CN114487267A - Experimental method for rapidly evaluating oil displacement effect of oil displacement agent - Google Patents
Experimental method for rapidly evaluating oil displacement effect of oil displacement agent Download PDFInfo
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Abstract
The invention belongs to the technical field of tertiary oil recovery, and relates to an experimental method for rapidly evaluating the oil displacement effect of an oil displacement agent. The method comprises the following steps: quartz sand selection and treatment, preparation of an oil displacement agent aqueous solution, oil sand preparation, simulated core breeding and observation and oil displacement capability evaluation. Compared with the commonly used core oil displacement physical simulation experiment, the method has the characteristics of small workload, high speed of obtaining the experimental result and high repeatability and accuracy of the experimental result, is suitable for screening all oil displacement agents and optimizing the use concentration, and is also suitable for screening the thick oil viscosity reducer and optimizing the use concentration. The invention can compare the oil displacement effects of different oil displacement agents aiming at different crude oils, preferably selects the type of the oil displacement agent, and can also compare the oil displacement effects of the same oil displacement agent under different concentrations to optimize the optimal concentration of the oil displacement agent.
Description
Technical Field
The invention belongs to the technical field of tertiary oil recovery, and relates to an experimental method for rapidly evaluating the oil displacement effect of an oil displacement agent.
Background
The basic principles of tertiary oil recovery and recovery are not limited to two, one is to enlarge the swept volume, firstly, the displacement oil-washing efficiency is improved, the enlarged swept volume depends on a high-molecular chemical agent to improve the viscosity and water-driving resistance of an aqueous solution, and the oil-washing efficiency is improved by depending on a surfactant or a similar surfactant to reduce the oil-water interfacial tension or reduce the viscosity of crude oil, and improve the mobility of the crude oil in a porous medium of an oil reservoir, so that the yield and the recovery of the crude oil are improved. The patent aims at the screening and the optimization of the use concentration of the oil displacement agent. At present, various chemical flooding or biological agents for oil displacement are very numerous, and commonly used evaluation methods are of three major types, namely, the chemical agent directly acts with crude oil, the chemical agents with different concentrations are mixed with the crude oil, and the reduction amplitude of interfacial tension and viscosity is tested, so that the oil displacement capacity of the chemical agent is determined; the second is an oil sand washing method, which is to prepare oil sand, wash the oil sand by using chemical agents with different concentrations, and determine the oil displacement capacity of the chemical agents according to the amount of crude oil after washing; and thirdly, a physical simulation experiment, namely performing an oil displacement test by using an artificial or natural rock core, using chemical agent solutions with different concentrations as the oil displacement agent, and determining the oil displacement capacity of the chemical agent according to the quantity of the enhanced recovery ratio on the basis of water displacement. The three methods have some problems, the numerical value obtained by the evaluation test of the first method only represents the chemical performance of the oil displacement agent on one hand, and has correlation with the oil displacement capacity, but cannot directly reflect the oil displacement capacity; the second method evaluates that the values obtained from the test represent only the ability of the flooding agent to release the crude oil from the rock surface; although the numerical value obtained by the evaluation test of the third method can directly reflect the oil displacement capacity of oil displacement, the numerical value of the finally obtained enhanced recovery ratio is large in error due to large errors in the processes of core preparation, saturated oil, water displacement and the like in a core physical simulation experiment, and the true performance of the oil displacement agent are difficult to distinguish. In addition, the workload of the physical simulation oil displacement test of the rock core is very large, and the result can be obtained within days or even weeks.
Aiming at a specific oil reservoir, three main factors, namely crude oil property, formation water chemical property and oil reservoir temperature, can directly influence the performance of an oil displacement agent, and when the oil displacement agent is actually applied, the oil displacement agent which is most suitable for the oil reservoir is firstly screened out in the face of a plurality of oil displacement agents (chemical agents or biological agents), and then the optimal concentration of the oil displacement agent for use is optimized.
The optimal oil displacement agent needs to have two functions, on one hand, under the action of the oil displacement agent, residual oil which cannot flow under the water displacement condition can be started to enter a mobile phase; on the other hand, due to the existence of the oil displacement agent, the wettability of the porous medium is changed, and flowing crude oil is enabled to flow more easily in the porous medium, so that the invention of a method capable of simultaneously displaying the functions of the oil displacement agent is needed.
Disclosure of Invention
The invention provides an experimental method for rapidly evaluating the oil displacement effect of an oil displacement agent aiming at the problem of large error of the oil displacement effect of the oil displacement agent evaluated by common rock core oil displacement and oil washing sand experimental methods.
In order to achieve the aim, the invention discloses an experimental method for rapidly evaluating the oil displacement effect of an oil displacement agent, which comprises the following steps:
(1) quartz sand is selected and treated, high-purity quartz sand is selected as the quartz sand, and the surface of the quartz sand is treated by using a modifier so that the hydrophilicity of the quartz sand is consistent with that of target reservoir rock.
(2) And (3) preparing an oil displacement agent aqueous solution, namely dissolving the oil displacement agent in the formation water of the target oil reservoir, and uniformly stirring to obtain the oil displacement agent aqueous solution.
(3) And (3) preparing oil sand, namely uniformly stirring crude oil and quartz sand of the target oil reservoir under a heating condition to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
(5) And (4) simulating core breeding and observation, inverting the simulated core, then putting the simulated core at the target oil reservoir temperature for breeding, and recording the final height h of the crude oil immersed in the quartz sand section.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
Aiming at a specific target oil reservoir, the oil sand is prepared by applying crude oil of the oil reservoir, the oil sand is filled in a glass test tube to be used as a lower section, white quartz sand is filled in an upper section, and an oil displacement agent aqueous solution is injected to fill the glass test tube, sealed and placed at the target oil reservoir temperature. Crude oil on the surface of the lower oil sand grain can be released under the soaking of the oil displacement agent solution, and the crude oil floats upwards under the action of buoyancy, enters the upper white quartz sand and moves upwards to the upper porous medium. Since the glass test tubes are of the same height, they have the same amount of buoyancy, which ensures the consistency of the experimental conditions. If the oil displacement agent has a wetting change effect on the upper section of quartz sand, the upward migration amplitude of floating crude oil is larger, so that the experimental method can simultaneously verify the residual oil stripping capability and the wetting change capability of a certain oil displacement agent. Because the glass test tube used in the experiment has small volume and convenient preparation, and can be simultaneously prepared in large quantities for parallel experiments. The method can be used for comparative evaluation experiments of oil displacement capacity between different oil displacement agents, the oil displacement agents are preferably selected, and comparative evaluation can also be performed on oil displacement effects of different concentrations of the same oil displacement agent, so that the use concentration of the oil displacement agent is optimized.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) compared with the commonly used core oil displacement physical simulation experiment, the method has the characteristics of small workload, high speed of obtaining the experimental result and high repeatability and accuracy of the experimental result, is suitable for screening all oil displacement agents and optimizing the use concentration, and is also suitable for screening the thick oil viscosity reducer and optimizing the use concentration.
(2) The invention can compare the oil displacement effects of different oil displacement agents aiming at different crude oils, preferably selects the type of the oil displacement agent, and can also compare the oil displacement effects of the same oil displacement agent under different concentrations to optimize the optimal concentration of the oil displacement agent.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The endpoints of the ranges disclosed in this invention and any values are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Referring to the attached drawing 1, the invention discloses an experimental method for rapidly evaluating the oil displacement effect of an oil displacement agent, which comprises the following steps:
(1) quartz sand is selected and treated, high-purity quartz sand is selected as the quartz sand, and the surface of the quartz sand is treated by using a modifier so that the hydrophilicity of the quartz sand is consistent with that of target reservoir rock.
(2) And (3) preparing an oil-displacing agent aqueous solution, namely dissolving the oil-displacing agent in the formation water of the target oil reservoir, and uniformly stirring to obtain the oil-displacing agent aqueous solution.
(3) And (3) preparing oil sand, namely uniformly stirring crude oil and quartz sand of the target oil reservoir under a heating condition to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
(5) And (4) simulating core breeding and observation, inverting the simulated core, then putting the simulated core at the target oil reservoir temperature for breeding, and recording the final height h of the crude oil immersed in the quartz sand section.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
In the present invention, preferably, the purity of the silica sand exceeds 99.0%, and the color of the silica sand is white.
Preferably, the mesh number of the quartz sand is related to the target reservoir permeability k, and the specific relationship is as follows:
①k≤50×10-3μm2the mesh number of the quartz sand is 250-300 meshes;
②50×10-3μm2＜k≤100×10-3μm2the mesh number of the quartz sand is 200-250 meshes;
③100×10-3μm2＜k≤500×10-3μm2the mesh number of the quartz sand is 150-;
④500×10-3μm2＜k≤1000×10-3μm2the mesh number of the quartz sand is 100-150 meshes;
⑤k＞1000×10-3μm2the mesh number of the quartz sand is 30-100 meshes.
Preferably, the modifier is a resin or a high polymer.
In the invention, the oil displacement agent is preferably one of a chemical agent, a biological agent and a microbial liquid.
Preferably, the oil sand is prepared by the following specific preparation method:
adding 4-8g of target crude oil of an oil reservoir into a beaker with the volume of 250ml, adding 10-20ml of petroleum ether with the boiling range of 30-60 ℃ to completely dissolve the crude oil, adding 190g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, heating and stirring in a water bath with the temperature of 80-90 ℃ for 0.5-2h, and evaporating the petroleum ether to obtain the oil sand.
In the invention, preferably, the preparation method of the simulated core comprises the following specific steps:
filling quartz sand into a glass test tube (shown in figure 1-1), oscillating and filling, filling 4/5-5/6 (shown in figure 1-2) with the height being the length of the glass test tube, and slowly dripping an oil displacement agent aqueous solution until the quartz sand is immersed in the liquid level.
Secondly, filling oil sand into the glass test tube to the test tube opening, compacting (figure 1-3), then slowly dripping the oil displacement agent aqueous solution until the liquid level overflows (figure 1-4), and covering and sealing (figure 1-5) to obtain the simulated rock core.
Preferably, the length of the glass test tube is 15-20cm, the inner diameter is 2-3cm, at least one end of the glass test tube is open, the open end can be sealed by a cover, and the glass is one of inorganic glass, organic glass and toughened glass.
In the present invention, preferably, the simulated core propagation and observation specifically includes the following steps:
the simulated core is inverted, the oil sand section is arranged at the lower end, the quartz sand section is arranged at the upper end, then the inverted glass test tube (shown in figures 1-6) is arranged at the temperature of the target oil reservoir for breeding, the height of the crude oil immersed in the quartz sand section is observed, and the final height h is recorded.
Preferably, the oil displacement capability evaluation method comprises the following specific steps:
h is less than or equal to 1/5 glass test tube length, and the oil displacement agent has weak oil displacement capability;
h is more than 1/5 and less than or equal to 2/5 glass test tube length, and the oil displacement agent has general oil displacement capability;
③ 2/5 h is less than or equal to 3/5 glass test tube length, the oil displacement agent has strong oil displacement capability;
and h is more than 3/5 glass test tube length, and the oil displacement agent has strong oil displacement capability.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
The invention will now be further described with reference to specific examples.
Example 1
MQ for a block in Shengli oil field2The oil deposit temperature is 73 ℃, the porosity is 31.2 percent, the pressure is 12.3MPa, and the average permeability is 1200 multiplied by 10-3μm2Viscosity of crude oil 1568 mPas, degree of mineralization 9680mg/L, and geological reserve of 5.3X 105t, the total moisture content of the block before the test is 98.7%, and the rock wetting angle is 32.5 °. The method for rapidly evaluating the oil displacement effect of the chemical oil displacement agent comprises the following specific steps:
(1) quartz sand is selected and treated, wherein the quartz sand is high-purity quartz sand with the purity of 99.5%, and the surface of the quartz sand is treated by using a resin modifier so that the surface of the quartz sand is consistent with the hydrophilicity of target reservoir rock (the wetting angle is 32.5 degrees).
The target reservoir permeability is 1200 multiplied by 10-3μm2The number of the quartz sand is 30-100 meshes.
(2) Preparing the aqueous solution of the chemical oil-displacing agent by dissolving the chemical oil-displacing agent in the target oil reservoir block MQ2And uniformly stirring the mixture in the formation water to obtain an oil displacement agent aqueous solution.
(3) Oil sand preparation using target reservoir block MQ2The crude oil and the quartz sand are uniformly stirred under the heating condition to obtain the oil sand.
The oil sand is prepared by the following specific preparation method:
4g of target oil reservoir MQ2Adding crude oil into a beaker with the volume of 250ml, adding 10ml of petroleum ether with the boiling range of 30 ℃ to completely dissolve the crude oil, then adding 170g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, then heating in a water bath with the temperature of 80 ℃ and stirring for 0.5h, and evaporating the petroleum ether to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
The preparation method of the simulated rock core comprises the following specific steps:
filling quartz sand into a glass test tube, oscillating and filling 4/5 with the height being the length of the glass test tube, and slowly dripping a chemical oil displacement agent aqueous solution until the quartz sand is immersed in the liquid surface.
Secondly, filling oil sand into the glass test tube to the opening of the test tube, compacting, then slowly dripping the chemical oil displacement agent aqueous solution until the liquid level overflows, and covering and sealing to obtain the simulated rock core.
The length of glass test tube is 15cm, and the internal diameter is 2cm, glass test tube one end opening, the open end can be sealed with the lid, glass is inorganic glass.
(5) And (3) simulating core breeding and observation, inverting the simulated core, then placing the simulated core at a target reservoir temperature of 73 ℃ for breeding, and recording the final height h of the crude oil immersed in the quartz sand section, wherein the final height h is 3/5 of the length of the glass test tube.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
h is 3/5 the length of the glass test tube, and the oil displacement capacity of the chemical oil displacement agent is strong.
Example 2
MQ for a block in Shengli oil field5The oil deposit temperature is 75 ℃, the porosity is 32.5 percent, the pressure is 12.5MPa, and the average permeability is 900 multiplied by 10-3μm2The crude oil viscosity is 1985 mPa.s, the mineralization degree is 11250mg/L, and the geological reserve is 5.0 x 105t, the comprehensive water content of the block before the test is 99.0 percent, and the rock wetting angle is 30.2 degrees. The method for rapidly evaluating the oil displacement effect of the chemical oil displacement agent comprises the following specific steps:
(1) quartz sand is selected and treated, wherein the quartz sand is high-purity quartz sand with the purity of 99.8%, and the surface of the quartz sand is treated by using a resin modifier so that the quartz sand is consistent with the hydrophilicity of target reservoir rock (the wetting angle is 30.2 degrees).
Target reservoir permeability of 900 x 10-3μm2The number of the quartz sand is selected to be 100-150 meshes.
(2) Preparing the aqueous solution of the chemical oil-displacing agent by dissolving the chemical oil-displacing agent in the target oil reservoir block MQ5And uniformly stirring the mixture in the formation water to obtain an oil displacement agent aqueous solution.
(3) Oil sand preparation using target reservoir block MQ5The crude oil and the quartz sand are uniformly stirred under the heating condition to obtain the oil sand.
The oil sand is prepared by the following specific preparation method:
5g of target oil reservoir MQ5Adding crude oil into a beaker with the volume of 250ml, adding 15ml of petroleum ether with the boiling range of 40 ℃ to completely dissolve the crude oil, then adding 175g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, then heating and stirring in a water bath with the temperature of 85 ℃ for 1h, and evaporating the petroleum ether to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
The preparation method of the simulated rock core comprises the following specific steps:
filling quartz sand into a glass test tube, oscillating and filling 5/6 with the height being the length of the glass test tube, and slowly dripping a chemical oil displacement agent aqueous solution until the quartz sand is immersed in the liquid surface.
Secondly, filling oil sand into the glass test tube to the opening of the test tube, compacting, then slowly dripping the chemical oil displacement agent aqueous solution until the liquid level overflows, and covering and sealing to obtain the simulated rock core.
The length of glass test tube is 16cm, and the internal diameter is 2cm, glass test tube one end opening, the open end can be sealed with the lid, glass is toughened glass.
(5) And (3) performing propagation and observation on the simulated rock core, inverting the simulated rock core, then increasing the simulated rock core at the target oil reservoir temperature of 75 ℃, and recording the final height h of the crude oil immersed in the quartz sand section, wherein the final height h is 4/5 of the length of the glass test tube.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
h is 4/5 the length of the glass test tube, and the chemical oil displacement agent has strong oil displacement capability.
Example 3
Victory oil field certain block M8The oil deposit temperature is 85 ℃, the porosity is 32.7 percent, the pressure is 13.7MPa, and the average permeability is 800 multiplied by 10-3μm2Crude oil viscosity of 2150mPa · s, degree of mineralization of 13562mg/L, geological reserve of 7.2 × 105t, the total moisture content of the block before the test is 98.0%, and the rock wetting angle is 37.2 degrees. The method for rapidly evaluating the oil displacement effect of the biological preparation oil displacement agent comprises the following specific steps:
(1) quartz sand is selected and treated, wherein the quartz sand is high-purity quartz sand with the purity of 99.8%, and the surface of the quartz sand is treated by using a high polymer modifier, so that the surface of the quartz sand is consistent with the hydrophilicity of target reservoir rock (the wetting angle is 37.2 degrees).
Target reservoir permeability of 800 x 10-3μm2The number of the quartz sand is selected to be 100-150 meshes.
(2) Preparing the aqueous solution of the biological agent oil-displacing agent, dissolving the biological agent oil-displacing agent in the target oil reservoir block M8And uniformly stirring the mixture in the formation water to obtain an oil displacement agent aqueous solution.
(3) Oil sand production using target reservoir block M8The crude oil and the quartz sand are uniformly stirred under the heating condition to obtain the oil sand.
The oil sand is prepared by the following specific preparation method:
6g of target reservoir M8Adding crude oil into a beaker with the volume of 250ml, adding 12ml of petroleum ether with the boiling range of 35 ℃ to completely dissolve the crude oil, then adding 180g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, then heating in a water bath with the temperature of 82 ℃ and stirring for 1.5h, and evaporating the petroleum ether to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
The preparation method of the simulated rock core comprises the following specific steps:
filling quartz sand into a glass test tube, oscillating and filling 4/5 with the height being the length of the glass test tube, and slowly dripping a biological agent oil displacement agent aqueous solution until the quartz sand is immersed in the liquid surface.
Secondly, filling oil sand into the glass test tube to the opening of the test tube, compacting, then slowly dripping the biological preparation oil displacement agent aqueous solution until the liquid level overflows, and covering and sealing to obtain the simulated rock core.
The length of glass test tube is 17cm, and the internal diameter is 3cm, glass test tube one end opening, the open end can be sealed with the lid, glass is organic glass.
(5) And (3) simulating core breeding and observation, inverting the simulated core, then placing the simulated core at a target reservoir temperature of 85 ℃ for breeding, and recording the final height h of the crude oil immersed in the quartz sand section, wherein the final height h is 3/5 of the length of the glass test tube.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
h is 3/5 the length of the glass test tube, and the oil displacement capacity of the chemical oil displacement agent is strong.
Example 4
Victory oil field certain block M2The oil deposit temperature is 87 ℃, the porosity is 30.3 percent, the pressure is 12.0MPa, and the average permeability is 750 multiplied by 10-3μm2Crude oil viscosity of 3153mPa s, mineralization degree of 10587mg/L, geological reserve of 7.0 x 105t, the total moisture content of the block before the test is 98.9%, and the rock wetting angle is 31.9 °. The method for rapidly evaluating the oil displacement effect of the biological preparation oil displacement agent comprises the following specific steps:
(1) quartz sand is selected and treated, wherein the quartz sand is high-purity quartz sand with the purity of 99.5%, and the surface of the quartz sand is treated by using a high polymer modifier, so that the surface of the quartz sand is consistent with the hydrophilicity of target reservoir rock (the wetting angle is 31.9 degrees).
Target reservoir permeability of 750 x 10-3μm2The number of the quartz sand is selected to be 100-150 meshes.
(2) Preparing the aqueous solution of the biological agent oil-displacing agent, dissolving the biological agent oil-displacing agent in the target oil reservoir block M2And uniformly stirring the mixture in the formation water to obtain an oil displacement agent aqueous solution.
(3) Oil sand productionUsing the target reservoir block M2The crude oil and the quartz sand are uniformly stirred under the heating condition to obtain the oil sand.
The oil sand is prepared by the following specific preparation method:
7g of target reservoir M2Adding crude oil into a beaker with the volume of 250ml, adding 15ml of petroleum ether with the boiling range of 38 ℃ to completely dissolve the crude oil, then adding 180g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, then heating and stirring in a water bath with the temperature of 87 ℃ for 1.2h, and evaporating the petroleum ether to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
The preparation method of the simulated rock core comprises the following specific steps:
filling quartz sand into a glass test tube, oscillating and filling 4/5 with the height being the length of the glass test tube, and slowly dripping a chemical oil displacement agent aqueous solution until the quartz sand is immersed in the liquid surface.
Secondly, filling oil sand into the glass test tube to the opening of the test tube, compacting, then slowly dripping the biological preparation oil displacement agent aqueous solution until the liquid level overflows, and covering and sealing to obtain the simulated rock core.
The length of glass test tube is 18cm, and the internal diameter is 3cm, glass test tube one end opening, open end available lid is sealed, glass is inorganic glass.
(5) And (3) simulating core breeding and observation, inverting the simulated core, then breeding at the target reservoir temperature of 87 ℃, and recording the final height h of the crude oil immersed in the quartz sand section, wherein the final height h is 7/10 of the length of the glass test tube.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
h is 7/10 the length of the glass test tube, and the oil displacement capability of the biological agent oil displacement agent is strong.
Example 5
Victory oil field certain block P21The oil reservoir temperature is 90 ℃, the porosity is 30.9 percent and the pressure is 12.8MPa, average permeability 500X 10-3μm2Crude oil viscosity of 1987 mPa.s, mineralization degree of 25678mg/L, and geological reserve of 9.5X 105t, the total moisture content of the block before the test is 98.3%, and the rock wetting angle is 31.0 degrees. The method for rapidly evaluating the oil displacement effect of the biological preparation oil displacement agent comprises the following specific steps:
(1) quartz sand is selected and treated, wherein the quartz sand is high-purity quartz sand with the purity of 99.2%, and the surface of the quartz sand is treated by using a high polymer modifier, so that the surface of the quartz sand is consistent with the hydrophilicity of target reservoir rock (the wetting angle is 31.0 degrees).
Target reservoir permeability of 500 x 10-3μm2The number of the quartz sand is selected to be 150-200 meshes.
(2) Preparing the aqueous solution of the biological agent oil-displacing agent, dissolving the biological agent oil-displacing agent in the target oil reservoir block P21And uniformly stirring the mixture in the formation water to obtain an oil displacement agent aqueous solution.
(3) Oil sand preparation from target reservoir block P21The crude oil and the quartz sand are uniformly stirred under the heating condition to obtain the oil sand.
The oil sand is prepared by the following specific preparation method:
mixing 8g of target reservoir P21Adding crude oil into a beaker with the volume of 250ml, adding 20ml of petroleum ether with the boiling range of 40 ℃ to completely dissolve the crude oil, then adding 190g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, then heating and stirring in a water bath with the temperature of 90 ℃ for 2 hours, and evaporating the petroleum ether to obtain the oil sand.
(4) Preparing a simulated core, filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column.
The preparation method of the simulated rock core comprises the following specific steps:
filling quartz sand into a glass test tube, oscillating and filling 4/5 with the height being the length of the glass test tube, and slowly dripping a biological preparation oil displacement agent aqueous solution until the quartz sand is immersed in the liquid surface.
Secondly, filling oil sand into the glass test tube to the opening of the test tube, compacting, then slowly dripping the biological preparation oil displacement agent aqueous solution until the liquid level overflows, and covering and sealing to obtain the simulated rock core.
The length of glass test tube is 20cm, and the internal diameter is 2cm, glass test tube one end opening, open end available lid is sealed, glass is organic glass.
(5) And (3) simulating core breeding and observation, inverting the simulated core, then placing the simulated core at the target oil reservoir temperature of 90 ℃ for breeding, and recording the final height h of the crude oil immersed in the quartz sand section, wherein the final height h is 7/10 of the length of the glass test tube.
(6) Evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
h is 7/10 the length of the glass test tube, and the oil displacement capability of the biological agent oil displacement agent is strong.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (12)
1. An experimental method for rapidly evaluating the oil displacement effect of an oil displacement agent is characterized by comprising the following steps:
(1) quartz sand is selected and treated, wherein the quartz sand is high-purity quartz sand, and the surface of the quartz sand is treated by using a modifier so that the hydrophilicity of the quartz sand is consistent with that of target reservoir rock;
(2) preparing an oil-displacing agent aqueous solution, dissolving an oil-displacing agent in the formation water of a target oil reservoir, and uniformly stirring to obtain the oil-displacing agent aqueous solution;
(3) preparing oil sand, namely uniformly stirring crude oil and quartz sand of a target oil reservoir under a heating condition to obtain the oil sand;
(4) preparing a simulated core, namely filling quartz sand and oil sand in a glass test tube in a layered manner, and adding an oil displacement agent aqueous solution to obtain a simulated sand column;
(5) simulating core breeding and observation, inverting the simulated core, then putting the simulated core at the target oil reservoir temperature for breeding, and recording the final height h of the crude oil immersed in the quartz sand section;
(6) evaluating the oil displacement capability, wherein the oil displacement capability of the oil displacement agent is related to the final height h of the crude oil immersed in the quartz sand section, and the larger the h is, the stronger the oil displacement capability is.
2. The experimental method of claim 1, wherein the purity of the quartz sand is more than 99.0%, and the color of the quartz sand is white.
3. The experimental method of claim 1, wherein the mesh number of the quartz sand is related to the target reservoir permeability k, and the specific relationship is as follows:
①k≤50×10-3μm2the mesh number of the quartz sand is 250-300 meshes;
②50×10-3μm2＜k≤100×10-3μm2the mesh number of the quartz sand is 200-250 meshes;
③100×10-3μm2＜k≤500×10-3μm2the mesh number of the quartz sand is 150-;
④500×10-3μm2＜k≤1000×10-3μm2the mesh number of the quartz sand is 100-150 meshes;
⑤k＞1000×10-3μm2the mesh number of the quartz sand is 30-100 meshes.
4. The experimental method of claim 1, wherein the modifier is a resin or a polymer.
5. The experimental method as claimed in claim 1, wherein the oil displacement agent is one of chemical agent, biological agent and microbial liquid.
6. The experimental method according to claim 1, characterized in that the oil sand is prepared by the following specific method: adding 4-8g of target crude oil of an oil reservoir into a beaker with the volume of 250ml, adding 10-20ml of petroleum ether with the boiling range of 30-60 ℃ to completely dissolve the crude oil, adding 190g of quartz sand into the beaker, uniformly stirring to fully mix the quartz sand and the crude oil, heating and stirring in a water bath with the temperature of 80-90 ℃ for 0.5-2h, and evaporating the petroleum ether to obtain the oil sand.
7. The experimental method as claimed in claim 1, wherein the preparation of the mock core is as follows:
filling quartz sand into a glass test tube, oscillating and filling 4/5-5/6 with the height being the length of the glass test tube, and slowly dripping an oil displacement agent aqueous solution until the quartz sand is immersed in the liquid level;
secondly, filling oil sand into the glass test tube to the opening of the test tube, compacting, then slowly dripping the oil displacement agent aqueous solution until the liquid level overflows, and covering and sealing to obtain the simulated rock core.
8. The assay method of claim 1, wherein the glass test tube has a length of 15 to 20cm and an inner diameter of 2 to 3 cm.
9. The assay method of claim 1, wherein the glass test tube is open at least one end, and the open end is sealed with a cap.
10. The experimental method of claim 1, wherein the glass is one of inorganic glass, organic glass and tempered glass.
11. The experimental method as claimed in claim 1, wherein the simulated core propagation and observation comprises the following steps: and (3) inverting the simulated rock core, placing the oil sand section at the lower end, placing the quartz sand section at the upper end, then placing the inverted glass test tube at the temperature of the target oil reservoir for breeding, observing the height of the crude oil immersed in the quartz sand section, and recording the final height h.
12. The experimental method of claim 1, wherein the evaluation of the oil displacement capability is carried out by the following specific method:
firstly, h is less than or equal to 1/5 glass test tubes, and the oil displacement agent has weak oil displacement capability;
h is more than 1/5 and less than or equal to 2/5 glass test tube length, and the oil displacement agent has general oil displacement capability;
③ 2/5 h is less than or equal to 3/5 glass test tube length, the oil displacement agent has strong oil displacement capability;
and h is more than 3/5 glass test tube length, and the oil displacement agent has strong oil displacement capability.
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