US20230038432A1 - Enhanced oil recovery method using injection well including two passages - Google Patents
Enhanced oil recovery method using injection well including two passages Download PDFInfo
- Publication number
- US20230038432A1 US20230038432A1 US17/789,699 US202117789699A US2023038432A1 US 20230038432 A1 US20230038432 A1 US 20230038432A1 US 202117789699 A US202117789699 A US 202117789699A US 2023038432 A1 US2023038432 A1 US 2023038432A1
- Authority
- US
- United States
- Prior art keywords
- gas
- injection
- water
- passage
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007924 injection Substances 0.000 title claims abstract description 114
- 238000002347 injection Methods 0.000 title claims abstract description 114
- 238000011084 recovery Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 106
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 description 21
- 239000003345 natural gas Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000008398 formation water Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 230000009977 dual effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
Definitions
- the present invention relates to an enhanced oil recovery method using an injection well including two passages.
- CCS global carbon dioxide capture and storage technology
- CCUS carbon dioxide capture, utilization and storage technology
- the CCS is highly expected as a technology capable of significantly reducing carbon dioxide (hereinafter abbreviated as CO 2 gas in the present specification).
- CO 2 gas carbon dioxide
- the worldwide dissemination has not progressed as expected.
- the CCUS which aims not only to store recovered CO 2 gas, but also to produce value-added products by directly or indirectly using CO 2 gas to compensate for the cost of recovery, is gaining attention.
- EOR enhanced oil recovery
- Patent Document 1 is characterized in that the CO 2 gas stored in the CO 2 gas tank is boosted by a pumping device, and the CO 2 gas is micro-bubbled by injecting it from an injection well drilled vertically to the formation, and the CO 2 gas is stored underground by dispersing the microbubbles in the formation water.
- a storage device and a storage method are proposed.
- Patent Document 2 is characterized in that CO 2 gas is injected underground by a pumping device from an injection well drilled horizontally in the formation, the CO 2 gas is made into microbubbles, and the microbubbles are dispersed in the formation water to store the CO 2 gas underground.
- a storage device and a storage method have been proposed.
- Patent Document 3 is characterized in that the injected gas is micro-bubbled on the ground surface and mixed with the injection water to create a gas-liquid mixed fluid, which is injected into the oil layer or the gas layer from the injection well to fine gaps in the layer.
- Patent Document 1 and Patent Document 2 a filter is provided at the tip or the lower side of the injection well for pumping a stored material containing CO 2 gas.
- Patent Document 1 and Patent Document 2 when mixing the pumped fluid as a gas-liquid mixture fluid, fine suspended solids in the liquid can clog the filter.
- Patent Document 3 installs a micro-bubble generator in the upper portion of an oil well (inside a well near the ground surface at a depth of 5 m to 50 m).
- Patent Document 3 in the process of transporting micro-bubbles to the underground reservoir layer that exists several thousand meters underground, the leakage of micro-bubble water from a joint in the tubing or casing is unavoidable, and the change in formation temperature and pressure induces changes in the properties of the micro-bubble water, such that there is a risk that the replacement of oil and gas with micro-bubble water will not proceed as initially assumed.
- the inventors have found that the injection gas and the injection water are separately injected into the injection well by using an injection well including two passages, and the injection gas is passed through a micro-bubble generator installed at the lower end of the gas passage to efficiently generate the micro-bubbles and to efficiently penetrate the micro-bubbles into the gaps of the underground oil reservoir.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for enhanced recovery of oil contained in an underground oil reservoir by using micro-bubbles.
- the present invention employs the following aspects.
- An enhanced oil recovery method is an enhanced oil recovery method for enhanced recovery of oil contained in an underground oil reservoir by using an injection well including two passages of a water passage and a gas passage, the enhanced oil recovery method including a step of injecting injection water from the water passage, a step of injecting an injection gas from the gas passage and spraying the injection gas as a fine gas bubble flow through a micro-bubble generator which is installed at a lower end of the gas passage, and a step of penetrate into the underground oil reservoir a gas-liquid mixture fluid containing micro-bubbles generated by mixing the injection water and the fine gas bubble flow in the injection well.
- the water passage may be a water injection pipe
- the gas passage may be a gas injection pipe
- the gas passage may be arranged inside the water passage, and the injection water may be injected between an inside of the water passage and an outside of the gas passage.
- the water passage may be arranged inside the gas passage, and the injection gas may be injected between an inside of the gas passage and an outside of the water passage.
- the micro-bubble generator may be installed at a depth where the underground oil reservoir is located.
- FIG. 1 is a schematic view for explaining an enhanced oil recovery method according to the first embodiment of the present invention.
- FIG. 2 is a schematic view for explaining an enhanced oil recovery method according to the second embodiment of the present invention.
- FIG. 3 is a schematic view for explaining an enhanced oil recovery method according to the third embodiment of the present invention.
- FIG. 4 is a schematic view showing an example of a micro-bubble generator.
- FIG. 1 is a schematic view for explaining an enhanced oil recovery method according to the present embodiment.
- the recovery of oil contained in an underground oil reservoir 212 is enhanced by using an injection well 101 including two passages of a water passage 104 and a gas passage 105 .
- the enhanced oil recovery method according to the present embodiment includes a step of injecting injection water 102 from the water passage (water injection pipe) 104 , a step of injecting an injection gas 103 from the gas passage (gas injection pipe) 105 and spraying the injection gas 103 as a fine gas bubble flow through a micro-bubble generator 210 installed at a lower end of the gas passage 105 , and a step of penetrate a gas-liquid mixture fluid containing micro-bubbles by mixing the injection water 102 and a fine gas bubble flow generated from the micro-bubble generator 210 in the injection well 101 into the underground oil reservoir 212 .
- the injection well 101 is including two passages of the water passage 104 and the gas passage 105 .
- the injection water 102 is injected from the water passage 104 on the ground surface 211 side.
- River water and sea water are used as the injection water 102 , but the formation water and injection water produced from a production well may also be reused by mixing them with river water and sea water.
- a chemical agent is added before the injection so as not to cause blockage of the fine gaps due to formation swelling by the injection water.
- the injection gas 103 is injected from the gas passage 105 on the ground surface 211 side.
- the injection gas 103 is hydrocarbon gas, flare gas, nitrogen gas, CO 2 gas, exhaust gas, or a gas that is a mixture of these.
- CO 2 gas or exhaust gas is used as the injection gas 103 , CO 2 gas can be stored underground, which is effective in combating global warming.
- the water passage 104 and the gas passage 105 are arranged in parallel in the injection well 101 . That is, the injection gas 103 and the injection water 102 are separately injected into the injection well 101 .
- a pipe 202 a constitutes two passages with two pipes, i.e., the water passage (water injection pipe) 104 and the gas passage (gas injection pipe) 105 .
- the micro-bubble generator 210 whose central material is a filter, which is a porous member, is installed at the lower end of the gas passage 105 .
- the micro-bubble generator 210 is installed at the depth at which the underground oil reservoir 212 is located.
- a shape of the filter has a cylindrical shape.
- the shape of the filter is a hollow coaxial cylindricality.
- the filter for example, a member obtained by mixing and sintering ceramic particles and a binder for binding the particles, or a stainless steel sintered filter can be used.
- the filter pore size is small, micro-bubbles are likely to be generated, but the passage resistance of a fluid increases, the pumping device for increasing the flow rate of the injection gas 103 is increased in size.
- the filter pore size is increased, the passage resistance of the fluid decreases, but the efficiency of micro-bubbling generator is degraded, and further, it is not preferable that the injection water passes through the micro-bubble generator 210 , since there is a possibility that floating particle in the injection water may clog the filter.
- the micro-bubbles refer to bubbles with a diameter of less than 1 mm (including a supercritical state).
- the injection gas 103 and the injection water 102 are separately pumped into the well, the fine gas bubble flow is sprayed through the micro-bubble generator 210 , and the gas-liquid mixture fluid containing the micro-bubbles generated by mixing the injection water 102 and the fine gas bubble flow is penetrated into the gaps of the underground oil reservoir 212 , whereby oil, natural gas, and formation water can be discharged from the fine gaps of the underground oil reservoir 212 .
- the micro-bubble generator 210 may be installed at the depth at which the underground oil reservoir 212 at the lower end of the injection well 101 is located.
- the depth at which the underground oil reservoir 212 is located is a position corresponding to the depth of the underground oil reservoir 212 distributed on an outer periphery of the lower end of the injection well 101 .
- a packer 203 prevents the injection water 102 discharged from the lower end of the water passage 104 and the injection gas 103 discharged from the lower end of the gas passage 105 from flowing back to the ground surface.
- the water passage 104 may be a water injection pipe.
- the gas passage 105 may be a gas injection pipe.
- the injection gas 103 and the injection water 102 are separately injected into the injection well 101 by using the injection well 101 including two passages, and the micro-bubbles are efficiently generated by passing the micro-bubble generator 210 , and the gas is sprayed as a fine gas bubble flow.
- the gas-liquid mixture fluid containing the micro-bubbles generated by mixing with the injection water 102 in the well efficiently penetrate the underground oil reservoir 212 .
- the production rate of oil and natural gas from the production wells drilled at different points from the injection well 101 will increases.
- the recovery of the oil and natural gas contained in the underground oil reservoir 212 can be enhanced.
- the injection water and the injection gas moved from the injection well 101 to the production well together with the oil, the natural gas, and the formation water discharged from the fine gap by the micro-bubbles in the underground oil reservoir 212 are produced from the production well.
- a production fluid is produced through the inside of a tubing pipe among the devices that reuse the separated natural gas and injection gas, and formation water and injection water into the injection well.
- a three-phase gas-liquid separator for separating the production fluid with different specific gravity on the ground surface separates natural gas and injection gas, oil, and formation water and injection water, and the natural gas and the injection gas are transferred to an injection gas tank and reused as injection gas.
- the separated formation water and injection water are also transferred to the injection water tank and reused as injection water.
- a pipe used to produce oil and natural gas from the underground oil reservoir is called a tubing pipe, and the gas-liquid mixture fluid of oil, natural gas, injection gas, formation water, and injection water pass upward.
- the second embodiment is different from the first embodiment in that a gas passage 205 is arranged inside a water passage 204 , and the injection water 102 is injected between the inside of the water passage 204 and the outside of the gas passage 205 .
- FIG. 2 is a schematic view for explaining an enhanced oil recovery method according to the present embodiment.
- the gas passage (inner pipe) 205 is arranged inside the water passage (outer pipe) 204 . That is, the injection well 201 according to the present embodiment has a structure of a pipe 202 b that constitutes two passages with the dual channel pipe of the water passage (outer pipe) 204 and the gas passage (inner pipe) 205 .
- the injection water 102 is injected between the water passage 204 and the gas passage 205
- the injection gas 103 is injected into the gas passage 205
- the micro-bubble generator 210 is installed at the lower end of the gas passage 205 .
- the micro-bubbles are efficiently generated by passing through the micro-bubble generator 210 is installed at the lower end of the gas passage 205 , and the gas is sprayed as a fine gas bubble flow.
- the gas-liquid mixture fluid containing the micro-bubbles generated by mixing with the injection water 102 in the well efficiently penetrates the underground oil reservoir 212 .
- the production rate of oil and natural gas from the production wells drilled at different points from the injection well 201 will increases.
- the recovery of the oil contained in the underground oil reservoir 212 can be enhanced.
- the structure has the dual channel pipe as in the present embodiment, since it can be handled as a single pipe, the effect of reducing a work over cost and a down hole tools cost is expected.
- the third embodiment is different from the first embodiment in that the water passage 304 is arranged inside the gas passage 305 , and the injection gas 103 is injected between the inside of the gas passage 305 and the outside of the water passage 304 .
- FIG. 3 is a schematic view for explaining an enhanced oil recovery method according to the present embodiment.
- the water passage (inner pipe) 304 is arranged inside the gas passage 305 (outer pipe). That is, the injection well 301 according to the present embodiment has a structure of a pipe 202 c that constitutes two passages with the dual channel pipe of the gas passage (outer pipe) 305 and the water passage (inner pipe) 304 .
- the injection water 102 is injected into the water passage 304
- the injection gas 103 is injected between the inside of the gas passage 305 and the outside of the water passage 304
- the micro-bubble generator 210 is installed at the lower end of the gas passage 305 .
- the micro-bubbles are efficiently generated by passing through the micro-bubble generator 210 is installed at the lower end of the gas passage 305 , and the gas is sprayed as a fine gas bubble flow.
- the gas-liquid mixture fluid containing the micro-bubbles generated by mixing with the injection water 102 in the well efficiently penetrates the underground oil reservoir 212 .
- the production rate of oil and natural gas from the production wells drilled at different points from the injection well 301 will increases.
- the recovery of the oil contained in the underground oil reservoir 212 can be enhanced.
- the structure has the dual channel pipe as in the present embodiment, since it can be handled as a single pipe, the effect of reducing a work over cost and a down hole tools cost is expected.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The method enables enhanced recovery of oil contained in an underground oil reservoir by using an injection well including two passages of a water passage and a gas passage. The enhanced oil recovery method includes steps of injecting an injection water from the water passage, injecting an injection gas from the gas passage and spraying the injection gas as a fine gas bubble flow through a micro-bubble generator which is installed at a lower end of the gas passage, and penetrating into the underground oil reservoir a gas-liquid mixture fluid containing micro-bubbles generated by mixing the injection water and the fine gas bubble flow in the injection well.
Description
- The present invention relates to an enhanced oil recovery method using an injection well including two passages.
- Priority is claimed on Japanese Patent Application No. 2020-153491, filed Sep. 14, 2020, the content of which is incorporated herein by reference.
- A measure against global warming is an important problem for countries around the world to tackle with all their might. The introduction of a global carbon dioxide capture and storage technology (hereinafter abbreviated as “CCS” in the present specification) and a carbon dioxide capture, utilization and storage technology (hereinafter abbreviated as “CCUS” in the present specification) is required as an urgent response, as one of the measures against global warming.
- The CCS is highly expected as a technology capable of significantly reducing carbon dioxide (hereinafter abbreviated as CO2 gas in the present specification). However, the worldwide dissemination has not progressed as expected. There are several reasons for this, such as technological uncertainty, concerns about the safety of reservoirs, and underdeveloped laws and regulations, but it may be difficult to predict business feasibility, especially due to increased costs. Therefore, the CCUS, which aims not only to store recovered CO2 gas, but also to produce value-added products by directly or indirectly using CO2 gas to compensate for the cost of recovery, is gaining attention.
- Therefore, a technology to inject gas containing CO2 gas into an underground oil reservoir using enhanced oil recovery (hereinafter abbreviated as “EOR” in the present specification), which is one of the CCUS technologies, is a technically reliable technology. The EOR can be stored CO2 gas underground as a measure against global warming, and economic effect can be improved while increasing oil recovery rates. Therefore, the EOR has become an indispensable element in the spread of CCUS technology in each country.
- As a method of storing a large amount of CO2 gas underground, there is a method of injecting CO2 gas into an underground aquifer.
- Patent Document 1 is characterized in that the CO2 gas stored in the CO2 gas tank is boosted by a pumping device, and the CO2 gas is micro-bubbled by injecting it from an injection well drilled vertically to the formation, and the CO2 gas is stored underground by dispersing the microbubbles in the formation water. A storage device and a storage method are proposed.
- Patent Document 2 is characterized in that CO2 gas is injected underground by a pumping device from an injection well drilled horizontally in the formation, the CO2 gas is made into microbubbles, and the microbubbles are dispersed in the formation water to store the CO2 gas underground. A storage device and a storage method have been proposed.
- Patent Document 3 is characterized in that the injected gas is micro-bubbled on the ground surface and mixed with the injection water to create a gas-liquid mixed fluid, which is injected into the oil layer or the gas layer from the injection well to fine gaps in the layer. An enhanced recovery method and an enhanced recovery system for oil or natural gas, which is characterized by enhanced recovery of oil or gas by microbubbles in injection water, have been proposed.
- Japanese Patent No. 5315346
- Japanese Patent No. 5399436
- Japanese Unexamined Patent Application, First Publication No. 2008-019644
- In Patent Document 1 and Patent Document 2, a filter is provided at the tip or the lower side of the injection well for pumping a stored material containing CO2 gas. In Patent Document 1 and Patent Document 2, when mixing the pumped fluid as a gas-liquid mixture fluid, fine suspended solids in the liquid can clog the filter. Patent Document 3 installs a micro-bubble generator in the upper portion of an oil well (inside a well near the ground surface at a depth of 5 m to 50 m). In Patent Document 3, in the process of transporting micro-bubbles to the underground reservoir layer that exists several thousand meters underground, the leakage of micro-bubble water from a joint in the tubing or casing is unavoidable, and the change in formation temperature and pressure induces changes in the properties of the micro-bubble water, such that there is a risk that the replacement of oil and gas with micro-bubble water will not proceed as initially assumed.
- Therefore, the inventors have found that the injection gas and the injection water are separately injected into the injection well by using an injection well including two passages, and the injection gas is passed through a micro-bubble generator installed at the lower end of the gas passage to efficiently generate the micro-bubbles and to efficiently penetrate the micro-bubbles into the gaps of the underground oil reservoir.
- The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for enhanced recovery of oil contained in an underground oil reservoir by using micro-bubbles.
- In order to solve the above problem and achieve the above object, the present invention employs the following aspects.
- (1) An enhanced oil recovery method according to an aspect of the present invention is an enhanced oil recovery method for enhanced recovery of oil contained in an underground oil reservoir by using an injection well including two passages of a water passage and a gas passage, the enhanced oil recovery method including a step of injecting injection water from the water passage, a step of injecting an injection gas from the gas passage and spraying the injection gas as a fine gas bubble flow through a micro-bubble generator which is installed at a lower end of the gas passage, and a step of penetrate into the underground oil reservoir a gas-liquid mixture fluid containing micro-bubbles generated by mixing the injection water and the fine gas bubble flow in the injection well.
- (2) In the enhanced oil recovery method described in (1) above, the water passage may be a water injection pipe, and the gas passage may be a gas injection pipe.
- (3) In the enhanced oil recovery method described in (1) above, the gas passage may be arranged inside the water passage, and the injection water may be injected between an inside of the water passage and an outside of the gas passage.
- (4) In the enhanced oil recovery method described in (1) above, the water passage may be arranged inside the gas passage, and the injection gas may be injected between an inside of the gas passage and an outside of the water passage.
- (5) In the enhanced oil recovery method described in any one of (1) to (4) above, the micro-bubble generator may be installed at a depth where the underground oil reservoir is located.
- According to the above aspect of the present invention, it is possible to provide a method for enhanced recovery of oil contained in an underground oil reservoir by using micro-bubbles.
-
FIG. 1 is a schematic view for explaining an enhanced oil recovery method according to the first embodiment of the present invention. -
FIG. 2 is a schematic view for explaining an enhanced oil recovery method according to the second embodiment of the present invention. -
FIG. 3 is a schematic view for explaining an enhanced oil recovery method according to the third embodiment of the present invention. -
FIG. 4 is a schematic view showing an example of a micro-bubble generator. - Hereinafter, embodiments for performing the present invention will be specifically described with reference to the drawings. In the following description, components common to each embodiment may be designated by the same reference numerals and duplicate description thereof may be omitted.
- The enhanced oil recovery method according to the first embodiment will be described with reference to
FIGS. 1 and 4 . -
FIG. 1 is a schematic view for explaining an enhanced oil recovery method according to the present embodiment. - As shown in
FIG. 1 , the recovery of oil contained in anunderground oil reservoir 212 is enhanced by using an injection well 101 including two passages of awater passage 104 and agas passage 105. The enhanced oil recovery method according to the present embodiment includes a step of injectinginjection water 102 from the water passage (water injection pipe) 104, a step of injecting aninjection gas 103 from the gas passage (gas injection pipe) 105 and spraying theinjection gas 103 as a fine gas bubble flow through amicro-bubble generator 210 installed at a lower end of thegas passage 105, and a step of penetrate a gas-liquid mixture fluid containing micro-bubbles by mixing theinjection water 102 and a fine gas bubble flow generated from themicro-bubble generator 210 in the injection well 101 into theunderground oil reservoir 212. - As shown in
FIG. 1 , parts other than the upper end of the injection well 101 are embedded in theground surface 211. The lower end of theinjection well 101 reaches the depth at which theunderground oil reservoir 212 is located. The injection well 101 is including two passages of thewater passage 104 and thegas passage 105. - The
injection water 102 is injected from thewater passage 104 on theground surface 211 side. River water and sea water are used as theinjection water 102, but the formation water and injection water produced from a production well may also be reused by mixing them with river water and sea water. However, in any of the cases, since water other than the formation water is injected, a chemical agent is added before the injection so as not to cause blockage of the fine gaps due to formation swelling by the injection water. - The
injection gas 103 is injected from thegas passage 105 on theground surface 211 side. Theinjection gas 103 is hydrocarbon gas, flare gas, nitrogen gas, CO2 gas, exhaust gas, or a gas that is a mixture of these. When CO2 gas or exhaust gas is used as theinjection gas 103, CO2 gas can be stored underground, which is effective in combating global warming. - In the present embodiment, the
water passage 104 and thegas passage 105 are arranged in parallel in the injection well 101. That is, theinjection gas 103 and theinjection water 102 are separately injected into the injection well 101. In other words, in the present embodiment, there is a structure in which apipe 202 a constitutes two passages with two pipes, i.e., the water passage (water injection pipe) 104 and the gas passage (gas injection pipe) 105. - The
micro-bubble generator 210 whose central material is a filter, which is a porous member, is installed at the lower end of thegas passage 105. Themicro-bubble generator 210 is installed at the depth at which theunderground oil reservoir 212 is located. As shown inFIG. 4 , in the case of the present embodiment, a shape of the filter has a cylindrical shape. When installed on an outer pipe of a dual channel pipe in the embodiment described later, the shape of the filter is a hollow coaxial cylindricality. - As the filter, for example, a member obtained by mixing and sintering ceramic particles and a binder for binding the particles, or a stainless steel sintered filter can be used. When the filter pore size is small, micro-bubbles are likely to be generated, but the passage resistance of a fluid increases, the pumping device for increasing the flow rate of the
injection gas 103 is increased in size. In addition, when the filter pore size is increased, the passage resistance of the fluid decreases, but the efficiency of micro-bubbling generator is degraded, and further, it is not preferable that the injection water passes through themicro-bubble generator 210, since there is a possibility that floating particle in the injection water may clog the filter. The micro-bubbles refer to bubbles with a diameter of less than 1 mm (including a supercritical state). - According to the present embodiment, the
injection gas 103 and theinjection water 102 are separately pumped into the well, the fine gas bubble flow is sprayed through themicro-bubble generator 210, and the gas-liquid mixture fluid containing the micro-bubbles generated by mixing theinjection water 102 and the fine gas bubble flow is penetrated into the gaps of theunderground oil reservoir 212, whereby oil, natural gas, and formation water can be discharged from the fine gaps of theunderground oil reservoir 212. This makes it possible to enhance the recovery of oil and natural gas. - The
micro-bubble generator 210 may be installed at the depth at which theunderground oil reservoir 212 at the lower end of the injection well 101 is located. The depth at which theunderground oil reservoir 212 is located is a position corresponding to the depth of theunderground oil reservoir 212 distributed on an outer periphery of the lower end of the injection well 101. By installing themicro-bubble generator 210 at the depth at which theunderground oil reservoir 212 is located, it is possible to suppress the disappearance of the generated micro-bubbles and penetrate the micro-bubbles into theunderground oil reservoir 212. - A
packer 203 prevents theinjection water 102 discharged from the lower end of thewater passage 104 and theinjection gas 103 discharged from the lower end of thegas passage 105 from flowing back to the ground surface. - The
water passage 104 may be a water injection pipe. Thegas passage 105 may be a gas injection pipe. - As described above, according to the present embodiment, the
injection gas 103 and theinjection water 102 are separately injected into the injection well 101 by using the injection well 101 including two passages, and the micro-bubbles are efficiently generated by passing themicro-bubble generator 210, and the gas is sprayed as a fine gas bubble flow. The gas-liquid mixture fluid containing the micro-bubbles generated by mixing with theinjection water 102 in the well efficiently penetrate theunderground oil reservoir 212. As a result, due to the effect that the gas-liquid mixture fluid containing the micro-bubbles is penetrated to the fine gaps in theunderground oil reservoir 212, the production rate of oil and natural gas from the production wells drilled at different points from the injection well 101 will increases. As a result, the recovery of the oil and natural gas contained in theunderground oil reservoir 212 can be enhanced. - The injection water and the injection gas moved from the injection well 101 to the production well together with the oil, the natural gas, and the formation water discharged from the fine gap by the micro-bubbles in the
underground oil reservoir 212 are produced from the production well. A production fluid is produced through the inside of a tubing pipe among the devices that reuse the separated natural gas and injection gas, and formation water and injection water into the injection well. A three-phase gas-liquid separator for separating the production fluid with different specific gravity on the ground surface separates natural gas and injection gas, oil, and formation water and injection water, and the natural gas and the injection gas are transferred to an injection gas tank and reused as injection gas. The separated formation water and injection water are also transferred to the injection water tank and reused as injection water. - (Note: a pipe used to produce oil and natural gas from the underground oil reservoir is called a tubing pipe, and the gas-liquid mixture fluid of oil, natural gas, injection gas, formation water, and injection water pass upward.)
- Next, the enhanced oil recovery method according to the second embodiment will be described with reference to
FIG. 2 , but the basic configuration is the same as that of the first embodiment. Therefore, the same reference numerals are given to the same components, the description thereof will be omitted, and only the differences will be described. - The second embodiment is different from the first embodiment in that a
gas passage 205 is arranged inside awater passage 204, and theinjection water 102 is injected between the inside of thewater passage 204 and the outside of thegas passage 205. -
FIG. 2 is a schematic view for explaining an enhanced oil recovery method according to the present embodiment. - As shown in
FIG. 2 , in the enhanced oil recovery method according to the present embodiment, the gas passage (inner pipe) 205 is arranged inside the water passage (outer pipe) 204. That is, the injection well 201 according to the present embodiment has a structure of apipe 202 b that constitutes two passages with the dual channel pipe of the water passage (outer pipe) 204 and the gas passage (inner pipe) 205. In the present embodiment, theinjection water 102 is injected between thewater passage 204 and thegas passage 205, theinjection gas 103 is injected into thegas passage 205, and themicro-bubble generator 210 is installed at the lower end of thegas passage 205. - The same effect as that of the first embodiment can be obtained in the present embodiment. That is, the micro-bubbles are efficiently generated by passing through the
micro-bubble generator 210 is installed at the lower end of thegas passage 205, and the gas is sprayed as a fine gas bubble flow. The gas-liquid mixture fluid containing the micro-bubbles generated by mixing with theinjection water 102 in the well efficiently penetrates theunderground oil reservoir 212. As a result, due to the effect that the gas-liquid mixture fluid containing the micro-bubbles is penetrate to the fine gaps in theunderground oil reservoir 212, the production rate of oil and natural gas from the production wells drilled at different points from the injection well 201 will increases. As a result, the recovery of the oil contained in theunderground oil reservoir 212 can be enhanced. - Further, when the structure has the dual channel pipe as in the present embodiment, since it can be handled as a single pipe, the effect of reducing a work over cost and a down hole tools cost is expected.
- Next, the enhanced oil recovery method according to the third embodiment will be described with reference to
FIG. 3 , but the basic configuration is the same as that of the first embodiment. Therefore, the same reference numerals are given to the same components, the description thereof will be omitted, and only the differences will be described. - The third embodiment is different from the first embodiment in that the
water passage 304 is arranged inside thegas passage 305, and theinjection gas 103 is injected between the inside of thegas passage 305 and the outside of thewater passage 304. -
FIG. 3 is a schematic view for explaining an enhanced oil recovery method according to the present embodiment. - As shown in
FIG. 3 , in the enhanced oil recovery method according to the present embodiment, the water passage (inner pipe) 304 is arranged inside the gas passage 305 (outer pipe). That is, the injection well 301 according to the present embodiment has a structure of apipe 202 c that constitutes two passages with the dual channel pipe of the gas passage (outer pipe) 305 and the water passage (inner pipe) 304. In the present embodiment, theinjection water 102 is injected into thewater passage 304, theinjection gas 103 is injected between the inside of thegas passage 305 and the outside of thewater passage 304, and themicro-bubble generator 210 is installed at the lower end of thegas passage 305. - The same effect as that of the first embodiment can be obtained in the present embodiment. That is, the micro-bubbles are efficiently generated by passing through the
micro-bubble generator 210 is installed at the lower end of thegas passage 305, and the gas is sprayed as a fine gas bubble flow. The gas-liquid mixture fluid containing the micro-bubbles generated by mixing with theinjection water 102 in the well efficiently penetrates theunderground oil reservoir 212. As a result, due to the effect that the gas-liquid mixture fluid containing the micro-bubbles is penetrated to the fine gaps in theunderground oil reservoir 212, the production rate of oil and natural gas from the production wells drilled at different points from the injection well 301 will increases. As a result, the recovery of the oil contained in theunderground oil reservoir 212 can be enhanced. - Further, when the structure has the dual channel pipe as in the present embodiment, since it can be handled as a single pipe, the effect of reducing a work over cost and a down hole tools cost is expected.
- Although the embodiments of the present invention have been described above, the embodiments have been presented as examples, and the scope of the present invention is not limited to the embodiments. The above-described embodiment can be performed in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The above-described embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.
- According to the present invention, it is possible to provide a method for enhanced recovery of oil contained in an underground oil reservoir by using micro-bubbles.
-
-
- 101, 201, 301: Injection well
- 102: Injection water
- 103: Injection gas
- 104, 204, 304: Water passage (water injection pipe)
- 105, 205, 305: Gas passage (gas injection pipe)
- 202 a: Pipe that constitutes two passages with two pipes
- 202 b, 202 c: Pipe that constitutes two passages with dual channel pipe
- 203: Packer
- 210: Micro-bubble generator
- 211: Ground surface
- 212: Underground oil reservoir
Claims (3)
1. An enhanced oil recovery method for enhanced recovery of oil contained in an underground oil reservoir by using an injection well including two passages of a gas passage and a water passage arranged inside the gas passage, the enhanced oil recovery method comprising:
a step of injecting injection water from the water passage;
a step of injecting an injection gas from the gas passage and spraying the injection gas as a fine gas bubble flow through a micro-bubble generator which is installed at a lower end of the gas passage; and
a step of penetrate into the underground oil reservoir a gas-liquid mixture fluid containing micro-bubbles generated by mixing the injection water and the fine gas bubble flow in the injection well, wherein
the micro-bubble generator is positioned at a depth of the underground oil reservoir, and
the injection gas is injected between an inside of the gas passage and an outside of the water passage.
2. The enhanced oil recovery method according to claim 1 , wherein
the water passage is a water injection pipe, and the gas passage is a gas injection pipe.
3.-5. (canceled)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020-153491 | 2020-09-14 | ||
JP2020153491 | 2020-09-14 | ||
PCT/JP2021/014352 WO2022054326A1 (en) | 2020-09-14 | 2021-04-02 | Method for enhanced oil recovery with injection well configured by two flow channels |
Publications (1)
Publication Number | Publication Date |
---|---|
US20230038432A1 true US20230038432A1 (en) | 2023-02-09 |
Family
ID=80631509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/789,699 Pending US20230038432A1 (en) | 2020-09-14 | 2021-04-02 | Enhanced oil recovery method using injection well including two passages |
Country Status (3)
Country | Link |
---|---|
US (1) | US20230038432A1 (en) |
JP (1) | JP7139546B2 (en) |
WO (1) | WO2022054326A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116927731A (en) * | 2023-08-02 | 2023-10-24 | 中国地质大学(武汉) | Method for improving petroleum recovery ratio by using polymer flooding post-autogenous carbon dioxide system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114658402A (en) * | 2022-04-26 | 2022-06-24 | 国油伟泰(北京)科技有限公司 | Method for improving oil field recovery ratio |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6325147B1 (en) * | 1999-04-23 | 2001-12-04 | Institut Francais Du Petrole | Enhanced oil recovery process with combined injection of an aqueous phase and of at least partially water-miscible gas |
US8991510B2 (en) * | 2009-03-13 | 2015-03-31 | Regents Of The University Of Minnesota | Carbon dioxide-based geothermal energy generation systems and methods related thereto |
US10648305B2 (en) * | 2018-06-11 | 2020-05-12 | Saudi Arabian Oil Company | Systems and methods for carbonated water flooding of hydrocarbon reservoirs |
US11174715B2 (en) * | 2019-06-10 | 2021-11-16 | Saudi Arabian Oil Company | Coupling enhanced oil recovery with energy requirements for crude production and processing |
US20210380866A1 (en) * | 2020-06-05 | 2021-12-09 | Saudi Arabian Oil Company | Sago-based formulations for gel applications including conformance control and water shutoffs |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008019644A (en) * | 2006-07-13 | 2008-01-31 | Hitoshi Koide | Promoted recovery method of petroleum or natural gas and its promoted recovery system |
JP5706713B2 (en) * | 2011-02-24 | 2015-04-22 | 一般財団法人電力中央研究所 | Recovering crude oil from oil and gas fields |
JP2017218728A (en) * | 2016-06-03 | 2017-12-14 | 独立行政法人石油天然ガス・金属鉱物資源機構 | Bubble injection system, bubble injection method and method for producing bubble injection system |
JP2017218729A (en) * | 2016-06-03 | 2017-12-14 | Jx石油開発株式会社 | Bubble introduction system and bubble introduction method |
JP6823282B2 (en) * | 2016-09-14 | 2021-02-03 | 株式会社大林組 | Gas recovery system and gas recovery method |
-
2021
- 2021-04-02 WO PCT/JP2021/014352 patent/WO2022054326A1/en active Application Filing
- 2021-04-02 US US17/789,699 patent/US20230038432A1/en active Pending
- 2021-04-02 JP JP2022532016A patent/JP7139546B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6325147B1 (en) * | 1999-04-23 | 2001-12-04 | Institut Francais Du Petrole | Enhanced oil recovery process with combined injection of an aqueous phase and of at least partially water-miscible gas |
US8991510B2 (en) * | 2009-03-13 | 2015-03-31 | Regents Of The University Of Minnesota | Carbon dioxide-based geothermal energy generation systems and methods related thereto |
US10648305B2 (en) * | 2018-06-11 | 2020-05-12 | Saudi Arabian Oil Company | Systems and methods for carbonated water flooding of hydrocarbon reservoirs |
US11174715B2 (en) * | 2019-06-10 | 2021-11-16 | Saudi Arabian Oil Company | Coupling enhanced oil recovery with energy requirements for crude production and processing |
US20210380866A1 (en) * | 2020-06-05 | 2021-12-09 | Saudi Arabian Oil Company | Sago-based formulations for gel applications including conformance control and water shutoffs |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116927731A (en) * | 2023-08-02 | 2023-10-24 | 中国地质大学(武汉) | Method for improving petroleum recovery ratio by using polymer flooding post-autogenous carbon dioxide system |
Also Published As
Publication number | Publication date |
---|---|
WO2022054326A1 (en) | 2022-03-17 |
JPWO2022054326A1 (en) | 2022-03-17 |
JP7139546B2 (en) | 2022-09-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20230038432A1 (en) | Enhanced oil recovery method using injection well including two passages | |
KR101240038B1 (en) | Storing device for stored substance and method for storing stored substance | |
US10683736B2 (en) | Method and system for recovering gas in natural gas hydrate exploitation | |
CA2762416C (en) | High pressure hydrocarbon fracturing on demand method and related process | |
KR101354821B1 (en) | Device and method for sequestering a substance | |
EP2695671B1 (en) | Retention device for retained substance and retention method | |
US10053966B2 (en) | Nanogas flooding of subterranean formations | |
US11585195B2 (en) | Treatment of subterranean formations | |
JP5062527B2 (en) | High pressure carbon dioxide foaming device and carbon dioxide underground storage system using the same | |
CN111492121B (en) | Methane gas production facility and methane gas production method | |
JP2017218728A (en) | Bubble injection system, bubble injection method and method for producing bubble injection system | |
AU2017234995B2 (en) | Artificial lift method | |
JP7369322B2 (en) | Method for underground storage of injected gas including CO2 gas and enhanced oil recovery | |
Sheridan et al. | Downhole Oil and Water Separation: A New Start | |
JP5208862B2 (en) | Emulsion production / injection apparatus and method, and methane hydrate mining method | |
CN110073078B (en) | Methane gas production equipment and methane gas production method | |
OA17501A (en) | High pressure hydrocarbon fracturing on demand method and related processes. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: JAPAN PETROLEUM EXPLORATION CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TERAO, YOSHIHIRO;KUROSAWA, KAZUTO;REEL/FRAME:060395/0410 Effective date: 20220525 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |