Fracturing wellhead device

Abstract

The utility model discloses a fracturing wellhead device which comprises a variable-diameter flange, the variable-diameter flange is located between an original wellhead and a fracturing wellhead, the variable-diameter flange is connected with the fracturing wellhead through a first connecting bolt, the variable-diameter flange is connected with the original wellhead through a second connecting bolt, and the original wellhead is connected with the fracturing wellhead through a third connecting bolt. A slip hanger is arranged between the reducing flange and the original well mouth, a slip hanger sealing ring is arranged above the slip hanger, a casing sealing sleeve is arranged in the center of the reducing flange, an oil-string casing is arranged on the lower portion of the original well mouth, and the oil-string casing sealing ring is connected with the oil-string casing. The oil-string casing, the slip hanger and the casing sealing sleeve are matched with one another, and the oil-string casing is arranged on the lower portion of the reducing flange. When fracturing operation is carried out, a fracturing wellhead device system can be rapidly connected, operation time is saved, in the fracturing process, an original wellhead does not bear high pressure of the fracturing operation, and high efficiency and safety of the fracturing operation are guaranteed.

Description

Technical Field

[0001] This utility model relates to an oil production equipment, or more precisely, a fracturing wellhead device. Background Technology

[0002] As the development years of conventional oil blocks increase, production declines year by year. To improve extraction efficiency and production, it is necessary to apply advanced unconventional fracturing techniques to fracturing old conventional oil wells. The wellhead equipment used in conventional oil extraction is the KY78 / 65-70MPa type, which has a maximum working pressure of 70MPa.

[0003] The oil well employs unconventional fracturing technology, requiring high-pressure, high-volume fracturing operations. The original wellhead equipment has a low pressure rating, which is insufficient for fracturing operations. Fracturing this type of well first necessitates replacing the wellhead equipment. To address the inconvenience caused by replacing the wellhead equipment and tubing, a fracturing wellhead device is proposed. This device allows for direct installation of the fracturing wellhead equipment to commence fracturing operations without altering the tubing or wellhead equipment. Utility Model Content

[0004] Therefore, it is necessary to provide a fracturing wellhead device to address the aforementioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A fracturing wellhead device, characterized in that the fracturing wellhead device includes a reducing flange, the reducing flange being located between the original wellhead and the fracturing wellhead, the reducing flange being connected to the fracturing wellhead via a first connecting bolt, and the reducing flange being connected to the original wellhead via a second connecting bolt.

[0007] A slip hanger is provided between the reducing flange and the original wellhead, and a slip hanger sealing ring is provided above the slip hanger.

[0008] The reducing flange has a casing sealing sleeve at its center, and the lower part of the original wellhead has an oil layer casing. The oil layer casing, slip hanger, and casing sealing sleeve cooperate with each other. The lower part of the reducing flange has an oil layer casing.

[0009] In a preferred embodiment of this utility model, the casing sealing sleeve extends into the fracturing wellhead.

[0010] In a preferred embodiment of this utility model, the oil layer casing extends into the original wellhead.

[0011] In a preferred embodiment of this utility model, the sealing ring of the slip hanger is connected to the slip hanger via a set screw.

[0012] In a preferred embodiment of this utility model, a metal sealing ring is provided between the casing sealing sleeve and the fracturing wellhead.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention provides a fracturing wellhead device that can be quickly connected to the fracturing wellhead device system during fracturing operations, saving operation time. During the fracturing process, the original wellhead does not bear the high pressure of the fracturing operation, ensuring the efficiency and safety of the fracturing operation. It has obvious effects and strong practicality. Attached Figure Description

[0015] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional structural diagram of the fracturing wellhead device of this utility model;

[0017] The markings in the diagram are explained as follows: 1. Original wellhead; 10. Oil layer casing; 2. Reducing flange; 3. Fracturing wellhead; 4. First connecting bolt; 4S. Second connecting bolt; 5. Casing sealing sleeve; 6. Metal sealing ring; 7. Set screw; 8. Slip hanger sealing ring; 9. Slip hanger; 11. Technical casing. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] like Figure 1 As shown, the fracturing wellhead device includes a reducing flange 2, which is located between the original wellhead 1 and the fracturing wellhead 3. The reducing flange 2 is connected to the fracturing wellhead 3 by a first connecting bolt 4, and to the original wellhead 1 by a second connecting bolt 4S.

[0020] A slip hanger 9 is provided between the reducing flange 2 and the original wellhead 1, and a slip hanger sealing ring 8 is provided above the slip hanger 9.

[0021] The center of the reducing flange 2 is provided with a casing sealing sleeve 5, which extends into the fracturing wellhead 3. The lower part of the original wellhead 1 is provided with an oil layer casing 10. The oil layer casing 10, the slip hanger 9 and the casing sealing sleeve 5 cooperate with each other. The lower part of the reducing flange 2 is provided with an oil layer casing 10, which extends into the original wellhead 1.

[0022] In addition, the sealing ring 8 of the slip hanger is connected to the slip hanger 9 via the set screw 7.

[0023] A metal sealing ring 6 is provided between the casing sealing sleeve 5 and the fracturing wellhead 3.

[0024] The working method of this fracturing wellhead device will be explained below.

[0025] During installation, the slip hanger sealing ring 8 is pre-installed on the slip hanger 9 and, after being connected to the oil casing 10, is set into the four-way valve of the original wellhead 1. The metal sealing ring 6 is installed on the casing sealing sleeve 5 and then connected to the oil casing 10. A reducing flange 2 and a fracturing wellhead 3 are installed on the upper part of the original wellhead 1 and fixedly connected by the first connecting bolt 4 and the second connecting bolt 4S, thereby achieving a seal between the fracturing wellhead and the tubing / casing annulus. At this point, the oil casing 10, slip hanger 9, and casing sealing sleeve 5 work together to form a pressure isolation system that isolates the annulus. When fracturing operations begin, fracturing fluid is pumped directly from the fracturing wellhead 3 through the oil casing 10 to the bottom of the well, completing the fracturing operation.

[0026] This fracturing wellhead device can be quickly connected to the fracturing wellhead system during fracturing operations, saving operation time. During the fracturing process, the original wellhead does not bear the high pressure of the fracturing operation, ensuring the efficiency and safety of the fracturing operation. It has obvious effects and strong practicality.

[0027] Obviously, the embodiments described above are only some embodiments of this application, and not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application.

Claims

1. A fracturing wellhead apparatus, characterized by, The fracturing wellhead device includes a reducing flange (2), which is located between the original wellhead (1) and the fracturing wellhead (3). The reducing flange (2) is connected to the fracturing wellhead (3) by a first connecting bolt (4), and the reducing flange (2) is connected to the original wellhead (1) by a second connecting bolt (4S). A slip hanger (9) is provided between the reducing flange (2) and the original wellhead (1), and a slip hanger sealing ring (8) is provided above the slip hanger (9). The center of the reducing flange (2) is provided with a casing sealing sleeve (5), and the lower part of the original wellhead (1) is provided with an oil layer casing (10). The oil layer casing (10), the slip hanger (9) and the casing sealing sleeve (5) cooperate with each other. The lower part of the reducing flange (2) is provided with an oil layer casing (10).

2. The frac wellhead of claim 1, wherein, The casing sealing sleeve (5) extends into the fracturing wellhead (3).

3. The frac wellhead of claim 1, wherein, The oil layer casing (10) extends into the original wellhead (1).

4. The frac wellhead of claim 1, wherein, The sealing ring (8) of the slip hanger is connected to the slip hanger (9) by a set screw (7).

5. The frac wellhead of claim 1, wherein, A metal sealing ring (6) is provided between the casing sealing sleeve (5) and the fracturing wellhead (3).

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