CN102041987B - Water-controlling oil-increasing acidification method for oil well in water-containing rising stage of low-pressure heterogeneous oil reservoir - Google Patents
Water-controlling oil-increasing acidification method for oil well in water-containing rising stage of low-pressure heterogeneous oil reservoir Download PDFInfo
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- CN102041987B CN102041987B CN200910235761.4A CN200910235761A CN102041987B CN 102041987 B CN102041987 B CN 102041987B CN 200910235761 A CN200910235761 A CN 200910235761A CN 102041987 B CN102041987 B CN 102041987B
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Abstract
The invention relates to an oil well water control and oil increasing acidification method of a low-pressure heterogeneous oil reservoir, wherein a well bore is cleaned by using a well flushing fluid to fill a casing; replacing the well-flushing liquid in the oil pipe with the acidizing liquid to the middle part of the oil layer; sealing the packer seat well, sealing an annular space of the oil sleeve, replacing acidizing fluid in the oil pipe with high-viscosity displacement fluid to an oil layer, respectively closing an oil pipe gate and a casing pipe gate to react for 30 minutes to 8 hours, and sucking and back-draining by using an oil pipe sucker; when the acid injection pressure is less than or equal to 7MPa, replacing the acidizing liquid with 2/3-volume high-viscosity displacement liquid of the volume of the oil pipe of the shaft, and reacting for 3 hours; when the acid injection pressure is more than or equal to 7MPa, replacing the acidizing liquid with 4/5-volume high-viscosity displacement liquid of the volume of the oil pipe of the shaft, and reacting for 3 hours; after pressure relief, opening the well mouth, pumping and flowback the lower oil pipe pumping barrel, and pumping to 300-500m above the oil layer perforation section from the deepest depth until the oil-water ratio is reached; the possibility that the oil well produces a large amount of water after acidification, the measure effect is poor or the oil well is scrapped is avoided.
Description
Technical field:
The present invention relates to a kind of acidization tool that is applicable to the oil well water-control oil-increasing of low pressure heterogeneous reservoir.
Background technology:
The oil well of low pressure heterogeneous reservoir, because of Water-Content Rise, causes output significantly to decline; Because reservoir pressure is lower, if adopt conventional acidifying, acidification liquid can be under well liquid column pressure, first crack or the macropore along water outlet flows to, and can enter earth formation deep by seepage flow, even more depths to oil-water interfaces, makes acid solution cannot enter the oil impregnate duct of obstruction, thereby cause that oil well oil increasing effect is very little, aquifer yield rises by a larger margin; In most cases, produce oil not after acidifying, large volume production water, causes oil well almost to be scrapped; If, adopt first water blockoff (stifled temporarily) acidifying again, because oil layer blocking is serious, blocking agent cannot be injected, and pressure raises and causes crack to produce, and acidifying result not only can not increase oil, causes on the contrary producing water and significantly rises.
Summary of the invention:
The object of the invention is with the higher displacement fluid of a certain amount of viscosity (with 0.5% xanthans that is heated to 90 ℃ of dissolvings), part acid solution to be replaced in oil reservoir; Utilize head of liquid in pit shaft that remaining acid solution is pressed into oil reservoir; Utilize for the high viscosity of putting acid solution and replace the characteristic that liquid is not easy to enter oil reservoir, thus the deep degree that restriction acid solution enters oil reservoir.Utilize cup packer to set, seal liquid in oil sets annular space, limit it and enter stratum, avoid it that acid solution is pressed into earth formation deep.
The oil well water-control oil-increasing acidization tool in low pressure heterogeneous reservoir Water-Content Rise stage of the present invention is: first with flushing fluid 1 by the pit shaft wash clean that circulates, and be full of sleeve pipe 2; With acidifying liquid 3 for putting in oil pipe 4 flushing fluid to oil reservoir 5 middle parts; Seated packer 6, is fastened respectively after oil pipe gate 8 and sleeve gate 9 reaction certain hours, with the oil pipe swab suction row of returning with the acidifying solution in high sticky displacement fluid 7 replacement oil pipes in oil reservoir.
According to injection pressure size determine for put liquid number; As pressure≤7MPa, with 2/3 volume displacement fluid of pit shaft oil pipe volume, replace acidifying liquid, react afterwards 3 hours; When acid filling pressure is larger, with 4/5 volume displacement fluid of pit shaft oil pipe volume, replace acidifying liquid, react afterwards 3 hours; After pressure is laid down, open well head, lower oil pipe suction cylinder aspirates the row of returning, and suction degree of depth bosom is to the above 300-500m of oil reservoir perforated interval, until reach oil-water ratio, lower pump completion.
By high viscosity, replace liquid low-pressure, low discharge capacity for putting pretreating liquid, can remove the obstruction of perforation eye and part seepage flow duct stops up, after reducing injection pressure, due to the sticky effect that replaces liquid and packer of height, restriction pretreating liquid enters the deep of infiltration macropore under well liquid column pressure, lure that the main acid of injecting subsequently more enters oil impregnate duct into, control the continuation fingering of acid solution and link up infiltration duct, when water is produced in restriction, remove oil impregnate duct and stop up, can aspirate at short notice the row of returning again; Thereby when controlling Water-Content Rise, recover and raising oil production level.Even the method has avoided causing the large volume production water of oil well after acidifying, the poor possibility that causes oil well to be scrapped of measure effect.
Accompanying drawing explanation:
Fig. 1 shaft column structure and liquid distribution schematic diagram:
Wherein: 1, flushing fluid 2, sleeve pipe 3, acidifying liquid 4, oil pipe 5, oil reservoir 6, packer 7, high sticky displacement fluid 8, oil pipe gate 9, sleeve gate
The specific embodiment
First use flushing fluid (0.5% clay stabilizer+0.3%8608 activating agent) 1 by the pit shaft wash clean that circulates, and be full of sleeve pipe 2; With acidifying liquid (hydrochloric acid 8%-10%, hydrofluoric acid 1%-3%, acetic acid 6-10%, corrosion inhibiter 0.5%-1%, ferrous stability 1%-2%, surfactant 0.3-0.5%) 3 for putting in oil pipe 4 flushing fluid to oil reservoir 5 middle parts; Seated packer 6, replaces acidifying solution in oil pipes in oil reservoir with high sticky displacement fluid (with 0.5% xanthans that is heated to 90 ℃ of dissolvings) 7, fastens respectively oil pipe gate 8 and sleeve gate 9 reacts after certain hours, with oil pipe swab, aspirates the row of returning.
Claims (1)
1. the oil well water-control oil-increasing acidization tool in low pressure heterogeneous reservoir Water-Content Rise stage, is characterized in that:
First with flushing fluid by the pit shaft wash clean that circulates, and be full of sleeve pipe; With acidifying liquid for putting in oil pipe flushing fluid in the middle part of oil reservoir; Packer set is good, seal oil sets annular space, with the acidifying solution in high sticky displacement fluid replacement oil pipe, in oil reservoir, fasten respectively oil pipe gate and sleeve gate reaction 30 minutes-8 hours, with the oil pipe swab suction row of returning;
As acid filling pressure≤7MPa, with the high sticky displacement fluid of 2/3 volume of pit shaft oil pipe volume, replace acidifying liquid, react afterwards 3 hours; When acid filling pressure > 7MPa, with the high sticky displacement fluid of 4/5 volume of pit shaft oil pipe volume, replace acidifying liquid, react afterwards 3 hours; After pressure is laid down, open well head, lower oil pipe suction cylinder aspirates the row of returning, and suction degree of depth bosom is to the above 300-500m of oil reservoir perforated interval, until reach oil-water ratio, lower pump completion;
It is 0.5% clay stabilizer and 0.3%8608 activating agent that described flushing fluid contains by volume percentage composition; It is hydrochloric acid 8%-10% that described acidifying liquid contains by volume percentage composition, hydrofluoric acid 1%-3%, acetic acid 6-10%, corrosion inhibiter 0.5%-1%, ferrous stability 1%-2%, surfactant 0.3-0.5%; The sticky displacement fluid of described height is the liquid of the xanthans that is heated to 90 ℃ of dissolvings that contains volumn concentration 0.5%.
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Families Citing this family (4)
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CN103590803B (en) * | 2012-08-13 | 2017-02-15 | 中国石油天然气股份有限公司 | Solid acid fracturing process method |
CN104109527B (en) * | 2013-10-18 | 2017-03-22 | 中国石油化工股份有限公司 | Microemulsified acid solution and preparation method thereof |
CN103756663A (en) * | 2013-12-17 | 2014-04-30 | 常州大学 | High performance acidizing fracturing fluid and preparation method thereof |
CN109083620B (en) * | 2018-07-10 | 2021-03-26 | 濮阳市华瑞通能源工程技术有限公司 | Acidification method for oil well with water injected in crack direction and capable of entering suddenly |
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