CN110552672A - Concentric tube multilayer steam injection system of steam injection well - Google Patents
Concentric tube multilayer steam injection system of steam injection well Download PDFInfo
- Publication number
- CN110552672A CN110552672A CN201910851389.3A CN201910851389A CN110552672A CN 110552672 A CN110552672 A CN 110552672A CN 201910851389 A CN201910851389 A CN 201910851389A CN 110552672 A CN110552672 A CN 110552672A
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- steam injection
- packer
- concentric
- steam
- oil
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 90
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 239000003129 oil well Substances 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000010410 layer Substances 0.000 abstract description 37
- 230000000694 effects Effects 0.000 abstract description 5
- 239000011229 interlayer Substances 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 35
- 238000005516 engineering process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000010795 Steam Flooding Methods 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B43/14—Obtaining from a multiple-zone well
-
- 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
Landscapes
- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a concentric tube multilayer steam injection system for a steam injection well, and belongs to the technical field of steam injection systems for steam injection wells. The oil layer position is arranged between a high-temperature packer I and a high-temperature packer II, a concentric injection allocation device I is arranged on an outer oil pipe hanger, the oil layer position is arranged between the high-temperature packer II and a high-pressure sealing assembly, the concentric injection allocation device II is arranged on the outer oil pipe hanger, the oil layer position is arranged between a suspended packer sealing assembly and a high-temperature packer III, a concentric injection allocation device III is arranged on an inner oil pipe hanger, the oil layer position is arranged at the lower part of the high-temperature packer III, and a concentric injection allocation device IV is arranged on the inner oil pipe hanger. The concentric tube multi-layer steam injection system of the steam injection well realizes the steam injection of a multi-layer section without moving a tubular column, and reduces the working intensity of operation and the waste of heat energy. For multilayer heterogeneous oil reservoirs, the interlayer contradiction is effectively solved, technical support is provided for later fine steam injection and fine management, and the development effect of the oil field is improved.
Description
Technical Field
The invention relates to a concentric tube multilayer steam injection system for a steam injection well, and belongs to the technical field of steam injection systems for steam injection wells.
Background
Steam injection thermal oil recovery is a main mode of thick oil recovery at present, and due to the heterogeneity of a thick oil reservoir and co-production co-injection in the initial stage of steam development, later-stage oil reservoir utilization is uneven, interlayer contradiction is prominent, high-permeability layers are recycled during steam injection, low-permeability layers absorb less steam or even do not absorb steam, interlayer contradiction is prominent, so that all layers of the oil reservoir use inequality, the steam wave and volume are reduced, the recovery ratio of an oil well is influenced, and the problem of uneven steam absorption is more prominent when later-stage oil field exploitation enters a steam drive stage, so that the development of the oil field is seriously influenced.
Disclosure of Invention
The invention aims to solve the problems in the prior art and further provides a concentric tube multilayer steam injection system for a steam injection well.
The purpose of the invention is realized by the following technical scheme:
A concentric tube multi-layer steam injection system for a steam injection well, comprising: the oil well casing pipe, the small cross joint I, the small cross joint II, the large cross joint, the inner tubing hanger, the pressure gauge I, the orifice plate flowmeter I, the steam built-in regulating valve I, the pressure gauge II, the orifice plate flowmeter II, the steam built-in regulating valve II, the outer tubing hanger, the high-temperature packer I, the concentric injection distributor I, the high-temperature packer II, the concentric injection distributor II, the high-pressure sealing assembly, the suspended packer sealing assembly, the concentric injection distributor III, the high-temperature packer III and the concentric injection distributor IV are sequentially arranged on the upper end of the oil well casing pipe, the small cross joint II and the large cross joint are sequentially arranged on the oil well casing pipe at the lower end of the small cross joint I, the pressure gauge I, the orifice plate flowmeter I and the steam built-in regulating valve I are sequentially arranged on the pipeline at one side of the small cross joint II, the primary end of the pipeline at one side of the small cross joint is communicated with the end of, the upper end of the inner tubing hanger is arranged in the oil well casing between the small four-way I and the small four-way II, the upper end of the outer tubing hanger is arranged in the oil well casing between the small four-way II and the large four-way II, the inner tubing hanger is arranged in the outer tubing hanger, the lower part of the oil well casing is sequentially provided with a high-temperature packer I and a high-temperature packer II, the high-pressure packer comprises a high-pressure sealing assembly, a hanging packer sealing assembly and a high-temperature packer III, wherein a concentric injection allocation device I is arranged between the high-temperature packer I and the high-temperature packer II for oil layer position and outer oil pipe hanging, a concentric injection allocation device II is arranged between the high-temperature packer II and the high-pressure sealing assembly for oil layer position and outer oil pipe hanging, a concentric injection allocation device III is arranged between the hanging packer sealing assembly and the high-temperature packer III for oil layer position and inner oil pipe hanging, and a concentric injection allocation device IV is arranged at the lower part of the high-temperature packer III for oil layer position and inner oil pipe hanging.
The invention has the beneficial effects that:
As the oil field enters a later steam-flooding stage, a high-permeability layer forms a steam channeling channel, a low-permeability layer does not absorb steam, the layered steam injection technology can effectively relieve the contradiction between reservoir layers, balance the longitudinal steam absorption profile of an oil layer and improve the recovery ratio. The invention relates to a concentric tube multilayer steam injection system of a steam injection well, which adopts a layered steam injection technology according to the physical property difference of an oil layer, adopts a concentric tube column well head distribution device to realize layered steam injection when the physical property difference of the oil layer is more than or equal to 3, and adopts a packer and an injection allocation device to realize layered steam injection when the physical property difference is less than 3. The waste of heat energy in the steam injection process is reduced, the oil reservoir utilization degree is improved, and the final oil reservoir recovery rate is improved.
The concentric tube multi-layer steam injection system of the steam injection well realizes the steam injection of a multi-layer section without moving a tubular column, and reduces the working intensity of operation and the waste of heat energy. For multilayer heterogeneous oil reservoirs, the interlayer contradiction is effectively solved, technical support is provided for later fine steam injection and fine management, and the development effect of the oil field is improved.
Drawings
FIG. 1 is a schematic structural view of a concentric tube multi-layer steam injection system of a steam injection well according to the present invention.
In the drawing, reference numerals, 1 is an oil well casing, 2 is a first small four-way, 3 is a second small four-way, 4 is a large four-way, 5 is an internal tubing hanger, 6 is a first pressure gauge, 7 is a first orifice plate flowmeter, 8 is a first steam built-in regulating valve, 9 is a second pressure gauge, 10 is a second orifice plate flowmeter, 11 is a second steam built-in regulating valve, 12 is an external tubing hanger, 13 is a first high-temperature packer, 14 is a first concentric injection allocation device, 15 is a second high-temperature packer, 16 is a second concentric injection allocation device, 17 is a high-pressure sealing assembly, 18 is a suspended packer sealing assembly, 19 is a third concentric injection allocation device, 20 is a third high-temperature packer, and 21 is a fourth concentric injection allocation device.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the present embodiment relates to a concentric tube multilayer steam injection system for a steam injection well, which includes: the oil well casing pipe 1, the small cross joint I2, the small cross joint II 3, the large cross joint 4, the inner tubing hanger 5, the pressure gauge I6, the orifice plate flowmeter I7, the steam built-in regulating valve I8, the pressure gauge II 9, the orifice plate flowmeter II 10, the steam built-in regulating valve II 11, the outer tubing hanger 12, the high temperature packer I13, the concentric injection allocation device I14, the high temperature packer II 15, the concentric injection allocation device II 16, the high pressure seal assembly 17, the suspended packer seal assembly 18, the concentric injection allocation device III 19, the high temperature packer III 20 and the concentric injection allocation device IV 21 are sequentially arranged on the oil well casing pipe 1 at the lower end of the small cross joint I2, the small cross joint II 3 and the large cross joint I4 are sequentially arranged on the oil well casing pipe 1 at the lower end of the small cross joint I2, the pressure gauge I6, the orifice plate flowmeter I7 and the steam built-in regulating valve I8 are sequentially arranged on, The device comprises a second orifice plate flowmeter 10 and a second steam built-in regulating valve 11, wherein the primary end of the pipeline on one side of a first small cross joint 2 is communicated with the primary end of the pipeline on one side of a second small cross joint 3, the upper end of an inner tubing hanger 5 is arranged in an oil well casing 1 between the first small cross joint 2 and the second small cross joint 3, the upper end of an outer tubing hanger 12 is arranged in the oil well casing 1 between the second small cross joint 3 and a large cross joint 4, the inner tubing hanger 5 is arranged in the outer tubing hanger 12, the lower part of the oil well casing 1 is sequentially provided with a first high-temperature packer 13, a second high-temperature packer 15, a high-pressure seal assembly 17, a suspended packer seal assembly 18 and a third high-temperature packer 20, a first concentric injection distributor 14 is arranged between the first high-temperature packer 13 and the second high-temperature packer 15, a second concentric injection distributor 16 is arranged between the high-temperature packer 15 and the high-, an oil layer position is arranged between the suspension packer sealing assembly 18 and the high-temperature packer III 20, a concentric injection allocation device III 19 is arranged on the inner oil pipe hanger 5, an oil layer position is arranged at the lower part of the high-temperature packer III 20, and a concentric injection allocation device IV 21 is arranged on the inner oil pipe hanger 5.
And the orifice plate flowmeter I7, the orifice plate flowmeter II 10, the steam built-in regulating valve I8 and the steam built-in regulating valve II 11 are connected by flanges.
The inner tubing hanger 5, the outer tubing hanger 12, the first high-temperature packer 13, the first concentric injection allocation device 14, the second high-temperature packer 15, the second concentric injection allocation device 16, the high-pressure sealing assembly 17, the hanging packer sealing assembly 18, the third concentric injection allocation device 19, the third high-temperature packer 20 and the fourth concentric injection allocation device 21 are all in threaded connection through tubing.
The heavy oil reservoir layered steam injection is to divide an oil layer by means of mechanical division, reasonably perform steam injection allocation on each steam injection layer according to the oil layer requirement, and analyze and calculate by using steam injection software in combination with physical properties (parameters such as oil layer thickness, porosity, permeability, saturation and the like) of each reservoir to design reasonable steam injection parameters. And adjusting the wellhead steam distribution aperture according to design parameters, and realizing the steam injection amount control of each steam injection layer by using a wellhead steam distribution device. The method reduces the interlayer contradiction in the steam injection process, improves the air suction profile, further improves the oil well yield and the oil well longitudinal exploitation degree, and is an important method for improving the recovery ratio of the heavy oil reservoir.
the layered steam injection technology is that according to the self-heterogeneity of an oil reservoir, the oil reservoir is divided into a single sealing unit and a plurality of sealing units by utilizing the combined operation of tools such as a packer, a high-temperature sealing assembly, a steam injection compensator, a wellhead adjusting device and the like. Reasonable steam injection parameters are designed by combining the physical properties of the reservoir. And designing a corresponding oil layer steam distribution device according to the parameters, and realizing the accurate control of the steam injection quantity of each steam injection unit by using the wellhead steam distribution device.
Current classification by primary stratification technique
1. Layering and quantifying technology: the layered quantitative technology is characterized in that firstly, steam is injected into one steam injection unit through a steam injection valve, and then a ball is thrown to close the steam injection unit and inject the other unit after the designed amount is reached.
2. A layered steam distribution technology: the layered steam distribution technology is to divide the oil layer in one well section into 2-3 steam injection units for steam injection, and the steam injection amount of each steam injection unit is regulated by a distributor to realize layered steam injection.
Brief introduction of concentric tube multi-layer steam injection process for steam injection well and composition thereof
The multi-layer steam injection of the steam injection well is to divide injected steam through a thermal recovery well head device so that the steam flows in through a fixed channel. Two steam injection channels are formed in the shaft in a mode that a large pipe is sleeved with a small pipe, the large pipe realizes steam injection of an upper oil layer through a high-temperature packer and a steam injection compensator, and the small pipe realizes steam injection of a lower part through a high-temperature suspension packer and a high-pressure sealing assembly. The combination of the layered steam injection well mouth, the upper steam injection unit and the lower steam injection unit adjusts the steam injection allocation of each layer to form reasonable injection allocation of different layers.
High-pressure sealing assembly: the high-pressure airtight assembly adopts multistage sealing and multi-element tungsten alloy special treatment technology, and mainly solves the problems that impurities, tube wall scaling and the like are contained in steam in a long-term high-temperature steam injection process, so that the abrasion of a sealing element is enhanced, the movable sealing cannot be completed to a certain degree when the sealing element is damaged, the sealing effect is reduced, and the service life is further influenced. The high-pressure seal assembly adopts multi-stage sealing and is inserted into the surface of a pipe column to carry out special treatment of multi-element tungsten alloy, thereby avoiding the poor sealing caused by the corrosion of the pipe column structure, influencing the layered steam injection effect and the effective period and improving the steam injection effect.
High-temperature hanging of the packer: the high-temperature suspension packer comprises a central pipe, an expansion body, a locking block, a hydraulic cylinder and the like, the hydraulic cylinder moves to open a slip by utilizing the water conservancy pushing action, and suspension setting is realized in a sleeve. The central tube and the expansion body form a telescopic tube structure, and the thermal compensation can be improved for the steam injection pipe column. The design of the backflow groove outside the central pipe successfully avoids the induced flow factor of the tool lifting operation on the bottom hole pressure, and ensures the safety of the construction operation.
Normally closed steam injection compensator: after steam injection is finished, the pipe column can shrink from top to bottom due to the action of expansion with heat and contraction with cold, the packer can not be unsealed synchronously, the steam injection pipe column can forcibly drive the packer to move upwards, the generated consequence is serious, and the disconnection, necking down, dislocation and the like of the steam injection pipe column can be caused. The normally closed steam injection compensator is always in a closed state when steam is injected, and only when the steam injection is stopped, the steam injection pipe column is cooled and contracted to generate pulling force to open the pipe column for compensating the contraction length.
Concentric injection allocator: the concentric injection allocation device is composed of an injection allocation device main body and a sliding sleeve, steam injection aperture and steam injection quantity are obtained by layered steam injection software through simulation, analysis and calculation according to geological conditions, the sliding sleeve seals a steam injection aperture nozzle through a packing, when pressure rises to a certain degree, the sliding sleeve falls under the action of the pressure, the steam injection nozzle is exposed, and injection allocation is realized.
Orifice plate flowmeter: the orifice plate flowmeter integrates temperature, pressure and flow signals into a whole by a brand-new design concept, and outputs the three signals after mixing processing through the intelligent digital processor, thereby realizing the implementation and detection of steam. The temperature of the medium can be measured to be between 35 ℃ below zero and 350 ℃, the pressure is 25MPa, and the device has the characteristics of compact structure and convenience in installation, use and maintenance.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A concentric tube multi-layer steam injection system for a steam injection well, comprising: the oil well casing pipe, the small cross pipe I, the small cross pipe II, the large cross pipe, the inner tubing hanger, the pressure gauge I, the orifice plate flowmeter I, the steam built-in regulating valve I, the pressure gauge II, the orifice plate flowmeter II, the steam built-in regulating valve II, the outer tubing hanger, the high-temperature packer I, the concentric injection distributor I, the high-temperature packer II, the concentric injection distributor II, the high-pressure sealing assembly, the suspended packer sealing assembly, the concentric injection distributor III, the high-temperature packer III and the concentric injection distributor IV are characterized in that the small cross pipe I is arranged at the upper end of the oil well casing pipe, the small cross pipe II and the large cross pipe are sequentially arranged on the oil well casing pipe at the lower end of the small cross pipe I, the pressure gauge I, the orifice plate flowmeter I and the steam built-in regulating valve I are sequentially arranged on the pipeline at one side of the small cross pipe II, the pressure gauge II, the orifice plate flowmeter II and the steam built-in, the upper end of the inner tubing hanger is arranged in the oil well casing between the small four-way I and the small four-way II, the upper end of the outer tubing hanger is arranged in the oil well casing between the small four-way II and the large four-way II, the inner tubing hanger is arranged in the outer tubing hanger, the lower part of the oil well casing is sequentially provided with a high-temperature packer I and a high-temperature packer II, the high-pressure packer comprises a high-pressure sealing assembly, a hanging packer sealing assembly and a high-temperature packer III, wherein a concentric injection allocation device I is arranged between the high-temperature packer I and the high-temperature packer II for oil layer position and outer oil pipe hanging, a concentric injection allocation device II is arranged between the high-temperature packer II and the high-pressure sealing assembly for oil layer position and outer oil pipe hanging, a concentric injection allocation device III is arranged between the hanging packer sealing assembly and the high-temperature packer III for oil layer position and inner oil pipe hanging, and a concentric injection allocation device IV is arranged at the lower part of the high-temperature packer III for oil layer position and inner oil pipe hanging.
2. The concentric tube multilayer steam injection system of a steam injection well according to claim 1, wherein the first orifice plate flowmeter, the second orifice plate flowmeter, the first steam built-in regulating valve and the second steam built-in regulating valve are all connected by flanges.
3. The concentric tube multilayer steam injection system of a steam injection well according to claim 1, wherein the inner tubing hanger, the outer tubing hanger, the first high-temperature packer, the first concentric injection allocator, the second high-temperature packer, the second concentric injection allocator, the high-pressure sealing assembly, the suspended packer sealing assembly, the third concentric injection allocator, the third high-temperature packer and the fourth concentric injection allocator are all connected by tubing threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910851389.3A CN110552672B (en) | 2019-09-10 | 2019-09-10 | Concentric tube multilayer steam injection system of steam injection well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910851389.3A CN110552672B (en) | 2019-09-10 | 2019-09-10 | Concentric tube multilayer steam injection system of steam injection well |
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| Publication Number | Publication Date |
|---|---|
| CN110552672A true CN110552672A (en) | 2019-12-10 |
| CN110552672B CN110552672B (en) | 2021-09-28 |
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| CN201910851389.3A Expired - Fee Related CN110552672B (en) | 2019-09-10 | 2019-09-10 | Concentric tube multilayer steam injection system of steam injection well |
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|---|---|---|---|---|
| EP0970728A2 (en) * | 1998-07-07 | 2000-01-12 | Plexus, LLC | Wheel assembly for in-line roller skates |
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-
2019
- 2019-09-10 CN CN201910851389.3A patent/CN110552672B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0970728A2 (en) * | 1998-07-07 | 2000-01-12 | Plexus, LLC | Wheel assembly for in-line roller skates |
| CN102102506A (en) * | 2010-12-22 | 2011-06-22 | 中国石油天然气集团公司 | Fire flooding oil extraction layered steam injection method and separate injection tubular column adopted by same |
| CN103806882A (en) * | 2012-11-02 | 2014-05-21 | 景丽百合 | Method and device for gas-lift liquid mining |
| CN202956353U (en) * | 2012-11-26 | 2013-05-29 | 中国石油天然气股份有限公司 | Experimental device for annular medium heat insulation effect of hot water drive oil production shaft |
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Non-Patent Citations (3)
| Title |
|---|
| 刘兴君等: "聚合物驱分层注入技术的开发与应用", 《中国石油和化工》 * |
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