CN112083034A - Method and system for determining hydrocarbon generation amount of hydrocarbon source rock in-situ electric heating process - Google Patents
Method and system for determining hydrocarbon generation amount of hydrocarbon source rock in-situ electric heating process Download PDFInfo
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 260
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 255
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 250
- 239000011435 rock Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 112
- 238000005485 electric heating Methods 0.000 title claims abstract description 104
- 230000008569 process Effects 0.000 title claims abstract description 69
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 140
- 238000006243 chemical reaction Methods 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000004364 calculation method Methods 0.000 claims description 13
- 238000011234 economic evaluation Methods 0.000 claims description 12
- 239000010779 crude oil Substances 0.000 claims description 11
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 8
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- 238000009826 distribution Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000003079 shale oil Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000004058 oil shale Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention relates to a method and a system for determining hydrocarbon generation amount of a hydrocarbon source rock in an in-situ electric heating process. The method comprises the following steps: acquiring a temperature field of a hydrocarbon source rock in a single-well electrical heating process; determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process; determining the conversion rate of electrical heating hydrocarbon generation according to the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process; determining different electric heating areas; determining total hydrocarbon generation based on the electrically heated hydrocarbon generation conversion and the different electrically heated zones. The method can quickly and accurately determine the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process.
Description
Technical Field
The invention relates to the field of hydrocarbon generation amount calculation of hydrocarbon source rocks, in particular to a method and a system for determining the hydrocarbon generation amount of the hydrocarbon source rocks in an in-situ electric heating process.
Background
Although shale oil resources in China are very rich, effective exploration and development of shale oil still face serious challenges, and the main difficulty of exploration and development lies in the development technology. For oil shale with medium and high maturity, the former discovers that effective exploration and development can be realized by adopting a horizontal well-volume fracturing modification technology through exploration tests, and for the oil shale with medium and low maturity, the development technology underground in-situ mining is in an exploration stage at present, a larger technical research space is left from industrial exploration and recovery, and factors in the aspects of geology, engineering and the like play a decisive role in the industrial production of the in-situ mining technology.
In-situ electric heating adopts the technical scheme that an electric heater (such as a heating rod) is arranged in a heating well, continuous heat is provided for heating a target layer in a heat conduction mode, so that oil gas is generated in the target layer, and then the generated oil gas is conveyed to the ground by using a production well. The specific process is that a series of freezing wells are built around a heating area, low-temperature nitrogen is injected to form a freezing wall, so that surrounding underground water is mainly prevented from entering a mining area and oil gas generated by pyrolysis is prevented from running off, the underground water in the heating area is pumped out after the freezing wall is built, the heat loss of the underground water in the heat conduction process is reduced, the pollution of the generated oil gas to the underground water is avoided, a target layer is heated through the heating wells, the target layer is heated for a period of time to be pyrolyzed to generate oil, and then the oil is mined through a production well. For in situ electrical heating, the space, time and various parameter variations involved in the actual heating and production process are complex.
Disclosure of Invention
The invention aims to provide a method and a system for determining hydrocarbon generation amount of a hydrocarbon source rock in an in-situ electric heating process, which can quickly and accurately determine the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process.
In order to achieve the purpose, the invention provides the following scheme:
a method for determining the hydrocarbon production amount of a hydrocarbon source rock in an in-situ electric heating process, comprising:
acquiring a temperature field of a hydrocarbon source rock in a single-well electrical heating process;
determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process;
determining the conversion rate of electrical heating hydrocarbon generation according to the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process;
determining different electric heating areas;
determining a total hydrocarbon generation amount according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones.
Optionally, the determining the conversion rate of the electrical heating to generate hydrocarbons according to the temperature field of the source rock in the single-well electrical heating process and the temperature field of the source rock in the multi-well electrical heating process specifically includes:
acquiring hydrocarbon generation kinetic parameters of a hydrocarbon source rock;
and determining the conversion rate of the electrical heating hydrocarbon generation according to the hydrocarbon source rock hydrocarbon generation kinetic parameters, the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process.
Optionally, the determining the total hydrocarbon generation amount according to the conversion rate of the electrically heated hydrocarbon generation and the different electrically heated zones specifically includes:
determining the total hydrocarbon generation amount according to the conversion rate of the electrical heating hydrocarbon generation and the different electrical heating areas by adopting a formula Q ═ S.H.rho.TOC.HI.X;
wherein Q is hydrocarbon amount, S is hydrocarbon source rock area, H is hydrocarbon source rock thickness, rho is hydrocarbon source rock density, TOC is organic carbon content, HI is hydrogen index, and X is hydrocarbon conversion rate.
Optionally, the method further comprises:
and according to the total hydrocarbon generation amount, carrying out economic evaluation on crude oil production by electric heating.
A system for determining the amount of hydrocarbons produced from a hydrocarbon source rock during in situ electrical heating, comprising:
the single-well electric heating temperature field acquisition module is used for acquiring a temperature field of the hydrocarbon source rock in the single-well electric heating process;
the multi-well electric heating temperature field acquisition module is used for determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process;
the electric heating hydrocarbon generation conversion rate determination module is used for determining the electric heating hydrocarbon generation conversion rate according to the temperature field of the hydrocarbon source rock in the single-well electric heating process and the temperature field of the hydrocarbon source rock in the multi-well electric heating process;
the electric heating area volume determining module is used for determining different electric heating areas;
and the total hydrocarbon generation amount determination module is used for determining the total hydrocarbon generation amount according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones.
Optionally, the electrically heated hydrocarbon conversion determining module specifically includes:
the hydrocarbon generation kinetic parameter acquisition unit is used for acquiring hydrocarbon generation kinetic parameters of the hydrocarbon source rock;
and the electric heating hydrocarbon generation conversion rate calculation unit is used for determining the electric heating hydrocarbon generation conversion rate according to the hydrocarbon source rock hydrocarbon generation kinetic parameters, the temperature field of the hydrocarbon source rock in the single-well electric heating process and the temperature field of the hydrocarbon source rock in the multi-well electric heating process.
Optionally, the total hydrocarbon production determination module specifically includes:
a total hydrocarbon generation amount determination unit for determining a total hydrocarbon generation amount by using a formula Q ═ S · H · ρ · TOC · HI · X according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones;
wherein Q is hydrocarbon amount, S is hydrocarbon source rock area, H is hydrocarbon source rock thickness, rho is hydrocarbon source rock density, TOC is organic carbon content, HI is hydrogen index, and X is hydrocarbon conversion rate.
Optionally, the method further comprises:
and the crude oil production economic evaluation module is used for carrying out electrical heating crude oil production economic evaluation according to the total hydrocarbon production amount.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a method and a system for determining hydrocarbon generation amount of a hydrocarbon source rock in an in-situ electric heating process. The method comprises the following steps: acquiring a temperature field of a hydrocarbon source rock in a single-well electrical heating process; determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process; determining the conversion rate of electrical heating hydrocarbon generation according to the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process; determining different electric heating areas; determining total hydrocarbon generation based on the electrically heated hydrocarbon generation conversion and the different electrically heated zones. The method can quickly and accurately determine the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for determining the hydrocarbon production of a hydrocarbon source rock during in situ electrical heating according to the present invention;
FIG. 2 is a schematic diagram of a single well in-situ electrical heating physical model;
FIG. 3 is a schematic of the cross-sectional temperature profile of the blanket at a heating rod temperature of 700 ℃;
FIG. 4 is a cross-sectional view of two wells as they are heated;
FIG. 5 is a contour plot of a multi-well electrical heating mode temperature distribution;
FIG. 6 is a plan view of conversion as a function of time for a single well heater bar temperature of 700 deg.C;
FIG. 7 is a graph of heating time versus economic evaluation at a heating rod temperature of 700 ℃.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for determining hydrocarbon generation amount of a hydrocarbon source rock in an in-situ electric heating process, which can quickly and accurately determine the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
To estimate the actual situation, the numerical simulation of the temperature field is an effective method, and the method has the advantages of solving the complex problem which cannot be solved by theoretical research, having less required cost and time compared with experiments, and being of great help to the design of the field in-situ conversion mining scheme.
FIG. 1 is a flow chart of a method for determining the hydrocarbon production of a hydrocarbon source rock in an in-situ electric heating process according to the present invention. As shown in fig. 1, a method for determining the hydrocarbon generation amount of a hydrocarbon source rock in an in-situ electric heating process comprises the following steps:
step 101: and acquiring the temperature field of the hydrocarbon source rock in the single-well electric heating process.
Firstly, the temperature field of the hydrocarbon source rock in the single-well electric heating process is calculated, the temperature field can reflect the temperature condition of the hydrocarbon source rock layer at any position and any time, and the method is an important basis for calculating the hydrocarbon generation quantity of the hydrocarbon source rock. The single-well in-situ electric heating calculation model is shown in fig. 2, wherein a heating rod is placed in a heating well, the radius of a heating area is R, and the height is h. The single-well in-situ electric heating process has symmetry, the symmetry axis is a heating well, the temperatures of all points of the heating well in the longitudinal direction are the same, and mainly the heat conduction in the transverse direction is realized, so that the temperature field distribution in the longitudinal direction is uniform, the temperatures on circular ring surfaces formed by the same radius are the same, the temperature change situation on each circular ring surface can be researched according to the change situation of one cross section (a circular shaded part in figure 2) of a cylinder, and the temperature change situation of the cross section can be regarded as the heat conduction problem of an infinite flat plate in the heat conduction technology.
a＝λ/ρc (2)
t＝0，T＝T0 (3)
In the formula (1), a is the thermal diffusivity of the heating target layer, m2S; the formula (2) can calculate the thermal diffusivity a, wherein lambda is the thermal conductivity of the heating target layer, and W/(m.K); c is the specific heat capacity of the heating target layer, J/(kg. K); rho is the density of the heating target layer, kg/m3(ii) a T is the temperature of the heating rod, DEG C; x is the vertical distance, m, from the point to the heating well; h is the heat convection coefficient of the heating rod and the target layer.
Assuming that the heat conduction of the heating rod is initiated from the wall surface of the heating well, the temperature of the heating rod is set to 700 ℃ (if the temperature of the heating rod is too high, the heating rod will be carbonized and coked due to high temperature in the area near the heating well, and thus a certain damage layer will be generated on the arrangement inside the heating well). Assuming an in-situ layer temperature of 30 ℃, a heating rod length and a thickness of a layer to be heated are the same, h is 0.4, lambda is 2.5W/(m.K), and rho is 2.5X 103kg/m3And C is 2000J/(kg. K). FIG. 3 is a schematic of the cross-sectional temperature profile of the blanket at a heating rod temperature of 700 ℃.
Step 102: and determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process.
And calculating the temperature field distribution of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field distribution in the single-well heating process calculated in the step 101. The research on the temperature field of the multiple electric heating wells is based on the electric heating temperature field of a single well. During the heating process of a single well, in the separation processThe temperature on the circular ring formed by the thermal centers at the same distance is the same. According to the principle of thermal superposition, the heat energy generated when the two heating wells heat the target layer can be superposed with each other. Fig. 3 shows a cross section of two wells heating, O, P for each well, for any point N in the heating range of the two wells, the thermal energy is the superposition of the heat transferred to that point by the heating wells O and P. Since the heat flux is a function of the temperature difference Δ T, the temperature difference Δ T at point N is the same for both heater wells under otherwise identical conditions (formation, heating, etc.)N＝ΔTO+ΔTPTherefore, the temperature of any point in the heating range of the in-situ multiple electric heating wells is the superposition of the temperatures of the heating wells at the point. FIG. 4 is a cross-sectional view of two wells during heating.
The single-well temperature simulation is realized according to grid division, a series of data points with the same interval are obtained, interpolation fitting is carried out on the data points, a fitting function of single-well temperature change can be obtained, and multi-well temperature superposition can be carried out according to the fitting function. For interpolation fitting of curves, the more mature methods include Lagrange polynomial interpolation, Hermite polynomial interpolation, cubic spline interpolation and the like. The Lagrange polynomial interpolation method has a complex calculation process of a fitting function, the basis function needs to be calculated again every time a node is added, and the result of high-order interpolation is not converged and is not stable; the Hermite interpolation polynomial can overcome the defects that an interpolation function is not smooth and cannot be led at a node, but not only derivative values at the node are required to be equal, but also high-order derivatives are required to be equal in the calculation process, and the condition is too high.
First, if the piecewise function z (x) is a cubic spline, three conditions need to be met:
(1) z (x) has continuous first and second derivatives in the [ n, m ] interval;
(2) in any one of the cells [ x ]i，xi+1]Above, Z (x) are all 3 rd order polynomials;
(3)Z(x)＝yi(i-0, 1, …, j) indicates that the function represents all points on the curve.
Then, the interval is set to [ n, m ]]There is one partition t: n ═ x0＜x1＜，…，＜xj-1＜xjIf y ═ mi＝f(xi) (i ═ 0, 1, …, j), and Z (x)i)＝yi(i is 0, 1, …, j), Z (x) is defined asi) A cubic spline interpolation function called f (x), the interpolation point being (x)i，f(xi)). And fitting the curve by adopting a cubic spline interpolation method, wherein the smaller the distance between interpolation points is, the closer the interpolation curve is to the real curve, and the smoothness and the shape retention are better. The temperature of the single well is electrically heated, so that a plurality of data points are obtained through simulation, namely a plurality of sample points are obtained, and the smoothness of an interpolation curve can be good by adopting a cubic spline interpolation method to perform curve fitting on the data points, so that the cubic spline interpolation method is adopted in the curve fitting.
FIG. 5 is a multi-well electrical heating mode temperature distribution contour map, in which (a), (b) and (c) are two-well, three-well and four-well electrical heating mode temperature distribution contour maps at a heating rod temperature of 600 ℃ and a well spacing of 24m, respectively.
Step 103: determining the conversion rate of the electrical heating hydrocarbon generation according to the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process, and specifically comprises the following steps:
and acquiring hydrocarbon generation kinetic parameters of the hydrocarbon source rock.
And determining the conversion rate of the electrical heating hydrocarbon generation according to the hydrocarbon source rock hydrocarbon generation kinetic parameters, the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process.
The calculation of the step adopts a hydrocarbon generation kinetics method, the core principle of the method is a time-temperature complementary effect expressed by an Arrhenius equation, namely, the hydrocarbon generation process of the hydrocarbon source rock is taken as a plurality of chemical reactions which are connected in series or in parallel, the hydrocarbon generation kinetics related parameters of the hydrocarbon source rock are obtained through an indoor rapid temperature rise experiment, and the parameters are used for calculating the hydrocarbon generation conversion rate in the slow temperature rise process under the geological condition, so that an important basis is provided for researching the oil gas generation temperature and time. For in-situ electric heating, the process is similar to the simulation of the hydrocarbon generation dynamics in a laboratory, so the hydrocarbon generation conversion rate in the in-situ conversion process can be calculated through the hydrocarbon generation dynamics, and the conversion rate of in-situ conversion can be calculated by combining hydrocarbon generation dynamics parameters and the temperature field simulation data of in-situ electric heating, so that a basis is provided for in-situ conversion of shale oil. If the kerogen component in the oil shale is single, the process of cracking the kerogen in the oil shale due to the action of temperature can be represented by the following equation.
In the formula, x is the kerogen conversion rate,%; t is the reaction time, s; a is a pre-exponential factor; e is apparent activation energy; r is a gas constant; t is temperature, DEG C, and is temperature data obtained by in-situ electric heating simulation.
The hydrocarbon source rock hydrocarbon generation kinetic parameters calculated at this time adopt related parameters of 1 well in the green section of the northern part of the Songliao basin, and the specific gravity of the oily kerogen is 0.8. According to the simulation result, the temperature of the heating area changes along with the time, and the conversion rate of each point of the heating area in different heating years can be calculated by combining the kinetic parameters (as shown in figure 6). FIG. 6 is a plan view of conversion as a function of time for a single well heater bar temperature of 700 ℃.
Step 104: different electrically heated zones are defined.
The heating area of the single-well in-situ electric heating is a cylinder, the heating area is divided into a plurality of small cylindrical rings equally along the radial direction, the radial length of each cylindrical ring is delta x (wherein, the layer closest to the heating rod is the cylinder, the radius is delta x), and the delta x is 0.3 m. The volume of each layer of cylindrical rings is calculated by the following formula:
V1＝S·H＝πHΔx2 (6)
Vn(n＞1)＝πH(nΔx)2-πH[(n-1)Δx]2 (7)
in the formula, VnIs the volume of the region, m3(ii) a H is the height of the calculation area, m; s is the area of the calculation region, m2。
The volume of each region can be calculated by adopting a dividing method which is the same as the conversion rate, dividing the heating region into a plurality of small regions at intervals of 5 ℃, firstly fitting the temperature distribution isotherm, adopting a cubic equation as a curve fitting formula, obtaining a curve formula corresponding to each isotherm of the heating region by fitting, then integrating the obtained fitting formula, and accumulating each divided region to calculate the whole volume.
Vn＝S(Tn+1)-S(Tn) (9)
Wherein R isTnAt a temperature of TnThe time isotherm is obtained by fitting the temperature field data of step 2, S (T)n) At a temperature of TnVolume enclosed by isotherms, m3；VnAt a temperature of TnThe volume of the region.
Step 105: determining the total hydrocarbon generation amount according to the conversion rate of the electrical heating hydrocarbon generation and the different electrical heating areas, and specifically comprising the following steps:
determining the total hydrocarbon generation amount according to the conversion rate of the electrical heating hydrocarbon generation and the different electrical heating areas by adopting a formula Q ═ S.H.rho.TOC.HI.X;
in the formula: q is the amount of hydrocarbon (oil, 10)8t; qi, 108m3) (ii) a S is the area of the source rock, km2(ii) a H is the thickness of the hydrocarbon source rock, km; rho is the density of the source rock, t/km3(ii) a TOC is organic carbon content,%; HI is hydrogen index, mg/g; x is hydrocarbon conversion,%.
The in-situ electrical heating hydrocarbon generation amount is calculated by a cause method, firstly, grids of the stratum are divided respectively, then corresponding parameters of organic carbon (TOC), Hydrogen Index (HI), hydrocarbon generation conversion rate (X), heating stratum thickness (H) and stratum density (rho) are distributed to each divided grid, and finally, the resource abundance of each unit is summed through calculus so as to obtain the resource generation amount.
Q＝S·H·ρ·TOC·HI·X (8)
Step 101-. To estimate the actual situation, the numerical simulation of the temperature field is an effective method, and the method has the advantages of solving the complex problem which cannot be solved by theoretical research, having less required cost and time compared with experiments, and being of great help to the design of the field in-situ conversion mining scheme.
Step 103-. In China, due to the fact that the exploration degree of shale oil and gas is low, experimental data of all regions are not detailed, and therefore the analogy method and the statistical method are not suitable for resource evaluation of shale oil and gas. Compared with the analogy method and the statistical method, the cause method is used for evaluating the resource amount of a research area through the hydrocarbon generation and discharge amount, the adopted calculation data is obtained through actual geochemical analysis, the data is real and reliable, and the method is a more basic and important resource amount evaluation method for the area with low exploration degree.
In addition to the steps 101-105, the present invention further comprises:
step 106: and according to the total hydrocarbon generation amount, carrying out economic evaluation on crude oil production by electric heating.
The economic evaluation of the in-situ electric heating is mainly divided into two parts of calculation, namely gain and cost. Revenue refers to sales of the amount of hydrocarbons generated by the heating zone; the cost mainly calculates the cost of electric heating and the cost of well drilling.
I＝Q×P×η (9)
In the formula, I is income in ten thousand yuan; q is the total amount of the hydrocarbon, 104t; eta is recovery ratio, eta is 62%; p is the sales price per unit of hydrocarbon production, dollars/t.
TC＝Pi×n+E×PE×10-4 (10)
Wherein TC isTotal cost, ten thousand yuan; pi is the cost of a single well, ten thousand yuan, and is 100; n is the number of the heating wells; e is power consumption, kW.h; pEThe power charge is yuan/kW.h;
the profit M, ten thousand yuan can be obtained by subtracting equation (10) from equation (9):
M＝I-TC (11)
in the process of heating the heating area by using the heating rod, there are heat losses due to various factors, so it is necessary to make assumptions about the heating process in calculating the benefit. It is assumed that during the heating process, the electric power of the heating rod is completely converted into the heat required for heating to raise the temperature of the heating zone. For volume VnAt t, ati-tjThe temperature of the heating area is increased from ti-tjThe heat absorbed by the heating zone during the time period is:
wherein c is specific heat capacity, and c is 2000J/(kg.K); rho is density, and is 2500 kg/(m)3)；VnVolume of the heated region, m3(ii) a The temperatures corresponding to the heating zones at the heating times i and j, respectively, are denoted by K.
For a cylindrical area with a radius of 12m and a height of 50m, a relevant economic benefit evaluation was performed according to the mathematical model of economic evaluation when the heating rod temperature was 700 deg.c (fig. 7). The electric charge is discussed according to two conditions, namely industrial electricity, and the electric charge is 0.75 yuan/kW.h; and secondly, wind power generation is carried out, and the electric charge is 0.2 yuan/kW.h. And calculated for $ 50, $ 65, and $ 80 per barrel of crude oil, the results of the calculation are shown in fig. 7. As can be seen from the figure, when the temperature of the heating rod is 700 ℃, the cost is higher than the benefit for both power utilization modes, and the heating rod is in a loss state; as heating progresses, costs rise linearly, and income tends to stabilize by the ninth year as the hydrocarbons are nearly complete, at which time losses 560, 454, 350 ten thousand yuan are lost for wind power generation when crude oil prices are $ 50, $ 65, and $ 80 per barrel.
Corresponding to the method for determining the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process, the invention also provides a system for determining the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process, which comprises the following steps:
and the single-well electric heating temperature field acquisition module is used for acquiring the temperature field of the hydrocarbon source rock in the single-well electric heating process.
And the multi-well electric heating temperature field acquisition module is used for determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process.
And the electrical heating hydrocarbon generation conversion rate determination module is used for determining the electrical heating hydrocarbon generation conversion rate according to the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process.
And the electric heating area volume determining module is used for determining different electric heating areas.
And the total hydrocarbon generation amount determination module is used for determining the total hydrocarbon generation amount according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones.
The module for determining conversion rate of hydrocarbon generation through electric heating specifically comprises:
and the hydrocarbon generation kinetic parameter acquisition unit is used for acquiring hydrocarbon generation kinetic parameters of the hydrocarbon source rock.
And the electric heating hydrocarbon generation conversion rate calculation unit is used for determining the electric heating hydrocarbon generation conversion rate according to the hydrocarbon source rock hydrocarbon generation kinetic parameters, the temperature field of the hydrocarbon source rock in the single-well electric heating process and the temperature field of the hydrocarbon source rock in the multi-well electric heating process.
The total hydrocarbon generation amount determination module specifically includes:
and a total hydrocarbon generation amount determining unit for determining the total hydrocarbon generation amount according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones by adopting a formula Q ═ S · H · ρ · TOC · HI · X.
Wherein Q is hydrocarbon amount, S is hydrocarbon source rock area, H is hydrocarbon source rock thickness, rho is hydrocarbon source rock density, TOC is organic carbon content, HI is hydrogen index, and X is conversion rate.
The hydrocarbon generation amount determining system for the hydrocarbon source rock in the in-situ electric heating process further comprises:
and the crude oil production economic evaluation module is used for carrying out electrical heating crude oil production economic evaluation according to the total hydrocarbon production amount.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A method for determining the hydrocarbon generation amount of a hydrocarbon source rock in an in-situ electric heating process, which is characterized by comprising the following steps:
acquiring a temperature field of a hydrocarbon source rock in a single-well electrical heating process;
determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process;
determining the conversion rate of electrical heating hydrocarbon generation according to the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process;
determining different electric heating areas;
determining a total hydrocarbon generation amount according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones.
2. The method for determining the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process as claimed in claim 1, wherein the determining the conversion rate of the electric heating hydrocarbon generation according to the temperature field of the hydrocarbon source rock in the single-well electric heating process and the temperature field of the hydrocarbon source rock in the multi-well electric heating process specifically comprises:
acquiring hydrocarbon generation kinetic parameters of a hydrocarbon source rock;
and determining the conversion rate of the electrical heating hydrocarbon generation according to the hydrocarbon source rock hydrocarbon generation kinetic parameters, the temperature field of the hydrocarbon source rock in the single-well electrical heating process and the temperature field of the hydrocarbon source rock in the multi-well electrical heating process.
3. The method for determining hydrocarbon generation amount of hydrocarbon source rock in the in-situ electric heating process according to claim 1, wherein the determining of the total hydrocarbon generation amount according to the electric heating hydrocarbon generation conversion rate and the different electric heating zones specifically comprises:
determining the total hydrocarbon generation amount according to the conversion rate of the electrical heating hydrocarbon generation and the different electrical heating areas by adopting a formula Q ═ S.H.rho.TOC.HI.X;
wherein Q is hydrocarbon amount, S is hydrocarbon source rock area, H is hydrocarbon source rock thickness, rho is hydrocarbon source rock density, TOC is organic carbon content, HI is hydrogen index, and X is hydrocarbon conversion rate.
4. The method for determining the hydrocarbon generation amount of the hydrocarbon source rock in the in-situ electric heating process according to claim 1, further comprising:
and according to the total hydrocarbon generation amount, carrying out economic evaluation on crude oil production by electric heating.
5. A system for determining the amount of hydrocarbons produced from a hydrocarbon source rock during in situ electrical heating, comprising:
the single-well electric heating temperature field acquisition module is used for acquiring a temperature field of the hydrocarbon source rock in the single-well electric heating process;
the multi-well electric heating temperature field acquisition module is used for determining the temperature field of the hydrocarbon source rock in the multi-well electric heating process according to the temperature field of the hydrocarbon source rock in the single-well electric heating process;
the electric heating hydrocarbon generation conversion rate determination module is used for determining the electric heating hydrocarbon generation conversion rate according to the temperature field of the hydrocarbon source rock in the single-well electric heating process and the temperature field of the hydrocarbon source rock in the multi-well electric heating process;
the electric heating area volume determining module is used for determining different electric heating areas;
and the total hydrocarbon generation amount determination module is used for determining the total hydrocarbon generation amount according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones.
6. The system for determining hydrocarbon generation amount of hydrocarbon source rock in the in-situ electric heating process according to claim 5, wherein the module for determining hydrocarbon generation conversion rate by electric heating specifically comprises:
the hydrocarbon generation kinetic parameter acquisition unit is used for acquiring hydrocarbon generation kinetic parameters of the hydrocarbon source rock;
and the electric heating hydrocarbon generation conversion rate calculation unit is used for determining the electric heating hydrocarbon generation conversion rate according to the hydrocarbon source rock hydrocarbon generation kinetic parameters, the temperature field of the hydrocarbon source rock in the single-well electric heating process and the temperature field of the hydrocarbon source rock in the multi-well electric heating process.
7. The system for determining hydrocarbon generation amount of hydrocarbon source rock in the in-situ electric heating process according to claim 5, wherein the total hydrocarbon generation amount determination module specifically comprises:
a total hydrocarbon generation amount determination unit for determining a total hydrocarbon generation amount by using a formula Q ═ S · H · ρ · TOC · HI · X according to the electrical heating hydrocarbon generation conversion rate and the different electrical heating zones;
wherein Q is hydrocarbon amount, S is hydrocarbon source rock area, H is hydrocarbon source rock thickness, rho is hydrocarbon source rock density, TOC is organic carbon content, HI is hydrogen index, and X is hydrocarbon conversion rate.
8. The system for determining the hydrocarbon generation amount of a hydrocarbon source rock in an in situ electric heating process according to claim 5, further comprising:
and the crude oil production economic evaluation module is used for carrying out electrical heating crude oil production economic evaluation according to the total hydrocarbon production amount.
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