CN201620836U - High-pressure gas well draws and penetrates dividing open gas well mining devices - Google Patents

Abstract

The high-pressure gas well injection intermittent gas well exploitation device is applied to gas field natural gas exploitation. The gas inlet of the high-pressure well heating furnace is connected with a high-pressure gas well through a pipeline, the gas outlet of the high-pressure well heating furnace is provided with a pipeline series valve, a needle valve and a plug valve, the outlet of the plug valve is provided with an inlet of a pipeline connection natural gas ejector, and the outlet of the natural gas ejector is provided with a pipeline connection throttle manifold; the gas inlet of the heating furnace is connected with a low-pressure gas well through a pipeline, and the gas outlet of the heating furnace is connected with a manifold through a pipeline; a pipeline from the gas outlet of the heating furnace to the throttle manifold is connected to a suction inlet of the natural gas ejector; and a valve, a needle valve, a flowmeter and a safety valve are connected in series on a pipeline from the tee joint to the suction inlet of the natural gas ejector. The effect is as follows: the high-pressure gas well is used for providing energy required by continuous production of the low-pressure gas well, and the open interval gas well with the casing pressure lower than 8MPa can be continuously and stably produced after the station entry pressure is reduced to the system pressure.

Description

Exploitation device for high-pressure gas well injection

technical field

The utility model relates to the technical field of natural gas exploitation, in particular to an injection extraction device for continuous and stable production of a gas well in the middle of gas well production in a gas gathering station of a gas field.

Background technique

Natural gas extraction plays a pivotal role in the development of the national economy, providing clean energy and raw materials for people's lives and industrial production.

During the development of gas wells, formation water, condensate water or condensate oil are often produced. Drainage gas recovery is currently the main process measure for gas well production. At present, drainage gas recovery process measures are often used in China: optimized pipe string drainage, gas lift drainage gas recovery, suction drainage, piston gas lift drainage gas recovery, electric submersible pump drainage gas recovery , jet pump drainage and gas recovery, foam drainage and gas recovery, etc.

After years of development in the Yulin gas field, the formation energy has decreased year by year, and the number of low-pressure and low-yield gas wells has increased year by year. At present, there are 39 low-production and low-efficiency gas wells, accounting for 22.67% of the total wells, and the average production of a single well is 0.24×10 ⁴ m ³ /d. Among the 39 gas wells, 23 gas wells are intermittent gas wells, and technological measures such as "increasing production with liquid + foam drainage for gas recovery" are adopted. Due to the small effective control range of the gas well, the low production of the gas well, and the poor liquid-carrying ability, when there is a lot of liquid accumulation, it still cannot carry the liquid normally after adding the foam discharge agent, and cannot continue to produce. In addition, some gas wells have low casing pressure. Due to the large production pressure difference, the pressure drops rapidly to the system pressure after the well is opened, and cannot be produced.

A simple and effective gas recovery device is developed to develop a method for exploiting interspaced gas wells, using the energy of one high-pressure gas well to inject multiple interspaced gas wells to enable continuous and stable production.

Utility model content

The purpose of the utility model is to provide a high-pressure gas well extraction device for inter-opening gas wells, which can safely and effectively mine inter-opening gas wells and increase the time rate of inter-opening gas wells. After the oil pressure drops to the system pressure, the gas well with lower casing pressure can still produce continuously and stably, and can carry liquid normally, so as to produce continuously and stably.

The technical scheme adopted in the utility model is: a high-pressure gas well injection room opening gas well mining device, mainly composed of a heating furnace, a high-pressure well heating furnace, a valve, a needle valve, a cock valve, a natural gas jet, a venting pipeline, a flow meter and a throttle tube Combination, characterized in that: the inlet of the high-pressure well heating furnace has a pipeline connected to a high-pressure gas well, the gas outlet of the high-pressure well heating furnace has a pipeline in series with a valve, a needle valve and a cock valve, and the outlet of the cock valve is connected to a natural gas jet by a pipeline There is a pipeline connecting the throttle manifold at the outlet of the natural gas injector. A tee is connected to the gas outlet pipeline of the high-pressure well heating furnace, and the pipeline connected by the tee is connected to the throttling manifold; there is a pipeline connected to the low-pressure gas well at the gas inlet of the heating furnace, and a pipeline is connected to the flow manifold at the gas outlet of the heating furnace .

A pipeline is connected through a tee on the pipeline from the gas outlet of the heating furnace to the throttling manifold, and the pipeline is connected to the suction port of the natural gas injector. A valve, a needle valve, a flow meter and a safety valve are connected in series on the pipeline from the tee to the suction port of the natural gas injector.

The exhaust port of the safety valve has a pipeline connected to the venting pipeline; the exhaust port of the plug valve has a pipeline connected to the venting pipeline.

The valve used is a DN65 gate valve, the needle valve is a DN50 needle valve, the plug valve is a DN50 plug valve, the flow meter is a DN20 flow meter, and the safety valve is a DN50 safety valve.

The working principle of the high-pressure gas well ejector opening gas well production device: refer to Figure 1. When one or more gas wells in the gas gathering station have insufficient formation energy and the pressure of the gas well is lower than the system pressure and cannot be produced normally, the gas flow from a low-pressure gas well is sucked by the high-pressure gas flow of a high-pressure gas well through the gas flow ejected by the natural gas ejector 6. That is to say, the natural gas in the low-pressure well enters the natural gas injector through the low-pressure mixing metering unit after the pressure and production adjustment are completed.

The natural gas from the high-pressure gas well is heated by the heating furnace 2, and enters the high-pressure natural gas channel after passing through the DN65 gate valve 3, the DN50 needle valve 4, and the vent cock valve 5, and is adjusted to the required pressure and output by the throttle needle valve 4. Throttling and decompression at the throat, the pressure drops to about 1MPa.

The gas from three low-pressure gas wells enters the station and is heated by the heating furnace. After passing through the DN65 gate valve, DN50 needle valve and flow meter 9, it merges with the gas from other low-pressure gas wells. The combined gas flow enters the natural gas injector 6. Natural gas is mixed, and the pressure after mixing is the system pressure. The mixed natural gas enters the pipeline in the high-pressure gas well station, enters the choke manifold 10, and is distributed to the metering separator in the choke manifold 10 for intermittent metering. The metered value is the sum of the high-pressure natural gas flow and the low-pressure natural gas flow.

Beneficial effects of the utility model: The utility model high-pressure gas well injection inter-opening gas well mining device uses high-pressure gas wells to provide the energy required for continuous production of low-pressure gas wells, and can reduce the pressure of inter-opening gas wells with casing pressure lower than 8MPa to the system pressure at the station Afterwards, the gas recovery and production can be carried out continuously and stably; the wellhead pressure of high-pressure and low-pressure gas wells can be stabilized, and the formation damage can be reduced; the amount of methanol injection in the gas production of natural gas wells can be reduced. Interspaced gas wells with casing pressure lower than 8MPa can produce normally and continuously; the operating time rate of intersected gas wells is improved; the pressure of main pipeline gas transmission of intersected gas wells is reduced, and the safety factor of pipelines is improved; the hydrate formation temperature is reduced.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model high-pressure gas well ejection inter-opening gas well exploitation device.

In the figure, 1. Heating furnace, 2. High-pressure well heating furnace, 3. Valve, 4. Needle valve, 5. Plug valve, 6. Natural gas injector, 7. Vent pipeline, 8. Safety valve, 9. Flow meter, 10. Throttle manifold.

Detailed ways

Embodiment 1: Taking a high-pressure gas well extraction device as an example, the utility model will be further described in detail.

See Figure 1. The utility model high-pressure gas well extraction room opening gas well mining device is mainly composed of a heating furnace 1, a high-pressure well heating furnace 2, a valve 3 (DN65 gate valve), a needle valve 4 (DN50 needle valve), a cock valve 5 (DN50 cock valve) ), natural gas injector 6, vent pipeline 7, flow meter 9 (DN20 flow meter) and throttling manifold 10.

The inlet of the high-pressure well heating furnace 2 has a pipeline connected to a high-pressure gas well, and the gas outlet of the high-pressure well heating furnace 2 has a pipeline connected in series with a valve 3, a needle valve 4 and a cock valve 5, and the outlet of the cock valve 5 is connected with a pipeline The inlet of the natural gas injector 6 and the exhaust port of the cock valve 5 are connected to the venting pipeline 7 by a pipeline; the outlet of the natural gas injector 6 is connected to a throttling manifold 10 by a pipeline, and a DN65 gate valve is connected to the pipeline.

A tee is connected to the gas outlet pipeline of the high-pressure well heating furnace 2, and the pipeline connected by the tee is connected to the throttling manifold 10, and a DN65 gate valve is connected to the pipeline.

There are pipelines connected to two low-pressure gas wells at the inlet of heating furnace 1, and two pipelines connected to flow manifold 10 at the two gas outlets of heating furnace 1, and a DN50 needle valve is connected to each pipeline.

The pipelines from the two gas outlets of the heating furnace 1 to the throttling manifold 10 are respectively connected with pipelines through a tee, and the pipelines are connected to the suction port of the natural gas injector 6 . A valve 3 , a needle valve 4 and a flowmeter 9 are connected in series on the pipeline from each tee to the suction port of the natural gas injector 6 . The pipeline is connected to the suction port of the natural gas injector 6 after summarizing. There is a safety valve 8 (DN50 safety valve) on the assembled pipeline.

The exhaust port of the safety valve 8 has a pipeline to connect the venting pipeline 7.

Claims (2)

1. A high-pressure gas well extraction device for opening a gas well, mainly consisting of a heating furnace (1), a high-pressure well heating furnace (2), a valve (3), a needle valve (4), a plug valve (5), and a natural gas injector (6), composed of venting pipeline (7), flowmeter (9) and throttle manifold (10), is characterized in that: the air inlet of high-pressure well heating furnace (2) has pipeline to connect a high-pressure gas well, and high-pressure well heating The gas outlet of the furnace (2) has a pipeline series connection valve (3), needle valve (4) and cock valve (5), and the outlet of the cock valve (5) has a pipeline connected to the inlet of the natural gas injector (6). The outlet of the device (6) has a pipeline connected to the throttling manifold (10); on the gas outlet pipeline of the high-pressure well heating furnace (2), a tee is connected, and the pipeline connected by the tee is connected to the throttling manifold (10); The inlet of the heating furnace (1) has a pipeline connected to the low-pressure gas well, and the gas outlet of the heating furnace (1) has a pipeline connected to the flow manifold (10); On the pipeline from the gas outlet of the heating furnace (1) to the throttling manifold (10), a pipeline is connected through a tee, and the pipeline is connected to the suction port of the natural gas injector (6); A valve (3), a needle valve (4), a flow meter (9) and a safety valve (8) are connected in series on the pipeline at the mouth; The exhaust port of the safety valve (8) has a pipeline connected to the venting pipeline (7); the exhaust port of the cock valve (5) has a pipeline connected to the venting pipeline (7). 2. The high-pressure gas well extraction device according to claim 1, characterized in that: the valve (3) is a DN65 gate valve, the needle valve (4) is a DN50 needle valve, and the plug valve (5) is a DN50 cock valve, and flow meter (9) is a DN20 flow meter, and safety valve (8) is a DN50 safety valve.