CN109083620A - A kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water - Google Patents
A kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water Download PDFInfo
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- CN109083620A CN109083620A CN201810748274.7A CN201810748274A CN109083620A CN 109083620 A CN109083620 A CN 109083620A CN 201810748274 A CN201810748274 A CN 201810748274A CN 109083620 A CN109083620 A CN 109083620A
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- acid
- thickening
- fluid
- viscous
- displacement fluid
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
Abstract
The invention belongs to oil well acidation technical fields, and in particular to a kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water.Include the following steps: to be recycled pit shaft well-flushing with flushing fluid to clean；Huge discharge injects viscous acid pretreatment fluid；Sleeve gate is fastened, is then set viscous acid pretreatment fluid using thickening displacement fluid；Closing well reacts 2 hours；Sleeve gate is opened, is filled pit shaft with thickening displacement fluid；Retaining sleeve gate opens wide, and squeezes into viscous acid main process task liquid then for thickening displacement fluid is set, is continuously injected into viscous acid main process task liquid；Injection thickening displacement fluid；Closing well reacts 3 hours；Aspirate the row of returning.Acidization tool provided by the invention improves the success rate of well stimulation, improves the oil increasing effect of restricting water supply of measure, improves stimulation amplitude and extends the validity period of measure.
Description
Technical field
The invention belongs to oil well acidation technical fields, and in particular to a kind of for the oil well advanced by leaps and bounds along fractuer direction injection water
Acidization tool.
Background technique
Acidification is a kind of effective stimulation of well, it can effectively release formation blockage, improves oil well output.?
It brings in early period, since there are the heterogeneity row on stratum, reservoir properties are poor, and there are the oil testing and fractures of early period, therefore
Containing more crack, cause water injection profile and production profile extremely uneven.
Due to the presence in crack, cause nearly well band reservoir heterogeneity very strong, that is, injection treatment fluid is easy to edge
Crack enters, and treatment fluid hardly enters the main oil storage of the fracture surface two sides of blocking, seepage channel, so the journey of acidification de-plugging
Satisfactory result is not achieved in degree, oil increasing effect, validity period；The presently preferred yield-increasing technology suitable for such oil well
It is exactly work-in-progress control technology or water blockoff Acidizing Technology.Work-in-progress control technology is the oil-soluble temporary plugging agent using variable grain size,
Before injection is acidified host agent, first diverting agent is injected, reduces the physical size in crack by the diverting agent deposition of injection to rise
To the ability of fluid flowing is reduced, to play the amount that treatment fluid is flowed along fractuer direction that reduces, force treatment fluid to crack side
To flowing, acidification and oil increasing effect are improved, still, the height extended due to the of different sizes of crack of different oil reservoirs, vertical, horizontal
Degree, distance are different, so, selection and the performance evaluation difficulty for carrying out diverting agent are larger, and specific aim is poor, leads to work-in-progress control skill
Success rate of the art in application is lower, and oil increasing effect of restricting water supply is limited；Water blockoff Acidizing Technology used at present, it is same because in oil reservoir
The difference in crack causes the specific aim of water shutoff agent to have some limitations, and leads to success of the water blockoff Acidizing Technology in application
Rate is relatively low, and oil increasing effect of restricting water supply is limited certain limitation.And it is carried out with conventional oil well acidation technology for such oil well
Acidification success rate, the oily amplitude of increasing are lower, and the validity period of measure is shorter, and even, considerable oil well causes aqueous big after acidification
Amplitude is further up or water logging, and oil well is caused to scrap.
Summary of the invention
It is a kind of for along fractuer direction injection water it is an object of the invention to provide aiming at the problems existing in the prior art
The acidization tool for the oil well advanced by leaps and bounds, the acidization tool improve the success rate of well stimulation, improve the oil increasing effect of restricting water supply of measure, mention
High stimulation amplitude and the validity period for extending measure.
The technical scheme is that
A kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, includes the following steps: one, uses flushing fluid
Pit shaft well-flushing is recycled to clean；Two, huge discharge injects viscous acid pretreatment fluid；Three, the viscous acid pretreatment fluid arrival injected is penetrated
More than hole section at 300 meters, keeps perforated interval and nearby there is in oil reservoir viscous acid pretreatment fluid, fasten sleeve gate, then make
With less than one times flow line volume 2m3Thickening displacement fluid viscous acid pretreatment fluid is set to the above 300m of perforated interval and processing half
At diameter 0.2m；Four, closing well reacts 2 hours；Sleeve gate is opened, pit shaft is filled with thickening displacement fluid, gas in casing is replaced
It sets clean until all thickening displacement fluids of cannula exit；Six, retaining sleeve gate opens wide, and then squeezes into viscous acid main process task
Liquid is for thickening displacement fluid is set, when the amount of injection viscous acid main process task liquid is greater than flow line volume 5m3When, sleeve gate is fastened, continuously
Viscous acid main process task liquid is injected, perforated interval is kept and nearby there is in oil reservoir viscous acid main process task liquid；Seven, injection thickening replaces
Liquid, less than one times flow line volume 3m of amount of injection thickening displacement fluid3When stop；Eight, closing well reacts 3 hours；Nine, the row of returning is aspirated,
Acidification raffinate is pumped out and carries out the row of returning thoroughly.
Specifically, the main constituents of the flushing fluid are 0.5%AES, 1% potassium chloride and 1 ℅ by weight
HEDP, remaining is water.
Specifically, the main component of the viscous acid pretreatment fluid is by weight are as follows: 0.5% polypropylene acid, 0.5%
HEDP, 10% hydrochloric acid, 3% phosphoric acid, 2%HF, 1% acidification corrosion inhibitor, 0.5%AES, 2% potassium chloride and 1% citric acid, remaining
For water, viscosity >=50mPa.s of the viscous acid pretreatment fluid.
Specifically, the main component of the thickening displacement fluid is by weight are as follows: the cruel amine of 0.3% polypropylene, 1% chlorination
Potassium, 2% phosphoric acid and 0.5%AES, remaining is water, viscosity >=50mPa.s of the thickening displacement fluid.
Specifically, the main component of the thickening main process task liquid be by weight 0.5% polyacrylic acid, 8% hydrochloric acid,
It 4%HF, 3% formic acid, 3% acetic acid, 2% phosphoric acid, 1% corrosion inhibiter, 3% potassium chloride, 1%HEDP, 1% citric acid and O.5% breaks
Emulsion, remaining is water, viscosity >=50mPa.s of the thickening main process task liquid.
Specifically, huge discharge refers to the injection rate greater than 500 public assorted/minute in the step two.
The beneficial effects of the present invention are: preventing, limiting well head pressure and fluid column pressure by the viscosity for improving pretreatment fluid
It is mobile to earth formation deep to push dynamic pretreatment fluid, the high reaction speed of viscosity is slow, slows down pretreatment fluid to infiltration fissure channel
Physical size further expansion, furthermore viscosity itself can be made to increase severely since tackifier (EAB) are reacted with bivalent metal ion, therefore meeting
Further limitation pretreatment fluid is flowed to the crack depths of infiltration.The present invention is by injecting main acid front exhaust technique, substantially
Degree reduces influence of the compressibility of gas to design metering, main acid accurately can be pumped into design position, to make main process task sour
The blocking for causing oil productive capacity in oil reservoir is effectively released, de-plugging efficiency and measure effect are improved.
Specific embodiment
A kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, includes the following steps: one, uses flushing fluid
Pit shaft well-flushing is recycled to clean；Two, huge discharge injects viscous acid pretreatment fluid, and huge discharge refers to the note greater than 500 public assorted/minute
Enter amount, principle is the tamper blocked on the tamper and crack side of perforation eye by acid dissolution, reduces the main place of viscous acid
It manages liquid injection pressure and improves acidification liquid to the amount laterally injected, viscous acid is reduced and limited due to viscosity with higher
The amount and speed that viscous acid pretreatment fluid and viscous acid main process task liquid processed enter along crack；Three, the viscous acid pretreatment fluid injected
It reaches at 300 meters of perforated interval or more, keep perforated interval and nearby there is in oil reservoir viscous acid pretreatment fluid, fasten sleeve gate,
Then less than one times flow line volume 2m is used3Thickening displacement fluid by viscous acid pretreatment fluid for set the above 300m of perforated interval and
At treatment radius 0.2m, the effect for being thickened displacement fluid is liquid of the limitation after thickening displacement fluid in well head pressure and fluid column
Under pressure effect, viscous acid is pushed into deeper oil reservoir along crack, to avoid further being acidified water outlet crack, reduction contains
Water is further up；Four, closing well reacts 2 hours；Five, sleeve gate is opened, is filled pit shaft with viscous acid displacement fluid, by casing
Middle gas is clean up to all viscous acid displacement fluids of cannula exit guarantee low-kappa number with the exhaust of viscous acid displacement fluid for setting
Liquid arrives design position by note by design, improves acidizing effect；Six, retaining sleeve gate opens wide, and then squeezes into the main place of viscous acid
Reason liquid is for viscous acid displacement fluid is set, when the amount of injection viscous acid main process task liquid is greater than flow line volume 5m3When, sleeve gate is fastened,
It is continuously injected into viscous acid main process task liquid, keep perforated interval and nearby there is in oil reservoir viscous acid main process task liquid；Seven, injection thickening top
For liquid, less than one times flow line volume 3m of amount of injection thickening displacement fluid3When stop；Eight, closing well reacts 3 hours；Nine, suction is returned
Acidification raffinate is pumped out and carries out the row of returning thoroughly by row, and the row of returning thoroughly, reduces ginseng acid and further migrates along crack, reduce water outlet
Degree, reduce pollution of the secondary injury to stratum.
The main constituents of the flushing fluid are 0.5%AES, 1% potassium chloride and 1 ℅ HEDP by weight, remaining
For water.The main component of the viscous acid pretreatment fluid is by weight are as follows: 0.5% polypropylene acid, 0.5%HEDP, 10% salt
Acid, 3% phosphoric acid, 2%HF, 1% acidification corrosion inhibitor, 0.5%AES, 2% potassium chloride and 1% citric acid, remaining is water, described
Viscosity >=50mPa.s of viscous acid pretreatment fluid.The main component of the thickening displacement fluid is by weight are as follows: 0.3% poly- third
The cruel amine of alkene, 1% potassium chloride, 2% phosphoric acid and 0.5%AES, remaining is water, viscosity >=50mPa.s of the thickening displacement fluid.
The main component of the thickening main process task liquid is 0.5% polyacrylic acid, 8% hydrochloric acid, 4%HF, 3% formic acid, 3% by weight
Acetic acid, 2% phosphoric acid, 1% corrosion inhibiter, 3% potassium chloride, 1%HEDP, 1% citric acid and O.5% demulsifier, remaining is water, described
Thickening main process task liquid viscosity >=50mPa.s.
During viscous acid pretreatment fluid is for setting, viscous acid pretreatment fluid makes to be thickened to the above 300m of perforated interval, purpose
Low-kappa number liquid is thorough by perforated interval and nearby processing, increases measure degree for the treatment of, improves measure effect；And pretreatment is replaced
Liquid dosage reduces 2m3, or the thickening displacement fluid dosage for replacing viscous acid main process task liquid is reduced 3m3, and purpose is in viscous acid
When pretreatment fluid or viscous acid main process task liquid react, viscous acid pretreatment fluid or the main place of viscous acid in perforated interval and are nearby maintained
Liquid is managed, can guarantee that perforated interval, perforation eye and perforated interval nearly well oil reservoir duct, which are handled thoroughly restricting water supply for raising measure, increases the width of oil
Degree and validity period, increase the economic benefit of measure.
And conventional processing method is, when replacing pretreatment fluid or main process task liquid, displacement fluid dosage is equal to flow line volume
(from well head to the oil pipe inner volume of tubing string end), in this case, pretreatment fluid or main process task liquid can be in inlet pressures and fluid column
It under the action of pressure, is promoted to earth formation deep, causes to be the liquid without acid in perforated interval and nearly well oil reservoir hole, thus substantially
Degree reduces treatment fluid to the dissolution rate of tamper in perforated interval and neighbouring oil reservoir, because these positions directly affect the production of oil well
Amount, therefore can recover greatly reduces success rate, treatment effect and the validity period of the measure of processing of acidification.
It can be seen that the relatively conventional existing acidization tool acidizing effect of acidization tool provided by the invention more preferably and, have
The success rate for improving well stimulation improves the oil increasing effect of restricting water supply of measure, improves stimulation amplitude and extends the effective of measure
The effect of phase.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (6)
1. a kind of acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, which comprises the steps of:
One, pit shaft well-flushing is recycled to clean with flushing fluid；
Two, huge discharge injects viscous acid pretreatment fluid；
Three, the viscous acid pretreatment fluid injected reaches at 300 meters of perforated interval or more, keeps perforated interval and nearby in oil reservoir with thick
Change low-kappa number liquid, fastens sleeve gate, then use less than one times flow line volume 2m3Thickening displacement fluid viscous acid is located in advance
Reason liquid, which replaces, to be set at the perforated interval above 300m and treatment radius 0.2m；
Four, closing well reacts 2 hours；
Five, sleeve gate is opened, is filled pit shaft with thickening displacement fluid, gas in casing is set clean until cannula exit is complete
Portion is thickening displacement fluid；
Six, retaining sleeve gate opens wide, and then squeezes into viscous acid main process task liquid for thickening displacement fluid is set, as injection viscous acid master
The amount for the treatment of fluid is greater than flow line volume 5m3When, fasten sleeve gate, be continuously injected into viscous acid main process task liquid, keep perforated interval and
Nearby there is in oil reservoir viscous acid main process task liquid；
Seven, injection thickening displacement fluid, less than one times flow line volume 3m of amount of injection thickening displacement fluid3When stop；
Eight, closing well reacts 3 hours；
Nine, the row of returning is aspirated, acidification raffinate is pumped out and carries out the row of returning thoroughly.
2. according to claim 1 for the acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, which is characterized in that institute
The main component for the flushing fluid stated is by weight are as follows: 0.5%AES, 1% potassium chloride and 1 ℅ HEDP, remaining is water.
3. according to claim 1 for the acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, which is characterized in that institute
The main component for the viscous acid pretreatment fluid stated is by weight are as follows: 0.5% polypropylene acid, 0.5%HEDP, 10% hydrochloric acid, 3%
Phosphoric acid, 2%HF, 1% acidification corrosion inhibitor, 0.5%AES, 2% potassium chloride and 1% citric acid, remaining is water, the viscous acid
Viscosity >=50mPa.s of pretreatment fluid.
4. according to claim 1 for the acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, which is characterized in that institute
The main component for the thickening displacement fluid stated is by weight are as follows: the cruel amine of 0.3% polypropylene, 1% potassium chloride, 2% phosphoric acid and 0.5%
AES, remaining is water, viscosity >=50mPa.s of the thickening displacement fluid.
5. according to claim 1 for the acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, which is characterized in that institute
The main component for the thickening main process task liquid stated is by weight are as follows: 0.5% polyacrylic acid, 8% hydrochloric acid, 4%HF, 3% formic acid,
3% acetic acid, 2% phosphoric acid, 1% corrosion inhibiter, 3% potassium chloride, 1%HEDP, 1% citric acid and O.5% demulsifier, remaining is water,
Viscosity >=50mPa.s of the thickening main process task liquid.
6. according to claim 1 for the acidization tool for the oil well advanced by leaps and bounds along fractuer direction injection water, which is characterized in that institute
Huge discharge refers to the injection rate greater than 500 public assorted/minute in the step of stating two.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810748274.7A CN109083620B (en) | 2018-07-10 | 2018-07-10 | Acidification method for oil well with water injected in crack direction and capable of entering suddenly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810748274.7A CN109083620B (en) | 2018-07-10 | 2018-07-10 | Acidification method for oil well with water injected in crack direction and capable of entering suddenly |
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| CN109083620A true CN109083620A (en) | 2018-12-25 |
| CN109083620B CN109083620B (en) | 2021-03-26 |
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| US4578201A (en) * | 1984-03-05 | 1986-03-25 | Phillips Petroleum Company | N-vinyl lactam/unsaturated amide copolymers in thickened acid compositions |
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| CN103953324A (en) * | 2014-04-29 | 2014-07-30 | 惠建龙 | Fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid |
| CN104653164A (en) * | 2013-11-22 | 2015-05-27 | 中国石油天然气股份有限公司 | Water-controlling blockage removing and yield increasing method for oil well of low-pressure bottom water oil reservoir |
| CN104910037A (en) * | 2015-06-02 | 2015-09-16 | 中国石油天然气股份有限公司 | Preparation method of amide surface-active acid thickener |
| CN104975840A (en) * | 2015-06-18 | 2015-10-14 | 中国石油化工股份有限公司 | Self-born acid composite acid fracturing process for high-temperature deep well carbonate rock reservoir |
-
2018
- 2018-07-10 CN CN201810748274.7A patent/CN109083620B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4578201A (en) * | 1984-03-05 | 1986-03-25 | Phillips Petroleum Company | N-vinyl lactam/unsaturated amide copolymers in thickened acid compositions |
| CN102041987A (en) * | 2009-10-13 | 2011-05-04 | 中国石油天然气股份有限公司 | Method for water control and oil production increasing acidification of oil well at water content increasing stage of low-pressure heterogeneous reservoir |
| CN104653164A (en) * | 2013-11-22 | 2015-05-27 | 中国石油天然气股份有限公司 | Water-controlling blockage removing and yield increasing method for oil well of low-pressure bottom water oil reservoir |
| CN103953324A (en) * | 2014-04-29 | 2014-07-30 | 惠建龙 | Fracture height-adjustable acid fracturing method adopting polyatomic acid and steering acid |
| CN104910037A (en) * | 2015-06-02 | 2015-09-16 | 中国石油天然气股份有限公司 | Preparation method of amide surface-active acid thickener |
| CN104975840A (en) * | 2015-06-18 | 2015-10-14 | 中国石油化工股份有限公司 | Self-born acid composite acid fracturing process for high-temperature deep well carbonate rock reservoir |
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Address after: No. 08 East Road, 50 meters south of the intersection of Subei Road and Xindong Road, Puyang City, Henan Province, 457001 Patentee after: Henan Ruitong Energy Engineering Technology Co.,Ltd. Address before: 457000 North Road, 200m east of the intersection of Wuyi Road and Wenming Road, Puyang City, Henan Province Patentee before: PUYANG HUARUITONG ENERGY ENGINEERING TECHNOLOGY Co.,Ltd. |