CN104632128A - Anti-freezing and anti-blocking system for condensate gas field high pressure gas exploitation pipelines - Google Patents
Anti-freezing and anti-blocking system for condensate gas field high pressure gas exploitation pipelines Download PDFInfo
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- CN104632128A CN104632128A CN201410855572.8A CN201410855572A CN104632128A CN 104632128 A CN104632128 A CN 104632128A CN 201410855572 A CN201410855572 A CN 201410855572A CN 104632128 A CN104632128 A CN 104632128A
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Abstract
The invention discloses an anti-freezing and anti-blocking system for condensate gas field high pressure gas exploitation pipelines. The system comprises a gas well collecting tree, a horizontal type separator, a scroll type high pressure gas expander, power source junction boxes, pipeline electric tracing ribbons, an electric generator and a transformer, the horizontal type separator is communicated with the gas well collecting tree and the scroll type high pressure gas expander, an outlet pipeline and a gas transmission pipeline are provided with the power source junction boxes and the pipeline electric tracing ribbons, the scroll type high pressure gas expander is connected with the electric generator through a concentric rotating shaft, the electric generator is connected with a wire inlet end of the transformer through an output circuit, the outlet pipeline and the power source junction boxes of the gas transmission pipeline are communicated with a wire outlet end of the transformer respectively, and the power source junction boxes are electrically connected with the pipeline electric tracing ribbons and supply electric energy for the pipeline electric tracing ribbons. According to the system, the own pressure of natural gas is utilized to be transformed into heat energy, the purposes of heat preservation and antifreeze are achieved finally, and no additional heating furnace or antifreeze agents are needed, and furthermore energy is saved, and the whole system is simple in structure and obvious in effects.
Description
Technical field
The present invention relates to technical field of new energies, particularly the anti-frozen block system of a kind of gas condensate field high pressure flowline.
Background technology
General in gas condensate field gas extraction process, due to natural gas density and viscosity little, the coefficient of expansion is large, natural gas extraction out time pressure high, sometimes even up to 80MPa, and the pressure that bears of natural gas line is generally 7.5MPa, in the outer defeated process of natural gas, natural gas temperature after well head reducing pressure by regulating flow declines, and may form gas hydrates, cause pipe freezeup with the steam of association.For enable exploitation natural gas out carry out collection defeated and can not occur in pipeline freeze frozen block, just need to arrange reducing pressure by regulating flow device and antifreeze deblocking technology device (heating furnace, note alcohol process unit or tracing belt for pipeline) at well head simultaneously, making the Pressure Drop of extraction natural gas to managing below defeated pressure, managing defeated temperature simultaneously and remaining on more than hydrate-formation temperature.General in the process of well head natural gas reducing pressure by regulating flow, produce great pressure reduction before and after throttling, this pressure reduction is not all utilized, and causes the waste of the energy.And antifreeze heating furnace technology utilization is dry gas after treatment plant's purification, need to adopt pipeline reverse pumping technique, investment increases; In note alcohol technique, ethylene glycol need arrange retracting device, complex process, and can increase cost, traditional electric tracer heating system also needs externally fed, and energy consumption is high, and operating cost increases, and above-mentioned three kinds of traditional anti-freezing process all need to consume extra power, convenient not and economical.
In mature natural gas extraction technology, natural gas extraction pressure energy is not effectively utilized, and drop into prevent the generation of gas hydrates from too increasing a lot of cost.At present, utilization is carried out to natural gas extraction pressure and have two kinds: (1) is outer defeated after pressure energy is converted to electric energy by decompressor drive electrical generators; (2) decompressor generating set, heat pump and Environmental Heat Source is utilized to carry out expansion power generation and heating to well head.But, these two kinds of methods all need heating furnace to prevent expander outlet frozen block to the pipeline heating before decompressor, what heating process was selected remains external heat source, and does not heat expander outlet pipeline, and tangible one-tenth gas hydrates cause the danger of pipe freezeup.Above method, the requirement of thermal source is higher to external world, affected by environment comparatively large, does not prevent pipe freezeup comprehensively, cannot widely use.
Summary of the invention
The present invention is to solve the gathering system of natural gas of traditional approach is while utilizing and producing pressure in natural gas extraction, still need extra heater to heat collection pipeline, and expander outlet pipeline is not heated to the technical problem easily forming pipe freezeup.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the anti-frozen block system providing gas condensate field high pressure flowline, comprise gas well collection tree, horizontal separator, vortex high pressure gas expansion machine, electric source connecting box, pipeline electric-heating belt, generator and transformer, tree is communicated with horizontal separator by outlet pipe in gas well collection, the bottom of horizontal separator is provided with blow-off line, the outlet conduit that horizontal separator is arranged by its top is communicated with one end of vortex high pressure gas expansion machine, the other end of vortex high pressure gas expansion machine is provided with gas pipeline, outlet conduit and gas pipeline are provided with electric source connecting box and pipeline electric-heating belt, vortex high pressure gas expansion machine is connected with generator by concentric rotating shafts, generator is connected with transformer end of incoming cables by output circuit, the leading-out terminal of transformer is communicated with the electric source connecting box on gas pipeline with outlet conduit respectively by power line, electric source connecting box is electrically connected with pipeline electric-heating belt, and provide electric energy for pipeline electric-heating belt.
Preferably, in technique scheme, the outlet pipe between gas well collection tree and vortex high pressure gas expansion machine is provided with control valve.
Preferably, in technique scheme, blow-off line is provided with blowoff valve.
Preferably, in technique scheme, pipeline electric-heating belt adopts the form of laying to be arranged on outlet conduit and gas pipeline.
Preferably, in technique scheme, the electric energy that generator utilizes the pressure reduction of vortex high pressure gas expansion machine to produce is linked into electric source connecting box upper supply tube road electric-heating belt and uses.
The anti-frozen block system of gas condensate field provided by the invention high pressure flowline, select decompressor, generating set, the form that transformer and pipeline electric-heating belt combine, assemble a complete energy conversion system, the natural gas of extraction is through horizontal separator separating liquid impurities, enter vortex high pressure gas expansion machine subsequently, the concentric rotating shafts that the gas flow of high pressure promotes on vortex high pressure gas expansion machine rotates, thus drive electrical generators rotates, the pressure energy of natural gas is converted to electric energy by generator, the electricity that generator sends is after transformer regulation voltage, electric current is outputted to pipeline electric-heating belt, electric energy conversion is heat energy by pipeline electric-heating belt, for improving the temperature of gas in pipelines, supplement the loss along journey heat in pipeline, guarantee the temperature of pipeline, finally realize the job requirement of heat-preserving anti-freezing.The present invention does not need extra heating furnace or antifreeze medicament, further saves the energy, can not cause any pollution to environment, and whole system structure is simple, successful.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the schematic diagram of the anti-frozen block system of gas condensate field provided by the invention high pressure flowline.
Detailed description of the invention
As shown in Figure 1, the anti-frozen block system of gas condensate field provided by the invention high pressure flowline, comprise gas well collection tree 1, horizontal separator 3, vortex high pressure gas expansion machine 5, electric source connecting box 10, pipeline electric-heating belt 11, generator 6 and transformer 7, gas well collection tree 1 is communicated with horizontal separator 3 by outlet pipe 2, the bottom of horizontal separator 3 is provided with blow-off line 9, the outlet conduit 4 that horizontal separator 3 is arranged by its top is communicated with one end of vortex high pressure gas expansion machine 5, the other end of vortex high pressure gas expansion machine 5 is provided with gas pipeline 8, outlet conduit 4 and gas pipeline 8 are provided with electric source connecting box 10 and pipeline electric-heating belt 11, vortex high pressure gas expansion machine 5 is connected with generator 6 by concentric rotating shafts 51, generator 6 is connected with transformer 7 end of incoming cables by output circuit 61, the leading-out terminal of transformer 7 is communicated with the electric source connecting box 10 on gas pipeline 8 with outlet conduit 4 respectively by power line 71, electric source connecting box 10 is electrically connected with pipeline electric-heating belt 11, and provide electric energy for pipeline electric-heating belt 11.
As a kind of embodiment, the outlet pipe 2 between gas well collection tree 1 and vortex high pressure gas expansion machine 5 is provided with control valve 21.Control valve 21 be arranged so that the gas pressure entering horizontal separator is in suitable scope.
As a kind of embodiment, blow-off line 9 is provided with blowoff valve 91.The setting of blowoff valve 91, the sewage facilitated in horizontal separator 3 is discharged.As a kind of embodiment, pipeline electric-heating belt 11 adopts the form of laying to be arranged on outlet conduit 4 and gas pipeline 8.Adopt the form of laying, make pipeline electric-heating belt 11 for more abundant when outlet conduit 4 and gas pipeline 8 heat, the better effects if of the anti-frozen block obtained.
As a kind of embodiment, the electric energy that generator 6 utilizes the pressure reduction of vortex high pressure gas expansion machine 5 to produce is linked into electric source connecting box 10 upper supply tube road electric-heating belt 11 and uses.Whole system utilizes the energy of self to provide electric energy for pipeline electric-heating belt 11, does not need to add extra aid, meets the theory of energy-saving and emission-reduction, has very high practicality.
Enforcement concrete grammar is: pressure regulator valve pressure regulation transported to by the outlet conduit of natural gas through well head place through the extraction of gas well christmas tree, natural gas after pressure regulation enters horizontal separator and carries out gas-liquid separation, natural gas after separating liquid enters vortex high pressure gas expansion machine and carries out expansion step-down, the flowing of natural gas promotes concentric rotating shafts and rotates, thus drive electrical generators rotates, the pressure energy of natural gas is converted to electric energy by generator; The electricity access transformer that generator sends carries out voltage-regulation, and eventually through electric source connecting box access conduit electric-heating belt, electric energy conversion is heat energy by pipeline electric-heating belt, carries out electric tracing to two segment pipes before and after vortex high pressure gas expansion machine simultaneously.
For the natural gas of Ning Qi gas field, Sichuan gas well, in conjunction with the natural gas state parameter of above gas well, technical scheme of the present invention is described in detail.The natural gas well head flowing pressure of Gas Wells In Sichuan is 80MPa, flowing temperature 20 DEG C, its natural gas consists of: methane (93.23%), ethane (3.77%), propane (1.38%), normal butane (0.05%), iso-butane (0.06%), nitrogen (1.51%).
Wherein, the pipeline line length selected is 3km, and buried pipeline in the winter place soil moisture gets 3 DEG C.Draw after simulation test, temperature 60 C after well head natural gas pressure regulating, pressure 30MPa, the natural gas via pipeline electric-heating belt temperature after heating 65 DEG C after eliminator process, gas pressure 14MPa after decompressor, temperature 26 DEG C; Natural gas average temperature 25 DEG C in electric-heating belt pipeline, average pressure 13.8MPa, hydrate-formation temperature is 20 DEG C.Can find out, expander outlet gas pressure has been down in discharge pressure rate range, can not form frozen block.In pipeline, average temperature is 25 DEG C, higher than hydrate-formation temperature, in pipeline, also frozen block can not occur.And, the required heating power of decompressor preceding pipeline electric-heating belt heating is 65kw, after decompressor, the required heating power of pipeline electric-heating belt heating is 98kw, two parts are 163kw altogether, and the electric energy power produced by decompressor pressure reduction can reach 185kw, be enough to provide electric energy needed for pipeline electric-heating belt, therefore the present invention is practicable.
The anti-frozen block system of gas condensate field provided by the invention high pressure flowline, select decompressor, generating set, the form that transformer and pipeline electric-heating belt combine, assemble a complete energy conversion system, the natural gas of extraction is through horizontal separator separating liquid impurities, enter vortex high pressure gas expansion machine subsequently, the concentric rotating shafts that the gas flow of high pressure promotes on vortex high pressure gas expansion machine rotates, thus drive electrical generators rotates, the pressure energy of natural gas is converted to electric energy by generator, the electricity that generator sends is after transformer regulation voltage, electric current is outputted to pipeline electric-heating belt, electric energy conversion is heat energy by pipeline electric-heating belt, for improving the temperature of gas in pipelines, supplement the loss along journey heat in pipeline, guarantee the temperature of pipeline, finally realize the job requirement of heat-preserving anti-freezing.The present invention does not need extra heating furnace or antifreeze medicament, further saves the energy, can not cause any pollution to environment, and whole system structure is simple, successful.
Above-mentioned embodiment is intended to illustrate that the present invention can be professional and technical personnel in the field and realizes or use; modifying to above-mentioned embodiment will be apparent for those skilled in the art; therefore the present invention includes but be not limited to above-mentioned embodiment; any these claims or manual of meeting describes; meet and principle disclosed herein and novelty, the method for inventive features, technique, product, all fall within protection scope of the present invention.
Claims (5)
1. the anti-frozen block system of gas condensate field high pressure flowline, comprise gas well collection tree, horizontal separator and vortex high pressure gas expansion machine, described gas well collection tree is communicated with described horizontal separator by outlet pipe, the bottom of described horizontal separator is provided with blow-off line, the outlet conduit that described horizontal separator is arranged by its top is communicated with one end of described vortex high pressure gas expansion machine, the other end of described vortex high pressure gas expansion machine is provided with gas pipeline, it is characterized in that: also comprise electric source connecting box, pipeline electric-heating belt, generator and transformer, described outlet conduit and described gas pipeline are provided with described electric source connecting box and described pipeline electric-heating belt, described vortex high pressure gas expansion machine is connected with described generator by concentric rotating shafts, described generator is connected with described transformer end of incoming cables by output circuit, the leading-out terminal of described transformer is communicated with the electric source connecting box on described gas pipeline with described outlet conduit respectively by power line, described electric source connecting box is electrically connected with described pipeline electric-heating belt, and provide electric energy for described pipeline electric-heating belt.
2. the anti-frozen block system of gas condensate field according to claim 1 high pressure flowline, is characterized in that: the outlet pipe between described gas well collection tree and described vortex high pressure gas expansion machine is provided with control valve.
3. the anti-frozen block system of gas condensate field according to claim 1 high pressure flowline, is characterized in that: described blow-off line is provided with blowoff valve.
4. the anti-frozen block system of gas condensate field according to claim 1 high pressure flowline, is characterized in that: described pipeline electric-heating belt adopts the form of laying to be arranged on described outlet conduit and described gas pipeline.
5. the anti-frozen block system of gas condensate field according to claim 1 high pressure flowline, is characterized in that: the electric energy that described generator utilizes the pressure reduction of described vortex high pressure gas expansion machine to produce is linked on described electric source connecting box for described pipeline electric-heating belt.
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| CN201410855572.8A CN104632128B (en) | 2014-12-31 | 2014-12-31 | The anti-frozen block system of gas condensate field high pressure flowline |
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Cited By (9)
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| CN105178913A (en) * | 2015-08-05 | 2015-12-23 | 李宾飞 | Natural gas power generation electric heating wax removing and preventing device based on skin effect and application thereof |
| CN105863951A (en) * | 2016-04-15 | 2016-08-17 | 上海开山中夏节能科技有限公司 | Energy-saving pressure reduction vaporization system and method for high-pressure liquified natural gas |
| CN108662434A (en) * | 2018-04-24 | 2018-10-16 | 华南理工大学 | Block apparatus drops in a kind of ultrasonic wave applied to pipe network pressure energy electricity generation system |
| CN109162672A (en) * | 2018-09-28 | 2019-01-08 | 重庆溢信科技有限公司 | A kind of throttle system of natural gas wellhead pressure energy power generation |
| CN110469295A (en) * | 2019-08-06 | 2019-11-19 | 中国石油天然气股份有限公司 | A kind of gas well mouth throttling heating process units and method |
| CN110879196A (en) * | 2019-12-13 | 2020-03-13 | 西南石油大学 | Oil-water phase permeability testing method for oil-rich condensate gas reservoir |
| CN111677482A (en) * | 2020-06-17 | 2020-09-18 | 大庆市中瑞燃气有限公司 | High-corrosion high-pressure natural gas well exploitation and full recovery device and method |
| CN112554972A (en) * | 2020-11-25 | 2021-03-26 | 中国石油天然气股份有限公司 | Throttling heating system and method for high-pressure gas gathering station of natural gas well |
| CN114658389A (en) * | 2022-03-18 | 2022-06-24 | 贵州航天天马机电科技有限公司 | High-pressure natural gas wellhead depressurization power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105178913A (en) * | 2015-08-05 | 2015-12-23 | 李宾飞 | Natural gas power generation electric heating wax removing and preventing device based on skin effect and application thereof |
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| CN108662434A (en) * | 2018-04-24 | 2018-10-16 | 华南理工大学 | Block apparatus drops in a kind of ultrasonic wave applied to pipe network pressure energy electricity generation system |
| CN108662434B (en) * | 2018-04-24 | 2024-02-13 | 华南理工大学 | Ultrasonic wave blocking reducing device applied to pipe network pressure energy power generation system |
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| CN110879196A (en) * | 2019-12-13 | 2020-03-13 | 西南石油大学 | Oil-water phase permeability testing method for oil-rich condensate gas reservoir |
| CN110879196B (en) * | 2019-12-13 | 2022-02-11 | 西南石油大学 | Oil-water phase permeability testing method for oil-rich condensate gas reservoir |
| CN111677482A (en) * | 2020-06-17 | 2020-09-18 | 大庆市中瑞燃气有限公司 | High-corrosion high-pressure natural gas well exploitation and full recovery device and method |
| CN112554972A (en) * | 2020-11-25 | 2021-03-26 | 中国石油天然气股份有限公司 | Throttling heating system and method for high-pressure gas gathering station of natural gas well |
| CN114658389A (en) * | 2022-03-18 | 2022-06-24 | 贵州航天天马机电科技有限公司 | High-pressure natural gas wellhead depressurization power generation system |
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