CN109424332B - Natural gas well constant pressure throttling arrangement - Google Patents
Natural gas well constant pressure throttling arrangement Download PDFInfo
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- CN109424332B CN109424332B CN201710720452.0A CN201710720452A CN109424332B CN 109424332 B CN109424332 B CN 109424332B CN 201710720452 A CN201710720452 A CN 201710720452A CN 109424332 B CN109424332 B CN 109424332B
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- piston
- natural gas
- pressure
- gas well
- shell
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
Abstract
The invention relates to a constant-pressure throttling device of a natural gas well, which comprises a shell and a piston capable of reciprocating in the shell, wherein one end of the piston is connected with an elastic device, the elastic device is fixed on a spring limiting piece, the other end of the piston is provided with an opening and limited by a piston limiting piece, the shell and the piston are respectively provided with a limiting hole communicated with a natural gas pipeline at the corresponding positions on the periphery, and the limiting hole is communicated with the opening of the piston through an inner cavity of the piston. The invention can realize the automatic adjustment of the size of the air nozzle of the throttling device, realize the constant pressure throttling, reduce the labor intensity, reduce the cost and improve the working efficiency.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation, in particular to a constant-pressure throttling device for a natural gas well.
Background
In the traditional natural gas exploitation process, the pressure in a gas well is high, and the purpose of stable production can be achieved only by installing a throttling and pressure reducing device at a wellhead to control the gas production rate of the gas well. In the process of throttling and depressurizing, the pressure of the natural gas is rapidly reduced after the natural gas passes through the throttling nozzle, the volume of the natural gas is rapidly increased, the temperature of the natural gas is also rapidly reduced, the natural gas usually contains a certain proportion of water, when the temperature of the natural gas is reduced to the formation condition of the hydrate, the hydrate is condensed, the hydrate can cause the blockage of ground equipment, and the normal production of the natural gas well is influenced. If the utility model discloses a chinese utility model patent that the grant bulletin number is CN203540770U, the grant bulletin day is 2014.04.16 provides a valve formula air cock device, this valve formula air cock device includes the valve body, the valve body inner chamber divide into epicoele and cavity of resorption, epicoele and cavity of resorption all are equipped with the gear shaft, be equipped with the gear on the gear shaft, connect through chain drive between the gear, the air cock is fixed on the chain, air cock subassembly takes place to drive the chain through the gear after blockking up and overhauls and change, and the device structure is comparatively complicated, need artifical inspection and manual change air cock subassembly in the use, influence the production progress, the efficiency is reduced.
Therefore, in recent years, underground throttling technology is developed at home and abroad, the ground throttling mode is switched into underground throttling, the throttling, pressure reducing, expansion, temperature reduction and heat absorption processes of natural gas are completed by utilizing the high-temperature environment of the underground, and the outlet temperature of the natural gas subjected to pressure reduction and throttling is increased, so that the freezing and blocking of hydrates are prevented, and the yield of gas wells is increased. Most of the throttleers used at present are fixed air nozzle throttleers, and throttling functions of different levels are realized by closing a well and replacing throttling nozzles of different sizes through throwing and dragging operations, so that the yield of a natural gas well cannot be adjusted in time, the production progress is influenced, and the operation cost and the risk are increased.
Disclosure of Invention
The invention aims to provide a constant-pressure throttling device for a natural gas well, and solves the problem that the gas well cannot normally produce due to the pressure and yield change of natural gas at different production periods, and the working efficiency is influenced.
In order to achieve the purpose, the first technical scheme of the constant-pressure throttling device for the natural gas well is as follows: the utility model provides a natural gas well constant voltage throttling arrangement, constant voltage throttling arrangement includes the casing and can be reciprocating motion's piston in the casing, piston one end is connected with resilient means, resilient means fixes on the spring locating part, the other end of piston is equipped with the opening and spacing through piston locating part, the position that casing and piston correspond respectively in the periphery is equipped with the restricted aperture that link up with natural gas line, the restricted aperture passes through the inner chamber of piston and the opening intercommunication of piston.
The second technical scheme of the constant-pressure throttling device for the natural gas well is as follows: the elastic device is composed of a pressure spring and a balance block, one end of the balance block is connected with a piston rod of the piston, the other end of the balance block is connected with the pressure spring, and the pressure spring is fixed on the spring limiting part.
The third technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the first technical scheme of the natural gas well constant-pressure throttling device, the shell is communicated with the flow limiting hole of the piston in an aligned mode, and the hole diameters of the shell and the flow limiting hole are consistent.
The fourth technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the second technical scheme of the natural gas well constant-pressure throttling device, a baffle is arranged between the piston and the balance block in the shell, and a guide hole for the piston rod to penetrate through is formed in the baffle.
The fifth technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the second or fourth technical scheme of the constant-pressure throttling device for the natural gas well, the balance block is provided with a groove, and the groove is convenient for the end part of the piston rod to be connected with the balance block and limits the piston rod and the piston to rotate in the shell in the radial direction.
The sixth technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the fifth technical scheme of the natural gas well constant-pressure throttling device, the number of the piston rods is one.
The seventh technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the first technical scheme of the natural gas well constant-pressure throttling device, two sides of the piston flow limiting hole are respectively provided with a sealing ring arranged along the circumferential direction of the piston.
The eighth technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the first or second technical scheme of the constant-pressure throttling device for the natural gas well, the spring limiting piece and the piston limiting piece are circular rings with external threads.
The ninth technical scheme of the constant-pressure throttling device for the natural gas well is as follows: on the basis of the eighth technical scheme of the constant-pressure throttling device for the natural gas well, the natural gas pipeline is connected with the shell through welding.
The invention has the beneficial effects that: the pressure of high-pressure gas coming through the natural gas pipeline on the piston and the combined action of the pressure spring elasticity on the balance block enable the piston to automatically adjust the opening size of the flow limiting hole according to the pressure of the high-pressure gas, the pressure at the gas outlet is unchanged, and therefore the gas well can be normally produced when the pressure and the yield of the natural gas in different production periods are changed.
Furthermore, the baffle plate is provided with a guide hole for the piston rod to pass through, the piston rod is positioned, and the piston rod is long and is not easy to break in the reciprocating motion process.
Furthermore, the balance block is provided with a groove, so that the piston rod is conveniently connected with the balance block, and the piston rod can be positioned.
Further, the sealing rings arranged along the circumferential direction of the piston are respectively arranged on two sides of the piston flow limiting hole, and the sealing rings can seal the contact part of the piston and the shell to prevent natural gas leakage.
Furthermore, the shell and the piston can be provided with one or more flow limiting holes at corresponding positions on the outer circumference according to the number of the natural gas pipelines, so that the production efficiency of the gas well can be improved.
Further, the natural gas pipeline is connected with the shell through welding, so that not only can the firmness of the connection position be guaranteed, but also the air tightness of the welding position is better.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a constant pressure natural gas well choke apparatus of the present invention;
FIG. 2 is a schematic view of a second embodiment of the constant pressure natural gas well choke apparatus of the present invention;
FIG. 3 is a schematic view of a third embodiment of the constant pressure natural gas well choke of the present invention;
FIG. 4 is a schematic view of a fourth embodiment of the constant pressure natural gas well choke of the present invention;
fig. 5 is a schematic view of a seventh embodiment of the constant pressure natural gas well choke apparatus of the present invention.
In the figure: 1. a pressure spring limiting part; 2. a pressure spring; 3. a counterbalance; 4. a housing; 5. a piston; 6. a seal ring; 7. a piston stop; 8. an air outlet; 9. a flow restriction orifice; 10. an air inlet; 11. an air intake line; 12. a piston rod; 13. a guide hole; 14; and (4) a groove.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The first embodiment of the constant-pressure throttling device for the natural gas well, as shown in fig. 1, is a constant-pressure throttling device for the natural gas well, and comprises a shell 4, a piston 5 and a balance block 3. Both ends are equipped with the screw hole about casing 4, are equipped with the pressure spring locating part 1 that is used for connecting pressure spring 2 on the left end screw hole, are equipped with on the right-hand member screw hole to be used for carrying on spacing piston locating part 7 to the piston rod, and pressure spring locating part 1 and piston locating part 7 combined action guarantee that the piston rod can reciprocating motion, can not break away from its motion range again. The position of the shell 4 corresponding to the upper side face of the piston 5 is provided with a flow limiting hole 9, the flow limiting hole 9 is communicated with an air inlet 10 of a natural gas inlet pipeline 11, the size of an opening is changed by the reciprocating movement of the piston 5 in the shell 4 through the flow limiting hole 9, and then the flow of natural gas entering the inner cavity of the piston 5 is changed, so that the flow limiting effect is achieved. The inner cavity of the piston 5 is communicated with the air outlet 8 through the piston limiting part 7 at the right end, so that the natural gas can be discharged in time, and the sealing rings 6 are arranged at the two ends of the flow limiting hole 9, so that the natural gas is prevented from diffusing to the left end of the shell 4 and leaking out after flowing into the flow limiting hole 9 and the inner cavity of the piston 5. The piston rod 12 at the left end of the piston 5 is connected with the groove 14 on the balance block 3 through the guide hole 13 on the baffle, the balance block 3 is connected with the pressure spring 2, and the guide hole 13 and the groove 14 play a role in positioning and guiding the piston rod, so that the piston rod 12 cannot incline or radially rotate in the reciprocating motion process, and the piston rod 12 is prevented from being broken due to overlarge stress.
Specifically, in the embodiment, during operation, natural gas in a gas well flows into the piston 5 and the flow-limiting hole 9 on the upper side of the housing 4 through the gas inlet 10 of the gas inlet pipeline 11, so as to enter the inner cavity of the piston 5, when the gas pressure of the gas inlet 10 is the same as that of the gas outlet 8, the flow-limiting holes 9 on the upper sides of the piston 5 and the housing 4 are aligned and communicated, the hole diameter is the same, the opening is the largest at the moment, and the gas pressure borne by the piston 5 and the elasticity of the pressure spring 2 reach balance. When the natural gas flow of the gas well is increased, the gas pressure at the position of the gas inlet 10 is increased, meanwhile, the pressure applied to the section of the inner cavity of the piston 5 is increased, the piston rod 12 on the piston 5 moves leftwards under the action of the pressure to push the balance block 3, the balance block 3 compresses the pressure spring 2, the piston 5 and the flow limiting hole 9 on the upper side of the shell 4 are relatively displaced, the opening of the flow limiting hole 9 is reduced, the flow-limiting pressure difference is generated, and therefore the gas pressure in the inner cavity of the piston 5 is reduced, and the outlet pressure is reduced. When the natural gas flow of the gas well is reduced, the gas pressure at the gas inlet 10 is reduced, meanwhile, the pressure applied to the section of the inner cavity of the piston 5 is reduced, the piston 5 moves rightwards under the action of the elastic force of the pressure spring 2, the piston 5 and the flow limiting hole 9 on the upper side surface of the shell 4 are displaced relatively, the opening of the flow limiting hole 9 is enlarged, and the outlet pressure of the gas outlet 8 is increased. The opening size of the flow limiting hole 9 is automatically adjusted ceaselessly by the piston 5 under the combined action of the gas pressure in the inner cavity of the piston 5 and the elastic force of the pressure spring 2, so that the outlet pressure is balanced all the time, and the purpose of constant pressure is realized.
The second embodiment of the constant-pressure throttling device for the natural gas well comprises the following components: as shown in fig. 2, the difference from the first embodiment is that the piston 5 and the compression spring are directly connected with the compression spring 2 without a balance weight 3 and a baffle plate therebetween.
The third embodiment of the constant-pressure throttling device for the natural gas well comprises the following components: as shown in fig. 3, the difference from the first embodiment is that no baffle is provided between the piston 5 and the weight 3 in the housing 4.
The embodiment four of the constant-pressure throttling device for the natural gas well comprises the following components: as shown in fig. 4, the difference from the first embodiment is that there are two piston rods 12, and there are two guide holes 13 on the corresponding baffle and two grooves 14 on the counterweight.
The fifth embodiment of the constant-pressure throttling device for the natural gas well comprises the following components: the difference from the first embodiment is that the sealing ring is a sealing gasket or a sealing ring.
The embodiment six of the constant-pressure throttling device for the natural gas well comprises the following components: the difference from the first embodiment is that the position-limiting member is a part that extends into the housing to serve as a stop portion, and the other part is provided with bolt holes and is fixed to two end portions of the housing through bolts.
The seventh embodiment of the constant-pressure throttling device for the natural gas well of the invention is as follows: as shown in fig. 5, the difference from the first embodiment is that the number of the natural gas pipelines is two, and the number of the corresponding air inlet holes 10 and the corresponding restriction holes 9 is also two.
The invention makes the piston move to and fro ceaselessly to adjust the opening size of the flow limiting hole through the combined action of the pressure generated by the flow of the natural gas entering the inner cavity of the piston and the elastic force of the pressure spring, so that the pressure in the air outlet is kept unchanged. The gas well gas nozzle can not cause the generation of natural gas hydrate due to sudden pressure reduction, and the size of the flow limiting hole can be automatically adjusted without replacing the gas nozzle according to the pressure generated by the natural gas, so that the normal production of the gas well is realized, and the efficiency is improved.
Claims (6)
1. A natural gas well constant pressure throttling arrangement which characterized in that: the constant-pressure throttling device comprises a shell and a piston which can do reciprocating motion in the shell, wherein one end of the piston is connected with an elastic device which is fixed on a spring limiting piece, the other end of the piston is provided with an opening and is limited by the piston limiting piece, the shell and the piston are respectively provided with a limiting hole communicated with a natural gas pipeline at the corresponding position on the periphery, the limiting hole is communicated with the opening of the piston through an inner cavity of the piston, the elastic device consists of a pressure spring and a balancing block, one end of the balancing block is connected with a piston rod of the piston, the other end of the balancing block is connected with the pressure spring which is fixed on the spring limiting piece, a baffle is arranged between the piston and the balancing block in the shell, a guide hole for the piston rod to pass through is arranged on the baffle, a groove is arranged on the balancing block, the end part of the piston rod is convenient to be connected with the balancing block, and the piston rod and the piston are limited to rotate in the shell in the radial direction, the pressure spring and the piston are respectively arranged at two ends of the balance block, which are opposite to each other, and the piston is enabled to ceaselessly and automatically adjust the opening size of the flow limiting hole under the combined action of the gas pressure of the inner cavity of the piston and the elasticity of the pressure spring.
2. The gas well constant pressure choke of claim 1, characterized in that: the shell is aligned and communicated with the flow limiting hole of the piston, and the hole diameter is consistent.
3. The gas well constant pressure choke of claim 1, characterized in that: the piston rod is one.
4. The gas well constant pressure choke of claim 1, characterized in that: and sealing rings arranged along the circumferential direction of the piston are respectively arranged on two sides of the piston flow limiting hole.
5. The gas well constant pressure choke of claim 1, characterized in that: the spring limiting part and the piston limiting part are circular rings with external threads.
6. The gas well constant pressure choke of claim 4, characterized in that: the natural gas pipeline is connected with the shell through welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710720452.0A CN109424332B (en) | 2017-08-21 | 2017-08-21 | Natural gas well constant pressure throttling arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710720452.0A CN109424332B (en) | 2017-08-21 | 2017-08-21 | Natural gas well constant pressure throttling arrangement |
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| Publication Number | Publication Date |
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| CN109424332A CN109424332A (en) | 2019-03-05 |
| CN109424332B true CN109424332B (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710720452.0A Active CN109424332B (en) | 2017-08-21 | 2017-08-21 | Natural gas well constant pressure throttling arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114233532B (en) * | 2021-12-30 | 2023-11-03 | 亚普汽车部件股份有限公司 | Flexible electric control valve, electric control fuel system and control method of electric control valve |
| CN114534890B (en) * | 2022-02-14 | 2023-10-20 | 陕西榆能创力智能装备有限公司 | Medium-speed multistage coal mill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201715057U (en) * | 2010-06-18 | 2011-01-19 | 同济大学 | Balance piston induction type pneumatic pressure relief valve |
| CN104343426A (en) * | 2013-08-02 | 2015-02-11 | 中国石油天然气股份有限公司 | System and technology for intelligent throttling in natural gas well |
| WO2016073675A1 (en) * | 2014-11-06 | 2016-05-12 | M-I L.L.C. | Piston choke control |
| CN106285580A (en) * | 2016-09-30 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN107061817A (en) * | 2017-02-03 | 2017-08-18 | 中国石油化工股份有限公司 | A kind of trequency piston type constant pressure valve |
-
2017
- 2017-08-21 CN CN201710720452.0A patent/CN109424332B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201715057U (en) * | 2010-06-18 | 2011-01-19 | 同济大学 | Balance piston induction type pneumatic pressure relief valve |
| CN104343426A (en) * | 2013-08-02 | 2015-02-11 | 中国石油天然气股份有限公司 | System and technology for intelligent throttling in natural gas well |
| WO2016073675A1 (en) * | 2014-11-06 | 2016-05-12 | M-I L.L.C. | Piston choke control |
| CN106285580A (en) * | 2016-09-30 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN107061817A (en) * | 2017-02-03 | 2017-08-18 | 中国石油化工股份有限公司 | A kind of trequency piston type constant pressure valve |
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| Publication number | Publication date |
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| CN109424332A (en) | 2019-03-05 |
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