oil field.
The technological parameters are as follows: the quantity ratio of the liquid flow diverting agent slug to the oil displacement agent slug is 3 3 The injection speeds of the liquid flow diverting agent slug and the oil displacement slug are all 0.4m 3 /min。
ThroughThe preparation takes effect after 45 days of injection, and oil is added by 9.2 × 10 within the effective period 4 m 3 。
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (9)
1. A method for displacing oil comprises the following steps: alternately injecting a liquid flow diverting agent slug and an oil displacement agent slug into a target stratum in a water injection well; then injecting water into the water injection well to drive oil;
the oil displacement agent slug comprises amphiphilic nano silicon dioxide and water,
the liquid flow diverting agent slug comprises a biosurfactant, a monomer is selected from one or more of polymer surfactants of N-dimethylacrylamide, N-diethylacrylamide and N-isopropylacrylamide and water;
the concentration of the flow diversion agent in water is 2000ppmw to 10000ppmw, and the concentration of the oil displacement agent in water is 2000ppmw to 10000ppmw;
the weight ratio of the biosurfactant to the polymeric surfactant is (25 to 40) to (60 to 75);
the quantity ratio of the liquid flow diverting agent slug to the oil displacing agent slug is (1-4) to 1;
the number average molecular weight of the polymeric surfactant is 287Da to 4985Da; the weight average molecular weight is 300Da to 5000Da;
the biosurfactant is selected from lipopeptide biosurfactant fermentation liquor produced by fermenting Bacillus boltzicus;
the content of the lipopeptide biosurfactant is 1g/L to 20g/L;
the amphiphilic nano-silica is prepared from a silicon source compound by a sol-gel method, wherein the silicon source compound is one or more than two of ethyl orthosilicate, dichlorodimethylsilane, gamma-aminopropyltrimethoxysilane, hexamethyldisilazane, N-dimethyl-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and N-dodecyl trimethoxysilane.
2. The flooding method of claim 1, wherein the injection round of the flow diverter slug and the oil displacing agent is from 1 to 5.
3. The flooding method of claim 1 wherein the sum of the injection amount of the slug of flow diverter and the slug of oil displacement agent is 100m 3 To 500m 3 。
4. The flooding method of claim 3, wherein the flow diverter slug and the flooding slug are injected at a velocity of 0.1m 3 Min to 0.5m 3 /min。
5. The flooding method of any one of claims 1 to 4, wherein the degree of mineralization of the water is no greater than 7500g/L.
6. The flooding method of any one of claims 1 to 4, wherein the polymeric surfactant has a molar ratio of monomeric N-dimethylacrylamide, monomeric N-diethylacrylamide and monomeric N-isopropylacrylamide of (0 to 45) to (0 to 30) to (0 to 50), and the molar ratio of the monomers does not take 0 at the same time.
7. The oil displacement method of any one of claims 1 to 4, wherein the molar ratio of monomeric N-dimethylacrylamide, monomeric N-diethylacrylamide, monomeric N-isopropylacrylamide of the polymeric surfactant is (20 to 45): (5 to 30): (25 to 50).
8. The flooding method of claim 1, wherein the culture time of the bacillus boltzeri is 1d to 10d.
9. Use of the flooding method of any one of claims 1 to 8 for flooding medium-low permeability reservoirs, ultra-low permeability reservoirs.
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| RU2060373C1 (en) * | 1992-09-14 | 1996-05-20 | Научно-исследовательский институт "Нефтеотдача" | Method for developing oil deposit |
| WO2019055000A1 (en) * | 2017-09-13 | 2019-03-21 | Halliburton Energy Services, Inc. | Method of improving conformance applications |
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