A high-efficiency defoaming device for gas fields

Abstract

The present invention discloses a gas field high-efficiency defoaming device, characterized in that: it comprises a defoaming tank (10), the top of the tank body of the defoaming tank (10) is provided with an exhaust pipeline; the upper part of the tank body is provided with a reagent pipeline; the lower part of the tank body is provided with an air intake pipeline and a drainage pipeline, the drainage pipeline is located below the air intake pipeline; the bottom of the tank body is provided with a sewage pipeline; the inside of the tank body is provided with a fog catching net, a uniform distributor, a filter, and a steam trap from top to bottom, wherein the uniform distributor is connected to the reagent pipeline; the steam trap is connected to the drainage pipeline. The beneficial effects of the present invention include: it can greatly improve the defoaming effect, can achieve full consumption of the foaming agent, the defoaming liquid is automatically discharged through the steam trap, and secondary foaming and chemical agents are prevented from entering the dehydration station, which provides a reliable guarantee for the promotion of the foam drainage process in the gas field. It has low cost and is convenient to use in the later stage, which is conducive to the widespread promotion and use in gas fields.

Description

Technical Field

[0001] The invention relates to the field of oil and gas exploitation, and in particular to a gas field high-efficiency defoaming device. Background Art

[0002] With the continuous development of gas fields, the production capacity of gas wells has been decreasing, the formation energy has decreased, the liquid has slipped seriously, the drainage capacity is poor, and the wellbore has serious liquid accumulation. The gas well cannot rely on the formation energy to bring the accumulated liquid out of the wellbore. It is necessary to use the drainage gas production process to remove the wellbore liquid accumulation and maintain the stable production of the gas well. At present, the main drainage gas production processes used in domestic gas fields are mechanical drainage and chemical drainage. Among them, foam drainage gas production is simple to operate and low in cost and is widely used. The foam drainage gas production process is to inject a foaming agent into the wellbore to make the liquid in the well produce foam in the wellbore, reduce the density of the liquid in the wellbore, and improve the gas carrying capacity. However, since the discharged liquid contains a large amount of foam, it cannot be directly separated by the separator. If the defoaming is not thorough, it will enter the dehydration station from the pipeline network with the airflow, reducing the dehydration effect of the triethylene glycol solution, resulting in limited application of the foam drainage gas production process. The current drainage gas production processes such as plungers and gas lifts are gradually becoming less effective due to the influence of formation pressure, and some gas wells are flooded or the gas production decreases.

[0003] In order to promote the application of foam drainage and gas production technology, a high-efficiency defoaming device is specially developed to improve the defoaming effect. However, the defoaming device in the prior art has the problems of poor defoaming effect, waste of defoaming agent, and troublesome post-treatment of waste liquid. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a gas field efficient defoaming device, which has good defoaming effect, fully utilizes the defoaming agent, and realizes waste liquid separation at the same time.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-efficiency defoaming device for a gas field, characterized in that it comprises a defoaming tank, the top of which is provided with an exhaust pipeline; the upper part of the tank is provided with a reagent pipeline; the lower part of the tank is provided with an air intake pipeline and a drainage pipeline, the drainage pipeline is located below the air intake pipeline; the bottom of the tank is provided with a sewage pipeline; a mist catching net, a uniform distributor, a filter, and a steam trap are sequentially arranged inside the tank from top to bottom, wherein the mist catching net separates the exhaust pipeline from the uniform distributor, the uniform distributor is connected to the reagent pipeline; and the steam trap is connected to the drainage pipeline.

[0007] Furthermore, the filter is composed of a plurality of cyclone sheet filters, each of which is composed of a plurality of steel sheets arranged and stacked at a specific angle, and the steel sheets between two adjacent layers of cyclone sheet filters are arranged at opposite angles.

[0008] Further, the filter is located above the air inlet of the air intake line.

[0009] Furthermore, the uniform distributor is conical in shape, the upper part of which is connected to the pharmaceutical pipeline, and the bottom of which has a plurality of evenly distributed circular holes, and each circular hole is provided with an equal-diameter circular tube with an oblique angle of 45°.

[0010] Furthermore, the mist catching net is a mist catching device made of interwoven steel wires.

[0011] The beneficial effects of the present invention include: being able to greatly improve the defoaming effect, achieving full consumption of the foaming agent, and automatically discharging the defoaming liquid through the steam trap, thereby avoiding secondary foaming and chemical agents from entering the dehydration station, and providing a reliable guarantee for the promotion of the foam drainage process in gas fields. The cost is low, and the later use is convenient, which is conducive to the widespread promotion and use in gas fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0014] A kind of Figure 1 A high-efficiency defoaming device for a gas field is shown, characterized in that it includes a defoaming tank 10, the top of the tank body of which is provided with an exhaust pipeline 1; the upper part of the tank body is provided with a reagent pipeline 3; the lower part of the tank body is provided with an air intake pipeline 6 and a drainage pipeline 8, and the drainage pipeline 8 is located below the air intake pipeline 6; the bottom of the tank body is provided with a sewage pipeline 9; the inside of the tank body is provided with a mist catching net 2, a uniform distributor 4, a filter 5, and a steam trap 7 in sequence from top to bottom, wherein the uniform distributor 4 is connected to the reagent pipeline 3; and the steam trap 7 is connected to the drainage pipeline 8. The device is a skid-mounted device. The gas from the wellhead enters the defoaming device after being separated by a separator. The airflow carrying foam enters the device from the bottom and forms convection with the chemical agent injected from the top. The airflow passes through the filter, which increases the gas-liquid contact area, so that the gas-liquid two phases react fully and the foam in the airflow is eliminated. After the natural gas is defoamed, it is filtered through a mist catcher 2 to prevent residual foam from flowing out and entering the pipeline network. After the foam reacts with the chemical agent, saturated water is formed, which is automatically discharged through a steam trap 7 to prevent the produced liquid from being carried away by the airflow and causing secondary foaming. The sewage is discharged through a sewage pipeline 9 and enters a sewage tank (pool), completing the defoaming process.

[0015] The filter 5 used in the embodiment of the present invention is composed of a plurality of cyclone sheet filters, each of which is composed of a plurality of steel sheets arranged and stacked at a specific angle, and the steel sheets between two adjacent layers of cyclone sheet filters are arranged at opposite angles. The number of layers of the cyclone sheet filter can be adjusted according to the change in the gas volume of the gas well. The filter 5 is located above the air inlet of the air inlet pipeline 6, so that the bubble-carrying gas can be in a cyclone shape when passing through the filter 5. As the flow rate changes, the foam adheres to the filter sheet surface and contacts the defoaming agent impacting from the downstream.

[0016] In this embodiment, the uniform distributor 4 is conical, the upper part of which is connected to the drug pipeline 3, and the bottom of which has a number of evenly distributed circular holes, and each circular hole is provided with an equal-diameter circular tube with an angle of 45°, so that the drug can be evenly dispersed to form a jet.

[0017] The mist catcher net 2 is a mist catcher made of interwoven steel wires and is used to pass residual foam in the gas to prevent the foam from entering the exhaust pipeline 1 .

[0018] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A gas field efficient defoaming device, characterized by: The invention comprises a defoaming tank (10), wherein the top of the tank body of the defoaming tank (10) is provided with an exhaust pipeline (1); the upper part of the tank body is provided with a medicine pipeline (3); the lower part of the tank body is provided with an air intake pipeline (6) and a drainage pipeline (8), wherein the drainage pipeline (8) is located below the air intake pipeline (6); the bottom of the tank body is provided with a sewage pipeline (9); the interior of the tank body is provided with a mist catching net (2), a uniform distributor (4), a filter (5), and a drain valve (7) in sequence from top to bottom, wherein the mist catching net (2) separates the exhaust pipeline (1) and the uniform distributor (4), and the uniform distributor (4) is connected to the medicine pipeline (3); the filter (5) is composed of a plurality of cyclone sheet filters, each of which is composed of a plurality of steel sheets arranged and stacked at a set angle, and the steel sheets between two adjacent layers of cyclone sheet filters are arranged at opposite angles; and the drain valve (7) is connected to the drainage pipeline (8).

2. A gas field efficient defoaming device according to claim 1, characterized in that: The filter (5) is located above the air inlet of the air inlet line (6).

3. A gas field efficient defoaming device according to claim 1, characterized in that: The uniform distributor (4) is conical in shape, with its upper portion connected to the drug pipeline (3), and its bottom having a plurality of uniformly distributed circular holes, and each circular hole is provided with a circular tube of equal diameter at an angle of 45°.

4. A gas field efficient defoaming device according to claim 1, characterized in that: The mist catching net (2) is a mist catching device made of interwoven steel wires.

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