阅读说明：本技术 油井采出液有毒易燃气体处理及再利用方法及专用装置 (Method for treating and recycling poisonous and flammable gas in oil well produced liquid and special device ) 是由 王方 白刚 党延辉 赵志华 马晓军 哈德力·哈布都斯 张宏伟 张少阳 于 2020-05-09 设计创作，主要内容包括：本发明涉及稠油热采出液除硫技术领域,是一种油井采出液有毒易燃气体处理及再利用方法及专用装置,前者对单井来液经过两次气液分离,分离得到的包括硫化氢等有毒易燃气体经射流器进入燃气锅炉中燃烧。本发明采用水冷方式代替现有风冷方式,冷却后得到的硫化氢气体等有毒气体采用射流器汇到燃气锅炉参与燃烧,节约能源浪费和防止环境污染；另外,硫化氢气体采用射流器汇到燃气锅炉的燃气中,不需要额外增加硫化氢气体碱液中和装置；基于换热降温液化后的有毒、易燃气体较少,建设专门的气体收集装置,此建设投资巨大,收效甚微；而本装置既无需气体收集装置的建设,又达到了除硫的目的,同时对热能二次利用。(The invention relates to the technical field of sulfur removal of thick oil hot produced liquid, in particular to a method for treating and recycling poisonous and combustible gas of oil well produced liquid and a special device. The invention adopts a water cooling mode to replace the existing air cooling mode, toxic gases such as hydrogen sulfide gas and the like obtained after cooling are gathered to the gas boiler by the ejector to participate in combustion, thereby saving energy waste and preventing environmental pollution; in addition, the hydrogen sulfide gas is converged into the fuel gas of the gas-fired boiler by adopting the ejector, and an additional hydrogen sulfide gas alkali liquor neutralization device is not needed; toxic and inflammable gases are less after heat exchange, temperature reduction and liquefaction, a special gas collecting device is built, the construction investment is huge, and the effect is very little; the device does not need the construction of a gas collecting device, achieves the aim of removing sulfur and simultaneously utilizes heat energy for the second time.)

1. A method for treating and recycling poisonous and flammable gas in oil well produced liquid is characterized by comprising the following steps: the single-well incoming liquid is subjected to first gas-liquid separation to obtain a first separated gas phase and a first separated liquid phase, the first separated gas phase is subjected to heat exchange and temperature reduction in a water cooling mode to obtain a gas-liquid mixture, the gas-liquid mixture is subjected to second gas-liquid separation to obtain toxic inflammable gas and a second separated liquid phase, and the toxic inflammable gas is sent into a combustion chamber of a gas boiler through an ejector to be combusted; the first-time separated gas-phase water-cooling heat exchange cooling inlet water comes from water of the gas boiler, and the first-time separated gas-phase water-cooling heat exchange cooled return water returns to the gas boiler.

2. The method for treating and recycling the toxic and combustible gas in the oil well produced liquid according to claim 1, wherein the liquid coming from a single well is subjected to first gas-liquid separation by a first gas-liquid separator to obtain a first separated gas phase and a first separated liquid phase, the first separated gas phase is subjected to heat exchange and temperature reduction by a water-cooled heat exchanger to obtain a gas-liquid mixture, the gas-liquid mixture is subjected to second gas-liquid separation by a second gas-liquid separator to obtain the toxic and combustible gas and a second separated liquid phase, and the toxic and combustible gas is fed into a combustion chamber of a gas boiler for combustion by a jet device; the water inlet of the water-cooled heat exchanger is from water of the gas-fired boiler, the return water of the water-cooled heat exchanger returns to the gas-fired boiler, and the first separation liquid phase and the second separation liquid phase enter the oil storage tank through respective oil transfer pumps; when the gas-fired boiler is stopped, the toxic inflammable gas is obtained by the secondary gas-liquid separation and is burnt and emptied.

3. A special apparatus for implementing the method for treating and recycling poisonous and flammable gas in oil well produced fluid as claimed in any one of claims 1 or 2, the device is characterized by comprising a first gas-liquid separator, a second gas-liquid separator, a water-cooled heat exchanger, an ejector, a gas boiler and an oil storage tank, wherein the gas outlet end of the first gas-liquid separator is communicated with the inlet of a hot fluid channel of the water-cooled heat exchanger, the outlet of the hot fluid channel of the water-cooled heat exchanger is communicated with the inlet of the second gas-liquid separator, a hydrogen sulfide gas pipeline is communicated between the gas outlet end of the second gas-liquid separator and the left port of the ejector, the gas outlet end of the ejector is communicated with the gas inlet end of the gas boiler, the liquid outlet end of the first gas-liquid separator is communicated with the liquid inlet end of the oil storage tank through a first liquid inlet pipeline, the liquid outlet end of the second gas-liquid separator is communicated with the liquid inlet end.

4. The special device as claimed in claim 3, wherein the inlet of the cold fluid channel of the water-cooled heat exchanger is communicated with the water outlet end of the gas boiler through a water supply pipeline, the outlet of the cold fluid channel of the water-cooled heat exchanger is communicated with the water inlet end of the gas boiler through a water return pipeline, a water supply pump is connected in series to the water supply pipeline, and a water return pump is connected in series to the water return pipeline; and a first oil transfer pump and a second oil transfer pump are respectively connected in series on the first liquid inlet pipeline and the second liquid inlet pipeline.

5. The special device according to claim 4, further comprising a control unit, a touch screen display, the touch screen display being electrically connected to the control unit; a water supply pipeline close to the inlet of the cold fluid channel is provided with a water supply temperature sensor, a water return pipeline close to the outlet of the cold fluid channel is provided with a water return temperature sensor, the water supply temperature sensor and the water return temperature sensor are respectively and electrically connected with the signal input end of a control unit, and the control unit is respectively and electrically connected with the control input end of a motor of the water supply pump and the control input end of a motor of the water return pump; the first gas-liquid separator and the second gas-liquid separator are respectively provided with a first liquid level sensor and a second gas-liquid level sensor, the first liquid level sensor and the second gas-liquid level sensor are respectively electrically connected with the control unit, and the control unit is respectively electrically connected with the motor of the first oil delivery pump and the control input end of the motor of the second oil delivery pump.

6. The special device according to claim 5, characterized in that an electromagnetic valve is connected in series with the vent line, a pressure sensor is arranged on the hydrogen sulfide gas line between the vent line and the gas outlet end of the second gas-liquid separator, the pressure sensor is electrically connected with a control unit, and the control unit is electrically connected with the electromagnetic valve.

7. The special device as claimed in claim 5 or 6, wherein the lower part of the oil storage tank is communicated with an oil outlet line, a third oil transfer pump is connected in series on the oil outlet line, and a breather valve is arranged at the top of the oil storage tank.

8. The special device as claimed in claim 5 or 6, characterized in that a third liquid level sensor is arranged on the oil storage tank, the third liquid level sensor is electrically connected with the control unit, and the control unit is electrically connected with a control input end of a motor of the third oil transfer pump.

9. The special device as claimed in claim 7, wherein a third liquid level sensor is arranged on the oil storage tank, the third liquid level sensor is electrically connected with the control unit, and the control unit is electrically connected with a control input end of a motor of the third oil transfer pump.

10. The special device according to claim 3 or 4 or 5 or 6 or 9, characterized in that the liquid inlet end of the first gas-liquid separator is communicated with a single-well liquid inlet pipeline.

Technical Field

The invention relates to the technical field of oil field produced liquid gas treatment, in particular to a method and a special device for treating and recycling poisonous and combustible gas of oil well produced liquid, and particularly relates to a method and a special device for treating and recycling poisonous and combustible gas of thick oil well produced liquid.

Background

The oil field heavy crude oil exploitation usually adopts a thermal exploitation method of injecting high-temperature high-pressure steam into an oil layer to reduce the viscosity of crude oil, oil well produced liquid contains a large amount of combustible gas, hydrogen sulfide and high-temperature steam, the produced liquid is collected into an oil storage tank, gas escapes from the top of the oil storage tank, the escaped combustible gas and hydrogen sulfide can cause great threat to the environment and personnel safety, and the escaped high-temperature high-pressure steam can cause a large amount of energy waste. In order to solve the problems, generally, an air cooling mode is adopted, the temperature of incoming heavy crude oil is reduced and cooled before entering an oil storage tank, high-temperature water vapor is condensed into liquid to absorb hydrogen sulfide gas, most of the hydrogen sulfide gas in produced liquid is eliminated, and the residual hydrogen sulfide gas is neutralized and filtered through an alkali liquor tank.

In order to eliminate toxic and harmful gases in produced liquid, the high-temperature produced liquid containing hydrogen sulfide and combustible gas is cooled by air cooling, and the hydrogen sulfide is neutralized by alkali liquor, which has two problems. (1) In order to facilitate the production of the heavy crude oil, the heavy crude oil in the stratum needs to be heated at high temperature, the flowability of the heavy crude oil is increased, and a large amount of heat energy needs to be consumed. The air cooling temperature reduction causes that a large amount of heat energy can not be reused, and a large amount of heat energy is wasted. (2) Residual hydrogen sulfide gas is neutralized by alkali liquor, liquid needs to be frequently replaced by operators, labor cost is increased, and the whole device cannot automatically run and is unattended.

Disclosure of Invention

The invention provides a method for treating and recycling toxic and combustible gas of oil well produced liquid and a special device, overcomes the defects of the prior art, and can effectively solve the problems of heat energy waste and high labor cost of the existing method for removing the toxic and combustible gas of thick oil hot produced liquid.

One of the technical schemes of the invention is realized by the following measures: the invention relates to a method for treating and recycling poisonous and flammable gas in oil well produced liquid, which adopts the following measures to realize the following technical scheme: a special device for processing and recycling the poisonous and flammable gas in the oil well produced liquid in the technical proposal comprises a first gas-liquid separator, a second gas-liquid separator and a water-cooling heat exchanger, the ejector comprises an ejector, a gas boiler and an oil storage tank, wherein the gas outlet end of a first gas-liquid separator is communicated with the inlet of a hot fluid channel of a water-cooled heat exchanger, the outlet of the hot fluid channel of the water-cooled heat exchanger is communicated with the inlet of a second gas-liquid separator, a hydrogen sulfide gas pipeline is communicated between the gas outlet end of the second gas-liquid separator and the left port of the ejector, the gas outlet end of the ejector is communicated with the gas inlet end of the gas boiler, the liquid outlet end of the first gas-liquid separator is communicated with the liquid inlet end of the oil storage tank through a first liquid inlet pipeline, the liquid outlet end of the second gas-liquid separator is communicated with the liquid inlet end of the oil storage tank through a second.

The following is further optimization or/and improvement of the technical scheme of the invention:

the inlet of the cold fluid channel of the water-cooling heat exchanger is communicated with the water outlet end of the gas-fired boiler through a water supply pipeline, the outlet of the cold fluid channel of the water-cooling heat exchanger is communicated with the water inlet end of the gas-fired boiler through a water return pipeline, a water supply pump is connected on the water supply pipeline in series, and a water return pump is connected on the water return pipeline in series; and a first oil transfer pump and a second oil transfer pump are respectively connected in series on the first liquid inlet pipeline and the second liquid inlet pipeline.

The touch screen display is electrically connected with the control unit; a water supply pipeline close to the inlet of the cold fluid channel is provided with a water supply temperature sensor, a water return pipeline close to the outlet of the cold fluid channel is provided with a water return temperature sensor, the water supply temperature sensor and the water return temperature sensor are respectively and electrically connected with the signal input end of a control unit, and the control unit is respectively and electrically connected with the control input end of a motor of the water supply pump and the control input end of a motor of the water return pump; the first gas-liquid separator and the second gas-liquid separator are respectively provided with a first liquid level sensor and a second gas-liquid level sensor, the first liquid level sensor and the second gas-liquid level sensor are respectively electrically connected with the control unit, and the control unit is respectively electrically connected with the motor of the first oil delivery pump and the control input end of the motor of the second oil delivery pump.

The air release pipeline is connected with an electromagnetic valve in series, a pressure sensor is arranged on the hydrogen sulfide gas pipeline between the air release pipeline and the air outlet end of the second gas-liquid separator, the pressure sensor is electrically connected with the control unit, and the control unit is electrically connected with the electromagnetic valve.

The liquid inlet end of the first gas-liquid separator is communicated with a single-well liquid inlet pipeline; the lower part of the oil storage tank is communicated with an oil outlet pipeline, a third oil transfer pump is connected in series on the oil outlet pipeline, and the top of the oil storage tank is provided with a breather valve.

And a third liquid level sensor is arranged on the oil storage tank, the third liquid level sensor is electrically connected with the control unit, and the control unit is electrically connected with the control input end of a motor of the third oil transfer pump.

The invention adopts the water cooling mode to replace the existing air cooling mode, toxic gases such as hydrogen sulfide gas and the like obtained after cooling are converged into the fuel gas of the gas boiler by the ejector, and the combustion of the gas boiler cannot be influenced because the fuel gas demand of the gas boiler is huge in proportion to the hydrogen sulfide gas generated by cooling; the natural gas which can not be liquefied and trace hydrogen sulfide enter a gas boiler to participate in combustion, so that energy waste is saved and environmental pollution is prevented; in addition, the hydrogen sulfide gas is converged into the fuel gas of the gas-fired boiler by adopting the ejector, and an additional hydrogen sulfide gas alkali liquor neutralization device is not needed; toxic and inflammable gases are less after heat exchange, temperature reduction and liquefaction, a special gas collecting device is built, the construction investment is huge, and the effect is very little; the device does not need the construction of a gas collecting device, achieves the aim of removing sulfur and simultaneously utilizes heat energy for the second time; and the field process is automatically operated by combining an automatic control technology, so that the aim of unattended operation is fulfilled.

Drawings

FIG. 1 is a schematic flow chart of example 2 of the present invention.

The codes in the figures are respectively: the gas-liquid separator comprises a first gas-liquid separator, a second gas-liquid separator, a water-cooling heat exchanger, an ejector, a heater, a gas boiler, an oil storage tank, a hydrogen sulfide gas pipeline, a first liquid inlet pipeline, a second liquid inlet pipeline, a breather valve, a water supply pipeline, a water return pipeline, a water supply pump, a water return pump, a first oil transfer pump, a second oil transfer pump, a single-well liquid inlet pipeline, an oil outlet pipeline, a third oil transfer pump, a water discharge pipeline, an air discharge pipeline, an electromagnetic valve, a gas inlet end of the ejector, a gas outlet pipeline, a gas inlet end of the gas-liquid separator, a gas outlet pipeline, a gas inlet end of the ejector.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the position relations of front, back, upper, lower, left, right and the like are determined according to the layout direction of the attached figure 1 of the specification, and corresponding valves can be arranged on all pipelines according to actual requirements.

The invention is further described with reference to the following examples and figures: