CN114109332B - Combined type three-dimensional in-situ combustion method for thick-layer massive heavy oil reservoir - Google Patents
Combined type three-dimensional in-situ combustion method for thick-layer massive heavy oil reservoir Download PDFInfo
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- CN114109332B CN114109332B CN202010894541.9A CN202010894541A CN114109332B CN 114109332 B CN114109332 B CN 114109332B CN 202010894541 A CN202010894541 A CN 202010894541A CN 114109332 B CN114109332 B CN 114109332B
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 65
- 239000000295 fuel oil Substances 0.000 title claims abstract description 48
- 238000009841 combustion method Methods 0.000 title claims abstract description 11
- 239000003921 oil Substances 0.000 claims abstract description 85
- 238000002485 combustion reaction Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000010795 Steam Flooding Methods 0.000 claims abstract description 20
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 239000002131 composite material Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims 2
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000004069 differentiation Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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
- E21B43/20—Displacing by water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The application relates to a compound three-dimensional in-situ combustion method of a thick-layer massive heavy oil reservoir, which comprises the steps of injecting air into the lower part of the oil layer of the thick-layer massive heavy oil reservoir and igniting to form in-situ combustion development from bottom to top; after the oil layer burns for a set time, water is injected into the upper part of the oil layer of the thick-layer massive heavy oil reservoir to form hot water flooding or steam flooding development from top to bottom, and in-situ combustion development from bottom to top and hot water flooding or steam flooding development from top to bottom in the oil layer form compound three-dimensional in-situ combustion development. The application utilizes the strong gravity separation effect of fluids with different densities in the thick-layer massive heavy oil reservoir, and gas injection and water injection separation are carried out, so that the development of a compound three-dimensional in-situ combustion is formed, the utilization degree of the thick-layer massive heavy oil reservoir is greatly improved, and the recovery ratio is improved.
Description
Technical Field
The application relates to the technical field of petroleum exploitation, in particular to a compound three-dimensional in-situ combustion method for thick-layer massive heavy oil reservoirs.
Background
The in-situ combustion is a thermal recovery method for improving the recovery ratio of crude oil, and has the advantages of low cost, low energy consumption, high oil displacement efficiency, wide adaptability, wide prospect and capability of realizing crude oil modification, but complex oil displacement mechanism, multiple displacement mechanisms such as steam displacement, hot water displacement, flue gas displacement and the like, and great control difficulty in the implementation process, so that the on-site success rate is low. The successful development of oil reservoirs belongs to thin-layer oil reservoirs, and the in-situ combustion of thick-layer massive heavy oil reservoirs is not a successful precedent.
Therefore, the inventor provides a thick-layer block heavy oil reservoir compound type three-dimensional in-situ combustion method by virtue of experience and practice of relevant industries for many years so as to overcome the defects of the prior art.
Disclosure of Invention
The application aims to provide a compound three-dimensional in-situ combustion method for thick-layer massive heavy oil reservoirs, which utilizes the strong gravity differentiation effect of fluids with different densities in the thick-layer massive heavy oil reservoirs, and adopts gas injection and water injection separation to form compound three-dimensional in-situ combustion development, thereby greatly improving the utilization degree of the thick-layer massive heavy oil reservoirs and improving the recovery ratio.
The application aims to realize the method for the compound three-dimensional in-situ combustion of the thick-layer massive heavy oil reservoir, which comprises the steps of injecting air into the lower part of the oil layer of the thick-layer massive heavy oil reservoir and igniting to form in-situ combustion development from bottom to top; after the oil layer burns for a set time, water is injected into the upper part of the oil layer of the thick-layer massive heavy oil reservoir to form hot water flooding or steam flooding development from top to bottom, and in-situ combustion development from bottom to top and hot water flooding or steam flooding development from top to bottom in the oil layer form compound three-dimensional in-situ combustion development.
In a preferred embodiment of the present application, the method for the compound three-dimensional in-situ combustion of thick-layer massive heavy oil reservoirs comprises the following steps:
step a, perforating positions corresponding to the upper part of an oil layer and the lower part of the oil layer on an inner sleeve of a well of a thick-layer massive heavy oil reservoir respectively to form an upper perforation section and a lower perforation section;
step b, sleeving a packer on the oil pipe, and feeding the oil pipe into the sleeve, wherein the packer is set between the upper perforation section and the lower perforation section, and the bottom outlet of the oil pipe can be communicated with the lower part of the oil layer through the lower perforation section;
c, injecting air into the lower part of the oil layer through an oil pipe, igniting, and moving the air upwards to form in-situ combustion development from bottom to top;
d, after the in-situ combustion development setting time, injecting water into an annulus between the oil pipe and the casing, and enabling the water to enter the upper part of the oil layer through the upper perforation section and flow downwards;
step e, absorbing residual heat behind the in-situ combustion layer by water to form hot water or steam, and developing a hot water drive or steam drive from top to bottom;
and f, developing an in-situ combustion layer from bottom to top in the oil layer and developing a hot water drive or a steam drive from top to bottom to form a compound three-dimensional in-situ combustion layer.
In a preferred embodiment of the application, water is injected into the upper part of an oil layer of a thick-layer massive heavy oil reservoir according to a set water-air ratio.
In a preferred embodiment of the application, the water-to-air ratio ranges from greater than 0.0026 to less than 0.0053.
In a preferred embodiment of the present application, the bottom opening of the oil pipe is provided with a bell mouth structure with a diameter gradually increasing from top to bottom.
In a preferred embodiment of the application, the packer is a mechanically compressed packer.
From the above, the thick-layer massive heavy oil reservoir composite type three-dimensional in-situ combustion method provided by the application has the following beneficial effects:
in the method for the composite three-dimensional in-situ combustion of the thick-layer massive heavy oil reservoir, strong gravity differentiation is generated by utilizing fluids with different densities in the thick-layer massive heavy oil reservoir, low-density gas moves to the upper part of the oil reservoir, high-density oil and water move to the lower part of the oil reservoir, gas injection and water injection are separated, and air and water are respectively injected to the lower part of the oil reservoir and the upper part of the oil reservoir, so that in-situ combustion development from bottom to top and hot water drive or steam drive development from top to bottom are respectively formed, the two forms the composite three-dimensional in-situ combustion development, the contradiction that in-situ combustion only uses the upper oil layer and hot water (or steam) drive only uses the longitudinal uneven utilization of the lower part of the oil layer in the thick-layer massive heavy oil reservoir is solved, the utilization degree of the thick-layer massive heavy oil reservoir is greatly improved, the recovery ratio is also utilized, and the residual heat of the in-situ combustion is saved.
Drawings
The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the application.
Wherein:
fig. 1 is a schematic diagram illustrating the state of step a in the present application.
FIG. 2 is a schematic diagram of the assembly of a packer with an oil pipe according to the present application.
Fig. 3 is a schematic diagram illustrating the state of step b in the present application.
Fig. 4 is a schematic diagram illustrating the state of step c in the present application.
Fig. 5 is a schematic diagram showing the states of steps d to f in the present application.
In the figure:
1. a sleeve;
11. an upper perforation section; 12. a lower perforation section;
2. an oil pipe;
21. a flare structure;
3. a packer;
91. the upper part of the oil layer; 92. the lower part of the oil layer.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present application, a specific embodiment of the present application will be described with reference to the accompanying drawings.
The specific embodiments of the application described herein are for purposes of illustration only and are not to be construed as limiting the application in any way. Given the teachings of the present application, one of ordinary skill in the related art will contemplate any possible modification based on the present application, and such should be considered to be within the scope of the present application. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 5, the present application provides a method for composite three-dimensional in-situ combustion of thick-layer massive heavy oil reservoirs, which comprises injecting air into the lower reservoir portion 92 of the thick-layer massive heavy oil reservoirs and igniting to form in-situ combustion development from bottom to top; after the oil layer burns for a set time, water is injected into the upper part 91 of the oil layer of the thick-layer massive heavy oil reservoir to form hot water flooding or steam flooding development from top to bottom, and in-situ combustion development from bottom to top and hot water flooding or steam flooding development from top to bottom in the oil layer form compound three-dimensional in-situ combustion development.
In the method for the composite three-dimensional in-situ combustion of the thick-layer massive heavy oil reservoir, strong gravity differentiation is generated by utilizing fluids with different densities in the thick-layer massive heavy oil reservoir, low-density gas moves to the upper part of the oil reservoir, high-density oil and water move to the lower part of the oil reservoir, gas injection and water injection are separated, and air and water are respectively injected to the lower part of the oil reservoir and the upper part of the oil reservoir, so that in-situ combustion development from bottom to top and hot water drive or steam drive development from top to bottom are respectively formed, the two forms the composite three-dimensional in-situ combustion development, the contradiction that in-situ combustion only uses the upper oil layer and hot water (or steam) drive only uses the longitudinal uneven utilization of the lower part of the oil layer in the thick-layer massive heavy oil reservoir is solved, the utilization degree of the thick-layer massive heavy oil reservoir is greatly improved, the recovery ratio is also utilized, and the residual heat of the in-situ combustion is saved.
Further, the thick-layer massive heavy oil reservoir compound type three-dimensional in-situ combustion method comprises the following steps of:
step a, as shown in fig. 1, a casing 1 is arranged in a well of a thick-layer massive heavy oil reservoir, and holes are respectively formed in positions corresponding to an upper oil layer 91 and a lower oil layer 92 on the casing to form an upper perforation section 11 and a lower perforation section 12 respectively;
step b, as shown in fig. 2, a packer 3 is sleeved on the oil pipe 2, as shown in fig. 3, the oil pipe 2 is put into the casing 1, the packer 3 is set between the upper perforation section 11 and the lower perforation section 12, and the bottom outlet of the oil pipe 2 can be communicated with the lower part 92 of the oil layer through the lower perforation section 12;
step c, as shown in fig. 4, injecting air into the lower part 92 of the oil layer through the oil pipe 2 and igniting, and moving the air upwards to form in-situ combustion development from bottom to top;
step d, as shown in fig. 5, after the in-situ combustion development setting time, injecting water into the annulus between the oil pipe 2 and the casing 1, and allowing the water to enter the upper part 91 of the oil layer through the upper perforation section 11 and flow downwards;
step e, absorbing residual heat behind the in-situ combustion layer by water to form hot water or steam, and developing a hot water drive or steam drive from top to bottom;
whether the injected water forms a hot water drive or a steam drive in the reservoir depends on the pressure of the target reservoir, the temperature of the in-situ combustion waste heat, implementation conditions and other factors, and both the hot water drive and the steam drive are possible, but are beneficial to reservoir development.
F, developing a lower-to-upper in-situ combustion layer in the oil layer and developing a hot water drive or a steam drive from top to bottom to form a compound three-dimensional in-situ combustion layer;
the final recovery ratio of the steam flooding can generally reach 50% -60%, the final recovery ratio of the in-situ combustion can generally reach 60% -80%, and the application combines the two, so that the final recovery ratio can be expected to reach more than 60%.
Further, water is injected into the upper oil layer 91 of the thick-layer massive heavy oil reservoir according to a set water-air ratio. In this embodiment, the water-air ratio is in the range of more than 0.0026 and less than 0.0053.
Further, in the oil pipe 2 adopted in the step b, a bell mouth structure 21 with a diameter gradually increasing from top to bottom is arranged at the bottom opening of the oil pipe 2.
Further, the packer 3 installed on the oil pipe 2 adopted in the step b is a mechanical compression type packer, the specific form of the packer 3 is determined by actual production, and the packer commonly used in the prior art is adopted.
From the above, the thick-layer massive heavy oil reservoir composite type three-dimensional in-situ combustion method provided by the application has the following beneficial effects:
in the method for the composite three-dimensional in-situ combustion of the thick-layer massive heavy oil reservoir, strong gravity differentiation is generated by utilizing fluids with different densities in the thick-layer massive heavy oil reservoir, low-density gas moves to the upper part of the oil reservoir, high-density oil and water move to the lower part of the oil reservoir, gas injection and water injection are separated, and air and water are respectively injected to the lower part of the oil reservoir and the upper part of the oil reservoir, so that in-situ combustion development from bottom to top and hot water drive or steam drive development from top to bottom are respectively formed, the two forms the composite three-dimensional in-situ combustion development, the contradiction that in-situ combustion only uses the upper oil layer and hot water (or steam) drive only uses the longitudinal uneven utilization of the lower part of the oil layer in the thick-layer massive heavy oil reservoir is solved, the utilization degree of the thick-layer massive heavy oil reservoir is greatly improved, the recovery ratio is also utilized, and the residual heat of the in-situ combustion is saved.
The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this application, and are intended to be within the scope of this application.
Claims (5)
1. A compound three-dimensional in-situ combustion method for a thick-layer massive heavy oil reservoir is characterized by comprising the steps of injecting air into the lower part of an oil layer of the thick-layer massive heavy oil reservoir and igniting to form in-situ combustion development from bottom to top; after the oil layer burns for a set time, water is injected into the upper part of the oil layer of the thick-layer massive heavy oil reservoir to form hot water flooding or steam flooding development from top to bottom, and in-situ combustion development from bottom to top and hot water flooding or steam flooding development from top to bottom in the oil layer form compound three-dimensional in-situ combustion development;
the method comprises the following steps:
step a, perforating positions corresponding to the upper part of an oil layer and the lower part of the oil layer on an inner sleeve of a well of a thick-layer massive heavy oil reservoir respectively to form an upper perforation section and a lower perforation section;
step b, sleeving a packer on the oil pipe, and feeding the oil pipe into the sleeve, wherein the packer is set between the upper perforation section and the lower perforation section, and the bottom outlet of the oil pipe can be communicated with the lower part of the oil layer through the lower perforation section;
c, injecting air into the lower part of the oil layer through an oil pipe, igniting, and moving the air upwards to form in-situ combustion development from bottom to top;
d, after the in-situ combustion development setting time, injecting water into an annulus between the oil pipe and the casing, and enabling the water to enter the upper part of the oil layer through the upper perforation section and flow downwards;
step e, absorbing residual heat behind the in-situ combustion layer by water to form hot water or steam, and developing a hot water drive or steam drive from top to bottom;
and f, developing an in-situ combustion layer from bottom to top in the oil layer and developing a hot water drive or a steam drive from top to bottom to form a compound three-dimensional in-situ combustion layer.
2. The method for composite three-dimensional in-situ combustion of thick-layer massive heavy oil reservoirs according to claim 1, wherein water is injected into the upper part of the oil layer of the thick-layer massive heavy oil reservoirs according to a set water-air ratio.
3. The thick-layer bulk heavy oil reservoir composite solid in-situ combustion method of claim 2, wherein the water-to-air ratio ranges from greater than 0.0026 to less than 0.0053.
4. The method for composite solid in-situ combustion of thick-layer massive heavy oil reservoirs according to claim 1, wherein the bottom opening of the oil pipe is provided with a horn mouth structure with diameters increasing from top to bottom.
5. The method for composite three-dimensional in-situ combustion of thick-layer massive heavy oil reservoirs of claim 1, wherein the packer is a mechanically-compressed packer.
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| CN101798915A (en) * | 2010-04-26 | 2010-08-11 | 胡士清 | Method for improving recovery ratio of thick-layer massive thickened oil by utilizing subsection fireflooding exploitation |
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| CN105134153A (en) * | 2015-09-07 | 2015-12-09 | 中国石油天然气股份有限公司 | Fireflooding ignition method and pipe column thereof |
| CA2909385A1 (en) * | 2014-10-21 | 2016-04-21 | Petrochina Company Limited | Layered ignition device, injection production system and injection production method |
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2020
- 2020-08-31 CN CN202010894541.9A patent/CN114109332B/en active Active
Patent Citations (7)
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