Oil production wellhead hanger

Abstract

The utility model relates to an oil production wellhead hanger, and belongs to the technical field of wellhead devices. The oil production wellhead hanger comprises a flange plate used for being connected with a flange on a casing four-way body and a hanging short section connected to a center channel of the flange plate in a threaded mode. The lower end of the hanging short section is provided with a pipe column connecting end used for being connected with a pipe column, and an overflowing channel penetrating through the upper end and the lower end of the hanging short section is arranged in the hanging short section. According to the oil production wellhead hanger, the situation that an O-shaped rubber ring of a conventional hollow conical built-in hanger is punctured and damaged by mechanical force or is aged and damaged due to long-time soaking in high-temperature, high-pressure, high-acid and / or high-salt fluid, and production halt is caused can be avoided.

Description

Technical Field

[0001] The utility model relates to an oil production wellhead hanger, belonging to the technical field of wellhead devices. Background Art

[0002] The tubing head is an important part of the wellhead device of oil, gas and water wells at the oilfield production site, and is located at the bottom of the entire Christmas tree. The casing head refers to the part from the main valve to the large flange of the casing four-way, including the casing four-way and the hanger, which is used to hang the tubing and seal the annular space of the casing. At present, the hanger commonly used in the oilfield production site is a hollow conical built-in hanger. When in use, the hollow conical built-in hanger is installed in the wellhead casing four-way. The lower part is sealed with the inner wall of the wellhead casing four-way through the cone of the hanger. The hollow part is connected to the hanging of the downhole tubing through the internal thread, and the upper part is sealed to transport oil and gas through the wellhead upper flange. In the wellhead casing four-way, the annular space of the casing and the upper part of the inner hole space of the tubing are sealed and isolated by the "O" type rubber ring on the hollow conical built-in hanger, and oil and gas are produced or fluids are injected according to the technical channel.

[0003] However, due to the characteristics of the "O"-shaped rubber ring, the rubber material itself is soft and cannot withstand high temperatures and pressures. Therefore, when the hollow conical built-in hanger is isolated by the "O"-shaped rubber ring and the casing four-way conical seal, there are also technical defects such as low wellhead pressure, small temperature difference range, and easy leakage due to wear of the pipe seat seal. Not only that, the "O"-shaped rubber seal ring on the hollow conical built-in hanger will gradually age and even be corroded and damaged due to long-term contact with high temperature, high pressure, high acid and / or high salt fluids during the oil and gas production process, resulting in poor sealing, resulting in reduced production and shutdown of oil and water wells. Operational measures must be taken to replace it before normal production can be restored. Utility Model Content

[0004] The utility model aims to provide an oil wellhead hanger to solve the problem that the existing casing spool internal hanger is easily ineffective due to the failure of the "O" type rubber sealing ring, resulting in poor sealing.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An oil wellhead hanger comprises a flange plate for connecting to a flange on a casing spool body and a suspension nipple threadedly connected to a central channel of the flange plate; a pipe column connecting end for connecting to a pipe column is arranged at the lower end of the suspension nipple, and a flow passage penetrating the upper and lower ends of the suspension nipple is arranged inside.

[0007] Furthermore, an annular sealing groove is provided on the lower sealing surface of the flange.

[0008] Furthermore, the pipe column connecting end of the suspension short section is located below the lower end surface of the flange.

[0009] Furthermore, the pipe column connecting end is provided with an external thread for connecting with the pipe column.

[0010] Furthermore, the flow passage of the suspension nipple is cylindrical, and its inner diameter is the same as that of the pipe column.

[0011] Furthermore, the upper end of the suspension short section is a wellhead equipment connection end, and the wellhead equipment connection end is located above the upper end surface of the flange.

[0012] Furthermore, the wellhead equipment connection end is provided with an internal thread and a square diameter on the outside.

[0013] The oil production wellhead hanger of the utility model is a brand-new component, which can replace the conventional flange plate connected to the flange on the wellhead casing four-way body and be connected to the casing four-way. The suspension short section threadedly connected to the flange plate can play the role of sealing the annular space of the oil casing, and the lower end of the suspension short section can be directly connected to the pipe column, thereby avoiding the "O"-shaped rubber ring of the conventional hollow cone built-in hanger from being pierced by mechanical force and damaged during the maintenance measures for oil, gas and water wells or the treatment of production accidents, thereby preventing the "O"-shaped rubber ring from being aged and damaged due to long-term immersion in high-temperature, high-pressure, high-acid and / or high-salt fluids during oil and gas production, thereby avoiding repeated operations, thereby optimizing the operation process and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an oil wellhead hanger according to Example 1 of the utility model;

[0015] Figure 2 It is a schematic diagram of a suspension nipple of an oil wellhead hanger according to Example 1 of the utility model;

[0016] Figure 3 This is a schematic diagram of a flange of an oil wellhead hanger according to Example 1 of the utility model;

[0017] Among them, 1-flange, 2-suspension short section, 3-external thread, 4-internal thread of wellhead equipment connection end, 5-external thread of pipe column connection end, 6-flow channel, 7-square diameter, 8-annular sealing groove, 9-bolt hole, 10-internal thread of flange center channel, 11-flange center channel. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below in conjunction with specific implementation methods.

[0019] Example 1

[0020] The oil wellhead hanger of this embodiment is as follows: Figures 1 to 3 As shown, it includes a flange 1 and a suspension short section 2.

[0021] The flange center channel 11 of the flange 1 is provided with a flange center channel internal thread 10, and an annular sealing groove 8 is provided on the lower end sealing surface; the flange 1 is also provided with a bolt hole 9 for connecting with the flange on the sleeve cross body; in other implementations, the annular sealing groove 8 may not be provided, and a sealing gasket may be used for sealing during installation.

[0022] The suspension nipple 2 is threadedly connected to the central channel 11 of the flange through the external thread 3 set in the middle section. The upper and lower ends of the suspension nipple 2 extend out of the central channel 11 of the flange. The upper end forms a wellhead equipment connection end above the upper end surface of the flange 1, and the lower end forms a pipe column connection end below the lower end sealing surface. The wellhead equipment connection end is provided with a wellhead equipment connection end internal thread 4, which is convenient for connection with the wellhead equipment. The outside is a square diameter 7, which is convenient for the suspension nipple 2 to be connected or disassembled with the pipe column, the flange 1, the wellhead equipment, etc. The pipe column connection end is provided with a pipe column connection end external thread 5 for connection with the pipe column. The suspension nipple 2 is provided with a flow passage running through the upper and lower ends. The cross section of the flow passage is circular, and the diameter is the same as the inner diameter of the pipe column.

[0023] In other embodiments, the square diameter may not be set on the outer edge of the upper section, and an inner square diameter may be set at the wellhead equipment connection end.

[0024] When in use, the casing spool upper flange of the utility model directly replaces the common upper flange or the hanging upper flange originally connected to the wellhead casing spool, and is installed on the upper part of the wellhead casing spool. Specifically, the hanging short section 2 is threadedly connected to the flange plate 1 and tightened by using the square diameter 7, and then the external thread 9 of the pipe column connecting end of the hanging short section 2 is directly connected to the pipe column thread, and then the lower part of the flange plate 1 is connected to the casing spool through a steel sealing gasket, a fixing screw and the casing spool, and the wellhead equipment connecting end of the hanging short section 2 is connected to the main valve of the wellhead oil tree or gas tree, and after the oil tree is installed, oil and gas are sealed and transported or water and gas are injected.

[0025] Example 2

[0026] The oil wellhead hanger of this embodiment is different from the oil wellhead hanger of Example 1 only in that the upper end of the suspension nipple of the oil wellhead hanger of this embodiment is flush with the upper end surface of the flange, and the upper end is not provided with an internal thread but with an internal square diameter, so as to facilitate the connection and disassembly of the suspension nipple 2 with the flange 1 and the pipe column. The oil wellhead hanger of this embodiment is the same as that of Example 1 in use, and directly replaces the ordinary upper flange or the suspension upper flange of the original wellhead casing spool, and can be installed on the upper part of the wellhead casing spool.

Claims

1. An oil wellhead hanger, characterized in that: It comprises a flange plate for connecting with the flange on the casing cross body and a suspension nipple threadedly connected to the central channel of the flange plate; the lower end of the suspension nipple is provided with a pipe column connecting end for connecting with the pipe column, and a flow passage penetrating the upper and lower ends of the suspension nipple is provided inside.

2. The oil wellhead hanger according to claim 1, characterized in that: The lower end sealing surface of the flange is provided with an annular sealing groove.

3. The oil wellhead hanger according to claim 1 or 2, characterized in that: The pipe column connection end of the suspension short section is located below the lower end surface of the flange.

4. The oil wellhead hanger according to claim 3, characterized in that: The pipe column connecting end is provided with an external thread for connecting with the pipe column.

5. The oil wellhead hanger according to claim 1 or 2, characterized in that: The flow passage of the suspension nipple is cylindrical, and its inner diameter is the same as that of the pipe string.

6. The oil wellhead hanger according to claim 1 or 2, characterized in that: The upper end of the suspension nipple is the wellhead equipment connection end, and the wellhead equipment connection end is located above the upper end surface of the flange.

7. The oil wellhead hanger according to claim 6, characterized in that: The wellhead equipment connection end is provided with an internal thread and the outside is a square diameter.

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