CN119981816A - A steam system, a heavy oil SAGD production system and a superheated steam control method - Google Patents
A steam system, a heavy oil SAGD production system and a superheated steam control method Download PDFInfo
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Abstract
A steam system, a thick oil SAGD exploitation system and a superheated steam control method belong to the technical field of thick oil exploitation, the steam system comprises a first steam generation subsystem, a second steam generation subsystem, a steam injection subsystem and an operation control subsystem, the first steam generation subsystem comprises a heat absorber for collecting solar radiation energy and generating first superheated steam, the second steam generation subsystem comprises a steam injection boiler for generating second superheated steam, the steam injection subsystem comprises a steam injection well and an underground steam cavity, the steam injection well is used for injecting the superheated steam into the underground steam cavity, the underground steam cavity is used for storing and releasing the superheated steam into an oil reservoir, the operation control subsystem is used for periodically calculating a superheated steam difference value and correspondingly sending an on or off signal to the second steam generation subsystem according to the superheated steam difference value, and the superheated steam production system with low cost, stable superheated steam yield and rapid dynamic response is provided for clean and efficient exploitation of thick oil.
Description
Technical Field
The present disclosure relates to the field of heavy oil recovery, and more particularly to a steam system, a heavy oil SAGD recovery system, and a superheated steam control method.
Background
The thick oil is used as an important petroleum resource, has very high industrial application and national defense strategic value, has high viscosity in an oil layer and large flow resistance, and is difficult to develop economically and efficiently by using a conventional technology. The viscosity of the thick oil is very sensitive to temperature, and the viscosity of the thick oil can drop sharply along with the rise of the temperature. The most commonly used development mode of thickened oil at present is steam injection thermal oil recovery, which mainly comprises modes of steam huff and puff, steam flooding, steam Assisted Gravity Drainage (SAGD) and the like. In Steam Assisted Gravity Drainage (SAGD) technology, superheated steam is required to be injected into a thick oil reservoir, the oil reservoir is heated by utilizing vaporization latent heat of the superheated steam, and according to statistics, in Steam Assisted Gravity Drainage (SAGD) exploitation, the energy consumption of a superheated steam production system is more than 90% of the total energy consumption of thick oil production, in order to realize clean heat supply of thick oil production, a solar steam production system for assisting thick oil thermal recovery is available at present, and in order to overcome the defects of discontinuous and unstable solar energy, a heat storage tank system is arranged on the ground, so that heat storage is realized as much as possible when the solar irradiation intensity is high, and the thick oil reservoir is heated by utilizing the heat in the heat storage tank when the solar irradiation intensity is low or no solar radiation exists.
Disclosure of Invention
The application provides a steam system, a thick oil SAGD exploitation system and a superheated steam control method, which not only can fully utilize solar energy, but also can ensure the development and production requirements of thick oil, and has low cost, thereby providing a superheated steam production system with stable superheated steam yield and rapid dynamic response for clean and efficient exploitation of thick oil.
In one aspect, the embodiment of the application provides a steam system applied to a thick oil SAGD (steam assisted gravity drainage) exploitation system, which comprises a first steam generation subsystem, a second steam generation subsystem, a steam injection subsystem and an operation control subsystem;
The first steam generation subsystem comprises a heat absorber, wherein the heat absorber is used for collecting solar radiation energy, heating a first water working medium in the heat absorber to generate first superheated steam, and inputting the first superheated steam into the steam injection subsystem;
The second steam generation subsystem comprises a steam injection boiler, and the steam injection boiler is used for heating a second water working medium in the second steam generation subsystem to generate second superheated steam when the second steam generation subsystem is started and inputting the second superheated steam into the steam injection subsystem;
The steam injection subsystem comprises a steam injection well and an underground steam cavity, wherein the steam injection well is used for injecting the input superheated steam into the underground steam cavity, the underground steam cavity is positioned above an oil storage layer and used for storing the superheated steam and releasing the superheated steam to the oil storage layer so that the heated thickened oil in the oil storage layer is conveyed to a production well through steam driving force and gravity driving force, and the superheated steam comprises the first superheated steam and/or the second superheated steam;
The operation control subsystem is used for periodically calculating a superheated steam difference value according to the required superheated steam quantity, the superheated steam storage quantity in the underground steam cavity and the first superheated steam, and correspondingly sending an opening or closing signal to the second steam generation subsystem according to the calculated superheated steam difference value.
Optionally, the operation control subsystem is configured to periodically calculate a superheated steam difference value according to a required superheated steam amount, a superheated steam storage amount in the underground steam chamber, and the first superheated steam amount, and includes:
the operation control subsystem calculates the required superheated steam amount of the thickened oil SAGD exploitation system according to the preset thickened oil production amount of the production well;
The operation control subsystem periodically calculates an existing superheated steam amount, which is the sum of the first superheated steam amount and the superheated steam storage amount of the current period, and calculates the superheated steam difference value based on the required superheated steam amount, which is the difference value between the required superheated steam amount and the existing superheated steam amount.
Optionally, the sending, according to the calculated superheated steam difference value, an on or off signal to the second steam generation subsystem includes:
the operation control subsystem sends an opening signal to the second steam generation subsystem when the superheated steam difference value is greater than zero;
and the operation control subsystem takes the difference value of the superheated steam as the required quantity of the second superheated steam after the second steam generation subsystem is started, and correspondingly sets the power of the steam injection boiler according to the required quantity of the second superheated steam.
Optionally, the sending, according to the calculated superheated steam difference value, an on or off signal to the second steam generation subsystem correspondingly further includes:
The operation control subsystem sends a closing signal to the second steam generation subsystem when the superheated steam difference value is less than or equal to zero;
And when the superheated steam difference value is smaller than zero, the operation control subsystem takes the absolute value of the superheated steam difference value as the redundant superheated steam quantity, and correspondingly takes the redundant superheated steam quantity as the superheated steam storage quantity of the next period.
Optionally, the steam injection subsystem further comprises a first steam pipeline, a second steam pipeline, a steam injection main pipe, a first check valve and a second check valve;
The first steam pipeline is used for connecting the heat absorber and the steam injection main pipe, the first one-way valve is arranged on the first steam pipeline, and the first superheated steam generated when the first one-way valve is opened by the first steam pipeline is input into the steam injection main pipe;
The second steam pipeline is used for connecting the steam injection boiler and the steam injection main pipe, the second one-way valve is arranged on the second steam pipeline, and the second superheated steam generated by the second steam pipeline when the second one-way valve is opened is input into the steam injection main pipe;
the steam injection main pipe is connected with the steam injection well and is used for injecting the first superheated steam and/or the second superheated steam into the steam injection well.
Optionally, the first steam generation subsystem further comprises a heliostat, a first water pump, a first deaerator, a heat absorption tower, and a first superheated steam detector;
the heliostat is used for reflecting and gathering sunlight to the heat absorber;
The first deaerator is used for accessing and treating first softened water provided by the softening equipment to remove first gas in the first softened water, wherein the first gas comprises dissolved oxygen;
The first water pump is connected with the first deaerator and the heat absorber and is used for injecting first softened water treated by the first deaerator into the heat absorber to serve as a first water working medium;
the heat absorber is arranged at the top of the heat absorption tower;
the first superheated steam detector is arranged on the first steam pipeline and is used for detecting the quantity of the first superheated steam generated by the heat absorber.
Optionally, the second steam generation subsystem further comprises a second water pump, a second deaerator, and a second superheated steam detector;
The second deaerator is used for accessing and treating second softened water provided by the softening equipment to remove second gas in the second softened water, and the second gas comprises dissolved oxygen;
the second water pump is connected with the second deaerator and the steam injection boiler and is used for injecting second softened water treated by the second deaerator into the steam injection boiler to serve as a second water working medium;
the second superheated steam detector is arranged on the second steam pipeline and is used for detecting the amount of the second superheated steam generated by the steam injection boiler.
On the other hand, the embodiment of the application also provides a thickened oil SAGD exploitation system, which comprises a production well and the steam system in the embodiment;
the production well is a horizontal well, the horizontal section of the production well is positioned in an oil reservoir containing thickened oil and is parallel to the horizontal section of a steam injection well in the steam system, and the horizontal section of the production well is positioned below the horizontal section of the steam injection well.
On the other hand, the embodiment of the application also provides a thick oil SAGD superheated steam control method, which is applied to the operation control subsystem in the steam system described in the above embodiment, and comprises the following steps:
periodically acquiring the amount of the first superheated steam detected by the first superheated steam detector and the superheated steam storage amount of the current period in the underground steam cavity;
calculating a superheated steam difference value according to the required superheated steam amount, the superheated steam storage amount of the current period and the first superheated steam amount;
and sending an opening or closing signal to the second steam generation subsystem according to the superheated steam difference value.
Optionally, the generating an on or off signal to the second steam generating subsystem according to the superheated steam difference value includes:
Sending an opening signal to the second steam generation subsystem when the superheated steam difference value is greater than zero;
Taking the difference value of the superheated steam as the required quantity of the second superheated steam, and correspondingly setting the power of the steam injection boiler according to the required quantity of the second superheated steam;
Or sending a shut down signal to the second steam generation subsystem when the superheated steam difference is less than or equal to zero;
And when the difference value of the superheated steam is smaller than zero, taking the absolute value of the difference value of the superheated steam as the excessive superheated steam quantity, and correspondingly taking the excessive superheated steam quantity as the superheated steam storage quantity of the next period.
Compared with the related art, the steam system, the thick oil SAGD exploitation system and the superheated steam control method fully utilize the underground steam cavity formed in the thick oil SAGD exploitation process to store the superheated steam and release the superheated steam, not only can fully utilize solar energy, but also can stabilize fluctuation of the superheated steam quantity caused by unstable solar energy, the control algorithm of the operation control subsystem is simple, the dynamic regulation and control process speed is high, and the superheated steam production system with low cost, stable superheated steam yield and rapid dynamic response is provided for clean and efficient exploitation of thick oil.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide an understanding of the principles of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the principles of the application.
Figure 1 is a schematic diagram of a steam system and a heavy oil SAGD recovery system according to an embodiment of the present application,
FIG. 2 is a flow chart of a thick oil SAGD superheated steam control method according to an embodiment of the present application.
Wherein, the reference numerals are as follows:
The system comprises an 11 heat absorber, a 12 heliostat, a 13 first water pump, a 14 first deaerator, a 15 heat absorption tower, a 16 first superheated steam detector, a 21 steam injection boiler, a22 second water pump, a 23 second deaerator, a24 second superheated steam detector, a 31 steam injection well, a 32 underground steam cavity, a 33 first steam pipeline, a 34 second steam pipeline, a 35 steam injection main pipe, a 36 first check valve, a 37 second check valve, a 4 operation control subsystem, a 5 oil storage layer and a 6 production well.
Detailed Description
The present application has been described in terms of several embodiments, but the description is illustrative and not restrictive, and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the described embodiments. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of the present application may also be combined with any conventional features or elements to form a unique inventive arrangement as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement as defined in the claims. It is therefore to be understood that any of the features shown and/or discussed in the present application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
Furthermore, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other sequences of steps are possible as will be appreciated by those of ordinary skill in the art. Accordingly, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
The SAGD exploitation principle is to inject high-temperature high-pressure superheated steam into an oil reservoir, heat the oil reservoir by utilizing steam vaporization latent heat, reduce the viscosity of thick oil, increase the fluidity of the thick oil, enable the heated crude oil to directly flow into a production well, and obtain higher oil exploitation speed by utilizing the production of a horizontal well under the action of gravity, thereby achieving the purposes of exploitation and improvement of the recovery ratio. In the specific implementation mode, a double horizontal well structure is generally adopted, two parallel horizontal wells are drilled at the bottom of an oil layer, an upper horizontal well is used as a steam injection well, and a lower horizontal well is used as a production well for oil extraction. Saturated steam in injected steam is covered upwards, heated crude oil and steam condensate water are discharged to a production well below by gravity, and the crude oil and the steam condensate water are extracted together with the saturated water. Under the large trend of low carbon globalization and national 'double carbon' targets, at present, solar energy is more adopted in SAGD exploitation to carry out steam production so as to realize low carbon exploitation of thick oil, but a large amount of ground heat storage systems are still required to be matched with production of superheated steam, but because the ground heat storage tank systems are large in scale, high in investment and high in operation and maintenance cost, the cost of thick oil production and development is increased, and a superheated steam production system which can fully utilize solar energy and guarantee the requirement of thick oil development and production and is low in cost is urgently needed.
The embodiment of the application provides a steam system which is applied to a thick oil SAGD exploitation system, as shown in figure 1, and comprises a first steam generation subsystem 1, a second steam generation subsystem 2, a steam injection subsystem 3 and an operation control subsystem 4;
The first steam generation subsystem 1 comprises a heat absorber 11, wherein the heat absorber 11 is used for collecting solar radiation energy, heating a first water working medium in the heat absorber to generate first superheated steam, and inputting the first superheated steam into the steam injection subsystem 3;
The second steam generation subsystem 2 comprises a steam injection boiler 21, and the steam injection boiler 21 is used for heating a second water working medium in the second steam generation subsystem 2 to generate second superheated steam when the second steam generation subsystem 2 is started and inputting the second superheated steam into the steam injection subsystem 3;
The steam injection subsystem 3 comprises a steam injection well 31 and an underground steam cavity 32, wherein the steam injection well 31 is used for injecting the input superheated steam into the underground steam cavity 32, the underground steam cavity 32 is positioned above the oil storage layer 5 and used for storing the superheated steam and releasing the superheated steam to the oil storage layer 5 so that the heated thick oil in the oil storage layer 5 is conveyed to a production well 6 through steam driving force and gravity driving force, and the superheated steam comprises the first superheated steam and/or the second superheated steam;
The operation control subsystem 4 is configured to periodically calculate a superheated steam difference value according to a required superheated steam amount, a superheated steam storage amount in the underground steam cavity, and the first superheated steam, and correspondingly send an on or off signal to the second steam generation subsystem 2 according to the calculated superheated steam difference value.
In this embodiment, the heat absorber 11 of the first steam generating subsystem 1 may be a heat absorber of an existing tower-type concentrating and heat collecting system, including but not limited to a calandria heat absorber, a finned tube heat absorber, a heat pipe heat absorber, a spiral coil heat absorber, or a cavity heat absorber, where the heat absorber heats the first superheated steam generated by the first water working medium as a preferred source of the superheated steam in the heavy oil SAGD mining system.
In this embodiment, the steam injection boiler 21 of the second steam generating subsystem 2 may generate the second superheated steam by combusting fossil energy such as coal and natural gas, where the second steam generating subsystem 2 has a higher carbon emission intensity than the first steam generating subsystem 1, and the superheated steam generated by the first steam generating subsystem 1 and the superheated steam stored in the underground steam chamber 32 are used as the alternative sources of the superheated steam in the thick oil SAGD exploitation system when the storage amount of the superheated steam is insufficient to meet the actual production requirement of the thick oil.
In this embodiment, during the process of heavy oil SAGD exploitation, the crude oil in the oil reservoir 5 is heated by superheated steam, the heated crude oil and the condensed water of the steam are drained to the production well 6 below by gravity, and are extracted together with saturated water, the pore volume of the crude oil produced is occupied by steam, so as to form the underground steam cavity 32, and the underground steam cavity 32 has good heat storage condition, and when the intensity of solar radiation is low, such as in rainy days or at night, although the productivity of the first steam generation subsystem has been greatly reduced, the superheated steam stored in the underground steam cavity 32 can still be utilized to heat the oil reservoir 5 for a period of time, and the oil field production will not stop immediately.
In this embodiment, when the intensity of solar irradiation is high and the amount of the first superheated steam generated by the first steam generating subsystem 1 is greater than the amount of superheated steam required for crude oil production, the excess superheated steam may be stored in the underground steam chamber 32.
In this embodiment, the operation control subsystem 4 periodically calculates the difference value of the superheated steam, and the periodic time setting may refer to the weather condition and the solar rise and fall rule of the production well.
The steam system of the embodiment does not provide a ground heat storage system, fully utilizes an underground steam cavity formed in the thick oil SAGD exploitation process to store redundant superheated steam and release the superheated steam, couples the solar steam system and the steam injection boiler steam system to operate and coordinate and control, not only can fully utilize solar energy, but also stabilizes fluctuation of the superheated steam caused by unstable solar energy, has the advantages of simple superheated steam control method, small calculated amount, high dynamic regulation and control process speed, low requirement on hardware of an operation control subsystem, easy realization, and provides a superheated steam production system with low cost, stable superheated steam yield and rapid dynamic response for clean and efficient exploitation of thick oil.
In an exemplary embodiment, the operation control subsystem is configured to periodically calculate a superheated steam difference value based on a desired superheated steam amount, a superheated steam storage amount in the subsurface steam chamber, and the first superheated steam amount, comprising:
The operation control subsystem 4 calculates the required superheated steam amount of the thickened oil SAGD production system according to the preset thickened oil production amount of the production well;
the operation control subsystem 4 periodically calculates an existing superheated steam amount, which is the sum of the first superheated steam amount and the superheated steam storage amount of the current period, and calculates the superheated steam difference value based on the required superheated steam amount, which is the difference value between the required superheated steam amount and the existing superheated steam amount.
In this embodiment, the superheated steam storage amount in the current period is an accumulated value from the first period to the current period, and the superheated steam storage amount may be obtained by performing an accumulated calculation by the operation control subsystem 4.
In one implementation of this embodiment, the operation control subsystem 4 may provide an input interface of the thick oil production amount, so as to supply the field staff with the thick oil production amount setting, and the operation control subsystem 4 calculates the required superheated steam amount according to the input thick oil production amount.
In another implementation of this embodiment, the operation control subsystem 4 may store the thickened oil production of the production well, and the operation control subsystem 4 reads the thickened oil production and calculates the required superheated steam amount according to the read result.
In an exemplary embodiment, said sending an on or off signal to the second steam generating subsystem 2 according to the calculated superheated steam difference value, respectively, comprises:
The operation control subsystem 4 sends an opening signal to the second steam generation subsystem 2 when the superheated steam difference value is greater than zero;
After the second steam generating subsystem 2 is turned on, the operation control subsystem 4 uses the difference value of the superheated steam as a second superheated steam demand, and accordingly sets the power of the steam injection boiler 21 according to the second superheated steam demand.
In an exemplary embodiment, the sending of the on or off signal to the second steam generating subsystem 2 according to the calculated superheated steam difference value, respectively, further comprises:
The operation control subsystem 4 sends a closing signal to the second steam generation subsystem 2 when the superheated steam difference value is less than or equal to zero;
When the difference value of the superheated steam is smaller than zero, the operation control subsystem 4 takes the absolute value of the difference value of the superheated steam as the excessive superheated steam quantity, and correspondingly takes the excessive superheated steam quantity as the superheated steam storage quantity of the next period.
In an exemplary embodiment, the steam injection subsystem 3 further comprises a first steam pipe 33, a second steam pipe 34, a steam injection main 35, a first check valve 36 and a second check valve 37;
The first steam pipe 33 is used for connecting the heat absorber 11 and the steam injection main 35, the first check valve 36 is arranged on the first steam pipe 33, and the first superheated steam generated by the first steam pipe 33 when the first check valve 36 is opened is input into the steam injection main 35;
The second steam pipe 34 is used for connecting the steam injection boiler 21 and the steam injection main pipe 35, the second check valve 37 is arranged on the second steam pipe 34, and the second superheated steam generated when the second check valve 37 is opened by the second steam pipe 34 is input into the steam injection main pipe 35;
the steam injection parent pipe 35 is connected to the steam injection well 31, and is used for injecting the first superheated steam and/or the second superheated steam into the steam injection well 31.
In this embodiment, the first check valve 36 and the second check valve 37 may be controlled by the operation control subsystem 4, only the first check valve 36 is opened to avoid the reverse flow of the first superheated steam when the first steam generating subsystem 1 is operated, only the second check valve 37 is opened to avoid the reverse flow of the second superheated steam when the second steam generating subsystem 2 is operated, and the first check valve 36 and the second check valve 37 are opened simultaneously when the first steam generating subsystem 1 and the second steam generating subsystem 2 are operated simultaneously.
In an exemplary embodiment, the first steam generation subsystem further comprises a heliostat 12, a first water pump 13, a first deoxygenator 14, a heat absorption tower 15, and a first superheated steam detector 16;
the heliostat 12 is configured to reflect and concentrate sunlight to the heat absorber 11;
The first deaerator 14 is used for accessing and treating first softened water provided by a softening device, and removing first gas in the first softened water, wherein the first gas comprises dissolved oxygen;
The first water pump 13 is connected with the first deaerator 14 and the heat absorber 11, and is used for injecting first softened water treated by the first deaerator 14 into the heat absorber 11 to serve as a first water working medium;
the heat absorber 11 is arranged at the top of the heat absorbing tower 15;
the first superheated steam detector 16 is disposed on the first steam pipe 33 for detecting the amount of the first superheated steam generated by the heat absorber 11.
In this embodiment, the heliostats 12 may form a heliostat field array that reflects solar radiation onto the heat absorber 11 at the top of the heat absorber tower 15, and the heliostats 12 may include, but are not limited to, a tensioned metal film mirror or a silvered glass mirror from a specular material.
In this embodiment, the first gas includes, but is not limited to, dissolved oxygen, and may also include a gas such as carbon dioxide dissolved in the first softened water.
In this embodiment, the first superheated steam detector may detect a flow rate, a temperature and a pressure of the first superheated steam, obtain the amount of the first superheated steam through the flow rate of the first superheated steam, and determine whether the first superheated steam reaches a temperature and a pressure standard of the superheated steam required for the SAGD exploitation of the thickened oil through detecting the temperature and the pressure of the first superheated steam.
In an exemplary embodiment, the second steam generation subsystem further comprises a second water pump 22, a second deaerator 23, and a second superheated steam detector 24;
the second deaerator 23 is used for introducing and treating second softened water provided by the softening device, and removing second gas in the second softened water, wherein the second gas comprises dissolved oxygen;
The second water pump 22 is connected with the second deaerator 23 and the steam injection boiler 21, and is used for injecting second softened water treated by the second deaerator 23 into the steam injection boiler 21 to serve as a second water working medium;
The second superheated steam detector 24 is disposed on the second steam pipe 34 for detecting an amount of the second superheated steam generated by the steam injection boiler 21.
In this embodiment, the second gas includes, but is not limited to, dissolved oxygen, and may also include a gas such as carbon dioxide dissolved in the second softened water.
In this embodiment, the second superheated steam detector 24 may detect the flow rate, temperature and pressure of the second superheated steam, obtain the amount of the second superheated steam from the flow rate of the second superheated steam, and determine whether the second superheated steam meets the temperature and pressure criteria of the superheated steam required for the SAGD recovery of heavy oil by detecting the temperature and pressure of the second superheated steam.
The embodiment of the application also provides a thickened oil SAGD exploitation system, as shown in figure 1, comprising a production well 6 and the steam system provided by the embodiment;
The production well 6 is a horizontal well, the horizontal section of which is located in the reservoir 5 containing thickened oil and is parallel to the horizontal section of the steam injection well 31 in the steam system, and the horizontal section of the production well 6 is located below the horizontal section of the steam injection well 31.
The steam system in the embodiment comprises a first steam generation subsystem 1, a second steam generation subsystem 2, a steam injection subsystem 3 and an operation control subsystem 4, wherein the first steam generation subsystem 1 comprises a heat absorber 11, a heliostat 12, a first water pump 13, a first deaerator 14, a heat absorption tower 15 and a first superheated steam detector 16, the second steam generation subsystem 2 comprises a steam injection boiler 21, a second water pump 22, a second deaerator 23 and a second superheated steam detector 24, and the steam injection subsystem 3 comprises a steam injection well 31, an underground steam cavity 32, a first steam pipeline 33, a second steam pipeline 34, a steam injection parent pipe 35, a first check valve 36 and a second check valve 37.
The embodiment of the application also provides a thickened oil SAGD superheated steam control method which is applied to the operation control subsystem in the steam system provided by the embodiment, as shown in FIG. 2, and comprises the steps of S100-S300:
S100, periodically acquiring the quantity of the first superheated steam detected by the first superheated steam detector and the superheated steam storage quantity of the current period in the underground steam cavity;
S200, calculating a superheated steam difference value according to the required superheated steam quantity, the superheated steam storage quantity of the current period and the first superheated steam quantity;
and S300, sending an opening or closing signal to the second steam generation subsystem according to the superheated steam difference value.
In this embodiment, step S200 includes steps S210 to S230:
S210, calculating the required superheated steam quantity of the thick oil SAGD exploitation system according to the preset thick oil production quantity of the production well;
s220, periodically calculating the existing superheated steam quantity which is the sum of the first superheated steam quantity and the superheated steam storage quantity of the current period;
s230, calculating a difference value between the required superheated steam quantity and the existing superheated steam quantity, and taking the calculated result as the superheated steam difference value.
In one implementation manner of this embodiment, the difference value of the superheated steam calculated in S230 is greater than zero, and step S300 performs S311 to S312:
S311, sending an opening signal to the second steam generation subsystem;
and S312, taking the difference value of the superheated steam as the required quantity of the second superheated steam, and correspondingly setting the power of the steam injection boiler according to the second superheated steam quantity.
In another implementation manner of the embodiment, the difference value of the superheated steam calculated in the step S230 is smaller than zero, the step S300 is executed in the steps S321-S322, the difference value of the superheated steam calculated in the step S230 is equal to zero, and the step S300 is executed in the step S321 only;
s321, sending a closing signal to the second steam generation subsystem;
s322, taking the absolute value of the difference value of the superheated steam as the excessive superheated steam quantity, and correspondingly taking the excessive superheated steam quantity as the superheated steam storage quantity of the next period.
The thick oil SAGD superheated steam control method described above is specifically described below with an example:
in the first period, the initial value of the superheated steam storage amount is set to 0.
In a first period, the operation control subsystem obtains the quantity of the first superheated steam detected by the first superheated steam detector to be v11=8000 m 3, and the obtained superheated steam storage quantity to be v21=0;
The operation control subsystem calculates the required superheated steam quantity of the thick oil SAGD exploitation system to be V31=10000 m 3 according to the thick oil production quantity of a preset production well;
The operation control subsystem calculates the existing superheated steam volume v41=v11+v21=8000 m 3;
The operation control subsystem calculates a superheated steam difference value v51=v31-v41=2000 m 3;
The operation control subsystem judges that V51 is more than 0 and sends an opening signal to the second steam generation subsystem;
The operation control subsystem takes V51=2000 m 3 as the demand of the second superheated steam, and correspondingly sets the power of the steam injection boiler according to V51=2000 m 3;
at the end of the first period, the first superheated steam 8000m 3 and the second superheated steam subsystem are used up according to the second superheated steam requirement v51=2000 m 3, and the superheated steam storage capacity at the moment is 0, i.e. for the second period, the superheated steam storage capacity is v22=0;
In a second period, the operation control subsystem acquires that the amount of the first superheated steam detected by the first superheated steam detector is v12=30000 m 3, and the acquired superheated steam storage amount is v22=0;
The operation control subsystem calculates the required superheated steam quantity of the thick oil SAGD exploitation system to be V32 = 10000m 3 according to the thick oil production quantity of the preset production well;
the operation control subsystem calculates the existing superheated steam volume v42=v12+v22=30000 m 3;
The operation control subsystem calculates a superheated steam difference value v52=v32-v42= -20000m 3;
The operation control subsystem judges that V52 is less than 0 and sends a closing signal to the second steam generation subsystem;
The operation control subsystem takes the absolute value |v52|=20000m 3 of V52 as the excessive superheated steam quantity, and takes |v52|asthe superheated steam storage quantity of the third period, namely v23=20000m 3;
In a third period, the operation control subsystem acquires that the amount of the first superheated steam detected by the first superheated steam detector is v13=5000 m 3, and the acquired superheated steam storage amount is v23=20000 m 3;
the operation control subsystem calculates the required superheated steam quantity of the thick oil SAGD exploitation system to be V33 = 10000m 3 according to the thick oil production quantity of the preset production well;
The operation control subsystem calculates the existing superheated steam volume v43=v13+v23=25000 m 3;
The operation control subsystem calculates a superheated steam difference value v53=v33-v43= -15000m 3;
the operation control subsystem judges that V53 is less than 0 and sends a closing signal to the second steam generation subsystem;
The operation control subsystem takes the absolute value |v53|=15000 m 3 of V53 as the excessive superheated steam amount and takes |v53|asthe superheated steam storage amount of the fourth period, namely v24=15000 m 3;
In a fourth period, due to continuous overcast and rainy weather, the operation control subsystem acquires that the amount of the first superheated steam detected by the first superheated steam detector is v14=0m 3, and the acquired superheated steam storage amount is v24=20000m 3;
The operation control subsystem calculates the required superheated steam quantity of the thick oil SAGD exploitation system to be V34 = 10000m 3 according to the thick oil production quantity of the preset production well;
the operation control subsystem calculates the existing superheated steam volume v44=v14+v24=20000 m 3;
the operation control subsystem calculates a superheated steam difference value V54=V34-V44= -10000m 3;
The operation control subsystem judges that V54 is less than 0 and sends a closing signal to the second steam generation subsystem;
The operation control subsystem takes the absolute value |v54|=10000 m 3 of V54 as the excessive superheated steam amount and the absolute value |v54| as the superheated steam storage amount of the fifth cycle, that is, v25=10000 m 3.
To facilitate understanding of the meaning of the parameters in the above examples, see table 1 below.
Table 1 description table of parameters in the example
| First period of | Second period | Third period | Fourth period of time | Fifth period | |
| The amount of the first superheated steam | V11 | V12 | V13 | V14 | |
| Storage of superheated steam | V21 | V22 | V23 | V24 | V25 |
| The required superheated steam quantity | V31 | V32 | V33 | V34 | |
| The quantity of the superheated steam is | V41 | V42 | V43 | V44 | |
| Difference of superheated steam | V51 | V52 | V53 | V54 |
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components, for example, one physical component may have a plurality of functions, or one function or step may be cooperatively performed by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
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| FR2901838A1 (en) * | 2006-06-02 | 2007-12-07 | Inst Francais Du Petrole | OPTIMIZED METHOD AND INSTALLATION FOR HEAVY-DUTY RECOVERY RECOVERY USING SOLAR ENERGY VAPOR INJECTION |
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| FR2901838A1 (en) * | 2006-06-02 | 2007-12-07 | Inst Francais Du Petrole | OPTIMIZED METHOD AND INSTALLATION FOR HEAVY-DUTY RECOVERY RECOVERY USING SOLAR ENERGY VAPOR INJECTION |
| US20100000733A1 (en) * | 2008-07-03 | 2010-01-07 | Matteo Chiesa | Apparatus and Method for Energy-Efficient and Environmentally-friendly Recovery of Bitumen |
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