CN202814845U - Three-phase Relative Permeability Test System Based on CT Scanning - Google Patents
Three-phase Relative Permeability Test System Based on CT Scanning Download PDFInfo
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- CN202814845U CN202814845U CN 201220385055 CN201220385055U CN202814845U CN 202814845 U CN202814845 U CN 202814845U CN 201220385055 CN201220385055 CN 201220385055 CN 201220385055 U CN201220385055 U CN 201220385055U CN 202814845 U CN202814845 U CN 202814845U
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- Prior art keywords
- relative permeability
- holding unit
- phase relative
- scan
- permeability test
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 230000035699 permeability Effects 0.000 title claims abstract description 27
- 238000002591 computed tomography Methods 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 5
- 229920002530 polyetherether ketone Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical group OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims 1
- 239000011435 rock Substances 0.000 abstract description 26
- 238000000034 method Methods 0.000 abstract description 18
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
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Abstract
The utility model provides a three-phase relative permeability test system based on CT scanning, it includes: the device comprises a CT scanner, a rock core holder, a confining pressure system, an injection system and a back pressure control system; the injection system comprises an oil injection system, a water injection system and a gas injection system which are respectively connected with the inlet end of the core holder; an inlet pressure gauge is arranged at the inlet of the core holder, and an outlet pressure gauge is arranged at the outlet of the core holder; the confining pressure interface of the core holder is connected with the confining pressure system; the outlet end of the core holder is connected with a back pressure control system. The test system carries out CT scanning on the whole three-phase displacement process, acquires inlet and outlet pressures in the whole process, obtains whole-process fluid saturation data, and has the advantages of visual and accurate result, simple structure and convenient operation.
Description
Technical field
The utility model relates to a kind of rock core reservoir physical simulation test unit, is specifically related to a kind of three-phase relative permeability test macro based on CT scan.
Background technology
The recent innovation of field of petroleum exploitation makes the research of three-phase relative permeability cause people's concern, under mining conditions such as carbon dioxide injection, combustion (of oil) in site, steam flood, injecting glue bundle and notes nitrogen, the dynamic in detail engineering calculation of oil reservoir needs the three-phase relative permeability data.
Mathematical model method is adopted in the calculating of the at present relative infiltration of three-phase more, namely according to the data of two-phase relative permeability, calculates three-phase relative permeability by Stone probability model I or II.The method is simple fast, but can only calculate a kind of data of saturated course, and limiting factor is many, and the degree of agreement of actual result is not fine.Adopt the method test three-phase relative permeability of laboratory physical simulation, the recovery process under the energy real simulation reservoir condition, data result is more accurately and reliably.
Utilize laboratory physical Modeling Method test three-phase relative permeability curve, crucial technology is the accurate measurement of three-phase saturation.Method commonly used comprises volumetric method at present, microwave weight method etc., but because the restriction of all factors, the test process complexity is loaded down with trivial details, and test result is very inaccurate, and these all directly have influence on the test result of three-phase relative permeability curve.
The CT scan technology has obtained widely research aspect reservoir physics, comprise that the nonuniformity of core description, rock core is measured, the core sample handling procedure is determined, the aspects such as the measurement of crack quantitative test, online saturation degree, flowing experiment research.For the test of three-phase fluid saturation degree, can adopt the dual energy scanning technique accurate measurement based on CT.Namely the CT scan rock core can obtain under the E1 energy:
CT
E1dry=(1-Φ)CT
E1grain+ΦCT
E1g (1)
CT
E1waterwet=(1-Φ)CT
E1grain+ΦCT
E1w (2)
CT
E1=(1-Φ)CT
E1grain+Φ(S
gCT
E1g+S
wCT
E1w+S
oCT
E1o)(3)
Wherein,
CT
E1dryThe CT value of dried rock core under the-E1 energy;
CT
E1grainThe CT value of rock skeleton under the-E1 energy;
CT
E1waterwetThe rock CT value of complete saturation water under the-E1 energy;
CT
E1The CT value of certain moment rock core under the-E1 energy;
CT
E1gThe CT value of gas under the-E1 energy;
CT
E1wThe CT value of water under the-E1 energy;
CT
E1oThe CT value of oil under the-E1 energy;
The factor of porosity of Φ-rock;
S
gThe saturation degree of-gas;
S
w-water saturation degree;
S
oThe saturation degree of-oil.
The CT scan rock core can obtain under the E2 energy:
CT
E2dry=(1-Φ)CT
E2grain+ΦCT
E2g (4)
CT
E2waterwet=(1-Φ)CT
E2grain+ΦCT
E2w (5)
CT
E2=(1-Φ)CT
E2grain+Φ(S
gCT
E2g+S
wCT
E2w+S
oCT
E2o)(6)
Wherein,
CT
E2dryThe CT value of dried rock core under the-E2 energy;
CT
E2grainThe CT value of rock skeleton under the-E2 energy;
CT
E2waterwetThe rock CT value of complete saturation water under the-E2 energy;
CT
E2The CT value of certain moment rock core under the-E2 energy;
CT
E2gThe CT value of gas under the-E2 energy;
CT
E2wThe CT value of water under the-E2 energy;
CT
E2oThe CT value of oil under the-E2 energy;
In addition,
S
g+S
w+S
o=1(7)
According to formula (1)~(7), the computing formula that can calculate the three-phase fluid saturation degree is:
Use the CT dual energy scanning technique, measure dried rock core under two kinds of energy of E1, E2, rock core skeleton, saturation water rock core and certain CT value constantly, and the CT value of the identical energy therapeutic method to keep the adverse qi flowing downward, water, oil, but both application of formula (8) drew three-phase saturation and the permeability of a certain moment rock core.
Yet, not yet there is a complete test macro to finish measurement and the collection of above-mentioned data at present, therefore, need a kind of three-phase relative permeability test macro based on CT scan of exploitation badly.
The utility model content
For the above-mentioned problems in the prior art, the utility model provides a kind of three-phase relative permeability test macro based on CT scan.
For realizing the purpose of this utility model, the utility model comprises following technical scheme:
A kind of three-phase relative permeability test macro based on CT scan, it comprises: CT scanner, core holding unit, confined pressure system, injected system and back pressure control system;
This injected system comprises injection system, waterflood system and the gas injection system that is connected with the core holding unit inlet end respectively;
These core holding unit 6 porch inlet porting tensimeters 7, its exit arranges delivery gauge 4;
The confined pressure interface of core holding unit 6 connects this confined pressure system;
The endpiece of core holding unit 6 connects the back pressure control system.
Aforesaid system, wherein, this core holding unit is the core holding unit that is applied to CT scan, is made by the material that does not shield X ray, preferably, it is polyether-ether-ketone resin (PEEK) material core holding unit, the highest withstand voltage 30MPa, 150 ° of C of high-temperature resistant.
Aforesaid system, wherein, this injection system can comprise oil pump 8 and oil vessel 9.
Aforesaid system, wherein, this waterflood system can comprise water pump 16 and tank 17.
Aforesaid system, wherein, this gas injection system can comprise water storage device 15, gas injection pump 14 and middle air container 13.
Aforesaid system, preferably, these core holding unit 6 inlet ends are communicated with respectively injection system, waterflood system and gas injection system by three-position four-way valve.
Aforesaid system, wherein, this confined pressure system can comprise confined pressure liquid container 11 and confined pressure pump 12.
Aforesaid system, wherein, this back pressure control system can comprise backpressure pump 3 and check valve 2, core holding unit 6 endpiece are communicated with respectively backpressure pump 3 and go out oral fluid collection container 10 by check valve 2.
The beneficial effects of the utility model are that this test macro carries out CT scan to three-phase displacement overall process, and overall process gathers import and export pressure, obtains omnidistance saturated with fluid degrees of data, visual result, accurate, simple in structure, convenient operation.
Description of drawings
Fig. 1 is that embodiment 1 is based on the structural representation of the three-phase relative permeability test macro of CT scan.
Embodiment
Embodiment 1: based on the three-phase relative permeability test macro of CT scan.
Please refer to Fig. 1, the test macro of a kind of preferred implementation of the present utility model comprises CT scanner 1, core holding unit 6, confined pressure system, injected system and back pressure control system.Core holding unit 6 is made by polyether-ether-ketone resin (PEEK) material, the highest withstand voltage 30MPa, 150 ° of C of high-temperature resistant.Core holding unit 6 porch inlet porting tensimeters 7, the exit arranges delivery gauge 4.Core holding unit 6 inlet ends connect injected system, and injected system is comprised of injection system, waterflood system and gas injection system.Injection system comprises oil pump 8 and oil vessel 9, and waterflood system comprises water pump 16 and tank 17, and gas injection system comprises water storage device 15, gas injection pump 14 and middle air container 13.Core holding unit 6 inlet ends are communicated with respectively the gas outlet of oil pump 8 output terminals, water pump 16 output terminals and middle air container 13 by three-position four-way valve.The confined pressure interface of core holding unit 6 connects this confined pressure system, and the confined pressure system is by confined pressure liquid container 11 and confined pressure pump 12.The endpiece of core holding unit 6 connects the back pressure control system, and the back pressure control system comprises backpressure pump 3 and check valve 2, and core holding unit 6 endpiece are communicated with respectively backpressure pump 3 and go out oral fluid collection container 10 by check valve 2.Core holding unit 6 in-built tamping are tested rock core 5.Core holding unit 6 is fixed on the support with moving track, can prolong track and enter CT scanner 1 inside and finish CT scan.
Embodiment 2: use the device of embodiment 1 to carry out the three-phase relative permeability test experiments.Concrete steps are as follows:
1) during rock core is packed core holding unit into, adds confined pressure;
2) respectively dried core sample is scanned under two kinds of scanning voltages, writing scan position and the condition of scanning obtain the CT value of dried rock core under two kinds of energy;
3) rock core 100% is found time, behind the saturated brine, with step 2) under identical two kinds of scanning voltages, the condition of scanning and the scanning positions, rock core is scanned, obtain under two kinds of energy the fully rock core CT value of saturated brine;
4) in the displacement test process, with step 2) under identical two kinds of scanning voltages, the condition of scanning and the scanning positions, rock core is scanned, obtain the CT value of rock core under this moment two kinds of energy;
5) with step 2) under identical two kinds of scanning voltages to air, experiment with salt solution, experiment with oily and test usefulness gas and scan, obtain the CT value of this medium under two kinds of energy;
6) calculate the three-phase fluid saturation degree according to formula (8).
It will be appreciated by those skilled in the art that accompanying drawing is the synoptic diagram of a preferred embodiment, the utility model is not limited to this.
It will be appreciated by those skilled in the art that each parts among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.Above-mentioned the utility model embodiment sequence number does not represent the quality of embodiment just to description.
Used specific embodiment in the utility model principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (8)
1. the three-phase relative permeability test macro based on CT scan is characterized in that, described three-phase relative permeability test macro based on CT scan comprises: CT scanner, core holding unit, confined pressure system, injected system and back pressure control system;
Described injected system comprises injection system, waterflood system and the gas injection system that is connected with core holding unit (6) inlet end respectively;
Described core holding unit (6) porch inlet porting tensimeter (7), its exit arrange delivery gauge (4);
The confined pressure interface of core holding unit (6) connects described confined pressure system;
The endpiece of core holding unit (6) connects the back pressure control system.
2. the three-phase relative permeability test macro based on CT scan as claimed in claim 1 is characterized in that, described core holding unit is PEEK material core holding unit, the highest withstand voltage 30MPa, 150 ° of C of high-temperature resistant.
3. the three-phase relative permeability test macro based on CT scan as claimed in claim 1 is characterized in that, described injection system comprises oil pump (8) and oil vessel (9).
4. the three-phase relative permeability test macro based on CT scan as claimed in claim 1 is characterized in that, described waterflood system comprises water pump (16) and tank (17).
5. the three-phase relative permeability test macro based on CT scan as claimed in claim 1 is characterized in that, described gas injection system comprises water storage device (15), gas injection pump (14) and middle air container (13).
6. the three-phase relative permeability test macro based on CT scan as claimed in claim 1 is characterized in that, described core holding unit (6) inlet end is communicated with respectively injection system, waterflood system and gas injection system by three-position four-way valve.
7. the three-phase relative permeability test macro based on CT scan as claimed in claim 1 is characterized in that, described confined pressure system comprises confined pressure liquid container (11) and confined pressure pump (12).
8. the three-phase relative permeability test macro based on CT scan as claimed in claim 1, it is characterized in that, described back pressure control system comprises backpressure pump (3) and check valve (2), and check valve (2) connects respectively backpressure pump (3), core holding unit (6) endpiece and goes out oral fluid collection container (10).
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