CN110644982A - Rapid quantitative description method for low-permeability reservoir channeling channel - Google Patents
Rapid quantitative description method for low-permeability reservoir channeling channel Download PDFInfo
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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
- 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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- 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
- E21B43/20—Displacing by water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention provides a quick quantitative description method for a low-permeability reservoir channeling passage, which comprises the following steps of determining the quantitative description range of different types of reservoir channeling passages of the low-permeability reservoir; step two, calculating the change curves of the permeability of the oil reservoir channeling channel of the same type, the thickness of the channeling channel, the pore throat radius and the pore volume; calculating a single-well A-type water drive characteristic curve of the production well, and searching for the production well with an upward warping straight line section in the water drive characteristic curve; dividing channeling channels which develop along different directions of the development well pattern by taking the water injection well as a center; according to the method, four parameters of permeability, pore volume, pore throat radius and channeling channel thickness of the channeling channel of the low-permeability reservoir can be rapidly calculated through the dynamic data of low-permeability reservoir production, so that quantitative identification and quantitative description of the channeling channel of the low-permeability reservoir are realized.
Description
Technical Field
The invention relates to the technical field of reservoir engineering in oil and gas field development, in particular to a quick quantitative description method for a low-permeability reservoir channeling channel.
Background
The experience of water flooding oil field development at home and abroad shows that the formation of a channeling channel is inevitable after the water flooding oil field enters a medium-high water content period. In the long-term water flooding development process, the pore throat radius of a low-permeability reservoir is increased due to geological factors such as reservoir heterogeneity and the like and development factors such as too high exploitation speed and the like, so that secondary high-permeability strips, namely flow channeling channels and dominant seepage channels are formed in the reservoir, a large amount of injected water is low in efficiency and serious in ineffective circulation, the sweep efficiency is reduced, and the water flooding development effect is seriously influenced. Therefore, how to select reasonable process measures for treatment and enlarge the sweep efficiency becomes a problem which needs to be solved urgently for a medium-high water-cut oil reservoir or a water-flooded oil reservoir. The key and the primary work for solving the problems is to accurately and effectively identify the channeling channel.
At present, the identification method of the channeling flow channel comprises a logging method, an interwell dynamic monitoring method, a well testing method, a coring method and an oil reservoir engineering method, and the theories and the identification methods based on the channeling flow channel are different. Due to poor permeability of low-permeability oil reservoirs, the conventional method is low in recognition degree, the special monitoring method is high in cost and long in period, and most methods cannot realize quantitative recognition of a cross-flow channel, so that the method becomes a main bottleneck for restricting the expansion and application of the technology. Aiming at the characteristics of low permeability oil reservoirs, the method is of great importance in developing a channeling channel identification and quantitative description method which is low in cost, high in identification degree and rapid in quantification by fully utilizing the existing data.
Therefore, the quick quantitative description method of the low-permeability reservoir channeling channel is provided by combining a large amount of actual reservoir production dynamic data and a small amount of tracer test results, and the channeling channel is quantitatively described by calculating the slope of the upwarp section of the oil well water drive characteristic curve so as to solve the parameters of permeability, pore volume, pore throat radius, channeling channel thickness and the like of the low-permeability reservoir channeling channel, so that the channeling channels with different development degrees are obtained. Compared with the existing description method, the method has the advantages of low cost, easy parameter acquisition and high judgment degree, can quickly realize quantitative identification and quantitative description of the channeling channel, is beneficial to oil field popularization, and provides a basis for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision and recovery efficiency improving technology.
Disclosure of Invention
In order to solve the problems that the existing channeling channel identification method is high in cost and long in period, and most methods cannot realize quantitative identification of the channeling channel, the invention provides a rapid quantitative description method for the channeling channel of the low-permeability reservoir. According to the quantitative description result of the channeling channel, a basis is provided for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision, plugging agent system dosage calculation and the technology of improving the recovery ratio of the oil field.
The technical scheme adopted by the invention is as follows:
a quick quantitative description method for a low permeability reservoir channeling channel comprises the following specific steps:
determining quantitative description ranges of different types of oil reservoir channeling channels of a low-permeability oil reservoir;
step two, calculating the change curves of the permeability of the oil reservoir channeling channel of the same type, the thickness of the channeling channel, the pore throat radius and the pore volume;
calculating a single-well A-type water drive characteristic curve of the production well, and searching for the production well with an upward warping straight line section in the water drive characteristic curve;
dividing channeling channels which develop along different directions of the development well pattern by taking the water injection well as a center;
calculating the ratio of the permeability of the channeling channel to the corresponding injection-production well distance and the change curve of the slope of the upward-warping straight line segment in the corresponding A-type water flooding characteristic curve along different directions;
sixthly, calculating the permeability of the low-permeability reservoir channeling channel;
step seven, calculating the thickness, pore throat radius and pore volume of the low permeability reservoir channeling channel; and realizing quantitative description of the low permeability reservoir channeling channel.
In the first step, determining the quantitative description range of the channeling channels of different types of oil reservoirs of the low-permeability oil reservoir: the blocks with the same development horizon, adjacent geographical positions, similar deposition background, similar permeability and similar heterogeneity in the low-permeability oil reservoir are classified as an oil reservoir.
And in the second step, according to the tracer test results of the oil reservoirs of the same type collected in the first step, the change curves of the permeability of the cross flow channel, the thickness of the cross flow channel, the pore throat radius and the pore volume are counted.
In the third step, the water content of the production well is increased due to the formation of the channeling channel, the slope is reflected to be increased in the water flooding characteristic curve, the curve is upwards tilted, and the production well with the upwards tilted straight line segment in the water flooding characteristic curve is searched.
In the fourth step, the water injection well is used as the center, and the development directions of 4 channeling channels can be divided, namely the diagonal direction of the two corner wells and the direction of the two side wells.
In the fifth step, along different directions, calculating a change curve of the ratio of the permeability of the channeling flow channel to the corresponding injection-production well distance to the slope of the upward-warping straight line segment in the corresponding A-type water drive characteristic curve: and calculating the ratio of the permeability of the channeling channel in different directions to the corresponding injection-production well distance according to the second step and the fourth step, and calculating the slope of the upwarp straight line segment in the corresponding production well type A water drive characteristic curve according to the third step to obtain a change curve of the ratio of the permeability to the injection-production well distance in different directions to the slope of the upwarp straight line segment.
In the sixth step, the permeability of the low-permeability reservoir channeling channel is calculated: and calculating the slope of the upwarping straight line segment of the A-type water flooding characteristic curve of the production well according to the third step, and then calculating the permeability of the channeling channel according to the fifth step.
And seventhly, calculating the thickness, the pore throat radius and the pore volume of the low-permeability reservoir channeling channel: and respectively calculating the thickness, the pore throat radius and the pore volume of the low-permeability reservoir channeling channel according to the penetration rate of the channeling channel in the sixth step, so as to realize the quantitative description of the low-permeability reservoir channeling channel.
The invention has the beneficial effects that:
according to the method, four parameters of permeability, pore volume, pore throat radius and channeling channel thickness of the channeling channel of the low-permeability reservoir can be rapidly calculated through the dynamic data of low-permeability reservoir production, so that quantitative identification and quantitative description of the channeling channel of the low-permeability reservoir are realized.
By quantitatively describing the low-permeability reservoir channeling channel, the method can dynamically analyze the water drive development characteristics of the low-permeability reservoir in real time, can provide bases for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision, plugging agent system dosage calculation and recovery efficiency improving technologies of oil fields, and provides evaluation means for development technical policies and different measure effects.
Detailed Description
Example 1:
in order to solve the problems that the existing channeling channel identification method is high in cost and long in period, and most methods cannot realize quantitative identification of the channeling channel, the invention provides a rapid quantitative description method for the channeling channel of the low-permeability reservoir. According to the quantitative description result of the channeling channel, a basis is provided for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision, plugging agent system dosage calculation and the technology of improving the recovery ratio of the oil field.
A quick quantitative description method for a low permeability reservoir channeling channel comprises the following specific steps:
determining quantitative description ranges of different types of oil reservoir channeling channels of a low-permeability oil reservoir;
step two, calculating the change curves of the permeability of the oil reservoir channeling channel of the same type, the thickness of the channeling channel, the pore throat radius and the pore volume;
calculating a single-well A-type water drive characteristic curve of the production well, and searching for the production well with an upward warping straight line section in the water drive characteristic curve;
dividing channeling channels which develop along different directions of the development well pattern by taking the water injection well as a center;
calculating the ratio of the permeability of the channeling channel to the corresponding injection-production well distance and the change curve of the slope of the upward-warping straight line segment in the corresponding A-type water flooding characteristic curve along different directions;
sixthly, calculating the permeability of the low-permeability reservoir channeling channel;
step seven, calculating the thickness, pore throat radius and pore volume of the low permeability reservoir channeling channel; and realizing quantitative description of the low permeability reservoir channeling channel.
The existing channeling channel identification method comprises a well logging method, an interwell dynamic monitoring method, a well testing method, a coring method, an oil reservoir engineering method and a numerical simulation method. Because the low permeability reservoir has poor permeability and low liquid production amount, the conventional method has low identification degree, can only realize the qualitative identification of the channeling channel, but cannot realize the quantitative identification; although the quantitative identification of the channeling channel can be realized by means of the coring and special monitoring method, the cost is high, and the period is long, so that the large-scale popularization and application cannot be realized. The unclear knowledge of the channeling flow channel can interfere the formulation of the technical policy of the development of the low-permeability oil field and the pertinence of the measures of the oil-water well, and the long-term stable yield of the low-permeability oil field is seriously influenced. According to the method, four parameters of permeability, pore volume, pore throat radius and channeling channel thickness of the channeling channel of the low-permeability reservoir can be rapidly calculated through the dynamic data of low-permeability reservoir production, so that quantitative identification and quantitative description of the channeling channel of the low-permeability reservoir are realized. By quantitatively describing the channeling channel of the low-permeability reservoir, the method can dynamically analyze the water drive development characteristics of the low-permeability reservoir in real time, and can provide a basis for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision, plugging agent system dosage calculation and recovery efficiency improving technologies of oil fields.
The method realizes quantitative description of the channeling channels with different scales of the low-permeability oil reservoir by using four parameter indexes of permeability, pore volume, pore throat radius and channeling channel thickness of the channeling channel, and provides a calculation method and a flow of the permeability, the pore volume, the pore throat radius and the channeling channel thickness of the channeling channel. According to the quantitative description result of the channeling channel, a basis is provided for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision, plugging agent system dosage calculation and the technology of improving the recovery ratio of the oil field.
Example 2:
based on the example 1, in this embodiment, in the first step, the quantitative description range of the different types of reservoir channeling channels of the low permeability reservoir is determined: the blocks with the same development horizon, adjacent geographical positions, similar deposition background, similar permeability and similar heterogeneity in the low-permeability oil reservoir are classified as an oil reservoir.
And in the second step, according to the tracer test results of the oil reservoirs of the same type collected in the first step, the change curves of the permeability of the cross flow channel, the thickness of the cross flow channel, the pore throat radius and the pore volume are counted.
In the third step, the water content of the production well is increased due to the formation of the channeling channel, the slope is reflected to be increased in the water flooding characteristic curve, the curve is upwards tilted, and the production well with the upwards tilted straight line segment in the water flooding characteristic curve is searched.
In the fourth step, the water injection well is used as the center, and the development directions of 4 channeling channels can be divided, namely the diagonal direction of the two corner wells and the direction of the two side wells.
In the fifth step, along different directions, calculating a change curve of the ratio of the permeability of the channeling flow channel to the corresponding injection-production well distance to the slope of the upward-warping straight line segment in the corresponding A-type water drive characteristic curve: and calculating the ratio of the permeability of the channeling channel in different directions to the corresponding injection-production well distance according to the second step and the fourth step, and calculating the slope of the upwarp straight line segment in the corresponding production well type A water drive characteristic curve according to the third step to obtain a change curve of the ratio of the permeability to the injection-production well distance in different directions to the slope of the upwarp straight line segment.
In the sixth step, the permeability of the low-permeability reservoir channeling channel is calculated: and calculating the slope of the upwarping straight line segment of the A-type water flooding characteristic curve of the production well according to the third step, and then calculating the permeability of the channeling channel according to the fifth step.
And seventhly, calculating the thickness, the pore throat radius and the pore volume of the low-permeability reservoir channeling channel: and respectively calculating the thickness, the pore throat radius and the pore volume of the low-permeability reservoir channeling channel according to the penetration rate of the channeling channel in the sixth step, so as to realize the quantitative description of the low-permeability reservoir channeling channel.
The invention provides a quick and quantitative description method for a channeling channel of a low-permeability reservoir, which is a quick and quantitative description method for the channeling channel of the low-permeability reservoir by combining a large amount of reservoir production dynamic data and a small amount of tracer test results, and realizes the quantitative description of the channeling channel of the low-permeability reservoir in different scales by four parameter indexes of permeability, pore volume, pore throat radius and channeling channel thickness of the channeling channel, wherein the calculation method and the flow of each parameter of the channeling channel are as follows:
(1) determining the quantitative description range of different types of reservoir channeling channels of the low-permeability reservoir: the blocks with the same development horizon, adjacent geographical positions, similar deposition background, similar permeability and similar heterogeneity in the low-permeability oil reservoir are classified as an oil reservoir.
(2) Counting the change curves of the permeability of the oil reservoir channeling channel, the thickness of the channeling channel, the pore throat radius and the pore volume: and (2) collecting tracer test results of the oil reservoirs according to the step (1), and counting change curves of the permeability of the cross flow channel, the thickness of the cross flow channel, the pore throat radius and the pore volume.
(3) Calculating a single-well A-type water drive characteristic curve of the production well, and searching for the production well with an upward warping straight line section in the water drive characteristic curve: the formation of the channeling channel marks that the water content of the production well rises rapidly, the slope is reflected to be increased on the water drive characteristic curve, the curve is upwarped, and the step is to find the production well with the upwarped straight line segment in the water drive characteristic curve.
(4) Taking a water injection well as a center, dividing channeling channels developing along different directions of a development well pattern: taking a rhombic inverse nine-point well pattern as an example, taking a water injection well as a center, 4 developing directions of the channeling channels can be divided, namely the diagonal direction of the connection of two corner wells and the direction of the connection of two side wells.
(5) Calculating the ratio of the permeability of the channeling channel to the corresponding injection-production well distance and the change curve of the slope of the upward-warping straight line segment in the corresponding A-type water flooding characteristic curve along different directions: and (3) calculating the ratio of the permeability (trace test result) of the channeling channel in different directions to the corresponding injection-production well distance according to the steps (2) and (4), and calculating the slope of the upward-warping straight line segment in the A-type water drive characteristic curve of the corresponding production well according to the step (3) to obtain a change curve of the ratio of the permeability to the injection-production well distance in different directions to the slope of the upward-warping straight line segment.
(6) And (3) rapidly calculating the permeability of the channeling channel of the low-permeability reservoir: and (4) calculating the slope of the upwarping straight line segment of the A-type water flooding characteristic curve of the production well according to the step (3), and then calculating the permeability of the channeling channel according to the step (5).
(7) And (3) rapidly calculating the thickness, pore throat radius and pore volume of the channeling channel of the low-permeability reservoir: and (4) respectively calculating the thickness, pore throat radius and pore volume of the low-permeability reservoir channeling passage according to the step (6) through the permeability of the channeling passage. Therefore, quantitative description of the low permeability reservoir channeling channel is realized.
According to the method, four parameters of permeability, pore volume, pore throat radius and channeling channel thickness of the channeling channel of the low-permeability reservoir can be rapidly calculated through the dynamic data of low-permeability reservoir production, so that quantitative identification and quantitative description of the channeling channel of the low-permeability reservoir are realized.
By quantitatively describing the low-permeability reservoir channeling channel, the method can dynamically analyze the water drive development characteristics of the low-permeability reservoir in real time, can provide bases for fine injection and production adjustment, well pattern adjustment, water injection mode conversion, deep profile control decision, plugging agent system dosage calculation and recovery efficiency improving technologies of oil fields, and provides evaluation means for development technical policies and different measure effects.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention. The steps and systems of the method not described in detail in this embodiment are all common knowledge or common practice in the art, and are not described here.
Claims (8)
1. A quick quantitative description method for a low permeability reservoir channeling channel is characterized by comprising the following steps: the method comprises the following specific steps:
determining quantitative description ranges of different types of oil reservoir channeling channels of a low-permeability oil reservoir;
step two, calculating the change curves of the permeability of the oil reservoir channeling channel of the same type, the thickness of the channeling channel, the pore throat radius and the pore volume;
calculating a single-well A-type water drive characteristic curve of the production well, and searching for the production well with an upward warping straight line section in the water drive characteristic curve;
dividing channeling channels which develop along different directions of the development well pattern by taking the water injection well as a center;
calculating the ratio of the permeability of the channeling channel to the corresponding injection-production well distance and the change curve of the slope of the upward-warping straight line segment in the corresponding A-type water flooding characteristic curve along different directions;
sixthly, calculating the permeability of the low-permeability reservoir channeling channel;
step seven, calculating the thickness, pore throat radius and pore volume of the low permeability reservoir channeling channel; and realizing quantitative description of the low permeability reservoir channeling channel.
2. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: in the first step, determining the quantitative description range of the channeling channels of different types of oil reservoirs of the low-permeability oil reservoir: the blocks with the same development horizon, adjacent geographical positions, similar deposition background, similar permeability and similar heterogeneity in the low-permeability oil reservoir are classified as an oil reservoir.
3. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: and in the second step, according to the tracer test results of the oil reservoirs of the same type collected in the first step, the change curves of the permeability of the cross flow channel, the thickness of the cross flow channel, the pore throat radius and the pore volume are counted.
4. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: in the third step, the water content of the production well is increased due to the formation of the channeling channel, the slope is reflected to be increased in the water flooding characteristic curve, the curve is upwards tilted, and the production well with the upwards tilted straight line segment in the water flooding characteristic curve is searched.
5. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: in the fourth step, the water injection well is used as the center, and the development directions of 4 channeling channels can be divided, namely the diagonal direction of the two corner wells and the direction of the two side wells.
6. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: in the fifth step, along different directions, calculating a change curve of the ratio of the permeability of the channeling flow channel to the corresponding injection-production well distance to the slope of the upward-warping straight line segment in the corresponding A-type water drive characteristic curve: and calculating the ratio of the permeability of the channeling channel in different directions to the corresponding injection-production well distance according to the second step and the fourth step, and calculating the slope of the upwarp straight line segment in the corresponding production well type A water drive characteristic curve according to the third step to obtain a change curve of the ratio of the permeability to the injection-production well distance in different directions to the slope of the upwarp straight line segment.
7. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: in the sixth step, the permeability of the low-permeability reservoir channeling channel is calculated: and calculating the slope of the upwarping straight line segment of the A-type water flooding characteristic curve of the production well according to the third step, and then calculating the permeability of the channeling channel according to the fifth step.
8. The method for quickly and quantitatively describing the channeling channel of the low-permeability reservoir as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps: and seventhly, calculating the thickness, the pore throat radius and the pore volume of the low-permeability reservoir channeling channel: and respectively calculating the thickness, the pore throat radius and the pore volume of the low-permeability reservoir channeling channel according to the penetration rate of the channeling channel in the sixth step, so as to realize the quantitative description of the low-permeability reservoir channeling channel.
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| CN113863920A (en) * | 2021-09-10 | 2021-12-31 | 西南石油大学 | Method for detecting volume of gas channeling channel |
| CN113863920B (en) * | 2021-09-10 | 2023-09-19 | 西南石油大学 | Method for detecting volume of gas channeling channel |
| CN114186503A (en) * | 2021-10-20 | 2022-03-15 | 中国石油化工股份有限公司 | Method and device for identifying water channeling channel of heavy oil reservoir |
| CN114186503B (en) * | 2021-10-20 | 2022-09-09 | 中国石油化工股份有限公司 | Method and device for identifying water channeling channel of heavy oil reservoir |
| CN115341885A (en) * | 2022-08-29 | 2022-11-15 | 中国石油大学(北京) | Method and device for determining volume of steam-driven channeling channel |
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