CN105092447A - Simulation test method of interlayer heterogeneity improvement based on polymer - Google Patents
Simulation test method of interlayer heterogeneity improvement based on polymer Download PDFInfo
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- CN105092447A CN105092447A CN201410751159.7A CN201410751159A CN105092447A CN 105092447 A CN105092447 A CN 105092447A CN 201410751159 A CN201410751159 A CN 201410751159A CN 105092447 A CN105092447 A CN 105092447A
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Abstract
The invention relates to a simulation test method of interlayer heterogeneity improvement based on a polymer. The method comprises 1, preparing a copolymer mother liquor from saline water, 2, filling a two dimensional heterogeneous model sand filling area with quartz sand, 3, determining stable pressure of the heterogeneous model in a saturated water state, calculating permeability, determining a heterogeneous model pore volume by a draining gas-collection method, calculating porosity, recording outlet liquid amounts at outlets of the heterogeneous model, pouring a copolymer solution into the heterogeneous model, recording outlet liquid amounts at outlets of the heterogeneous model, switching a valve, carrying out follow-up water flooding until pouring pressure is stable, and recording outlet liquid amounts at outlets of the heterogeneous model. The above simulation test method shows that the modified nanometer SiO2-AA-Am copolymer solution entwines to form a space net structure so that adsorption and retention in a porous medium are improved, high-permeability layer permeability is effectively reduced and interlayer heterogeneity is improved.
Description
Technical field
The present invention relates to the technical field of oil exploitation, more particularly, the present invention relates to the analog detection method that a kind of multipolymer improves interlayer heterogeneity.
Background technology
Reservoir Heterogeneity is caused jointly by deposition, diagenesis and tectonization.At early field life, mostly be natural energy exploitation, the impact performance of reservoir heterogeneity on oil-field development is not obvious.But at middle-late waterflooding stage, occur in the plane in developing, layer and interlayer contradiction.For general nonmarine deposit oil reservoir, oil-bearing series is many, and oil reservoir macroscopic heterogeneity is strong, causes water flooding effectiveness difference comparatively large, especially for the Complex Fault Block Oil Reservoir that nonuniformity is stronger.Generally there is the feature that interlayer contradiction is given prominence to, waterflood recovery efficiency factor is low and development degree is low in heterogeneous reservoir, oil field is in waterflooding process, reservoir interlayer heterogeneity can cause interlayer interference, badly influence water drive swept volume and oil recovery factor, thus badly influence the whole development effect in oil field.Interlayer heterogeneity can cause injecting water and advance by leaps and bounds along most permeable zone.The difference of permeability is the main manifestations of nonuniformity between substratum, and permeability size may differ several times, Ji Shibei, and what have may up to hundred times.Therefore, injecting water can first along most permeable zone channelling, and this phenomenon often occurs when commingled water injection.Inject water and enter oil well rapidly, make well water increase rapidly, even serious water logging.But, low permeability pay to involve degree but very low, there is a large amount of remaining oils in the earth formation and be not plucked out of.
Summary of the invention
In order to solve the above-mentioned technical matters existed in prior art, a kind of multipolymer is the object of the present invention is to provide to improve the analog detection method of interlayer heterogeneity.
To achieve these goals, present invention employs following technical scheme:
A kind of multipolymer improves the analog detection method of interlayer heterogeneity, the device that described analog detection method uses comprises constant temperature oven, be arranged on the two-dimentional non-homogeneous model in constant temperature oven, the container of salt solution and copolymer solution can be injected to described two-dimentional non-homogeneous model, detect the pressure acquisition system of injection pressure, and for the liquid trap from described two-dimentional non-homogeneous model transudate; It is characterized in that: described analog detection method comprises the following steps:
(4) with salt solution configuration multipolymer mother liquor, and the concentration of multipolymer in described multipolymer mother liquor is made to be 2000mg/L;
(5) silica sand is utilized to fill two-dimentional non-homogeneous model back-up sand district;
(6) with 5mL/min flow velocity saturation water, measure steady pressure during non-homogeneous model saturation water, calculate permeability; Measured the volume of voids of non-homogeneous model by draining water gathering of gas law, calculate factor of porosity; And record the liquid outlet quantity that non-homogeneous model respectively exports; Copolymer solution is injected, the liquid outlet quantity that record non-homogeneous model respectively exports with the flow velocity of 5mL/min; Stop when injection rate IR reaches 0.5PV injecting, switch valve, start sequent water flooding; Sequent water flooding is carried out with the flow velocity of 5mL/min, until injection pressure tends to be steady, the liquid outlet quantity that record non-homogeneous model respectively exports.
Wherein, described two-dimentional non-homogeneous model back-up sand region is divided into upper, middle and lower three layers, uses 120 ~ 160 orders, 80 ~ 100 orders and 20 ~ 60 object silica sand fillings respectively, obtain basic, normal, high pervious course.
Wherein, described silica sand adopts the salt acid elution of 15wt%, and carries out washing and drying.
Wherein, described constant temperature oven maintains temperature in it is 70.0 DEG C.
Wherein, described multipolymer is prepared by the method comprised the following steps: (1) is by modified Nano SiO
2function monomer, acrylamide and acrylic acid mix, and adjust ph to 7.4, add distilled water and be made into the aqueous solution that monomer total mass concentration is 25.7%, in described monomer, acrylamide and acrylic acid mass ratio are 3.35, modified Nano SiO
2the content of function monomer is 0.5wt%; Add initiating agent, logical nitrogen protection, reacts under temperature is 40.4 DEG C of conditions; Reaction product can obtain described multipolymer after washing, pulverizing, drying; Wherein the quality of initiating agent is the 0.20wt% of described monomer gross mass, and described initiating agent is the potpourri of ammonium persulfate and sodium bisulfite, and the mol ratio of the two is 1: 1.
Wherein, described modified Nano SiO
2function monomer adopts the method comprised the following steps to prepare: (1) utilizes Nano-meter SiO_2
2with 3-aminopropyl triethoxysilane in the anhydrous toluene solution of 80 ~ 100 DEG C, reaction 12h obtains amino modified Nano-meter SiO_2
2, and control Nano-meter SiO_2 by the addition of control 3-aminopropyl triethoxysilane
2the content of surface amino groups; (2) excessive maleic anhydride and amino modified Nano-meter SiO_2 is utilized
2be obtained by reacting the modified Nano SiO with carbon-carbon double bond
2function monomer; It comprises following operation: 1. in DMF solution, add maleic anhydride, stirring and dissolving obtains mixed solution completely; 2. at amino modified Nano-meter SiO_2
2in add DMF and stir and obtain dispersion liquid; 3. be then added in the mixed solution that 1. operation obtain by operating the dispersant liquid drop that 2. obtains, then complete at 70 ~ 80 DEG C of stirring reactions, the reaction product obtained through washing, filter, obtain the modified Nano SiO with carbon-carbon double bond after drying
2function monomer.
Wherein, described amino modified Nano-meter SiO_2
2surface amino groups molar weight is Nano-meter SiO_2 before modified
228% of surface hydroxyl molar weight and 36%.
Accompanying drawing explanation
The infrared spectrogram of multipolymer polymer1 prepared by Fig. 1 embodiment 1 and multipolymer polymer2.
Fig. 2 is the two-dimentional non-homogeneous model experimental provision of application in embodiment 2.
Fig. 3 is the non-homogeneous model experiment flow figure of embodiment 2.
Fig. 4 is the injection pressure curve in embodiment 2.
Fig. 5 is the liquid outlet quantity situation of change of non-homogeneous model high permeability zones in embodiment 2.
Fig. 6 is the liquid outlet quantity situation of change of infiltration area in non-homogeneous model in embodiment 2.
Fig. 7 is the liquid outlet quantity situation of change in non-homogeneous model hyposmosis district in embodiment 2.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Described specific embodiment only for setting forth technical scheme of the present invention, and is not used in the protection domain limiting invention.
Embodiment 1 modified Nano SiO
2the preparation of-AA-AM multipolymer
Modified Nano SiO
2the preparation of function monomer
In the present embodiment, modified Nano SiO
2function monomer adopts the method comprised the following steps to prepare: (1) utilizes Nano-meter SiO_2
2with 3-aminopropyl triethoxysilane (KH540) in the anhydrous toluene solution of 80 DEG C, reaction 12h obtains amino modified Nano-meter SiO_2
2, and control Nano-meter SiO_2 by the addition of control 3-aminopropyl triethoxysilane
2the content of surface amino groups; (2) excessive maleic anhydride and amino modified Nano-meter SiO_2 is utilized
2be obtained by reacting the modified Nano SiO with carbon-carbon double bond
2function monomer.Following operation is comprised: 1. in DMF solution, add maleic anhydride, stirring and dissolving obtains mixed solution completely in step (2); 2. at amino modified Nano-meter SiO_2
2in add DMF and stir and obtain dispersion liquid; 3. be added in the mixed solution that 1. operation obtain by operating the dispersant liquid drop that 2. obtains, then complete at 70 DEG C of stirring reactions, the reaction product obtained through washing, filter, the modified Nano SiO with carbon-carbon double bond can be grafted with after drying
2.Wherein, hydrochloric acid-ethanol non-aqueous titration can be utilized in step (2) to judge amino modified Nano-meter SiO_2
2whether the amino on surface reacts completely.Grignard reagent titration measuring Nano-meter SiO_2 was adopted before the reaction of step (1)
2surface hydroxyl quantity, and measure Nano-meter SiO_2 by hydrochloric acid-ethanol non-aqueous titration after reacting
2the content of surface amino groups.The Nano-meter SiO_2 of different modification degree can be prepared by embodiment 1
2function monomer (can utilize amino modified Nano-meter SiO_2
2the molar weight of surface amino groups accounts for Nano-meter SiO_2 before modified
2the number percent of the molar weight of surface hydroxyl represents).
Modified Nano SiO is added in there-necked flask
2function monomer, acrylamide (AM) and acrylic acid (AA), use NaOH adjust ph, add distilled water and join monomer solution; Add initiating agent (mol ratio of ammonium persulfate and sodium bisulfite is 1: 1), logical nitrogen protection, reaction 6h; Reaction product can obtain modified Nano SiO through ethanol washing, pulverizing, oven dry
2-AA-AM multipolymer.Synthesis condition is: monomer total mass concentration is 25.7%, and acrylamide and acrylic acid mass ratio are 3.35, and initiating agent dosage is 0.20% of monomer gross mass, and temperature is 40.4 DEG C, and pH is 7.4, modified Nano SiO
2dosage is 0.5% of total monomer quality, Nano-meter SiO_2
2modification degree be 28% and 36% synthesis obtain multipolymer polymer1 and multipolymer polymer2.As shown in Figure 1, N-H stretching vibration absorption peak is positioned at 3402.3cm to the infrared spectrogram of multipolymer polymer1 and multipolymer polymer2
-1;-CH
2stretching vibration absorption peak is positioned at 2943.1cm
-1; C=O stretching vibration absorption peak is positioned at 1668.92cm
-1;-NH flexural vibrations absorption peak (in face) absorption peak is positioned at 1558.9cm
-1; C-N stretching vibration absorption peak is positioned at 1396.4cm
-1;-NH flexural vibrations absorption peak (outside face) absorption peak is positioned at 650.3cm
-1; SiO
2characteristic absorption peak be positioned at 1116.2cm
-1and 780.4cm
-1.Show to obtain modified Nano SiO
2-AA-AM terpolymer.
Embodiment 2 analog detection method
Study condition
(1) temperature: 70.0 DEG C;
(2) water quality: salt solution;
(3) flow velocity is injected: flow velocity when saturation water, note copolymer solution and sequent water flooding is 5mL/min;
(4) multipolymer used: modified Nano SiO
2-AA-AM multipolymer (copolymer 1, multipolymer 2), HPAM (AA-AM multipolymer);
(5) concentration of copolymer solution: 2000mg/L;
(6) experimental apparatus:
Micro pump: HBS-2000/20B1 type, twin-tub continuous high pressure constant speed and constant pressure pump, maximum working pressure (MOP) is 20MPa, and minimum injection rate is 0.01mL/min, and maximum pump discharge is 50.00mL/min, Haian Oil Scientific Research Apparatus Co., Ltd. of Jiangsu Province;
Intermediate receptacle: intermediate receptacle 2, capacity 2000mL, maximum working pressure (MOP) 20MPa, Jiangsu Haian Oil Scientific Research Apparatus Co., Ltd.;
Constant temperature oven: SG-3 constant temperature oven, Jiangsu Haian Oil Scientific Research Apparatus Co., Ltd.;
Stirrer: overhead stirrer, Jiangsu Poly scientific research apparatus company limited produces;
Pressure transducer: range 0 ~ 0.1MPa, precision is 0.1% of range, completion rock-electric test center, Chengdu;
Two dimension non-homogeneous model: the back-up sand of two-dimentional non-homogeneous model inside is of a size of 30cm × 4.5cm × 4.5cm (long × wide × high); Its structure as shown in Figure 2.
Non-homogeneous model flowing experiment
(1) preparation of copolymer solution
With the saline multipolymer mother liquor after filtration, concentration is 5000mg/L, dissolves the lean solution completely, it being diluted to 2000mg/L with salt solution, is uniformly mixed.
(2) silica sand pre-service
In order to get rid of the impact of the impurity such as carbonate and shale in silica sand, employing mass concentration is the salt acid elution silica sand of 15%, then cleans the silica sand after pickling with a large amount of tap water, is then dried by silica sand, for subsequent use according to different meshes screening.
(3) the filling and presenting of two-dimentional non-homogeneous model
Two-dimentional non-homogeneous model back-up sand region is divided into upper, middle and lower three layers, uses 120 ~ 160 orders, 80 ~ 100 orders and 20 ~ 60 order silica sand fillings respectively, obtain basic, normal, high pervious course, corresponding permeability is respectively 0.4D, 1.5D and 7.5D; Volume of voids (PV) is 206cm3, and factor of porosity is 33.9%.
(4) two-dimentional non-homogeneous model flowing experiment step
Saturation water: with 5mL/min flow velocity saturation water, measures steady pressure during non-homogeneous model saturation water, calculates permeability; Measured the volume of voids of non-homogeneous model by draining water gathering of gas law, calculate factor of porosity; And record the liquid outlet quantity that non-homogeneous model respectively exports.Note copolymer solution: inject copolymer solution with the flow velocity of 5mL/min, the liquid outlet quantity that record non-homogeneous model respectively exports; Stop when injection rate IR reaches 0.5PV injecting, switch valve, start sequent water flooding.Sequent water flooding: carry out sequent water flooding with the flow velocity of 5mL/min, until injection pressure tends to be steady, the liquid outlet quantity that record non-homogeneous model respectively exports.Its flow process as shown in Figure 3.
As shown in Figure 4, liquid outlet quantity corresponding to high, medium and low pervious course is as shown in Fig. 5, Fig. 6 and Fig. 7 for injection pressure curve in experimentation.As shown in Figure 4, in note copolymer solution process, injection pressure constantly raises along with the increase of injection rate IR, when injection rate IR reaches 0.5PV, the injection pressure of copolymer p olymer-2 is 0.0351MPa, the injection pressure of copolymer p olymer-1 is the injection pressure that 0.0229MPa, HPAM are corresponding is 0.0132MPa; After sequent water flooding is substantially steady to pressure, copolymer p olymer-2, the injection pressure that copolymer p olymer-1 and HPAM is corresponding are respectively 0.0109MPa, 0.0065MPa and 0.0031MPa.Above result shows, the injection pressure that copolymer p olymer-2 is corresponding is higher, can set up higher filtrational resistance, is conducive to low permeability layer in startup, so can play the effect improving interlayer heterogeneity, improve sweep efficiency.From Fig. 5, Fig. 6 and Fig. 7, after injection 0.5PV copolymer solution, the middle low permeability layer of non-homogeneous model obtains startup in various degree, and the liquid outlet quantity of its correspondence increases.After injection 0.5PV copolymer solution, the shunt volume of the most permeable zone that copolymer p olymer-2, Polymer-1 and HPAM are corresponding is respectively 54.2%, 61.0% and 65.8%, compared with during saturation water, have dropped 25.3%, 18.5% and 15.2% respectively.In sequent water flooding process, the shunt volume of most permeable zone increases, but compared with shunt volume during saturation water, when sequent water flooding is steady to pressure, the shunt volume of the most permeable zone that copolymer p olymer-2, Polymer-1 and HPAM are corresponding have dropped 14.5%, 8.9% and 5.9% respectively.For middle low permeability layer, after injecting copolymer solution, its shunt volume all increases, low permeability layer during copolymer p olymer-2 can start preferably.Above result shows, modified Nano SiO
2-AA-AM multipolymer has stronger improvement heterogeneity sexuality, is conducive to the longitudinal spread effect improving copolymer solution and follow-up displacing fluid.Think, this, mainly due to special dissaving structure, enhances modified Nano SiO
2the anti-shear performance of-AA-AM copolymer solution.Modified Nano SiO
2-AA-AM multipolymer, after shearing through mechanical shearing and porous medium, can have higher viscosity retention rate, be conducive to setting up higher filtrational resistance, thus middle low permeability layer is started.In addition, due to modified Nano SiO
2strand aggregation extent after the shearing of-AA-AM copolymer solution increases, mutually can tangle and form certain space net structure, make its absorption in porous medium, retentivity strengthens, effectively can reduce the permeability of most permeable zone, thus improve interlayer heterogeneity.Modified Nano SiO
2-AA-AM multipolymer has better compliance, viscoelasticity and deformation recovery capability, and copolymer molecule deformation can occur under displacement pressure effect by porous medium pore throat, so injection pressure curve exists the fluctuation of certain amplitude; After passing through pore throat, the strand that deformation occurs can recover again to a certain extent, becomes and unfolds, so copolymer solution can set up higher filtrational resistance in porous medium in salt solution.
Claims (7)
1. a multipolymer improves the analog detection method of interlayer heterogeneity, the device that described analog detection method uses comprises constant temperature oven, be arranged on the two-dimentional non-homogeneous model in constant temperature oven, the container of salt solution and copolymer solution can be injected to described two-dimentional non-homogeneous model, detect the pressure acquisition system of injection pressure, and for the liquid trap from described two-dimentional non-homogeneous model transudate; It is characterized in that: described analog detection method comprises the following steps:
(1) with salt solution configuration multipolymer mother liquor, and the concentration of multipolymer in described multipolymer mother liquor is made to be 2000mg/L;
(2) silica sand is utilized to fill two-dimentional non-homogeneous model back-up sand district;
(3) with 5mL/min flow velocity saturation water, measure steady pressure during non-homogeneous model saturation water, calculate permeability; Measured the volume of voids of non-homogeneous model by draining water gathering of gas law, calculate factor of porosity; And record the liquid outlet quantity that non-homogeneous model respectively exports; Copolymer solution is injected, the liquid outlet quantity that record non-homogeneous model respectively exports with the flow velocity of 5mL/min; Stop when injection rate IR reaches 0.5PV injecting, switch valve, start sequent water flooding; Sequent water flooding is carried out with the flow velocity of 5mL/min, until injection pressure tends to be steady, the liquid outlet quantity that record non-homogeneous model respectively exports.
2. analog detection method according to claim 1, it is characterized in that: described two-dimentional non-homogeneous model back-up sand region is divided into upper, middle and lower three layers, use 120 ~ 160 orders, 80 ~ 100 orders and 20 ~ 60 object silica sand fillings respectively, obtain basic, normal, high pervious course.
3. analog detection method according to claim 1, is characterized in that: described silica sand adopts the salt acid elution of 15wt%, and carries out washing and drying.
4. analog detection method according to claim 1, is characterized in that: it is 70.0 DEG C that described constant temperature oven maintains temperature in it.
5. analog detection method according to claim 1, is characterized in that: described multipolymer is prepared by the method comprised the following steps: (1) is by modified Nano SiO
2function monomer, acrylamide and acrylic acid mix, and adjust ph to 7.4, add distilled water and be made into the aqueous solution that monomer total mass concentration is 25.7%, in described monomer, acrylamide and acrylic acid mass ratio are 3.35, modified Nano SiO
2the content of function monomer is 0.5wt%; Add initiating agent, logical nitrogen protection, reacts under temperature is 40.4 DEG C of conditions; Reaction product can obtain described multipolymer after washing, pulverizing, drying; Wherein the quality of initiating agent is the 0.20wt% of described monomer gross mass, and described initiating agent is the potpourri of ammonium persulfate and sodium bisulfite, and the mol ratio of the two is 1: 1.
6. analog detection method according to claim 5, is characterized in that: described modified Nano SiO
2function monomer adopts the method comprised the following steps to prepare: (1) utilizes Nano-meter SiO_2
2with 3-aminopropyl triethoxysilane in the anhydrous toluene solution of 80 ~ 100 DEG C, reaction 12h obtains amino modified Nano-meter SiO_2
2, and control Nano-meter SiO_2 by the addition of control 3-aminopropyl triethoxysilane
2the content of surface amino groups; (2) excessive maleic anhydride and amino modified Nano-meter SiO_2 is utilized
2be obtained by reacting the modified Nano SiO with carbon-carbon double bond
2function monomer; It comprises following operation: 1. in DMF solution, add maleic anhydride, stirring and dissolving obtains mixed solution completely; 2. at amino modified Nano-meter SiO_2
2in add DMF and stir and obtain dispersion liquid; 3. be then added in the mixed solution that 1. operation obtain by operating the dispersant liquid drop that 2. obtains, then complete at 70 ~ 80 DEG C of stirring reactions, the reaction product obtained through washing, filter, obtain the modified Nano SiO with carbon-carbon double bond after drying
2function monomer.
7. analog detection method according to claim 6, is characterized in that: described amino modified Nano-meter SiO_2
2surface amino groups molar weight is Nano-meter SiO_2 before modified
228% of surface hydroxyl molar weight and 36%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104761930A (en) * | 2015-01-15 | 2015-07-08 | 西南石油大学 | Modified nanometer silica functional monomer for oil-displacement polymer |
| CN106769784A (en) * | 2017-02-10 | 2017-05-31 | 西南石油大学 | A kind of multi-functional heterogeneous core simulator |
| CN113356788A (en) * | 2020-03-06 | 2021-09-07 | 中国石油化工股份有限公司 | Visual simulation device and method for artificial partition plate of radial well structure |
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| JPH07198582A (en) * | 1993-12-29 | 1995-08-01 | Taisei Corp | Water permeation tester and method of inspecting water channel |
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| JPH07198582A (en) * | 1993-12-29 | 1995-08-01 | Taisei Corp | Water permeation tester and method of inspecting water channel |
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| CN104761930A (en) * | 2015-01-15 | 2015-07-08 | 西南石油大学 | Modified nanometer silica functional monomer for oil-displacement polymer |
| CN106769784A (en) * | 2017-02-10 | 2017-05-31 | 西南石油大学 | A kind of multi-functional heterogeneous core simulator |
| CN113356788A (en) * | 2020-03-06 | 2021-09-07 | 中国石油化工股份有限公司 | Visual simulation device and method for artificial partition plate of radial well structure |
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