CN111502615B - Well group injection-production relationship perfection quantitative evaluation method based on plane - Google Patents
Well group injection-production relationship perfection quantitative evaluation method based on plane Download PDFInfo
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- CN111502615B CN111502615B CN201911313226.6A CN201911313226A CN111502615B CN 111502615 B CN111502615 B CN 111502615B CN 201911313226 A CN201911313226 A CN 201911313226A CN 111502615 B CN111502615 B CN 111502615B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000011158 quantitative evaluation Methods 0.000 title claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 238000011156 evaluation Methods 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims abstract description 4
- BTCSSZJGUNDROE-UHFFFAOYSA-N gamma-aminobutyric acid Chemical compound NCCCC(O)=O BTCSSZJGUNDROE-UHFFFAOYSA-N 0.000 claims description 2
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009897 systematic effect Effects 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
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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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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Abstract
The invention relates to the technical field of oil extraction engineering, in particular to a well group injection-production relationship perfection degree evaluation method. The method solves the problems that injection-production relation is complex and the perfection degree cannot be accurately evaluated due to the mutual cross influence among multiple sets of well groups. The method comprises the steps of firstly determining injection-production well groups taking each injection well as a center by utilizing the inter-well distance, and then realizing quantitative evaluation of the perfection degree of injection-production relation of the well groups by defining three parameters of well group coordination coefficients, well distance uniformity and phase distribution uniformity. The invention has the advantages of simple and convenient practical application, ensuring that the production wells are uniformly affected on the plane of the selected well group, providing an effective foundation for the subsequent optimization measure well group and the like.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering, in particular to a quantitative evaluation method for the perfection degree of a well group injection-production relation based on a plane.
Background
Along with the development of each large oil field in the middle and later stages, matched production increasing measures are needed to increase the recovery ratio of crude oil. Before the field test of the production increasing measures, a test well group is selected, and the condition that the injection-production relation of the well group is perfect is an important condition for the test well group. The existing method for evaluating the perfection degree of the injection-production relationship is mainly based on a conventional well pattern deployment mode for judging, such as a five-point well pattern, a nine-point well pattern and the like, only the number of injection-production wells is considered, the evaluation method is not systematic, and the perfection degree of the injection-production relationship cannot be quantitatively explained.
Disclosure of Invention
The invention aims to quantitatively evaluate the completion degree of the injection-production relationship of a well group by using a well group plane coordinate system, ensure that a production well is uniformly affected, realize the quick identification of the well group and effectively quantitatively evaluate the completion degree of the injection-production relationship of the well group based on the plane, which provides a basis for the subsequent optimization of a test well group.
The technical scheme of the invention is as follows: the evaluation method comprises the following steps:
the first step is as follows: determining injection-production well group
Selecting any one injection well Z in the blockwDefinition of RnIs ZwDistance to other injection wells within the block:
wherein: rnInjection well ZwDistance to other injection wells within the block;
(x1,y1) Injection well ZwCoordinates of well points;
(x2,y2) -remaining injection well point coordinates within the block;
definition of RminIs RnTo the injection well ZwAs a center of circle, a distance RminDrawing a circle for the radius, the producing well and the injection well Z in the circlewThe same injection well group;
the second step is that: determining the perfection of injection-production relationship
For the same injection-production well group, the coordination coefficient gamma of the well group is definednWell spacing uniformity gammarAnd phase distribution uniformity gammaαThree parameters are used for realizing quantitative evaluation of the injection-production relationship perfection degree gamma of the well group;
γ＝γnγrγα
wherein: gamma-well group injection-production relation perfection degree;
γn-a well group coordination coefficient;
γr-well spacing uniformity;
γα-phase distribution uniformity;
the method for specifically evaluating the perfection degree of the injection-production relationship of the well group comprises the following steps:
(1) determining the coordination coefficient gamma of the well groupn：
Wherein: gamma rayn-a well group coordination coefficient;
n is the number of producing wells in the well group;
m is the average ratio of the extraction wells to the injection wells in the block;
(2) determining well spacing uniformity gammar：
Wherein: r isi-the distance between the injection well and each production well in the well group;
δ1-allowed deviation (definable by the actual situation);
wherein: gamma rayr-well spacing uniformity;
a-well group internal satisfaction
Number of producing wells of condition；
n is the number of producing wells in the well group;
(3) phase distribution uniformity gammaα：
γαFor meeting in a well group
The ratio of the number of producing wells for the condition to the total number of producing wells for the well group;
wherein: alpha is alphai-the angle between adjacent production wells in a well group;
δ2-allowed deviation (definable by the actual situation);
wherein: gamma rayα-phase distribution uniformity;
b-well group internal satisfaction
Production well number of conditions;
n is the number of wells produced in the well group.
And selecting a certain injection well, and determining the same injection-production well group according to the minimum distance between the injection well and the adjacent injection well.
Three parameters of well group coordination coefficient, well spacing uniformity and phase distribution uniformity are defined to quantitatively evaluate the perfection degree of the well group injection-production relation.
δ1、δ2In order to allow deviation, the value range is determined to be 0.1-0.3 according to actual conditions.
The invention has the following advantages:
1. the basic data used in the invention is well point coordinates, the data item source is simple, the related parameter items are few, and the practical application is simple and convenient;
2. the invention realizes the rapid identification of a single injection well group;
3. the invention establishes a quantitative evaluation method for the perfection degree of the injection-production relationship of the well group.
Description of the drawings: FIG. 1 is a schematic illustration of a pattern of injection and production well groups; figure 2 is a schematic diagram of the completion of a production-injection well group.
The specific implementation mode is as follows: the invention will be further illustrated with reference to specific examples: selecting a part of wells in a certain block of the oil field, wherein the coordinates of well points are shown in a table 1:
TABLE 1 Block part well Point coordinates and well categories
| Number of well | X coordinate | Y coordinate | Well pin |
| Z1 | 18485.88 | 70879.07 | Injection well |
| Z2 | 18202.24 | 70974.27 | Injection well |
| Z3 | 18675.88 | 70972.13 | Injection well |
| Z4 | 18575.49 | 70710.41 | Injection well |
| C1 | 18533.94 | 71020.8 | Production well |
| C2 | 18343.99 | 70925.98 | Production well |
| C3 | 18159.61 | 70845.95 | Production well |
| C4 | 18429.34 | 70749.12 | Production well |
| C5 | 18627.85 | 70831.17 | Production well |
| C6 | 17841.39 | 70799.08 | Production well |
| C7 | 18109.83 | 70687.9 | Production well |
| C8 | 18721.73 | 71101.11 | Production well |
The first step is as follows: determining injection-production well group
Selecting any one injection well Z1 according to
The distances from Z1 to Z2, Z3, Z4 were calculated, respectively:
TABLE 2 distances from Z1 to Z2, Z3, Z4
| Parameter item | Calculated value |
| Distance R of Z1 → Z21 | 299.19 |
| Distance R of Z1 → Z32 | 211.57 |
| Distance R of Z1 → Z43 | 190.99 |
As can be seen from the results in Table 2, the minimum distance Rmin＝R3190.99, the distance Z1 → Z4. Distance R from injection well Z1minThe producing wells C1, C2, C4, C5 and the injection well Z1 in the circle are drawn as circles with radii in the same injection and production well group as shown in fig. 1.
The second step is that: determining the perfection of injection-production relationship
The average ratio of the production wells to the injection wells in the known blocks is as follows: and m is 4. Calculating the average distance between the injection well and each production well in the block
Average included angle between adjacent production wells in block
Setting an allowable deviation: delta1、δ2Table 3 shows the calculated values for the parameters, as shown in fig. 2, defining the interwell distance and included angle, 0.2.
Table 3 values of known parameters
(1) Coordination coefficient of well group
(2) Uniformity of well spacing
According to the calculation, the following results are obtained:
thus satisfy
The number of producing wells under the conditions is 4, and the well spacing uniformity is as follows:
γr＝4/4＝1
(3) uniformity of phase distribution
According to the calculation, the following results are obtained:
thus satisfy
The number of producing wells under the condition is 4, and the phase distribution uniformity is as follows:
γα＝4/4＝1
the perfection degree of the injection-production relation can be determined according to the calculation result:
γ＝γnγrγα＝1
according to the calculation method, the following steps are known: well group coordination coefficient gammanWell spacing uniformity gammarAnd phase distribution uniformity gammaαThe calculated value ranges from 0 to 1, so the gamma value range of the injection-production relationship perfection degree is more than or equal to 0 and less than or equal to 1, and the higher the gamma value is, the better the injection-production relationship perfection degree is. In the example, gamma is 1, which proves that the injection-production relationship of the Z1 injection-production well group is perfect and can be used as a measure well group.
The above examples demonstrate that: the invention firstly determines the injection-production well group taking each injection well as the center by utilizing the inter-well distance, and then can realize the quantitative evaluation of the perfection degree of the injection-production relationship of the well group by defining three parameters of the coordination coefficient, the well distance uniformity and the phase distribution uniformity of the well group, thereby providing an effective basis for the subsequent optimization measure well group.
Claims (3)
1. A well group injection-production relationship perfection quantitative evaluation method based on a plane is characterized by comprising the following steps: the evaluation method comprises the following steps:
the first step is as follows: determining injection-production well group
Selecting any one of the annotations in the blockInto well ZwDefinition of RnIs ZwDistance to other injection wells within the block:
wherein: rnInjection well ZwDistance to other injection wells within the block;
(x1,y1) Injection well ZwCoordinates of well points;
(x2,y2) -remaining injection well point coordinates within the block;
definition of RminIs RnTo the injection well ZwAs a center of circle, a distance RminDrawing a circle for the radius, the producing well and the injection well Z in the circlewThe same injection well group;
the second step is that: determining the perfection of injection-production relationship
For the same injection-production well group, the coordination coefficient gamma of the well group is definednWell spacing uniformity gammarAnd phase distribution uniformity gammaαCalculating the perfection degree gamma of the injection-production relationship of the quantitative evaluation well group by using the three parameters;
γ＝γnγrγα
wherein: gamma-well group injection-production relation perfection degree;
γn-a well group coordination coefficient;
γr-well spacing uniformity;
γα-phase distribution uniformity;
the method for specifically evaluating the perfection degree of the injection-production relationship of the well group comprises the following steps:
(1) determining the coordination coefficient gamma of the well groupn：
Wherein: gamma rayn-a well group coordination coefficient;
n is the number of producing wells in the well group;
m is the average ratio of the extraction wells to the injection wells in the block;
(2) determining well spacing uniformity gammar：
Wherein: r isi-the distance between the injection well and each production well in the well group;
δ1-allowing for deviations;
wherein: gamma rayr-well spacing uniformity;
a-well group internal satisfaction
Production well number of conditions;
n is the number of producing wells in the well group;
(3) phase distribution uniformity gammaα：
γαFor meeting in a well group
The ratio of the number of producing wells for the condition to the total number of producing wells for the well group;
wherein: alpha is alphai-the angle between adjacent production wells in a well group;
δ2-allowing for deviations;
wherein: gamma rayα-phase distribution uniformity;
b-well group internal satisfaction
Production well number of conditions;
n is the number of wells produced in the well group.
2. The quantitative evaluation method for the perfection degree of the injection-production relation of the well group based on the plane as claimed in claim 1 is characterized in that: and selecting a certain injection well, and determining the same injection-production well group according to the minimum distance between the injection well and the adjacent injection well.
3. The quantitative evaluation method for the perfection degree of the injection-production relation of the well group based on the plane as claimed in claim 1 is characterized in that: delta1、δ2In order to allow deviation, the value range is determined to be 0.1-0.3 according to actual conditions.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747147A (en) * | 2015-03-24 | 2015-07-01 | 中国石油天然气股份有限公司 | Water drive development oil reservoir well pattern injection-production relation determination method |
| CN107851230A (en) * | 2015-06-05 | 2018-03-27 | 雷普索尔有限公司 | The method for generating the production strategy for developing hydrocarbon reservoir in natural environment |
| CN110173252A (en) * | 2019-04-28 | 2019-08-27 | 中国石油天然气股份有限公司 | A kind of encryption method and its evaluation method of horizontal well development gas reservoir well pattern |
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| US7346457B2 (en) * | 2006-03-24 | 2008-03-18 | Schlumberger Technology Corporation | Method for identification of inhibited wells in the mature fields |
| FR2999222B1 (en) * | 2012-12-12 | 2014-12-05 | IFP Energies Nouvelles | METHOD FOR EVALUATING AND SELECTING AN IMPROVED HYDROCARBON RECOVERY STRATEGY FOR FRACTURE TANKS |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747147A (en) * | 2015-03-24 | 2015-07-01 | 中国石油天然气股份有限公司 | Water drive development oil reservoir well pattern injection-production relation determination method |
| CN107851230A (en) * | 2015-06-05 | 2018-03-27 | 雷普索尔有限公司 | The method for generating the production strategy for developing hydrocarbon reservoir in natural environment |
| CN110173252A (en) * | 2019-04-28 | 2019-08-27 | 中国石油天然气股份有限公司 | A kind of encryption method and its evaluation method of horizontal well development gas reservoir well pattern |
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Effective date of registration: 20211217 Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant after: Daqing Oilfield Co.,Ltd. Applicant after: PetroChina Co Ltd Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant before: Daqing Oilfield Co.,Ltd. |
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