CN116448643A - Method for determining core pore compression coefficient based on nuclear magnetic resonance technology - Google Patents
Method for determining core pore compression coefficient based on nuclear magnetic resonance technology Download PDFInfo
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- CN116448643A CN116448643A CN202310348290.8A CN202310348290A CN116448643A CN 116448643 A CN116448643 A CN 116448643A CN 202310348290 A CN202310348290 A CN 202310348290A CN 116448643 A CN116448643 A CN 116448643A
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- 239000011148 porous material Substances 0.000 title claims abstract description 47
- 230000006835 compression Effects 0.000 title claims abstract description 29
- 238000007906 compression Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 13
- 239000011435 rock Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000009738 saturating Methods 0.000 claims abstract description 3
- 238000010586 diagram Methods 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 102000011990 Sirtuin Human genes 0.000 claims description 3
- 108050002485 Sirtuin Proteins 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 210000002615 epidermis Anatomy 0.000 abstract description 2
- 239000008398 formation water Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- General Health & Medical Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention belongs to the technical field of oil and gas field development, and provides a method for determining a core pore compression coefficient based on nuclear magnetic resonance technology, which comprises the following steps: fully saturating stratum water by the rock core, measuring the rock porosity of the rock core sweep T2 map, recording a corresponding volume signal value of the rock porosity, and determining the pore volume of the rock core; and determining the compression coefficient of the core based on the core compression coefficient calculation formula. The invention can effectively avoid the influence of the epidermis effect and the manual operation, has reliable principle, simple and convenient operation and accurate and reliable measurement result, and has important significance for reasonable development of the oil and gas reservoir.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to a method for determining a core pore compression coefficient based on a nuclear magnetic resonance technology.
Background
The rock compression coefficient is an important parameter in the calculation of the mass balance of the oil and gas reservoir engineering and the interpretation of well test. Therefore, the compression coefficient of the rock core is accurately and simply calculated, and the method has important significance for reasonable development of the oil and gas reservoir.
When the compression coefficient of the rock is measured by the traditional volumetric method, the measurement result is higher in numerical value and has certain defects (the loosening compression coefficient of the rock is smaller) due to the influence of the epidermis effect and the manual operation error. Thus, there is a need for a method of determining the core pore compression factor.
Disclosure of Invention
The invention aims to provide a method for determining the core pore compression coefficient based on nuclear magnetic resonance technology, which has reliable principle, simple operation and accurate and reliable measurement result, can provide important parameters for the balance calculation and well test interpretation of oil and gas reservoir engineering materials,
in order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for determining core pore compression coefficient based on nuclear magnetic resonance technology, the method comprising:
fully saturating stratum water by the rock core, measuring the rock porosity of the rock core sweep T2 map, recording a corresponding volume signal value of the rock porosity, and determining the pore volume of the rock core;
and determining the compression coefficient of the core based on the core compression coefficient calculation formula.
Further, the method comprises the following specific steps:
measuring basic parameters of the rock core;
placing the rock core into a high-pressure-resistant intermediate container, vacuumizing the rock core for 12 hours, injecting stratum water, pressurizing to 30MPa, and standing for 24 hours to fully saturate the rock core with the stratum water;
the saturated stratum water core is put into a clamp holder matched with a nuclear magnetic resonance apparatus, an initial rock sample is scanned by a T2 spectrogram, and a corresponding volume signal value S at the moment is recorded 1 Determining the signal value S from the line of variation of the pore volume and the total signal 1 Corresponding core pore volume V 1 ；
Injecting fluorine oil into the cavity of the holder, continuously increasing confining pressure, sweeping the T2 map of the rock core, and reading out corresponding volume signal valuesS 2 The corresponding pore volume V is likewise determined 2 Until the confining pressure is increased to the net stress value of the stratum;
and determining the compression coefficients of the core under different stresses based on a core compression coefficient calculation formula.
Further, the core base parameters include:
length L, diameter d.
Further, the method for obtaining the relation line of the change between the pore volume and the total signal amount comprises the following steps:
selecting a plurality of standard samples with different porosities, measuring a T2 spectrogram of each corresponding standard sample, carrying out numerical inversion on the acquired attenuation data by adopting an SIRT method according to a T2 spectrogram attenuation curve, obtaining the total pore signal quantity of the standard samples through accumulation, drawing a relation diagram of the total pore volume and the total pore signal quantity, and fitting to obtain a change relation line between the pore volume and the total pore signal quantity.
Further, the core compression coefficient calculation formula is:
wherein: c (C) p : rock pore compression coefficient, MPa -1 ；ΔV p : pore volume change value, m 3 ；V p : pore volume, m 3 ；Δ p The pressure variation is MPa.
Further, the number of the standard samples is not less than 4, wherein at least one standard sample, preferably 6 samples, are present in the range of 0-5% porosity, 5-10% porosity, 10-20% porosity.
The invention has the technical effects that:
the invention aims to provide a novel method for determining the core pore compression coefficient based on nuclear magnetic resonance technology, which does not need to consider the influence of the change of the skeleton volume in the process of increasing the net pressure of a core, is accurate in measurement, subtracts the artificial operation error generated by a conventional test method, overcomes the defects of the prior art, provides important parameters for the mass balance calculation and well testing explanation work of oil and gas reservoir engineering, and has important practical significance.
Drawings
The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the inventive embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.
FIG. 1 shows a schematic flow diagram of the present invention;
fig. 2 shows a schematic diagram of the steps of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Embodiment 1, method for determining core pore compression coefficient based on nuclear magnetic resonance technology
(1) Selecting a core of a south-margin high-temperature ultrahigh-pressure tight gas reservoir 6993m 3, cleaning and drying the core to measure the length of the core to be 5.159cm and the diameter of the core to be 2.499cm, and taking out the field formation water or configuring simulated formation water in a laboratory according to formation water data;
(2) Placing the rock core into a high-pressure-resistant intermediate container, vacuumizing the rock core for 12 hours, injecting formation water, pressurizing to 30MPa, and standing for 24 hours to fully saturate the rock core with the formation water;
(3) Selecting a plurality of standard samples with different porosities, and determining T of each corresponding standard sample 2 Spectrogram according to T 2 Carrying out numerical inversion on the acquired attenuation data by adopting an SIRT method, accumulating to obtain the total pore signal of the standard sample, drawing a relation diagram of the pore volume and the total pore signal, and fitting to obtain a change relation line between the pore volume and the total pore signal;
(4) Placing the saturated stratum water core into a holder matched with a nuclear magnetic resonance apparatus to sweep an initial rock sample by T 2 Spectrogram, obtain core number 3T of (2) 2 Spectrogram, record corresponding volume signal value S at this time 1 Determining a signal value S from a pore volume and signal total amount correlation line determined from a standard sample 1 Corresponding core pore volume V 1 ＝2.79cm 3 ；
(5) Injecting fluorine oil (normal pressure in the core) into the cavity of the holder, continuously increasing confining pressure, increasing pressure by 4Mpa, and sweeping the core by T 2 Map, read out corresponding volume signal value S 2 The corresponding pore volume V is likewise determined 2 ＝2.73cm 3 Based on the formulaDetermination of the compression coefficient C of the core under this stress f1 ＝5.38×10 -3 Mpa-1
(6) The confining pressure is increased again, the pressure is increased by 4Mpa, and the rock core is swept by T at the moment 2 Map, read out corresponding volume signal value S 3 Determining the corresponding pore volume V 3 ＝2.69cm 3 From the formulaCalculated to obtain C f2 ＝3.58×10 -3 Mpa -1
(7) Repeating the step (6) to determine the corresponding pore volume V 4 ＝2.66cm 3 ,C f4 ＝2.69×10 -3 Mpa -1 The confining pressure is continuously increased until the confining pressure is increased to the net stress value of the stratum.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The method for determining the core pore compression coefficient based on the nuclear magnetic resonance technology is characterized by comprising the following steps of:
fully saturating stratum water by the rock core, measuring the rock porosity by scanning the nuclear magnetic resonance T2 map of the rock core, recording a corresponding volume signal value of the porosity, and determining the pore volume of the rock core;
and determining the compression coefficient of the core based on the core compression coefficient calculation formula.
2. The method according to claim 1, characterized in that the method comprises the specific steps of:
measuring basic parameters of the rock core;
placing the rock core into a high-pressure-resistant intermediate container, vacuumizing the rock core for 12 hours, injecting stratum water, pressurizing to 30MPa, and standing for 24 hours to fully saturate the rock core with the stratum water;
the saturated stratum water core is put into a clamp holder matched with a nuclear magnetic resonance apparatus, an initial rock sample is scanned by a T2 spectrogram, and a corresponding volume signal value S at the moment is recorded 1 Determining the signal value S from the line of variation of the pore volume and the total signal 1 Corresponding core pore volume V 1 ；
Injecting fluorine oil into the cavity of the holder, continuously increasing confining pressure, sweeping the rock core by a T2 map, and reading out a corresponding volume signal value S 2 The corresponding pore volume V is likewise determined 2 Until the confining pressure is increased to the net stress value of the stratum;
and determining the compression coefficients of the core under different stresses based on a core compression coefficient calculation formula.
3. The method of claim 2, wherein the core base parameters comprise: length L, diameter d.
4. The method according to claim 2, wherein the line of variation relationship between the pore volume and the total signal is obtained by:
selecting a plurality of standard samples with different porosities, measuring a T2 spectrogram of each corresponding standard sample, carrying out numerical inversion on the acquired attenuation data by adopting an SIRT method according to a T2 spectrogram attenuation curve, obtaining the total pore signal quantity of the standard samples through accumulation, drawing a relation diagram of the total pore volume and the total pore signal quantity, and fitting to obtain a change relation line between the pore volume and the total pore signal quantity.
5. The method according to claim 1 or 2, wherein the core compression coefficient calculation formula is:
wherein: cp is the rock pore compression coefficient; deltaV p Is the pore volume change value; v (V) p Is the pore volume; delta p Is the amount of pressure change.
6. The method of claim 4, wherein the number of standards is not less than 4, wherein at least one standard is present in each of the range of 0-5% porosity, 5-10% porosity, 10-20% porosity.
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| CN202310348290.8A CN116448643A (en) | 2023-04-04 | 2023-04-04 | Method for determining core pore compression coefficient based on nuclear magnetic resonance technology |
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| CN202310348290.8A CN116448643A (en) | 2023-04-04 | 2023-04-04 | Method for determining core pore compression coefficient based on nuclear magnetic resonance technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117929238A (en) * | 2024-03-19 | 2024-04-26 | 西南石油大学 | Method for testing pore volume compression coefficient of hypotonic rock based on gaseous medium |
Citations (4)
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|---|---|---|---|---|
| CN105004747A (en) * | 2015-07-13 | 2015-10-28 | 中国地质大学（北京） | Method for nuclear magnetic resonance measurement of coal core average pore compression coefficient |
| CN111912756A (en) * | 2019-05-07 | 2020-11-10 | 中国石油天然气股份有限公司 | Measuring device and measuring method for core pore compression coefficient |
| CN112505085A (en) * | 2021-02-05 | 2021-03-16 | 西南石油大学 | Method for measuring porosity effective stress coefficient based on nuclear magnetic resonance |
| US20220291157A1 (en) * | 2021-03-11 | 2022-09-15 | China University Of Geosciences (Beijing) | Method for establishing mathematical model of relationship between spontaneous imbibition volume and time of porous medium |
-
2023
- 2023-04-04 CN CN202310348290.8A patent/CN116448643A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004747A (en) * | 2015-07-13 | 2015-10-28 | 中国地质大学（北京） | Method for nuclear magnetic resonance measurement of coal core average pore compression coefficient |
| CN111912756A (en) * | 2019-05-07 | 2020-11-10 | 中国石油天然气股份有限公司 | Measuring device and measuring method for core pore compression coefficient |
| CN112505085A (en) * | 2021-02-05 | 2021-03-16 | 西南石油大学 | Method for measuring porosity effective stress coefficient based on nuclear magnetic resonance |
| US20220291157A1 (en) * | 2021-03-11 | 2022-09-15 | China University Of Geosciences (Beijing) | Method for establishing mathematical model of relationship between spontaneous imbibition volume and time of porous medium |
Non-Patent Citations (2)
| Title |
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| 王厉强;李正科;申红;罗阳俊;唐喜鸣;张中劲;文静;: "实测岩石孔隙压缩系数偏高原因再分析――与李传亮教授商榷", 新疆石油地质, no. 01, pages 102 - 103 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117929238A (en) * | 2024-03-19 | 2024-04-26 | 西南石油大学 | Method for testing pore volume compression coefficient of hypotonic rock based on gaseous medium |
| CN117929238B (en) * | 2024-03-19 | 2024-05-28 | 西南石油大学 | Method for testing pore volume compression coefficient of hypotonic rock based on gaseous medium |
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