CN111561301A - Method for determining crude oil viscosity boundary of water injection development of heavy oil reservoir - Google Patents
Method for determining crude oil viscosity boundary of water injection development of heavy oil reservoir Download PDFInfo
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- CN111561301A CN111561301A CN202010621075.7A CN202010621075A CN111561301A CN 111561301 A CN111561301 A CN 111561301A CN 202010621075 A CN202010621075 A CN 202010621075A CN 111561301 A CN111561301 A CN 111561301A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000010779 crude oil Substances 0.000 title claims abstract description 66
- 238000011161 development Methods 0.000 title claims abstract description 32
- 239000000295 fuel oil Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002347 injection Methods 0.000 title claims abstract description 19
- 239000007924 injection Substances 0.000 title claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims abstract description 63
- 239000003921 oil Substances 0.000 claims abstract description 61
- 238000011084 recovery Methods 0.000 claims abstract description 29
- 230000008901 benefit Effects 0.000 claims abstract description 15
- 238000002474 experimental method Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000011234 economic evaluation Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 2
- 238000012935 Averaging Methods 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a method for determining a crude oil viscosity boundary for water injection development of a heavy oil reservoir. The method comprises the following steps of (1) establishing curve charts of oil displacement efficiency under different crude oil viscosities through an indoor water oil displacement experiment; (2) predicting recovery ratio by adopting a common water flooding curve so as to calculate a volume sweep coefficient; (3) and determining the oil displacement efficiency corresponding to the economic recovery ratio by considering the factors of the water-flooding economic benefit, and determining a reasonable crude oil viscosity limit by reversely checking a curve plate. The invention has the advantages that: according to the traditional method, an inflection point of a relation graph of displacement efficiency and crude oil viscosity is a viscosity limit, and the economical efficiency is not considered; the concept of economic ultimate recovery of water injection development is introduced, the research on the crude oil viscosity limit is more accurate and practical, and a reference basis is provided for the subsequent water drive development of the deep heavy oil reservoir.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to the economic benefit development of a deep heavy oil reservoir.
Background
For a heavy oil reservoir with a deeper buried layer, thermal recovery technology is limited due to a large amount of heat loss along a shaft in the steam injection process, and economic benefits are difficult to guarantee. Aiming at heavy oil reservoirs, water flooding is a simple and cheap basic development mode and can obtain better development effect. Because the crude oil viscosity difference of different parts of the oil reservoir is large, when the crude oil viscosity of the oil reservoir is larger than a critical value, the recovery ratio of the water-flooding oil reservoir is greatly reduced, and the water injection development has no economic benefit, so the reasonable crude oil viscosity limit of the water injection development must be determined according to the influence of the crude oil viscosity on the water-flooding recovery ratio.
However, at present, no accurate method is available for determining the crude oil viscosity limit in the water flooding development of the heavy oil reservoir. The traditional method is that the inflection point value of a curve graph of the relation between the oil displacement efficiency and the crude oil viscosity is used as the crude oil viscosity limit. In fact, the viscosity at the inflection point reflects only the rapid change in displacement efficiency with crude oil viscosity, at which it is unknown whether economic benefits can be obtained through water injection development. Therefore, it is not reasonable to limit the value as the viscosity of the water-flooding crude oil.
Disclosure of Invention
Aiming at the defects of the existing method, the invention provides a method for determining the crude oil viscosity boundary of the water injection development of the heavy oil reservoir.
The principle of the method of the invention is as follows:
the recovery ratio is equal to the product of the sweep efficiency and the oil displacement efficiency:
ER＝ED·EV(1)
the reasonable crude oil viscosity limit of water injection development can be determined according to the formula, the experimental results in the water flooding displacement chamber, actual production data and other parameters.
According to the introduction, the method for determining the crude oil viscosity limit of the water injection development of the heavy oil reservoir comprises the following specific steps:
1. oil displacement efficiency
The oil displacement efficiency under different crude oil viscosities is determined through a water displacement experiment, the water displacement efficiency is generally consistent with the change trend of the crude oil viscosity, and the oil displacement efficiency is reduced along with the increase of the crude oil viscosity. And (4) carrying out arithmetic average on the experimental value of the oil displacement by water, and drawing a relation curve of the averaged oil displacement efficiency along with the change of the crude oil viscosity.
And drawing a semilogarithmic relation graph of the oil displacement efficiency and the crude oil viscosity, wherein the curve is roughly divided into two straight lines, namely a low straight line and a steep straight line, an obvious inflection point is arranged on the curve of the oil displacement efficiency along with the change of the crude oil viscosity, the curve shows that when the crude oil viscosity is lower than the inflection point value, the oil displacement efficiency is slowly reduced along with the increase of the viscosity, and when the viscosity exceeds the inflection point value, the oil displacement efficiency is rapidly reduced.
2. Sweep coefficient
For the oil reservoir in the middle water-cut period, estimating the recoverable reserves by using an empirical water flooding curve; in the newly issued industrial standard SY/T5367-2010, a method for selecting the water drive characteristic curve by taking the crude oil viscosity as an index is eliminated, so that the corresponding water drive recoverable reserves are respectively calculated by adopting the four most extensive and most effective water drive curves recorded in the national industrial standard and then selected.
And drawing four water drive curves of the A type, the B type, the C type and the D type which are commonly used according to production data of a test area, and respectively calculating corresponding water drive recoverable reserve and recovery ratio. And selecting each water drive curve with relatively close water drive recoverable reserve, taking the average value of the corresponding recovery ratio in the predicted recovery ratio, substituting the oil displacement efficiency value in a semilogarithmic relation graph of oil displacement efficiency and oil viscosity corresponding to the oil displacement viscosity value of the water drive reservoir into a formula (1) to calculate the volume sweep coefficient.
3. Reasonable crude oil viscosity limit
And carrying out economic evaluation on the heavy oil reservoir, and if the recovery ratio of water flooding development can reach a certain value, obtaining a certain economic benefit, so that the value is calibrated as the lower limit of the recovery ratio of the oil reservoir water flooding development. Substituting the economic recovery rate value and the obtained water-flooding volume sweep factor value into formula (1) for calculation to obtain a lower limit value of oil displacement efficiency corresponding to the economic recovery rate; and (3) reversely checking a determination chart (a semilogarithmic relation chart of the oil displacement efficiency and the crude oil viscosity) of the crude oil viscosity limit of the water injection development corresponding to the oil displacement efficiency lower limit, and checking the corresponding crude oil viscosity when the oil displacement efficiency value under the economic benefit is considered, wherein the point is a reasonable crude oil viscosity limit value of the water injection development of the heavy oil reservoir.
Compared with the prior art, the invention has the advantages that: according to the test result and production data of the oil reservoir, a method for determining the crude oil viscosity limit of the water injection development of the heavy oil reservoir is provided. The economic benefit of water injection development is considered, so that the method is more accurate and more applicable.
Drawings
FIG. 1 is a water flooding test result curve under different crude oil viscosity conditions implemented by the present invention;
FIG. 2 is a graph of the change of the viscosity of crude oil with the displacement efficiency according to the embodiment of the present invention;
FIG. 3 is a graph of oil displacement efficiency versus semi-logarithmic crude oil viscosity for the practice of the present invention;
FIG. 4 is a graph of type A and type B water flooding curves for an embodiment of the present invention;
FIG. 5 is a water flooding curve for type C and type D embodiments of the present invention;
FIG. 6 is a semi-logarithmic plot of oil displacement efficiency versus crude oil viscosity for an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail by referring to the following examples.
A method for determining a crude oil viscosity limit for waterflooding development of a heavy oil reservoir in consideration of economic effects comprises the following steps:
1. oil displacement efficiency
The heavy oil reservoir developed by water flooding is selected as an example, and the oil displacement efficiency under different crude oil viscosities is determined through a water displacement experiment.
Test results the displacement efficiency is shown in table 1.
TABLE 1 Displacement efficiency at different crude oil viscosities
Fig. 1 is a water displacement efficiency experimental result diagram of No. 1 and No. 2 cores under different crude oil viscosity conditions, and it can be seen from the diagram that although the permeability of the two cores is different, the water displacement efficiency is generally consistent with the variation trend of the crude oil viscosity, and the oil displacement efficiency is reduced with the increase of the crude oil viscosity.
The experimental values are arithmetically averaged by combining the experimental results of the water flooding efficiency of the two cores, and a curve of the variation relationship of the average flooding efficiency along with the viscosity of the crude oil is drawn as shown in fig. 2.
FIG. 3 is a graph of displacement efficiency versus crude oil viscosity in a semi-logarithmic manner. The curve is roughly divided into two straight lines, namely a low straight line and a steep straight line, and an obvious inflection point is formed on the curve of the displacement efficiency along with the change of the oil viscosity. Expressed as the displacement efficiency slowly decreasing with increasing viscosity when the viscosity of the crude oil is below the inflection point, and rapidly decreasing when the viscosity exceeds this value.
2. Calculation of volume sweep coefficients
For reservoirs in the mid water phase, empirical water flooding curves are used to estimate recoverable reserves. In the newly issued industrial standard SY/T5367-2010, a method for selecting the water drive characteristic curve by taking the crude oil viscosity as an index is eliminated, so that the corresponding water drive recoverable reserves are respectively calculated by adopting the four most extensive and most effective water drive curves recorded in the national industrial standard and then selected.
According to the production data of the test area, four water drive curves of the general types A, B, C and D are drawn, as shown in figures 4 and 5, and the corresponding recoverable reserves and recovery rates can be predicted, as shown in table 2.
TABLE 2 statistical table of water flooding curve method prediction recovery ratio
And (3) selecting each water drive curve of which the water drive curve predicted water drive recoverable reserve is relatively close to that in the table 2, taking the average value of the predicted recovery ratio, taking the viscosity value of crude oil of the water drive reservoir corresponding to the oil displacement efficiency value in the graph 3, and substituting the viscosity value of the crude oil into the formula (1) to calculate the volume sweep coefficient.
3. Determination of a reasonable crude oil viscosity threshold
And carrying out economic evaluation on the heavy oil reservoir, and if the recovery ratio of the water flooding development can reach a certain value, obtaining a certain economic benefit, so that the value is calibrated as the lower limit of the recovery ratio of the reservoir flooding development. And (3) substituting the economic recovery rate value and the obtained water-drive volume sweep factor value into formula (1) for calculation to obtain a lower limit value of oil-drive efficiency corresponding to the economic recovery rate. And reversely checking a determination chart (figure 3) of the oil displacement efficiency limit of the water injection development crude oil corresponding to the oil displacement efficiency lower limit, and checking the corresponding crude oil viscosity when the oil displacement efficiency value under the economic benefit is considered, wherein the point is the reasonable crude oil viscosity limit value of the water injection development of the heavy oil reservoir.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (1)
1. A method for determining a crude oil viscosity boundary for water injection development of a heavy oil reservoir is characterized by comprising the following steps:
step 1, oil displacement efficiency;
the indoor oil displacement by water experiment confirms the oil displacement efficiency under different crude oil viscosities, the oil displacement by water efficiency is generally consistent with the change trend of crude oil viscosity, and the oil displacement efficiency is reduced with the increase of crude oil viscosity;
carrying out arithmetic averaging on the experimental values of the oil displacement by water, and drawing a relation curve of the averaged oil displacement efficiency along with the change of the crude oil viscosity;
drawing a semilogarithmic relation graph of the oil displacement efficiency and the crude oil viscosity, wherein a curve is roughly divided into two straight lines, namely a low straight line and a steep straight line, an obvious inflection point is arranged on a curve of the oil displacement efficiency along with the change of the oil viscosity, and the curve shows that when the crude oil viscosity is lower than the inflection point value, the oil displacement efficiency slowly decreases along with the increase of the viscosity, and when the viscosity exceeds the inflection point value, the displacement efficiency rapidly decreases;
step 2, the sweep coefficient;
for the oil deposit with medium water-cut period, estimating the recoverable reserve by using an empirical water drive curve, and deleting the method for selecting the water drive characteristic curve by using the crude oil viscosity as an index in the newly issued industrial standard SY/T5367-2010, so that respectively calculating the corresponding water drive recoverable reserve by using the four most extensive and effective water drive curves recorded in the national industrial standard and then selecting the water drive recoverable reserve;
drawing four water drive curves of a common A type, a common B type, a common C type and a common D type according to production data of a test area, and respectively calculating corresponding water drive recoverable reserve and recovery ratio;
selecting each water drive curve with relatively close water drive recoverable reserve, taking the average value of the corresponding recovery ratio in the predicted recovery ratio, substituting the oil displacement efficiency value in a semilogarithmic relation graph of oil displacement efficiency and oil viscosity corresponding to the oil viscosity value of the water drive reservoir into a formula (1) to calculate a volume sweep coefficient;
the recovery ratio is equal to the product of the sweep efficiency and the oil displacement efficiency:
ER＝ED·EV(1)
step 3, the viscosity limit of the crude oil is reasonable;
carrying out economic evaluation on the heavy oil reservoir, and if the recovery ratio of water flooding development can reach a certain value, obtaining a certain economic benefit, so that the value is calibrated as the lower limit of the recovery ratio of reservoir flooding development;
substituting the economic recovery rate value and the obtained water-flooding volume sweep factor value into formula (1) for calculation to obtain a lower limit value of oil displacement efficiency corresponding to the economic recovery rate;
and (3) reversely checking a curve chart of the oil displacement efficiency and crude oil viscosity limit of water injection development corresponding to the lower limit of the oil displacement efficiency (a semilogarithmic relation chart of the oil displacement efficiency and the crude oil viscosity), and checking the corresponding crude oil viscosity when the oil displacement efficiency value under the economic benefit is considered, wherein the point is the reasonable crude oil viscosity limit value of the water injection development of the heavy oil reservoir.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145139A (en) * | 2020-10-26 | 2020-12-29 | 西南石油大学 | Method for reasonably mapping polymer flooding use concentration by crude oil viscosity |
| CN114136838A (en) * | 2021-11-19 | 2022-03-04 | 中国海洋石油集团有限公司 | Method for determining viscosity limit of water injection flooding crude oil at different water-containing stages of offshore heavy oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114136838A (en) * | 2021-11-19 | 2022-03-04 | 中国海洋石油集团有限公司 | Method for determining viscosity limit of water injection flooding crude oil at different water-containing stages of offshore heavy oil |
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Application publication date: 20200821 |