CN104534138A - Ground constant-pressure throttling valve - Google Patents

Abstract

The invention relates to a constant pressure throttle valve on the ground, which is used for the transportation of oil and gas on the ground. Composed of high temperature resistant rubber sealing ring, metal sealing ring, O-ring and bolts. The spring is placed on the valve body at the upper part of the inlet, and its upper end is in contact with the spring plate; the spring plate can slide up and down along the inner wall of the valve body, and there is a groove at the center of the upper part; the spring plate is connected with the valve stem through the groove, There is an oil and gas channel in the center of the valve stem; there is a chamber between the top and the valve cover, and the high temperature resistant rubber sealing ring is used to realize the dynamic seal between the valve stem and the valve cover; the valve seat is placed on the boss in the valve body, and through the valve seat Retaining ring to achieve a tight seal. The invention can automatically adjust the opening of the orifice according to the change of the wellhead pressure; the structure is simple, the performance is reliable, and the electric heating wire is provided in the valve core, which can ensure a relatively high temperature at the orifice and prevent the formation of hydrates.

Description

A Ground Constant Pressure Throttle Valve

technical field

The invention relates to a constant-pressure throttle valve on the ground, which is used for the transportation of oil and gas on the ground, and belongs to the technical field of throttle valves.

Background technique

In the process of oil and gas extraction and transportation, in order to reduce the pressure of high-pressure oil and gas in the well to the safe pressure of the surface transportation pipeline, it is often necessary to install a throttle valve on the ground for throttling and pressure reduction. However, the opening of the orifice of the conventional choke valve is constant during normal operation, and the wellhead pressure of the oil and gas well is unstable, which will cause fluctuations in the outlet pressure of the choke valve, which will affect the safety of the ground transportation pipeline and related equipment. Moreover, during the throttling and depressurization process of the throttle valve, the temperature will drop, and hydrates are likely to be generated, and the generated hydrates will block the throttle valve and the transportation pipeline.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a surface constant pressure throttle valve, which can automatically adjust the opening of the throttle opening according to the change of wellhead pressure, so as to ensure that the outlet pressure of the throttle valve does not change with the change of wellhead pressure; And it can keep the temperature at the throttle port from being too low during the throttling and depressurization process of the throttle valve, so as to prevent the formation of hydrates.

The technical solution of the present invention is: a ground constant pressure throttle valve of the present invention, which is mainly composed of a valve body, a valve seat, a valve seat fixing ring, a valve core, a valve stem, a valve cover, a spring, a spring plate, a heating wire, a high temperature resistant Composed of rubber sealing ring, metal sealing ring, O-ring and bolts. The spring is placed on the valve body at the upper part of the inlet, and its upper end is in contact with the spring plate; the spring plate can slide up and down along the inner wall of the valve body, and there is a groove at the center of the upper part; the spring plate is connected with the valve stem through the groove, The valve stem and the valve core are integrated; there is an oil and gas channel in the center of the valve stem, and there is a chamber between the top and the valve cover. The high temperature resistant rubber sealing ring is used to realize the dynamic seal between the valve stem and the valve cover; the valve seat is placed on the valve body On the boss in the middle, the seat fixing ring is used to realize the tightening and sealing, and the valve seat fixing ring is connected to the valve body through threads; there is a metal sealing ring between the heating wire and the valve cover, which can ensure the sealing at higher temperatures. reliability.

There is a drainage hole on the spring plate, oil and gas can pass through the drainage hole, and enter the chamber at the top of the valve stem from the oil and gas channel in the valve stem. The force phase is balanced, so when the wellhead pressure changes, the throttle valve will automatically adjust the throttle opening to ensure that the outlet pressure remains unchanged.

The present invention has the advantages of simple structure and reliable performance, once the throttle valve outlet pressure is selected, it will not change with the change of wellhead pressure, and the opening of the throttle opening can be automatically adjusted according to the change of wellhead pressure; the valve core has a heating wire , which can ensure a high temperature at the orifice and prevent the formation of hydrates; the heating of the heating wire adopts the combination of solar energy and electric energy, which not only saves energy, but also ensures its normal operation in harsh environments.

Description of drawings

Fig. 1 is a schematic diagram of a full-section structure of a ground constant pressure throttle valve according to the present invention.

In the figure: 1. Valve body, 2. Valve seat, 3. Valve seat fixing ring, 4. Valve core, 5. Valve stem, 6. Valve cover, 7. Spring, 8. Spring plate, 9. Heating wire, 10 .High temperature resistant rubber seal ring, 11. Bolt, 12. Metal seal ring, 13. O-ring seal, 14, inlet, 15. outlet.

Detailed ways

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:

As shown in Figure 1, a ground constant pressure throttle valve of the present invention is mainly composed of a valve body 1, a valve seat 2, a valve seat fixing ring 3, a valve core 4, a valve stem 5, a valve cover 6, a spring 7, and a spring plate 8. Composed of heating wire 9, high temperature resistant rubber sealing ring 10, metal sealing ring 12, O-shaped sealing ring 13 and bolt 11. The spring 7 is placed on the valve body 1 on the upper part of the inlet 14, and its upper end is in contact with the spring plate 8; the spring plate 8 can slide up and down along the inner wall of the valve body, and there is a groove at the upper center position; the spring plate 8 passes through the groove The groove is connected with the valve stem 5, and the valve stem 5 and the valve core 4 are integrated; there is an oil and gas channel in the center of the valve stem 5, and there is a chamber between the top and the valve cover 6, and the valve stem 5 and the valve cover 6 pass through a high temperature resistant The rubber sealing ring 10 realizes dynamic sealing; the valve seat 2 is placed on the boss in the valve body 1, and the tightening and sealing are realized through the valve seat fixing ring 3, and the valve seat fixing ring 3 is connected with the valve body 1 through threads; the heating wire There is a metal sealing ring 12 between 9 and the valve cover 6, which can ensure the reliability of sealing at higher temperatures.

As shown in Figure 1, the oil and gas at the wellhead enters the throttle valve from the inlet 14 of the throttle valve, and enters the valve cavity on the upper part of the spring plate 8 through the drainage hole on the spring plate; The valve cavity on the upper part of the spring plate 8 is connected to the hole, so oil and gas will enter the chamber at the top of the valve rod 5 along the hole in the valve rod 5 . The fluid entering the top chamber of the valve stem 5 will act on the top end surface of the valve stem 5, exerting a downward force on the valve stem 5, and this force will push the valve stem 5 to drive the valve core 4 to move downward until it meets the spring 7 forces are balanced. Since the fluid pressure acting on the top of the valve stem 5 will always be in balance with the reaction force of the spring 7, when the wellhead pressure fluctuates, the valve stem 5 drives the valve core 4 to move up and down under the action of the fluid pressure to adjust the opening of the orifice. degree, so that the pressure at the outlet 15 of the throttle valve remains constant. In addition, a heating wire 9 is inserted into the hole in the center of the valve stem 5 to heat the valve core 4, so that the valve core 4 can be maintained within a certain temperature range, so as to avoid the formation of hydrate due to too much pressure drop at the orifice; the heating wire ( 9) The heating can be combined with solar heating and electric heating, which not only saves costs, but also enables the throttle valve to work normally in harsh environments.

Claims (3)

1. A ground constant pressure throttle valve, mainly composed of valve body (1), valve seat (2), valve seat fixing ring (3), valve core (4), valve stem (5), valve cover (6) , spring (7), spring plate (8), heating wire (9), high temperature resistant rubber sealing ring (10), metal sealing ring (12), O-ring sealing ring (13) and bolts (11), its characteristics It is: the spring (7) is placed on the valve body (1) on the upper part of the inlet (14), and its upper end is in contact with the spring plate (8); the spring plate (8) can slide up and down along the inner wall of the valve body, and the upper part There is a groove in the center, and the spring plate (8) is connected with the valve stem (5) through the groove; the valve stem (5) and the valve core (4) are integrated, the center of the valve stem (5) has an oil and gas passage, and the top is connected with the valve stem (5). There is a chamber between the cover (6), and the dynamic seal is realized between the valve stem (5) and the valve cover (6) through a high temperature resistant rubber sealing ring (10); the valve seat (2) is placed in the valve body (1) On the boss, the seat fixing ring (3) is used to realize tightening and sealing, and the valve seat fixing ring (3) is connected with the valve body (1) through threads. 2. A ground constant pressure throttle valve according to claim 1, characterized in that there is a metal sealing ring (12) between the heating wire (9) and the valve cover (6), which can ensure Seal reliability. 3. A ground constant pressure throttle valve according to claim 1, characterized in that: a heating wire (9) is inserted into the hole in the center of the valve stem (5) to heat the valve core (4) to avoid throttling. The pressure drop at the mouth is too large to generate hydrate; the heating of the heating wire (9) can be combined with solar heating and electric heating.