CN113628690B - Binary composite system formula optimization method for oil displacement based on pore-throat radius suitability - Google Patents
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Abstract
The invention discloses a binary compound system formula optimization method for oil displacement based on pore throat radius suitability, which comprises the following steps: s1, preparing a series of polymer-surfactant/alkali binary composite system solutions with different polymer concentrations and surfactant/alkali concentrations, and measuring hydrodynamic radius R of each composite system h The method comprises the steps of carrying out a first treatment on the surface of the S2, determining hydrodynamic radius R of the step according to a bridging theory h Matched minimum pore throat radius R m And drawing a polymer concentration-surfactant concentration/alkali concentration-minimum pore throat radius chart; s3, drawing polymer concentration-surfactant concentration/alkali concentration-minimum pore throat radius graph plates for different polymers; s4, according to the pore throat radius of the target oil reservoir, comparing the polymer concentration-surfactant concentration/alkali concentration-minimum pore throat radius plate, considering the viscosity of the composite system, and preferably obtaining the polymer-surfactant/alkali composite system formula. The method can quickly and effectively realize the optimization of the optimal formulation of the surfactant/alkali and the polymer.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a formula optimization method of a polymer-surfactant or polymer-alkali binary compound system for oil displacement based on pore-throat radius suitability.
Background
The binary compound flooding is an enhanced oil recovery new technology developed in the 80 s of the 20 th century, and is an oil displacement technology formed by compounding alkali or surfactant and polymer. The types of chemical agents related to binary compound flooding are more, and according to the actual characteristics of a target oil reservoir, the corresponding chemical agents are required to be selected.
Currently, the research of binary composite systems is rapidly developed, and the swept volume is enlarged by adding a high molecular weight water-soluble polymer solution with a certain concentration to reduce the water-oil fluidity ratio based on the synergistic effect of chemical agents. The water-oil interfacial tension can be reduced by adding a certain amount of surfactant, and the oil displacement efficiency is improved; the adsorption of the chemical agent can be effectively reduced by adding a certain amount of alkali. The binary compound flooding technology has the characteristics of small consumption of surfactant, high oil displacement efficiency and the like, and can greatly reduce the consumption of the surfactant. A large number of indoor experiments and domestic and foreign mine field test effects show that the binary compound flooding recovery ratio can be improved by more than 20% on the basis of water flooding, and the technology is shown to be an important technical guarantee for realizing stable and even upper production of the old oil field developed in China.
The oil displacement effect of the composite system is greatly affected by the rock structure and the fluid property. Therefore, in designing the scheme, a composite system suitable for the formation condition is necessarily selected. In order to ensure smooth operation of the binary compound flooding and obtain reasonable economic benefit, the injectability problem of the compound system must be considered so as to avoid the situation of difficult injection and even no injection. Researches show that when the matching performance of the composite system and the oil layer condition is poor, the oil displacement efficiency can be greatly influenced, and the matching performance of the composite system and the oil layer condition mainly refers to the matching relation of the hydrodynamic radius of the system and the pore throat radius of the oil layer.
Indoor experimental research and oilfield mining practice show that when binary compound flooding is performed, a compound system matched with the oil layer condition is selected as a precondition for ensuring the success of the binary compound flooding. The stratum conditions of different oil fields are generally different, different formulas are selected according to actual conditions when binary compound oil displacement is carried out, and when the permeability of an oil layer is low, if a polymer with larger molecular weight and higher concentration is selected, the oil-water fluidity ratio can be well improved, but the stratum is seriously blocked at the same time, and the stratum is not damaged. So the selection of a proper composite system according to the actual stratum condition is the key for ensuring the smooth progress of binary composite flooding. However, in the optimization of the formulation design of a binary composite system, the method for optimizing the formulation between the surfactant/alkali and the polymer is still lack of an effective and rapid means.
At present, for the indoor test research of pore-throat radius suitability, the binary system research is less, most of the pore-throat radius suitability is limited to the situation in a unitary system (namely a single polymer flooding system), the current injection experiment step for evaluating the pore-throat radius suitability is complicated, the manpower and material resources are more, the evaluation result does not have universality, and the large-scale application of the oilfield site is inconvenient. Therefore, a formula optimization method of the polymer-surfactant and polymer-alkali binary compound system is necessary to be researched, and technical guidance is provided for the design of the binary compound system oil displacement system.
Disclosure of Invention
The invention aims to provide a binary compound system formula optimization method for oil displacement based on pore throat radius suitability.
The invention provides a binary compound system formula optimization method for oil displacement based on pore throat radius suitability, which comprises the following steps:
s1, selecting a certain polymer from a plurality of alternative polymers to prepare a series of polymer solutions with different concentrations, adding auxiliary agents with different concentrations under each polymer concentration to prepare a series of binary composite system solutions with different auxiliary agent concentrations, and respectively measuring hydrodynamic radius R of each binary composite system solution h . The auxiliary agent is alkali or surfactant.
The specific method comprises the following steps:
s11, preparing binary composite system solution by using distilled water, stirring to fully dissolve polymers, firstly measuring the initial viscosity of each binary composite system solution, then filtering by using microporous filter membranes with different apertures under constant pressure, and measuring the viscosity of filtrate;
s12, in a rectangular coordinate system, drawing a change curve of the relative viscosity of a filtrate of the composite system along with the aperture of the filter membrane by taking the aperture size of the microporous filter membrane as an abscissa and the relative viscosity of the composite system as an ordinate; composite system relative viscosity = composite system filtrate viscosity/composite system solution initial viscosity;
s13, in a change curve of the relative viscosity of the filtrate of the composite system along with the aperture of the filter membrane, an inflection point of the change curve is found by making an intersection point of tangent lines of the change curve before and after the relative viscosity changes, and the abscissa value corresponding to the inflection point is the hydrodynamic radius of the two composite systems.
S2, determining each hydrodynamic radius R in the step S1 according to the bridging theory h Matched minimum pore throat radius R m ，R m ＝R h And/0.46, drawing a polymer concentration-adjuvant concentration-minimum pore throat radius chart by taking the polymer concentration as an abscissa and the adjuvant concentration as an ordinate.
S3, selecting other types of polymers from the multiple types of alternative polymers respectively, and repeating the steps S1 and S2 to obtain polymer concentration-auxiliary agent concentration-minimum pore throat radius graphic plates of the different types of polymers.
S4, determining a corresponding polymer-auxiliary agent binary composite system in each polymer concentration-auxiliary agent concentration-minimum pore throat radius plate according to the average pore throat radius of the target oil reservoir, and determining a binary composite system with the maximum viscosity in all obtained polymer-auxiliary agent binary composite systems to obtain an optimal polymer-auxiliary agent binary composite system formula.
Preferably, in the step S1, the concentration of the polymer is in the range of 500-3000 mg/L. The concentration of the surfactant is 500-3000 mg/L. The concentration range of the alkali is 0.2% -1.2% of the mass percentage concentration.
Preferably, in the step S1, the constant pressure is 0.2MPa when the microporous membrane filtration is performed.
Preferably, in the step S1, the size of the microporous filter membrane is in the range of 0.10-3.00. Mu.m.
It is further preferred that the size of the microporous filter membrane is 0.10, 0.20, 0.30, 0.45, 0.65, 0.80, 1.00, 1.20, 1.50, 2.00, 3.00 μm.
Compared with the prior art, the invention has the following advantages:
the method disclosed by the invention relates to the selection of the proportion of a binary compound system for oil displacement under different oil reservoir conditions, and utilizes an established polymer-surfactant binary compound system or a polymer-alkali binary compound system to measure and draw a polymer concentration-surfactant concentration-minimum pore throat radius relation chart or a polymer concentration-alkali concentration-minimum pore throat radius relation chart.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a graph showing the relative viscosity of a complex filtrate as a function of the pore size of a filter membrane in an embodiment of the invention.
FIG. 2 is a plot of polymer concentration-surfactant concentration-minimum pore throat radius for example 1 of the present invention.
FIG. 3 is a graph of polymer concentration-sodium carbonate concentration-minimum pore throat radius for example 2 of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1
The polymers used in this example were respectively partially hydrolyzed polyacrylamides of molecular weights 700, 1000, 1500, 1900, 2300 million, and the surfactant was sodium dodecylbenzenesulfonate.
The binary composite system formula optimization method comprises the following steps:
step S1, preparing binary composite system solution with molecular weight of 700 ten thousand and concentration of 500, 1000, 1500, 2000, 2500 and 3000mg/L of partially hydrolyzed polyacrylamide and concentration of 500, 1000, 1500, 2000, 2500 and 3000mg/L of sodium dodecyl benzene sulfonate under each polymer concentrationDetermination of hydrodynamic radius R of each binary composite System h The method comprises the following specific steps:
(1) distilled water is used to prepare various binary composite system solutions, an electric stirrer is used for stirring to fully dissolve the polymer, the initial viscosity of the binary composite system solution is measured, and then microporous filter membranes with pore diameters of 0.45, 0.65, 0.80, 1.00, 1.20 and 1.50 mu m are used for filtering under constant pressure of 0.2MPa, so that the viscosity of various filtrate is measured.
(2) In a rectangular coordinate system, the pore size of the microporous filter membrane is taken as an abscissa, the relative viscosity of the composite system filtrate (namely, the viscosity of the composite system filtrate/the initial viscosity of the composite system solution) is taken as an ordinate, and a change curve of the relative viscosity of the binary composite system filtrate along with the pore size of the filter membrane is drawn, as shown in figure 1.
(3) In FIG. 1, the inflection point of the change curve is found by making the intersection point of the tangent lines of the change curve before and after the change of the relative viscosity, and the value of the abscissa corresponding to the inflection point is the hydrodynamic radius R of the composite system h 。
S2, determining hydrodynamic radius R of a series of composite systems in the step S1 according to a bridging theory h Matched minimum pore throat radius R m (R h ＝0.46R m ) And drawing a polymer concentration-surfactant concentration-minimum pore throat radius plate by taking the polymer concentration as an abscissa and the surfactant concentration as an ordinate.
And step S3, respectively adopting 1000 ten thousand, 1500 ten thousand, 1900 ten thousand and 2300 ten thousand of partially hydrolyzed polyacrylamide, and repeating the steps S1 and S2 to obtain the polymer concentration-surfactant concentration-minimum pore throat radius plate of polymers with different molecular weights.
And S4, measuring the average pore throat radius of the target oil reservoir to be 1.25 mu m, determining a corresponding polymer-surfactant binary composite system in each polymer concentration-surfactant concentration-minimum pore throat radius plate, and determining a binary composite system with the highest viscosity in all obtained polymer-surfactant binary composite systems to obtain the optimal polymer-surfactant binary composite system formula. As shown in FIG. 2, the embodiment finally determines that the binary compound system with the maximum viscosity and the molecular weight of 1500 ten thousand and the concentration of hydrolyzed polyacrylamide of 1500mg/L and sodium dodecyl benzene sulfonate of 2000mg/L is the optimized binary compound system formula for oil displacement.
Example 2
The polymer used in this example was a partially hydrolyzed polyacrylamide of molecular weights 700, 1000, 1500, 1900, 2300 ten thousand, and the base was sodium carbonate.
The binary composite system formula optimization method comprises the following steps:
step S1, preparing binary compound system solutions with the molecular weight of 700 ten thousand and the concentration of the partially hydrolyzed polyacrylamide of 500, 1000, 1500, 2000, 2500 and 3000mg/L and the concentration of sodium carbonate of 0.2, 0.4, 0.6, 0.8, 1.0 and 1.2 percent (by mass) corresponding to each polymer concentration, and determining the hydrodynamic radius R of each compound system h The method comprises the following specific steps:
(1) distilled water is used to prepare various binary composite system solutions, an electric stirrer is used for stirring to fully dissolve the polymer, the initial viscosity of the binary composite system solution is measured, and then microporous filter membranes with pore diameters of 0.45, 0.65, 0.80, 1.00, 1.20 and 1.50 mu m are used for filtering under constant pressure of 0.2MPa, so that the viscosity of various filtrate is measured.
(2) In a rectangular coordinate system, the pore size of the microporous filter membrane is taken as an abscissa, and the relative viscosity of the composite system filtrate (namely, the viscosity of the composite system filtrate/the initial viscosity of the composite system solution) is taken as an ordinate, so that a change curve of the relative viscosity of the binary composite system filtrate along with the pore size of the filter membrane is drawn.
(3) Finding out the inflection point of the change curve by making the intersection point of the tangent lines of the change curve before and after the change of the relative viscosity, wherein the value of the abscissa corresponding to the inflection point is the hydrodynamic radius R of the composite system h 。
S2, determining hydrodynamic radius R of a series of composite systems in the step S1 according to a bridging theory h Matched minimum pore throat radius R m (R h ＝0.46R m ) Sodium carbonate concentration on the abscissa of polymer concentrationOn the ordinate, polymer concentration-sodium carbonate concentration-minimum pore throat radius plate was plotted.
And step S3, respectively adopting 1000 ten thousand, 1500 ten thousand, 1900 ten thousand and 2300 ten thousand of partially hydrolyzed polyacrylamide, and repeating the steps S1 and S2 to obtain the polymer concentration-sodium carbonate concentration-minimum pore throat radius plate of polymers with different molecular weights.
And S4, measuring the average pore throat radius of the target oil reservoir to be 1.25 mu m, determining a corresponding polymer-sodium carbonate binary composite system in each polymer concentration-sodium carbonate concentration-minimum pore throat radius plate, and determining a binary composite system with the highest viscosity in all obtained polymer-sodium carbonate binary composite systems to obtain the optimal polymer-sodium carbonate binary composite system formula. As shown in FIG. 3, the embodiment finally determines that the binary compound system with the maximum viscosity and the molecular weight of 1900 ten thousand and the concentration of the partially hydrolyzed polyacrylamide of 1500mg/L and the sodium carbonate of 0.8 percent is the optimized binary compound system formula for oil displacement.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (4)
1. The formula optimization method of the binary composite system for oil displacement based on pore throat radius suitability is characterized by comprising the following steps:
s1, selecting a certain polymer from a plurality of alternative polymers to prepare a series of polymer solutions with different concentrations, adding auxiliary agents with different concentrations under each polymer concentration to prepare a series of binary composite system solutions with different auxiliary agent concentrations, and respectively measuring the hydrodynamics of each binary composite system solutionRadius R h The auxiliary agent is alkali or surfactant;
the specific method of the step is as follows:
s11, preparing binary composite system solution by using distilled water, stirring to fully dissolve polymers, firstly measuring the initial viscosity of each binary composite system solution, then filtering by using microporous filter membranes with different apertures under constant pressure, and measuring the viscosity of filtrate;
s12, in a rectangular coordinate system, drawing a change curve of the relative viscosity of a filtrate of the composite system along with the aperture of the filter membrane by taking the aperture size of the microporous filter membrane as an abscissa and the relative viscosity of the composite system as an ordinate; composite system relative viscosity = composite system filtrate viscosity/composite system solution initial viscosity;
s13, in a change curve of the relative viscosity of the filtrate of the composite system along with the aperture of the filter membrane, finding out an inflection point of the change curve by making an intersection point of tangent lines of the change curve before and after the relative viscosity changes, wherein an abscissa value corresponding to the inflection point is the hydrodynamic radius of the binary composite system;
s2, determining each hydrodynamic radius R in the step S1 according to the bridging theory h Matched minimum pore throat radius R m ，R m ＝R h 0.46, drawing a polymer concentration-adjuvant concentration-minimum pore throat radius chart with the polymer concentration as an abscissa and the adjuvant concentration as an ordinate;
s3, selecting other types of polymers from the multiple types of alternative polymers respectively, and repeating the steps S1 and S2 to obtain polymer concentration-adjuvant concentration-minimum pore throat radius patterns of the different types of polymers;
s4, determining a corresponding polymer-auxiliary agent binary composite system in each polymer concentration-auxiliary agent concentration-minimum pore throat radius plate according to the average pore throat radius of the target oil reservoir, and determining a binary composite system with the maximum viscosity in all obtained polymer-auxiliary agent binary composite systems to obtain an optimal polymer-auxiliary agent binary composite system formula.
2. The method for optimizing the formulation of the binary composite system for oil displacement based on pore-throat radius suitability as claimed in claim 1, wherein in the step S1, the constant pressure during filtration by the microporous filter membrane is 0.2MPa.
3. The method for optimizing the formulation of the binary composite system for oil displacement based on pore-throat radius suitability as claimed in claim 1, wherein in the step S1, the size of the microporous filter membrane is in the range of 0.10-3.00 μm.
4. The method for optimizing the formula of the binary compound system for oil displacement based on pore-throat radius suitability as claimed in claim 1, wherein in the step S1, the concentration of the polymer ranges from 500mg/L to 3000mg/L, the concentration of the surfactant ranges from 500mg/L to 3000mg/L, and the concentration of the alkali ranges from 0.2% to 1.2% in percentage by mass.
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