CN111154473B - Blockage removal oil displacement agent and preparation method and application thereof - Google Patents
Blockage removal oil displacement agent and preparation method and application thereof Download PDFInfo
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- CN111154473B CN111154473B CN202010037691.8A CN202010037691A CN111154473B CN 111154473 B CN111154473 B CN 111154473B CN 202010037691 A CN202010037691 A CN 202010037691A CN 111154473 B CN111154473 B CN 111154473B
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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Abstract
The embodiment of the invention discloses a blockage removing oil displacement agent as well as a preparation method and application thereof, relating to the technical field of oil exploitation, wherein the blockage removing oil displacement agent comprises the following raw materials in percentage by weight: 15-25% of single-component surfactant, 20-30% of oil-water interface tracer and the balance of deionized water. The plugging removal oil displacement agent provided by the embodiment of the invention adopts a single-component surfactant, so that the chromatographic separation in an oil reservoir is avoided, the oil-water interface tracking agent is added into the plugging removal oil displacement agent, the oil-water separation speed of an emulsion can be improved, the oil flow is favorably and quickly gathered to form oil flow, the plugging removal and oil displacement effects are obviously improved, the plugging removal oil displacement agent is suitable for the oil reservoir with the permeability of more than 0.1mD, the temperature of less than 150 ℃ and the mineralization resistance of 250000mg/L, most oil reservoir conditions are met, and the plugging removal oil displacement agent suitable for the oil reservoir conditions can be conveniently selected according to specific oil reservoir characteristic conditions.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil exploitation, and particularly relates to a blockage removing oil displacement agent and a preparation method and application thereof.
Background
Petroleum is used as an important energy source, the demand of domestic crude oil is still increased, but the external dependency degree is close to 70%, the productivity is concentrated in some old oil fields and oil fields with poor oil reservoir physical properties, the oil fields, particularly oil reservoirs with low and medium permeability, high shale content or heavy oil, have the problems of difficult water injection and liquid production at the water injection end and the extraction end respectively in the long-term water injection development process due to the reasons of high residual oil or impurity content of injected water, oil-water emulsification, shale migration in the stratum, scaling and the like, and the problems of breakage of a water injection pipe column, pipe external channeling, premature water flooding of the oil reservoir and the like are easily caused by long-term high-pressure water injection. When the oil reservoir is short of injection for a long time, the extraction end can not be effectively supplemented or is sedimentated and blocked by mud and matrix due to stratum energy, the liquid production amount is continuously reduced, and the oil reservoir is in a liquid supply insufficient state for a long time; once the oil reservoir is flooded too early and fractured water channeling occurs, the water content of the oil well rises continuously, and the oil field production is seriously affected.
At present, the problems of difficult injection and liquid production are generally solved by adopting a fracturing and matrix acidizing technology, but the technology has the defects of short action distance of measures, easy formation of new blocking points due to the migration of part of mineral components subjected to corrosion and loosening, short effective period and even ineffective measures, or the phenomenon of extremely poor and further worsened permeability due to the non-uniform injection of acid liquor, needs frequent operation to relieve the problems of difficult injection and extraction, and has the defects of high measure cost and further influence on crude oil production. The key to solve the problems is to maintain the effective permeability of the injection end and the extraction end for a long time and improve the water and oil seepage capability.
In the prior art, multiple types of surfactants are compounded to achieve the purposes of reducing oil-water interfacial tension, emulsifying and washing oil and changing wettability, so that the water absorption capacity of an ultra-low permeability oil reservoir is improved, and a certain effect is achieved, for example, in patent CN104371689A, an ultra-low interfacial tension surfactant compounding system compounded by anionic, nonionic and amphoteric surfactants is used for pressure reduction and injection increase, but the complex system can generate obvious chromatographic separation in the oil reservoir migration process, so that the proportion of each component after the compound system is separated is unbalanced, the system performance is greatly reduced, and particularly when the complex system is used in an oil reservoir with higher calcium and magnesium ions, the anionic component in the patent is water-insoluble substance formed after the alkyl sulfonate is subjected to chromatographic separation in the stratum and is combined with the calcium and magnesium ions in the stratum, and the risk of secondary damage to the oil reservoir is easily caused. The surfactant oil-displacing system with ultralow interfacial tension generally forms an oil-in-water type emulsion with lower viscosity in the process of emulsification and oil washing, the viscosity of the emulsion is far lower than that of crude oil, and if the emulsion cannot quickly realize oil-water separation to form an oil wall, the subsequent displacement fluid is very easy to generate a channeling fingering phenomenon, so that the oil displacing effect and the utilization rate of the surfactant are reduced.
Therefore, a single-component surfactant capable of forming an oil-water interface is soughtThe tension is reduced to 10-2The low-emulsion blockage-removing oil displacement system has positive significance for improving the injection-increasing oil displacement capability of a water injection well and improving the yield of an oil well, and can ensure that one measure achieves multiple effects by the combined application of the low-emulsion blockage-removing oil displacement system and acidification and fracturing measures, and has important value for improving the acidification and fracturing measures.
Disclosure of Invention
Therefore, the embodiment of the invention provides a blockage removal oil displacement agent and a preparation method and application thereof, and aims to solve the problems that in the existing oil exploitation process, a surfactant system for blockage removal and oil displacement can generate obvious chromatographic separation and cannot realize oil-water separation quickly in the oil reservoir migration process.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to the first aspect of the embodiment of the invention, the blockage removing oil displacement agent comprises the following raw materials in percentage by weight: 15-25% of single-component surfactant, 20-30% of oil-water interface tracer and the balance of deionized water.
By adopting the technical scheme, the obtained blockage removing oil displacement agent can reduce the interfacial tension of crude oil and water to 10-2The mN/m is an order of magnitude below, the wetting angle range for changing the wettability is 30-120 degrees, the oil washing rate is more than or equal to 30 percent, the crude oil emulsification rate is less than 60 percent, and the oil-water separation time after oil-water emulsification is less than 15 minutes.
Further, the structure of the single-component surfactant is R1-(CH2CH2O)m(CH2CH2CHO)n-R2(ii) a Wherein R is1Is lipophilic radical, R2The hydrophilic group is m 0 to 10, and n 0 to 15.
According to the technical scheme, the single-component surfactant in the de-plugging oil-displacing agent has a plurality of adjustable oleophilic hydrophilic groups, and according to the temperature of a specific oil reservoir, the mineralization degree of water and the physical property of crude oil, the technical characteristic parameters of the de-plugging oil-displacing agent are achieved by optimizing the types and the unit number of the oleophilic hydrophilic groups and the number of carbon atoms of oleophilic carbon chains in the surfactant molecules and adjusting the number of polymerization units of polyoxyethylene and polyoxypropylene, so that the de-plugging oil-displacing agent with better matching property with different oil reservoir fluids is obtained.
Further, said R1Is one of C8-C24 linear chain or branched chain alkoxy, C8-C24 primary amine or tertiary amine, C8-C24 alkylamidopropylamine or C8-C24 alkylphenoxy.
Further, said R2Is one of carboxylic acid sodium salt, phosphoric acid sodium salt, sulfonic sodium salt, hydroxyethyl sulfonic sodium salt and hydroxypropyl sulfonic sodium salt.
Further, the oil-water interface tracer has strong hydrophobicity.
Through the technical scheme, the oil-water interface tracking agent is a strong lipophilic material and is insoluble in oil, follows an oil-water interface in the moving process, is insoluble in both water and oil, and accordingly collects oil drops, quickly separates oil water and plays a role in liquid flow steering in the deep part of an oil reservoir. Furthermore, the oil-water interface tracking agent is one or more of expanded graphite, flake graphite, spherical graphite, graphene, hydrophobic silica, polytetrafluoroethylene and polyurethane resin. Furthermore, the particle size of the oil-water interface tracer is 0.01-100 μm, and suitable hydrophobic particulate matters, particle sizes and use concentrations thereof can be optimized according to specific oil reservoir day drop, and the particle size is preferably 0.02-30 μm.
According to a second aspect of the embodiments of the present invention, the preparation method of the above-mentioned unblocking oil-displacing agent includes the following steps:
weighing the raw materials according to the weight percentage, adding deionized water into a reaction kettle at normal temperature and normal pressure, adding a single-component surfactant under stirring for 20-40 minutes, adding an oil-water interface tracking agent, stirring for 40-70 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent;
and (3) grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 5-60min to obtain the de-plugging oil-displacing agent.
According to the third aspect of the embodiment of the invention, the blockage removing oil displacement agent can be used for blockage removing synergistic oil displacement of a water injection well, water lock removal of the deep part of an oil reservoir, blockage removing oil displacement of an oil well and oil increasing precipitation, can be used as an acidification pad fluid or an acidification post fluid in the acidification process of an oil-water well, and can also be used as a fracturing pad fluid in the fracturing process of the oil-water well. Further, when the plugging removal oil displacement agent is used for plugging removal and synergistic oil displacement of a water injection well, a low-concentration continuous injection mode or a high-concentration intermittent periodic injection mode can be adopted.
The plugging removal oil displacement agent is added into oil field injection water, organic pollutants of oil deposit injection and production wells with various permeability rates are removed through emulsification oil washing, capillary resistance is reduced and the number of the capillaries is increased through ultralow interfacial tension and wettability change, so that the water injection capacity of the water injection well and the oil increasing and water reducing effects of the oil well are improved, the water lock effect of the deep part of the oil deposit is reduced or eliminated, the water drive wave and the volume are better expanded, the crude oil recovery rate is finally improved, the plugging removal oil displacement agent is suitable for plugging removal oil displacement of oil deposits with high, medium and low permeability of more than 0.1mD, the mineralization resistance reaches 250000mg/L, and the preferable oil deposit temperature is less than 150 ℃.
The plugging removal oil displacement agent is applied to acidizing and fracturing measures of an oil-water well, the effect and the effective period of the measures can be further improved, the plugging removal oil displacement agent can be used as a pre-positioned fluid for acidizing or fracturing when the plugging removal oil displacement agent is applied, or the plugging removal oil displacement agent is injected into a target layer of an oil reservoir after acidizing, and then the oil displacement agent is put into operation according to the construction flow of acidizing or fracturing, so that the acidizing or fracturing effect can be remarkably improved, and the effective period of acidizing or fracturing can be prolonged.
When the plugging removal oil displacement agent is independently used for plugging removal and oil displacement of a water injection well or an oil well, the plugging removal oil displacement agent is firstly diluted by clear water or oil field injection water to the mass percent concentration of not less than 0.015%, preferably the mass percent concentration of 0.1-0.3%, and the total injection amount is 0.001-1 time of the total effective pore volume of a specific oil reservoir target layer, a low-concentration continuous injection or high-concentration intermittent periodic injection mode can be adopted, and a higher concentration of 0.3-1% is preferably adopted during acidification or fracturing measures, and the mass percent concentration of 0.3-0.8% is preferably adopted.
The application method of the blockage removing oil displacement agent comprises the following steps:
when the low-concentration continuous injection mode is used for deblocking of a water injection well, a deblocking oil-displacing agent is prepared into a deblocking oil-displacing agent solution with the mass percent of 0.01-0.3% by using clean water or oil field injection water, the target water injection well is stopped, the prepared deblocking oil-displacing agent solution is continuously injected into a target oil layer by using a pump truck or a water injection pump according to the daily water injection rate of the water injection well, and when the injection pressure is reduced by about 1Mpa, the injection of the deblocking oil-displacing agent solution is stopped to recover the normal water injection of a water injection system; or directly filling the plugging removal oil displacement agent into the water injection system by using a metering pump, so that the mass percentage concentration of the plugging removal oil displacement agent in the water injection system is 0.01-0.3%, continuously injecting the plugging removal oil displacement agent until the water injection pressure is reduced by about 1Mpa, and continuously injecting the plugging removal oil displacement agent when the oil displacement effect needs to be further improved. Until the total volume of injected water added with the plugging removal oil displacement agent is 0.1-0.5% PV of the effective pore volume of the oil layer, the oil well can see obvious oil increasing and water reducing effects.
When the high-concentration intermittent periodic injection mode is used for deblocking of a water injection well, a deblocking oil-displacing agent is prepared into a deblocking oil-displacing agent solution with the mass percent of 0.3-1% by using clean water or oil field injection water, the prepared specific designed amount of the deblocking oil-displacing agent solution is continuously injected into a target oil layer by using a pump truck or a water injection pump according to the daily water injection rate of the water injection well, and normal water injection of a water injection system is recovered after the injection is finished; or the de-plugging oil displacement agent is directly filled into the water injection system by a metering pump, the mass percentage concentration of the de-plugging agent in the water injection system is 0.3-1%, the de-plugging oil displacement agent is stopped to be injected after the de-plugging oil displacement agent solution with the designed amount is filled, the normal water injection is recovered, when the oil displacement effect needs to be further improved, the higher-concentration de-plugging oil displacement agent can be alternately injected by multiple cycles and injected water intermittently, and the oil well can achieve obvious oil increasing and water reducing effects.
When the plugging-removing oil displacement agent is used for plugging-removing oil displacement of an oil well, clear water or oil field injection water is used for preparing a plugging-removing oil displacement agent solution with the mass percent concentration of 0.05-0.6%, the volume of the needed plugging-removing oil displacement agent solution is calculated according to the treatment radius of the oil well of 1-5 m and the porosity of an oil layer, the plugging-removing oil displacement agent solution is injected into the oil layer by using a pump truck or a water injection pump, the well is closed for 1-7 days, the operation is preferably carried out after 3-5 days, and an obvious oil increasing and water reducing effect can be seen.
When the plugging removal synergist is used for acidizing of a water injection well, the plugging removal synergist can be used as an acidizing prepad fluid for cleaning organic matters in pores of an oil layer, the volume of the plugging removal oil-displacing agent is 2-10 times of the acidizing amount, the using mass percentage concentration is 0.3% -1%, an acidizing measure flow is carried out after the plugging removal oil-displacing agent is injected, and water injection is directly recovered after the acidizing of the water injection well is finished. The method can also be used for acidification measures, the volume of the method is 2-10 times of the acidification amount, the use mass percentage concentration is 0.3% -1%, normal water injection is recovered after the measures are finished, and the water absorption profile is well adjusted.
When the plugging removal oil displacement agent is used for the plugging removal and efficiency improvement of oil well acidification, the plugging removal oil displacement agent is prepared into an aqueous solution with the mass percentage concentration of 0.05-0.3% by using clear water or oil field injection water to serve as an acidification preflush, the acidizing construction process is carried out after the plugging removal oil displacement agent solution is injected, normal operation is carried out after residual acid is discharged, the residual acid discharge time is greatly shortened, and the oil well after the measures has an obvious oil increasing and water reducing effect.
When the plugging removal oil displacement agent is used for water-based fracturing synergy of an oil-water well, the plugging removal oil displacement agent is prepared into a fracturing prepad fluid with the mass percentage concentration of 0.5-1%, the volume of the injected plugging removal oil displacement agent is 10-30% of the total volume of the fracturing fluid, then the fracturing measure is completed according to a normal fracturing construction flow, water lock damage to an oil layer caused by water-based fracturing is effectively prevented, and the flow-back period and the liquid discharge amount after fracturing are shortened.
The embodiment of the invention has the following advantages:
the plugging removal oil displacement agent provided by the embodiment of the invention adopts a single-component surfactant, so that the chromatographic separation in an oil reservoir is avoided, the oil-water interface tracking agent is added into the plugging removal oil displacement agent, the oil-water separation speed of an emulsion can be improved, the oil flow is favorably and quickly gathered to form oil flow, the plugging removal and oil displacement effects are obviously improved, the plugging removal oil displacement agent is suitable for the oil reservoir with the permeability of more than 0.1mD, the temperature of less than 150 ℃ and the mineralization resistance of 250000mg/L, most oil reservoir conditions are met, and the plugging removal oil displacement agent suitable for the oil reservoir conditions can be conveniently selected according to specific oil reservoir characteristic conditions.
The blockage removing oil displacement agent provided by the embodiment of the invention has multiple purposes: the blocking remover can effectively remove organic matter pollution in a water injection well and improve water injection capability; the oil enters the oil reservoir body part, so that the phenomenon of water locking and oil locking in the oil reservoir can be eliminated, and the water drive efficiency and the crude oil recovery rate are improved; organic blockage of an oil well is relieved through huffing and puff of the oil well, the wettability of a near zone of the oil well is adjusted, the oil-water interface balance of the oil well during high water content is broken, an oil flow channel is formed again, and a good oil increasing and water reducing effect is achieved; by combined application with acidification or fracturing, the effect of acidification or fracturing is further improved, the effective period of measures is prolonged, and the cost of repeated measures is also reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
FIG. 1 is a graph comparing the oil-water interfacial tension of the solution of the de-plugging oil-displacing agent with different concentrations under the reservoir conditions of example 6, provided by the experimental example of the present invention;
FIG. 2 is a graph showing the change of oil-water interface with time after 20ml of a 0.15% plugging removal oil displacement agent solution and 10ml of dehydrated crude oil are fully mixed and emulsified at 95 ℃ under the oil reservoir conditions of example 6, which is provided by the experimental example of the present invention;
FIG. 3 is a diagram illustrating the oil-water separation effect of the plugging removal oil displacement agent provided in example 8 of the present invention under oil reservoir conditions;
FIG. 4 is a diagram showing the oil-water separation effect of the plugging removal oil displacement agent provided by the comparative example 3 under the oil reservoir condition.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The blockage removing oil displacement agent comprises the following raw materials in parts by weight: 25 parts of single-component surfactant, 20 parts of oil-water interface tracer and 55 parts of deionized water.
The single-component surfactant is sodium octadecyl fatty amine polyoxypropylene polyoxyethylene ether carboxylate, and the oil-water interface tracking agent is spherical graphite with the particle size of 2 mu m.
The preparation method of the blockage removing oil displacement agent comprises the following steps:
adding 55 parts of deionized water into a reaction kettle at normal temperature and normal pressure, adding 25 parts of single-component surfactant under stirring for 30 minutes, adding 20 parts of oil-water interface tracking agent, stirring for 60 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent;
and grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 10 minutes to obtain the de-plugging oil-displacing agent.
Example 2
The blockage removing oil displacement agent comprises the following raw materials in parts by weight: 18 parts of single-component surfactant, 30 parts of oil-water interface tracer and 52 parts of deionized water.
The single-component surfactant is cetyl fatty amine polyoxypropylene ether sodium sulfonate, and the oil-water interface tracking agent is crystalline flake graphite with the particle size of 35 mu m.
The preparation method of the blockage removing oil displacement agent comprises the following steps:
adding 52 parts of deionized water into a reaction kettle at normal temperature and normal pressure, adding 18 parts of single-component surfactant under stirring, stirring for 20 minutes, adding 30 parts of oil-water interface tracking agent, stirring for 60 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent;
and grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 20 minutes to obtain the de-plugging oil-displacing agent.
Example 3
The blockage removing oil displacement agent comprises the following raw materials in parts by weight: 15 parts of single-component surfactant, 30 parts of oil-water interface tracer and 55 parts of water.
The single-component surfactant is sodium octadecyl amido polyoxyethylene ether sulfonate, and the oil-water interface tracking agent is hydrophobic SiO with the particle size of 0.3 mu m2。
The preparation method of the blockage removing oil displacement agent comprises the following steps:
adding 55 parts of deionized water into a reaction kettle at normal temperature and normal pressure, adding 15 parts of single-component surfactant under stirring for 30 minutes, adding 30 parts of oil-water interface tracking agent, stirring for 40 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent;
and grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 30 minutes to obtain the de-plugging oil-displacing agent.
Example 4
The blockage removing oil displacement agent comprises the following raw materials in parts by weight: 16 parts of single-component surfactant, 22 parts of oil-water interface tracer and 62 parts of water.
The single-component surfactant is coconut oil tertiary amine polyoxypropylene polyoxyethylene sodium sulfonate, and the oil-water interface tracking agent is hydrophobic SiO with the particle size of 3 mu m2。
The preparation method of the blockage removing oil displacement agent comprises the following steps:
adding 62 parts of deionized water into a reaction kettle at normal temperature and normal pressure, adding 16 parts of single-component surfactant under stirring, stirring for 30 minutes, adding 22 parts of oil-water interface tracking agent, stirring for 70 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent;
and grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 10 minutes to obtain the de-plugging oil-displacing agent.
Example 5
The blockage removing oil displacement agent comprises the following raw materials in parts by weight: 19 parts of single-component surfactant, 28 parts of oil-water interface tracer and 53 parts of water.
The single-component surfactant is sodium fatty alcohol polyoxypropylene polyoxyethylene carboxylate, and the oil-water interface tracking agent is 0.05 mu m graphene.
The preparation method of the blockage removing oil displacement agent comprises the following steps:
adding 53 parts of deionized water into a reaction kettle at normal temperature and normal pressure, adding 19 parts of single-component surfactant under stirring for 30 minutes, adding 28 parts of oil-water interface tracking agent, stirring for 60 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent;
and grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 20 minutes to obtain the de-plugging oil-displacing agent.
Example 6
The de-plugging oil displacement agent described in example 1 was applied to the reservoir under the following conditions: the oil reservoir is characterized by the permeability of 1.5mD, the total mineralization of 220000mg/L, the concentration of calcium and magnesium ions of 1382mg/L, the temperature of the oil reservoir of 95 ℃ and the viscosity of crude oil of the oil reservoir of 9.3mPa.s, because the water quality does not reach the standard for a long time, the oil content of injected water exceeds the standard, the injection pressure of a water injection well is 28MPa, and the daily water injection quantity is 26m3And the oil reservoir has large-area water lock flooding phenomenon corresponding to the oil well liquid production capacity of 35m3And the water content is 92 percent. The plugging removal oil displacement agent tested under the oil reservoir condition is mainly technically characterized in that: oil-water interfacial tension of 3.52 x 10-3mN/m, a wetting angle of 92.6 degrees, an oil washing rate of 32.3 percent and an oil-water separation time of less than 15 minutes.
The specific application steps of the blockage removing oil displacement agent in the embodiment 1 are as follows: injecting the stock solution of the deblocking oil-displacing agent into a high-pressure water injection pipeline by a metering pump, setting the flow of the metering pump to ensure that the mass percent concentration of the deblocking oil-displacing agent in the injected water is 0.15%, and when continuously injecting about 0.03PV, the injection pressure is reduced by 0.8MPa, then the original water injection pressure is maintained, and the water injection amount is increased to 39m3Effectively supplementing the formation energy, continuously noting that the oil displacement agent is blocked by 0.15PV, the water content of the oil well is reduced to 78.6 percent, and the cumulative oil increase is 1265m3And the flooding condition of the oil layer is obviously improved.
Example 7
The de-plugging oil displacement agent described in example 2 was applied to the reservoir under the following conditions: the oil reservoir is characterized by the permeability of 162mD, the total mineralization of 3300mg/L, wherein the concentration of calcium and magnesium ions is 131mg/L, the temperature of the oil reservoir is 119 ℃, the viscosity of crude oil of the oil reservoir is 19.7mPa.s, the mud content is 19.8%, the water quality does not reach the standard for a long time, the mud content of the oil reservoir and the oil content of high injection water exceed the standard, the injection pressure of a water injection well is 16MPa, and the daily water injection amount is 37m3The oil well contains 87.5 percent of water, and the effective period is only 22 days after acidification. The blockage removing oil displacement agent under the oil reservoir condition is mainly technically characterized in that: oil-water interfacial tension of 6.71 x 10-3mN/m, wetting angle 87.3 degrees, oil washing rate 28%, oil-water separation time 8 minutes.
The specific application steps of the blockage removing oil displacement agent in the embodiment 2 are as follows: injecting the original solution of the deblocking oil displacement agent into a high-pressure water injection pipeline by using a metering pump, setting the flow of the metering pump to ensure that the mass percent concentration of the deblocking oil displacement agent in the injected water is 0.4%, injecting about 0.02PV solution of the deblocking oil displacement agent, then recovering normal water injection, when the total injection amount reaches 0.036PV, reducing the pressure by 1.3MPa, then maintaining the original water injection pressure, and increasing the water injection amount to 89m3D, when the cumulative water injection amount is 0.04PV after the measure, the water content of the oil well is reduced to 81.3 percent, and the daily oil production is increased by 3.5m3The effective period of water injection reaches 192 days.
Example 8
The de-plugging oil displacement agent described in example 3 was applied to the reservoir under the following conditions: the reservoir is characterized by a permeability of 18.3mD and a total mineralization of 223500mg/L, wherein calciumThe magnesium ion concentration is 5382mg/L, the oil reservoir temperature is 82 ℃, the oil reservoir crude oil viscosity is 2.3mPa.s, and the oil well liquid production capacity is 28m398% of water, no obvious effect after acidification, and serious stratum depletion. The blockage removing oil displacement agent under the oil reservoir condition is mainly technically characterized in that: oil-water interfacial tension of 1.32 x 10-3mN/m, wetting angle 78.3 ℃ and oil-washing rate 37.6%, as shown in FIG. 3, the oil-water separation effect was good at 10 minutes.
The specific application steps of the blockage removing oil displacement agent in the embodiment 3 are as follows: diluting the blockage removing oil displacement agent into a blockage removing oil displacement agent solution with the mass percent of 0.3 percent by using clear water, and using a high-pressure pump truck to remove 350m of the blockage removing oil displacement agent solution3Injecting into oil well, closing well for 6 days, opening well, lowering minimum water content of oil well by 33.5%, accumulating for 178 days, accumulating for increasing oil by 653m3。
Example 9
The de-plugging oil displacement agent described in example 4 was applied to the reservoir under the following conditions: the oil reservoir is characterized by 50.1mD of permeability, 53630mg/L of total mineralization, 650mg/L of calcium and magnesium ion concentration, 92 ℃ of oil reservoir temperature, 7.3mPa.s of crude oil viscosity of the oil reservoir and 23.2% of argillaceous content. The effective period of the oil displacement agent after fracturing of the same adjacent water injection well is less than 60 days, and the oil displacement agent for removing the blockage under the oil reservoir condition has the main technical characteristics that: oil-water interfacial tension of 6.52 x 10-3mN/m, a wetting angle of 88.1 ℃ and an oil washing rate of 25.8 percent.
The specific application steps of the blockage removing oil displacement agent in the embodiment 4 are as follows: preparing 0.6 percent by mass of blockage removal oil displacement agent solution 60m by using well injection water3The plugging removal oil displacement agent solution is used as fracturing prepositive hydraulic pressure to be injected into a water injection well, then fracturing construction is carried out, after fracturing measures are finished, the effective period is accumulated for 218 days, and the water injection amount is accumulated and increased by 23100m3。
Example 10
The de-plugging oil displacement agent described in example 5 was applied to the reservoir under the following conditions: the oil reservoir is characterized by the permeability of 630mD, the total mineralization of 4560mg/L, the oil reservoir temperature of 75 ℃, the oil reservoir crude oil viscosity of 19.2mPa.s and the argillaceous content of 13.2%. The acidizing effective period of the same adjacent water injection well is less than 30 days, and the plugging removal oil displacement agent under the oil reservoir condition is mainly technically characterized by comprising the following steps: oil-water interfacial tensionIs 2.15 multiplied by 10-3mN/m, wetting angle 66.7 deg., oil washing rate 29.6%.
The specific application steps of the blockage removing oil displacement agent in the embodiment 5 are as follows: preparing a blockage removal oil displacement agent solution with the mass percent of 0.5% by using well injection water by 80m3Injecting the blockage removing oil displacement agent solution into a water injection well as an acidification front liquid, then carrying out acidification construction, accumulating the effective period for 187 days after acidification measures are finished, well adjusting the water absorption profile, and accumulating and increasing the water injection quantity by 43000m3Cumulative oil increase 790m for the corresponding oil well3。
Comparative example 1
The reservoir characteristics of comparative example 1 were the same as example 6 except that the injection pressure of the selected comparative water injection well before the de-plugging oil displacement agent de-plugging oil displacement measure was used was 16.3MPa and the daily water injection rate was 41m3Corresponding to a water content of 91.6% in the oil well. In the comparative example, sodium dodecyl fatty amine polyoxypropylene ether sulfonate and petroleum sulfonate are selected according to the weight ratio of 3: 1.6, the plugging removal oil-displacing agent has ultralow interfacial tension, good wettability and equal oil washing efficiency, and is mainly technically characterized in that: oil-water interfacial tension of 6.53X 10-3mN/m, wetting angle 89.1 deg., oil washing rate 32.3%.
The specific application procedure of this comparison 1 is the same as that of example 6, when the total injection amount reaches 0.036PV, the pressure drops by 0.3MPa, and then the original injection water pressure is maintained, and the injection amount rises to 15m3D, when the cumulative water injection amount is 0.04PV after the measure, the water content of the oil well is reduced to 89.8 percent, and the daily oil production is increased by only 0.5m on average3The effective period of water injection is only 98 days.
Comparative example 2
The reservoir of comparative example 2 was characterized as in example 8, except that the selected comparative well had a liquid production of 28m396.5% of water, and the comparative example selects the mixture of hexadecyl amido polyoxyethylene ether sodium sulfonate, dodecyl amine oxide and n-butyl alcohol according to the proportion of 2.5: 1.4: 1 mass ratio of the mixed oil displacement agent with ultralow interfacial tension, good wettability and equal oil washing efficiency is used as a blockage removing oil displacement agent, and the blockage removing oil displacement agent is mainly technically characterized by comprising the following components in percentage by mass: oil-water interface sheetForce 1.15X 10-3mN/m, wetting angle 76.1 degree, oil washing rate 39.2%.
The specific application procedure of this comparative example is as follows: diluting the blockage removing oil displacement agent into a multi-component blockage removing oil displacement agent solution with the mass percent of 0.4 percent by using clear water, and using a high-pressure pump truck to remove 350m of the blockage removing oil displacement agent solution3Injecting into oil well, closing the well for 6 days, opening the well, lowering the minimum water content of the oil well by 4.3%, accumulating effective period by 65 days, accumulating oil increment by 106m3。
Comparative example 3
The reservoir of comparative example 3 was characterized as in example 8, except that the selected comparative oil well produced 33.5m397.3% of water, the comparison example selects sodium octadecylamido polyoxyethylene ether sulfonate as the de-plugging oil-displacing agent, and does not add an oil-water interface tracer as the de-plugging oil-displacing agent of the oil well, and the de-plugging oil-displacing agent has the main technical characteristics that: oil-water interfacial tension of 1.32 x 10-3mN/m, wetting angle 78.3 ℃ and oil washing rate 37.6%, as shown in FIG. 4, no significant oil-water separation was observed for 15 minutes.
The specific application procedure of comparative example 3 is as follows: diluting the blockage removing oil displacement agent into a blockage removing oil displacement agent solution with the mass percent of 0.3 percent by using clear water, and using a high-pressure pump truck to remove 350m of the blockage removing oil displacement agent solution3Injecting into oil well, closing the well for 6 days, opening the well, reducing the minimum water content of the oil well by 13.5%, accumulating for 108 days, and accumulating for 353m oil increase3。
Examples of the experiments
The oil displacement agent for removing blockage described in the embodiment 1 is diluted into the oil displacement agent solutions with different concentrations of 0.01%, 0.30%, 0.50%, 0.80% and 1.00% by using the oil reservoir injection water of the embodiment 6, the oil-water interfacial tension of the oil displacement agent solutions with different concentrations in the embodiment 6 is respectively tested by using a TX500C rotary drop interfacial tensiometer at the temperature of 95 ℃ at 5000 r/min, and the results shown in the figure 1 show that the oil displacement agent for removing blockage can reduce the oil-water interfacial tension of crude oil and the injection water to 10 at the oil reservoir temperature when the mass percentage concentration is 0.01-1%-3mN/m and below; in addition, the concentration change of the blockage removing oil displacement agent at 0.01-1% is obtained by observationDuring chemical conversion, the wetting angle for changing the wettability of an oil-water interface is changed from 113 degrees to 67 degrees, the oil washing rate is more than or equal to 30 percent, the oil-water separation time is less than 15 minutes, as shown in fig. 2, under the simulated oil reservoir condition of example 6, 20ml of a plugging removal oil displacement agent solution with the concentration of 0.15 percent and 10ml of dehydrated crude oil are placed in a test tube with a plug, the test tube is placed in a water bath kettle with the temperature of 95 ℃ for 30 minutes at constant temperature, the test tube is vibrated for 100 times to form an oil-water emulsion, then the oil-water emulsion is placed back into the water bath kettle, the formation time of the oil-water interface of the oil-water emulsion is observed in a standing mode, the shorter the oil-water interface appears, the clearer interface is, the better is the oil-water separation effect of the emulsion is, and as can be seen from fig. 2, the oil-water of the emulsion is obviously separated at the time of 10 minutes, which shows that the plugging removal oil displacement agent has obviously excellent oil washing and quick oil-water separation effect.
The oil-water separation capability of the blocking removal oil displacement agent described in the embodiment 3 is tested under the condition of the embodiment 8, 40ml of blocking removal oil displacement agent solution with the concentration of 0.3% and 10ml of dehydrated crude oil are placed in a test tube with a plug, the test tube is placed in a water bath kettle with the temperature of 82 ℃ for 30 minutes, after oscillation is carried out for 100 times, oil-water emulsion is formed, then the test tube is placed back in the water bath kettle, standing is carried out, the formation time of an oil-water interface of the oil-water emulsion is observed, as can be seen from a graph 3, the oil and water of the emulsion are obviously separated in 10 minutes, and the blocking removal oil displacement agent has obviously excellent emulsified oil washing and rapid oil-water separation effects.
The method comprises the steps of taking octadecyl amido polyoxyethylene ether sodium sulfonate with the mass percentage concentration of 0.3% as the deblocking oil-displacing agent in the comparative example 3, testing the oil-water separation capacity of the deblocking oil-displacing agent, placing 40ml of deblocking oil-displacing agent solution with the concentration of 0.3% and 10ml of dehydrated crude oil in a test tube with a plug, placing the test tube in a water bath kettle with the temperature of 82 ℃ for 30 minutes at constant temperature, shaking for 100 times to form oil-water emulsion, then placing the oil-water emulsion back in the water bath kettle, and standing to observe the formation time of an oil-water interface of the oil-water emulsion, wherein as can be seen from figure 4, no obvious oil-water interface still appears in the emulsion in 15 minutes, which shows that the deblocking oil-displacing agent has obvious excellent emulsified oil washing effect, but the oil-water separation effect is poor.
From the experimental results of the above examples 1-10, it can be seen that the blockage removing and oil displacing agent of the present invention can effectively remove organic matter pollution in the water injection well, and improve water injection capability; the oil enters the oil reservoir body part, so that the phenomenon of water locking and oil locking in the oil reservoir can be eliminated, and the water drive efficiency and the crude oil recovery rate are improved; the organic blockage of the oil well can be effectively removed, the wettability of a near zone of the oil well can be adjusted, the oil-water interface balance of the oil well in high water content can be broken, an oil flow channel is formed again, and a good oil increasing and water reducing effect can be achieved; by combined application with acidification or fracturing, the effect of acidification or fracturing is further improved, the effective period of measures is prolonged, and the cost of repeated measures can be reduced.
The results of the examples 6 and 8 and the comparative examples 1 and 2 show that compared with the multi-component blockage removing oil displacement agent, the blockage removing oil displacement agent disclosed by the invention adopts the synergistic effect of the single-component surfactant and the oil-water interface tracking agent, can effectively remove organic pollution in a water injection well, improve the water injection capacity, more effectively remove organic blockage of the oil well, adjust the wettability of a near zone of the oil well, break the oil-water interface balance of the oil well when the water content is high, and generate better oil increasing and water reducing effects.
The results of the example 8 and the comparative example 3 show that after the oil-water interface tracer is added into the plugging removal oil displacement agent, the oil-water separation speed of the emulsion can be improved, the rapid gathering of crude oil to form oil flow is facilitated, and the plugging removal and oil displacement effects are obviously improved.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (4)
1. The blockage removing oil displacement agent is characterized by comprising the following raw materials in percentage by weight: 15-25% of single-component surfactant, 20-30% of oil-water interface tracking agent and the balance of deionized water; the structure of the single-component surfactant is R1-(CH2CH2O)m(CH2CH2CHO)n-R2(ii) a Wherein R is1Is lipophilic radical, R2The hydrophilic group is m = 0-10, n = 0-15, and m and n are not 0 at the same time; the R is1Is one of C8-C24 linear chain or branched chain alkoxy, C8-C24 primary amine or tertiary amine, C8-C24 alkylamidopropylamine or C8-C24 alkylphenoxy; the R is2Is one of carboxylic acid sodium salt, phosphoric acid sodium salt, sulfonic sodium salt, hydroxyethyl sulfonic sodium salt and hydroxypropyl sulfonic sodium salt; the oil-water interface tracer has strong hydrophobicity; the oil-water interface tracking agent is one or more of expanded graphite, crystalline flake graphite, spherical graphite, hydrophobic silicon dioxide, polytetrafluoroethylene and polyurethane resin; the particle size of the oil-water interface tracking agent is 0.01-100 mu m.
2. The preparation method of the blockage removing and oil displacing agent according to claim 1, which comprises the following steps: weighing the raw materials according to the weight percentage, adding deionized water into a reaction kettle at normal temperature and normal pressure, adding a single-component surfactant under stirring for 20-40 minutes, adding an oil-water interface tracking agent, stirring for 40-70 minutes, and discharging to obtain a crude dispersion of the unblocking oil-displacing agent; and (3) grinding the crude dispersion of the de-plugging oil-displacing agent by using a colloid mill, and homogenizing for 5-60min to obtain the de-plugging oil-displacing agent.
3. The use of the plugging removal oil displacement agent according to claim 1, wherein the plugging removal oil displacement agent is used for plugging removal synergistic oil displacement of a water injection well, water lock removal of a deep oil reservoir, plugging removal oil displacement of an oil well and oil precipitation increase, or is used as an acidizing pad fluid or an acidizing post fluid in the acidizing process of an oil-water well, or is used as a fracturing pad fluid in the fracturing process of the oil-water well.
4. The application of the blockage removing and oil displacing agent according to claim 3, wherein the blockage removing and oil displacing agent is used for blockage removing and synergistic oil displacing of a water injection well by adopting a low-concentration continuous injection mode or a high-concentration intermittent periodic injection mode.
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