CN101004134A - Method for explaining thick oil reservoir bed by using T2 relaxation spectrum - Google Patents
Method for explaining thick oil reservoir bed by using T2 relaxation spectrum Download PDFInfo
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- CN101004134A CN101004134A CNA2007100100457A CN200710010045A CN101004134A CN 101004134 A CN101004134 A CN 101004134A CN A2007100100457 A CNA2007100100457 A CN A2007100100457A CN 200710010045 A CN200710010045 A CN 200710010045A CN 101004134 A CN101004134 A CN 101004134A
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Abstract
The present invention relates to a method capable of utilizing T2 relaxation spectrum to interpret heavy oil reservoir. It is characterized by that said invention utilizes the difference of distributed zones of heavy oil, movable water and irreducible water on the T2 relaxation spectrum to separate them so as to attain the goal of effectively and accurately judging that the heavy oil reservoir is eater-flooded or not. The invented method includes the following steps: sampling, nuclear magnetic resonance analysis and T2 relaxation spectrum analysis and interpretation.
Description
Technical field:
The present invention relates to a kind of method that the viscous crude field drilling process is judged the reservoir water out behavior that is used for, belong to the application of nuclear magnetic resonance technique in the petroleum industry field.
Background technology:
The viscous crude field exploitation middle and later periods is to stepout well especially manhole, observe well and make an explanation and judge whether at present main application of electrical measurement method of water logging and geochemical analysis method.But in application process, electrical measuring method is subjected to the influence of factors such as rock matrix, mineralogical composition and formation water salinity, especially after the water logging, injecting water makes formation water salinity that variation take place, form ' polymorphic type water ' phenomenon, calculate before the water saturation of calculating with the A Erqi formula and the water logging not to contain water saturation contrast property relatively poor, can not accurately judge whether water logging of reservoir; The geochemical analysis method mainly is to detect the abundance of hydrocarbons in the reservoir, can't directly detect the existence of water, can only be by analyzing relatively and whether water logging of reservoir is judged in the exclusive method knowledge.Therefore, existing two kinds of methods all can not satisfy the needs of accurate judgement thick oil reservoir water out behavior.
Summary of the invention:
The object of the invention is to provide a kind of T2 relaxation spectrum that utilizes that can get rid of factor affecting such as rock matrix, mineral composition, formation water salinity, accurately judge the thick oil reservoir water out behavior to explain the method for thick oil reservoir.
Technical scheme of the present invention is as follows:
This kind method is that the zone that utilizes viscous crude, movable water, irreducible water to distribute on the T2 relaxation spectrum is different, thereby the three is made a distinction, reach effectively, accurately judge whether water logging of thick oil reservoir, for going on foot the purpose that development plan provides reliable basis, avoids invalid fund input down.The implementation step and the technical essential of this method are as follows:
1, sampling.Drilling and coring delivery goes out that rock core to be put into refrigerator-freezer behind the heart freezing, freezing rock core is carried out liquid nitrogen produce the rock core plunger, and the rock core diameter of plunger is 15-25mm, longly is 10-30mm, with the plastic fresh-keeping membrane parcel, prevents that profit scatters and disappears;
2, nuclear magnetic resonance spectroscopy.The rock core plunger is carried out nuclear magnetic resonance spectroscopy twice, record the T2 relaxation spectrum; Rock core plunger to the preservative film parcel carries out nuclear magnetic resonance spectroscopy for the first time, the T2 relaxation spectrum that records is the integrated signal of oil and water, the rock core plunger is immersed in the Mn2+ aqueous solution that concentration is 15000mg/L, carry out the nuclear magnetic resonance spectroscopy second time after 24 hours, because Mn2+ has shielded the NMR signal of water, the T2 relaxation spectrum that records is the NMR signal of oil;
3, T2 relaxation spectrum analysis interpretation.Carrying out thick oil reservoir according to the height of the T2 relaxation spectrum form that records and oil saturation, mobile water saturation explains.Because the relaxation time of viscous crude is short, its NMR signal and irreducible water signal overlap separate with movable water signal; Pass through Mn
2+Analyze for the second time after the aqueous solution soaking, viscous crude signal and irreducible water signaling zone are separated.Heavy oil tested layer and Water Flooding Layer T
2The relaxation spectrum feature is as follows:
Heavy oil tested layer T
2The relaxation spectrum feature: the viscous crude signal is strong, and oil saturation is greater than 60.0%; Weak or the nothing of movable water signal is at T
2Show as greater than T on the relaxation spectrum
2Weak or the nothing of nuclear magnetic signal in the relaxation time that ends, mobile water saturation is less than 10%; Thick oil reservoir Water Flooding Layer T
2The relaxation spectrum feature: a little less than the viscous crude signal, oil saturation is less than 60%, and movable water signal is strong, at T
2Relaxation spectrum shows as greater than T
2Nuclear magnetic signal is stronger in the relaxation time that ends, and the existence of movable water is an important symbol of judging the thick oil reservoir water logging, and mobile water saturation is greater than 10%.
The methods analyst object that utilizes the T2 relaxation spectrum to explain thick oil reservoir provided by the invention is the fluid in the rock sample, be not subjected to factor affecting such as rock, skeleton, mineral composition, formation water salinity, analyze good reproducibility, stability is strong, analysis speed is fast, and can accurately judge whether water logging of thick oil reservoir, for the development plan adjustment provides reliable basis.
Description of drawings:
Fig. 1 is the T2 relaxation spectrum characteristic curve diagram of heavy oil tested layer.
Fig. 2, Fig. 3, Fig. 4 are respectively the T2 relaxation spectrum characteristic curve diagram of viscous crude Water Flooding Layer
The specific embodiment:
The present invention is provided by following examples, is illustrated below in conjunction with accompanying drawing.
As shown in the figure: according to aforementioned the invention process step thick oil reservoir is carried out the water out behavior analysis, heavy oil tested layer T2 relaxation spectrum feature as shown in Figure 1, the T2 relaxation spectrum feature of Water Flooding Layer such as Fig. 2, Fig. 3, shown in Figure 4.In Fig. 1, in greater than the relaxation time of T2 cutoff movable water NMR signal a little less than, mobile water saturation is less than 10%, among Fig. 2, Fig. 3, Fig. 4, movable water T2 amplitude is stronger, mobile water saturation shows this heavy oil tested layer water logging greater than 10%.
Claims (1)
1, a kind of method of utilizing the T2 relaxation spectrum to explain thick oil reservoir, it is characterized in that: this method is that the zone that utilizes viscous crude, movable water, irreducible water to distribute on the T2 relaxation spectrum is different, thereby the three is made a distinction, reach effectively, accurately judge whether water logging of thick oil reservoir, for going on foot the purpose that development plan provides reliable basis, avoids invalid fund input down; The implementation step and the technical essential of this method are as follows:
(1), sampling: drilling and coring delivery, go out that rock core to be put into refrigerator-freezer behind the heart freezing, freezing rock core is carried out liquid nitrogen produces the rock core plunger, the rock core diameter of plunger is 15-25mm, longly is 10-30mm, with the plastic fresh-keeping membrane parcel, prevents that profit scatters and disappears;
(2), nuclear magnetic resonance spectroscopy: the rock core plunger is carried out nuclear magnetic resonance spectroscopy twice, record the T2 relaxation spectrum; Rock core plunger to the preservative film parcel carries out nuclear magnetic resonance spectroscopy for the first time, the T2 relaxation spectrum that records is the integrated signal of oil and water, the rock core plunger is immersed in the Mn2+ aqueous solution that concentration is 15000mg/L, carry out the nuclear magnetic resonance spectroscopy second time after 24 hours, because Mn2+ has shielded the NMR signal of water, the T2 relaxation spectrum that records is the NMR signal of oil;
(3), T2 relaxation spectrum analysis interpretation.Carry out thick oil reservoir according to the height of the T2 relaxation spectrum form that records and oil saturation, mobile water saturation and explain that because the relaxation time of viscous crude is short, its NMR signal and irreducible water signal overlap separate with movable water signal; Pass through Mn
2+Analyze for the second time after the aqueous solution soaking, viscous crude signal and irreducible water signaling zone are separated; Heavy oil tested layer, Water Flooding Layer T
2The relaxation spectrum feature is as follows:
Heavy oil tested layer T
2The relaxation spectrum feature: the viscous crude signal is strong, and oil saturation is greater than 60.0%; Weak or the nothing of movable water signal is at T
2Show as greater than T on the relaxation spectrum
2Weak or the nothing of nuclear magnetic signal in the relaxation time that ends, mobile water saturation is less than 10%; Thick oil reservoir Water Flooding Layer T
2The relaxation spectrum feature: a little less than the viscous crude signal, oil saturation is less than 60%, and movable water signal is strong, at T
2Relaxation spectrum shows as greater than T
2Nuclear magnetic signal is stronger in the relaxation time that ends, and the existence of movable water is an important symbol of judging the thick oil reservoir water logging, and mobile water saturation is greater than 10%.
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Cited By (14)
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| CN101942995A (en) * | 2010-09-16 | 2011-01-12 | 中国石油天然气股份有限公司 | Method for evaluating washing degree of ultralow permeability water-drive reservoir sandstone oil layer |
| CN103362505A (en) * | 2012-04-10 | 2013-10-23 | 中国石油化工股份有限公司 | Method for judging and identifying drilling-encounter oil layer under condition that drilling fluid adding oil exists |
| CN104278989A (en) * | 2013-07-02 | 2015-01-14 | 中国石油天然气股份有限公司 | Method for obtaining saturation index of low-porosity and low-permeability reservoir |
| CN105004745A (en) * | 2014-04-18 | 2015-10-28 | 中国石油化工股份有限公司 | Method for predicting crude oil viscosity through nuclear magnetic resonance spectrums |
| CN105093340A (en) * | 2015-08-05 | 2015-11-25 | 中国石油天然气股份有限公司 | Method and device for acquiring movable water volume of coal bed |
| CN105352847A (en) * | 2015-09-28 | 2016-02-24 | 中国石油大学(北京) | Fast crude oil viscosity measurement method |
| CN105486709A (en) * | 2015-12-17 | 2016-04-13 | 中国石油大学(北京) | Measuring method and device for underground thick oil molecule chain length |
| CN105804734A (en) * | 2016-04-12 | 2016-07-27 | 中国石油天然气集团公司 | Method for identifying thickened oil reservoir by utilizing nuclear magnetic resonance well logging |
| CN106837318A (en) * | 2016-12-23 | 2017-06-13 | 中国石油天然气股份有限公司 | Method and device for obtaining rock stratum thick oil content |
| CN107315024A (en) * | 2016-04-26 | 2017-11-03 | 中国石油化工股份有限公司 | A kind of method for recognizing tight sandstone reservoir oil-water-layer |
| CN109298008A (en) * | 2018-11-08 | 2019-02-01 | 中国石油天然气股份有限公司 | Method, device and system for analyzing oil-water content in porous medium displacement process |
| WO2019233000A1 (en) * | 2018-06-09 | 2019-12-12 | 中国石油大学(华东) | Isotope nuclear magnetic method for analyzing ineffective water absorption of rock pore |
| CN111505041A (en) * | 2020-05-21 | 2020-08-07 | 黑龙江菏沣达能源科技有限公司 | Shale oil saturation well site rapid evaluation method |
| CN112324421A (en) * | 2020-06-15 | 2021-02-05 | 中国海洋石油集团有限公司 | Method for calculating saturation before and after flooding of low-resistivity heavy oil reservoir |
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2007
- 2007-01-10 CN CNA2007100100457A patent/CN101004134A/en active Pending
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101942995B (en) * | 2010-09-16 | 2012-11-14 | 中国石油天然气股份有限公司 | Method for evaluating washing degree of ultralow permeability water-drive reservoir sandstone oil layer |
| CN101942995A (en) * | 2010-09-16 | 2011-01-12 | 中国石油天然气股份有限公司 | Method for evaluating washing degree of ultralow permeability water-drive reservoir sandstone oil layer |
| CN103362505B (en) * | 2012-04-10 | 2015-12-16 | 中国石油化工股份有限公司 | A kind of for sentencing the method known and bore and meet oil reservoir under add oily existence condition at drilling fluid |
| CN103362505A (en) * | 2012-04-10 | 2013-10-23 | 中国石油化工股份有限公司 | Method for judging and identifying drilling-encounter oil layer under condition that drilling fluid adding oil exists |
| CN104278989A (en) * | 2013-07-02 | 2015-01-14 | 中国石油天然气股份有限公司 | Method for obtaining saturation index of low-porosity and low-permeability reservoir |
| CN104278989B (en) * | 2013-07-02 | 2017-02-15 | 中国石油天然气股份有限公司 | Method for obtaining saturation index of low-porosity and low-permeability reservoir |
| CN105004745A (en) * | 2014-04-18 | 2015-10-28 | 中国石油化工股份有限公司 | Method for predicting crude oil viscosity through nuclear magnetic resonance spectrums |
| CN105004745B (en) * | 2014-04-18 | 2019-02-01 | 中国石油化工股份有限公司 | A method of viscosity of crude is predicted by nuclear magnetic resoance spectrum |
| CN105093340A (en) * | 2015-08-05 | 2015-11-25 | 中国石油天然气股份有限公司 | Method and device for acquiring movable water volume of coal bed |
| CN105352847A (en) * | 2015-09-28 | 2016-02-24 | 中国石油大学(北京) | Fast crude oil viscosity measurement method |
| CN105352847B (en) * | 2015-09-28 | 2018-11-02 | 中国石油大学(北京) | Viscosity of crude method for fast measuring |
| CN105486709A (en) * | 2015-12-17 | 2016-04-13 | 中国石油大学(北京) | Measuring method and device for underground thick oil molecule chain length |
| CN105486709B (en) * | 2015-12-17 | 2017-11-24 | 中国石油大学(北京) | The measuring method and device of thick oil underground well molecular chain length |
| CN105804734A (en) * | 2016-04-12 | 2016-07-27 | 中国石油天然气集团公司 | Method for identifying thickened oil reservoir by utilizing nuclear magnetic resonance well logging |
| CN105804734B (en) * | 2016-04-12 | 2018-10-16 | 中国石油天然气集团公司 | A method of identifying thick oil reservoir using nuclear magnetic resonance log |
| CN107315024A (en) * | 2016-04-26 | 2017-11-03 | 中国石油化工股份有限公司 | A kind of method for recognizing tight sandstone reservoir oil-water-layer |
| CN106837318A (en) * | 2016-12-23 | 2017-06-13 | 中国石油天然气股份有限公司 | Method and device for obtaining rock stratum thick oil content |
| CN106837318B (en) * | 2016-12-23 | 2020-01-07 | 中国石油天然气股份有限公司 | Method and device for obtaining rock stratum thick oil content |
| WO2019233000A1 (en) * | 2018-06-09 | 2019-12-12 | 中国石油大学(华东) | Isotope nuclear magnetic method for analyzing ineffective water absorption of rock pore |
| CN109298008A (en) * | 2018-11-08 | 2019-02-01 | 中国石油天然气股份有限公司 | Method, device and system for analyzing oil-water content in porous medium displacement process |
| CN109298008B (en) * | 2018-11-08 | 2022-02-01 | 中国石油天然气股份有限公司 | Method, device and system for analyzing oil-water content in porous medium displacement process |
| CN111505041A (en) * | 2020-05-21 | 2020-08-07 | 黑龙江菏沣达能源科技有限公司 | Shale oil saturation well site rapid evaluation method |
| CN112324421A (en) * | 2020-06-15 | 2021-02-05 | 中国海洋石油集团有限公司 | Method for calculating saturation before and after flooding of low-resistivity heavy oil reservoir |
| CN112324421B (en) * | 2020-06-15 | 2023-06-20 | 中国海洋石油集团有限公司 | Method for calculating saturation of low-resistivity thick oil layer before and after flooding |
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