Hole temporary plugging device for fracturing
By using rigid components and fluid fillers within an encapsulated body in a temporary plugging device for fracturing orifices, combined with an outer shell and a water-swellable layer, the problems of poor orifice sealing and detachment were solved, achieving stable sealing of irregular orifices and accurate introduction of fracturing fluid.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CNPC BOHAI DRILLING ENG
- Filing Date
- 2024-11-11
- Publication Date
- 2026-05-12
AI Technical Summary
Existing temporary plugging devices for perforations are ineffective and prone to falling off, especially in irregular perforations formed by projectiles, which prevents fracturing fluid from accurately entering the intended area.
The system employs a combination of rigid components and fluid fillers within the encapsulation. The rigid components are used for initial sealing, while the fillers deform under fluid pressure to fill irregular pores. The outer shell ruptures under a preset pressure to protect the encapsulation, and a water-swellable layer ensures the stability of the sealing.
It achieves stable and reliable sealing of irregularly shaped perforations, prevents the device from falling off, ensures that fracturing fluid enters the predetermined area, simplifies the operation process, and reduces construction complexity and cost.
Smart Images
Figure CN122012052A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of downhole operations technology in the petroleum industry, and in particular to a temporary plugging device for fracturing orifices. Background Technology
[0002] In oilfield development, fracturing technology is an important means to improve oil and gas recovery. However, during the fracturing process, effectively controlling fracture propagation and ensuring that fracturing fluid accurately enters the intended area have become key factors restricting fracturing effectiveness. Because the perforation shape, especially when using projectile perforation, is irregular, existing temporary plugging techniques are ineffective, and the plugging devices are prone to detachment, leading to accidental plugging of newly perforated perforations that have not yet been improved by fracturing. Summary of the Invention
[0003] The purpose of this invention is to provide a temporary plugging device for fracturing holes to solve the problems of poor sealing effect and easy detachment of existing temporary plugging devices.
[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:
[0005] A fracturing orifice temporary plugging device includes an encapsulation body and a rigid member, the rigid member being disposed within the encapsulation body, and the encapsulation body also containing a filler having fluidity.
[0006] Optionally, the package, the rigid member, and the filler are all made of a soluble material.
[0007] Furthermore, the filler includes at least one of soluble magnesium alloy particles, polyglycolic acid particles, plastic particles, quartz sand, silicone oil, and asphalt;
[0008] The package and the rigid component are made of polyhydroxyacetic acid.
[0009] Optionally, the package may be directly formed from a polymer, cotton, or linen, or woven from at least one of a polymer, cotton, or linen.
[0010] The rigid component is made of polymer or metal.
[0011] Furthermore, the rigid member is provided with at least one through groove that extends through itself, through which the filler can pass;
[0012] When there are multiple through slots, the through slots are interconnected.
[0013] Furthermore, the inner wall of the through groove is provided with a water-swellable layer.
[0014] Furthermore, the water-swellable layer can be made of sodium acrylate, cross-linked sodium acrylate composite resin, polyvinyl alcohol, polyurethane prepolymer, or a modified polyurethane prepolymer.
[0015] Furthermore, when the number of rigid components is one, the size of the rigid component is larger than the diameter of the perforation hole to block the perforation hole;
[0016] When there are multiple rigid components, at least one rigid component has a size larger than the diameter of the perforation hole, or at least one rigid component has a size larger than the diameter of the perforation hole and at least one rigid component has a size smaller than the diameter of the perforation hole.
[0017] Furthermore, the fracturing orifice temporary plugging device also includes a housing, the encapsulated body being disposed within the housing, and the housing rupturing under a preset pressure.
[0018] Furthermore, the outer casing is made of plastic, polyvinyl alcohol, or paper.
[0019] In summary, the technical effects achieved by this invention are as follows:
[0020] The fracturing orifice temporary plugging device provided by the present invention includes an encapsulation body and a rigid member. The rigid member is disposed in the encapsulation body, and the encapsulation body is also provided with a filler material that has fluidity.
[0021] The fracturing perforation temporary plugging device provided by this invention seals the perforation hole with a rigid component within the package and fills the remaining gaps with a filler to accommodate irregularly shaped perforations, thereby allowing the package to better fill the perforation hole. Specifically, the package is a flexible component that can deform under fluid pressure, allowing the filler to fully fill the portion of the perforation hole not sealed by the rigid component and to penetrate into the perforation hole to enhance its stability and prevent it from falling out. Therefore, the fracturing perforation temporary plugging device provided by this invention can stably and reliably seal irregularly shaped perforations. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure of the fracturing orifice temporary plugging device provided in an embodiment of the present invention;
[0024] Figure 2This is another structural schematic diagram of the fracturing orifice temporary plugging device provided in an embodiment of the present invention;
[0025] Figure 3 A schematic diagram of the structure for sealing the perforation hole;
[0026] Figure 4 Another structural diagram for sealing the perforation hole.
[0027] Icons: 100, Enclosure; 200, Rigid Component; 210, Through-slot; 300, Filler; 400, Outer Shell; 10, Perforation Hole. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0030] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0031] After perforation, especially when the perforation method is used to create irregular holes, the existing hole-plugging technology is not effective and the temporary plugging device is easy to fall off, resulting in the accidental plugging of newly opened holes that have not yet been cracked and improved.
[0032] In view of this, the present invention provides a temporary plugging device for fracturing holes, comprising an encapsulation body 100 and a rigid member 200, wherein the rigid member 200 is disposed within the encapsulation body 100 and a filler 300 is further disposed within the encapsulation body 100, the filler 300 having fluidity.
[0033] The fracturing perforation temporary plugging device provided by this invention seals the perforation orifice 10 with a rigid member 200 within an encapsulation 100, and seals the remaining gaps with a filler 300 to accommodate irregularly shaped perforation orifices 10, thereby allowing the encapsulation 100 to better fill the perforation orifice 10. Specifically, the encapsulation 100 is a flexible member that can deform under fluid pressure, allowing the filler 300 to fully fill the portion of the perforation orifice 10 not sealed by the rigid member 200, and to penetrate into the interior of the perforation orifice 10 to enhance its firmness and prevent it from falling out. Therefore, the fracturing perforation temporary plugging device provided by this invention can stably and reliably seal irregularly shaped perforation orifices 10.
[0034] The following combination Figures 1-4 The structure and shape of the fracturing orifice temporary plugging device provided in this embodiment are described in detail below:
[0035] In this embodiment, the fracturing orifice temporary plugging device includes an enclosure 100, a rigid member 200, a filler 300, and a shell 400. The rigid member 200 and the filler 300 are both disposed within the enclosure 100, and the enclosure 100 is disposed within the shell 400. Figure 1 As shown.
[0036] Specifically, the inclusion body 100 is configured as a flexible component, capable of undergoing significant deformation under fluid pressure, thereby better covering, filling, and sealing perforation holes 10 of various shapes during construction. The filler 300 is fluid to adapt to the shape changes of the inclusion body 100 and fill the perforation holes 10.
[0037] In this embodiment, the rigid member 200 can be configured as one or more to prevent the entire device from being submerged in the perforation hole 10, which would expose the formation to high-pressure fluid and cause the sealing to fail. When there is only one rigid member 200, the size of the rigid member 200 is larger than the diameter of the perforation hole 10 to seal the perforation hole 10. During sealing, the rigid member 200 is sealed outside the perforation hole 10.
[0038] When there are multiple rigid components 200, at least one rigid component 200 is larger than the diameter of the perforation hole 10, or at least one rigid component 200 is larger than the diameter of the perforation hole 10 and at least one rigid component 200 is smaller than the diameter of the perforation hole 10; that is, rigid components 200 larger than the diameter of the perforation hole 10 are placed outside the perforation hole 10, while smaller rigid components 200 are distributed around the larger rigid components 200 for auxiliary sealing, such as... Figure 3 As shown; or a smaller rigid component 200 enters the perforation orifice 10 to achieve multi-layer sealing and prevent the device from falling off and causing accidental blockage of the perforation orifice 10 that has not yet undergone fracturing improvement, such as Figure 4 As shown.
[0039] In this embodiment, the rigid component 200 can be configured as a sphere, an ellipsoid, or an irregular three-dimensional structure. A spherical structure is preferred because it has a uniform shape, stronger adaptability, and is more conducive to adapting to different shapes of perforations 10.
[0040] In this embodiment, the rigid member 200 is provided with at least one through groove 210 that penetrates itself, through which the filler 300 can pass. When there are multiple through grooves 210, they are interconnected. The through grooves 210, serving as flow channels for the filler 300, need to be configured according to the shape and size of the rigid member 200. When there are a large number of interconnected through grooves 210, it can prevent the filler 300 from being unable to pass through due to the blockage of a single through groove 210. When the rigid member 200 is a sphere, all the through grooves 210 pass through the center of the sphere. The through grooves 210 make it easier for the filler 300 to flow and for the package 100 to deform more easily, thereby better filling the unsealed gaps in the rigid member 200 and achieving reliable sealing. Each through groove 210 is usually a straight line, and the openings are distributed in different directions of the rigid member 200, making it easier for the filler 300 to pass through the through grooves 210.
[0041] In this embodiment, the inner wall of the through groove 210 is provided with a water-swellable layer. When water enters the through groove 210, the water-swellable layer expands slowly after encountering water to gradually block the through groove 210, thereby preventing the flow of the filler 300, preventing the filler 300 from returning, and thus to a certain extent preventing the recovery of the deformation of the package 100, avoiding the package 100 from falling off, and ensuring the reliability of the sealing.
[0042] In this embodiment, the water-swellable layer can be made of sodium acrylate, cross-linked sodium acrylate composite resin, polyvinyl alcohol, polyurethane prepolymer or a modified polyurethane prepolymer, etc.
[0043] In this embodiment, the outer shell 400 can break under a preset pressure and is made of fragile materials such as plastic, polyvinyl alcohol, or paper. The outer shell 400 protects the package 100 from damage during transportation and storage, and also facilitates its retrieval and placement. Specifically, when the outer shell 400 is made of plastic, its thickness should be relatively thin to avoid excessive breaking pressure. Meanwhile, since the package 100 is a deformable flexible component, it is easily torn during transportation and storage; placing a large number of packages 100 is also inconvenient, as they are difficult to stack and retrieve during storage, and blockages and stacking can easily occur during placement, hindering its insertion into the well. Adding the outer shell 400 protects the package 100, and the spherical shape of the outer shell 400 facilitates rolling and insertion into the well.
[0044] In this embodiment, the filler 300 can be made of particles, fluid, or a mixture of fluid and particles. The particles include at least one of soluble magnesium alloy particles, polyglycolic acid particles, plastic particles, and quartz sand; the fluid includes at least one of silicone oil and asphalt. Under fluid pressure, the filler 300 within the enclosure 100 displaces within the enclosure 100, thereby better adapting to the shape of the sealing opening.
[0045] When temporarily sealing, the package 100, rigid component 200 and filler 300 are all made of soluble materials that typically melt after 48 or 72 hours. Materials such as polyglycolic acid can be used.
[0046] For permanent sealing, insoluble materials should be selected to make the encapsulation body 100, rigid component 200, and filler 300. The encapsulation body 100 can be directly molded from a polymer, cotton, or linen, or woven from at least one of the polymer, cotton, or linen. The polymer includes materials such as PP, PE, ABS, PA, PC, and rubber. The rigid component 200 is made of a polymer or a rigid material such as metal. The polymer includes materials such as PP, PE, ABS, PA, and PC.
[0047] The working process of the fracturing orifice temporary plugging device provided in this embodiment is as follows:
[0048] After the fracturing orifice temporary plugging device is deployed, the outer casing 400 breaks apart under fluid pressure, thereby compressing the encapsulated body 100 and moving it with the fluid flowing into the improved fracturing perforation orifice 10 to plug the perforation orifice 10, as shown below. Figure 3 , Figure 4 As shown, the larger rigid component 200 is blocking the outside of the perforation orifice 10. At the same time, under the compression of fluid pressure, the package 100 deforms and the filler 300 flows accordingly. At this time, the filler 300 can pass through the through groove 210 and enter the perforation orifice 10 from the outside, thereby allowing the package 100 to better fill the perforation orifice 10.
[0049] That is, the inclusion 100 deforms under the action of fluid compression and penetrates into the perforation orifice 10. The non-deformable parts, such as the rigid parts 200, remain outside the inlet of the perforation orifice 10. The filler 300 flows through the through groove 210 and deforms the inclusion 100 until it fills the inlet of the perforation orifice 10. Except for the broken outer shell 400, the entire fracturing orifice temporary plugging device will be firmly stuck at the inlet of the perforation orifice 10, so that it will not easily fall off even in the absence of pressure difference or even negative pressure difference.
[0050] The fracturing orifice temporary plugging device provided in this embodiment can better cover, fill, and seal irregularly shaped orifices during construction. Only one fracturing orifice temporary plugging device of the corresponding specification is needed for each orifice. Operation is simple and quick, requiring no complex techniques and minimal on-site experience from operators. It eliminates the need for experienced personnel to analyze and judge downhole conditions and deploy additional orifice temporary plugging devices, thus avoiding prolonged construction periods and increased costs.
[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A temporary plugging device for fracturing orifices, characterized in that, It includes a package (100) and a rigid member (200), the rigid member (200) being disposed within the package (100), and a filler (300) being disposed within the package (100), the filler (300) being fluid.
2. The fracturing orifice temporary plugging device according to claim 1, characterized in that, The package (100), the rigid member (200), and the filler (300) are all made of a soluble material.
3. The fracturing orifice temporary plugging device according to claim 2, characterized in that, The filler (300) includes at least one of soluble magnesium alloy particles, polyglycolic acid particles, plastic particles, quartz sand, silicone oil, and asphalt; The encapsulation body (100) and the rigid member (200) are made of polyhydroxyacetic acid.
4. The fracturing orifice temporary plugging device according to claim 1, characterized in that, The package (100) is made directly from a polymer, cotton or linen, or woven from at least one of a polymer, cotton or linen. The rigid component (200) is made of polymer or metal.
5. The fracturing orifice temporary plugging device according to claim 1, characterized in that, The rigid member (200) is provided with at least one through groove (210) that penetrates itself, and the filler (300) can pass through the through groove (210); When there are multiple through slots (210), each through slot (210) is interconnected.
6. The fracturing orifice temporary plugging device according to claim 5, characterized in that, The inner wall of the through groove (210) is provided with a water-swellable layer.
7. The fracturing orifice temporary plugging device according to claim 6, characterized in that, The water-swellable layer can be made of sodium acrylate, cross-linked sodium acrylate composite resin, polyvinyl alcohol, polyurethane prepolymer, or a modified polyurethane prepolymer.
8. The fracturing orifice temporary plugging device according to claim 1, characterized in that, When the number of the rigid member (200) is one, the size of the rigid member (200) is larger than the diameter of the perforation hole (10) to block the perforation hole (10); When there are multiple rigid members (200), at least one rigid member (200) has a size larger than the diameter of the perforation hole (10), or at least one rigid member (200) has a size larger than the diameter of the perforation hole (10) and at least one rigid member (200) has a size smaller than the diameter of the perforation hole (10).
9. The fracturing orifice temporary plugging device according to claim 1, characterized in that, It also includes a shell (400), the enclosure (100) is disposed inside the shell (400), and the shell (400) ruptures under a preset pressure.
10. The fracturing orifice temporary plugging device according to claim 9, characterized in that, The outer casing (400) is made of plastic, polyvinyl alcohol, or paper.