CN113607622B - Experimental device and method for testing turbulence influence in water flooding process through double pipes - Google Patents
Experimental device and method for testing turbulence influence in water flooding process through double pipes Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 239000003921 oil Substances 0.000 claims abstract description 28
- 239000010779 crude oil Substances 0.000 claims abstract description 24
- 238000002474 experimental method Methods 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 239000004809 Teflon Substances 0.000 claims abstract description 6
- 229920006362 Teflon® Polymers 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 33
- 239000011435 rock Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 20
- 239000008398 formation water Substances 0.000 claims description 7
- 230000033558 biomineral tissue development Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000018109 developmental process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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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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Abstract
The invention discloses an experimental device and method for testing turbulence influence in a water flooding process by using double pipes. According to the invention, whether the water flooding process has turbulence or not is simulated by placing the permeable non-fluff paper towel and the impermeable Teflon sheet between core cutting blocks with different permeabilities, water flooding experiments are carried out on the turbulence displacing unit and the non-turbulence displacing unit under the same displacing condition, and the oil flooding efficiency is calculated respectively, so that the influence of the presence or absence of turbulence in the water flooding process on the improvement of the recovery ratio of crude oil is tested.
Description
Technical Field
The invention relates to an experimental device and method for testing turbulence influence in a water flooding process by using double pipes, and belongs to the technical field of oil-gas field development.
Background
A large number of indoor experiments and on-site oil reservoir exploitation results show that water injection can supplement stratum energy, and the method is an effective method for secondarily improving the crude oil recovery ratio. In a real geological reservoir, oil layers are more or less heterogeneous, when reservoirs are developed through water flooding, the water flooding front edge usually protrudes into the reservoir along a high-permeability layer to form a remarkable tongue-in phenomenon, and a large amount of residual oil remains in a low-permeability layer. How to control the water penetration into the high permeable layer is one of the important problems to be solved in the water flooding development process.
At present, the main solution adopted for the tongue phenomenon in the water flooding process is to add a water shutoff agent, so that the effects of blocking a high permeable layer and improving sweep efficiency are achieved, but the phenomenon of tongue is ignored because of the heterogeneity of a reservoir. The flow of water in heterogeneous reservoirs is often not laminar, and a phenomenon that interferes with the flow is created, as water flows along the high permeability layers and gradually migrates toward the high permeability channels even when it has previously entered a relatively low permeability reservoir.
For heterogeneous reservoirs, the disturbance flow of water during the water flooding process is an important cause of water to protrude along the high permeable layer, however, at present, an effective experimental device and method for testing the influence of the disturbance flow of water during the water flooding process on the improvement of the crude oil recovery rate have not been formed.
Disclosure of Invention
The invention aims to provide an experimental device and a method for testing the turbulence influence of a water flooding process by using double pipes, aiming at the defects of the existing experimental device and method for testing the turbulence influence of the water flooding process, which are provided in the technical background, so as to test the influence of the turbulence of the water flooding process on the improvement of recovery ratio of crude oil.
In order to achieve the above purpose, the present invention is realized by adopting the following technical scheme.
The experimental device for testing the turbulence influence of the water flooding process comprises a high-pressure displacement pump, a stratum crude oil container, a stratum water container, a vacuum pump, a turbulence displacement unit, a non-turbulence displacement unit and a constant temperature box, wherein the upper end and the lower end of the stratum crude oil container are respectively connected with a valve C and a valve D, the upper end and the lower end of the stratum water container are respectively connected with a valve A and a valve B, the valve B and the valve D are both connected with the high-pressure displacement pump, the valve A and the valve C are respectively connected with an a port and a port B of a four-way valve, the vacuum pump is connected with a port D of the four-way valve, a port C of the four-way valve is connected with a port g of the three-way valve, and ports e and f of the three-way valve are respectively connected with the turbulence displacement unit and the non-turbulence displacement unit;
the turbulent displacement unit comprises: first rock core holder, first enclose pump, first back pressure valve, first back pressure pump, first liquid collector, first gasometer, its characterized in that: the first confining pressure pump is connected with the first core holder, the first core holder is connected with the first back pressure valve, the first back pressure valve is respectively connected with the first back pressure pump and the first liquid collector, and the first liquid collector is connected with the first gas meter; the non-turbulent displacement unit comprises: the second rock core holder, the second enclose the pump, the second back pressure valve, the second back pressure pump, second liquid collector, second gasometer, its characterized in that: the second surrounding pressure pump is connected with the second core holder, the second core holder is connected with the second back pressure valve, the second back pressure valve is connected with the second back pressure pump and the second liquid collector respectively, and the second liquid collector is connected with the second gas meter.
A first inlet pressure gauge is arranged between the three-way valve and the first core holder; and a second inlet pressure gauge is arranged between the three-way valve and the second core holder.
A first outlet pressure gauge and a valve E are sequentially arranged between the first core holder and the first back pressure valve; and a second outlet pressure gauge and a valve F are sequentially arranged between the second core holder and the second back pressure valve.
The stratum crude oil container, the stratum water container, the first core holder and the second core holder are all arranged in the incubator.
An experimental method for testing turbulence influence in a water flooding process by using double pipes comprises the following steps:
firstly, selecting a homogeneous high-permeability core and a homogeneous low-permeability core with permeability ratio greater than 10, respectively cutting the homogeneous high-permeability core and the homogeneous low-permeability core into two halves along the axial center, reassembling the two cores with vertical non-uniformity by using high-permeability core cutting blocks in a mode of downwards arranging the upper low-permeability core cutting blocks, respectively placing permeable non-pile paper towels and impermeable Teflon sheets between the assembled two core cutting blocks, and then respectively loading the two core cutting blocks into a first core holder and a second core holder;
step two, preparing stratum water and stratum crude oil, and heating the incubator to a preset temperature;
vacuumizing the parallel rock samples, saturating stratum water, measuring pore volume, and calculating porosity;
step four, under the same temperature and pressure conditions, displacing formation water with formation crude oil at a constant speed, and correspondingly lifting confining pressure along with the rising of injection pressure until only oil and water cannot be discharged from the outlet ends of the two core holders, so as to establish initial oil and water saturation;
and fifthly, simultaneously displacing the parallel rock samples at a constant speed by using stratum water until only water and oil are not discharged from the outlet ends of the two core holders, and respectively calculating oil displacement efficiency.
In the second step, the mineralization degree of the formation water is the mineralization degree of the formation water of the oil reservoir where the core sample is located, and the gas-oil ratio of the formation crude oil is the gas-oil ratio of the oil reservoir where the core sample is located.
In the third step, when the rock sample is vacuumized, after the vacuum degree reaches 133Pa, the vacuum degree is continuously pumped for 2 to 5 hours to ensure that the rock sample is in a vacuum state, when stratum water is saturated, the stratum water is filled into the rock sample, and the constant pressure is 5MPa for 1 to 2 hours to ensure full saturation, and meanwhile, the confining pressure is correspondingly increased.
The invention has the following advantages:
(1) The experimental device provided by the invention has a simple structure, and the two parallel displacement units can independently perform displacement experiments, so that compared with a single-tube displacement device, the experimental device does not need to repeatedly disassemble and assemble a core holder in the experimental process, and the experimental time is greatly shortened.
(2) According to the invention, whether the water flooding process has turbulence or not is simulated by placing the permeable non-fluff paper towel and the impermeable Teflon sheet between core cutting blocks with different permeabilities, water flooding experiments are carried out on the turbulence displacing unit and the non-turbulence displacing unit under the same displacing condition, and the oil flooding efficiency is calculated respectively, so that the influence of the presence or absence of turbulence in the water flooding process on the improvement of the recovery ratio of crude oil is tested.
Drawings
FIG. 1 is a schematic structural diagram of an experimental device for testing the influence of turbulence in a water flooding process by using double pipes.
In the figure, the device comprises a 1-high-pressure displacement pump, a 2-stratum crude oil container, a 3-stratum water container, a 4-vacuum pump, a 5-turbulent displacement unit, a 6-non-turbulent displacement unit, a 7-constant temperature box, an 8-first core holder, a 9-second core holder, a 10-first surrounding pressure pump, an 11-second surrounding pressure pump, a 12-first back pressure valve, a 13-second back pressure valve, a 14-first liquid collector, a 15-second liquid collector, a 16-first gas meter, a 17-second gas meter, a 18-first back pressure pump, a 19-second back pressure pump, a 20-first inlet pressure meter, a 21-second inlet pressure meter, a 22-first outlet pressure meter, a 23-second outlet pressure meter, a 24-four-way valve, a 25-three-way valve, a 26-valve A, a 27-valve B, a 28-valve C, a 29-valve D, a 30-valve E, a 31-valve F, a 32-non-napped paper towel and 33-Teflon flakes.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
As shown in figure 1, an experimental device for testing the turbulence influence of a water flooding process comprises a high-pressure displacement pump 1, a stratum crude oil container 2, a stratum water container 3, a vacuum pump 4, a turbulence displacement unit 5, a non-turbulence displacement unit 6 and a constant temperature box 7, wherein the upper end and the lower end of the stratum crude oil container 2 are respectively connected with a valve C28 and a valve D29, the upper end and the lower end of the stratum water container 3 are respectively connected with a valve A26 and a valve B27, the valve B27 and the valve D29 are both connected with the high-pressure displacement pump 1, the valve A26 and the valve C28 are respectively connected with an a port and a B port of a four-way valve 24, the vacuum pump 4 is connected with a D port of the four-way valve 24, a C port of the four-way valve 24 is connected with a g port of a three-way valve 25, and e and f ports of the three-way valve 25 are respectively connected with the turbulence displacement unit 5 and the non-turbulence displacement unit 6; the turbulent displacement unit 5 comprises: the first core holder 8, the first confining pressure pump 10, the first back pressure valve 12, the first back pressure pump 18, the first liquid collector 14 and the first gas meter 16, wherein the first confining pressure pump 10 is connected with the first core holder 8, the first core holder 8 is connected with the first back pressure valve 12, the first back pressure valve 12 is respectively connected with the first back pressure pump 18 and the first liquid collector 14, and the first liquid collector 14 is connected with the first gas meter 16; the non-turbulent displacement unit 6 comprises: the second core holder 9, the second confining pressure pump 11, the second back pressure valve 13, the second back pressure pump 19, the second liquid collector 15 and the second gas meter 17, wherein the second confining pressure pump 11 is connected with the second core holder 9, the second core holder 9 is connected with the second back pressure valve 13, the second back pressure valve 13 is connected with the second back pressure pump 19 and the second liquid collector 15 respectively, and the second liquid collector 15 is connected with the second gas meter 17.
A first inlet pressure gauge 20 is arranged between the three-way valve 25 and the first core holder 8; a second inlet pressure gauge 21 is arranged between the three-way valve 25 and the second core holder 9.
A first outlet pressure gauge 22 and a valve E30 are sequentially arranged between the first core holder 8 and the first back pressure valve 12; a second outlet pressure gauge 23 and a valve F31 are sequentially arranged between the second core holder 9 and the second back pressure valve 13.
The stratum crude oil container 2, the stratum water container 3, the first core holder 8 and the second core holder 9 are all arranged in the incubator 7.
The experimental method for testing the influence of turbulence in the water flooding process by using the double pipes is characterized by comprising the following steps of:
firstly, selecting a homogeneous high-permeability core and a homogeneous low-permeability core with permeability ratio greater than 10, respectively cutting the homogeneous high-permeability core and the homogeneous low-permeability core into two halves along the axial center, reassembling the two cores with vertical non-uniformity by using high-permeability core cutting blocks in a mode of downwards arranging the upper low-permeability core cutting blocks, respectively placing permeable non-pile paper towels and impermeable Teflon sheets between the assembled two core cutting blocks, and then respectively loading the two core cutting blocks into a first core holder and a second core holder;
step two, preparing stratum water and stratum crude oil, heating the incubator 7 to a preset temperature, wherein the mineralization degree of the stratum water is the mineralization degree of the stratum water of the oil reservoir where the core sample is located, and the gas-oil ratio of the stratum crude oil is the gas-oil ratio of the oil reservoir where the core sample is located;
step three, connecting d and c ports of the four-way valve 24, connecting g, E and F ports of the three-way valve 25, closing the valve E30 and the valve F31, and vacuumizing the parallel rock samples; then connecting ports a and c of the four-way valve 24 and ports g, E and F of the three-way valve 25, opening the valve A26, the valve B27, the valve E30 and the valve F31, saturating formation water, measuring pore volume and calculating porosity;
step four, connecting ports b and C of the four-way valve 24, connecting ports g, E and F of the three-way valve 25, opening a valve C28, a valve D29, a valve E30 and a valve F31, displacing formation water with formation crude oil at a constant speed under the same temperature and pressure conditions, and correspondingly lifting confining pressure along with rising of injection pressure until only oil is discharged from outlet ends of two core holders and water saturation is established;
and fifthly, connecting ports a and c of the four-way valve 24 and ports g, E and F of the three-way valve 25, opening the valve A26, the valve B27, the valve E30 and the valve F31, simultaneously displacing the parallel rock samples with formation water at a constant speed until only water and oil are not discharged from the outlet ends of the two core holders, and respectively calculating oil displacement efficiency.
And thirdly, when the rock sample is vacuumized, continuously pumping for 2-5 hours after the vacuum degree reaches 133Pa to ensure that the rock sample is in a vacuum state, filling stratum water into the rock sample when the stratum water is saturated, and keeping the constant pressure for 1-2 hours at 5MPa to ensure full saturation, and simultaneously correspondingly lifting the confining pressure.
The foregoing description is only for the purpose of illustrating the embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the technical scope of the present invention disclosed in the embodiments of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides an experimental apparatus of double-barrelled test water drives process vortex influence, includes high pressure displacement pump (1), stratum crude oil container (2), stratum water container (3), vacuum pump (4), vortex displacement unit (5), non-vortex displacement unit (6), thermostated container (7), its characterized in that: the upper end and the lower end of the stratum crude oil container (2) are respectively connected with a valve C (28) and a valve D (29), the upper end and the lower end of the stratum water container (3) are respectively connected with a valve A (26) and a valve B (27), the valve B (27) and the valve D (29) are both connected with the high-pressure displacement pump (1), the valve A (26) and the valve C (28) are respectively connected with an a port and a B port of the four-way valve (24), the vacuum pump (4) is connected with a D port of the four-way valve (24), a C port of the four-way valve (24) is connected with a g port of the three-way valve (25), and an e port and an f port of the three-way valve (25) are respectively connected with the turbulent displacement unit (5) and the non-turbulent displacement unit (6);
the turbulent displacement unit (5) comprises: first rock core holder (8), first surrounding pressure pump (10), first back pressure valve (12), first back pressure pump (18), first liquid collector (14), first gasometer (16), its characterized in that: the first confining pressure pump (10) is connected with the first core holder (8), the first core holder (8) is connected with the first back pressure valve (12), the first back pressure valve (12) is respectively connected with the first back pressure pump (18) and the first liquid collector (14), and the first liquid collector (14) is connected with the first gas meter (16); the non-turbulent displacement unit (6) comprises: the second rock core holder (9), second enclose pump (11), second back pressure valve (13), second back pressure pump (19), second liquid collector (15), second gasometer (17), its characterized in that: the second surrounding pressure pump (11) is connected with the second core holder (9), the second core holder (9) is connected with the second back pressure valve (13), the second back pressure valve (13) is connected with the second back pressure pump (19) and the second liquid collector (15) respectively, and the second liquid collector (15) is connected with the second gas meter (17).
2. The experimental device for testing the turbulence effect of a water flooding process by using a double pipe according to claim 1, wherein: a first inlet pressure gauge (20) is arranged between the three-way valve (25) and the first core holder (8); a second inlet pressure gauge (21) is arranged between the three-way valve (25) and the second core holder (9).
3. The experimental device for testing the turbulence effect of a water flooding process by using a double pipe according to claim 1, wherein: a first outlet pressure gauge (22) and a valve E (30) are sequentially arranged between the first core holder (8) and the first back pressure valve (12); a second outlet pressure gauge (23) and a valve F (31) are sequentially arranged between the second core holder (9) and the second back pressure valve (13).
4. The experimental device for testing the turbulence effect of a water flooding process by using a double pipe according to claim 1, wherein: stratum crude oil container (2), stratum water container (3), first rock core holder (8), second rock core holder (9) all set up in incubator (7).
5. The experimental method for testing the influence of turbulence in the water flooding process by using the double pipes is characterized by comprising the following steps of:
firstly, selecting a homogeneous high-permeability core and a homogeneous low-permeability core with permeability ratio greater than 10, respectively cutting the homogeneous high-permeability core and the homogeneous low-permeability core into two halves along the axial center, reassembling the two cores with vertical non-uniformity by using high-permeability core cutting blocks in a mode of downwards arranging the upper low-permeability core cutting blocks, respectively placing permeable non-pile paper towels and impermeable Teflon sheets between the assembled two core cutting blocks, and then respectively loading the two core cutting blocks into a first core holder and a second core holder;
step two, preparing stratum water and stratum crude oil, and heating the incubator to a preset temperature;
vacuumizing the parallel rock samples, saturating stratum water, measuring pore volume, and calculating porosity;
step four, under the same temperature and pressure conditions, displacing formation water with formation crude oil at a constant speed, and correspondingly lifting confining pressure along with the rising of injection pressure until only oil and water cannot be discharged from the outlet ends of the two core holders, so as to establish initial oil and water saturation;
and fifthly, simultaneously displacing the parallel rock samples at a constant speed by using stratum water until only water and oil are not discharged from the outlet ends of the two core holders, and respectively calculating oil displacement efficiency.
6. The experimental method for testing the turbulence effect of a water flooding process by using the double pipes according to claim 5, wherein the experimental method is characterized by comprising the following steps: and in the second step, the mineralization degree of the stratum water is the mineralization degree of the stratum water of the oil reservoir where the core sample is located, and the gas-oil ratio of the stratum crude oil is the gas-oil ratio of the oil reservoir where the core sample is located.
7. The experimental method for testing the turbulence effect of a water flooding process by using the double pipes according to claim 5, wherein the experimental method is characterized by comprising the following steps: and thirdly, when the rock sample is vacuumized, continuously pumping for 2-5 hours after the vacuum degree reaches 133Pa to ensure that the rock sample is in a vacuum state, filling stratum water into the rock sample when the stratum water is saturated, and keeping the constant pressure for 1-2 hours at 5MPa to ensure full saturation, and simultaneously correspondingly lifting the confining pressure.
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| CN116241247B (en) * | 2023-03-14 | 2023-12-12 | 西南石油大学 | Experimental device and method for simulating multi-well collaborative multi-cycle driving-swallowing coupling |
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| CN113062722A (en) * | 2021-03-19 | 2021-07-02 | 西南石油大学 | Long core water-gas stable alternation and accurate volume oil displacement experimental method |
| CN115949382A (en) * | 2022-10-10 | 2023-04-11 | 西南石油大学 | Experimental device and method for testing turbulence influence in water flooding process through double pipes |
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