CN115142826B - Prediction method for thickened oil combustion heat release quantity - Google Patents
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
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- 230000008569 process Effects 0.000 claims abstract description 20
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 15
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000010779 crude oil Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 9
- GWVDBZWVFGFBCN-UHFFFAOYSA-N tetratriacontane Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC GWVDBZWVFGFBCN-UHFFFAOYSA-N 0.000 claims description 8
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 claims description 6
- -1 n-docosyl Chemical group 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 239000003027 oil sand Substances 0.000 claims description 4
- KMXFZRSJMDYPPG-UHFFFAOYSA-N tetratetracontane Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC KMXFZRSJMDYPPG-UHFFFAOYSA-N 0.000 claims description 4
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
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- BGHCVCJVXZWKCC-UHFFFAOYSA-N tetradecane Chemical compound CCCCCCCCCCCCCC BGHCVCJVXZWKCC-UHFFFAOYSA-N 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
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- YCOZIPAWZNQLMR-UHFFFAOYSA-N heptane - octane Natural products CCCCCCCCCCCCCCC YCOZIPAWZNQLMR-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention provides a prediction method for the combustion heat release amount of thick oil. The method comprises the following steps: step 1, burning target thick oil through a combustion pool device under a first pressure condition and a first heating rate condition, and obtaining CO and CO in the burning output gas by using a gas analyzer 2 Is a total amount of the produced products; step 2, burning the n-alkanes with different carbon numbers through a combustion pool device under the second pressure condition and the second heating rate condition to obtain the CO and the CO of the n-alkanes 2 A standard curve of the total generated amount; step 3, burning the target thickened oil obtained in the step 1 to produce CO and CO of gas 2 Interpolating the total generated amount of the target thickened oil combustion component into a standard curve to obtain the average carbon number of the target thickened oil combustion component; and 4, obtaining the heat release amount of the target thick oil combustion through a formula I, and further obtaining the static live wire temperature value of the target thick oil combustion process through a formula II and a formula III. The method is suitable for calculating the combustion quantity and predicting the oil layer temperature field in the thick oil fireflood process.
Description
Technical Field
The invention relates to the field of thick oil fireflood technical exploitation, in particular to a prediction method of thick oil combustion heat release quantity.
Background
Fireflood technology has long been considered a very potential method for recovery of thick and ultra-thick oil, which has been developed over the last 100 years for mining applications in multiple countries (e.g., united states, romania, etc.), and has proven to be an efficient enhanced recovery method for thick oil. Compared with other recovery method, the in-situ combustion technology has the following advantages:
(1) Air is used as injection gas, so that the cost is low and the collection is easy;
(2) Most of crude oil components participating in underground combustion are industrially valuable heavy components, and crude oil can be modified to a certain extent through fire flooding;
(3) Compared with other thermal oil extraction technologies, the heat loss and economic loss caused by medium heat dissipation can not occur;
(4) The crude oil displacement efficiency is extremely high, almost no crude oil residue exists in a burnt zone, and the oil reservoir recovery ratio is more than 60%;
(5) The oil displacement mechanism comprises thermal viscosity reduction, steam displacement and CO 2 The oil displacement effect is good in various forms such as non-miscible flooding.
By quantitatively analyzing the underground combustion capacity and heat contribution of the thick oil, a calculation method of the temperature of the front edge of the live wire and the temperature field of the oil layer is established, so that a basis can be provided for the prediction of the fire flooding effect and the optimization and adjustment of the fire flooding scheme.
The one-dimensional combustion tube model is commonly used in an indoor experiment of thick oil fireflood, but because the thick oil fireflood has small volume and can not simulate the problem of non-uniformity of an oil layer and one injection and multiple production, the influence of important parameters such as design of a gas injection scheme, distribution of residual oil, non-uniformity and the like on fireflood effect is difficult to be studied deeply. And the space distribution rules of the front edge of the fire wire and the outer edge of the coking zone cannot be revealed, and the saturation field distribution, the oil wall movement, the output dynamics and the like cannot be studied, so that the limitation is large. At present, in mine field tests at home and abroad, how to set well pattern well spacing, how to adjust gas injection scheme to obtain more stable and effective fireflood process and the like are not yet studied deeply. The influence of important parameters such as air injection rate, injection pattern, well spacing and the like on the fireflood effect is also needed to be researched and ascertained. However, the most basic content in the researches is the research on a calculation method of total heat release and live wire front edge temperature in the underground combustion process of the thick oil. Therefore, the importance and urgency of developing related studies are self-evident.
In indoor research, the temperature of the thick oil combustion front position can be directly measured by experiments, and the heat release quantity can be converted into the ambient temperature by firstly obtaining the heat release quantity and then combining a chemical thermodynamic formula. In the on-site thick oil exploitation process, the underground combustion process of thick oil also needs to consider the flowing process, namely, only part of heavy components of thick oil participate in the combustion reaction, and the rest part is heated and evaporated, displaced by flue gas and mixed with cold oil to flow into a production well. Therefore, by determining the average carbon number of thick oil combustion, the heat release amount of the thick oil underground combustion process can be accurately obtained, and further, the temperature calculation result which is closer to the actual fireflood process is obtained.
Since thick oil is a complex mixture, which components burn off in the actual reservoir determines its exotherm and the temperature of the reservoir. Different oil layer conditions and gas injection processes make the burnt components have large differences, so that the actual heat release amount is difficult to calculate accurately.
Disclosure of Invention
The invention mainly aims to provide a prediction method for the combustion heat release amount of thick oil, which aims to solve the problem that in the prior art, the actual heat release amount is difficult to accurately calculate due to complex thick oil components.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for predicting the combustion heat release amount of thick oil, comprising the steps of: step 1, burning target thick oil through a combustion pool device under a first pressure condition and a first heating rate condition, and obtaining CO and CO in the burning output gas by using a gas analyzer 2 Is a total amount of the produced products; step 2, burning the n-alkanes with different carbon numbers through a combustion pool device under the second pressure condition and the second heating rate condition to obtain the CO and the CO of the n-alkanes with different carbon numbers 2 A standard curve of total production, wherein the second pressure condition is the same as the first pressure condition, and the second temperature rising rate condition is the same as the first temperature rising rate conditionThe temperature rising rate is the same, and the weights of the normal paraffins with different carbon numbers are respectively equal to the weight of the target thick oil; step 3, burning the target thickened oil obtained in the step 1 to produce CO and CO of gas 2 Interpolating the total generated amount of the target thickened oil combustion component into the standard curve obtained in the step 2 to obtain the average carbon number of the target thickened oil combustion component; step 4, obtaining the heat release amount of target thick oil combustion through a formula I, and further obtaining the static live wire temperature value of the target thick oil combustion process through a formula II and a formula III;
q=650 n+200 formula I
Q crudeoil =c·m·Δt formula II
T Live wire ＝T Original stratum +DeltaT equation III
Q represents the heat release amount of target thick oil combustion, and the unit is kJ; n is the average carbon number of the target thick oil combustion component; q (Q) crudeoil Represents the total heat release of the thick oil combustion components, and the unit is kJ; c represents the specific heat capacity of the reservoir rock, in J/(kg. DEG C); m represents the heated rock volume in m 3 The method comprises the steps of carrying out a first treatment on the surface of the Delta T represents the highest temperature difference of reservoir environments before and after combustion in degrees Celsius; t (T) Live wire A static live temperature value representing a target thick oil combustion process; t (T) Original stratum Representing the initial temperature of the reservoir before fireflood, and the production well test result from the target block;
further, step 1 includes: selecting quartz sand with 40-60 meshes, stirring and mixing the quartz sand and the target thick oil according to the mass ratio of 10:0.5, and sequentially filling a combustion pond device according to the sequence of 5g of quartz sand at the bottom, 10.5g of mixed oil sand of the quartz sand and the target thick oil in the middle and 10g of quartz sand at the top; firstly, nitrogen is injected into the combustion tank device at the rate of 2L/min, and then air is injected into the combustion tank device at the rate of 2L/min; starting a heating furnace of the combustion pool device, and linearly heating the heating furnace to 600 ℃ according to a first heating rate condition, wherein the injection rate of air is unchanged all the time; obtaining CO and CO in the generated gas in the combustion tank through a gas analyzer 2 Thereby obtaining the CO and CO in the gas produced by the target thick oil combustion 2 Is added to the total amount of the product.
Further, in the process of burning n-alkanes with different carbon numbers by the combustion tank device in the step 2, the adopted process conditions are the same as those in the step S1.
Further, n-alkanes of different carbon numbers are selected from n-dodecane, n-hexadecane, n-docosyl, n-octacosyl, n-tetratriacontane and n-tetratetracosane.
Further, CO and CO 2 The step of the total generation amount of (a) includes: measurement of CO and CO in gases produced by combustion of heavy oils or normal paraffins of different carbon numbers by means of a gas analyser 2 Concentration profile of (2); calculating to obtain CO and CO according to the following formula IV by using a concentration change curve 2 Is a total amount of the produced:
wherein the method comprises the steps ofRepresents CO and CO 2 Q represents the injection rate of air during combustion, +.>Represents CO and CO 2 Instantaneous concentration values.
Further, CO and CO in the obtained thick oil combustion output gas 2 After the total amount of production of (2), step 1 further includes the step of calculating the fuel utilization according to formula v:
FA represents fuel utilization, g is 2.
The invention is suitable for the method for calculating the combustion quantity and predicting the oil layer temperature field in the thick oil fireflood process, and utilizes the normal alkane standard combustion curve (namely the CO discharged by combustion) obtained by the combustion tank experiment under the conditions of a certain heating rate and a certain pressure x Relation between total amount and carbon number), a phase can be obtained by interpolationThe average carbon number of the thick oil combustion components is calculated, the total heat release amount in the thick oil combustion process is calculated, the calculated total heat value is converted into the highest temperature of the rising environment by utilizing a specific heat capacity formula, and the basis is provided for researching the dynamic changes of the front edge temperature and the coking zone and the temperature field distribution in the live wire propulsion process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view showing the construction of a combustion tank apparatus employed in embodiment 1 according to the present invention;
FIG. 2 shows a schematic diagram of a manner of burning Chi Zhongzhuang material in example 1 according to the present invention;
FIG. 3 shows CO+CO in the gas produced by the combustion of heavy oil according to example 1 of the present invention 2 Is a concentration profile of (2);
FIG. 4 shows the carbon number and CO+CO in normal paraffins of different carbon numbers according to example 1 of the present invention 2 A standard curve corresponding to the total generated quantity;
FIG. 5 shows a graph of the high resolution technique of step 5 characterizing different carbon numbers in a heavy oil according to example 1 of the present invention;
FIG. 6 is a schematic view showing the structure of a one-dimensional burner tube used in step 6 of embodiment 1 according to the present invention;
fig. 7 shows the experimental results of the one-dimensional burner tube of step 6 in example 1 according to the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As described in the background section, since heavy oil is a complex mixture, which components burn off in the actual reservoir determines its exotherm and the temperature of the reservoir. Different oil layer conditions and gas injection processes make the burnt components have large differences, so that the actual heat release amount is difficult to calculate accurately.
In order to solve the problem, the invention provides a prediction method of the combustion heat release amount of thick oil, which comprises the following steps: step 1, burning target thick oil through a combustion pool device under a first pressure condition and a first heating rate condition, and obtaining CO and CO in the burning output gas by using a gas analyzer 2 Is a total amount of the produced products; step 2, burning the n-alkanes with different carbon numbers through a combustion pool device under the second pressure condition and the second heating rate condition to obtain the CO and the CO of the n-alkanes with different carbon numbers 2 A standard curve of total generated quantity, wherein the second pressure condition is the same as the first pressure condition, the second temperature rising rate condition is the same as the second temperature rising rate condition, and the weights of normal paraffins with different carbon numbers are respectively equal to the weight of the target thick oil; step 3, burning the target thickened oil obtained in the step 1 to produce CO and CO of gas 2 Interpolating the total generated amount of the target thickened oil combustion component into the standard curve obtained in the step 2 to obtain the average carbon number of the target thickened oil combustion component; step 4, obtaining the heat release amount of target thick oil combustion through a formula I, and further obtaining the static live wire temperature value of the target thick oil combustion process through a formula II and a formula III;
q=650 n+200 formula I
Q crudeoil =c·m·Δt formula II
T Live wire ＝T Original stratum +DeltaT equation III
Q represents the heat release amount of target thick oil combustion, and the unit is kJ; n is the average carbon number of the target thick oil combustion component; q (Q) crudeoil Represents the total heat release of the thick oil combustion components, and the unit is kJ; c represents the specific heat capacity of the reservoir rock, in J/(kg. DEG C); m represents the heated rock volume in m 3 The method comprises the steps of carrying out a first treatment on the surface of the Delta T represents the highest temperature difference of reservoir environments before and after combustion in degrees Celsius; t (T) Live wire Representing the static live wire temperature value of the target thick oil combustion process, wherein the unit is DEG C; t (T) Original stratum Representing the initial temperature of the reservoir prior to flooding in degrees celsius and the production well test results from the target zone.
The invention is applicable toThe method for calculating the combustion quantity and predicting the oil layer temperature field in the thick oil fireflood process utilizes the normal alkane standard combustion curve (namely the CO emitted by combustion) obtained by the combustion pool experiment under the conditions of a certain heating rate and a certain pressure x The relation between the total amount and the carbon number), the average carbon number of the corresponding thick oil combustion component can be obtained through interpolation, the total heat release amount of the thick oil is calculated, the calculated total heat value is converted into the highest temperature of the rising environment by utilizing a specific heat capacity formula, and the basis is provided for researching the dynamic changes of the front edge temperature and the coking zone and the temperature field distribution in the live wire propulsion process.
In order to better simulate the combustion environment of heavy oil in the formation, in a preferred embodiment, step 1 comprises: selecting quartz sand with 40-60 meshes, stirring and mixing the quartz sand and the target thick oil according to the mass ratio of 10:0.5, and sequentially filling a combustion pond device according to the sequence of 5g of quartz sand at the bottom, 10.5g of mixed oil sand of the quartz sand and the target thick oil in the middle and 10g of quartz sand at the top; firstly, nitrogen is injected into the combustion tank device at the rate of 2L/min, and then air is injected into the combustion tank device at the rate of 2L/min; starting a heating furnace of the combustion pool device, and linearly heating the heating furnace to 600 ℃ according to a first heating rate condition, wherein the injection rate of air is unchanged all the time; obtaining CO and CO in the generated gas in the combustion tank through a gas analyzer 2 Thereby obtaining the CO and CO in the gas produced by the target thick oil combustion 2 Is added to the total amount of the product. More preferably, in the process of burning n-alkanes with different carbon numbers by the combustion tank device in the step 2, the same process conditions as in the step S1 are adopted.
The invention adopts normal paraffins with different carbon numbers as CO and CO 2 The test standard substance of the standard curve of the total generated quantity can avoid the influence of different molecular configurations and the like on the heat release regularity as much as possible, so that the standard curve is promoted to have stronger regularity, and the accuracy of the prediction method is further improved. In a preferred embodiment, the n-alkanes of different carbon numbers are selected from the group consisting of n-dodecane, n-hexadecane, n-docosyl, n-octacosyl, n-tetratriacontane and n-tetratetracontane. The n-alkanes are selected, which ensures regularity and embodies the thick oil as much as possibleDifferent carbon components, the measured average carbon number of the thick oil is more accurate.
Preferably, CO and CO 2 The step of the total generation amount of (a) includes: measurement of CO and CO in gases produced by combustion of heavy oils or normal paraffins of different carbon numbers by means of a gas analyser 2 Concentration profile of (2); calculating to obtain CO and CO according to the following formula IV by using a concentration change curve 2 Is a total amount of the produced:
wherein the method comprises the steps ofRepresents CO and CO 2 Q represents the injection rate of the gas during combustion, < >>Represents CO and CO 2 Instantaneous concentration values.
In a preferred embodiment, CO and CO in the combustion product gas resulting in a thick oil 2 After the total amount of production of (2), step 1 further includes the step of calculating the fuel utilization according to formula v:
FA represents fuel utilization, g is 2.
Since the fuel utilization rate FA of crude oil can be obtained from the above formula V due to the conservation of the carbon mole number in the combustion process, and the value of n is close to 2 according to the result of gas chromatography analysis, the invention selects n to be 2, namely the fuel utilization rate FA is 28 times CO+CO 2 Total amount of produced.
The present application is described in further detail below in conjunction with specific embodiments, which should not be construed as limiting the scope of the claims.
Example 1
The method comprises the following steps of burning thick oil and normal paraffins with different carbon numbers by using a combustion pool device (fig. 1, which comprises a combustion pool 1, a heating furnace 2, a temperature controller thermocouple 3, a temperature protection controller thermocouple 4, a gas flowmeter 5, a temperature protection controller 6, a room temperature measuring probe 7, a computer 8, a temperature controller 9, a filtering system 10, a gas analyzer 11 and a data recorder 12), obtaining the average carbon number of a target thick oil burning component by interpolation on a standard curve according to the relationship that the gas generation amounts are equal, calculating the burning amount by using an empirical formula, and predicting a temperature field, and specifically comprising the following steps:
in the experiment of the combustion pond (figure 2), quartz sand with 40-60 meshes is selected, the quartz sand and thick oil are fully stirred and mixed according to the mass ratio of 10:0.5, and the combustion pond is sequentially filled in the order of 'bottom 5g quartz sand A-middle 10.5g mixed oil sand B-top 10g quartz sand C'. In the experimental stage, nitrogen is injected at a rate of 2L/min to remove impurity gases, and then air is injected at a rate of 2L/min. After the oxygen content is stable, a certain heating rate is set and a heating furnace is started (the temperature is linearly increased from 25 ℃ to 600 ℃), and the air injection rate is always kept at 2L/min. CO+CO can be obtained by a gas analyzer 2 The concentration curve of (3) can be obtained by the formula IV 2 Is added to the total amount of the product.
Step 2, under the same experimental conditions, carrying out combustion reaction on normal paraffins (table 1) with different carbon numbers by using a combustion tank device to obtain paraffins with different carbon numbers and CO+CO 2 A standard curve corresponding to the total amount of production (fig. 4).
TABLE 1 State and purity of n-alkanes of different carbon numbers
| N-alkane species | State of matter | Purity of the substance |
| N-dodecane | Liquid state | 98％ |
| N-hexadecane | Liquid state | 99％ |
| N-docosane | Solid powder | 98％ |
| N-octacosane | Solid powder | 99％ |
| N-tetratriacontane | Solid state crystallization | ＞95％ |
| N-tetradecane | Solid state crystallization | ＞97％ |
And step 3, interpolating the result obtained in the step 1 onto the standard curve obtained in the step 2, so as to obtain the average carbon number of the target thick oil combustion component of 33-36.
And 4, obtaining the total heat release amount (14.8 KJ) and the fuel utilization rate FA (12-15%) of the target thick oil by using the formula I and the formula V, and further calculating the static live wire front edge temperature of the target thick oil by using the specific heat capacity formulas II and III (the method can still ensure that the relative error of the calculated temperature is within 10%).
And (3) verifying a prediction result:
for verification of the average carbon number of thick oil combustion, the carbon number distribution of the thick oil is obtained by utilizing a high-resolution technology, and the total mass percent of Cx (certain carbon number) to Cx (maximum carbon number detected) is obtained by an abundance weighting method, wherein the mass percent is just equal to the percentage of the components actually burnt, so that the average carbon number based on high-resolution mass spectrometry is obtained; and comparing the test results of the two to perform rationality verification. In addition, the difference between the theoretical live wire front edge temperature obtained through calculation and the actual combustion front edge temperature can be verified through a one-dimensional combustion tube experiment, and then the error of the method is given. The method comprises the following steps:
and 5, utilizing a high-resolution technology to characterize the distribution of different carbon numbers in the thick oil (figure 5), and obtaining the average carbon number of the target thick oil by an abundance weighting method. And (3) comparing the average carbon number obtained by the object model experiment in the step (III) to obtain a corresponding error range.
In the experiment of the one-dimensional combustion tube (figure 6), firstly, a certain inclination angle (used for simulating the inclination angle of the stratum) is kept by adjusting a back support, quartz sand, crude oil and kaolin (used for simulating stratum minerals) are uniformly mixed according to the mass ratio of 100:12:5, and 1000+/-100 g of the mixture is filled into the tube. After filling, the glass wool is wrapped at the pipe wall for heat preservation (preventing the heat loss in the experimental process from being too fast, and affecting the stable performance of the fire driving process).
The experimental stage of the burner tube includes a preheating stage and a combustion stage. In the preheating stage, nitrogen is injected at the speed of 2L/min, when the gas analyzer shows that the content of the detected gas is 0, the igniter is started (the ignition temperature is increased from 25 ℃ to 600 ℃ within 5 min), the igniter is kept to work for 30+/-10 min under the nitrogen atmosphere, and then the combustion stage is started. And when the combustion stage starts, stopping introducing nitrogen, injecting air into the combustion tube at a speed of 3L/min, and keeping the working temperature of the igniter at 600 ℃ unchanged (preventing the fire driving process from being unable to be stably carried out due to heat dissipation of the tube wall or heat carried by the air, and compensating for the heat of the part).
As shown in FIG. 7, under the condition of keeping the temperature of the igniter T1 unchanged, the temperature change of a certain position point in the whole fireflood process is measured by the thermocouples T2 to T6, and the highest temperature value of each temperature curve is regarded as the actual measured temperature of the fire wire in the study. And (3) comparing the calculated temperature with the static live wire temperature obtained in the step (IV), and obtaining the relative error between the calculated temperature and the actual temperature (Table 2).
TABLE 2 relative error between actual and predicted firing line temperatures
| Calculated live wire temperature value | Measured live wire temperature value | Error temperature value | Relative error | |
| T 3 Temperature (temperature) | 382.4℃ | 374.9℃ | 7.5℃ | 2.00％ |
| T 4 Temperature (temperature) | 612.5℃ | 581.2℃ | 31.3℃ | 5.39％ |
| T 5 Temperature (temperature) | 496.3℃ | 485.9℃ | 10.4℃ | 2.14％ |
| T 6 Temperature (temperature) | 555.4℃ | 522.0℃ | 33.4℃ | 6.40％ |
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The prediction method of the combustion heat release amount of the thickened oil is characterized by comprising the following steps of:
step 1, burning target thick oil through a combustion pool device under a first pressure condition and a first heating rate condition, and obtaining CO and CO in the burning output gas by using a gas analyzer 2 Is a total amount of the produced products;
step 2, burning the n-alkanes with different carbon numbers through the combustion pool device under the second pressure condition and the second heating rate condition to obtain the CO and the CO of the n-alkanes with different carbon numbers 2 A standard curve of total generated amount, wherein the second pressure condition is the same as the first pressure condition, the second temperature rising rate condition is the same as the first temperature rising rate condition, and the weights of the normal paraffins with different carbon numbers are respectively equal to the weight of the target thick oil;
step 3, burning the target thickened oil obtained in the step 1 to produce CO and CO of gas 2 Interpolating the total generated amount of the target thickened oil combustion component into the standard curve obtained in the step 2 to obtain the average carbon number of the target thickened oil combustion component;
step 4, obtaining the heat release amount of the target thick oil combustion through a formula I, and further obtaining the static live wire temperature value of the target thick oil combustion process through a formula II and a formula III;
q=650 n+200 formula I
Q crudeoil =c·m·Δt formula II
T Live wire ＝T Original stratum +DeltaT equation III
Q represents the heat release amount of the target thick oil combustion, and the unit is kJ; n is the average carbon number of the target thick oil combustion component; q (Q) crudeoil Represents the total heat release of the thick oil combustion components, and the unit is kJ; c represents the specific heat capacity of the reservoir rock, in J/(kg. DEG C); m represents the heated rock volume in m 3 The method comprises the steps of carrying out a first treatment on the surface of the Delta T represents the highest temperature difference of reservoir environments before and after combustion in degrees Celsius; t (T) Live wire A static live wire temperature value representing the target thick oil combustion process; t (T) Original stratum Representing the initial temperature of the reservoir prior to flooding, and the production well test results from the target zone.
2. The method for predicting the heat release of thick oil combustion according to claim 1, wherein the step 1 comprises:
selecting quartz sand with 40-60 meshes, stirring and mixing the quartz sand and the target thick oil according to the mass ratio of 10:0.5, and sequentially filling the combustion pool device according to the sequence of 5g of the quartz sand at the bottom, 10.5g of mixed oil sand of the quartz sand and the target thick oil in the middle and 10g of the quartz sand at the top;
firstly, nitrogen is injected into the combustion tank device at the speed of 2L/min, and then air is injected into the combustion tank device at the speed of 2L/min;
starting a heating furnace of the combustion pool device, and linearly heating the heating furnace to 600 ℃ according to the first heating rate condition, wherein the injection rate of the air is always unchanged;
by passing throughThe gas analyzer obtains the CO and the CO in the generated gas in the combustion pool 2 Thereby obtaining the CO and CO in the gas produced by the target thick oil combustion 2 Is added to the total amount of the product.
3. The method for predicting the heat release of thick oil combustion according to claim 2, wherein the process conditions adopted in the combustion of the normal paraffins with different carbon numbers in the step 2 by the combustion tank device are the same as those in the step 1.
4. A method for predicting the heat release of thick oil combustion according to any one of claims 1 to 3, wherein said n-alkanes of different carbon numbers are selected from the group consisting of n-dodecane, n-hexadecane, n-docosyl, n-octacosyl, n-tetratriacontane and n-tetratetracontane.
5. A method for predicting the heat release of thick oil combustion as claimed in any one of claims 1 to 3, wherein CO and CO 2 The step of the total generation amount of (a) includes:
measuring CO and CO in the gas produced by burning the thick oil or the normal alkane with different carbon numbers by a gas analyzer 2 Concentration profile of (2);
using the concentration change curve, calculating according to the following formula IV to obtain CO and CO 2 Is a total amount of the produced:
wherein the method comprises the steps ofRepresents CO and CO 2 Q represents the injection rate of air during combustion, +.>Represents CO and CO 2 Instantaneous timeConcentration values.
6. The method for predicting the heat release of thick oil combustion of claim 5, wherein said CO and CO in said thick oil combustion product gas are obtained 2 After the total amount of production of (2), the step 1 further includes the step of calculating the fuel utilization rate according to formula v:
FA represents fuel utilization, g is 2.
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| US20050082057A1 (en) * | 2003-10-17 | 2005-04-21 | Newton Donald E. | Recovery of heavy oils through in-situ combustion process |
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| CN101818637A (en) * | 2010-04-26 | 2010-09-01 | 胡士清 | Method for improving recovery rate of thick massive viscous oil reservoir by controlling burning gas injection speed |
| CN103499511A (en) * | 2013-10-16 | 2014-01-08 | 南京林业大学 | Asphalt combustion process predicting method based on multistage thermal analysis kinetics models |
| CN104060975A (en) * | 2014-06-24 | 2014-09-24 | 中国石油大学(北京) | Prediction method of activation energy in heavy oil combustion process |
| CN107575214A (en) * | 2016-07-04 | 2018-01-12 | 中国石油天然气股份有限公司 | The Forecasting Methodology of temperature and pressure in the pit shaft of process is adopted for noting |
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