Hydrotropy fracturing ball and petroleum well completion device

Abstract

The utility model relates to the technical field of petrochemical engineering, in particular to a hydrotropy fracturing ball and a petroleum well completion device, a filling area is arranged in the fracturing ball, solid acid is arranged in the filling area, and the solid acid is used for accelerating dissolution of a dissolvable bridge plug. According to the hydrotropy fracturing ball and the petroleum well completion device, in the dissolving process of the fracturing ball, the inner wall is gradually thinned until the solid acid in the fracturing ball is released to serve as a hydrotropy substance, and the time is safe time; after the hydrotropy is released, the dissolution of the dissolvable bridge plug is accelerated, the dissolution time of the dissolvable bridge plug is shortened, the time is gain time, and the petroleum production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a fracturing ball for dissolution and an oil well completion device. Background Technology

[0002] In downhole fracturing operations within oil well completion technology, the core function of fracturing balls compared to soluble bridge plugs is to achieve precise control of stratified fracturing through temporary sealing, and to self-dissolve after the operation to restore the wellbore diameter. Soluble fracturing balls can dissolve automatically after fracturing, eliminating the need for drilling removal, saving time and reducing costs.

[0003] Dissolution time is a core parameter for achieving efficient borehole restoration in soluble bridge plug technology. For those skilled in the art, shortening the dissolution time of soluble bridge plugs clearly contributes to improved oil production efficiency. Utility Model Content

[0004] The purpose of this invention is to address the problem in the existing technology that, in order to further improve oil production efficiency and shorten the dissolution time of soluble bridge plugs, provide a fracturing ball for dissolution and an oil well completion device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, this utility model provides a fracturing ball that aids in dissolution. The fracturing ball has a filling zone inside, and the filling zone contains a solid acid, which is used to accelerate the dissolution of soluble bridge plugs.

[0007] The fracturing ball described in this invention, during the dissolution process, has an inner wall that gradually thins until the solid acid inside is released as a co-solvent; this time is the safe time. After the co-solvent is released, it accelerates the dissolution of the soluble bridge plug, shortening the dissolution time of the soluble bridge plug; this time is the gain time, thus improving oil production efficiency.

[0008] As a preferred technical solution of this utility model, the fracturing ball includes a first shell and a second shell, and the first shell is connected to the second shell to form a sphere.

[0009] As a further preferred technical solution of this utility model, the first housing and the second housing are connected by thread or welding.

[0010] As a further preferred technical solution of this utility model, the first housing is provided with a first blind hole, and the second housing is provided with a boss, the boss extending into the first blind hole.

[0011] As a further preferred technical solution of this utility model, the protrusion is provided with a second blind hole, and the filling area includes the first blind hole and / or the second blind hole.

[0012] As a further preferred technical solution of this utility model, the outer surface of the second housing is provided with an assembly hole, which is arranged opposite to the boss.

[0013] As a further preferred technical solution of this utility model, at least one sealing ring is provided on the pressing surface of the first shell and the second shell.

[0014] As a further preferred technical solution of this utility model, the sealing ring is a sealing ring made of soluble rubber material.

[0015] As a preferred technical solution of this utility model, the fracturing ball is a metal fracturing ball.

[0016] As a preferred technical solution of this utility model, the solid acid is oxalic acid.

[0017] As a preferred technical solution of this utility model, the surface of the fracturing ball is coated with a solvent-resistant coating.

[0018] With this structural design, the solvent-resistant coating on the surface of the fracturing ball will delay the dissolution of the fracturing ball and extend the aforementioned safety time, thereby adjusting the release time of the solubilizing agent inside the fracturing ball; achieving a combination of design concepts that first inhibits dissolution and then promotes dissolution, and first slow and then fast, so that the functionality of the fracturing ball can be maximized.

[0019] Secondly, this utility model also provides an oil well completion device, including a soluble bridge plug and a fracturing ball as described in any of the above.

[0020] The oil well completion device described in this utility model uses a fracturing ball whose inner wall gradually thins during the dissolution process until the solid acid inside is released as a co-solvent. This time is the safe time. After the co-solvent is released, it accelerates the dissolution of the soluble bridge plug, shortening the dissolution time of the soluble bridge plug. This time is the gain time, which improves oil production efficiency.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0022] 1. The fracturing ball and oil well completion device described in this utility model have a thinning inner wall during the fracturing ball dissolution process until the solid acid inside is released as a co-solvent. This time is the safe time. After the co-solvent is released, it accelerates the dissolution of the soluble bridge plug and shortens the dissolution time of the soluble bridge plug. This time is the gain time, which improves the efficiency of oil production.

[0023] 2. The preferred embodiment of this utility model is a fracturing ball with a solution-inhibiting coating on the surface of the fracturing ball, which delays the dissolution of the fracturing ball and prolongs the aforementioned safety time, thereby adjusting the release time of the solution-inhibiting agent inside the fracturing ball; achieving a combination of design concepts such as first inhibiting dissolution, then promoting dissolution, and first slow and then fast, so as to maximize the functionality of the fracturing ball. Attached Figure Description

[0024] Figure 1 A schematic diagram of the three-dimensional structure of a fracturing ball for fluxing;

[0025] Figure 2 A half-section view of the fracturing ball for aided dissolution.

[0026] Marked in the image:

[0027] 1-First housing, 11-First blind hole;

[0028] 2-Second housing, 21-Boss, 22-Second blind hole, 23-Assembly hole;

[0029] 3-Sealing ring. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0031] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0033] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0034] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0035] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0036] In related technologies, during downhole fracturing operations in oil well completion processes, soluble fracturing balls can self-dissolve after fracturing, eliminating the need for drilling removal, saving time and reducing costs. Dissolution time is a core parameter for achieving efficient borehole restoration in soluble bridge plug technology. Therefore, to further improve oil production efficiency, the dissolution time of soluble bridge plugs can be further shortened. This leads to the technical solution of this application, which is described below in conjunction with… Figures 1 to 2 To elaborate.

[0037] Example 1

[0038] The present invention discloses a fracturing ball for dissolution, wherein the fracturing ball has a filling zone inside, and the filling zone contains a solid acid, which is used to accelerate the dissolution of soluble bridge plugs.

[0039] In some alternative implementations, such as Figure 1 and Figure 2 As shown, the fracturing ball includes a first shell 1 and a second shell 2, with the first shell 1 connected to the second shell 2 to form a sphere; the first shell 1 is provided with a first blind hole 11, and the second shell 2 is provided with a boss 21, the boss 21 extending into the first blind hole 11, the boss 21 being provided with a second blind hole 22, the filling area including the first blind hole 11 and / or the second blind hole 22, the mating part of the second shell 2 outside the boss 21 and the first shell 1 forming a pressing surface, the pressing surface being provided with at least one sealing ring 3, the sealing ring 3 being a soluble rubber O-ring.

[0040] In some alternative implementations, such as Figure 2 As shown, the first blind hole 11 is provided with an internal thread, the boss 21 is provided with an external thread that matches the internal thread, the outer surface of the second housing 2 is provided with an assembly hole 23, the assembly hole 23 is disposed opposite to the boss 21, the first housing 1 and the second housing 2 are connected by threads, and the second housing 2 can be tightened on the first housing 1 by inserting a tool into the assembly hole 23.

[0041] In some alternative embodiments, the first housing 1 and the second housing 2 may also be connected by welding.

[0042] In some alternative embodiments, the fracturing ball is a metal fracturing ball, and the material of the metal fracturing ball may be aluminum and its alloys, magnesium and its alloys.

[0043] In some alternative embodiments, the solid acid may be oxalic acid.

[0044] The fracturing ball described in this embodiment has an inner wall that gradually thins during the dissolution process until the solid acid inside is released as a co-solvent. This time is the safe time. After the co-solvent is released, it accelerates the dissolution of the soluble bridge plug, shortening the dissolution time of the soluble bridge plug. This time is the gain time, which improves oil production efficiency.

[0045] Example 2

[0046] The fracturing ball described in this utility model is based on Example 1, wherein the surface of the fracturing ball is coated with a solvent-resistant coating.

[0047] The solvent-resistant coating is a chemical conversion film, an anodic oxide layer, a metal coating, an organic coating, a ceramic film, or a composite coating, which can delay the dissolution time of the fracturing ball.

[0048] The chemical conversion membrane layer includes, for example, chromate conversion membrane, phosphate conversion membrane, phosphate-permanganate conversion membrane, and rare earth conversion membrane.

[0049] The anodic oxide layer is, for example, a micro-arc anodic oxide layer.

[0050] The metal coating is, for example, a single metal layer or an alloy layer.

[0051] The organic coating is, for example, a modified polytetrafluoroethylene + phenolic resin nanomaterial coating.

[0052] The ceramic film layer is, for example, a micro-arc oxidation ceramic film layer.

[0053] The composite coating is, for example, an acid-resistant, temperature-controlled, soluble coating layer.

[0054] The fracturing ball described in this embodiment has a solvent-inhibiting coating on its surface that delays the dissolution of the fracturing ball and extends the aforementioned safety time, thereby adjusting the release time of the solvent-inhibiting agent inside the fracturing ball. This combination of design concepts, which achieves first solvent inhibition and then solvent assistance, and first slow and then fast, maximizes the functionality of the fracturing ball.

[0055] Example 3

[0056] The present invention relates to an oil well completion device, comprising a soluble bridge plug and a fracturing ball as described in Example 1 or Example 2.

[0057] In this embodiment, an oil well completion device is described. During the dissolution process of the fracturing ball, the inner wall gradually thins until the solid acid inside is released as a co-solvent. This time is the safety time. After the co-solvent is released, the dissolution of the soluble bridge plug is accelerated, shortening the dissolution time of the soluble bridge plug. This time is the gain time, which improves oil production efficiency.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A subscale fracturing ball, characterized in that, The fracturing ball has a filling zone inside, and the filling zone contains solid acid, which is used to accelerate the dissolution of the soluble bridge plug; The fracturing ball includes a first shell (1) and a second shell (2), wherein the first shell (1) is connected to the second shell (2) to form a sphere; The first housing (1) is provided with a first blind hole (11), and the second housing (2) is provided with a boss (21), which extends into the first blind hole (11).

2. The facilitated-solubility frac ball of claim 1, wherein, The first housing (1) and the second housing (2) are connected by thread or welding.

3. The facilitated-solubility frac ball of claim 1, wherein, The boss (21) is provided with a second blind hole (22), and the filling area includes the first blind hole (11) and / or the second blind hole (22).

4. The facilitated-solubility frac ball of claim 1, wherein, At least one sealing ring (3) is provided on the pressing surface of the first housing (1) and the second housing (2).

5. The facilitated-solubility frac ball of claim 1, wherein, The fracturing ball is a metal fracturing ball.

6. The facilitated-solubility frac ball of claim 1, wherein, The solid acid is oxalic acid.

7. The facilitated-solubility frac ball of any of claims 1-6, wherein, The surface of the fracturing ball is coated with a solvent-resistant coating.

8. An apparatus for completing a well for oil production, characterized in that Includes soluble bridge plugs and fracturing balls as described in any one of claims 1-7.

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