Liquid blocking device for gas well

Abstract

The present invention discloses a liquid-blocking device for gas wells, which includes a valve body and a regulating component. The valve body includes a base and a piston. A gas transmission channel and an air inlet channel are provided in the piston. One end of the air inlet channel is connected to the gas transmission channel, and the piston is slidably arranged on the base. The piston sliding track has a first position in which the other end of the air inlet channel is connected to the oil and gas layer, and a second position in which the other end of the air inlet channel is pressed against the base and closed. The regulating component includes an airbag and a damping tube. One end of the airbag is connected to the base, and the other end is connected to the piston. One end of the damping tube is connected to the oil and gas layer, and the other end is connected to the airbag. Due to the different flow resistances of liquid and gas phase substances in the damping tube, the pressure drop ratios of the two are different, which causes the volume of the airbag to change, thereby driving the piston to switch between the first position and the second position. The above-mentioned liquid-blocking device for gas wells can automatically close the air inlet channel after the liquid phase substances accumulate in the oil and gas layer, thereby reducing the difficulty of controlling the blocking liquid phase substances.

Description

Technical Field

[0001] The invention relates to the field of oil and gas production, and in particular to a liquid blocking device for a gas well. Background Art

[0002] With the development of gas fields year by year, the production of gas wells has decreased significantly, the problem of liquid accumulation in wellbore is serious, and it is difficult to maintain stable production and manage gas fields. Liquid accumulation in gas wells has become an important factor affecting the production capacity of gas fields.

[0003] Usually, a liquid blocking device is used to block the accumulated liquid in the gas well to prevent the accumulated liquid from entering the gas transmission channel. The existing liquid blocking device can be found in the patent with application number CN201410711176.8, which determines the liquid accumulation in the gas well through pressure fluctuations, and then controls the on and off of the solenoid valve to switch the gas well between the liquid blocking state and the gas production state. However, this liquid blocking method requires accurate detection of the liquid accumulation in the gas well, and also requires accurate control of the solenoid valve according to the detection results. The above control is complicated and cumbersome, making the liquid blocking device prone to failure.

[0004] Therefore, how to reduce the difficulty of controlling the liquid phase material in the barrier gas well is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, propose a liquid blocking device for gas wells, and solve the technical problem of how to reduce the difficulty of controlling the liquid phase material in the gas well in the prior art.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A liquid blocking device for a gas well, comprising:

[0008] A valve body, comprising a base and a piston, wherein a gas transmission channel and an air intake channel are provided in the piston, wherein one end of the air intake channel is connected to the gas transmission channel, and the piston is slidably arranged on the base, and the sliding track of the piston has a first position in which the other end of the air intake channel is connected to the oil and gas layer, and a second position in which the other end of the air intake channel is pressed against the base and closed; and

[0009] A regulating component includes an airbag and a damping tube, wherein one end of the airbag is connected to the base, and the other end thereof is connected to the piston; one end of the damping tube is connected to the oil and gas layer, and the other end thereof is connected to the airbag; the volume of the airbag changes due to the different pressure drop ratios of the liquid and gas phase materials in the damping tube, thereby driving the piston to switch between the first position and the second position.

[0010] In some embodiments, a receiving cavity is provided in the base, the piston is slidably disposed in the receiving cavity, an exhaust channel is provided on the side wall of the valve body, and when the piston is in the first position, the exhaust channel is connected to the gas supply channel.

[0011] In some embodiments, the piston divides the accommodating chamber into a first chamber and a second chamber, and the airbag is installed in the first chamber.

[0012] In some embodiments, the gas delivery channel has a throat portion with a narrowed inner diameter, and the piston is provided with an air intake channel connecting the second chamber and the throat portion.

[0013] In some embodiments, there are multiple throats and necks, and the piston is provided with multiple air inlet channels, and the multiple air inlet channels correspond one-to-one to the multiple throats and necks.

[0014] In some embodiments, the airbag includes a bag body and an air core, one end of the bag body presses against the base, and the other end thereof presses against the piston, the bag body is connected to the damping tube, and a pressure relief port is opened at one end of the bag body, the air core is built into the other end of the bag body, and the air core has a third position penetrating through the pressure relief port, and has a fourth position detached from the pressure relief port.

[0015] In some embodiments, a guide cone is provided at one end of the pressure relief port facing the air core.

[0016] In some embodiments, there are multiple air inlet channels, and the multiple air inlet channels are connected to the same air delivery channel.

[0017] In some embodiments, the valve body further includes a filter screen, the filter screen and the valve body enclose an isolation chamber, the air inlet channel and the damping tube are connected to the isolation chamber, and are connected to the oil and gas layer via the isolation chamber.

[0018] In some embodiments, the damping tube is stacked and surrounds the outer periphery of the valve body.

[0019] When the oil and gas layer is mainly composed of gaseous substances, the viscosity of the gaseous substances is small, and the pressure drop ratio of the gaseous substances after passing through the damping tube is small, so that the airbag is in an expanded state, and then the piston is pushed to the first position by the airbag, and the gas-phase substances in the oil and gas layer are discharged through the air intake channel and the gas transmission channel. When the oil and gas layer is mainly composed of liquid-phase substances, the viscosity of the liquid-phase substances is significantly greater than that of the gas-phase substances, and the pressure drop ratio of the liquid-phase substances after passing through the damping tube is large, so that the airbag is in a contracted state, and then the piston is driven to the second position. At this time, the air intake channel is closed, and the liquid-phase substances in the oil and gas layer can be prevented from entering the air intake channel and the gas transmission channel. The above-mentioned liquid-blocking device for gas wells can automatically close the air intake channel after the liquid-phase substances accumulate in the oil and gas layer, reducing the difficulty of controlling the liquid-phase substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a liquid blocking device for a gas well provided in an embodiment of the present invention;

[0021] Figure 2 It is a local schematic diagram of point A provided in an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] Valve body 100, base 110, accommodating chamber 111, first chamber 1111, second chamber 1112, exhaust channel 112, piston 120, air delivery channel 121, throat 1211, air inlet channel 122, air suction channel 124, filter 130, regulating component 200, air bag 210, bag body 211, pressure relief port 2111, air core 212, damping tube 220. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] In order to solve the technical problem of how to reduce the difficulty of controlling barrier liquid phase substances, the present invention provides a liquid blocking device for a gas well, which can reduce the difficulty of controlling barrier liquid phase substances.

[0026] It should be noted that the liquid-blocking device for gas wells of the present invention is used for but not limited to natural gas wells, etc. For the convenience of explanation, in the present invention, only the application of the liquid-blocking device for gas wells to natural gas wells is taken as an example for explanation, and the principle of applying the liquid-blocking device for gas wells to other types of equipment is substantially the same as that applied to natural gas wells, and will not be elaborated here one by one.

[0027] See also Figure 1 , Figure 1 and Figure 2 It is a structural schematic diagram of a liquid-blocking device for gas wells in one embodiment of the present invention, wherein the liquid-blocking device for gas wells comprises a valve body 100 and a regulating assembly 200, wherein the valve body 100 comprises a base 110 and a piston 120, wherein a gas transmission channel 121 and an air intake channel 122 are provided in the piston 120, wherein one end of the air intake channel 122 is connected to the gas transmission channel 121, and the piston 120 is slidably disposed on the base 110, and the sliding trajectory of the piston 120 has a first position for connecting the other end of the air intake channel 122 to the oil and gas layer, and a second position for pressing the other end of the air intake channel 122 against the base 110 and closing it. The regulating component 200 includes an airbag 210 and a damping tube 220. One end of the airbag 210 is connected to the base 110, and the other end thereof is connected to the piston 120. One end of the damping tube 220 is connected to the oil and gas layer, and the other end thereof is connected to the airbag 210. Due to the different pressure drop ratios of the liquid and gas phase materials in the damping tube 220, the volume of the airbag 210 changes, thereby driving the piston 120 to switch between the first position and the second position.

[0028] In this embodiment, when the oil and gas layer is mainly composed of gas phase substances, the viscosity of the gas phase substances is small, and the pressure drop ratio of the gas phase substances after passing through the damping tube 220 is small, so that the airbag 210 is in an expanded state, and then the piston 120 is pushed to the first position by the airbag 210, and the gas phase substances in the oil and gas layer are discharged through the air inlet channel 122 and the gas transmission channel 121. When the oil and gas layer is mainly composed of liquid phase substances, the viscosity of the liquid phase substances is significantly greater than that of the gas phase substances, and the pressure drop ratio of the liquid phase substances after passing through the damping tube 220 is large, so that the airbag 210 is in a contracted state, and then the piston 120 is driven to the second position. At this time, the air inlet channel 122 is closed, and the liquid phase substances in the oil and gas layer can be prevented from entering the air inlet channel 122 and the gas transmission channel 121. The above-mentioned liquid blocking device for gas wells can automatically close the air inlet channel 122 after the liquid phase substances accumulate in the oil and gas layer, reducing the difficulty of controlling the blocking of the liquid phase substances.

[0029] In some embodiments, a receiving chamber 111 is defined in the base 110 , the piston 120 is slidably disposed in the receiving chamber 111 , and a gas exhaust passage 112 is defined on the side wall of the valve body 100 , and when the piston 120 is in the first position, the gas exhaust passage 112 is connected to the gas supply passage 121 .

[0030] In this embodiment, the piston 120 is placed in the accommodating chamber 111. On the one hand, the piston 120 can be protected to prevent the movement of the piston 120 from being affected by external factors, and on the other hand, the inner wall of the accommodating chamber 111 can play a role of limiting and guiding the piston 120, so that the piston 120 has a precise sliding track. In addition, when the piston 120 is in the first position, the exhaust channel 112 is connected to the gas transmission channel 121, and the natural gas in the gas transmission channel 121 can be smoothly discharged through the exhaust channel 112.

[0031] In some embodiments, the piston 120 divides the accommodating chamber 111 into a first chamber 1111 and a second chamber 1112 , and the airbag 210 is installed in the first chamber 1111 .

[0032] In this embodiment, the airbag 210 is placed in the first chamber 1111 , and the inner wall of the first chamber 1111 limits the airbag 210 , forcing the airbag 210 to deform along its axial direction when the airbag 210 expands or contracts.

[0033] On the basis of the above embodiments, in some of the embodiments, the air delivery channel 121 has a throat portion 1211 with a narrowed inner diameter, and the piston 120 is provided with an air intake channel 124 communicating with the second chamber 1112 and the throat portion 1211 .

[0034] In this embodiment, due to the narrowing of the inner diameter of the throat and neck 1211, the air flow speed in the throat and neck 1211 is accelerated, and the negative pressure generated by the high-speed air flow will absorb the gas in the second chamber 1112 through the air supply channel 121, so that the piston 120 continues to move toward the first position, avoiding the problem that the piston 120 cannot fully reach the first position due to insufficient thrust of the airbag 210.

[0035] In some embodiments, there are multiple throats and necks 1211 , and the piston 120 is provided with multiple air suction channels 124 , and the multiple air suction channels 124 correspond to the multiple throats and necks 1211 one by one.

[0036] In this embodiment, a plurality of throats and necks 1211 and air intake channels 124 that cooperate with each other are provided simultaneously, so that the force on the piston 120 can be more uniform, thereby preventing the piston 120 from slightly deflecting due to uneven force during the sliding process.

[0037] In some of the embodiments, the airbag 210 includes a bag body 211 and an air core 212. One end of the bag body 211 presses against the base 110, and the other end presses against the piston 120. The bag body 211 is connected to the damping tube 220, and a pressure relief port 2111 is provided at one end of the bag body 211. The air core 212 is built into the other end of the bag body 211, and the air core 212 has a third position passing through the pressure relief port 2111, and has a fourth position detached from the pressure relief port 2111.

[0038] In this embodiment, when the pressure output by the damping tube 220 is relatively high, the bladder 211 is in an expanded state, so that the air core 212 reaches the fourth position away from the pressure relief port 2111. When the pressure output by the damping tube 220 is relatively low, the bladder 211 is in a contracted state, so that the air core 212 is in the third position through the pressure relief port 2111, thereby obstructing or even preventing the fluid from passing through the pressure relief port 2111. This makes the bladder 211 still have a certain volume even in a contracted state, rather than shrinking and becoming smaller without limit.

[0039] In some embodiments, a guiding cone is formed at one end of the pressure relief port 2111 facing the air core 212 .

[0040] In this embodiment, under the guiding effect of the guiding wedge surface, the air core 212 can be more easily aligned with the pressure relief port 2111 .

[0041] In some embodiments, there are multiple air inlet channels 122 , and the multiple air inlet channels 122 are connected to the same air delivery channel 121 .

[0042] In this embodiment, multiple air inlet channels 122 are provided simultaneously, which can improve the efficiency of exporting natural gas.

[0043] In some embodiments, the valve body 100 further includes a filter screen 130 , the filter screen 130 and the valve body 100 enclose an isolation chamber, the air inlet channel 122 and the damping tube 220 are connected to the isolation chamber, and are connected to the oil and gas layer via the isolation chamber.

[0044] In this embodiment, the filtering of the filter 130 can prevent impurities from entering the isolation cavity, thereby preventing the impurities from clogging the damping tube 220 or the air intake channel 122 .

[0045] In some embodiments, the damping tube 220 is stacked and surrounds the outer circumference of the valve body 100 .

[0046] In this embodiment, the longer the damping tube 220 is, the greater the pressure difference between the liquid phase substance and the gas phase substance after passing through the damping tube 220 is, and the liquid phase substance and the gas phase substance in the oil and gas layer can be distinguished more accurately.

[0047] In order to better understand the present invention, the following Figure 1 and Figure 2 The technical solution of the present invention is described in detail:

[0048] When the oil and gas layer is mainly composed of gas phase substances, the viscosity of the gas phase substances is small, and the pressure drop ratio of the gas phase substances after passing through the damping tube 220 is small, so that the airbag 210 is in an expanded state, and then the piston 120 is pushed to the first position by the airbag 210, and the gas phase substances in the oil and gas layer are discharged through the air inlet channel 122 and the air delivery channel 121. As the air flow speed in the throat 1211 is accelerated, the negative pressure generated by the high-speed air flow will absorb the gas in the second chamber 1112 through the air delivery channel 121, so that the piston 120 continues to move to the first position, avoiding the failure of the piston 120 to completely reach the first position due to insufficient thrust of the airbag 210. When the oil and gas layer is mainly liquid phase material, since the viscosity of the liquid phase material is significantly greater than that of the gas phase material, the pressure drop ratio of the liquid phase material after passing through the damping tube 220 is very large, so that the air bag 210 is in a contracted state, thereby driving the piston 120 to reach the second position, at which time the air inlet channel 122 is closed, thereby preventing the liquid phase material in the oil and gas layer from entering the air inlet channel 122 and the gas transmission channel 121. The above-mentioned liquid blocking device for gas wells can automatically block the air inlet channel 122 after the liquid phase material accumulates in the oil and gas layer, reducing the difficulty of controlling the liquid phase material.

[0049] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A liquid blocking device for a gas well, characterized in that: include: A valve body, comprising a base and a piston, wherein a gas transmission channel and an air intake channel are provided in the piston, wherein one end of the air intake channel is connected to the gas transmission channel, and the piston is slidably arranged on the base, and the piston sliding track has a first position for connecting the other end of the air intake channel to the oil and gas layer, and a second position for pressing the other end of the air intake channel against the base to be closed; as well as A regulating component includes an airbag and a damping tube, wherein one end of the airbag is connected to the base, and the other end thereof is connected to the piston; one end of the damping tube is connected to the oil and gas layer, and the other end thereof is connected to the airbag; the volume of the airbag changes due to the different pressure drop ratios of the liquid and gas phase materials in the damping tube, thereby driving the piston to switch between the first position and the second position.

2. The liquid blocking device for gas wells according to claim 1, characterized in that: The base is provided with a containing cavity, the piston is slidably disposed in the containing cavity, and the side wall of the valve body is provided with an exhaust passage, and when the piston is in the first position, the exhaust passage is butted against the gas delivery passage.

3. The liquid blocking device for gas wells according to claim 2, characterized in that: The piston divides the accommodating chamber into a first chamber and a second chamber, and the airbag is installed in the first chamber.

4. The liquid blocking device for gas wells according to claim 3, characterized in that: The air delivery channel has a throat portion with a narrowed inner diameter, and the piston is provided with an air intake channel communicating with the second chamber and the throat portion.

5. The liquid blocking device for gas wells according to claim 4, characterized in that: There are multiple throats and necks, and the piston is provided with multiple air intake passages, and the multiple air intake passages correspond to the multiple throats and necks one by one.

6. The liquid blocking device for gas wells according to claim 1, characterized in that: The airbag includes a bag body and an air core, one end of the bag body presses against the base, and the other end thereof presses against the piston, the bag body is connected to the damping tube, and a pressure relief port is opened at one end of the bag body, the air core is built into the other end of the bag body, and the air core has a third position penetrating through the pressure relief port, and has a fourth position detached from the pressure relief port.

7. The liquid blocking device for gas wells according to claim 6, characterized in that: A guiding cone surface is formed at one end of the pressure relief port facing the air core.

8. The liquid blocking device for gas wells according to claim 1, characterized in that: There are multiple air intake channels, and the multiple air intake channels are connected to the same air delivery channel.

9. The liquid blocking device for gas wells according to claim 1, characterized in that: The valve body further comprises a filter screen, wherein the filter screen and the valve body together enclose an isolation chamber, the air inlet passage and the damping tube are connected to the isolation chamber, and are connected to the oil and gas layer via the isolation chamber.

10. The liquid blocking device for gas wells according to claim 1, characterized in that: The damping tube is stacked and surrounds the outer periphery of the valve body.

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