CN114198073A - Method for improving recovery efficiency of steam huff and puff steam channeling horizontal well - Google Patents
Method for improving recovery efficiency of steam huff and puff steam channeling horizontal well Download PDFInfo
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- 230000005465 channeling Effects 0.000 title claims abstract description 100
- 238000011084 recovery Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 claims abstract description 47
- 238000011161 development Methods 0.000 claims abstract description 22
- 230000008901 benefit Effects 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 239000003921 oil Substances 0.000 claims description 61
- 239000003129 oil well Substances 0.000 claims description 18
- 230000035699 permeability Effects 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000010779 crude oil Substances 0.000 claims description 10
- 230000001186 cumulative effect Effects 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 239000000295 fuel oil Substances 0.000 claims description 7
- 230000000704 physical effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000013178 mathematical model Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010795 Steam Flooding Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000638 stimulation Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention provides a method for improving recovery efficiency of a steam-stimulated steam channeling horizontal well, which comprises the following steps: step 1, acquiring oil deposit geological parameters and historical production data of a target well; step 2, establishing an oil reservoir geological model according to the oil reservoir geological basic parameters of the target well; step 3, fitting the production history, and correcting the oil reservoir geological model; step 4, simulating the changes of temperature fields, pressure fields and saturation fields in different periods by numerical values; step 5, calculating a steam channeling factor according to the simulation result; step 6, performing numerical simulation to determine a steam injection well; and 7, performing numerical simulation to determine the steam injection amount and ensure the maximum benefit. The steam huff and puff steam channeling horizontal well recovery efficiency improving method can be used for simultaneously opening a plurality of wells for production, reducing the steam consumption, ensuring the production effect, improving the steam huff and puff steam channeling horizontal well recovery efficiency and improving the development benefit.
Description
Technical Field
The invention relates to the technical field of heavy oil reservoir development, in particular to a method for improving recovery efficiency of a steam-stimulated steam channeling horizontal well.
Background
At present, heavy oil reservoirs are generally exploited in a steam stimulation mode. The steam stimulation is to inject a certain amount of steam into the oil well, close the oil well for a period of time, and open the oil well for exploitation after the heat energy of the steam diffuses to the oil layer and the crude oil fluidity of the heavy oil reservoir becomes strong.
After multiple steam huff and puff, the steam is influenced by factors such as well spacing, a reservoir high-permeability channel, steam injection quantity and the like, a mutually communicated temperature field is formed among wells, the steam utilization rate is greatly reduced, and the production effect is worsened along with the steam utilization rate. In order to reduce the influence of steam channeling, the Liaohe oil field is provided by Zhang Yong in research and application discussion of comprehensive treatment technology of super-thick oil steam channeling, the steam injection pressure is controlled not to exceed the rupture pressure by controlling the steam injection speed and the steam injection strength in the initial development stage, otherwise, the super-thick oil steam channeling is easier to occur; liu Xian Qing is proposed in the research on ultra-thick oil huff and puff block steam channeling treatment strategies, and the combined huff and puff is implemented at the initial stage of steam channeling according to various modes such as plane combination, medium combination, layer combination and the like, so that the temperature field and the pressure field are balanced, the influence of steam channeling is relieved, and the development effect is improved; the Zhai inspired on the Shu thesis "Zheng 411 blocks of ultra-thick oil thermal recovery anti-steam channeling technical research and application" proposes that the superior channel is blocked by a high temperature resistant multiphase composite blocking and adjusting system in the later stage of steam channeling, so that the periodic development effect can be effectively improved.
At present, several treatment modes of the steam channeling well have large defects, and after the steam injection speed and the steam injection strength are controlled in the initial stage of exploitation, the swept radius is small, the oil yield of an oil well is low, and the development benefit is poor; the combined huff and puff at the initial stage of steam channeling needs synchronous steam injection of a steam channeling well group, and has higher requirements on a steam injection boiler and ground operation; the method has the advantages of complex process, high investment cost, short validity period and poor development benefit. In addition, the purpose of the above process technologies is to control steam channeling and slow down the influence of steam channeling, and a method for improving the heat utilization rate by utilizing a steam channeling channel so as to improve the recovery ratio of a steam channeling horizontal well through steam stimulation and increase the development benefit is urgently needed at present.
In the application No.: CN201610620741.9, which is a chinese patent application, relates to a method for increasing recovery efficiency by determining a horizontal well steam flooding pattern, the method for increasing recovery efficiency by determining a horizontal well steam flooding pattern comprises: step 1, selecting physical property parameters of a horizontal well steam flooding oil layer; step 2, optimizing and deploying a horizontal well; step 3, adopting an HDCS or HDNS mode to steam for huff and puff before driving; step 4, determining the steam flooding well pattern form of the horizontal well; step 5, determining the steam driving and rotating driving time; and 6, determining other parameters of the steam flooding, and carrying out steam flooding development. In the application No.: CN201610619133.6 relates to a method for improving the recovery ratio of an ultra-heavy oil reservoir by horizontal well steam flooding, which comprises the following steps: step 1, collecting basic data of a research block, and screening a test target area; step 2, optimizing and calculating basic parameters of horizontal well design geology and injection-production parameters of a horizontal well steam throughput stage; step 3, optimizing the form of the steam flooding well pattern, and planning and deploying the steam flooding well pattern; step 4, optimizing the steam flooding opportunity and the injection and production parameters of the horizontal well steam flooding stage; and 5, predicting the steam flooding development effect of the horizontal well, and determining the final recovery ratio of steam huff and puff of the horizontal well to steam flooding development.
At present, the steam flooding technology is mainly applied to a straight inclined well block, a horizontal well implements steam flooding, steam channeling easily occurs, an oil well is difficult to manage after steam is generated, and the steam flooding technology is rarely applied to the horizontal well block in China at present.
Therefore, a novel method for improving the recovery efficiency of the steam-stimulated steam channeling horizontal well is invented, and the technical problems are solved.
Disclosure of Invention
The invention aims to provide a method for improving the recovery efficiency of a steam huff-and-puff steam channeling horizontal well, which can improve the recovery efficiency of the steam huff-and-puff steam channeling horizontal well and improve the development benefit.
The object of the invention can be achieved by the following technical measures: the method for improving the recovery efficiency of the steam huff-puff steam channeling horizontal well comprises the following steps: step 1, acquiring oil deposit geological parameters and historical production data of a target well; step 2, establishing an oil reservoir geological model according to the oil reservoir geological basic parameters of the target well; step 3, fitting the production history, and correcting the oil reservoir geological model; step 4, simulating the changes of temperature fields, pressure fields and saturation fields in different periods by numerical values; step 5, calculating a steam channeling factor according to the simulation result; step 6, performing numerical simulation to determine a steam injection well; and 7, performing numerical simulation to determine the steam injection amount and ensure the maximum benefit.
The object of the invention can also be achieved by the following technical measures:
in the step 1, acquiring oil reservoir geological basic parameters of oil saturation, permeability, crude oil viscosity, oil reservoir temperature and pressure of a target well; daily fluid, daily oil, water content, cumulative oil production, cumulative water production, and cumulative fluid production of the target well.
In the step 2, grids and step lengths are divided according to the oil deposit thickness and the control area of the target well, and an oil deposit geological model is built according to oil deposit geological basic parameters such as viscosity temperature, permeability, oil saturation, an oil-water interface and rock fluid physical properties.
In step 3, a mathematical model is operated according to actual steam injection data and production data of the target well, the oil yield, the water yield and the water content of the well are simulated through calculation and are compared with the actual data, historical fitting is carried out, the data of relative permeability are adjusted according to a fitting result, the model is corrected, the error is controlled within 1.0%, and the accuracy of the model is guaranteed.
In step 4, on the basis of the established oil reservoir geological model, temperature fields, pressure fields and saturation fields of the oil well in different periods are simulated through numerical simulation, and a steam channeling well group and a steam channeling channel are determined.
In step 5, the steam channeling channel is a high-temperature, low-viscosity and high-speed flowing area in the heavy oil thermal recovery process, namely the physical property change range of a reservoir in the steam channeling channel is large; based on the characteristics, the evaluation index of the steam channeling channel is established:
in the formula: f is a steam channeling factor;
t is reservoir temperature; t is0-reservoir initial temperature;
p is reservoir pressure; p0-reservoir initial pressure;
So-reservoir crude oil saturation; so0-reservoir initial crude oil saturation;
phi-reservoir porosity; phi0-reservoir initial porosity;
k is the permeability of the reservoir; k0-initial permeability of the reservoir.
In step 5, F value at the end of the period is calculated, the F value is more than 3, namely the steam channeling channel is considered, and the steam channeling well group and the steam channeling degree are determined according to the size and distribution of the F value.
In step 6, for the steam channeling well group in the steam channeling development stage and the expansion stage, steam injection is simulated for different oil wells in the steam channeling well group, and the oil production in the period is compared under the condition of relative steam injection amount to determine a steam injection well.
In step 6, if the steam channeling factor is less than 5, injecting steam into different oil wells in the steam channeling well group, simulating the oil production of the steam channeling well group under the condition of the same steam injection amount, and determining a steam injection well.
In step 7, after the steam injection well is determined, oil production of the well group is simulated under the conditions of different steam injection amounts, the oil well and the steam injection cost are comprehensively considered, the steam injection amount is optimized, and the development benefit is improved.
The method for improving the recovery efficiency of the steam channeling horizontal well by steam huffing and puff firstly provides that a steam channeling channel is identified through a steam channeling factor, and the steam channeling degree is quantified; for a well group with low loudness of steam channeling degree, a steam channeling channel is fully utilized, only single well is injected with steam, the steam is channeled to other production wells, and a plurality of wells are simultaneously opened for production; compared with the same injection and production, composite plugging, steam flooding and the like, the technology has the advantages that the construction is simple and convenient, the field operation is utilized more, the steam consumption is reduced, the production effect is ensured, the recovery ratio of the steam channeling horizontal well in steam huff and puff is improved, and the development benefit is improved.
Drawings
FIG. 1 is a flow diagram of an embodiment of a steam stimulated steam channeling horizontal well enhanced oil recovery method of the present invention;
FIG. 2 is a schematic illustration of the development of a steam channeling pathway in accordance with an embodiment of the present invention;
FIG. 3 is a diagram illustrating current simulation results of a steam breakthrough condition in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of the variation of the steam injection temperature field for different wells in an embodiment of the present invention;
FIG. 5 is a schematic illustration of the variation of the steam-injection-steam ratio of different wells in an embodiment of the present invention;
FIG. 6 is a diagram illustrating the change of the oil-to-steam ratio under different steam injection conditions according to 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.
As shown in fig. 1, fig. 1 is a flow chart of the steam stimulated steam channeling horizontal well enhanced oil recovery method of the present invention.
In step 101, acquiring oil reservoir geological basic parameters of a target well, such as oil saturation, permeability, crude oil viscosity, oil reservoir temperature and pressure and the like; and the production parameters of the oil well such as daily fluid, daily oil, water content, cumulative oil production, cumulative water production and cumulative liquid production of the target well.
In step 102, a reservoir geological model is built according to the reservoir geological basic parameters of the target well.
Dividing grids and step lengths according to the reservoir thickness, the control area and the like of a target well through a STARS module of CMG software, simultaneously inputting reservoir geological basic parameters such as viscosity temperature, permeability, oil saturation, oil-water interface, rock fluid physical properties and the like, and establishing a reservoir geological model
In step 103, actual steam injection and production data are input, production history is fitted, and the reservoir geological model is corrected to make the model more accurate.
Inputting actual steam injection data and production data of a target well, operating a mathematical model, simulating the oil production, water production and water content of the well through calculation, comparing the data with the actual data, performing historical fitting, adjusting data such as relative permeability according to a fitting result, correcting the model, controlling an error within 1.0%, and ensuring the accuracy of the model.
In step 104, on the basis of the established reservoir geological model, the changes of temperature fields, pressure fields and saturation fields in different periods are simulated. And simulating temperature fields, pressure fields and saturation fields of the oil wells in different periods through numerical simulation, and determining a steam channeling well group and a steam channeling channel.
In step 105, a blow-by factor is calculated based on the simulation results.
The steam channeling channel is a high-temperature, low-viscosity and high-speed flowing area in the heavy oil thermal recovery process, namely the physical property change range of a reservoir in the steam channeling channel is large. Based on the characteristics, the evaluation index of the steam channeling channel is established:
in the formula: f is a steam channeling factor;
t is reservoir temperature; t is0-reservoir initial temperature;
p is reservoir pressure; p0-reservoir initial pressure;
So-reservoir crude oil saturation; so0-reservoir initial crude oil saturation;
phi-reservoir porosity; phi0-reservoir initial porosity;
k is the permeability of the reservoir; k0-initial permeability of the reservoir;
and calculating F value at the end of the period, wherein the area with the F value larger than 3 is considered as a steam channeling channel, and determining a steam channeling well group and the steam channeling degree according to the size and distribution of the F value.
In step 106, for the steam channeling well group in the steam channeling development stage and the expansion stage, steam injection is simulated for different oil wells in the steam channeling well group, and the oil production in the period is compared under the condition of relative steam injection amount to determine a steam injection well.
And if the steam channeling factor is less than 5, injecting steam into different oil wells in the steam channeling well group, simulating the oil production of the steam channeling well group under the condition of the same steam injection amount, and determining the steam injection well.
In step 107, after the steam injection well is determined, oil production of the well group is simulated under the conditions of different steam injection amounts, the oil well and the steam injection cost are comprehensively considered, the steam injection amount is optimized, and the development benefit is improved.
In one embodiment of the invention, the embodiment comprises: 1# well and 2# well
The 1# well and the 2# well both produce Liangtao 2, the numerical simulation result shows that the two wells have a steam channeling channel, and the 7 th production period currently exists, and the steam channeling channel is in a development stage; and (3) calculating a steam channeling factor, and displaying that the steam channeling factor of the well is 4.2 at most, and the well is in a steam channeling development stage at present, wherein a single-well steam injection mode is adopted to improve the recovery ratio.
And (3) under the condition of the same steam injection amount, respectively simulating steam injection to different wells, and determining the steam injection well to be a No. 2 well according to the oil production amount of the well group.
2# well with steam injection quantityIncreasing, the oil production under the unit steam injection amount shows the trend of rising first and then falling, and the inflection point appears in the period steam injection 2700m3Left and right; the steam swept area is small at low steam injection amount, and the economic benefit is poor at high steam injection amount. Comprehensively considering oil production effect and economic factor, 2300m3-2700m3The steam injection amount is recommended for the period.
Fig. 2 is a schematic view illustrating a process of developing a steam channeling channel according to an embodiment of the present invention, as shown in fig. 2 to 6; FIG. 3 is a diagram illustrating current simulation results of a steam breakthrough condition in accordance with an embodiment of the present invention; FIG. 4 is a schematic illustration of the variation of the steam injection temperature field for different wells in an embodiment of the present invention; FIG. 5 is a schematic illustration of the variation of the steam-injection-steam ratio of different wells in an embodiment of the present invention; FIG. 6 is a diagram illustrating the change of the oil-to-steam ratio under different steam injection conditions according to an embodiment of the present invention.
Claims (10)
1. The method for improving the recovery efficiency of the steam huff and puff horizontal steam channeling well is characterized by comprising the following steps of:
step 1, acquiring oil deposit geological parameters and historical production data of a target well;
step 2, establishing an oil reservoir geological model according to the oil reservoir geological basic parameters of the target well;
step 3, fitting the production history, and correcting the oil reservoir geological model;
step 4, simulating the changes of temperature fields, pressure fields and saturation fields in different periods by numerical values;
step 5, calculating a steam channeling factor according to the simulation result;
step 6, performing numerical simulation to determine a steam injection well;
and 7, performing numerical simulation to determine the steam injection amount and ensure the maximum benefit.
2. The steam stimulated steam channeling horizontal well enhanced oil recovery method according to claim 1, wherein in the step 1, oil reservoir geological basic parameters such as oil saturation, permeability, crude oil viscosity, oil reservoir temperature and pressure of a target well are obtained; daily fluid, daily oil, water content, cumulative oil production, cumulative water production, and cumulative fluid production of the target well.
3. The method for improving the recovery efficiency of the steam-stimulated steam channeling horizontal well according to claim 1, wherein in the step 2, grids and step lengths are divided according to the oil reservoir thickness and the control area of the target well, and an oil reservoir geological model is built according to oil reservoir geological basic parameters such as viscosity temperature, permeability, oil saturation, oil-water interface and rock fluid physical properties.
4. The method for improving the recovery efficiency of the steam-stimulated steam channeling horizontal well according to claim 1, wherein in the step 3, a mathematical model is operated according to actual steam injection data and production data of a target well, oil production, water production and water content of the well are simulated through calculation and compared with the actual data to perform historical fitting, the data of relative permeability are adjusted according to a fitting result, the model is corrected, the error is controlled within 1.0%, and the accuracy of the model is guaranteed.
5. The steam stimulated steam channeling horizontal well enhanced oil recovery method as claimed in claim 1, wherein in the step 4, on the basis of the established reservoir geological model, temperature fields, pressure fields and saturation fields of different periods of an oil well are simulated through numerical simulation, and a steam channeling well group and a steam channeling channel are determined.
6. The steam-stimulated steam channeling horizontal well enhanced oil recovery method according to claim 1, wherein in the step 5, the steam channeling channel is a high-temperature, low-viscosity and high-speed flowing area in the heavy oil thermal recovery process, namely the physical property of a reservoir inside the steam channeling channel is greatly changed; based on the characteristics, the evaluation index of the steam channeling channel is established:
in the formula: f is a steam channeling factor;
t is reservoir temperature; t is0-reservoir initial temperature;
p is reservoir pressure; p0-reservoir initial pressure;
So-reservoir crude oil saturation; so0-reservoir initial crude oil saturation;
phi-reservoir porosity; phi0-reservoir initial porosity;
k is the permeability of the reservoir; k0-initial permeability of the reservoir.
7. The method for improving recovery efficiency of a steam-stimulated steam channeling horizontal well according to claim 6, wherein in the step 5, F value at the end of the period is calculated, the F value is greater than 3, namely the steam channeling channel is considered, and a steam channeling well group and a steam channeling degree are determined according to the size and distribution of the F value.
8. The method for improving the recovery efficiency of a steam-stimulated steam channeling horizontal well according to claim 1, wherein in the step 6, steam injection to different oil wells in the steam channeling well group is simulated for the steam channeling well group in the steam channeling development stage and the expansion stage, and the steam injection well is determined by comparing the oil production in the period under the condition of the same steam injection amount.
9. The method for improving recovery efficiency of a steam-stimulated channeling horizontal well according to claim 8, wherein in step 6, if the steam channeling factor is smaller than 5, steam is injected into different oil wells in the steam channeling well group, oil production of the steam channeling well group is simulated under the condition of the same steam injection amount, and a steam injection well is determined.
10. The method for improving the recovery efficiency of the steam-stimulated steam channeling horizontal well according to claim 1, wherein in the step 7, after the steam injection well is determined, oil production of well groups under different steam injection amounts is simulated, oil wells and steam injection costs are comprehensively considered, the steam injection amount is optimized, and development benefits are improved.
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| CN110067546A (en) * | 2019-04-15 | 2019-07-30 | 中国石油化工股份有限公司 | The method of discrimination of oil well channeling in steam-drive process |
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