CN102041987A - 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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- CN102041987A CN102041987A CN2009102357614A CN200910235761A CN102041987A CN 102041987 A CN102041987 A CN 102041987A CN 2009102357614 A CN2009102357614 A CN 2009102357614A CN 200910235761 A CN200910235761 A CN 200910235761A CN 102041987 A CN102041987 A CN 102041987A
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- oil
- oil pipe
- well
- liquid
- water
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- 239000003129 oil well Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 230000020477 pH reduction Effects 0.000 title abstract description 4
- 238000000034 method Methods 0.000 title abstract description 3
- 230000000630 rising effect Effects 0.000 title description 3
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 238000011010 flushing procedure Methods 0.000 claims abstract description 9
- 210000000481 breast Anatomy 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000002637 fluid replacement therapy Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001965 increasing effect Effects 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 3
- 238000007789 sealing Methods 0.000 abstract 2
- 235000020681 well water Nutrition 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229920001285 xanthan gum Polymers 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
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- Earth Drilling (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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 causes output to descend significantly because of moisture rising; Because reservoir pressure is lower, if adopt conventional acidifying, acidification liquid can be under the pit shaft head of liquid, at first crack or the macropore along water outlet flows to, and can advance earth formation deep by seepage flow, even more the depths makes acid solution can't enter the oil impregnate duct of obstruction to oil-water interfaces, thereby cause that the oil well oil increasing effect is very little, aquifer yield rises by a larger margin; In most cases, produce oil not after the acidifying, big 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 can't be injected, and pressure raises and causes the crack to produce, and the acidifying result not only can not increase oil, causes producing water on the contrary and rises significantly.
Summary of the invention:
The objective of the invention is the part acid solution to be replaced in the oil reservoir with the higher displacement fluid of a certain amount of viscosity (with 0.5% xanthans that is heated to 90 ℃ of dissolvings); Utilize that head of liquid is pressed into oil reservoir with remaining acid solution in the pit shaft; 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 the restriction acid solution enters oil reservoir.Utilize cup packer to set, seal liquid in the oil sets annular space, limit it and enter the stratum, avoid it that acid solution is pressed into earth formation deep.
The oil well water-control oil-increasing acidization tool of the moisture ascent stage of low pressure heterogeneous reservoir of the present invention is: at first with flushing fluid 1 with the pit shaft wash clean that circulates, and be full of sleeve pipe 2; With acidifying liquid 3 for putting in the oil pipe 4 flushing fluid to oil reservoir 5 middle parts; Seated packer 6 replaces acidifying solution in the oil pipes in oil reservoir with high sticking displacement fluid 7, fasten oil pipe gate 8 and sleeve gate 9 reaction certain hours respectively after, aspirate the row of returning with the oil pipe swab.
According to injection pressure size decision for putting what of liquid; As pressure≤7MPa, then 2/3 volume displacement fluid with pit shaft oil pipe volume replaces acidifying liquid, reacts afterwards 3 hours; Acid fracturing power is bigger when annotating, and then 4/5 volume displacement fluid with pit shaft oil pipe volume replaces acidifying liquid, reacts afterwards 3 hours; After treating that pressure is laid down, open well head, following 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 reaching oil-water ratio, following pump completion.
Replace liquid low-pressure, low discharge capacity for putting preliminary treatment liquid with high viscosity, can remove obstruction of perforation eye and part seepage flow duct stops up, after reducing injection pressure, because the high sticking effect that replaces liquid and packer, restriction preliminary treatment liquid enters the deep of infiltration macropore under the pit shaft head of liquid, lure that the main acid of injecting subsequently more enters the oil impregnate duct into, the infiltration duct is linked up in the continuation fingering of control acid solution, when water is produced in restriction, remove the oil impregnate duct and stop up, can aspirate the row of returning at short notice again; Thereby in the moisture rising of control, recover and the raising oil production level.Even the possibility that this method has avoided causing the big volume production water of oil well after the acidifying, measure effect difference to cause oil well to be scrapped.
Description of drawings:
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 sticking displacement fluid 8, oil pipe gate 9, sleeve gate
The specific embodiment
At first use flushing fluid (0.5% clay stabilizer+0.3%8608 activating agent) 1 with 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%, acetate 6-10%, corrosion inhibiter 0.5%-1%, ferrous stability 1%-2%, surfactant 0.3-0.5%) 3 for putting in the oil pipe 4 flushing fluid to oil reservoir 5 middle parts; Seated packer 6 replaces acidifying solution in the oil pipes in oil reservoir with high sticking displacement fluid (with 0.5% xanthans that is heated to 90 ℃ of dissolvings) 7, after fastening oil pipe gate 8 and sleeve gate 9 respectively and reacting certain hours, aspirates the row of returning with the oil pipe swab.
Claims (1)
1. the oil well water-control oil-increasing acidization tool of the moisture ascent stage of low pressure heterogeneous reservoir is characterized in that:
At first with flushing fluid with the pit shaft wash clean that circulates, and be full of sleeve pipe; With acidifying liquid for putting in the oil pipe flushing fluid in the middle part of oil reservoir; Packer set is good, seal oil sets annular space, in oil reservoir, fasten oil pipe gate and sleeve gate reaction 30 minutes-8 hours with the acidifying solution in the high sticking displacement fluid replacement oil pipe respectively, with the oil pipe swab suction row of returning;
When annotating acid fracturing power≤7MPa, then the high sticking displacement fluid of 2/3 volume with pit shaft oil pipe volume replaces acidifying liquid, reacts afterwards 3 hours; When annotating acid fracturing power 〉=7MPa, then the high sticking displacement fluid of 4/5 volume with pit shaft oil pipe volume replaces acidifying liquid, reacts afterwards 3 hours; After treating that pressure is laid down, open well head, following 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 reaching oil-water ratio, following pump completion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910235761.4A CN102041987B (en) | 2009-10-13 | 2009-10-13 | Water-controlling oil-increasing acidification method for oil well in water-containing rising stage of low-pressure heterogeneous oil reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910235761.4A CN102041987B (en) | 2009-10-13 | 2009-10-13 | Water-controlling oil-increasing acidification method for oil well in water-containing rising stage of low-pressure heterogeneous oil reservoir |
Publications (2)
| Publication Number | Publication Date |
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| CN102041987A true CN102041987A (en) | 2011-05-04 |
| CN102041987B CN102041987B (en) | 2014-01-15 |
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| CN200910235761.4A Active CN102041987B (en) | 2009-10-13 | 2009-10-13 | Water-controlling oil-increasing acidification method for oil well in water-containing rising stage of low-pressure heterogeneous oil reservoir |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590803A (en) * | 2012-08-13 | 2014-02-19 | 中国石油天然气股份有限公司 | Solid acid fracturing process method |
| CN103756663A (en) * | 2013-12-17 | 2014-04-30 | 常州大学 | High performance acidizing fracturing fluid and preparation method thereof |
| CN104109527A (en) * | 2013-10-18 | 2014-10-22 | 中国石油化工股份有限公司 | Microemulsified acid solution and preparation method thereof |
| CN109083620A (en) * | 2018-07-10 | 2018-12-25 | 濮阳市华瑞通能源工程技术有限公司 | A kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429963A (en) * | 2001-12-30 | 2003-07-16 | 中国石油天然气股份有限公司 | Water injection well nitric acid powder acid liquor system and acidification process |
| US6935426B1 (en) * | 2003-02-04 | 2005-08-30 | Encana Oil & Gas (Usa) Inc. | System and method for polymer filter cake removal |
| RU2286446C1 (en) * | 2006-01-19 | 2006-10-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Acid well bottom zone treatment method |
| CN101078343A (en) * | 2007-07-06 | 2007-11-28 | 郝东 | Fracturing technique for relieving fracturing fluid pollution |
| CN101089360A (en) * | 2007-07-12 | 2007-12-19 | 西南石油大学 | Well completion method and device of diverticulum with outer packer combined with sieve tube |
| CN101280678A (en) * | 2008-05-09 | 2008-10-08 | 大庆汇联技术开发有限公司 | Oil well chemical gorge and disgorge yield increasing and inverse direction regulating block connection working process |
-
2009
- 2009-10-13 CN CN200910235761.4A patent/CN102041987B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590803A (en) * | 2012-08-13 | 2014-02-19 | 中国石油天然气股份有限公司 | Solid acid fracturing process method |
| CN104109527A (en) * | 2013-10-18 | 2014-10-22 | 中国石油化工股份有限公司 | Microemulsified acid solution and preparation method thereof |
| 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 |
| CN109083620A (en) * | 2018-07-10 | 2018-12-25 | 濮阳市华瑞通能源工程技术有限公司 | A kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water |
| 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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| Publication number | Publication date |
|---|---|
| CN102041987B (en) | 2014-01-15 |
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