Transverse plugging and mining edge water drive flow field transformation structure
By adopting the transformation structure of a horizontal blocking water drive field in the water collection, chemical blocks and curing blocks are used to form a blocking area belt, which solves the problem of imbalance of water body energy in the edge water collection. The balanced use of oil collection improves the water control effect of oil wells and oilfield development effects.
Patent Information
- Application Number
- CN202420950196.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-04-30
AI Technical Summary
During the development of the border water reservoir, due to the heterogeneous physical properties of the reservoir, local hyperosmotic zone and large pores, the edge water bounces and water traversal phenomena. The oil wells have early water sees water, a short period of unwatered oil production, and the water content rises quickly, which affects the oil wells. The development effect is, and the energy of water bodies in different directions is unbalanced, resulting in an uneven degree of overall plane mobility of the reservoir.
Adopt the transformation structure of horizontal plugging water drivefields, set up at least one first well in the collection area, and form a blocking area belt on one side of its side. The blocking mode is performed to form a horizontal blocking mode, weakening or preventering the horizontal drive of the water body, and balanced water body energy in different directions.
By transforming the edge waterflow field through the horizontal blocking mode, weaken or prevents the transverse driving of the water body, inhibit the energy body energy of the high water -containing area, enhance the degree of use of the direction of the weak energy water body, and achieve a greater balanced use of the water collection. Improve the water control effect of oil wells and oilfield development effects.
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Figure CN222391375U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil and gas exploitation, in particular to a transverse plugging and exploitation edge water drive flow field transformation structure. Background Art
[0002] During the development of edge water reservoirs, edge water can provide sufficient energy sources for reservoir development. However, due to the strong heterogeneity of reservoir physical properties, local high permeability zones and large pores, edge water intrusion and water channeling will occur during the development process, causing early water breakthrough in oil wells, short water-free oil production period, and rapid increase in water content, which affects the development effect of oil wells. At the same time, there are differences in water body energy in different directions of edge water reservoirs, especially in reservoirs with lithologic pinch-out. The water body energy in different directions is unbalanced. If the water body energy is strong, the utilization degree is high, and a flooded area with high water content is formed first; if the water body energy is low, the utilization degree is low, and there is a dead oil area, resulting in an uneven utilization degree of the overall plane of the reservoir, which seriously affects the development effect of edge water reservoirs and is very unfavorable to oilfield development.
[0003] Conventional water plugging modes generally plug water in the original wellbore, such as chemical or mechanical water plugging in the original wellbore of horizontal wells and directional wells, which is limited to plug water in a small range near the wellbore, and cannot plug water in the formation, and cannot form a horizontal plugging mode on the plane. For example: chemical water plugging and mechanical water plugging can be used for horizontal well plugging, which is generally done on individual well sections in the wellbore, and the range is very limited; secondly, only plugging water in the wellbore of the horizontal well cannot form a strip-shaped shielding area inside the reservoir, cannot balance the difference in water energy in different directions of the edge water reservoir, and cannot shield the flooded area with high recovery degree and high water content, which will cause rapid water seepage in the new well, and the low water energy area cannot be effectively used, and even form a dead oil area, and the overall plane utilization of the reservoir is uneven. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a lateral plugging and production edge water drive flow field transformation structure for achieving water control and oil increase.
[0005] The technical solution adopted by the utility model to solve the technical problem is: to provide a lateral plugging and edge water flooding flow field transformation structure, including at least one first well arranged in the reservoir area, a plugging zone formed by lateral expansion on at least one side of the first well to plug the edge water, and a solid plugging agent plugged in the wellbore of the first well;
[0006] The plugging zone is formed by a permeable zone and a chemical plugging agent plugged in the permeable zone; the solidified plugging agent plugs the wellbore to form a plugging section.
[0007] In some embodiments, the permeable zone comprises a high permeability zone and / or macropores.
[0008] In some embodiments, the lateral plugging and production edge water drive flow field transformation structure further includes at least one second well, and the second well is located on a side of the first well away from the edge water in the reservoir area.
[0009] In some embodiments, the first well is a horizontal well, and the second well is a horizontal well or a directional well.
[0010] In some embodiments, when the first well is a horizontal well and the second well is a horizontal well, the second well is connected to the wellbore root of the first well.
[0011] In some embodiments, the first well is a directional well, and the second well is a horizontal well or a directional well.
[0012] In some embodiments, at least one of the first well and the second well is a branch well.
[0013] In some embodiments, when the first well is a horizontal well, the plugging section is a strip extending in the transverse direction.
[0014] In some embodiments, the first well is a directional well chamber, and the plugging section is a strip extending in the longitudinal direction.
[0015] In some embodiments, the lateral plugging and production edge water drive flow field transformation structure includes one first well and one or more second wells.
[0016] In some embodiments, the lateral plugging and production edge water drive flow field transformation structure includes a plurality of the first wells and one second well.
[0017] In some embodiments, the lateral plugging and production edge water drive flow field transformation structure includes a plurality of the first wells and a plurality of the second wells.
[0018] The beneficial effects of the utility model are as follows: the edge water flow field is transformed in a lateral plugging and production mode, which is suitable for edge water drive oil reservoirs dominated by lateral displacement or bottom water oil reservoirs with developed interlayers and barriers. Chemical plugging agents and solidifying plugging agents are successively injected into the well to seal the reservoir and the wellbore respectively, and the edge water drive flow field is transformed in a lateral plugging and production mode to weaken or prevent lateral displacement of water bodies, which can not only suppress the relatively high-energy water bodies in the high-water-content zone, but also enhance the degree of utilization of the direction of relatively weak-energy water bodies, thereby achieving a greater degree of balanced utilization of lateral displacement oil reservoirs, which can not only have a good water control and oil-increasing effect on the oil wells, but also improve the effect of oil field development. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0020] Figure 1It is a structural schematic diagram of the utility model of the horizontal plugging and production edge water drive flow field transformation structure in a homogeneous reservoir;
[0021] Figure 2 It is a structural schematic diagram of the utility model of the horizontal plugging and production edge water drive flow field transformation structure in a heterogeneous reservoir;
[0022] Figure 3 It is a structural schematic diagram of the horizontal blocking and mining edge water drive flow field transformation structure of the first embodiment of the utility model;
[0023] Figure 4 It is a structural schematic diagram of a transverse blocking and mining edge water drive flow field transformation structure of the second embodiment of the utility model;
[0024] Figure 5 It is a structural schematic diagram of a transverse blocking and mining edge water drive flow field transformation structure of the third embodiment of the utility model;
[0025] Figure 6 It is a structural schematic diagram of a transverse blocking and mining edge water drive flow field transformation structure of the fourth embodiment of the utility model. DETAILED DESCRIPTION
[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.
[0027] refer to Figure 1 and Figure 2 The lateral plugging and production edge water drive flow field transformation structure of the utility model is formed in the oil reservoir area. The lateral plugging and production edge water drive flow field transformation structure may include at least one first well 100, at least one second well 200, a plugging zone 10 and a plugging section 20 arranged in the oil reservoir area.
[0028] The oil reservoir region is preferably an oil reservoir region with high water content.
[0029] Among them, the first well 100 is used as a plugging well, and the plugging zone 10 is formed on at least one side of the first well 100 with a lateral extension, which is used to plug the edge water and weaken or prevent the lateral displacement of the water body. The plugging zone 10 is formed by the permeable zone in the reservoir and the chemical plugging agent plugged in the permeable zone; the permeable zone includes a high permeability zone and / or a large pore. The formation of the plugging zone 10 transforms the physical distribution of the reservoir, forms a relatively low permeability zone, and blocks the edge water intrusion or water channeling caused by the high permeability zone / large pore. The plugging section 20 is formed by the wellbore of the first well 100 and the solidified plugging agent plugged in the wellbore, which is used to prevent the water body from channeling in the wellbore. The plugging section 20 can block the water body energy in the high-production flooded area, suppress the high-energy water body, increase the degree of mobilization in the direction of the weak energy water body, transform the reservoir flow field, and realize the overall balanced mobilization of the edge water reservoir. The second well 200 is used as a production well and is set on the side of the first well 100 away from the edge water.
[0030] Specifically, the length of the blocking zone 10 is preferably 5 meters or more. The formation of the blocking zone 10 further blocks the high water content zone 11 formed by the edge water.
[0031] The chemical plugging agent is injected into the first well 100 at high pressure through the drill pipe, and enters the permeable zone of the reservoir through the first well 100. Under a certain injection pressure, the chemical plugging agent expands laterally (horizontally), preferably entering the high permeability zone and / or large pores in the reservoir to form a plug. The viscosity and injection speed of the chemical plugging agent are adjusted according to the permeability of the permeable zone. According to the permeability and other properties of the permeable zone, the injection method of the chemical plugging agent is continuous injection and / or water displacement injection to achieve maximum expansion of the chemical plugging agent in the lateral direction.
[0032] The chemical plugging agent is a gel-worm system solution, which is required to have the properties of being able to penetrate into the reservoir, stable performance, and effective plugging. In some embodiments, the raw materials of the gel-worm system solution include seawater and gel-worm agent, which can be prepared by using a corresponding mass ratio of seawater and gel-worm agent according to the required viscosity.
[0033] For the plugging section 20, a solidifying plugging agent is injected into the wellbore of the first well 100 through a drill pipe for solidification. The solidifying plugging agent has strong coagulation properties and solidifies in the wellbore to achieve plugging and prevent water from flowing into the wellbore. The solidifying plugging agent is a solidification system solution, which is required to have high strength after solidification and can achieve an effective plugging effect. In some embodiments, the raw materials of the solidification system solution include fresh water and pre-crosslinked particle gelling agent. During preparation, fresh water and pre-crosslinked particle gelling agent are mixed and prepared in a required mass ratio.
[0034] Further, according to the characteristics of the reservoir, it includes two types of reservoirs: homogeneous and heterogeneous. For a homogeneous reservoir, the high water content zone 11 outside the first well 100 generally also presents a regular shape, such as Figure 1 As shown in the figure, for heterogeneous reservoirs, the causes of heterogeneity include differences in physical properties or development of fractures, etc. The characteristics of the high water-content zone 11 vary due to the heterogeneous development characteristics of the formation, and the shape has irregular characteristics. There may be multiple high water-content zones 11, such as Figure 2 shown.
[0035] Further, in the present invention, the first well 100 is a horizontal well, and the second well 200 is a horizontal well or a directional well; or, the first well 100 is a directional well, and the second well 200 is a horizontal well or a directional well. Alternatively, at least one of the first well 100 and the second well 200 is a branch well.
[0036] The first well 100 and the second well 200 may be arranged in the same well (sharing a wellhead) or in different wells.
[0037] The lateral plugging and production edge water drive flow field transformation structure of the utility model may include a first well 100 and one or more second wells 200, or include multiple first wells 100 and one second well 200, or include multiple first wells 100 and multiple second wells 200. According to the number of the first well 100 and the second well 200, the following modes can be realized: one plugging and one production, one plugging and multiple productions, multiple plugging and one production, and multiple plugging and multiple productions.
[0038] The first well 100 and the second well 200 can be used as a plugging and production well group, and can share a wellhead, which is a plugging and production combination of different branches in the same well: 1 branch plugging 1 branch production, 1 branch plugging multiple branches production, multiple branches plugging 1 branch production, and multiple branches plugging multiple branches production. The first well 100 and the second well 200 can also be relatively independent wells as a plugging and production well group. For example, when the first well 100 is a horizontal well and the second well 200 is a horizontal well, the second well 200 is side-drilled from the wellbore root of the first well 100, so that the second well 200 is connected to the wellbore root of the first well 100.
[0039] refer to Figure 3 In the first embodiment of the utility model, the first well 100 is a directional well, and the chemical plugging agent injected under high pressure expands into the reservoir in the horizontal direction to form a plugging zone 10 to plug the edge water. The formation of the plugging zone 10 further plugs the high water-containing zone 11 formed by the edge water. The solidified plugging agent solidifies in the wellbore of the first well 100 to form a plugging section 20 in the form of a strip in the vertical direction.
[0040] The second well 200 is disposed on a side of the first well 100 away from the high water content zone 11 as a production well. In this embodiment, the second well 200 is a directional well.
[0041] refer to Figure 4 In the second embodiment of the utility model, the first well 100 is a horizontal well, and the chemical plugging agent injected under high pressure expands into the reservoir in the horizontal direction to form a plugging zone 10 to plug the edge water. The formation of the plugging zone 10 makes at least one side of the first well 100 have a high water-containing zone 11 formed after being displaced by the water body. The solidified plugging agent solidifies in the wellbore of the first well 100 to form a plugging section 20 in the form of a strip in the horizontal direction.
[0042] The second well 200 is disposed on a side of the first well 100 away from the high water content zone 11 as a production well. In this embodiment, the second well 200 is a directional well.
[0043] refer to Figure 5In the third embodiment of the utility model, the first well 100 is a directional well, and the chemical plugging agent injected under high pressure expands into the reservoir in the horizontal direction to form a plugging zone 10 to plug the edge water. The formation of the plugging zone 10 further plugs the high water-containing zone 11 formed by the edge water. The solidified plugging agent solidifies in the wellbore of the first well 100 to form a plugging section 20 in the form of a strip in the vertical direction.
[0044] The second well 200 is disposed on a side of the first well 100 away from the high water content zone 11 as a production well. In this embodiment, the second well 200 is a horizontal well.
[0045] refer to Figure 6 In the fourth embodiment of the utility model, the first well 100 is a horizontal well, and the chemical plugging agent injected under high pressure expands into the reservoir in the horizontal direction to form a plugging zone 10 to plug the edge water. The formation of the plugging zone 10 further plugs the high water-containing zone 11 formed by the edge water. The solidified plugging agent solidifies in the wellbore of the first well 100 to form a plugging section 20 in the form of a strip in the horizontal direction.
[0046] The second well 200 is disposed on a side of the first well 100 away from the high water content zone 11 as a production well. In this embodiment, the second well 200 is a horizontal well.
[0047] The utility model is further described below through practical application.
[0048] In an edge water reservoir with strong heterogeneity and large energy differences of water bodies in different directions, the oil layer thickness is 7 meters, the crude oil viscosity is 3.5 centipoise, and the average permeability is 200mD.
[0049] First, the colloid system solution is injected at high pressure through the original wellbore of the existing horizontal well (i.e., the first well 100), so that the colloid system solution enters the high permeability zone and large pores inside the reservoir to form a plug. Then, the solidifying plugging agent is injected into the original wellbore of the horizontal well, and after solidification, a strip-shaped plugging section is formed inside the reservoir to block the high-energy water body in the high-production flooded area and prevent the water content of the new well from rising too fast.
[0050] Then, a new MRC branch horizontal well (i.e., the second well 200) was drilled in an area with weaker water energy and lower utilization, and put into production after completion. The cumulative production of a single well was 62,000 cubic meters, an increase of 50,000 cubic meters compared with no plugging agent injection, and the initial water content was reduced by 30%.
[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A lateral plugging and mining edge water drive flow field transformation structure, characterized in that: The method comprises at least one first well arranged in an oil reservoir area, a plugging zone formed by lateral expansion on at least one side of the first well to plug edge water, and a solidifying plugging agent plugged in a wellbore of the first well; The plugging zone is formed by a permeable zone and a chemical plugging agent plugged in the permeable zone; the solidified plugging agent plugs the wellbore to form a plugging section.
2. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 1 is characterized in that: The permeable zone includes a high permeability zone and / or macropores.
3. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 1 is characterized in that: The lateral plugging and production edge water drive flow field transformation structure further comprises at least one second well, wherein the second well is located on a side of the first well away from the edge water in the reservoir area.
4. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 3 is characterized in that: The first well is a horizontal well, and the second well is a horizontal well or a directional well.
5. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 3 is characterized in that: The first well is a directional well, and the second well is a horizontal well or a directional well; or, At least one of the first well and the second well is a branch well.
6. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 1 is characterized in that: When the first well is a horizontal well, the plugging section is a strip extending in the transverse direction.
7. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 1 is characterized in that: When the first well is a directional well, the plugging section is a strip extending in the longitudinal direction.
8. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 3 is characterized in that: The lateral plugging and production edge water drive flow field transformation structure includes one first well and one or more second wells.
9. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 3 is characterized in that: The lateral plugging and production edge water drive flow field transformation structure includes a plurality of the first wells and one second well.
10. The lateral water flooding flow field transformation structure for blocking the mining edge according to claim 3 is characterized in that: The lateral plugging and production edge water drive flow field transformation structure includes a plurality of the first wells and a plurality of the second wells.