CN101586804A - A kind of preparation method of high-quality steam and preparation system - Google Patents
A kind of preparation method of high-quality steam and preparation system Download PDFInfo
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- CN101586804A CN101586804A CNA2009100838681A CN200910083868A CN101586804A CN 101586804 A CN101586804 A CN 101586804A CN A2009100838681 A CNA2009100838681 A CN A2009100838681A CN 200910083868 A CN200910083868 A CN 200910083868A CN 101586804 A CN101586804 A CN 101586804A
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Abstract
The present invention relates to a kind of preparation method and preparation system of high-quality steam.This method is carried out permanent energy heating according to the mass dryness fraction of pending wet steam flow being brought up to the required heat energy output rating that adds heat control heater of setting value to wet steam flow.This system comprises wet steam generator, pending steam parameter checkout gear, heater and heating control apparatus, the moist steam outlet of described wet steam generator connects the heat-absorbing medium import of described heater by the moist steam conveyance conduit, described pending steam parameter checkout gear is provided with the detecting element that is used to detect pending moist steam parameter, and described control device is controlled described heater described pending moist steam is carried out permanent energy heating.The present invention reduces energy resource consumption effectively when improving steam quality, reduce sewage quantity, mainly can be used for the preparation of high-quality steam required in the SAGD oil recovery.
Description
Technical field
The present invention relates to the oilfield exploitation technology, the preparation method and the preparation system of used high-quality steam in particularly a kind of SAGD oil recovery technique.
Background technology
Along with the many round exploitations of heavy crude heat extraction, more and more higher to the requirement of steam quality, specified steam quality＜80% of injection boiler saturated vapor can not satisfy the requirement of SAGD technology at present, therefore needs this steam to handle, and improves its mass dryness fraction.The method of at present general raising steam quality is to utilize steam-water separator that the saturated vapor of 75% steam quality is carried out secondary separation, isolates 25% brackish water, and its major defect one is to consume a large amount of energy, the 2nd, increased sewage load.
Summary of the invention
For overcoming the above-mentioned defective of prior art, the invention provides a kind of preparation method of high-quality steam, the preparation system of the high-quality steam that adopts this method also is provided, with when improving steam quality, reduce energy resource consumption, reduce sewage quantity.
The present invention realizes that the technical scheme of above-mentioned purpose is:
A kind of preparation method of high-quality steam, it carries out permanent energy heating according to the mass dryness fraction of pending wet steam flow being brought up to the required heat energy output rating that adds heat control heater of setting value to wet steam flow.
Can relate to the parameter that adds heat to pending wet steam flow and detect in real time, according to detected calculation of parameter with pending wet steam flow be heated to set mass dryness fraction required add heat.
Described pending wet steam flow relates to steam quality and the flow that the parameter that adds heat mainly comprises this wet steam flow.
Described permanent energy heating to pending moist steam can be carried out under the original high pressure of pending steam.
Described heater can comprise permanent energy heater of high pressure and the high temperature heater (HTH) that is used for to the heat supply of the permanent energy heater of high pressure, and by the heat energy output rating of the described high temperature heater (HTH) of control to the heat energy output control heater of the permanent energy heater of described high pressure, and then control is to the heat that adds of pending wet steam flow.
The permanent energy heater of described high pressure can adopt steam heat-exchanger, described high temperature heater (HTH) can adopt high-temperature steam boiler, and the described high temperature heater (HTH) of described control is the heating steam amount that the described high-temperature steam boiler of control is carried to the permanent energy heater of described high pressure under certain vapor (steam) temperature to the method for the heat energy output of the permanent energy heater of described high pressure.
The described high-temperature steam boiler of described control can be on the steam pipeline (trace) of the permanent energy heater of described high pressure delivering vapor bypass to be set at described high-temperature steam boiler in the mode of the quantity of steam of carrying to the permanent energy heater of described high pressure under certain vapor (steam) temperature, by the valve opening control reject steam flow in the control bypass, and then the steam flow of the permanent energy heater of described high pressure is sent in control.
Can also carry out mass dryness fraction to the steam after the heating and detect, and adopt this mass dryness fraction parameter that the heat energy output rating of heater is carried out FEEDBACK CONTROL, to obtain steam quality more accurately.
A kind of preparation system of high-quality steam, comprise wet steam generator, pending steam parameter checkout gear, heater and heating control apparatus, the moist steam outlet of described wet steam generator connects the heat-absorbing medium import of described heater by the moist steam conveyance conduit, described pending steam parameter checkout gear is provided with the detecting element that is used to detect pending moist steam parameter, described control device carries out computing to the pending steam parameter that described pending steam parameter checkout gear obtains, calculate with pending wet steam flow be heated to set mass dryness fraction required add heat, and add heat according to this and control described heater described pending moist steam is carried out permanent energy heating.
The detecting element of described pending steam parameter checkout gear comprises wet steam flow detecting element and dryness of wet steam detecting element.
Described heater can comprise permanent energy heater of high pressure and the high temperature heater (HTH) that is used for to the heat supply of the permanent energy heater of high pressure, the heat-absorbing medium import of the permanent energy heater of described high pressure constitutes the heat-absorbing medium import of described heater, the heat-absorbing medium outlet of the described heater of heat-absorbing medium export mixes of the permanent energy heater of described high pressure, by controlling described high temperature heater (HTH) the heat energy output rating of heater is controlled in the heat energy output of the permanent energy heater of described high pressure, and then controlled the heat that adds pending wet steam flow.
The permanent energy heater of described high pressure can adopt steam heat-exchanger, described high temperature heater (HTH) can adopt high-temperature steam boiler, the steam (vapor) outlet of described high-temperature steam boiler connects the heat release medium import of the permanent energy heater of described high pressure by the heating steam conveyance conduit, and the heating steam amount of carrying to the permanent energy heater of described high pressure by described control high temperature heater (HTH) is controlled the heat energy output rating of the permanent energy heater of described high pressure.
Described high-temperature steam boiler can be provided with bypass on the steam pipeline (trace) of the permanent energy heater of described high pressure delivering vapor, described bypass is provided with bypass valve, described bypass valve adopts electrically-controlled valve, the control circuit of this automatically controlled method connects the outlet line of described control device, controlling opening of valve or steam flow under the control of described control device.
Can also be provided with and handle back steam parameter checkout gear, the steam parameter checkout gear is provided with and is used to detect the heat medium outlet of described heater or the mass dryness fraction detecting element of the interior steam quality of outlet conduit after described the processing, described control device is inserted on described output line road of handling back steam parameter checkout gear, and the mass dryness fraction signal that the steam parameter checkout gear detects after described processing of described control device employing carries out FEEDBACK CONTROL to the heat energy output rating of described heater.
Because the present invention is according to the control that heat request adds heat that adds of the mass dryness fraction of pending moist steam being brought up to setting value, under the constant situation of pending moist steam parameter, carry out permanent energy heating, make the mass dryness fraction requirement that heat meets setting just that adds of steam, avoided unnecessary steam superheating thus, reduced equipment scaling, saved and heated required energy, simultaneously do not need to remove the saturation water in the moist steam yet, avoided the generation of saline sewage, reduced the sewage load of whole system, also avoided because of removing energy consumption and the energy loss that sewage brings.
Description of drawings
Fig. 1 is the structural representation of the preparation system of this a kind of high-quality steam.
The specific embodiment
The present invention heats the mass dryness fraction that improves steam by metastable wet steam flow being carried out permanent energy, and control adds heat in heating process, avoids occurring unnecessary steam superheating.
In heating process, the parameter that pending moist steam is related to heat rate detects, and calculate and reach the required heat energy of required mass dryness fraction, heat surely according to required heat energy, automatically calculate steam quality and bring up to and set mass dryness fraction value (for example 95%) energy needed (heating power), carry out permanent energy heating according to this heating function.
Under embodiment illustrated in fig. 1, system of the present invention mainly contains several parts such as wet steam generator (steam boiler), the permanent energy heater of high pressure, high temperature heater (HTH), mass dryness fraction detector, system controller (heating control apparatus) and constitutes.
The effect of each several part:
(1) wet steam generator: be used to provide the moist steam of certain parameter, for example flow is that 23T/H, pressure are that 18.0MPa, temperature are that 350 ℃, mass dryness fraction are 75% saturated vapor;
(2) mass dryness fraction detector: the mass dryness fraction that is used for detecting and monitoring the permanent energy heater of high pressure import and export saturated vapor, other data of collection such as flow detector also should be set in case of necessity, these mass dryness fraction data and other data are used to calculate the heat that adds to pending moist steam, and its middle outlet mass dryness fraction can be by feedback controling mode to adding heat adjustment;
(3) the permanent energy heater of high pressure: this is the heater block of system's reality, be used for providing the heat energy of permanent energy to saturated vapor, guarantee that saturated vapor reaches the mass dryness fraction of setting and not overheated, can adopt usually steam-to-steam heat exchanger or with the heat exchanger of supporting other any schematic form of high temperature heater (HTH);
(4) high temperature heater (HTH): steam boiler system normally, under the control of system controller, a certain amount of heat energy is provided for the permanent energy heater of high pressure, by controlling its heat (power), just can control the heat energy (power) of the permanent energy heater of high pressure to saturated vapor to the permanent energy heater of high pressure;
(5) system controller: be used for showing, calculate, store detected parameters, and send control instruction, guarantee the automatic adjusting of system.
Operation principle of the present invention:
High mass dryness fraction steam injection technology technology is a kind of novel steam injection technology technology, is the boiler export mass dryness fraction that about 75% the direct permanent energy of saturated vapor is heated to more than 95%, is re-introduced into the down-hole.
The saturated vapor of 75% steam quality of wet steam generator output, through the mass dryness fraction monitor monitors, monitor out real steam quality and steam flow, enter the permanent energy heater of high pressure, system controller calculates steam quality automatically and brings up to 95% energy needed, the heat energy of this result of calculation control high temperature heater (HTH) output, the heat energy of giving the permanent energy heater of high pressure is under control, the mass dryness fraction of the saturated vapor of the permanent energy heater outlet of assurance high pressure has prevented steam superheating about 95%.
In The whole control system, realized closed-loop adjustment, key parameters such as steam quality, steam flow, output heat energy all are automatic monitoring, regulate automatically, thereby have overcome the influence that the steam quality fluctuation brings, and have guaranteed the stable operation of system.
Technical indicator:
According to applicant's experiment,, adopt the present invention can realize following optimization index at the needs of SAGD production technique:
(1) steam parameter before the heating: pressure: 18.0MPa, mass dryness fraction: 75%, injection rate: 18.0t/h;
(2) heating back steam parameter: pressure: 18.0MPa, mass dryness fraction: 〉=95%, injection rate: 18.0t/h.
Major technique advantage of the present invention:
(1) permanent energy high pressure low temperature heating improves the mass dryness fraction technology, and conventional high-temperature heating is carried High mass dryness fraction becomes the permanent energy heating of low temperature, has guaranteed the stable of steam quality, has prevented the boiler mistake Heat, scale formation take place;
(2) HTHP heat transfer technology, heat transfer technology commonly used are to moist steam under the high pressure Direct heat transfer;
(3) high mass dryness fraction operation non-scaling control technology is by the control to heating-up temperature, anti-Ended the fouling that local steam flash distillation causes, guaranteed that the salt content in the saturation water is dissolved less than it Therefore degree has fundamentally solved scale problems;
(4) solve present high mass dryness fraction and annotated the problem that vapour exists, avoided a large amount of energy waves Take, improved heat energy recovery rate, avoided the generation of sewage.
Claims (10)
1. the preparation method of a high-quality steam is characterized in that according to the mass dryness fraction of pending wet steam flow being brought up to the required heat energy output rating that adds heat control heater of setting value wet steam flow being carried out permanent energy heating.
2. the preparation method of high-quality steam as claimed in claim 1, it is characterized in that pending wet steam flow is related to the parameter that adds heat to be detected in real time, according to detected calculation of parameter with pending wet steam flow be heated to set mass dryness fraction required add heat, described pending wet steam flow relates to steam quality and the flow that the parameter that adds heat mainly comprises this wet steam flow.
3. the preparation method of high-quality steam as claimed in claim 3, it is characterized in that described permanent energy heating to pending moist steam carries out under the original high pressure of pending steam, also the steam after the heating being carried out mass dryness fraction detects, and adopt this mass dryness fraction parameter that the heat energy output rating of heater is carried out FEEDBACK CONTROL, to obtain steam quality more accurately.
4. as the preparation method of claim 1,2 or 3 described high-quality steams, it is characterized in that described heater comprises permanent energy heater of high pressure and the high temperature heater (HTH) that is used for to the heat supply of the permanent energy heater of high pressure, and by the heat energy output rating of the described high temperature heater (HTH) of control to the heat energy output control heater of the permanent energy heater of described high pressure, and then control is to the heat that adds of pending wet steam flow.
5. the preparation method of high-quality steam as claimed in claim 4, it is characterized in that the permanent energy heater of described high pressure adopts steam heat-exchanger, described high temperature heater (HTH) can adopt high-temperature steam boiler, the described high temperature heater (HTH) of described control is the heating steam amount that the described high-temperature steam boiler of control is carried to the permanent energy heater of described high pressure under certain vapor (steam) temperature to the method for the heat energy output of the permanent energy heater of described high pressure, the described high-temperature steam boiler of described control is on the steam pipeline (trace) of the permanent energy heater of described high pressure delivering vapor bypass to be set at described high-temperature steam boiler in the mode of the quantity of steam of carrying to the permanent energy heater of described high pressure under certain vapor (steam) temperature, by the valve opening control reject steam flow in the control bypass, and then the steam flow of the permanent energy heater of described high pressure is sent in control.
6. the preparation system of a high-quality steam, comprise wet steam generator, pending steam parameter checkout gear, heater and heating control apparatus, the moist steam outlet of described wet steam generator connects the heat-absorbing medium import of described heater by the moist steam conveyance conduit, described pending steam parameter checkout gear is provided with the detecting element that is used to detect pending moist steam parameter, described control device carries out computing to the pending steam parameter that described pending steam parameter checkout gear obtains, calculate with pending wet steam flow be heated to set mass dryness fraction required add heat, and add heat according to this and control described heater described pending moist steam is carried out permanent energy heating.
7. the preparation method of high-quality steam as claimed in claim 6, it is characterized in that described heater comprises permanent energy heater of high pressure and the high temperature heater (HTH) that is used for to the heat supply of the permanent energy heater of high pressure, the heat-absorbing medium import of the permanent energy heater of described high pressure constitutes the heat-absorbing medium import of described heater, the heat-absorbing medium outlet of the described heater of heat-absorbing medium export mixes of the permanent energy heater of described high pressure, by controlling described high temperature heater (HTH) the heat energy output rating of heater is controlled in the heat energy output of the permanent energy heater of described high pressure, and then controlled the heat that adds pending wet steam flow.
8. the preparation method of high-quality steam as claimed in claim 7, it is characterized in that the permanent energy heater of described high pressure adopts steam heat-exchanger, described high temperature heater (HTH) adopts high-temperature steam boiler, the steam (vapor) outlet of described high-temperature steam boiler connects the heat release medium import of the permanent energy heater of described high pressure by the heating steam conveyance conduit, control the heat energy output rating of the permanent energy heater of described high pressure to the heating steam amount of the permanent energy heater conveying of described high pressure by described control high temperature heater (HTH), described high-temperature steam boiler is provided with bypass on the steam pipeline (trace) of the permanent energy heater of described high pressure delivering vapor, described bypass is provided with bypass valve, described bypass valve adopts electrically-controlled valve, the control circuit of this automatically controlled method connects the outlet line of described control device, controlling opening of valve or steam flow under the control of described control device.
9. the preparation system of high-quality steam as claimed in claim 8 is characterized in that the detecting element of described pending steam parameter checkout gear comprises wet steam flow detecting element and dryness of wet steam detecting element.
10. as the preparation system of claim 6,7,8 or 9 described high-quality steams, it is characterized in that also being provided with processing back steam parameter checkout gear, the steam parameter checkout gear is provided with and is used to detect the heat medium outlet of described heater or the mass dryness fraction detecting element of the interior steam quality of outlet conduit after described the processing, described control device is inserted on described output line road of handling back steam parameter checkout gear, and the mass dryness fraction signal that the steam parameter checkout gear detects after described processing of described control device employing carries out FEEDBACK CONTROL to the heat energy output rating of described heater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100838681A CN101586804B (en) | 2009-05-07 | 2009-05-07 | Preparing method of high-quality steam and preparing system thereof |
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| CN2009100838681A CN101586804B (en) | 2009-05-07 | 2009-05-07 | Preparing method of high-quality steam and preparing system thereof |
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| CN101586804A true CN101586804A (en) | 2009-11-25 |
| CN101586804B CN101586804B (en) | 2011-06-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530507A (en) * | 2020-04-15 | 2021-10-22 | 中国石油天然气股份有限公司 | Method for improving dryness of underground steam |
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2009
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530507A (en) * | 2020-04-15 | 2021-10-22 | 中国石油天然气股份有限公司 | Method for improving dryness of underground steam |
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Owner name: CHINA PETROLEUM +. NATURAL GAS CO., LTD. Free format text: FORMER OWNER: DRILLING TECHNOLOGY INSTITUTE OF CNPC LIAOHE OIL FIELD Effective date: 20120515 |
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Free format text: CORRECT: ADDRESS; FROM: 124010 PANJIN, LIAONING PROVINCE TO: 100007 DONGCHENG, BEIJING |
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Effective date of registration: 20120515 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: China Petroleum & Natural Gas Co., Ltd. Address before: 124010 Xinglongtai District, Liaoning, Panjin Patentee before: Drilling Technology Institute of CNPC Liaohe Oil Field |