Petroleum wellhead instrument heat preservation protective cover
By designing an annular elastic liquid bladder and an electric heating wire, the problem of insufficient sealing of the instrument cover at the oil wellhead was solved, achieving good sealing performance in the field environment and adaptability to pressure taps of different diameters, thus reducing equipment costs and maintenance time.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG BORUI EQUIP TECH CO LTD
- Filing Date
- 2025-09-12
- Publication Date
- 2026-05-08
AI Technical Summary
Existing wellhead instrument protective covers are not sufficiently airtight in field environments, are prone to aging, and cannot accommodate pressure taps of different diameters, increasing equipment costs and maintenance time.
The design employs an annular elastic liquid bladder and an electric heating wire. The annular elastic liquid bladder can adapt to pressure tubes of different diameters, seal gaps, and maintain the instrument's temperature stability through heating, preventing cold air from entering.
It achieves excellent sealing performance in field environments, adapts to pressure taps of different diameters, reduces equipment costs and maintenance time, and ensures the accuracy and stability of instrument measurements.
Smart Images
Figure CN224216105U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of instrument protection technology, and in particular to a thermal insulation and protective cover for oil wellhead instruments. Background Technology
[0002] In oil extraction operations, wellhead instruments (such as pressure gauges and flow meters) are core equipment for monitoring key production parameters such as wellhead pressure and flow rate. Their measurement accuracy and stable operation directly determine the safety and efficiency of extraction operations. However, oil wellheads are often located in complex outdoor environments, facing multiple adverse factors such as low temperatures, dust, rain, snow, and vibration. To connect the pressure taps to the instruments, inlet holes need to be opened on the side wall of the protective cover. Existing technologies mostly use sealing putty or fixed-specification explosion-proof sealing joints for sealing. Although sealing putty is inexpensive, it is prone to aging and cracking when exposed to the outdoor environment for a long time, allowing cold air to seep into the interior of the protective cover through the gaps, disrupting the temperature stability inside the box. Moreover, once the putty has hardened, it is difficult to remove, requiring cleaning and reapplying during subsequent maintenance, which is cumbersome. Although explosion-proof sealing joints have better sealing performance, their specifications are fixed and can only be used with pressure taps of a single diameter. However, in oil wellhead operations, pressure taps of different diameters need to be changed according to monitoring requirements, which requires changing the corresponding specification joints, increasing equipment costs and maintenance time.
[0003] Therefore, it is necessary to provide a new type of thermal insulation and protective cover for oil wellhead instruments to solve the above-mentioned technical problems. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a thermal insulation and protective cover for oil wellhead instruments.
[0005] The oil wellhead instrument heat preservation and protection cover provided by this utility model includes a protective box. The front box surface of the protective box is equipped with a rotating door, and the side wall of the protective box is provided with an inlet hole for inserting a pressure pipe.
[0006] A sealing component is installed inside the inlet hole, and the sealing component includes a wire guide tube. The wire guide tube is fixedly installed inside the inlet hole. An inner annular groove is formed in the inner wall of the wire guide tube, and an annular elastic liquid bladder is embedded in the inner annular groove. An annular liquid storage cavity is formed in the tube body of the wire guide tube located inside the protective box. The annular liquid storage cavity is interconnected with the annular elastic liquid bladder through several annularly distributed connecting tubes. A slidingly connected annular piston column is installed inside the annular liquid storage cavity.
[0007] Both the annular liquid storage cavity and the annular elastic liquid bladder contain water-based solutions, and an electric heating wire is installed inside the annular elastic liquid bladder.
[0008] Preferably, the sealing component further includes an annular rotating cover, the annular rotating cover having an L-shaped cross-section, and a rotating ring rotatably connected to the inner cover surface of the annular rotating cover. Multiple annularly distributed central connecting rods are fixedly installed on the rotating ring, and the other end of each central connecting rod is inserted into the annular liquid storage cavity and fixedly connected to the cylindrical surface of the annular piston column opposite to the annular elastic liquid bladder.
[0009] Preferably, the annular rotating cover has an internal thread, and the outer wall of the conduit located inside the protective box has an external thread that matches the internal thread.
[0010] Preferably, the outer wall of the annular elastic fluid bladder is fixedly connected to the inner wall of the inner annular groove.
[0011] Preferably, the inner wall of the protective box is fixedly fitted with an insulation layer, and an S-shaped heat tracing cable is laid on the insulation layer.
[0012] Preferably, the conduit with the annular elastic fluid bladder installed is located in the box plate of the protective box.
[0013] Preferably, the inner wall of the protective box is equipped with a control panel, and the control panel is equipped with a temperature sensor. The control panel is electrically connected to the heating tape and the electric heating wire via wires.
[0014] Preferably, the protective box is equipped with a mounting bracket for mounting instruments.
[0015] Compared with related technologies, the oil wellhead instrument thermal insulation and protective cover provided by this utility model has the following advantages:
[0016] Beneficial effects:
[0017] Compared with traditional sealing putty or explosion-proof sealing joints that seal the inlet hole on the side wall of the protective box, this utility model features an annular elastic liquid bladder with an elastic structure. The expanded annular elastic liquid bladder can quickly fill the gap between the pressure tube and the conduit, achieving a seal. This effectively allows cold air from outside the protective box to enter through the gap. The elastic structure of the annular elastic liquid bladder not only eliminates the problem of seal failure caused by vibration of the pressure tube or the protective box, but also adapts to pressure tubes of different diameters. The electric heating wire can heat the water-based solution inside the annular elastic liquid bladder, and the heated annular elastic liquid bladder can exchange heat with the pressure tube in that part, preventing the pressure tube from being exposed to low temperatures. Attached Figure Description
[0018] Figure 1 A schematic diagram of a preferred embodiment of the thermal insulation and protective cover for oil wellhead instruments provided by this utility model;
[0019] Figure 2 for Figure 1 A cross-sectional view of the protective box and sealing components shown.
[0020] Figure 3 for Figure 2 A cross-sectional view of the protective box shown.
[0021] Figure 4 for Figure 2 A cross-sectional view of the sealing component is shown.
[0022] The following are the labels in the diagram: 1. Protective box; 1a. Cable inlet; 11. Box door; 12. Mounting bracket; 2. Sealing component; 21. Conduit; 21a. Inner annular groove; 21b. Annular liquid storage chamber; 211. External threaded part; 22. Annular elastic liquid bladder; 23. Annular piston column; 24. Annular rotating cover; 241. Rotating ring; 242. Central connecting rod; 243. Internal threaded part; 25. Connecting pipe; 3. Control panel; 4. Insulation layer; 5. Heating tape; 6. Electric heating wire. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0024] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.
[0025] Please see Figures 1 to 4 This utility model provides a thermal insulation protective cover for oil wellhead instruments, which includes a protective box 1 and a sealing component 2.
[0026] In the embodiments of this utility model, please refer to Figures 1 to 4 The protective box 1 has a rotating door 11 installed on the front of the box, and a mounting bracket 12 for installing instruments is installed inside the protective box 1. The side wall of the protective box 1 has an inlet hole 1a for inserting the pressure tube.
[0027] It should be noted that: the protective box 1 is installed on the side of the oil wellhead, and the detection instrument is installed on the mounting bracket 12 (a pressure gauge is used as an example in this application). At the same time, a pressure tapping section or nozzle is welded to the pipeline that needs to be monitored at the oil wellhead. A root valve is installed on the pressure tapping section, and a pressure tapping pipe (usually a stainless steel pipe or a copper pipe) is connected from the outlet of the root valve. Then, the pressure tapping pipe enters the box from the conduit 21 on the side wall of the protective box 1. The pressure tapping pipe is first connected to an instrument valve (or needle valve), and then connected to the pressure gauge through the short threaded pipe installed on the instrument valve. The pressure tapping pipe located outside the protective box 1 needs to be wrapped with electric heating tape and wrapped with insulation cotton.
[0028] In the embodiments of this utility model, please refer to Figures 1 to 4 A sealing component 2 is installed in the inlet hole 1a, and the sealing component 2 includes a wire tube 21. The wire tube 21 is fixedly installed in the inlet hole 1a. An inner ring groove 21a is opened in the inner wall of the wire tube 21, and an annular elastic liquid bladder 22 is embedded in the inner ring groove 21a. The outer wall of the annular elastic liquid bladder 22 is fixedly connected to the inner wall of the inner ring groove 21a. The tube body of the wire tube 21 located in the protective box 1 has an annular liquid storage cavity 21b. The annular liquid storage cavity 21b is interconnected with the annular elastic liquid bladder 22 through several annularly distributed connecting pipes 25. An annular piston column 23 with sliding connection is installed in the annular liquid storage cavity 21b.
[0029] The sealing component 2 also includes an annular rotating cover 24. The annular rotating cover 24 has an L-shaped cross-section, and a rotating ring 241 is installed on the inner cover surface of the annular rotating cover 24. Multiple annularly distributed central connecting rods 242 are fixedly installed on the rotating ring 241, and the other end of each central connecting rod 242 is inserted into the annular liquid storage cavity 21b and fixedly connected to the cylindrical surface of the annular piston column 23 away from the annular elastic liquid bladder 22. The annular rotating cover 24 is provided with an internal thread 243. The outer wall of the conduit 21 located in the protective box 1 is provided with an external thread 211 that matches the internal thread 243. Both the annular liquid storage cavity 21b and the annular elastic liquid bladder 22 store water-based solutions.
[0030] It should be noted that after the pressure tapping tube is connected to the pressure gauge on the mounting bracket 12, the inward-pushing annular rotating cover 24 moves towards the conduit 21, causing the annular piston rod 23 in the annular reservoir 21b to slide towards the bottom of the annular reservoir 21b. This allows the liquid in the annular reservoir 21b to be injected into the annular elastic liquid bladder 22 through the connecting tube 25. Consequently, the annular elastic liquid bladder 22 expands rapidly and fills the gap between the pressure tapping tube and the conduit 21. When the internal thread 243 on the annular rotating cover 24 connects with the conduit... After the external thread 211 at position 21 contacts, rotating the annular rotating cover 24 causes the internal thread 243 to lock with the external thread 211, thus completing the position locking of the annular piston column 23. During maintenance, reverse the annular rotating cover 24 to make it slide off the external thread 211, and then pull the annular rotating cover 24 outward through the annular piston column 23 along the annular liquid storage cavity 21b, thus creating a negative pressure in the annular liquid storage cavity 21b, so that the liquid in the annular elastic liquid bladder 22 flows back into the annular liquid storage cavity 21b, making it easy for the pressure tapping tube to slide out of the conduit 21.
[0031] Compared with traditional sealing putty or explosion-proof sealing joints that seal the inlet hole 1a on the side wall of the protective box 1, the annular elastic liquid bladder 22 is an elastic structure. The expanded annular elastic liquid bladder 22 can quickly fill the gap between the pressure tube and the conduit 21 and achieve the sealing of the gap. Effectively, cold air from outside the protective box 1 can enter the protective box 1 through the gap. The elastic structure of the annular elastic liquid bladder 222 not only eliminates the problem of sealing failure of the annular elastic liquid bladder 22 due to vibration of the pressure tube or the protective box 1, but also adapts to pressure tubes of different diameters.
[0032] In the embodiments of this utility model, please refer to Figures 1 to 4 The inner wall of the protective box 1 is fixedly fitted with an insulation layer 4, and an S-shaped heat tracing cable 5 is laid on the insulation layer 4. The inner wall of the protective box 1 is equipped with a control panel 3, and a temperature sensor is installed on the control panel 3. The control panel 3 is electrically connected to the heat tracing cable 5 and the electric heating wire 6 through wires.
[0033] It should be noted that a predetermined value range is set on the temperature sensor. When the temperature inside the protective box 1 is lower than the predetermined value set by the temperature sensor, the electric heating wire 6 and the heat tracing cable 5 are activated through the control panel 3. The heat tracing cable 5 can quickly raise the temperature inside the protective box 1 to protect the pressure gauge. The electric heating wire 6 can heat the water-based solution inside the annular elastic liquid bladder 22. The heated annular elastic liquid bladder 22 can exchange heat with the pressure tapping tube of this part, reduce the temperature difference between the pressure tapping tube inside and outside the protective box 1, and avoid the pressure not being transmitted accurately.
[0034] In this embodiment: the water-based solution is an aqueous solution of propylene glycol, the annular elastic liquid bladder 22 is made of fluororubber or perfluoroether rubber, and the insulation layer 4 is an insulation board.
[0035] Furthermore, the conduit 21 with the annular elastic liquid bladder 22 installed is located in the box plate of the protective box 1, thereby working with the insulation layer 4 and the heat tracing cable 5 inside the protective box 1 to further insulate the guide tube.
[0036] Considering the safety of wellhead operations, an explosion-proof protective box is selected; at the same time, to avoid the wellhead vibration source (pumping unit), a vibration damping pad can be installed at the bottom of the protective box.
[0037] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.
[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A thermal insulation protective cover for oil wellhead instruments, comprising a protective box (1), wherein a rotating door (11) is installed on the front surface of the protective box (1), and an inlet hole (1a) for inserting a pressure pipe is provided on the side wall of the protective box (1), characterized in that: A sealing component (2) is installed in the inlet hole (1a), and the sealing component (2) includes a threading tube (21). The threading tube (21) is fixedly installed in the inlet hole (1a). An inner ring groove (21a) is opened in the inner wall of the threading tube (21), and an annular elastic liquid bladder (22) is embedded in the inner ring groove (21a). An annular liquid storage cavity (21b) is opened in the tube body of the threading tube (21) located in the protective box (1). The annular liquid storage cavity (21b) is interconnected with the annular elastic liquid bladder (22) through several annularly distributed connecting pipes (25). An annular piston column (23) with sliding connection is installed in the annular liquid storage cavity (21b). Both the annular liquid storage chamber (21b) and the annular elastic liquid bladder (22) store water-based solutions, and an electric heating wire (6) is installed in the annular elastic liquid bladder (22).
2. The thermal insulation and protective cover for oil wellhead instruments according to claim 1, characterized in that, The sealing component (2) also includes an annular rotating cover (24), the cross-section of which is L-shaped, and a rotating ring (241) is installed on the inner cover surface of which is rotatably connected. Multiple annularly distributed central connecting rods (242) are fixedly installed on the rotating ring (241), and the other end of each central connecting rod (242) is inserted into the annular liquid storage cavity (21b) and fixedly connected to the annular piston column (23) away from the cylindrical surface of the annular elastic liquid bladder (22).
3. The thermal insulation and protective cover for oil wellhead instruments according to claim 2, characterized in that, The annular rotating cover (24) is provided with an internal thread (243), and the outer wall of the conduit (21) located inside the protective box (1) is provided with an external thread (211) that matches the internal thread (243).
4. The thermal insulation and protective cover for oil wellhead instruments according to claim 1, characterized in that, The outer wall of the annular elastic fluid bladder (22) is fixedly connected to the inner wall of the inner annular groove (21a).
5. The thermal insulation and protective cover for oil wellhead instruments according to claim 1, characterized in that, The inner wall of the protective box (1) is fixedly fitted with an insulation layer (4), and an S-shaped heat tracing cable (5) is laid on the insulation layer (4).
6. The thermal insulation and protective cover for oil wellhead instruments according to claim 5, characterized in that, The conduit (21) with the annular elastic fluid bladder (22) installed in it is located in the box plate of the protective box (1).
7. The thermal insulation and protective cover for oil wellhead instruments according to claim 5, characterized in that, The inner wall of the protective box (1) is equipped with a control panel (3), and a temperature sensor is installed on the control panel (3). The control panel (3) is electrically connected to the heating tape (5) and the electric heating wire (6) through wires.
8. The thermal insulation and protective cover for oil wellhead instruments according to claim 1, characterized in that, The protective box (1) is equipped with a mounting bracket (12) for installing instruments.