CN108505980B - Underground energy utilization level evaluation method for water-flooding oil reservoir - Google Patents
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- 238000011156 evaluation Methods 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 238000002347 injection Methods 0.000 claims abstract description 77
- 239000007924 injection Substances 0.000 claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 45
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 235000019198 oils Nutrition 0.000 claims description 88
- 235000019476 oil-water mixture Nutrition 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 14
- 230000005484 gravity Effects 0.000 claims description 8
- 239000003129 oil well Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 22
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 239000013589 supplement Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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- 239000002332 oil field water Substances 0.000 description 1
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention belongs to the technical field of oil and gas development, and particularly relates to an underground energy utilization level evaluation method for water-flooding oil reservoirs. The method comprises the following steps: step 1, acquiring parameters of an oil production well, and calculating to obtain the energy of fluid produced by the oil production well within a certain time; step 2, acquiring parameters of a water injection well, and calculating to obtain energy supplemented by injected water within a certain time; step 3, acquiring oil reservoir parameters, and calculating elastic energy stored or released by the oil reservoir after water injection by using an integral method; and 4, calculating the underground energy utilization level of the water-flooding oil reservoir. The evaluation method of the invention determines the energy utilization level in the seepage process of the underground oil reservoir, can accurately grasp the energy consumption of the underground oil reservoir system and the utilization condition of the energy, and guides the oil field to save energy and reduce consumption.
Description
Technical Field
The invention belongs to the technical field of oil and gas development, and particularly relates to an underground energy utilization level evaluation method for water-flooding oil reservoirs.
Background
The oilfield flooding development refers to a process of supplementing stratum energy by artificial flooding in a flooding well, driving oil to the bottom of a production well through water, and lifting oil-water mixed liquid to the ground through an oil well lifting system. A large amount of energy is consumed in the water injection development process, and the cost directly influences the benefit of oil field development. The method has the advantages of improving the energy utilization level of the oil field, and playing a vital role in reducing the operation cost of the oil field and improving the economic benefit.
The process of oil field water injection development production mainly includes three sub-processes of water injection well injection, underground oil reservoir seepage and oil production well lifting. At present, the evaluation of the energy utilization level in the water injection development and production process only aims at two processes of water injection well injection and oil production well lifting, the evaluation method mainly calculates input and output energy and system efficiency through field test data, and the calculation method, the evaluation index and the evaluation method have mature standards and methods. However, for the seepage process of the underground oil reservoir which is used as a junction connecting the injection part of the water injection well and the lifting part of the oil production well, the input energy, the output energy, the energy lost in the seepage process, the overall energy utilization level and the like of the underground oil reservoir do not have a definite calculation and evaluation method.
In view of the above, the invention provides a method for evaluating the underground energy utilization level of a water-flooding oil reservoir, which comprises the steps of calculating the input, output and loss energy and the energy utilization level in the seepage process of the underground oil reservoir in the water-flooding development production process in two modes of artificial water-flooding development and elastic energy development according to test data, accurately grasping the energy consumption of an underground oil reservoir system and the utilization condition of the energy, helping enterprises to improve processes, equipment and management, excavating energy-saving potential and improving the economic effect of energy utilization.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for evaluating the underground energy utilization level of a water-flooding oil reservoir.
The object of the invention can be achieved by the following technical measures:
a method for evaluating the underground energy utilization level of a water-flooding oil reservoir is characterized in that the evaluation standard is the ratio of output energy to input energy, and the method mainly comprises the following steps:
step 3, acquiring the pressure and the volume of the oil-water mixture at different time and different positions in the oil reservoir, and calculating the elastic energy stored or released by the oil reservoir after water injection by using an integration method;
and 4, calculating the underground energy utilization level of the water-flooding oil reservoir.
The object of the invention can also be achieved by the following technical measures:
according to the method for evaluating the underground energy utilization level of the water-flooding oil reservoir, the fluid energy produced by the oil production well within a certain time in the step 1 comprises potential energy, pressure energy and kinetic energy, and the calculation formula is shown as the formula (I):
in the formula (I), Eo-the energy of the fluid produced by the production well over a certain time, J; rho1Density of oil-water mixture at bottom of oil well in kg/m3(ii) a g-acceleration of gravity, m/s2；z1-the height of the bottom of the production well relative to the reference surface, m; v1Volume of produced fluid m in a certain time at the bottom of the production well3；p1-production well bottom flow pressure, Pa; v is1-flow velocity of the oil-water mixture at the bottom of the production well, m/s; m is1The mass of produced fluid in kg at the bottom of the production well for a certain time.
The energy supplemented by water injection in a certain time in the step 2 comprises potential energy, pressure energy and kinetic energy, namely a calculation formula is shown as a formula (II):
in the formula (II), Ei-energy of water injection replenishment over a certain time, J; rho2Density of injected water, kg/m3(ii) a g-acceleration of gravity, m/s2；z2-height of the bottom of the injection well relative to the datum level, m; v2Volume of water injected in the bottom of the injection well in a given time, m3；p2-bottom hole flow pressure, Pa, of the injection well; v is2-flow rate of water injected at the bottom of the injection well, m/s; m is2-the mass of water injected into the bottom of the injection well in kg over a period of time.
And 3, storing or releasing elastic energy of the oil reservoir after water injection, wherein the elastic energy is the energy stored or released due to the elastic deformation of the object, and the oil, the water and the rock matrix in the oil reservoir are all micro-compressible and deform under the action of external force so as to store or release the elastic energy. The volume deformation of oil, water and rock matrix in the oil reservoir can be finally reflected as the volume change of fluid in the oil reservoir; when the volumes of oil and water are contracted, the pressure of the oil reservoir is increased, and energy is stored; when the volume of oil and water expands, the pressure of the oil deposit is reduced, energy is released, the elastic energy stored or released by the oil deposit after water injection is calculated according to the change of the volume and the pressure of fluid in the oil deposit, and the calculation formula is shown as a formula (III):
in the formula (iii), the water injection well is used as the origin of coordinates, x is 0, the time for starting water injection is used as the time starting point, and t is 0; integrating the oil reservoir range; eeElastic energy stored or released by the reservoir after waterflooding, J; p is a radical ofx,t-pressure in the reservoir at time t, location x, Pa; vx,0Fluid volume at time 0, position x in the reservoir, m3；Vx,tFluid volume at time t, position x, m in the reservoir3。
Calculating the underground energy utilization level of the water injection exploitation oil reservoir in the step 4, when artificial water injection is needed, regarding the process of artificial water injection energy supplement exploitation, regarding the oil reservoir as an integral system, the water injection well provides energy for the exploitation process, which is the energy input by the system, the energy produced by the oil production well is the energy output by the system, and the elastic energy stored in the oil reservoir is the energy changed by the system after energy loss, so that in the process, the elastic energy stored in the oil reservoir and the energy produced by the oil production well finally belong to the useful work of the process; therefore, for the development process of supplementing energy by artificial water injection, the sum of the energy produced by the oil production well and the elastic energy of the oil reservoir is divided by the energy supplemented by water injection, so that the system efficiency of the seepage process of the underground oil reservoir is the energy supplemented by artificial water injection, and the calculation formula is shown as the formula (IV):
the artificial water injection energy supplement is carried out, and in a special case, only water is injected, but oil is not extracted, namely, the water injection energy supplement is carried out, so that the formation pressure is continuously increased, at the moment, no energy is output in the system, and therefore, only the formation elastic energy is left for storage; in the system efficiency expression, the energy output by the oil production well is 0, and the formula (VI) is obtained through simplification:
and 4, calculating the underground energy utilization level of the water injection development oil reservoir, wherein when artificial water injection is not needed, the water injection supplemented energy within a certain time is 0, and the method belongs to elastic energy exploitation. The energy output by the oil production well is the energy output by the system, namely the useful work of the system; therefore, for the process of elastic energy exploitation of the oil reservoir, the system efficiency of the seepage process of the underground oil reservoir during the elastic energy exploitation is obtained by dividing the energy extracted by the oil well by the elastic energy of the oil reservoir, and the calculation formula is shown as the formula (v):
the invention has the following characteristics:
according to the method for evaluating the underground energy utilization level in the oil reservoir development process, the input energy (water injection supplemented energy), the output energy (oil production well produced energy), the energy stored or released by the oil reservoir and the system efficiency of energy consumption in the seepage process of the underground oil reservoir are measured and calculated according to the representation and conversion of the hydrodynamic energy, the energy utilization level in the seepage process of the underground oil reservoir is determined, the energy consumption of the underground oil reservoir system and the utilization condition of the energy can be accurately mastered, and the energy conservation and consumption reduction of an oil field are guided.
Drawings
FIG. 1 is a detailed flow chart of a method for evaluating the underground energy utilization level of a waterflood reservoir according to an embodiment of the present invention;
FIG. 2 is a graph of energy of fluid produced by a producing well, cumulative energy produced, versus time in an embodiment of the present invention;
FIG. 3 is a diagram showing the relationship between the energy of water injection replenishment and the accumulated replenishment and the time according to the embodiment of the present invention;
FIG. 4 is a plot of stored energy of a reservoir, cumulative stored energy, versus time for an embodiment of the present invention;
FIG. 5 is a graph of subsurface energy utilization, i.e., system efficiency versus time, for a waterflood reservoir in an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Examples
A numerical simulation method is used for establishing a one-injection one-production one-dimensional typical model only comprising one water injection well and one oil production well, the model comprises 11 grids, the size of each grid is 30m × 10m × 5m, the depth in an oil reservoir is 2000m, the porosity is 0.28, and the permeability is 1800 × 10-3um2The stratum viscosity is 24 mPa.s, the initial oil saturation is 0.7, the liquid extraction speed is 15%, and relevant oil reservoir parameters are measured and counted to explain the underground energy consumption characterization method in the oil reservoir development process; the method for evaluating the underground energy utilization level of the oil reservoir by water injection exploitation comprises the following steps: the steps are shown in figure 1:
in the formula (I), Eo-the energy of the fluid produced by the production well over a certain time, J; rho1Density of oil-water mixture at bottom of oil well in kg/m3(ii) a g-acceleration of gravity, m/s2；z1-the height of the bottom of the production well relative to the reference surface, m; v1Volume of produced fluid m in a certain time at the bottom of the production well3；p1-production well bottom flow pressure, Pa; v is1-flow velocity of the oil-water mixture at the bottom of the production well, m/s; m is1The mass of produced fluid in kg at the bottom of the production well for a certain time. After 90 days of flooding, the cumulative energy output for 90 days was calculated to be 1664578971J, i.e. 462.38Kw · h, and figure 2 gives the values for the energy output for the production well over a period of 1-86 days.
103, calculating the energy supplemented by the water injection well, obtaining the height of the bottom of the water injection well relative to a reference surface, wherein the reference surface is taken at the middle depth of the oil reservoir, namely the height is 0, the flow rate of the injected water at the bottom of the water injection well is 0.44m/s, the bottom flowing pressure is 20.85MPa, the volume (1.05m3/d, 94.5m3 in total) and the mass (94500kg) of the injected water in 90 days, and calculating the energy supplemented by the injected water in 90 days and the accumulated supplemented energy by the injected water by applying a formula (II), wherein the specific figure is shown in fig. 3;
in the formula (II), Ei-energy of water injection replenishment over a certain time, J; rho2Density of oil-water mixture at bottom of oil well in kg/m3(ii) a g-acceleration of gravity, m/s2；z2-the height of the bottom of the production well relative to the reference surface, m; v2Volume of water injected in the bottom of the injection well in a given time, m3；p2-bottom hole flow pressure, Pa, of the injection well; v is2-flow rate of water injected at the bottom of the injection well, m/s; m is2-the mass of water injected into the bottom of the injection well in kg over a period of time. The cumulative energy input for 90 days, i.e. the energy supplied to the injection well, is calculated to be 2419496408J, i.e. 672.1Kw · t, and figure 2 gives the values for the energy input for the injection well over a period of 1-86 days.
And 105, after stable water injection is carried out for 90 days, the average pressure of the oil reservoir rises by 10.2MPa, elastic energy is stored, and the oil reservoir stores the elastic energy in 9.5 directions of underground water storage by compressing the volume of fluid and increasing the volume of pores. The elastic energy accumulated for 90 days was calculated to be 237354520J, i.e., 65.9 Kw.t, using equation (III). Acquiring the pressure and the volume of an oil-water mixture at a position with time t and a position x in an oil reservoir, and calculating the elastic energy stored or released by the oil reservoir after water injection by using an integration method, wherein specific data of the oil reservoir in 1-86 days are shown in figure 4;
in the formula (iii), the water injection well is used as the origin of coordinates, x is 0, the time for starting water injection is used as the time starting point, and t is 0; integrating the oil reservoir range; eeElastic energy stored or released by the reservoir after waterflooding, J; p is a radical ofx,t-pressure in the reservoir at time t, location x, Pa; vx,0Fluid volume at time 0, position x in the reservoir, m3；Vx,tFluid volume at time t, position x, m in the reservoir3。
FIG. 1 is a graph of system efficiency versus time for the calculation of subsurface reservoir permeability at step 107, and FIG. 5 is a graph of system efficiency versus time;
the calculation formula is shown as formula (IV):
the average system efficiency is 78.6 percent after 90 days of accumulation of the oil reservoir in the underground seepage process of the oil reservoir is calculated by applying a formula (IV).
Claims (5)
1. A method for evaluating the underground energy utilization level of a water-flooding oil reservoir is characterized by comprising the following steps of:
step 1, acquiring the height of a well bottom of a production well relative to a reference surface, the density, the flow rate and the well bottom flowing pressure of an oil-water mixture at the well bottom of the production well, and the volume and the mass of produced liquid in a certain time, and calculating to obtain the fluid energy produced by the production well in a certain time;
step 2, acquiring the height of the bottom of the water injection well relative to a reference surface, the density of injected water, the flow rate and bottom flow pressure of the injected water at the bottom of the water injection well, and the volume and mass of the injected water in a certain time, and calculating to obtain the energy supplemented by the injected water in the certain time;
step 3, acquiring the pressure and the volume of the oil-water mixture at different time and different positions in the oil reservoir, and calculating the elastic energy stored or released by the oil reservoir after water injection by using an integration method;
step 4, calculating the underground energy utilization level of the water injection oil reservoir;
the calculation formula of the fluid energy produced by the oil production well within a certain time in the step 1 is shown as the formula (I):
in the formula (I), Eo-the energy of the fluid produced by the production well over a certain time, J; rho1Density of oil-water mixture at bottom of oil well in kg/m3(ii) a g-acceleration of gravity, m/s2；z1-the height of the bottom of the production well relative to the reference surface, m; v1Volume of produced fluid m in a certain time at the bottom of the production well3；p1-production well bottom flow pressure, Pa; v is1-flow velocity of the oil-water mixture at the bottom of the production well, m/s; m is1The mass of produced fluid in kg at the bottom of the production well for a certain time.
2. The method for evaluating the underground energy utilization level of a water-flooding oil reservoir as claimed in claim 1, wherein the calculation formula of the energy supplemented by water flooding for a certain period of time in step 2 is shown as formula (ii):
in the formula (II), Ei-energy of water injection replenishment over a certain time, J; rho2Density of injected water, kg/m3(ii) a g-acceleration of gravity, m/s2；z2-height of the bottom of the injection well relative to the datum level, m; v2Volume of water injected at the bottom of the injection well over a period of time，m3；p2-bottom hole flow pressure, Pa, of the injection well; v is2-flow rate of water injected at the bottom of the injection well, m/s; m is2-the mass of water injected into the bottom of the injection well in kg over a period of time.
3. The method for evaluating the underground energy utilization level of a water-flooding oil reservoir according to claim 1, wherein the calculation formula of the elastic energy stored or released by the oil reservoir after water flooding in the step 3 is shown as a formula (III):
in the formula (iii), the water injection well is used as the origin of coordinates, x is 0, the time for starting water injection is used as the time starting point, and t is 0; eeElastic energy stored or released by the reservoir after waterflooding, J; p is a radical ofx,t-pressure in the reservoir at time t, location x, Pa; vx,0Fluid volume at time 0, position x in the reservoir, m3；Vx,tFluid volume at time t, position x, m in the reservoir3。
4. The method for evaluating the underground energy utilization level of a water-flooding oil reservoir according to claim 1, wherein the underground energy utilization level of the water-flooding oil reservoir is calculated in step 4, and when artificial water flooding is required, the calculation formula is shown as formula (IV):
in the formula (IV): taking the water injection well as an origin of coordinates, setting x to be 0, setting the time for starting water injection as a time starting point, and setting t to be 0; p is a radical ofx,t-pressure in the reservoir at time t, location x, Pa; vx,0Fluid volume at time 0, position x in the reservoir, m3；Vx,tFluid volume at time t, position x, m in the reservoir3；ρ1-the density of the oil-water mixture at the bottom of the production well,kg/m3(ii) a g-acceleration of gravity, m/s2；z1-the height of the bottom of the production well relative to the reference surface, m; v1Volume of produced fluid m in a certain time at the bottom of the production well3；p1-production well bottom flow pressure, Pa; v is1-flow velocity of the oil-water mixture at the bottom of the production well, m/s; m is1-mass of produced fluid in kg at the bottom of the production well for a certain time; rho2Density of injected water, kg/m3；z2-height of the bottom of the injection well relative to the datum level, m; v2Volume of water injected in the bottom of the injection well in a given time, m3；p2-bottom hole flow pressure, Pa, of the injection well; v is2-flow rate of water injected at the bottom of the injection well, m/s; m is2-the mass of water injected into the bottom of the injection well in kg over a period of time.
5. The method of claim 1, wherein the underground energy utilization level of the waterflooding reservoir is calculated in step 4, and when artificial waterflooding is not required, the energy supplemented by waterflooding in a certain period of time is 0, and the calculation formula is represented by formula (v):
in formula (V): taking the water injection well as an origin of coordinates, setting x to be 0, setting the time for starting water injection as a time starting point, and setting t to be 0; p is a radical ofx,t-pressure in the reservoir at time t, location x, Pa; vx,0Fluid volume at time 0, position x in the reservoir, m3；Vx,tFluid volume at time t, position x, m in the reservoir3；ρ1Density of oil-water mixture at bottom of oil well in kg/m3(ii) a g-acceleration of gravity, m/s2；z1-the height of the bottom of the production well relative to the reference surface, m; v1Volume of produced fluid m in a certain time at the bottom of the production well3；p1-production well bottom flow pressure, Pa; v is1-flow velocity of the oil-water mixture at the bottom of the production well, m/s; m is1MiningThe mass of produced liquid in kg at the bottom of an oil well within a certain time.
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| CN106097120A (en) * | 2016-06-14 | 2016-11-09 | 西南石油大学 | A kind of determination method of water-drive pool natural water encroachment, water filling and exploitation poised state |
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