CN109612897A - The quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution - Google Patents

The quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution Download PDF

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CN109612897A
CN109612897A CN201811115918.5A CN201811115918A CN109612897A CN 109612897 A CN109612897 A CN 109612897A CN 201811115918 A CN201811115918 A CN 201811115918A CN 109612897 A CN109612897 A CN 109612897A
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water
core
distribution
spectrum
throat
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CN201811115918.5A
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赵金省
任大忠
付美涛
高辉
张益�
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西安石油大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/088Investigating volume, surface area, size or distribution of pores; Porosimetry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • G01N24/08Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
    • G01N24/081Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30Assessment of water resources

Abstract

The invention discloses the quantitative evaluation methods that produced-water reinjection influences tight sand physical property and throat distribution, prepare rock core, gas permeability first;Configuration work liquid, rock core vacuumizing are saturated working solution, calculate core porosity;Test nuclear magnetic resonance T2Spectrum, obtains the original throat distribution of core sample;Nuclear magnetic resonance T is tested again after rock core centrifugation2Spectrum, obtains the throat distribution that the original immovable fluid of core sample occupies;Rock core injects processed sewage;Rock core after water filling is dried into gas permeability, saturated water surveys core porosity again;Test nuclear magnetic resonance T2Spectrum, the throat distribution after obtaining core sample water filling;Nuclear magnetic resonance T is tested again after rock core centrifugation2Spectrum, the throat distribution that the immovable fluid after obtaining core sample water filling occupies;The T that will be measured2Spectrum is converted into pore throat radius distribution, influence of the quantitative analysis low permeability sandstone reservoir produced-water reinjection to reservoir properties and throat distribution.

Description

The quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution
Technical field
The invention belongs to oil-gas field development technical fields, and in particular to a kind of produced-water reinjection is to tight sand physical property and pore throat It is distributed the quantitative evaluation method influenced.
Background technique
China's low permeability oil field is widely distributed, in 7 sections of the long 6- long of Ordos Basin Triassic Yanchang Formation, Zhunger Basin Basin Permian System reed grass ditch group, in the Sichuan Basin-Lower Jurassic Series and Song-liao basin Cretaceous System Qingshankou group-spring head group all send out Educate hyposmosis petroleum resources abundant.Low-permeability oil deposit is since it is low with permeability, fluid supply capacity is poor, strata pressure decline is fast The features such as, it generally takes to oil-bearing stratum flooding and keeps oil layer energy.With the progress of water flooding, in particular to water filling Later period, a large amount of water flooding are plucked out of with crude oil to ground, if these sewage direct emissions must pollute the environment, if Discharge can greatly increase the production cost in oil field after processing.Especially for the Northwest for being located in water resources shortage, national ring The sustainable development for protecting regulation and water resource is required to re-injection oil reservoir, reduction outlet after sewage treatment.Since hyposmosis is stored up Layer pore throat is tiny, especially sensitive to water quality, although most oilfields sewage all can be practical raw by certain processing before re-injection Discovery is produced, produced-water reinjection will cause reservoir damage, and water injection pressure increases, and then influences waterflooding effect.Current research focuses mostly on Core damage is evaluated indoors, the variation of reservoir permeability caused by the change of water quality of macroscopical analysis sewage, without from micro- Pore throat blocking and the variation of throat distribution, movable fluid porosity as caused by injection water quality are studied in sight.
In existing research, CN101973641A discloses a kind of hyposmosis/extra permeability oilfield oil extraction-generated waste water reinjection technology Method.CN105130132A discloses a kind for the treatment of process of condensed oil sewage re-injection low permeability oil field, and CN101786739B is announced A kind of oil extraction wastewater treatment method used for oilfield reinjection, CN203050667U disclose a kind of oil field development water injection well extraction sewage Filter device.Gao Bo et al. is in 2010 in " offshore oil " the 1st phase " western rejection of oil flied effluent formation damage evaluating of Bohai Sea of volume 30 Research and chemoproection measure " the Lab-evaluation research of having carried out the western rejection of oil flied effluent of Bohai Sea in a text, by computer forecast, Sewage and stratum water-compatible are studied in static fouling experiment and dynamic scale formation experiment.Stone capital equality people in 2002 Pass through sewage and water flooding in " Minerals And Rocks " the 2nd phase " experimental study of virus-free potato plants north 3rd area produced-water reinjection " text of volume 22 Mixed static experimental result, and simulation stratum condition does rock core flowing experiment, discovery by the produced-water reinjection of extraction to stratum and After water flooding mixing, can also in-place permeability be made to decline, and with the increase of sewage content, permeability injury degree increases.Lee It is strong et al. in 2007 in " drilling technique " the 6th phase " damage research of the 27 fault block oil reservoir produced-water reinjection of king to water absorption layer " of volume 30 In one text, showing that injection water quality is not up to standard and water injection technology is unreasonable by the flowing experiment of injection water and rock core is to make It is exceeded exceeded with the insoluble solid phase particles partial size that suspends in water at the basic reason that water absorption layer damages, including oil content.Cao Xiaomao in 2012 in " oil-gas field surface engineering " the 2nd phase " extra permeability oilfield water treatment and produced-water reinjection " text of volume 31, needle Plain filter is difficult to make to inject the case where water reaches injection standard, injection water is carried out using the double-deck expansion type fine filter Processing, preferably solve the problems, such as that water quality inferiority and sewage cannot complete re-injections.Sun Ning et al. is in 2016 in the " present ageization Work " in the 4th phase " rejection of oil flied effluent is to the different permeability reservoir damage evaluation studies " text of volume 45, it is real to pass through rock core flowing It tests, analyzes extent of injury caused by rock core of the return water to different permeability ranks, define research area's produced-water reinjection The index request of concentration of suspension.The above method or technology are to grind for produced-water reinjection to what the injury of reservoir permeability carried out Study carefully, is not directed to the evaluation of the blocking of pore throat caused by produced-water reinjection.
When carrying out the throat distribution research of tight sand using pressure mercury method, often it is not achieved 100% into mercury saturation degree, because This mercury pressuring data not can reflect considerable micro-pore in tight rock, and nitrogen adsorption method is difficult to due to the nitrogen of absorption Desorption completely, so core sample is unable to duplicate measurements, CT scanning method usually requires to carry out rock sample cutting to damage rock Heart sample.
Summary of the invention
The purpose of the present invention is to provide a kind of produced-water reinjections to comment tight sand physical property and quantifying for throat distribution influence Valence method, to overcome defect of the existing technology, the present invention utilizes nuclear magnetic resonance measuring technology, causes from microcosmic upper quantitative assessment Influence of the close sandstone produced-water reinjection to reservoir properties and throat distribution can further disclose produced-water reinjection to the injury machine of reservoir Reason, facilitates the standardization and high efficiency of instructing low permeability sandstone reservoir waterflooding extraction, and then low permeability sandstone reservoir is instructed to infuse Enter the water treatment of water, reduces injury of the injection water to low permeability reservoir.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
The quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution, comprising the following steps:
Step 1: the true sandstone rock core of certain low permeability reservoir is chosen, gas surveys core sample permeability after washing oil drying;Root Simulated formation water is prepared according to salinity and the ion composition of oilfield sewage;The injection water that rock core corresponds to operation area is extracted, that is, is handled The sewage crossed;
Step 2: vacuumizing core sample and high pressure saturation simulation water flooding, calculates core porosity and pore volume;
Step 3: the core sample that step 2 is obtained tests nuclear magnetic resonance T2Spectrum, obtains the original pore throat of core sample Distribution;Then rock core is placed in centrifugation apparatus and is centrifuged, remove the moveable water in rock core, test nuclear magnetic resonance T again2 Spectrum, obtains the throat distribution that the original immovable fluid of core sample occupies;
Step 4: the core sample that step 3 is obtained connects displacement process, and experimental temperature is arranged, infuses into core sample Enter the injection water sample that scene is fetched;
Step 5: the core sample that step 4 is obtained is dried, gas permeability;Then rock core vacuumizing is saturated and is distilled Water, testing rock core porosity;
Step 6: the core sample that step 5 is obtained tests nuclear magnetic resonance T2Spectrum, the hole after obtaining core sample water filling Larynx distribution;Then rock core is placed in centrifugation apparatus and is centrifuged, removed the moveable water in rock core, test nuclear magnetic resonance again T2Spectrum, the throat distribution that the immovable fluid after obtaining core sample water filling occupies;
Step 7: the T before and after the centrifugation that step 3 and step 6 are measured2Spectrum is plotted in respectively on two figures, and T2Spectrum It is converted into pore throat radius distribution;
Step 8: according to the T measured2Spectrum and pore throat radius distribution curve, rock core pore throat radius after quantitative analysis water drive Distribution and the variation of movable fluid porosity.
Further, core sample diameter described in step 1 be 2.5cm, length 4.0cm.
Further, the pressure of the saturation of high pressure described in step 2 is 30MPa.
Further, centrifugation time is 120min, centrifugal speed 9000r/min in step 3 and step 6.
Further, step 4 injection rate is 0.1mL/min, and injection length is 24 hours.
Further, drying temperature is 80 DEG C in step 5, and drying time is 24 hours.
Further, use following formula by nuclear magnetic resonance T in step 72Spectrum is converted into pore throat radius:
In formula: r is pore throat radius, μm;
T2For the lateral relaxation time that nuclear magnetic resonance measures, ms;
For core porosity, %;
K is core permeability, mD.
Compared with prior art, the invention has the following beneficial technical effects:
The present invention, can be from microcosmic upper point by the variation of the throat distribution and movable fluid porosity of comparison water filling front and back Analysis water filling is injured caused by reservoir, waterflooding extraction is further instructed, relative to mercury injection method, nitrogen adsorption and CT scan side Method, the magnetic nuclear resonance method that the present invention uses, which tests pore throat radius distribution, to be had repeatable measurement, not to damage core sample, energy in fact The advantages that precise measurement now is carried out to micro-nano pore throat.
Detailed description of the invention
Fig. 1 is the pore throat radius distribution map of the rock core water filling front and back of embodiment one;
Fig. 2 is the pore throat radius distribution map of the rock core water filling front and back of embodiment two.
Specific embodiment
It is described further combined with specific embodiments below:
Embodiment one
The embodiment chooses the rock core and injection water of the oil field Ordos Basin JB Y9 reservoir, main to investigate injection water and ground The injury that layer water is incompatible to reservoir.
A kind of quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution, comprising the following steps:
Step 1: drilling through the core sample of diameter 2.5cm length 4.0cm, washing oil drying from full-hole core, and gas surveys rock Heart permeability is 4.25 × 10-3μm2;Simulated formation water is prepared according to the salinity of oilfield sewage and ion composition, extracts rock core The Analysis Results of Water Quality of the injection water of corresponding operation area, water flooding and injection water is shown in Table 1.
Step 2: vacuumizing core sample and high pressure saturation simulation water flooding, calculates core porosity 8.36%;
Step 3: the core sample that step 2 is obtained tests nuclear magnetic resonance T2Spectrum, obtains the original pore throat of core sample Distribution;Then rock core is placed in centrifugation apparatus and centrifugation 120min is carried out with the speed of 9000r/min, remove in rock core can Dynamic water, tests nuclear magnetic resonance T again2Spectrum, obtains the throat distribution that the original immovable fluid of core sample occupies;According to centrifugation The T of front and back2It is 5.18% that spectrum integral distribution curve, which can acquire movable fluid porosity,.
Step 4: the core sample that step 3 is obtained is placed in core holding unit, connects displacement process, setting experiment temperature 50 DEG C of degree, is filled the water with the injection rate of 0.1mL/min into core sample;
Step 5: the core sample that step 4 is obtained is placed in 80 DEG C of insulating boxs and dries 24 hours, and gas permeability is 2.86×10-3μm2;Then rock core vacuumizing is saturated distilled water, testing rock core porosity is 6.26%;
Step 6: the core sample that step 5 is obtained tests nuclear magnetic resonance T2Spectrum, the hole after obtaining core sample water filling Larynx distribution;Then rock core is placed in centrifugation apparatus and carries out centrifugation 120min, removed the moveable water in rock core, test core again Magnetic resonance T2Spectrum, the throat distribution that the immovable fluid after obtaining core sample water filling occupies;According to the T of centrifugation front and back2Spectrum accumulation It is 3.65% that distribution curve, which can acquire movable fluid porosity,.
Step 7: the T before and after the centrifugation for according to the following formula measuring step 3 and step 62Spectrum is converted into pore throat radius Distribution, is shown in Fig. 1;
In formula: r is pore throat radius, μm;
T2For the lateral relaxation time that nuclear magnetic resonance measures, ms;
For core porosity, %;
K is core permeability, mD.
Step 8: according to pore throat radius distribution curve, the distribution of rock core pore throat radius and movable after quantitative analysis water drive The variation of fluid porosity.
1 oil field JB Y9 reservoir formation water of table and injection water ion composition
The physical property and movable fluid porosity of 2 rock core of table water filling front and back
As can be seen from Table 2, the porosity and permeability of rock core after charging reduces, and porosity is dropped to by 8.36% 6.26%, fall 25.12%.Permeability is by 4.25 × 10-3μm2Drop to 2.86 × 10-3μm2, fall reaches 32.71%.Movable fluid porosity drops to 3.65% by 5.18%, fall 29.54%.As seen from Figure 1, it fills the water Pore throat radius distribution afterwards is changed, and (0.004 μm -0.11348 μm) change of aperture is more, and the porosity occupied is increased by 1.96% It is added to 3.32%.Macropore (0.11348 μm -9.869 μm) tails off, and the porosity occupied drops to 2.94% by 6.40%.Analysis Reason, although injection water is to have passed through certain processing by sewage, as can be seen from Table 1, treated injects water also Ca2+And Mg2+, water is injected under the conditions of certain temperature in this way and water flooding mixes calcium sulfate easy to form and precipitation of calcium carbonate, into And block a part of pore throat.The blocking of calcium sulfate and precipitation of calcium carbonate to some big pore throats, forms a large amount of aperture, makes rock core Throat distribution change, i.e., a part of macropore reduce while form more apertures.Finally make the infiltration of rock core Rate, porosity and movable fluid reduction in porosity.
Embodiment two
The embodiment chooses the rock core and injection water of the oil field Ordos Basin HB C6 reservoir, main to investigate in injection water Injury of the insoluble solid phase particles to reservoir.
A kind of quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution, comprising the following steps:
Step 1: drilling through the core sample of diameter 2.5cm length 4.0cm, washing oil drying from full-hole core, and gas surveys rock Heart permeability is 3.46 × 10-3μm2;In order to individually investigate injury of the insoluble solid phase particles in injection water to reservoir, simulation ground Layer water uses deionized water, that is, distilled water.The injection water that rock core corresponds to operation area is extracted, the Analysis Results of Water Quality for injecting water is shown in Table 1。
Step 2: vacuumizing core sample and high pressure saturation simulation water flooding, calculates core porosity 6.28%;
Step 3: the core sample that step 2 is obtained tests nuclear magnetic resonance T2Spectrum, obtains the original pore throat of core sample Distribution;Then rock core is placed in centrifugation apparatus and centrifugation 120min is carried out with the speed of 9000r/min, remove in rock core can Dynamic water, tests nuclear magnetic resonance T again2Spectrum, obtains the throat distribution that the original immovable fluid of core sample occupies;According to centrifugation The T of front and back2It is 4.17% that spectrum integral distribution curve, which can acquire movable fluid porosity,.
Step 4: the core sample that step 3 is obtained is placed in core holding unit, connects displacement process, setting experiment temperature 50 DEG C of degree, is filled the water with the injection rate of 0.1ml/min into core sample;
Step 5: the core sample that step 4 is obtained is placed in 80 DEG C of insulating boxs and dries 24 hours, and gas permeability is 2.05×10-3μm2;Then rock core vacuumizing is saturated distilled water, testing rock core porosity is 4.59%;
Step 6: the core sample that step 5 is obtained tests nuclear magnetic resonance T2Spectrum, the hole after obtaining core sample water filling Larynx distribution;Then rock core is placed in centrifugation apparatus and carries out centrifugation 120min, removed the moveable water in rock core, test core again Magnetic resonance T2Spectrum, the throat distribution that the immovable fluid after obtaining core sample water filling occupies;According to the T of centrifugation front and back2Spectrum accumulation It is 3.02% that distribution curve, which can acquire movable fluid porosity,.
Step 7: the T before and after the centrifugation for according to the following formula measuring step 3 and step 62Spectrum is converted into pore throat radius Distribution, is shown in Fig. 2;
In formula: r is pore throat radius, μm;
T2For the lateral relaxation time that nuclear magnetic resonance measures, ms;
For core porosity, %;
K is core permeability, mD.
Step 8: according to pore throat radius distribution curve, the distribution of rock core pore throat radius and movable after quantitative analysis water drive The variation of fluid porosity.
The analysis of 3 oil field HB C6 reservoir injection water quality of table
Analysis project Analyze result Professional standard
Oil content (mg/L) 4.26 ≤5
Insoluble solid phase particles (mg/L) 35.6 ≤1
Median particle size (μm) 3.48 ≤1
Total iron content (mg/L) 0.27 ≤0.5
The physical property and movable fluid porosity of 4 rock core of table water filling front and back
As can be seen from Table 4, the porosity and permeability after rock core water filling reduces, and porosity is dropped to by 6.28% 4.59%, fall 26.91%.Permeability is by 3.46 × 10-3μm2Drop to 2.05 × 10-3μm2, fall reaches 40.75%.Movable fluid porosity drops to 3.02% by 4.17%, fall 27.58%.As seen from Figure 1, it fills the water Pore throat radius distribution afterwards is changed, and (0.001 μm -0.029 μm) change of aperture is more, and the porosity occupied is increased by 2.24% To 3.61%.Macropore (0.029 μm -20.46 μm) tails off, and the porosity occupied drops to 0.98% by 4.04%.Reason is analyzed, As can be seen from Table 3, although oil content and total iron content are below the mark in industry, the insoluble solid phase of injection water that treated Grain content and median particle size greatly exceed professional standard, these particles can form blocking to some big pore throats, and then be formed A large amount of aperture, makes the throat distribution of rock core change.Finally make permeability, porosity and the movable fluid hole of rock core Porosity decline.

Claims (7)

1. the quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution, which is characterized in that including following Step:
Step 1: the true sandstone rock core of certain low permeability reservoir is chosen, gas surveys core sample permeability after washing oil drying;According to oil Salinity and the ion composition of field recovered water prepare simulated formation water;Extract the injection water that rock core corresponds to operation area;
Step 2: vacuumizing core sample and high pressure saturation simulation water flooding, calculates core porosity and pore volume;
Step 3: the core sample that step 2 is obtained tests nuclear magnetic resonance T2Spectrum, obtains the original throat distribution of core sample; Then rock core is placed in centrifugation apparatus and is centrifuged, remove the moveable water in rock core, test nuclear magnetic resonance T again2Spectrum, obtains The throat distribution that the immovable fluid original to core sample occupies;
Step 4: the core sample that step 3 is obtained connects displacement process, and experimental temperature is arranged, and injects into core sample existing The injection water sample that field is fetched;
Step 5: the core sample that step 4 is obtained is dried, gas permeability;Then rock core vacuumizing is saturated distilled water, Testing rock core porosity;
Step 6: the core sample that step 5 is obtained tests nuclear magnetic resonance T2Spectrum, the pore throat point after obtaining core sample water filling Cloth;Then rock core is placed in centrifugation apparatus and is centrifuged, remove the moveable water in rock core, test nuclear magnetic resonance T again2 Spectrum, the throat distribution that the immovable fluid after obtaining core sample water filling occupies;
Step 7: the T before and after the centrifugation that step 3 and step 6 are measured2Spectrum is plotted in respectively on two figures, and T2Spectrum conversion For pore throat radius distribution;
Step 8: according to the T measured2Spectrum and pore throat radius distribution curve, after quantitative analysis water drive the distribution of rock core pore throat radius with And the variation of movable fluid porosity.
2. the quantitative evaluation method that produced-water reinjection according to claim 1 influences tight sand physical property and throat distribution, It is characterized in that, core sample diameter described in step 1 is 2.5cm, length 4.0cm.
3. the quantitative evaluation method that produced-water reinjection according to claim 1 influences tight sand physical property and throat distribution, It is characterized in that, the pressure of the saturation of high pressure described in step 2 is 30MPa.
4. the quantitative evaluation method that produced-water reinjection according to claim 1 influences tight sand physical property and throat distribution, It is characterized in that, centrifugation time is 120min, centrifugal speed 9000r/min in step 3 and step 6.
5. the quantitative evaluation method that produced-water reinjection according to claim 1 influences tight sand physical property and throat distribution, It is characterized in that, step 4 injection rate is 0.1mL/min, injection length is 24 hours.
6. the quantitative evaluation method that produced-water reinjection according to claim 1 influences tight sand physical property and throat distribution, It is characterized in that, drying temperature is 80 DEG C in step 5, drying time is 24 hours.
7. the quantitative evaluation method that produced-water reinjection according to claim 1 influences tight sand physical property and throat distribution, It is characterized in that, using following formula by nuclear magnetic resonance T in step 72Spectrum is converted into pore throat radius:
In formula: r is pore throat radius, μm;
T2For the lateral relaxation time that nuclear magnetic resonance measures, ms;
For core porosity, %;
K is core permeability, mD.
CN201811115918.5A 2018-09-25 2018-09-25 The quantitative evaluation method that produced-water reinjection influences tight sand physical property and throat distribution CN109612897A (en)

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