CN202100220U - Oil pipe and casing hanger with controllable sealing performance - Google Patents

Abstract

The utility model discloses an oil pipe and casing hanger with controllable sealing performance, which comprises a hanger main body, a metal sealing ring assembly and a release-preventive nut. The metal sealing ring assembly comprises an upper conical ring, an upper metal sealing ring, a lower metal sealing ring, a packer ring, an O-shaped sealing ring and a lower conical ring, annular concave conical grooves are respectively processed on the upper surface and the lower surface of each metal sealing ring, cone angles of the annular concave conical grooves are 23 degrees, and the metal sealing ring assembly is coaxially sleeved in an annular groove on the outer wall of the hanger main body. The oil pipe and casing hanger solves problems that sealing rings of an existing hanger need to be regularly replaced, and sealing performance of the existing hanger is poor. The hanger adopts the double metal sealing rings with conical expansion type structures, sealing performances of the sealing rings and a four-way inner cavity of an oil pipe or casing are strengthened, the service life is long, leakage of a wellhead due to ageing and damage of sealing components can be assuredly avoided after the wellhead is used for a long time, and production operation cost of an oilfield is saved.

Description

Tubing and casing hanger with controllable sealing performance

technical field

The utility model relates to an oil pipe and casing hanger for gas injection and oil production in an oil field.

Background technique

At present, the tubing and casing hangers of oilfield water injection, gas injection, gas production, and oil production wellhead devices are mainly made of non-metallic seals. Non-metallic sealing materials are easy to age, have a short service life and poor anti-corrosion performance. The non-metallic sealing ring of the sealing part must be replaced regularly, but the replacement operation requires the use of oversized mobile equipment and engineering vehicles, the operation process is complicated, the production efficiency is low, and a lot of financial and material resources are wasted. the

Contents of the invention

In order to overcome the deficiencies of the tubing and casing hangers in the background technology, the utility model provides a controllable sealing performance

The tubing and casing hanger, which can realize permanent sealing, does not need to be replaced during use, which greatly reduces the production cost of oilfield gas injection, oil production and other projects, and brings considerable economic benefits to the oilfield.

The technical solution adopted in this application to solve the technical problems is: oil pipe and casing hanger with controllable sealing performance, including suspension main body, metal sealing ring assembly and anti-loosening nut, wherein the outer wall of the head of the suspension main body is processed with a ring Groove, the bottom of the annular groove is processed with external thread, and the anti-loosening nut is connected to the external thread; the metal sealing ring assembly includes the upper cone ring, the upper and lower metal sealing rings, the packing ring, and the O-ring , lower cone ring, wherein the upper and lower surfaces of the metal sealing ring are respectively processed with annular concave cone grooves with a cone angle of 23°, the lower surface of the upper cone ring, the upper surface of the lower cone ring and the upper and lower surfaces of the packing ring are respectively provided with On the upper and lower surfaces of the metal sealing ring, the corresponding conical protrusions of the annular concave cone groove, the outer wall of the packing ring is provided with a sealing ring groove along the circumference, and the O-shaped sealing ring is installed in the sealing ring groove of the packing ring; the upper cone ring , the upper metal seal ring, the packing ring, the lower metal seal ring, and the lower cone ring are sequentially assembled together through the annular concave cone groove to form a metal seal ring assembly; the metal seal ring assembly is coaxially sleeved on the outer wall of the suspension main body. inside the groove.

The beneficial effects are:

① The tubing and casing hanger with controllable sealing performance of this application is designed with anti-fatigue and corrosion-resistant double-layer metal sealing rings. The sealing performance of the cavity; it can realize that the wellhead device does not need to replace the sealing parts of the hanger during the use of oilfield engineering, and has a long service life, ensuring that the wellhead will not leak due to aging and damage of the sealing parts for a long time, and reduce the production and operation of the wellhead. equipment investment;

②The cooperation between the metal sealing ring and the inner cavity of the tubing casing spool adopts a conical fit type, so as to reduce the fitting friction force and lifting force of the sealing ring and the inner cavity of the tubing casing spool when lifting the hanger device, and can effectively The surface of the inner cavity of the metal sealing ring and the tubing casing spool is not scratched, and it is also convenient for the installation, use and maintenance of the metal sealing ring and the tubing casing spool; it is beneficial to the production of gas injection and oil production in the oil field. The oil field saves production operation costs.

Description of drawings

Fig. 1 is a structural schematic diagram of the tubing and casing hanger with controllable sealing performance of the utility model.

In the figure: 1-suspension main body, 2-upper cone ring, 3-upper metal seal ring, 3'-lower metal seal ring, 4-separation ring, 5-O-ring seal, 6-lower cone ring, 7- Anti-off screw, 8-tubing, casing.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Fig. 1 in conjunction with Fig. 2, the oil pipe and casing hanger with controllable sealing performance of the present application includes a suspension main body 1, a metal sealing ring assembly and an anti-loosening nut 7, wherein the outer wall of the head of the suspension main body 1 is processed There is an annular groove, and an external thread is processed under the annular groove, and an anti-loosening nut 7 is connected to the external thread; the metal sealing ring assembly includes an upper cone ring 2, upper and lower metal sealing rings 3, 3', Packing ring 4, O-shaped sealing ring 5, and lower cone ring 6, wherein the upper and lower surfaces of the metal seal ring are respectively processed with annular concave cone grooves with a cone angle of 23°, the lower surface of the upper cone ring 2, and the lower surface of the lower cone ring 6 The upper surface and the upper and lower surfaces of the packing ring 4 are respectively provided with conical protrusions corresponding to the annular concave cone grooves on the upper and lower surfaces of the metal sealing ring, the outer wall of the packing ring 4 is provided with a sealing ring groove along the circumference, and the O-shaped sealing ring 5 Installed in the sealing ring groove of the packer ring 4; the upper cone ring 2, the upper metal seal ring 3, the packer ring 4, the lower metal seal ring 3', and the lower cone ring 6 are assembled together through the annular concave cone groove in sequence Finally, a metal sealing ring assembly is formed; the metal sealing ring assembly is coaxially sleeved in the annular groove on the outer wall of the suspension main body 1 .

During work, the oil pipe and casing pipe 8 are threadedly connected to the bottom of the hanger.

Claims (1)

1. A oil pipe and casing hanger with controllable sealing performance, comprising a suspension main body, a metal sealing ring assembly and an anti-loosening nut, characterized in that: the outer wall of the head of the suspension main body is processed with an annular groove, and the annular groove The lower part of the outer thread is processed with an external thread, and an anti-loosening nut is connected to the external thread; the metal seal ring assembly includes an upper cone ring, an upper and a lower metal seal ring, a packing ring, an O-shaped seal ring, and a lower cone ring, wherein The upper and lower surfaces of the metal sealing ring are respectively processed with annular concave cone grooves with a cone angle of 23°. The lower surface of the upper cone ring, the upper surface of the lower cone ring and the upper and lower surfaces of the isolation ring are respectively provided with The corresponding conical protrusion of the annular concave cone groove, the outer wall of the packing ring is provided with a sealing ring groove along the circumference, and the O-shaped sealing ring is installed in the sealing ring groove of the packing ring; the upper cone ring, the upper metal sealing ring, The packing ring, the lower metal sealing ring and the lower cone ring are sequentially assembled together through the annular concave cone groove to form a metal sealing ring assembly; the metal sealing ring assembly is coaxially sleeved in the annular groove on the outer wall of the suspension main body.