CN111154524B - Low-gas-content oil well sulfur-containing associated gas interval type in-situ purification treatment method - Google Patents
Low-gas-content oil well sulfur-containing associated gas interval type in-situ purification treatment method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
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- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
Abstract
The invention provides a low-gas-content oil well sulfur-containing associated gas interval type in-situ purification treatment method, which at least comprises the following steps: energy storage and pressure stabilization, near-high pressure balance, rotary disc atomization, static turbulence, trapping desulfurization, refrigerant liquid removal, drying and filtering. The intermittent desulfurization and purification treatment process for the associated gas of the low-gas-content oil well of the oil field is suitable for in-situ treatment of the associated gas of the low-sulfur crude oil, solves the problems of high difficulty in centralized collection of the associated gas containing sulfur and atmospheric pollution easily caused by emptying combustion, is not limited by the conditions of high gas content and continuous operation compared with the traditional natural gas desulfurization tower process, realizes purification treatment of the associated gas containing sulfur of the oil field with dispersed oil wells, low-gas-content associated gas and low-concentration hydrogen sulfide content, ensures that a gas source of a gas boiler has no hydrogen sulfide, combustion products have no harm and an air supply pipeline has no condensate, and realizes resource utilization of the associated gas containing sulfur while preventing hydrogen sulfide poisoning.
Description
Technical Field
The invention relates to the technical field of sulfur-containing associated gas purification treatment, in particular to a low-gas-content oil well sulfur-containing associated gas interval type in-situ purification treatment method.
Background
In the process of oil field development, a boiler is needed to heat oil, gas and water three phases in each link from an oil production well, a pressurization point, an oil transfer station, a dehydration station, a combination station to an oil transportation station and the like, so as to meet the process requirements of crude oil processing, gathering and transportation and the like. The production area of the oil field is distributed dispersedly, the working environment is remote and severe, the municipal heating pipe network is difficult to cover, and in order to meet the requirements of crude oil production heating and staff life heating, a large amount of coal-fired, oil-fired and gas-fired boilers are used in the production field.
Associated gas after crude oil three-phase separation treatment is used as clean energy and is a main fuel source of an oil field gas boiler. However, when associated gas with low sulfur content is blocked and leaked by a condensate of an ignition furnace or a pipeline, hydrogen sulfide is easy to cause poisoning of workers. Meanwhile, as the oil field stations are dispersed, the associated gas quantity is small and is not easy to collect, the production field usually adopts an emptying combustion mode to treat the sulfur-containing associated gas, so that not only is the atmosphere pollution generated and the resource waste of the associated gas in the field caused, but also the external gas supply system matched with the sulfur-containing block is constructed, so that the production cost is increased. Coal-fired and oil-fired boilers are gradually eliminated in the process of oil field clean production construction, and the gas-fired boilers are widely popularized and applied to make the supply of crude oil associated gas be short, so that how to reasonably and scientifically solve the problem of in-situ purification treatment of oil field low-sulfur associated gas is urgent to be!
The hydrogen sulfide removal technology commonly used at home and abroad is mainly used for purifying natural gas containing sulfur in a gas field, and both wet desulfurization and dry desulfurization require large gas amount of natural gas, can meet the continuous working requirement of a desulfurizing tower, and finally converts hydrogen sulfide into elemental sulfur for recovery. The traditional desulfurizing tower treatment process flow is complex, the investment is large, the gas amount of associated gas of an oil field with low sulfur content is small, the performance-price ratio of centralized collection is not high, the concentration of hydrogen sulfide is low and is between 50ppm and 1000ppm, the continuous working requirement of the desulfurizing tower is difficult to meet, and the elemental sulfur of a desulfurization product is easy to deposit and has spontaneous combustion risk. Therefore, an in-situ purification treatment process suitable for the oil field associated gas with small gas quantity and low sulfur content is required to be found, the gas supply pressure of a gas boiler is relieved, and in-situ resource utilization is realized.
At present, the technical problem of the direct supply gas boiler of the sulfur-containing associated gas in the oil field is five: firstly, the crude oil associated gas contains low-concentration hydrogen sulfide which is easy to cause poisoning of collection and transportation station workers; secondly, the associated gas containing sulfur is directly combusted, condensate is easy to cause pipeline blockage, and the product sulfur dioxide is easy to cause atmospheric environmental pollution; thirdly, the crude oil well site and the sites are dispersed, the unorganized discharge points are more in the gathering and transportation process, and the centralized desulfurization treatment of the sulfur-containing associated gas is difficult; fourthly, the associated gas quantity of the oil field is small, the hydrogen sulfide content is low, the continuity working requirement of the traditional natural gas desulfurization tower treatment process is difficult to meet, the spontaneous combustion risk exists in sulfur deposition, and the construction cost is high; fifthly, coal-fired and oil-fired boilers are gradually eliminated in the process of oil field clean production and construction, a large amount of popularization and application of the gas-fired boilers make supply of crude oil associated gas be in short supply, and a large amount of resources are wasted due to the traditional emptying combustion mode of the sulfur-containing associated gas.
Disclosure of Invention
The invention provides a spaced type in-situ purification treatment method for sulfur-containing associated gas of a low-gas-content oil well, which aims to solve the problems that the gas quantity of the existing associated gas of the oil field is small, the content of hydrogen sulfide is low, condensate is not beneficial to combustion and the traditional process cannot meet the requirements of purification treatment, and aims at safety protection, environmental protection and resource utilization.
The technical scheme adopted by the invention is as follows:
an interval type in-situ purification treatment method for sulfur-containing associated gas of a low-gas-content oil well comprises the following specific steps:
1) energy storage and voltage stabilization:
conveying the low-sulfur associated gas to a gas storage cavity, conveying the desulfurizer to a liquid storage cavity, and arranging an elastic isolation balance layer between the two cavities; the gas storage cavity can intermittently collect low-gas-content associated gas containing sulfur, provide dynamic pressure for system action through accumulated energy storage, and stop gas supply when the gas storage pressure reaches 0.5 Mpa;
2) and (3) high-pressure balance:
when the gas storage cavity stores energy, the liquid storage cavity is filled with the desulfurizer at normal pressure and then liquid supply is stopped; when the gas storage pressure is less than 0.3Mpa, the liquid storage cavity and the gas storage cavity are in a near high pressure balance state, when the gas storage pressure is more than or equal to 0.3Mpa, the transfusion pipeline is opened, the desulfurizer is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started;
3) disc spinning atomization:
when the pressure of the infusion pipeline is more than or equal to 0.3Mpa, the atomizing nozzle is opened, the desulfurizer is atomized through the rotary disc, and the atomized liquid drops are controlled to be 100 mu m;
4) static flow disturbance:
when the atomizing nozzle is opened and the desulfurizing agent is filled in the atomizing space, the upstream gas transmission pipeline is opened, the high-pressure sulfur-containing associated gas is subjected to turbulent flow motion through static flow blocking to realize turbulent flow depressurization, and the mixed gas is transferred along the U-shaped flow guide channel through the flow guide partition plate to ensure that the upper gas inlet channel and the upper gas outlet channel are fixed;
5) and (3) catching and desulfurizing:
the collecting desulfurization unit is designed into a sleeve shape, collects the liquid inside and the gas outside the annular space, increases the collecting contact area of the atomized desulfurizer, statically blocks the sulfur-containing associated gas through an annular space atomizing cavity, increases the collecting contact frequency of the atomized desulfurizer, moves through a U-shaped flow guide channel, increases the collecting residence time of the atomized desulfurizer, increases the gas output pressure of the annular space atomizing cavity to be more than or equal to 0.25Mpa, and increases the content of hydrogen sulfide to be less than or equal to 20mg/m after treatment3The annular liquid is discharged from the bottom of the atomizing cavity;
6) refrigerant liquid removal:
a refrigerant liquid removing unit removes desulfurizer and condensate oil liquid components carried by associated gas in the atomization and trapping process, the output pressure of condensed associated gas is more than or equal to 0.2Mpa, no free water exists in the treated associated gas, and condensate liquid is discharged from the bottom of a condensation cavity;
7) drying and filtering:
a drying and filtering unit removes a small amount of water vapor and solid impurities carried by the desulfurized associated gas, the water dew point of the treated associated gas is-20 ℃, and the water content is less than or equal to 200mg/m3When the output pressure of the dried associated gas is more than or equal to 0.2Mpa, the gas can be directly supplied to a gas boiler of a crude oil gathering and transportation station for combustion.
The liquid storage cavity in the step 1) and the liquid storage cavity in the step 2) are positioned at the upper part of the gas storage cavity, and the middle parts of the liquid storage cavity and the gas storage cavity are separated by an elastic isolation balance layer; when the gas storage cavity collects the energy storage of the low-gas-content associated gas, the gas pressure is transmitted to the liquid storage cavity through the elastic isolation balance layer, the liquid storage cavity is always kept in a temporary high-pressure state, high-pressure output kinetic energy is provided for a desulfurizer pipeline, the bottom of the gas storage cavity has a liquid drainage function, the gas storage cavity is collected by the collected liquid condensate of the sulfur-containing associated gas, and the gas storage cavity is prevented from being submerged by the overhigh liquid level of the condensate.
The energy storage and voltage stabilization in the step 1) and the near high voltage balance in the step 2) are in linkage control, and the method specifically comprises the following steps:
firstly, inputting a desulfurizing agent into a liquid storage cavity by a liquid supply source, and stopping liquid supply after the input amount is equal to the initial volume of the liquid storage cavity;
secondly, the gas storage cavity starts to collect the sulfur-containing associated gas, energy is continuously stored when the pressure is less than 0.5Mpa, the temporary high-pressure kinetic energy of the liquid storage cavity is gradually increased, and gas supply to the gas storage cavity is stopped when the pressure reaches the designed bearing pressure of the elastic isolation balance layer of 0.5 Mpa;
thirdly, when the temporary high pressure of the liquid storage cavity is more than or equal to 0.3Mpa, the liquid conveying pipeline is opened, the desulfurizing agent is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started;
fourthly, stopping supplying gas to the gas storage cavity when the liquid level of the associated gas condensate containing sulfur reaches the height of 1/4 at the bottom of the gas storage cavity;
fifthly, when the pressure of the gas storage cavity is reduced to 0.3Mpa, the liquid discharging function at the bottom of the gas storage cavity is started;
and sixthly, stopping liquid drainage when the liquid level drops to the height of 1/10 at the bottom of the gas storage cavity, and restarting to supply gas to the gas storage cavity.
Step 3), step 4) and in step 5), the integration design is adopted in capstan atomizing, static vortex and entrapment desulfurization, atomizer sprays atomizing desulfurizer to the annular space, and static vortex makes atomizing desulfurizer and sulphur-containing associated gas intensive mixing, and the chelation reaction entrapment hydrogen sulfide generates the desulfurization product of dissolving in water, and the bottom flowing back is retrieved, and the desulfurization associated gas flow is to next processing unit, realizes stable atomizing, the vortex is mixed, the chelation entrapment, gas-liquid separation centralized processing.
In the step 6), the refrigerant liquid removing unit consists of a condensation cavity and a heat dissipation cavity, and the refrigerant pipe penetrates through the heat insulation sealing layer to connect the two cavities; the condensation cavity is internally provided with an S-shaped flow guide channel, and the refrigerant pipes are arranged into a pipe along the direction of the S-shaped flow guide channel; the bottom of the condensation cavity has a liquid drainage function, and is used for collecting atomized desulfurizer and condensate oil components carried by the desulfurized associated gas, so that the liquid level of the condensate liquid is prevented from submerging the diversion baffle plate to influence the airflow channel.
In the step 6), the control step of the refrigerant liquid removing unit is as follows:
step one, when the height of the condensate reaches 1/4 of the bottom of the condensation cavity, closing an upstream gas pipeline, closing a desulfurizer liquid supply source and closing an atomizing nozzle;
secondly, when the pressure of the condensation cavity is reduced to 0.2Mpa, standing for 10min, and then starting a liquid discharge function at the bottom of the condensation cavity;
and thirdly, stopping discharging liquid when the liquid level drops to the height of 1/10 at the bottom of the condensation cavity, restarting a desulfurizer liquid supply source, and starting the atomizing nozzle and the upstream gas transmission pipeline.
And 7), the drying and filtering unit consists of a drying cavity and an air collecting cavity, the two cavities are separated by a molecular sieve, the drying cavity is designed in a layered multi-air-passage mode, drying agents are filled in the air passages, a small amount of carried water vapor is removed in the process of transporting the condensed associated gas along the layered air passages, carried solid impurities are removed when the condensed associated gas passes through the molecular sieve, the condition that the boiler air supply pipeline is blocked by secondary condensation of the associated gas vapor in a low-temperature environment is prevented, and the dried and purified associated gas is directly supplied to the gas boiler after being accumulated in the air collecting cavity.
The invention has the beneficial effects that:
1. compared with the traditional natural gas desulfurization tower process, the intermittent desulfurization and purification treatment process for the associated gas of the low-gas-content oil well of the oil field is not limited by the conditions of large gas amount and continuous operation, and realizes the purification treatment of the sulfur-containing associated gas of the oil field with dispersed oil well, low-gas-content associated gas and low-concentration hydrogen sulfide content.
2. The invention provides an in-situ treatment method for associated gas of an oil field low-sulfur oil well, which is used as boiler fuel for heating in an oil field production process, living heating and the like after purification, and solves the problems of large difficulty in centralized collection of the sulfur-containing associated gas and easy atmospheric pollution caused by emptying combustion.
3. The invention has the processing functions of stable pressure collection, atomization desulfurization, condensation liquid removal, drying and filtration and the like of the low-sulfur-containing oilfield associated gas, the gas source of the gas boiler after purification treatment has no hydrogen sulfide, combustion products have no harm, and the gas supply pipeline has no condensate, thereby ensuring the safety of personnel and realizing the resource utilization of the low-sulfur-containing oilfield associated gas.
4. The invention realizes the stable collection of the low-gas oil-well associated gas, and the gas storage cavity collects the low-gas sulfur-containing associated gas energy storage through the energy storage pressure stabilization and near-high pressure balance linkage control, and simultaneously transmits the gas pressure to the liquid storage cavity through the elastic isolation balance layer, so that the liquid storage cavity is always kept in a temporary high-pressure state, and high-pressure output kinetic energy is provided for a desulfurizer pipeline.
5. The invention realizes the centralized treatment of stable atomization, turbulent flow mixing, chelating trapping and gas-liquid separation of the sulfur-containing associated gas, and the atomizing nozzle sprays the atomized desulfurizer to the annular space through the integrated design of the rotary disc atomization, the static turbulent flow and the trapping desulfurization, the static turbulent flow enables the atomized desulfurizer and the sulfur-containing associated gas to be fully mixed, and the chelating reaction traps the hydrogen sulfide to generate a desulfurization product dissolved in water.
Detailed Description
Example 1:
the invention provides a spaced type in-situ purification treatment method for sulfur-containing associated gas of a low-gas-content oil well, which aims to solve the problems that the gas quantity of the existing associated gas of the oil field is small, the content of hydrogen sulfide is low, condensate is not beneficial to combustion and the traditional process cannot meet the requirements of purification treatment, and aims at safety protection, environmental protection and resource utilization.
An interval type in-situ purification treatment method for sulfur-containing associated gas of a low-gas-content oil well comprises the following specific steps:
1) energy storage and voltage stabilization:
conveying the low-sulfur associated gas to a gas storage cavity, conveying the desulfurizer to a liquid storage cavity, and arranging an elastic isolation balance layer between the two cavities; the gas storage cavity can intermittently collect low-gas-content associated gas containing sulfur, provide dynamic pressure for system action through accumulated energy storage, and stop gas supply when the gas storage pressure reaches 0.5 Mpa;
2) and (3) high-pressure balance:
when the gas storage cavity stores energy, the liquid storage cavity is filled with the desulfurizer at normal pressure and then liquid supply is stopped; when the gas storage pressure is less than 0.3Mpa, the liquid storage cavity and the gas storage cavity are in a near high pressure balance state, when the gas storage pressure is more than or equal to 0.3Mpa, the transfusion pipeline is opened, the desulfurizer is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started;
3) disc spinning atomization:
when the pressure of the infusion pipeline is more than or equal to 0.3Mpa, the atomizing nozzle is opened, the desulfurizer is atomized through the rotary disc, and the atomized liquid drops are controlled to be 100 mu m;
4) static flow disturbance:
when the atomizing nozzle is opened and the desulfurizing agent is filled in the atomizing space, the upstream gas transmission pipeline is opened, the high-pressure sulfur-containing associated gas is subjected to turbulent flow motion through static flow blocking to realize turbulent flow depressurization, and the mixed gas is transferred along the U-shaped flow guide channel through the flow guide partition plate to ensure that the upper gas inlet channel and the upper gas outlet channel are fixed;
5) and (3) catching and desulfurizing:
the collecting desulfurization unit is designed into a sleeve shape, collects the liquid inside and the gas outside the annular space, increases the collecting contact area of the atomized desulfurizer, statically blocks the sulfur-containing associated gas through an annular space atomizing cavity, increases the collecting contact frequency of the atomized desulfurizer, moves through a U-shaped flow guide channel, increases the collecting residence time of the atomized desulfurizer, increases the gas output pressure of the annular space atomizing cavity to be more than or equal to 0.25Mpa, and increases the content of hydrogen sulfide to be less than or equal to 20mg/m after treatment3The annular liquid is discharged from the bottom of the atomizing cavity;
6) refrigerant liquid removal:
a refrigerant liquid removing unit removes desulfurizer and condensate oil liquid components carried by associated gas in the atomization and trapping process, the output pressure of condensed associated gas is more than or equal to 0.2Mpa, no free water exists in the treated associated gas, and condensate liquid is discharged from the bottom of a condensation cavity;
7) drying and filtering:
a drying and filtering unit removes a small amount of water vapor and solid impurities carried by the desulfurized associated gas, the water dew point of the treated associated gas is-20 ℃, and the water content≤200mg/m3When the output pressure of the dried associated gas is more than or equal to 0.2Mpa, the gas can be directly supplied to a gas boiler of a crude oil gathering and transportation station for combustion.
The low-sulfur associated gas is conveyed to the gas storage cavity, the desulfurizer is conveyed to the liquid storage cavity, the elastic isolation balance layer is arranged between the two cavities, and the liquid storage cavity is filled with the desulfurizer at normal pressure and then liquid supply is stopped while energy is stored in the gas storage cavity. When the gas storage pressure is less than 0.3Mpa, the liquid storage cavity and the gas storage cavity are in a near high pressure balance state, when the gas storage pressure is more than or equal to 0.3Mpa, the transfusion pipeline is opened, the desulfurizer is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started; when the pressure of the infusion pipeline is more than or equal to 0.3Mpa, the atomizing nozzle is opened, the desulfurizer is atomized through the rotary disc, and the atomized liquid drops are controlled to be 100 mu m; when the atomizing nozzle is opened and the desulfurizing agent is filled in the atomizing space, the upstream gas transmission pipeline is opened, the high-pressure sulfur-containing associated gas is subjected to turbulent flow motion through static flow resistance to realize turbulent flow pressure reduction, and the mixed gas is moved along the U-shaped flow guide channel through the flow guide partition plate to ensure that the upper gas inlet channel and the upper gas outlet channel are fixed; the gathering desulfurization unit increases the gathering contact area of the atomized desulfurizer, the sulfur-containing associated gas statically flows through the annular atomizing cavity, the gathering contact frequency of the atomized desulfurizer is increased, the sulfur-containing associated gas migrates through the U-shaped flow guide channel, the gathering residence time of the atomized desulfurizer is increased, the gas output pressure of the annular atomizing cavity is more than or equal to 0.25Mpa, and the content of hydrogen sulfide after treatment is less than or equal to 20mg/m3The annular liquid is discharged from the bottom of the atomizing cavity; the refrigerant liquid removing unit mainly removes liquid components such as desulfurizer and condensate oil carried by associated gas in the atomization and trapping process, the output pressure of condensed associated gas is more than or equal to 0.2Mpa, no free water exists in the treated associated gas, and the condensate liquid is discharged from the bottom of the condensation cavity; the drying and filtering unit is mainly used for removing a small amount of water vapor and solid impurities carried by the desulfurized associated gas, the water dew point of the treated associated gas is-20 ℃, and the water content is less than or equal to 200mg/m3When the output pressure of the dried associated gas is more than or equal to 0.2Mpa, the gas can be directly supplied to a gas boiler of a crude oil gathering and transportation station for combustion.
The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well is suitable for in-situ treatment and purification of the low-sulfur-containing crude oil associated gas, and can be used as boiler fuels for heating in an oil field production process, living heating and the like on site, so that a gas source is ensured to be free of hydrogen sulfide, an air supply pipeline is free of condensate, combustion products are harmless, the safe and stable operation of a gas boiler is ensured, and the resource utilization of the sulfur-containing associated gas of the oil field is realized. Compared with the traditional natural gas desulfurization tower process, the intermittent desulfurization and purification treatment process for the associated gas of the low-gas-content oil well of the oil field is not limited by the conditions of large gas amount and continuous operation, and realizes the purification treatment of the sulfur-containing associated gas of the oil field with dispersed oil well, low-gas-content associated gas and low-concentration hydrogen sulfide content. The invention provides an in-situ treatment method for associated gas of an oil field low-sulfur oil well, which is used as boiler fuel for heating in an oil field production process, living heating and the like after purification, and solves the problems of large difficulty in centralized collection of the sulfur-containing associated gas and easy atmospheric pollution caused by emptying combustion. The invention has the functions of stable pressure collection, atomization desulfurization, condensation liquid removal, drying and filtration of the low-sulfur oil field associated gas, and the gas source of the gas boiler after purification treatment has no hydrogen sulfide, no harm to combustion products and no condensate in an air supply pipeline, thereby ensuring the safety of personnel and realizing the resource utilization of the low-sulfur oil field associated gas. The invention realizes the stable collection of the low-gas oil-well associated gas, and the gas storage cavity collects the low-gas sulfur-containing associated gas energy storage through the energy storage pressure stabilization and near-high pressure balance linkage control, and simultaneously transmits the gas pressure to the liquid storage cavity through the elastic isolation balance layer, so that the liquid storage cavity is always kept in a temporary high-pressure state, and high-pressure output kinetic energy is provided for a desulfurizer pipeline.
The intermittent desulfurization and purification treatment process for the associated gas of the low-gas-content oil well of the oil field is suitable for in-situ treatment of the associated gas of the low-sulfur crude oil, solves the problems of high difficulty in centralized collection of the associated gas containing sulfur and atmospheric pollution easily caused by emptying combustion, is not limited by the conditions of high gas content and continuous operation compared with the traditional natural gas desulfurization tower process, realizes purification treatment of the associated gas containing sulfur of the oil field with dispersed oil wells, low-gas-content associated gas and low-concentration hydrogen sulfide content, ensures that a gas source of a gas boiler has no hydrogen sulfide, combustion products have no harm and an air supply pipeline has no condensate, and realizes resource utilization of the associated gas containing sulfur while preventing hydrogen sulfide poisoning.
Example 2:
based on the embodiment 1, in the embodiment, the liquid storage cavities in the step 1) and the step 2) are positioned at the upper part of the gas storage cavity, and the middle parts of the liquid storage cavities are separated by the elastic isolation balance layer; when the gas storage cavity collects the energy storage of the low-gas-content associated gas, the gas pressure is transmitted to the liquid storage cavity through the elastic isolation balance layer, the liquid storage cavity is always kept in a temporary high-pressure state, high-pressure output kinetic energy is provided for a desulfurizer pipeline, the bottom of the gas storage cavity has a liquid drainage function, the gas storage cavity is collected by the collected liquid condensate of the sulfur-containing associated gas, and the gas storage cavity is prevented from being submerged by the overhigh liquid level of the condensate.
The energy storage and voltage stabilization in the step 1) and the near high voltage balance in the step 2) are in linkage control, and the method specifically comprises the following steps:
firstly, inputting a desulfurizing agent into a liquid storage cavity by a liquid supply source, and stopping liquid supply after the input amount is equal to the initial volume of the liquid storage cavity;
secondly, the gas storage cavity starts to collect the sulfur-containing associated gas, energy is continuously stored when the pressure is less than 0.5Mpa, the temporary high-pressure kinetic energy of the liquid storage cavity is gradually increased, and gas supply to the gas storage cavity is stopped when the pressure reaches the designed bearing pressure of the elastic isolation balance layer of 0.5 Mpa;
thirdly, when the temporary high pressure of the liquid storage cavity is more than or equal to 0.3Mpa, the liquid conveying pipeline is opened, the desulfurizing agent is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started;
fourthly, stopping supplying gas to the gas storage cavity when the liquid level of the associated gas condensate containing sulfur reaches the height of 1/4 at the bottom of the gas storage cavity;
fifthly, when the pressure of the gas storage cavity is reduced to 0.3Mpa, the liquid discharging function at the bottom of the gas storage cavity is started;
and sixthly, stopping liquid drainage when the liquid level drops to the height of 1/10 at the bottom of the gas storage cavity, and restarting to supply gas to the gas storage cavity.
Step 3), step 4) and in step 5), the integration design is adopted in capstan atomizing, static vortex and entrapment desulfurization, atomizer sprays atomizing desulfurizer to the annular space, and static vortex makes atomizing desulfurizer and sulphur-containing associated gas intensive mixing, and the chelation reaction entrapment hydrogen sulfide generates the desulfurization product of dissolving in water, and the bottom flowing back is retrieved, and the desulfurization associated gas flow is to next processing unit, realizes stable atomizing, the vortex is mixed, the chelation entrapment, gas-liquid separation centralized processing.
In the step 6), the refrigerant liquid removing unit consists of a condensation cavity and a heat dissipation cavity, and the refrigerant pipe penetrates through the heat insulation sealing layer to connect the two cavities; the condensation cavity is internally provided with an S-shaped flow guide channel, and the refrigerant pipes are arranged into a pipe along the direction of the S-shaped flow guide channel; the bottom of the condensation cavity has a liquid drainage function, and is used for collecting atomized desulfurizer and condensate oil components carried by the desulfurized associated gas, so that the liquid level of the condensate liquid is prevented from submerging the diversion baffle plate to influence the airflow channel.
In the step 6), the control step of the refrigerant liquid removing unit is as follows:
step one, when the height of the condensate reaches 1/4 of the bottom of the condensation cavity, closing an upstream gas pipeline, closing a desulfurizer liquid supply source and closing an atomizing nozzle;
secondly, when the pressure of the condensation cavity is reduced to 0.2Mpa, standing for 10min, and then starting a liquid discharge function at the bottom of the condensation cavity;
and thirdly, stopping discharging liquid when the liquid level drops to the height of 1/10 at the bottom of the condensation cavity, restarting a desulfurizer liquid supply source, and starting the atomizing nozzle and the upstream gas transmission pipeline.
And 7), the drying and filtering unit consists of a drying cavity and an air collecting cavity, the two cavities are separated by a molecular sieve, the drying cavity is designed in a layered multi-air-passage mode, drying agents are filled in the air passages, a small amount of carried water vapor is removed in the process of transporting the condensed associated gas along the layered air passages, carried solid impurities are removed when the condensed associated gas passes through the molecular sieve, the condition that the boiler air supply pipeline is blocked by secondary condensation of the associated gas vapor in a low-temperature environment is prevented, and the dried and purified associated gas is directly supplied to the gas boiler after being accumulated in the air collecting cavity.
Compared with the traditional natural gas desulfurization tower process, the intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well is not limited by the conditions of large gas amount and continuous operation, and realizes the purification treatment of the sulfur-containing associated gas of the oil field with dispersed oil wells, low-gas-content associated gas and low-concentration hydrogen sulfide content.
The invention provides an in-situ treatment method for associated gas of an oil field low-sulfur oil well, which is used as boiler fuel for heating in an oil field production process, living heating and the like after purification, and solves the problems of large difficulty in centralized collection of the sulfur-containing associated gas and easy atmospheric pollution caused by emptying combustion.
The invention has the processing functions of stable pressure collection, atomization desulfurization, condensation liquid removal, drying and filtration and the like of the low-sulfur-containing oilfield associated gas, the gas source of the gas boiler after purification treatment has no hydrogen sulfide, combustion products have no harm, and the gas supply pipeline has no condensate, thereby ensuring the safety of personnel and realizing the resource utilization of the low-sulfur-containing oilfield associated gas.
The invention realizes the stable collection of the low-gas oil-well associated gas, and the gas storage cavity collects the low-gas sulfur-containing associated gas energy storage through the energy storage pressure stabilization and near-high pressure balance linkage control, and simultaneously transmits the gas pressure to the liquid storage cavity through the elastic isolation balance layer, so that the liquid storage cavity is always kept in a temporary high-pressure state, and high-pressure output kinetic energy is provided for a desulfurizer pipeline.
The invention realizes the centralized treatment of stable atomization, turbulent flow mixing, chelating trapping and gas-liquid separation of the sulfur-containing associated gas, and the atomizing nozzle sprays the atomized desulfurizer to the annular space through the integrated design of the rotary disc atomization, the static turbulent flow and the trapping desulfurization, the static turbulent flow enables the atomized desulfurizer and the sulfur-containing associated gas to be fully mixed, and the chelating reaction traps the hydrogen sulfide to generate a desulfurization product dissolved in water.
Example 3:
based on the embodiments 1 and 2, the application of the low-gas-volume oil-associated-gas interval type desulfurization and purification treatment process is carried out on ZL sulfur-containing blocks and JY sulfur-containing blocks in the embodiment. The gas-oil ratio of an oil well in a ZL block is 88-113 m3The yield per well is 1.5-2.2 t/d, and the concentration of hydrogen sulfide is not more than 500mg/m3According to the process flow and the treatment steps of the above embodiment, the indexes of the concentration and the water content of the purified hydrogen sulfide are shown in the following table.
JY block oil well gas-oil ratio 117-130 m3T, single well productionThe amount is 3.2-5.9 t/d, and the concentration of hydrogen sulfide is not more than 1000mg/m3The indexes of the concentration of hydrogen sulfide and water content after purification are shown in the following table.
The concentration of the hydrogen sulfide of the oil well associated gas after the ZL sulfur-containing block and the JY sulfur-containing block are purified is less than or equal to 20mg/m3The water content is less than or equal to 200mg/m3Meets the second class gas treatment standard, meets the technical requirements of the direct supply gas boiler,
the intermittent in-situ purification treatment process for the sulfur-containing associated gas solves the problems that the sulfur-containing associated gas is difficult to collect in a centralized mode and atmospheric pollution is easily caused by emptying combustion, and the formed intermittent desulfurization purification treatment process for the low-gas-content oil well associated gas of the oil field realizes purification treatment of the sulfur-containing associated gas of the oil field with dispersed oil wells, low-gas-content associated gas and low-concentration hydrogen sulfide content.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention. The device unit structure and method steps involved in the present invention are prior art, and will not be further described in the present invention.
Claims (7)
1. An interval type in-situ purification treatment method for sulfur-containing associated gas of a low-gas-content oil well is characterized by comprising the following steps of: the method comprises the following specific steps:
1) energy storage and voltage stabilization:
conveying the low-sulfur associated gas to a gas storage cavity, conveying the desulfurizer to a liquid storage cavity, and arranging an elastic isolation balance layer between the two cavities; the gas storage cavity can intermittently collect low-gas-content associated gas containing sulfur, provide dynamic pressure for system action through accumulated energy storage, and stop gas supply when the gas storage pressure reaches 0.5 Mpa;
2) and (3) high-pressure balance:
when the gas storage cavity stores energy, the liquid storage cavity is filled with the desulfurizer at normal pressure and then liquid supply is stopped; when the gas storage pressure is less than 0.3Mpa, the liquid storage cavity and the gas storage cavity are in a near high pressure balance state, when the gas storage pressure is more than or equal to 0.3Mpa, the transfusion pipeline is opened, the desulfurizer is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started;
3) disc spinning atomization:
when the pressure of the infusion pipeline is more than or equal to 0.3Mpa, the atomizing nozzle is opened, the desulfurizer is atomized through the rotary disc, and the atomized liquid drops are controlled to be 100 mu m;
4) static flow disturbance:
when the atomizing nozzle is opened and the desulfurizing agent is filled in the atomizing space, the upstream gas transmission pipeline is opened, the high-pressure sulfur-containing associated gas is subjected to turbulent flow motion through static flow blocking to realize turbulent flow depressurization, and the mixed gas is transferred along the U-shaped flow guide channel through the flow guide partition plate to ensure that the upper gas inlet channel and the upper gas outlet channel are fixed;
5) and (3) catching and desulfurizing:
the collecting desulfurization unit is designed into a sleeve shape, collects the liquid inside and the gas outside the annular space, increases the collecting contact area of the atomized desulfurizer, statically blocks the sulfur-containing associated gas through an annular space atomizing cavity, increases the collecting contact frequency of the atomized desulfurizer, moves through a U-shaped flow guide channel, increases the collecting residence time of the atomized desulfurizer, increases the gas output pressure of the annular space atomizing cavity to be more than or equal to 0.25Mpa, and increases the content of hydrogen sulfide to be less than or equal to 20mg/m after treatment3The annular liquid is discharged from the bottom of the atomizing cavity;
6) refrigerant liquid removal:
a refrigerant liquid removing unit removes desulfurizer and condensate oil liquid components carried by associated gas in the atomization and trapping process, the output pressure of condensed associated gas is more than or equal to 0.2Mpa, no free water exists in the treated associated gas, and condensate liquid is discharged from the bottom of a condensation cavity;
7) drying and filtering:
a drying and filtering unit removes a small amount of water vapor and solid impurities carried by the desulfurized associated gas, the water dew point of the treated associated gas is-20 ℃, and the water content is less than or equal to 200mg/m3When the dry associated gas output pressure is more than or equal to 0.2Mpa, the crude oil can be directly supplied to a crude oil gathering and transportation stationAnd (5) burning by using a gas boiler.
2. The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well as defined in claim 1, characterized in that: the liquid storage cavity in the step 1) and the liquid storage cavity in the step 2) are positioned at the upper part of the gas storage cavity, and the middle parts of the liquid storage cavity and the gas storage cavity are separated by an elastic isolation balance layer; when the gas storage cavity collects the energy storage of the low-gas-content associated gas, the gas pressure is transmitted to the liquid storage cavity through the elastic isolation balance layer, the liquid storage cavity is always kept in a temporary high-pressure state, high-pressure output kinetic energy is provided for a desulfurizer pipeline, the bottom of the gas storage cavity has a liquid drainage function, the gas storage cavity is collected by the collected liquid condensate of the sulfur-containing associated gas, and the gas storage cavity is prevented from being submerged by the overhigh liquid level of the condensate.
3. The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well as defined in claim 1, characterized in that: the energy storage voltage stabilization and near high voltage balance linkage control comprises the following specific steps:
firstly, inputting a desulfurizing agent into a liquid storage cavity by a liquid supply source, and stopping liquid supply after the input amount is equal to the initial volume of the liquid storage cavity;
secondly, the gas storage cavity starts to collect the sulfur-containing associated gas, energy is continuously stored when the pressure is less than 0.5Mpa, the temporary high-pressure kinetic energy of the liquid storage cavity is gradually increased, and gas supply to the gas storage cavity is stopped when the pressure reaches the designed bearing pressure of the elastic isolation balance layer of 0.5 Mpa;
thirdly, when the temporary high pressure of the liquid storage cavity is more than or equal to 0.3Mpa, the liquid conveying pipeline is opened, the desulfurizing agent is conveyed to the atomizing nozzle, and simultaneously, the liquid supply source is started;
fourthly, stopping supplying gas to the gas storage cavity when the liquid level of the associated gas condensate containing sulfur reaches the height of 1/4 at the bottom of the gas storage cavity;
fifthly, when the pressure of the gas storage cavity is reduced to 0.3Mpa, the liquid discharging function at the bottom of the gas storage cavity is started;
and sixthly, stopping liquid drainage when the liquid level drops to the height of 1/10 at the bottom of the gas storage cavity, and restarting to supply gas to the gas storage cavity.
4. The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well as defined in claim 1, characterized in that: the rotary disc atomizing, static vortex and entrapment desulfurization adopt integrated design, atomizer sprays atomizing desulfurizer to the annulus, static vortex makes atomizing desulfurizer and contain sulphur associated gas intensive mixing, chelate reaction entrapment hydrogen sulfide generates the desulfurization result of dissolving in water, the bottom flowing back is retrieved, the next processing unit of desulfurization associated air current, realize stable atomizing, vortex mixture, chelate entrapment, gas-liquid separation centralized processing.
5. The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well as defined in claim 1, characterized in that: in the step 6), the refrigerant liquid removing unit consists of a condensation cavity and a heat dissipation cavity, and the refrigerant pipe penetrates through the heat insulation sealing layer to connect the two cavities; the condensation cavity is internally provided with an S-shaped flow guide channel, and the refrigerant pipes are arranged into a pipe along the direction of the S-shaped flow guide channel; the bottom of the condensation cavity has a liquid drainage function, and is used for collecting atomized desulfurizer and condensate oil components carried by the desulfurized associated gas, so that the liquid level of the condensate liquid is prevented from submerging the diversion baffle plate to influence the airflow channel.
6. The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well as defined in claim 1, characterized in that: in the step 6), the control step of the refrigerant liquid removing unit is as follows:
step one, when the height of the condensate reaches 1/4 of the bottom of the condensation cavity, closing an upstream gas pipeline, closing a desulfurizer liquid supply source and closing an atomizing nozzle;
secondly, when the pressure of the condensation cavity is reduced to 0.2Mpa, standing for 10min, and then starting a liquid discharge function at the bottom of the condensation cavity;
and thirdly, stopping discharging liquid when the liquid level drops to the height of 1/10 at the bottom of the condensation cavity, restarting a desulfurizer liquid supply source, and starting the atomizing nozzle and the upstream gas transmission pipeline.
7. The intermittent in-situ purification treatment method for the sulfur-containing associated gas of the low-gas-content oil well as defined in claim 1, characterized in that: and 7), the drying and filtering unit consists of a drying cavity and an air collecting cavity, the two cavities are separated by a molecular sieve, the drying cavity is designed in a layered multi-air-passage mode, drying agents are filled in the air passages, a small amount of carried water vapor is removed in the process of transporting the condensed associated gas along the layered air passages, carried solid impurities are removed when the condensed associated gas passes through the molecular sieve, the condition that the boiler air supply pipeline is blocked by secondary condensation of the associated gas vapor in a low-temperature environment is prevented, and the dried and purified associated gas is directly supplied to the gas boiler after being accumulated in the air collecting cavity.
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