CN111396019B - Method for optimizing online acidizing acid liquid consumption of water injection well - Google Patents
Method for optimizing online acidizing acid liquid consumption of water injection well Download PDFInfo
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- CN111396019B CN111396019B CN201910004776.3A CN201910004776A CN111396019B CN 111396019 B CN111396019 B CN 111396019B CN 201910004776 A CN201910004776 A CN 201910004776A CN 111396019 B CN111396019 B CN 111396019B
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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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- 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
Abstract
The invention discloses a method for optimizing the use amount of an on-line acidizing acid solution for a water injection well. The method comprises the following steps: a) determining the permeability of a reservoir of a water injection well to be acidified, and grading the reservoir, wherein different grades correspond to different coefficients A; b) determining the accumulated water injection amount of the water injection well, and grading the water injection well, wherein different grades correspond to different coefficients B; c) determining betting time of a water injection well, and grading the betting time, wherein different grades correspond to different coefficients C; d) determining injection media of the water injection well, wherein different injection media correspond to different coefficients D; e) determining the times of the early-stage accumulative measures of the water injection well, wherein different times correspond to different coefficients E; f) determining an acidification radius r, determining the oil layer thickness h, and determining the reservoir porosity phi; g) establishing an acid injection volume model V (ABCDE) pi phi r2And h, determining the final acid liquor dosage, and carrying out online acidification according to the dosage.
Description
Technical Field
The invention belongs to the technical field of oilfield exploitation, and particularly relates to a method for optimizing the use amount of an on-line acidizing acid liquor of a water injection well.
Background
The acidification technology is one of the oil and gas well production increasing measures widely applied at present, can effectively remove the damage to a reservoir during the well drilling and completion and the production process, and improve the oil and gas yield. The conventional acidification is to inject acid liquor with certain type and concentration and formula acid liquor consisting of additives into a reservoir according to a certain sequence to erode minerals of part of stratum rocks or plugs in pores and cracks, improve the permeability of the stratum or the cracks, improve the seepage conditions and achieve the aim of recovering or improving the productivity of the oil and gas wells.
However, in the conventional acidification construction operation, according to the actual construction requirements on site, the required acid liquor is required to be prepared on site, and then the construction procedures of pre-solution, treatment solution, post-solution and the like are carried out. The current construction process is complex, the site construction conditions are limited, the equipment transportation cost is high, and the labor intensity is high. Therefore, an immovable pipe column online acidification process technology is developed and formed, acid liquid does not need to be prepared on site, the construction process is simple, and the transformation effect is excellent. However, at present, a conventional empirical formula is still used for the acid liquor consumption, the aspects of the well conditions, reservoir characteristics and the like of the water injection well are not considered, and the acid liquor consumption cannot be reasonably given according to the actual conditions of each well.
Disclosure of Invention
In view of the above, the invention provides a method for optimizing the acid liquor consumption in online acidification of a water injection well, which considers factors such as well conditions, water injection time, water injection media, reservoir characteristics, measure times and the like in the online acidification construction process, and finally determines the acid liquor consumption, so that online acidification achieves a better acidification effect, and the recovery ratio is improved.
An online acidizing acid liquid usage optimization method for a water injection well comprises the following steps:
a) determining the permeability of a reservoir of a water injection well to be acidified, and grading the reservoir, wherein different grades correspond to different coefficients A;
b) determining the accumulated water injection amount of the water injection well, and grading the water injection well, wherein different grades correspond to different coefficients B;
c) determining betting time of a water injection well, and grading the betting time, wherein different grades correspond to different coefficients C;
d) determining injection media of the water injection well, wherein different injection media correspond to different coefficients D;
e) determining the times of the early-stage accumulative measures of the water injection well, wherein different times correspond to different coefficients E;
f) determining an acidification radius r, determining the oil layer thickness h, and determining the reservoir porosity phi;
g) establishing an acid injection volume model V (ABCDE) pi phi r2And h, determining the final acid liquor dosage, and carrying out online acidification according to the dosage.
Preferably, in step a), the grading of the permeability and the corresponding coefficient a include: the permeability is 10-50mD, the permeability is hypotonic, and A is 0.8; when the permeability is 1-10mD, the material is ultra-low permeability, and A is 1; when the permeability is 0.3-1.0mD, the ultra-low permeability is achieved, and A is 1.2; at a permeability of <0.3mD, the reservoir is tight, a ═ 1.5.
The accumulated water injection amount is the historical accumulated water injection amount of the water injection well. Preferably, in the step b), the accumulated water injection amount is graded every 5000 parties.
More preferably, in step B), the grading of the cumulative water injection amount and the corresponding train B comprises: the accumulated water injection amount is less than or equal to 5000, and B is 1; the accumulated water injection amount is more than 5000 and less than 10000, and B is 1.05; the accumulated water injection amount is more than or equal to 10000 square and less than 15000 square, and B is 1.1; the accumulated water injection amount is more than or equal to 15000 square and less than 20000 square, and B is 1.15; the accumulated water injection amount is more than or equal to 20000 square and less than 30000 square, and B is 1.2; the accumulated water injection amount is more than or equal to 30000 square, and B is 1.25.
The betting time is the betting age limit, which refers to the historical betting age limit of the well. Preferably, in step C), the ranking of the different betting times and the corresponding line C includes: the betting time is less than 6 months, and the corresponding coefficient C is 0.8; betting time greater than or equal to 6 months and less than 1 year, C ═ 1; betting time is greater than or equal to 1 year and less than 2 years, C is 1.1; betting time greater than or equal to 2 years and less than 4 years, C ═ 1.2; the betting time is more than or equal to 4 years, and C is 1.3.
Preferably, in step D), the different injection media corresponding to different coefficients D include: when the injection medium is clear water, the corresponding coefficient D is 1; when the injection medium is produced water, the corresponding coefficient D is 1.2.
The early-stage accumulated measure times are the accumulated times of measures performed by the water injection well before the online acidification. Including acidizing, acid fracturing, and the like. Preferably, in step E), the step of calculating the number of different previous accumulation measures corresponding to different coefficients E includes: if no measure is taken in the early stage, the corresponding coefficient E is 0.85; if a measure is taken in the early stage, the corresponding coefficient E is 1.0; in the early stage, secondary measures are carried out, and the corresponding coefficient E is 1.1; taking three measures in the early stage, wherein the corresponding coefficient E is 1.2; if the procedure is carried out four times or more in the early stage, the coefficient E is 1.5.
Preferably, in step f), the acidification radius is the acidification radius set by the online acidification, and r is 1.5m-4.0 m; the oil layer thickness is the oil layer thickness h of the construction well; the reservoir porosity phi is the porosity of the construction well.
The online acidizing acid liquid consumption optimization method considers factors such as well conditions, water injection time, water injection media, reservoir characteristics, measure times and the like, and finally determines the acid liquid consumption, so that online acidizing achieves a better acidizing effect, and the recovery ratio is improved.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
The embodiment provides an optimization method for the acid liquor consumption in the online acidification construction process of a water injection well.
The well is an 8-layer water injection well in the oilfield of the highland, has the permeability of 0.56mD and belongs to an ultra-low permeability reservoir; the accumulated water injection amount is 13875 square; the betting time is 1 year and 8 months; the injected medium is clear water; the early stage is not subjected to augmented injection measures; setting the acidification radius to be 3 m; the thickness of the oil layer of the well is 8 meters; the reservoir porosity was 12%.
The well is constructed by on-line acidification according to the volume formula of injected acid V ═ ABCDE (π φ r)2h are calculated. Wherein a is 1.2, B is 1.1, C is 1.1, D is 1, E is 0.85; when Φ is 12%, h is 8, and r is 3, V is 1.2 × 1.1 × 1.1 × 0.85 × 3.14 × 0.12×9×8＝33.48(m3)。
Therefore, the consumption of acid liquor for on-line acidizing construction of the well is 33.5.
After the well is subjected to online acidizing construction, the water injection pressure is reduced to 16.2MPa from 21.5MPa before measures, the daily water injection amount is increased to 25 from 2, the injection allocation requirement is met, the purposes of reducing pressure and increasing injection are achieved, and the effect is good.
Example 2
The embodiment provides an optimization method for the acid liquor consumption in the online acidification construction process of a water injection well.
The well is a Jingan oil field long 2-layer water injection well, the permeability of the well is 10.2mD, and the well belongs to a low-permeability reservoir; the accumulated water injection amount is 25875 square; the betting time is 3 years and 2 months; the injection medium is produced water; 2 times of injection increasing measures are carried out in the early stage; setting the acidification radius to be 2.5 m; the thickness of the oil layer of the well is 10 meters; the reservoir porosity was 16%.
The well is planned to be subjected to on-line acidizing construction, and an injection acid volume formula V ═ ABCDE (ABCDE) pi phi r is adopted according to the invention2h are calculated. Wherein a is 0.8, B is 1.2, C is 1.2, D is 1.2, E is 1.1; when phi is 16%, h is 10, r is 2.5, V is 0.8 × 1.2 × 1.2 × 1.2 × 1.1 × 3.14 × 0.16 × 6.25 × 10, 47.75(m is 16%3)。
Therefore, the consumption of acid liquor for on-line acidification construction of the well is 47.75.
After the well is subjected to online acidizing construction, the water injection pressure is reduced to 18.8MPa from 22.5MPa before measures, the daily water injection amount is increased to 35 from 3, the injection allocation requirement is met, the purposes of reducing the pressure and increasing the injection are achieved, and the effect is good.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (2)
1. An online acidizing acid liquor usage optimization method for a water injection well is characterized by comprising the following steps:
a) determining the permeability of a reservoir of a water injection well to be acidified, and grading the reservoir, wherein different grades correspond to different coefficients A;
the permeability is 10-50mD, the permeability is hypotonic, and A is 0.8; when the permeability is 1-10mD, the film is ultra-low permeability, and A is 1; when the permeability is 0.3-1.0mD, the ultra-low permeability is achieved, and A is 1.2; when the permeability is less than 0.3mD, the reservoir is compact, and A is 1.5;
b) determining the accumulated water injection amount of the water injection well, and grading the water injection well, wherein different grades correspond to different coefficients B;
the accumulated water injection amount is less than or equal to 5000, and B is 1; the accumulated water injection amount is more than 5000 and less than 10000, and B is 1.05; the accumulated water injection amount is more than or equal to 10000 square and less than 15000 square, and B is 1.1; the accumulated water injection amount is more than or equal to 15000 square and less than 20000 square, and B is 1.15; the accumulated water injection amount is more than or equal to 20000 power and less than 30000 power, and B is 1.2; the accumulated water injection amount is more than or equal to 30000, and B is 1.25;
c) determining betting time of a water injection well, and grading the betting time, wherein different grades correspond to different coefficients C;
the betting time is less than 6 months, and the corresponding coefficient C is 0.8; betting time greater than or equal to 6 months and less than 1 year, C ═ 1; betting time is greater than or equal to 1 year and less than 2 years, C is 1.1; betting time greater than or equal to 2 years and less than 4 years, C ═ 1.2; the betting time is more than or equal to 4 years, and C is 1.3;
d) determining injection media of the water injection well, wherein different injection media correspond to different coefficients D;
when the injection medium is clear water, the corresponding coefficient D is 1; when the injection medium is produced water, the corresponding coefficient D is 1.2;
e) determining the times of the early-stage accumulative measures of the water injection well, wherein different times correspond to different coefficients E;
if no measure is taken in the early stage, the corresponding coefficient E is 0.85; if a measure is taken in the early stage, the corresponding coefficient E is 1.0; in the early stage, secondary measures are carried out, and the corresponding coefficient E is 1.1; taking three measures in the early stage, wherein the corresponding coefficient E is 1.2; taking four or more measures in the early stage, wherein the corresponding coefficient E is 1.5;
f) determining an acidification radius r, determining the thickness h of an oil layer, and determining the porosity phi of a reservoir;
g) establishing an acid injection volume model V (ABCDE) pi phi r2And h, determining the final acid liquor dosage, and carrying out online acidification according to the dosage.
2. The method for optimizing the acid liquor dosage for online acidification of the water injection well according to claim 1, wherein in the step f), the acidification radius r is 1.5m-4.0 m.
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| CN112983386B (en) * | 2021-02-25 | 2023-06-30 | 中国石油天然气股份有限公司 | Method and device for determining dosage of head liquid |
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| CN104453812A (en) * | 2014-11-07 | 2015-03-25 | 赵金树 | Method for acid stimulation after carbon dioxide huffing-puffing |
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| CN101781982A (en) * | 2010-02-25 | 2010-07-21 | 中国石油化工股份有限公司 | Short-injection water injection well acidation injectivity process |
| CN106555579A (en) * | 2017-01-01 | 2017-04-05 | 陕西海山能源发展有限公司 | A kind of oil-water well fixed tubular column acidification technique system |
| CN107066769A (en) * | 2017-06-09 | 2017-08-18 | 西南石油大学 | Suitable for the efficient acidifying design method of ultra deep slit formation carbonate reservoir |
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