CN213574047U - Vertical type blocking mining mode three-dimensional excavation and submerging structure - Google Patents

Abstract

The utility model discloses a vertical plugging and mining mode three-dimensional excavation and submergence structure, which comprises at least one first well arranged in an oil reservoir area; the first well comprises an upper well section located in an upper portion of the reservoir region, a lower well section located in a lower portion of the reservoir region and above an oil-water interface; the lower well section is communicated with at least one first branch; and the first branch is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface. The utility model discloses a three-dimensional latent structure of digging of stifled mode of adopting of vertical formula sets up branch and injects the stifled agent through the well section down, forms the seal interlayer that is located position more than oil reservoir lower part, the oil water interface, conveniently produces (oil recovery) on the well drilling, vertically upward forms stifled system of adopting, improves the oil reservoir recovery ratio.

Description

Vertical type blocking mining mode three-dimensional excavation and submerging structure

Technical Field

The utility model relates to an oil and natural gas exploitation technical field especially relates to a vertical type blocks up adopts three-dimensional structure of diving of mode.

Background

In the process of bottom water reservoir development, the bottom water can provide sufficient energy sources for the reservoir development, and the oil well has earlier water breakthrough and short waterless oil extraction period due to coning and ridge advancing of the bottom water; after the oil well is flooded, the water content is rapidly increased, and the oil yield is rapidly reduced. In addition, for the development of the marginal water reservoir, a secondary bottom water reservoir is likely to be formed by the later development stage, and similar problems are faced. Therefore, bottom water coning and ridge entering are very unfavorable for reservoir exploitation.

The conventional water plugging mode is generally used for plugging water in an original well bore, such as chemical or mechanical water plugging in the original well bore of a horizontal well and a directional well, but the conventional water plugging mode is only limited to water plugging in a smaller range near a well bore, cannot deeply plug water in a stratum, and has no concept and mode of three-dimensional plugging and excavation. For example: the horizontal well water plugging can adopt chemical water plugging and mechanical water plugging, and generally, the water plugging is carried out on individual well sections in a shaft, so that the range is very limited; the water plugging of the directional well is mostly realized by injecting a chemical plugging agent into an original well hole, only a partition plate in a small range can be formed, the rising of bottom water is limited to a certain extent, the effective range is small, the time is short, the shape of the partition plate cannot be effectively controlled due to the heterogeneity of an oil reservoir, the bottom water easily flows around, and the water-resisting effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a vertical stifled mode of adopting three-dimensional latent structure of digging of formula that improves the oil reservoir recovery ratio.

The utility model provides a technical scheme that its technical problem adopted is: the vertical plugging and production mode three-dimensional underground excavation structure comprises at least one first well arranged in an oil reservoir area; the first well comprises an upper well section located in an upper portion of the reservoir region, a lower well section located in a lower portion of the reservoir region and above an oil-water interface;

the lower well section is communicated with at least one first branch; and the first branch is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface.

Preferably, the first well is a directional well; the first branches take the directional well as the center and transversely extend towards the periphery of the directional well respectively.

Preferably, the radius of curvature of the first branch is 1-10 m.

Preferably, the lateral length of the first leg is greater than the drainage radius of the directional well.

Preferably, the upper well section of the first well is provided with at least one second branch communicated with the upper well section; the second branch is located above the first branch.

Preferably, the radius of curvature of the second branch is 1.5-1.8 m.

Preferably, the vertical plug-and-production mode solid excavation structure further comprises a second well adjacent to the first well; the second well is located above the packer layer.

Preferably, the first well is a horizontal well; the first branch is in communication with and located below the horizontal downhole well section.

The utility model also provides another vertical plugging and mining mode three-dimensional excavation and submergence structure, which comprises a first well and a horizontal well which are arranged in an oil reservoir area; the horizontal well is adjacent the first well and a lower leg of the horizontal well extends below the first well in a lower portion of the reservoir region;

and the horizontal well is filled with a plugging agent, so that a bottom water blocking layer is formed above an oil-water interface.

Preferably, the first well is a directional well or a horizontal well.

The utility model discloses a three-dimensional latent structure of digging of stifled mode of adopting of vertical formula sets up branch and injects into stifled agent through the well section under, forms the packer layer that is located position more than oil reservoir lower part, the oil water interface, conveniently produces (oil recovery) at last well section, vertically upward forms stifled system of adopting, improves the oil reservoir recovery ratio.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic view of a vertical blocking mining mode three-dimensional excavation and submerging structure according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a vertical blocking mining mode three-dimensional excavation structure according to a second embodiment of the present invention;

FIG. 3 is a schematic view of a vertical blocking mining mode three-dimensional excavation and submerging structure according to a third embodiment of the present invention;

fig. 4 is a schematic view of a vertical blocking mining mode three-dimensional excavation structure according to a fourth embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The utility model discloses a three-dimensional method of diving of vertical stifled mode of adopting mainly is applicable to the bottom water oil reservoir and is in the marginal water oil reservoir that development later stage formed secondary bottom water.

As shown in fig. 1, the vertical plugging and production mode three-dimensional excavation and submerging structure of the first embodiment of the invention comprises at least onefirst well 3 arranged in anoil reservoir area 1; thefirst well 3 comprises an upper well section located in the upper part of thereservoir region 1 and a lower well section located in the lower part of thereservoir region 1 above the oil-water interface 2.

The lower well section is communicated with at least onefirst branch 4; thefirst branch 4 is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface 2. Plugging agent is also injected into the downhole section of the directional well to which thefirst branch 4 communicates.

In this embodiment, thefirst well 3 is a directional well. For the arrangement of the plurality offirst branches 4, the plurality offirst branches 4 are centered on the directional well and laterally extended toward the periphery of the directional well, respectively, so that the plurality offirst branches 4 may be or substantially may be distributed over the entire peripheral area of the directional well in the horizontal direction.

Thefirst branch 4 is drilled with a low-curvature drilling. The radius of curvature of thefirst branch 4 is 1.5-1.8 m. The lateral length of thefirst branch 4 is as long as possible, depending on the operating capacity, preferably larger than the drainage radius of the directional well.

Due to the formation of the sealing layer, the bottom water blocking effect is achieved for the oil extraction work of the directional well, and the recovery rate is improved. In addition, in order to increase the production capacity, the upper well section of thefirst well 3 is provided with at least onesecond branch 5 communicated with the upper well section; thesecond branch 5 is located above thefirst branch 4 and in the upper part of thereservoir region 1.

Thesecond branch 5 may also be drilled with a small-curvature drill with a radius of curvature of 1-10m, more preferably 1.5-1.8 m.

When the vertical plugging and production mode three-dimensional excavation and submerging structure works, oil production is carried out on the upper well section of the directional well. The oil production can be carried out after thefirst branch 4 of the lower well section is injected with the plugging agent, or the oil production is carried out while the plugging agent is injected, or the plugging agent is injected into thefirst branch 4 after the oil production is carried out for a period of time at the upper well section, and then the oil production is carried out continuously at the upper well section.

As shown in fig. 2, the vertical plugging and production mode solid submergence excavation structure according to the second embodiment of the present invention includes at least one first well 3 disposed in thereservoir region 1, and asecond well 6 adjacent to thefirst well 3. Thefirst well 3 comprises an upper well section located in the upper part of thereservoir region 1 and a lower well section located in the lower part of thereservoir region 1 and above the oil-water interface 2.

The lower well section is communicated with at least onefirst branch 4; thefirst branch 4 is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface 2. Plugging agent is also injected into the lower wellbore section to which thefirst branch 4 communicates. Thesecond well 6 is located above the packer layer.

For the arrangement of the plurality offirst branches 4, the plurality offirst branches 4 are centered on the directional well and laterally extended toward the periphery of the directional well, respectively, so that the plurality offirst branches 4 may be or substantially may be distributed over the entire peripheral area of the directional well in the horizontal direction. Thefirst branch 4 is drilled with a low-curvature drilling. The radius of curvature of thefirst branch 4 is 1-10m, preferably 1.5-1.8 m. The lateral length of thefirst branch 4 is as long as possible, depending on the operating capacity, preferably larger than the drainage radius of the directional well.

Thesecond well 6 is positioned above the sealing layer formed by thefirst branch 4 and the plugging agent, so that the sealing layer has the function of blocking bottom water for thesecond well 6, and the recovery ratio is improved.

In this embodiment, thefirst well 3 is a directional well. Thesecond well 6 may be a directional well or a horizontal well, etc., on which a branch may also be placed to increase productivity.

When the vertical plugging and production mode three-dimensional excavation and submerging structure works, oil production is carried out in thesecond well 6. The production may be performed after the injection of the plugging agent into thefirst branch 4 of thefirst well 3, or the production may be performed while the injection of the plugging agent is performed, or the plugging agent may be injected into thefirst branch 4 of thefirst well 3 after the production in thesecond well 6 has been performed for a period of time, and then the production may be continued in thesecond well 6.

As shown in fig. 3, the vertical plugging and production mode three-dimensional excavation structure of the third embodiment of the present invention includes at least onefirst well 3 disposed in thereservoir region 1. Thefirst well 3 comprises an upper well section located in the upper part of thereservoir region 1 and a lower well section located in the lower part of thereservoir region 1 and above the oil-water interface 2.

The lower well section is communicated with at least onefirst branch 4; thefirst branch 4 is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface 2.

In this embodiment, thefirst well 3 is a horizontal well; thefirst branch 4 is in communication with and located below the horizontal downhole well section. The lower section of the horizontal well may have one or morewell branches 7; thefirst branch 4 is located below thewell branch 7.

The horizontal extension of thefirst branch 4 is preferably equal to or greater than the extension of thewell branch 7.

When the vertical plugging and mining mode three-dimensional excavation and submerging structure works, oil extraction production is carried out on the horizontal well. The oil production can be carried out after the plugging agent is injected into thefirst branch 4, or the oil production can be carried out while the plugging agent is injected, or the plugging agent can be injected into thefirst branch 4 after the horizontal well is produced for a period of time, and then the oil production can be carried out in the horizontal well continuously.

As shown in fig. 4, the vertical plugging and production mode three-dimensional excavation structure of the fourth embodiment of the present invention includes afirst well 8 and ahorizontal well 9 disposed in theoil reservoir region 1. Ahorizontal well 9 is adjacent thefirst well 8 and the lower end of thehorizontal well 9 extends below thefirst well 8 in the lower part of thereservoir zone 1.

Thehorizontal well 9 is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface 2.

In this embodiment, thefirst well 8 is a directional well or a horizontal well.

Thehorizontal well 9 forms a sealing layer through the injection of the plugging agent, plays a role in blocking bottom water for thefirst well 8 above the horizontal well, and improves the recovery ratio of the first well.

In addition, at least onebranch 10 may be provided in thefirst well 8 in order to increase the production capacity. Thebranches 10 may be drilled with a small-curvature drill with a radius of curvature of 1-10m, more preferably 1.5-1.8 m.

When the vertical plugging and production mode three-dimensional underground excavation structure works, oil production is carried out in thefirst well 8. The oil production can be carried out after the plugging agent is injected into thehorizontal well 9, or the oil production can be carried out while the plugging agent is injected, or the plugging agent is injected into thehorizontal well 9 after thefirst well 8 is produced for a period of time, and then the oil production is carried out continuously in thefirst well 8.

In addition, in the vertical plug-and-production mode three-dimensional excavation structure of each of the above embodiments, depending on the actual condition of the formation, for example, at least one of fractures, vugs and caverns, when the plugging agent is injected, the plugging agent also enters the fractures, vugs and/or caverns in the lower portion of thereservoir region 1 to plug them.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A vertical plugging and production mode three-dimensional underground excavation structure is characterized by comprising at least one first well arranged in an oil reservoir area; the first well comprises an upper well section located in an upper portion of the reservoir region, a lower well section located in a lower portion of the reservoir region and above an oil-water interface;

the lower well section is communicated with at least one first branch; and the first branch is filled with a plugging agent, so that a bottom water blocking layer is formed above the oil-water interface.

2. The vertical plug-and-production mode solid excavation structure of claim 1, wherein the first well is a directional well; the first branches take the directional well as the center and transversely extend towards the periphery of the directional well respectively.

3. The vertical plug-mining mode solid excavation structure according to claim 2, wherein the radius of curvature of the first branch is 1.5-1.8 m.

4. The vertical plug-and-production mode solid excavation structure of claim 2, wherein the lateral length of the first branch is greater than a drainage radius of the directional well.

5. The vertical plug-and-production mode solid excavation structure of claim 2, wherein the upper well section of the first well is provided with at least one second branch communicated with the upper well section; the second branch is located above the first branch.

6. The vertical plug-mining mode solid excavation structure of claim 5, wherein the radius of curvature of the second branch is 1-10 m.

7. The vertical plug-and-production mode sub-sea structure of claim 2, further comprising a second well adjacent to the first well; the second well is located above the packer layer.

8. The vertical plugging and mining mode three-dimensional underground excavation structure according to claim 1, wherein the first well is a horizontal well; the first branch is in communication with and located below the horizontal downhole well section.

9. A vertical plugging and mining mode three-dimensional excavation and submergence structure is characterized by comprising a first well and a horizontal well, wherein the first well and the horizontal well are arranged in an oil reservoir area; the horizontal well is adjacent the first well and a lower leg of the horizontal well extends below the first well in a lower portion of the reservoir region;

and the horizontal well is filled with a plugging agent, so that a bottom water blocking layer is formed above an oil-water interface.

10. The vertical plug-and-production mode solid excavation structure of claim 9, wherein the first well is a directional well or a horizontal well.

Images