CN109653716B - Ultra-thick oil huff and puff development block closed gathering and transportation method and device - Google Patents
Ultra-thick oil huff and puff development block closed gathering and transportation method and device Download PDFInfo
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- CN109653716B CN109653716B CN201811265462.0A CN201811265462A CN109653716B CN 109653716 B CN109653716 B CN 109653716B CN 201811265462 A CN201811265462 A CN 201811265462A CN 109653716 B CN109653716 B CN 109653716B
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- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
The invention relates to the technical field of thickened oil huff and puff development produced liquid of an oil-gas field, in particular to a closed gathering and transporting method and a device for an ultra-thickened oil huff and puff development block. The device is rational in infrastructure compact, and convenient to use is cooled off back through steam spray tower direct contact heat transfer on the one hand and is cooled off by circulation spray water air cooler circulative cooling again, with the light oil of enrichment in the system regularly retrieve, and on the other hand noncondensable gas adopts oil-free screw compressor pressure boost and freeze drying's mode to retrieve the aftertreatment, has not only reduced the emission of waste gas, waste oil, does benefit to environmental protection, has solved the problem of operating mode pressure boost when system tolerance is undulant again. The method is industrially applied in the huff and puff development block of the wind city oil field, can save energy, reduce cost and ensure stable and safe operation of a production system.
Description
Technical Field
The invention relates to the technical field of thickened oil huff and puff development produced liquid of oil and gas fields, in particular to a method and a device for airtight gathering and transportation of an ultra-thickened oil huff and puff development block.
Background
Steam stimulation is a production increasing method for exploiting thick oil by injecting a certain amount of steam into an oil well, closing the well for a period of time, and opening the well to produce after the heat energy of the steam is diffused to an oil layer. The steam huff and puff production cycle comprises several stages of steam injection, well stewing, open flow, well opening production, limit yield shut-in and the like, and indexes such as temperature, pressure, liquid production amount, viscosity, water content and the like of produced liquid in different stages are greatly different.
In the domestic heavy oil huff and puff development, a three-level distribution station open type flow of 'well head → metering station → transfer station → treatment station' is commonly adopted. Wherein connect the switching station link to be provided with open buffer tank more, can play the effect of coming liquid buffering and blowout period product liquid flash distillation cooling to guarantee the even running in flow rear end processing station. However, the high-temperature produced liquid is subjected to normal-pressure flash evaporation and separation at the top of the buffer tank of the transfer station, a certain amount of steam, associated gas and hydrogen sulfide are directly discharged to the atmosphere without tissue, and further, the oil and gas odor of an oil area and a nearby living area is obvious, and the overall requirements of safety and environmental protection are not met.
The difficulty of realizing closed gathering and transportation by the huff and puff development block is mainly embodied in the following aspects:
(1) due to the characteristics of huff and puff development, the temperature variation range of the extracted liquid in different production stages is large: in the initial stage of the well opening after the soaking, high-temperature steam which is not absorbed by the stratum can be produced along with produced liquid, so that the temperature of the produced liquid reaches more than 150 ℃ in the blowout period of the oil well, and the heat energy is difficult to balance; and as the production time continues, the formation temperature gradually decreases, the temperature of produced liquid at the end of the turn is only 40 ℃ to 50 ℃, and the risk of low-temperature pipe condensation needs to be considered. In addition, as the superheated steam is widely applied in the process of thick oil development, the temperature of the produced liquid is further increased, the steam carrying amount is increased, and the heat energy balance is more difficult.
(2) The shallow layer heavy oil reservoir has serious sand production, the huff and puff exploitation produced liquid exists in the form of multiphase flow of oil, steam, water, solid and the like, the complex multiphase flow produced liquid can cause certain impact on a gathering and transportation pipe network and supporting equipment, and the complex multiphase flow produced liquid is mainly reflected in that: the multiphase flow medium is easy to generate slug flow in the process of pipe transportation, and has obvious impact on a gathering, transportation and treatment system; the thick oil extraction liquid carries mud and sand seriously, and if the thick oil extraction liquid directly enters a rear-end flow path, the problems of abrasion of a heat exchanger, reduction of the service life of a rotary oil pump and the like can be caused.
(3) The pressure system is difficult to control after closed gathering and transportation. When the separation pressure is too high, the temperature of the separated liquid phase is increased, the stator material and the mechanical sealing performance of the rotary oil pump are affected, and the service life of the rotary oil pump is shortened. Meanwhile, the hydrogen sulfide residual quantity in the liquid phase is large under the pressure separation working condition, and corrosion and potential safety hazard to a back-end system are easily caused. In addition, system pressure fluctuation is easily caused in the switching process of the injection and production stages of huff and puff development, partial components in produced liquid are vaporized, and cavitation is generated after the produced liquid enters the oil transfer pump, so that the pump efficiency is greatly reduced.
(4) The model selection of the crude oil switching equipment after closed gathering and transportation is difficult, and the pressurization requirements are difficult to meet by several conventional pump types. The viscous temperature reaction of the thick oil is sensitive, the viscosity of the crude oil is changed violently due to temperature fluctuation, and the centrifugal pump cannot adapt to the crude oil transferring requirement under the working condition of low temperature and high viscosity. The stator and the rotor of the single-screw pump are made of rubber materials, and the materials are easy to age when working at the working condition of 100 ℃ for a long time, so that the service lives of the stator and the rotor are seriously reduced. Although the twin-screw pump can adapt to the influence of temperature and viscosity change, the adaptability to sand is very poor, and faults such as pump clamping, motor damage and the like are easily caused when the twin-screw pump is applied to a working condition with too high sand.
(5) The standard-reaching treatment of associated gas is difficult. The heavy oil thermal recovery temperature is high, the C-S bond in the crude oil is easy to break, the content of hydrogen sulfide, carbon dioxide and light hydrocarbon in associated gas is far beyond the content of the conventional cold recovery development mode, the complex components and saturated water have serious interference on the desulfurization process, and the complex associated gas is difficult to discharge and recycle after reaching the standard.
With the promulgation and implementation of two laws, the safety and environmental protection situation is increasingly severe, and the open gathering and transportation process commonly adopted by the huff and puff development can well meet the production requirements, but can not meet the requirements of safety and environmental protection. The sealed gathering and transportation process method for the shallow ultra-thick oil huff-puff development block is urgently needed to be developed, the problem of unorganized emission of steam and associated gas is solved, and the yield of an oil well and the stable operation of a rear-end crude oil processing station are not influenced.
Disclosure of Invention
The invention provides a closed gathering and transporting method and device for an ultra-thick oil huff and puff development block, overcomes the defects of the prior art, and can effectively solve the problems of unstable system, large loss of light hydrocarbon components and steam, resource waste, environmental pollution and high production cost in the conventional open gathering and transporting process of the existing ultra-thick oil huff and puff development block.
One of the technical schemes of the invention is realized by the following measures: a super heavy oil huff and puff development block closed gathering and transporting method is characterized by comprising the following steps: firstly, after the oil collecting area carries gas produced liquid to enter a metering manifold station through an oil extraction wellhead, the oil collecting area is automatically subjected to well selection and metering and liquid rate balancing through the metering manifold station, and then the oil collecting area is conveyed to an ultra-heavy oil steam processor, and the oil collecting area is subjected to steam-liquid separation through the ultra-heavy oil steam processor; secondly, discharging a liquid phase separated by the super heavy oil steam processor after being lifted and pressurized by an oil transfer pump, and feeding a gas phase separated by the super heavy oil steam processor and having the temperature of 95-105 ℃ into the lower part of a steam spray tower; thirdly, the saturated steam in the gas phase is reversely contacted with the top circulating spray water at 55-60 ℃ from top to bottom at the top of the steam spray tower from bottom to top, the oily sewage obtained by cooling the top circulating spray water is discharged from the bottom of the steam spray tower, the oily sewage is lifted by a circulating spray water pump and then enters an oil-water separator for oil removal to obtain condensed water at 80-90 ℃, the condensed water is cooled to 55-60 ℃ by a circulating spray water air cooler and then returns to the steam spray tower for recycling as the top circulating spray water, light hydrocarbon components in the oil-water separator are enriched and recovered at the top and then discharged, and the steam condensed water is recovered and then collected; and fourthly, sequentially sending the non-condensable gas in the gas phase discharged from the top of the steam spray tower to a screw compressor for pressurization, separation by a compressor outlet separator, drying by a freeze dryer and then sending to an associated gas treatment station, cooling the water separated by the compressor outlet separator by a compressor outlet air cooler and then circularly conveying to the screw compressor for recycling as working water.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the pressure of the super-thick oil steam processor is-3 kPa to 3kPa, the pressure of a gas phase discharged from the top of the steam spray tower is-17 kPa to-23 kPa, and the temperature of oily sewage discharged from the bottom of the steam spray tower is 98 ℃ to 102 ℃.
The liquid level of the super heavy oil steam processor and the frequency conversion of the oil transfer pump are provided with interlocking alarm; or/and a second electric regulating valve is fixedly arranged on a pipeline fixedly communicated with the oil outlet end of the oil-water separator, and the liquid level of the steam spray tower and the opening degree of the second electric regulating valve are provided with interlocking alarm; or/and the inlet pressure of the compressor and the frequency conversion of the compressor are provided with interlocking alarm; and/or a third electric regulating valve is arranged on a pipeline between the circulating spray water air cooler and the liquid inlet end of the steam spray tower, and the temperature of the steam spray tower and the opening degree of the third electric regulating valve are provided with interlocking alarm.
The super heavy oil steam processor is provided with a high liquid level discharge control loop; or/and a steam overload control loop is arranged at the temperature of a gas phase outlet at the top of the steam spraying tower; or/and the screw compressor is provided with an overtemperature protection control loop.
The second technical scheme of the invention is realized by the following measures: a device of a sealed gathering and transportation method of an ultra-thick oil huff and puff development block comprises an oil extraction well head, a metering manifold station, an ultra-thick oil steam processor, a steam spray tower, an oil-water separator and a circulating spray water air cooler, wherein the oil extraction well head is fixedly communicated with the metering manifold station through an eighth pipeline, the metering manifold station is fixedly communicated with an oil inlet end of the ultra-thick oil steam processor through a twelfth pipeline, an air outlet end is arranged at the upper part of the ultra-thick oil steam processor, an oil outlet end is arranged at the lower part of the ultra-thick oil steam processor, the air outlet end of the ultra-thick oil steam processor and the air inlet end of the steam spray tower are fixedly arranged together through a first pipeline, a second pipeline is fixedly arranged at the air outlet end of the steam spray tower, a third pipeline is fixedly arranged at the oil outlet end of the steam spray tower and the feed inlet end of the oil-water separator, a fourth pipeline is fixedly arranged at the water inlet end of the oil-water separator and the feed inlet end of the steam spray tower, and a circulating spray water air cooler is fixedly installed on the fourth pipeline, and a fifth pipeline is fixedly installed at the liquid outlet end of the super-thick oil steam processor.
The following is further optimization or/and improvement of the second technical scheme of the invention:
and a sixth pipeline is fixedly communicated with the fifth pipeline, a seventh pipeline is fixedly communicated between the sixth pipeline and the first pipeline, a first electric switch valve is fixedly installed on the sixth pipeline between the fifth pipeline and the seventh pipeline, a first electric regulating valve is fixedly installed on the seventh pipeline, and a third electric regulating valve is fixedly installed on a fourth pipeline between the circulating spray water air cooler and the liquid inlet end of the steam spray tower.
The closed gathering and transportation device for the ultra-thick oil huff and puff development block further comprises a screw compressor, a compressor outlet separator and a freezing type dryer, wherein an air inlet end of the screw compressor is fixedly communicated with a second pipeline, an air outlet end of the screw compressor is communicated with an air inlet end of the compressor outlet separator through a pipeline fixed phase, an air outlet end of the compressor outlet separator is communicated with an air inlet end of the freezing type dryer through a pipeline fixed phase, a ninth pipeline is fixedly communicated between an liquid outlet end of the bottom of the compressor outlet separator and an air inlet end of the screw compressor, a compressor outlet air cooler is fixedly installed on the ninth pipeline, a vent pipeline is fixedly communicated with the second pipeline, and a second electric switch valve is fixedly installed on the vent pipeline.
The screw compressor is an oil-free screw compressor, and the flow regulation range of the oil-free screw compressor is 10-100%.
The oil-water separator is characterized in that an oil outlet end and an oil outlet end are sequentially arranged at the top of the oil-water separator, a tenth pipeline is fixedly mounted at the oil outlet end of the oil-water separator, an inlet end of the tenth pipeline extends into the bottom of the oil-water separator and is communicated with the oil-water separator, a communicating pipeline is communicated between the tenth pipeline and the eleventh pipeline, a second electric regulating valve is fixedly mounted on the tenth pipeline, a first hand valve is fixedly mounted between the oil outlet end of the oil-water separator and the inlet end of the communicating pipeline, a second hand valve is mounted on the communicating pipeline, a third hand valve is fixedly mounted on the pipeline between the outlet end of the communicating pipeline and the oil-water outlet end of the oil-water separator, and a fourth hand valve is fixedly mounted on the eleventh pipeline.
And the fifth pipeline is fixedly provided with an oil transfer pump, and the third pipeline is fixedly provided with a circulating spray water pump.
The device is rational in infrastructure compact, and convenient to use is cooled off back through steam spray tower direct contact heat transfer on the one hand and is cooled off by circulation spray water air cooler circulative cooling again, with the light oil of enrichment in the system regularly retrieve, and on the other hand noncondensable gas adopts oil-free screw compressor pressure boost and freeze drying's mode to retrieve the aftertreatment, has not only reduced the emission of waste gas, waste oil, does benefit to environmental protection, has solved the problem of operating mode pressure boost when system tolerance is undulant again. The method is industrially applied in the huff and puff development block of the wind city oil field, can save energy, reduce cost and ensure stable and safe operation of a production system.
Drawings
FIG. 1 is a schematic diagram of a process flow structure of the apparatus according to embodiment 4 of the present invention.
The codes in fig. 1 are respectively: 1 is an ultra-thick oil steam processor, 2 is a transfer pump, 3 is a steam spray tower, 4 is a circulating spray water pump, 5 is an oil-water separator, 6 is a circulating spray water air cooler, 7 is a screw compressor, 8 is a compressor outlet separator, 9 is a compressor outlet air cooler, 10 is a freeze dryer, 11 is a first electric control valve, 12 is a first electric switch valve, 13 is a second electric control valve, 14 is a third electric control valve, 15 is a second electric switch valve, 16 is a first pipeline, 17 is a second pipeline, 18 is a third pipeline, 19 is a fourth pipeline, 20 is a fifth pipeline, 21 is a sixth pipeline, 22 is a seventh pipeline, 23 is an eighth pipeline, 24 is a ninth pipeline, 25 is a tenth pipeline, 26 is a communication pipeline, 27 is an oil production wellhead, 28 is a metering manifold station, 29 is a blow-down pipeline, 30 is an eleventh pipeline, 31 is a first hand valve, 32 is a second hand valve, 33 is the third hand valve, 34 is the fourth hand valve, 35 is the twelfth line.
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 positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described with reference to the following examples and figures:
example 1: the super heavy oil huff and puff development block closed gathering and transporting method is carried out according to the following steps: firstly, after the oil collecting area carries gas produced liquid to enter a metering manifold station 28 through an oil extraction wellhead 27, the oil collecting area is automatically subjected to well selection metering and liquid rate balancing through the metering manifold station 28, then the oil collecting area is conveyed to an ultra-heavy oil steam processor 1, and gas-liquid separation is carried out through the ultra-heavy oil steam processor 1; secondly, the liquid phase separated from the super heavy oil steam processor 1 is discharged after being lifted and pressurized by an oil transfer pump 2, and the gas phase at 95-105 ℃ separated from the super heavy oil steam processor 1 enters the lower part of a steam spray tower 3; thirdly, the saturated steam in the gas phase is reversely contacted with the top circulating spray water of 55-60 ℃ from top to bottom at the top of the steam spray tower 3 from bottom to top, the oily sewage obtained by cooling the top circulating spray water is discharged from the bottom of the steam spray tower 3, the oily sewage is lifted by a circulating spray water pump 4 and then enters an oil-water separator 5 for oil removal to obtain condensed water of 80-90 ℃, the condensed water is cooled to 55-60 ℃ by a circulating spray water air cooler 6 and then returns to the steam spray tower 3 to be recycled as the top circulating spray water, the light hydrocarbon components in the oil-water separator 5 are enriched and recovered at the top and then discharged, and the steam condensed water is recovered and then collected; and fourthly, sequentially sending the non-condensable gas in the gas phase discharged from the top of the steam spray tower 3 to a screw compressor 7 for pressurization, separation by a compressor outlet separator 8, drying by a freezing dryer 10, and then sending to an associated gas treatment station, wherein the water separated by the compressor outlet separator 8 is cooled by a compressor outlet air cooler 9 and then is circularly conveyed to the screw compressor 7 to be recycled as working water.
The invention relates to a super heavy oil huff and puff development block closed gathering and transportation method, which adopts a pump type circulating cooling system, and gas phase with the temperature of 95-105 ℃ after gas-liquid separation of a super heavy oil steam processor 1 is in reverse direct contact condensation with tower top circulating spray water with the temperature of 55-60 ℃ in a spray tower 3 through a circulating spray water air cooler 6. The steam and the light oil in the gas phase are condensed into oily sewage, the oily sewage is deoiled by an oil-water separator 55 to obtain condensed water at the temperature of 80-90 ℃, and the condensed water is cooled by a circulating spray water air cooler 6 to the temperature of 55-60 ℃ and then is used as the tower top circulating spray water of the spray tower 3 for recycling; the light oil and the steam condensate in the oily sewage are respectively recovered and collected by independent pipelines, so that the problem of heat exchange efficiency reduction caused by the enrichment of the light oil in a circulating system can be effectively solved, and the steam condensate and the light oil can be recycled to generate economic benefit. Meanwhile, the one-pump type circulating cooling system is adopted, compared with a conventional air cooling system, the wave-resistant capacity of the system can be greatly improved, the impact of the throughput development produced liquid quantity, steam quantity and temperature change on the system can be better responded, and the stability of the pressure and temperature of the whole system is further ensured.
By the ultra-thick oil huff and puff development block closed gathering and transporting method, an oil area (no more than 30km 2) with smaller scale can jointly build a closed transfer station and a crude oil processing station, and a secondary station distribution closed gathering and transporting process of 'wellhead → metering manifold station → crude oil processing station' is realized. After the invention is operated, the concentration of hydrogen sulfide and non-methane total hydrocarbon in the surrounding environment of the oil area (450 well groups) is obviously reduced, the air quality is obviously improved, the steam emission is reduced by 700t/d, the non-methane total hydrocarbon emission is reduced by 4t/d, the hydrogen sulfide emission is reduced by 120kg/d, the steam condensate water is recovered by 700t/d, the light hydrocarbon is recovered by 3.5t/d, and the oil gas and odor conditions in the oil area are obviously improved.
Example 2: the super heavy oil huff and puff development block closed gathering and transporting method is carried out according to the following steps: firstly, after the oil collecting area carries gas produced liquid to enter a metering manifold station 28 through an oil extraction wellhead 27, the oil collecting area is automatically subjected to well selection metering and liquid rate balancing through the metering manifold station 28, then the oil collecting area is conveyed to an ultra-heavy oil steam processor 1, and gas-liquid separation is carried out through the ultra-heavy oil steam processor 1; secondly, the liquid phase separated from the super heavy oil steam processor 1 is discharged after being lifted and pressurized by an oil transfer pump 2, and the gas phase at 95 ℃ or 105 ℃ separated from the super heavy oil steam processor 1 enters the lower part of a steam spray tower 3; thirdly, the saturated steam in the gas phase reversely contacts with the top circulating spray water at 55 ℃ or 60 ℃ from top to bottom at the top of the steam spray tower 3 from bottom to top, the oily sewage obtained by cooling through the top circulating spray water is discharged from the bottom of the steam spray tower 3, the oily sewage is lifted by a circulating spray water pump 4 and then enters an oil-water separator 5 to be deoiled to obtain condensate water at 80 ℃ or 90 ℃, the condensate water is cooled to 55 ℃ or 60 ℃ through a circulating spray water air cooler 6 and then returns to the steam spray tower 3 to be recycled as the top circulating spray water, the light hydrocarbon components in the oil-water separator 5 are enriched and recovered at the top and then discharged, and the steam condensate water is recovered and then collected; and fourthly, sequentially sending the non-condensable gas in the gas phase discharged from the top of the steam spray tower 3 to a screw compressor 7 for pressurization, separation by a compressor outlet separator 8, drying by a freezing dryer 10, and then sending to an associated gas treatment station, wherein the water separated by the compressor outlet separator 8 is cooled by a compressor outlet air cooler 9 and then is circularly conveyed to the screw compressor 7 to be recycled as working water.
Example 3: as optimization of the above embodiment, the pressure of the super heavy oil steam processor 1 is-3 kPa to 3kPa, the pressure of the gas phase discharged from the top of the steam spray tower 3 is-17 kPa to-23 kPa, and the temperature of the oily sewage discharged from the bottom of the steam spray tower 3 is 98 ℃ to 102 ℃.
Example 4: as the optimization of the embodiment, the liquid level of the super heavy oil steam processor and the frequency conversion of the oil transfer pump 2 are provided with interlocking alarm; or/and a second electric regulating valve is fixedly arranged on a pipeline fixedly communicated with the oil outlet end of the oil-water separator 5, and the liquid level of the steam spray tower 3 and the opening degree of the second electric regulating valve are provided with interlocking alarm; or/and the inlet pressure of the compressor and the frequency conversion of the compressor are provided with interlocking alarm; or/and a third electric regulating valve is arranged on a pipeline between the circulating spray water air cooler 6 and the liquid inlet end of the steam spray tower 3, and the temperature of the steam spray tower 3 and the opening degree of the third electric regulating valve are provided with interlocking alarm.
The ultra-thick oil steam processor 1 is provided with liquid level monitoring, the liquid level of the ultra-thick oil steam processor 1 and the frequency conversion of the oil transfer pump 2 are provided with linkage alarm, so that the liquid level of the ultra-thick oil steam processor 1 can be stabilized at any time and fluctuates within a control value range.
Example 5: as optimization of the above embodiment, the ultra-heavy oil steam processor is provided with a high liquid level discharge control loop; or/and a steam overload control loop is arranged at the temperature of a gas phase outlet at the top of the steam spraying tower; or/and the screw compressor is provided with an overtemperature protection control loop.
Example 6: as shown in attached figure 1, the device for implementing the ultra-thick oil huff and puff development block closed gathering and transportation method comprises an ultra-thick oil well mouth 27, a metering manifold station 28, a thick oil steam processor 1, a steam spray tower 3, an oil-water separator 5 and a circulating spray water air cooler 6, wherein an air outlet end is arranged at the upper part of the ultra-thick oil steam processor 1, the oil well mouth 27 and the metering manifold station 28 are fixedly communicated through an eighth pipeline 23, the metering manifold station 28 and the oil inlet end of the ultra-thick oil steam processor 1 are fixedly communicated through a twelfth pipeline 35, an oil outlet end is arranged at the lower part of the ultra-thick oil steam processor 1, the air outlet end of the ultra-thick oil steam processor 1 and the air inlet end of the steam spray tower 3 are fixedly arranged together through a first pipeline 16, a second pipeline 17 is fixedly arranged at the air outlet end of the steam spray tower 3, a third pipeline 18 is fixedly arranged at the oil outlet end of the steam spray tower 3 and the oil-water separator 5, a fourth pipeline 19 is fixedly communicated with the water outlet end of the oil-water separator 5 and the liquid inlet end of the steam spray tower 3, a circulating spray water air cooler 6 is fixedly installed on the fourth pipeline 19, and a fifth pipeline 20 is fixedly installed at the liquid outlet end of the ultra-thick oil steam processor 1.
According to the requirement, the oil production wellhead 27 in the device adopts the existing well-known underground oil jacket communication process, and by implementing the underground oil jacket communication process, the casing gas is prevented from being directly discharged to the atmosphere, and the safety and environmental protection problems of the oil production wellhead 27 are solved. The metering manifold station 28 adopts the combination of the prior known multi-way valve and a thick oil metering device to realize automatic well selection and metering. A liquid holdup equalizer is arranged at an outbound manifold of the metering manifold station 28 to ensure the stable operation of the gathering and transportation pipeline and avoid the generation of slug flow.
The device described in the above embodiment 4 can be further optimized or/and improved according to actual needs:
as shown in fig. 1, a sixth pipeline 21 is fixedly communicated with a fifth pipeline 20, a seventh pipeline 22 is fixedly communicated between the sixth pipeline 21 and the first pipeline 16, a first electric switch valve 12 is fixedly installed on the sixth pipeline 21 between the fifth pipeline 20 and the seventh pipeline 22, a first electric control valve 11 is fixedly installed on the seventh pipeline 22, and a third electric control valve 14 is fixedly installed on a fourth pipeline 19 between the circulating spray water air cooler 6 and the liquid inlet end of the steam spray tower 3.
According to the requirement, a steam overload control loop is arranged at the temperature of a gas phase outlet at the top of the steam spray tower 3, when the temperature of the gas phase outlet of the steam spray tower 3 exceeds 85 ℃, the steam overload control loop immediately opens a dynamic adjusting valve 11 which is arranged on a seventh pipeline 22 of a vapor phase outlet bypass blowdown tank of the ultra-heavy oil steam processor 1, redundant steam is diffused, and the stable operation of a steam cooling system is ensured.
As shown in fig. 1, the device of the ultra-thick oil huff and puff development block closed gathering and transferring method according to the above embodiment further includes a screw compressor 7, a compressor outlet separator 8 and a freeze dryer 10, an air inlet end of the screw compressor 7 is communicated with the second pipeline 17, an air outlet end of the screw compressor 7 is fixedly communicated with an air inlet end of the compressor outlet separator 8 through a pipeline, an air outlet end of the compressor outlet separator 8 is fixedly communicated with an air inlet end of the freeze dryer 10 through a pipeline, a ninth pipeline 24 is fixedly communicated between an liquid outlet end at the bottom of the compressor outlet separator 8 and an air inlet end of the screw compressor 7, a compressor outlet air cooler 9 is fixedly installed on the ninth pipeline 24, a blow-down pipeline 29 is fixedly communicated with the second pipeline 17, and a second electric switch valve 15 is fixedly installed on the blow-down pipeline 29.
According to the requirement, the screw compressor 7 is provided with an overtemperature protection control circuit, when the temperature of the gas phase outlet of the steam spray tower 3 exceeds 65 ℃, the overtemperature protection control circuit of the screw compressor 7 immediately opens the second electric switch valve 15 on the emptying pipeline 29, associated gas is emergently emptied, the gas phase temperature in the steam spray tower 3 is reduced, and the stable operation of the steam cooling system is ensured.
As shown in the attached figure 1, in the device of the ultra-thick oil huff and puff development block closed gathering and transportation method of the embodiment, the screw compressor 7 is an oil-free screw compressor, and the flow regulation range of the oil-free screw compressor is 10 to 100 percent
According to the requirement, after the non-condensable gas discharged by the steam spray tower 3 is pressurized by the oil-free screw compressor 7, the flow regulation range is 10-100%, and the characteristic of large fluctuation of associated gas quantity in oilfield huff and puff development is adapted. Compared with the traditional screw compressor with oil, the compressor can effectively avoid the pollution of the medium such as water vapor, light hydrocarbon and the like to a lubricating oil system.
As shown in fig. 1, an oil outlet end and an oil outlet end are sequentially arranged at the top of the oil-water separator 5, a tenth pipeline 25 is fixedly installed at the oil outlet end of the oil-water separator 5, an inlet end of the tenth pipeline 25 extends into the bottom of the oil-water separator 5 and is communicated with the oil-water separator 5, a communication pipeline 26 is communicated between the tenth pipeline 25 and the eleventh pipeline 30, a second electric regulating valve 13 is fixedly installed on the tenth pipeline 25, a first hand valve 31 is fixedly installed between the oil outlet end of the oil-water separator 5 and the inlet end of the communication pipeline 26, a second hand valve 32 is installed on the communication pipeline, a third hand valve 33 is fixedly installed on the pipeline between the outlet end of the communication pipeline 26 and the oil outlet end of the oil-water separator 5, and a fourth hand valve 34 is fixedly installed on the eleventh pipeline 30.
When the light oil and the condensed water at the top of the tower are separately collected at the top of the oil-water separator 5, the second hand valve 32 is closed, and the first hand valve 31, the third hand valve 33, the fourth hand valve 34 and the second electric control valve 13 are opened, so that the light oil is discharged from the tenth pipeline 25, and the condensed water of the steam is discharged from the eleventh pipeline 30; when the oil-water mixture at the top of the oil-water separator 5 is discharged, the first hand valve 31 and the fourth hand valve 34 are closed, the second hand valve 32, the third hand valve 33, and the second electric control valve 13 are opened, and the oil-water mixture enters the tenth line 25 from the communication line 26 and is discharged. Therefore, the light oil generated in the steam condensate water circulating spraying process can be recovered, economic benefits are generated, and the problem of low system heat exchange efficiency caused by enrichment of the light oil in a circulating system can be effectively avoided.
According to the needs, the steam spray tower 3 is provided with liquid level control, and the liquid level of the steam spray tower 3 is interlocked with the opening degree of the second electric regulating valve 13, so that the liquid level of the steam spray tower 3 can be conveniently and timely adjusted within the control value range.
As shown in fig. 1, an oil transfer pump 2 is fixedly installed on the fifth pipeline 20, and a circulating spray water pump 4 is fixedly installed on the third pipeline 18.
According to needs, super viscous crude steam processor 1 is provided with high liquid level control circuit that releases, and when being because of the power failure or the 2 trouble of commentaries on classics oil pump, super viscous crude steam processor 1 liquid level was 85% to 90%, can not in time flowing back, and super viscous crude steam processor high liquid level control circuit that releases opens first electric switch valve 12 on sixth pipeline 21 immediately, in time discharges super viscous crude steam processor 1's liquid phase to the blowdown pond.
In conclusion, the enclosed gathering and transportation method for the ultra-thick oil huff and puff development block adopts a three-stage distribution station enclosed gathering and transportation flow of 'a wellhead → a metering manifold station → an enclosed transfer station → a processing station' for the first time, so that the enclosed gathering and transportation flow from the wellhead to the processing station is realized. The device for implementing the ultra-thick oil huff and puff development block closed gathering and transportation method has the advantages of reasonable and compact structure and convenient use, on one hand, the device is cooled by the direct contact type heat exchange of the steam spray tower and then is cooled by the circulating spray water air cooler in a circulating way, so that the light oil enriched in the system is recovered at regular intervals, on the other hand, the noncondensable gas is recovered by adopting the way of oil-free screw compressor pressurization and freeze drying and then is treated, thereby not only reducing the emission of waste gas and waste oil, being beneficial to environmental protection, but also solving the problem of working condition pressurization when the air quantity of the system fluctuates. The method is industrially applied in the huff and puff development block of the wind city oil field, can save energy, reduce cost and ensure stable and safe operation of a production system.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
As shown in the attached figure 1, the use method of the device in the embodiment 4 of the invention comprises the following steps: firstly, after the oil collecting area carries gas produced liquid to enter a metering manifold station 28 through an oil extraction wellhead 27 through an eighth pipeline 23, the oil collecting area is automatically subjected to well selection metering and liquid rate balancing through the metering manifold station 28, and then the oil collecting area is conveyed to an ultra-heavy oil steam processor 1 through a twelfth pipeline 35, and the oil collecting area carries out gas-liquid separation through the ultra-heavy oil steam processor 1; secondly, the liquid phase separated from the super heavy oil steam processor 1 is discharged after being lifted and pressurized by an oil transfer pump 2 on a fifth pipeline 20, and saturated steam separated from the super heavy oil steam processor 1 enters the lower part of a steam spray tower 3 through a first pipeline 16; thirdly, after the saturated steam is reversely contacted and cooled with the tower top circulating spray water from top to bottom at the top of the steam spray tower 3 from bottom to top, the oily sewage discharged from the bottom of the steam spray tower 3 is lifted by a circulating spray water pump 4 and then enters an oil-water separator 5, the deoiled condensed water is cooled by a circulating spray water air cooler 6 and then returns to the steam spray tower 3 to be used as the tower top circulating spray water for circulation, the light hydrocarbon components in the oil-water separator 5 are enriched at the top and are recovered and collected through a tenth pipeline 25, and the steam condensed water is recovered and collected through a communicating pipeline 26; fourthly, the non-condensable gas in the gas phase discharged from the top of the steam spray tower 3 is sent to a screw compressor 7 through a second pipeline 17 to be pressurized, separated by a compressor outlet separator 8, dried by a freezing dryer 10 and then sent to an associated gas treatment station, and water separated by the compressor outlet separator 8 is cooled by a compressor outlet air cooler 9 and then is recycled and conveyed to the screw compressor 7 to be recycled as working water.
Claims (6)
1. A super heavy oil huff and puff development block closed gathering and transporting method is characterized by comprising the following steps: firstly, after the oil collecting area carries gas produced liquid to enter a metering manifold station through an oil extraction wellhead, the oil collecting area is automatically subjected to well selection and metering and liquid rate balancing through the metering manifold station, and then the oil collecting area is conveyed to an ultra-heavy oil steam processor, and the oil collecting area is subjected to steam-liquid separation through the ultra-heavy oil steam processor; secondly, discharging a liquid phase separated by the super heavy oil steam processor after being lifted and pressurized by an oil transfer pump, and feeding a gas phase separated by the super heavy oil steam processor and having the temperature of 95-105 ℃ into the lower part of a steam spray tower; thirdly, the saturated steam in the gas phase is reversely contacted with the top circulating spray water at 55-60 ℃ from top to bottom at the top of the steam spray tower from bottom to top, the oily sewage obtained by cooling the top circulating spray water is discharged from the bottom of the steam spray tower, the oily sewage is lifted by a circulating spray water pump and then enters an oil-water separator for oil removal to obtain condensed water at 80-90 ℃, the condensed water is cooled to 55-60 ℃ by a circulating spray water air cooler and then returns to the steam spray tower for recycling as the top circulating spray water, light hydrocarbon components in the oil-water separator are enriched and recovered at the top and then discharged, and the steam condensed water is recovered and then collected; fourthly, the non-condensable gas in the gas phase discharged from the top of the steam spray tower is sequentially sent to a screw compressor for pressurization, separation by a compressor outlet separator and drying by a freezing dryer, and then is sent to an associated gas treatment station, the water separated by the compressor outlet separator is cooled by a compressor outlet air cooler and then is circularly conveyed to the screw compressor to be recycled as working water, wherein the pressure of the ultra-thick oil steam treatment device is-3 kPa to 3kPa, the pressure of the gas phase discharged from the top of the steam spray tower is-17 kPa to-23 kPa, the temperature of oily sewage discharged from the bottom of the steam spray tower is 98 ℃ to 102 ℃, the liquid level of the ultra-thick oil steam treatment device and the frequency conversion of a transfer pump are provided with interlocking alarm, a second electric regulating valve is fixedly installed on a pipeline fixedly communicated with the oil outlet end of the oil-water separator, and the opening degree of the second electric regulating valve are provided with interlocking alarm, the inlet pressure of the compressor and the frequency conversion of the compressor are provided with an interlocking alarm, a third electric regulating valve is installed on a pipeline between the circulating spray water air cooler and the liquid inlet end of the steam spray tower, the temperature of the steam spray tower and the opening degree of the third electric regulating valve are provided with the interlocking alarm, the ultra-thick oil steam processor is provided with a high liquid level discharge control loop, the temperature of a gas phase outlet at the top of the steam spray tower is provided with a steam overload control loop, and the screw compressor is provided with an ultra-temperature protection control loop.
2. The device for implementing the ultra-thick oil huff and puff development block closed gathering and transportation method according to claim 1 is characterized by comprising an oil extraction well head, a metering manifold station, an ultra-thick oil steam processor, a steam spray tower, an oil-water separator and a circulating spray water air cooler, wherein the oil extraction well head is fixedly communicated with the metering manifold station through an eighth pipeline, the metering manifold station is fixedly communicated with an oil inlet end of the ultra-thick oil steam processor through a twelfth pipeline, an air outlet end is arranged at the upper part of the ultra-thick oil steam processor, an oil outlet end is arranged at the lower part of the ultra-thick oil steam processor, the air outlet end of the ultra-thick oil steam processor and the air inlet end of the steam spray tower are fixedly installed together through a first pipeline, a second pipeline is fixedly installed at the air outlet end of the steam spray tower, a third pipeline is fixedly installed at the oil outlet end of the steam spray tower and the feed inlet end of the oil-water separator, the water outlet end of the oil-water separator is fixedly communicated with the liquid inlet end of the steam spray tower to form a fourth pipeline, a circulating spray water air cooler is fixedly mounted on the fourth pipeline, and a fifth pipeline is fixedly mounted at the liquid outlet end of the super-thick oil steam processor.
3. The device according to claim 2, wherein a sixth pipeline is fixedly communicated with the fifth pipeline, a seventh pipeline is fixedly communicated with the sixth pipeline and the first pipeline, a first electric switch valve is fixedly arranged on the sixth pipeline between the fifth pipeline and the seventh pipeline, a first electric regulating valve is fixedly arranged on the seventh pipeline, and a third electric regulating valve is fixedly arranged on the fourth pipeline between the circulating spray water air cooler and the liquid inlet end of the steam spray tower.
4. The device according to claim 2 or 3, further comprising a screw compressor, a compressor outlet separator and a freeze-drying machine, wherein an air inlet end of the screw compressor is fixedly communicated with the second pipeline, an air outlet end of the screw compressor is fixedly communicated with an air inlet end of the compressor outlet separator through a pipeline, an air outlet end of the compressor outlet separator is fixedly communicated with an air inlet end of the freeze-drying machine through a pipeline, a ninth pipeline is fixedly communicated between an air outlet end of the bottom of the compressor outlet separator and an air inlet end of the screw compressor, a compressor outlet air cooler is fixedly installed on the ninth pipeline, a vent pipeline is fixedly communicated with the second pipeline, and a second electric switch valve is fixedly installed on the vent pipeline.
5. The apparatus of claim 4, wherein the screw compressor is an oil-free screw compressor and the flow modulation range of the oil-free screw compressor is 10% to 100%.
6. The device according to claim 2, 3 or 5, wherein the top of the oil-water separator is sequentially provided with an oil outlet end and a liquid outlet end, the oil outlet end of the oil-water separator is fixedly provided with a tenth pipeline, the inlet end of the tenth pipeline extends into the bottom of the oil-water separator and is communicated with the oil-water separator, a communicating pipeline is communicated between the tenth pipeline and the eleventh pipeline, and a second electric regulating valve is fixedly installed on the tenth pipeline, a first hand valve is fixedly installed between the oil outlet end of the oil-water separator and the inlet end of the communicating pipeline, a second hand valve is installed on the communicating pipeline, a third hand valve is fixedly installed on the pipeline between the outlet end of the communicating pipeline and the oil outlet end of the oil-water separator, a fourth hand valve is fixedly installed on the eleventh pipeline, an oil transfer pump is fixedly installed on the fifth pipeline, and a circulating spray water pump is fixedly installed on the third pipeline.
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| CN114028913A (en) * | 2021-11-24 | 2022-02-11 | 武汉群聚焦耐科技有限责任公司 | Methanol escape gas treatment process |
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