CN110454123A - A kind of more wells collaboration energizations of LOW PERMEABILITY RESERVOIR are handled up method - Google Patents
A kind of more wells collaboration energizations of LOW PERMEABILITY RESERVOIR are handled up method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000035699 permeability Effects 0.000 title claims abstract description 34
- 239000003129 oil well Substances 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- 238000010276 construction Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 10
- 230000006735 deficit Effects 0.000 claims abstract description 10
- 238000009533 lab test Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000000704 physical effect Effects 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 15
- 239000011229 interlayer Substances 0.000 claims description 13
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- 239000000243 solution Substances 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000007790 scraping Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 4
- 230000016615 flocculation Effects 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 38
- 239000012530 fluid Substances 0.000 description 8
- 238000011161 development Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000013589 supplement Substances 0.000 description 5
- 238000012797 qualification Methods 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
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- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- MPNXSZJPSVBLHP-UHFFFAOYSA-N 2-chloro-n-phenylpyridine-3-carboxamide Chemical compound ClC1=NC=CC=C1C(=O)NC1=CC=CC=C1 MPNXSZJPSVBLHP-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
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- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
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- 229920001577 copolymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 239000003381 stabilizer Substances 0.000 description 1
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- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
- E21B43/20—Displacing by water
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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Abstract
It handles up method the invention discloses a kind of LOW PERMEABILITY RESERVOIR more wells collaboration energizations, comprising steps of the first step, according to well net deployment, preferred a bite well and at least a bite oil well in the same well group；Second step determines well and oil well injection rate according to the well group deficit amount；Third step is preferably injected technique according to oil well and well target zone physical property characteristic and hole condition；4th step, according to laboratory test, preferably well injects liquid system；5th step, is preferably injected mode；6th step, the pit shaft before completing construction prepare；7th step, while pressure break water filling is carried out to well and oil well, with well group offset well whole closing well and pressure gauge is installed；8th step, after the completion of construction, oil well and well keep closing well state, corresponding oil well and surrounding offset well according to pressure change, to select well opening time.The present invention overcomes the shortage of prior art, and can effectively solve the problem of stratum energy caused by existing LOW PERMEABILITY RESERVOIR difficult water injection cannot be supplemented timely and effectively.
Description
Technical field
The present invention relates to Reservoir Development technical fields, cooperate with the energization side of handling up more particularly to a kind of more wells of LOW PERMEABILITY RESERVOIR
Method.
Background technique
Currently, for LOW PERMEABILITY RESERVOIR, in order to improve reserves exploitation degree, using pattern flooding development plan, a well group
It simultaneously include water injection well (being also well) and producing well (being also oil well).Wherein, water injection well is responsible for supplementing stratum energy, drives simultaneously
Alternately the crude oil in layer is to oil well direction seepage.Oil well provides seepage channel for in-place oil, and oil extraction is come out.
But this pattern flooding development plan, there are two aspects: first is that injection pressure gradually rises
Height, causes well difficult water injection, and well group stratum energy cannot supplement；On the other hand, by between water injection well and the well of producing well
The limitation of connectivity and stratum flow conductivity, water filling is unobvious by imitating, and cannot be formed between water injection well and producing well effective
Displacement.In order to solve water filling problem, mainly increased at present using conventional measures such as seperated layer water injection, pressure break, acidifications on water injection technology
Note.These measures make water injection well be able to satisfy the requirement of injection allocation in a short time, but after measure validity period, it is generally existing
The problem of flow conductivity is deteriorated, difficult water injection, not can effectively solve the problem that stratum energy cannot supplement.Even result in portion
Even if after point well group measure, water injection well restores water filling, the ineffective problem of flushing is still suffered from.
It can be seen that current existing process existing defects, it would be highly desirable to improve.
Summary of the invention
The purpose of the present invention is being directed to technical problem of the existing technology, a kind of more well collaboration energizations of LOW PERMEABILITY RESERVOIR are provided
It handles up method.
For this purpose, handling up method the present invention provides kind of LOW PERMEABILITY RESERVOIR more wells collaboration energizations, comprising the following steps:
The first step, according to well net deployment, preferred a bite well and at least a bite oil well in the same well group；
Second step determines well and oil well injection rate according to the well group deficit amount；
Third step is preferably injected technique according to oil well and well target zone physical property characteristic and hole condition；
4th step, according to laboratory test, preferably well injects liquid system；
5th step, is preferably injected mode；
6th step, the pit shaft before completing construction prepare；
7th step, while pressure break water filling is carried out to well and oil well, with well group offset well whole closing well and pressure gauge is installed；
8th step, after the completion of construction, oil well and well keep closing well state, corresponding oil well and surrounding offset well according to
Pressure change, to select well opening time.
Wherein, in the first step, preferred well, which refers to, is preferably placed at well pattern center or is benefited in a well group
Well more than well；
Preferred oil well refers to that the oil well in region major fracture orientation is avoided in orientation as far as possible.
Wherein, well group deficit amount is the sum of the injection rate of well and oil well；
Oil well injection rate is 10,000 sides/mouth, and well injection rate is the difference of well group deficit amount and oil well injection rate.
Wherein, third step specifically:
If maximum interlayer coefficient of variation≤2, using conjunction note technique, and if maximum interlayer coefficient of variation > 2, selection layering
Injection technology；
Wherein, maximum interlayer coefficient of variation refers to the ratio k 1*h1/k2*h2 of two different substratum formation capacities；
Wherein, k1 refers to the effective permeability of first substratum, and h1 refers to the effective thickness of oil reservoir in first substratum, k2
Refer to the effective permeability of second substratum, h2 refers to the effective thickness of oil reservoir in second substratum.
Wherein, in the 4th step, in specific implementation, specifically includes the following steps:
Firstly, taking the water sample at water source to be implanted, it is desirable that friction reducer and water source compatibility are good, no to precipitate, without flocculation；
Then, expansion-resisting agent, friction reducer and water are uniformly mixed according to 1,0.1,98.9 mass ratio and form aqueous solution, it is right
The aqueous solution carries out laboratory experiment, it is desirable that core damage rate≤30%, landwaste anti-dilative >=85% are final to obtain what needs injected
Slippery water.
Wherein, in the 5th step, in specific implementation, injection mode includes that oil pipe feed liquor, oil jacket are infiltrated and casing feed liquor three
Kind mode；
Wherein, if measure time interval completion time > 3 years of oil well and well, select oil pipe feed liquor, and if oil well and water
Well measure time interval completion time≤3 year, selection oil jacket is infiltrated or the mode of casing feed liquor.
Wherein, in step 6, pit shaft preparation includes: and successively carries out well-flushing according to well control requirement, kill-job, leads to before constructing
Set, pressure testing are tested in well, scraping, are then changed the outfit and production tree and are reinforced well head.
Wherein, in step 6, it after reinforcing well head, also adds wirerope and uses earth anchorage.
By the above technical solution provided by the invention as it can be seen that compared with prior art, the present invention provides a kind of hypotonic
Oil reservoir more wells collaboration energizations are handled up method, and which overcome above-mentioned prior art shortcomings, can effectively solve existing LOW PERMEABILITY RESERVOIR
Difficult water injection (as note not into) caused by stratum energy cannot timely and effectively supplement the problem of, anticipate with great practice
Justice.
The method in addition, the more well collaboration energizations of a kind of LOW PERMEABILITY RESERVOIR provided by the invention are handled up, additionally it is possible to effectively solve hypotonic
The ineffective problem of flushing in oil reservoir.
Detailed description of the invention
Fig. 1 is that a kind of more wells of LOW PERMEABILITY RESERVOIR provided by the invention cooperate with energizations to handle up the flow chart of method.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing with embodiment to this
Invention is described in further detail.
Referring to Fig. 1, handle up method the present invention provides a kind of more wells collaboration energizations of LOW PERMEABILITY RESERVOIR, this method be by seepage flow,
A kind of new method that measures to reform and water filling combine, specifically includes the following steps:
The first step, according to well net deployment, preferred a bite well and at least a bite oil well in the same well group；
In the first step, in specific implementation, preferred well, which refers to, is preferably placed at well pattern center in a well group
Or the well more than benefited well；
Preferred oil well refers to that the oil well in region major fracture orientation is avoided in oil-water well (including oil well and well) orientation as far as possible.
Second step determines well and oil well (an i.e. preferred well and an oil well) note according to the well group deficit amount
Enter amount；
In second step, in specific implementation, well group deficit amount is the sum of the injection rate of well and oil well.
In specific implementation, for well group injection rate, wherein oil well injection rate is 10,000 sides/mouth, and well injection rate is lost for well group
The difference of sky amount and oil well injection rate.
Third step is preferably injected technique according to oil well and well (i.e. oil-water well) target zone physical property characteristic and hole condition；
In specific implementation, third step specifically:
If maximum interlayer coefficient of variation≤2, using conjunction note technique, and if maximum interlayer coefficient of variation > 2, selection layering
Injection technology；
Wherein, maximum interlayer coefficient of variation refers to that two different substratums (specifically can be the first ground as different substratums
Layer and the second stratum) formation capacity ratio k 1*h1/k2*h2 (i.e. maximum/minimum), k refers to effective infiltration on stratum
Rate, h refer to the effective thickness of oil reservoir,
Wherein, k1 refers to the effective permeability of first substratum, and h1 refers to the effective thickness of oil reservoir in first substratum, k2
Refer to the effective permeability of second substratum, h2 refers to the effective thickness of oil reservoir in second substratum.
It should be noted that formation capacity is equal to the product between effective thick and effective permeability on stratum of oil reservoir；
It should be noted that substratum refers to: the oil-gas Layer separated up and down for impervious bed in Sand member divides into one small
Layer.
4th step, according to laboratory test, preferably well injects liquid system；
In the 4th step, in specific implementation, specifically includes the following steps:
Firstly, taking the water sample at water source to be implanted, it is desirable that friction reducer and water source compatibility are good, no to precipitate, without flocculation；
Then, expansion-resisting agent, friction reducer and water are uniformly mixed according to 1,0.1,98.9 mass ratio and form aqueous solution, it is right
The aqueous solution carries out laboratory experiment, it is desirable that core damage rate≤30%, landwaste anti-dilative >=85% are final to obtain what needs injected
Slippery water (i.e. liquid system).
In specific implementation, friction reducer is polyacrylamide.
In specific implementation, expansion-resisting agent is a kind of clay stabilizer of organic polymer, is acrylamide and ethyl acrylate
The copolymer of trimethyl ammonium chloride.
5th step, is preferably injected mode；
In the 5th step, in specific implementation, injection mode includes that oil pipe feed liquor, oil jacket are infiltrated and three kinds of sides of casing feed liquor
Formula；
Wherein, if the measure time (currently carrying out the time of measure) of oil well and well was away from completion time > 3 years, selection
Oil pipe feed liquor (i.e. oil pipe injection water), and if oil well and well measure time interval completion time≤3 year, selection oil jacket are infiltrated or covered
(oil jacket infiltrates the oil pipe and oil jacket annulus of i.e. tripping in the mode of pipe feed liquor, while injecting the mode of water.Casing feed liquor, that is, oil reservoir set
Manage the mode directly filled the water).
6th step, the pit shaft before completing construction prepare；
In step 6, in specific implementation, pit shaft preparation includes: successively to carry out well-flushing, pressure according to well control requirement before constructing
Well, scraping, tests set, pressure testing at drifting, and the production tree that then changes the outfit (such as 700 or 1000 type production trees) simultaneously reinforces well head.
In specific implementation, in step 6, after reinforcing well head, wirerope (such as four) and land used anchoring are also added
It is fixed.
It should be noted that production tree is the well that flowing well and machine-pumped oil well etc. are used to exploit petroleum in oil field development field
Mouth device.
7th step, while pressure break water filling is carried out to well and oil well, with well group offset well whole closing well and pressure gauge is installed；
It should be noted that pressure break refers in oil recovery or gas production process in field of oil development, using hydraulic action, make
Oil-gas Layer forms a kind of method in crack, and fracturing technology is common oil development method, including packer layered pressure break, limit
A variety of fracturing process such as the separate stratum fracfturing of stream method and blocking ball selection pressure break.
8th step, after the completion of construction, oil well and well (i.e. oil-water well) keep closing well state, oil well and surrounding offset well
(i.e. around oil well and well) according to pressure change, to select well opening time.
In step 8, in specific implementation, according to pressure change, to select well opening time specifically: oil well continuous 5 days
Pressure change≤the 0.1MPa of (round-the-clock for 24 hours daily), can opening well and making production.
Based on above technical scheme it is found that LOW PERMEABILITY RESERVOIR provided by the invention more wells collaboration energizations are handled up method, be one
The preferred well of a well group and the water filling of oil well concurrent fracturing, change underground flow field by pressure break, are formed between oil well and well
Imitate seepage flow.Well group formation depletion energy is disposably supplied, stewing well after having pressed, after effectively displacement has occurred in the fluid in stratum
Oil well opening well and making production, well still maintain closing well state, form pressure difference in the earth formation, are conducive to crude oil and flow to oil well direction
It is dynamic, to supplement stratum energy for LOW PERMEABILITY RESERVOIR, improves recovery ratio and provide new approach.
In order to effect of the invention is more clearly understood, illustrate combined with specific embodiments below.
Embodiment.
By taking a well group G154 well group of certain block as an example, method progress is handled up in detail to LOW PERMEABILITY RESERVOIR more wells collaboration energization
Explanation.
The first step, G154 well group are inverted nine-spot pattern, well spacing 200m.Region major fracture orientation is 30 ° of east northeast, preferred center
Position well G112 and positive northern oil well G108.
Second step is gone into operation for G154 well group 2015, about 40,000 side of the amount of well group deficit at present, well G112 and oil well G108 note
Entering the sum of amount is 40,000 sides.Well G112 injection rate is 10,000 sides, and oil well G108 injection rate is 30,000 sides.
Third step, well G112 maximum interlayer coefficient of variation are (13.2*2.6)/(8.6*2.9)=1.38, maximum interlayer
Coefficient of variation < 2, using conjunction note technique；Well G108 maximum interlayer coefficient of variation be (26.2*3.3)/(4.2*1.6)=
12.9, maximum interlayer coefficient of variation > 2, using layering injection technology.
4th step takes water source water sample to be implanted, and slippery water, friction reducer and water source compatibility are good, no to precipitate, without flocculation.
Expansion-resisting agent, friction reducer and water are uniformly mixed according to 1,0.1,98.9 mass ratio and form aqueous solution, carries out laboratory experiment, rock core
Injury rate is 28.2%, and landwaste anti-dilative is 89.5%.
5th step, is preferably injected mode.For well G112 in 2016.9 complete wells, commencement date 2018.10 is mixed using oil jacket
Into injection mode.Oil well G108 is in 2011.3 complete wells, commencement date 2018.10, using oil pipe feed liquor.
6th step is completed pit shaft before constructing and is prepared.
Well G112 pit shaft prepares are as follows: washes, kill-job, first uses 3%KCl solution backwash well one week or more, observe overflow in 2 hours
Amount.Further according to surveying pressure situation selection suitable the high-quality well killing fluid kill-job of Solid Free one week or more, disengaging oral fluid fluidity is consistent.Construction
Before, it is full of with cementing truck to being filled between surface pipe and production string, table sleeving valve connection relief line is opened to arranging in side
Dirty tank waits pressing crack construction.Well head recovered the oil with 700 types (gas) set and reinforce well head, add four wirerope and use earth anchorage.It adopts
In oil tree installation strict implement Q/SY DG 1450-2018 " underground work well control detailed rules for the implementation " 6.2: the peace for (gas) tree of recovering the oil
Reload request.Relief line is installed referring to the 4.4.3.6: well head in SY5727-2014 " underground work safety code ", direction is avoided
Measure construction area.Fixed with earth anchor (cement foundation pier etc.) at interval of 10m and exit, blow-down pipe is unimpeded, must not install additional small
In 120 ° of elbows.Referring to the 4.4.3.7 in SY5727-2014 " underground work safety code ": measure preparation work finishes, by setting
Meter requires to close (set) tubing valve to after well head and down-hole string pressure testing qualification, carried out an acceptance inspection, signed by professional.
Pit shaft preparation is specific as follows before oil well G108 constructs:
1, it washes, kill-job, mentions tubing string in well: first with 3%KCl solution backwash well one week or more, observing 2 hours spillway discharges.Again
According to surveying pressure situation selection suitable the high-quality well killing fluid kill-job of Solid Free one week or more, disengaging oral fluid fluidity is consistent.Observation 2 hours
Well head can dismantle production tree without overflow, install preventer immediately by the operation requirement of disassembly production tree dress preventer, as required
Pressure testing is carried out, after pressure testing is qualified, acts tubing string in well.During playing pipe, the well killing fluid of identical fluidity is filled when rising, liquid level is kept
In well head.Kill-job operation is washed to execute in strict accordance with Q/SY DG 1450-2018 " underground work well control detailed rules for the implementation " 7.2.Disassembly
(gas) tree (not including four-way), installation preventer operation recover the oil in strict accordance with Q/SY DG 1450-2018 " underground work well control reality
Apply detailed rules and regulations " 7.4 execution.Well killing fluid density is in strict accordance with Q/SY DG 1450-2018 " underground work well control detailed rules for the implementation " 5.2.5
It executes.Lift pipe string operation is executed in strict accordance with Q/SY DG 1450-2018 " underground work well control detailed rules for the implementation " 7.5.
2, visit sand washing: lower bare string tail band Φ 73.02mm pen tip visits punching to current artificial bottom of a well.Drifting: lower Φ 114mm ×
The drifting of 1.2m gauguste cutter is proposed after well-flushing to current artificial bottom of a well.
3, scraping, pipe string pressure test: tubing string+Φ 73.02mmP110 external upset tubing needed for fracturing+disconnected pin type circulating valve+
It blocks pipe nipple+centre ball seat (dribbling)+Φ 140mm scraper scraping to 3850m, scraping is no less than repeatedly for packer set position
3 times (packer set position 3510m, 3830m), it is to pipe string pressure test 30MPa, 30min, pressure drop≤0.5MPa after thorough well-flushing
Qualification proposes tubing string.
4, test set: lower packet is setting in 3830m (avoiding casing collar location), and anti-pressure testing 15MPa examines upper sleeve
Leakproofness, observation 30min pressure drop≤0.5MPa are qualification.Well head change the outfit 700 types recover the oil (gas) tree four-way, propose tubing string.Play pipe
Column operation is executed in strict accordance with Q/SY DG 1450-2018 " underground work well control detailed rules for the implementation " 7.5.It runs the test plug, to measure
Recover the oil (gas) tree and production string connecting portion pressure testing 42MPa, and 20 minutes, connecting portion, which does not pierce, not to be leaked.
5, fracturing tubing string :+1 Φ of Φ 88.9mmP110 external upset tubing 2000m+ Φ 88.9mmN80 plain end oil well pipe
73.02mmP110 external upset tubing++ 1 Φ of packer × 3510m (avoiding casing collar location 3504.31m, 3514.46m)
73.02mm P110 external upset tubing+horn mouth.It is just replacing in oil pipe into 3%KCL solution.Fracturing string is completed, is waited to be onstructed.Pressure
It is as shown in the picture to split tubular column structure.Lower tubular column operation strict implement Q/SY DG 1450-2018 " implement thin by underground work well control
Then " the well control requirement of 7.6 lower tubular column operations.Well head recovered the oil with 700 types (gas) set and reinforce well head, add four wirerope and land used
Anchoring is fixed.Relief line is installed referring to the 4.4.3.6: well head in SY5727-2014 " underground work safety code ", direction is avoided
Measure construction area.Fixed with earth anchor (cement foundation pier etc.) at interval of 10m and exit, blow-down pipe is unimpeded, must not install additional small
In 120 ° of elbows.Referring to the 4.4.3.7 in SY5727-2014 " underground work safety code ": measure preparation work finishes, by setting
Meter requires to close (set) tubing valve to after well head and down-hole string pressure testing qualification, carried out an acceptance inspection by professional.
7th step, while pressure break water filling is carried out to well and oil well, with the other 4 mouthfuls of offset well whole closing wells of well group and pressure is installed
Power table.
8th step, after the completion of construction, well continues to keep closing well state, continuous 5 days of 18d, offset well G165 pressure change for 24 hours
≤ 0.1MPa, first opening well and making production.Other wells continue closing wells, observe pressure change, if continuous 5 days pressure changes for 24 hours≤
0.1MPa, can opening well and making production.
Compared with prior art, a kind of LOW PERMEABILITY RESERVOIR provided by the invention more wells collaboration energizations are handled up method, have with
Under technical effect:
1, more wells collaboration energization of the invention is handled up method, and preferably well and oil well fills the water simultaneously, relative to individual well injection,
Underground flow field is more balanced, reduces water breakthrough risk.
2, technical solution of the present invention, well and oil well are filled the water higher than fracture pressure, injection rate is big, solves hypotonic
Reservoir water pressure is high, note not into problem.Stratum energy is once supplied simultaneously, also solves the problems, such as formation depletion.
3, for technical solution of the present invention, well and oil well concurrent fracturing, pressure break makes stratum generate crack, in supplement energy
Stratum flow conductivity is also increased while amount, the presence in crack makes the connectivity between oil well and well improve.
4, for technical solution of the present invention, well continues closing well, oil well opening well and making production, oil well pressure decline after having pressed
Promote the injection fluid in stratum to oil well direction seepage, is conducive to improve well oil output.
In conclusion compared with prior art, a kind of LOW PERMEABILITY RESERVOIR more wells collaborations energization side of handling up provided by the invention
Method, which overcome above-mentioned prior art shortcoming, can effectively solve existing LOW PERMEABILITY RESERVOIR difficult water injection (as note not into) and lead
The problem of stratum energy of cause cannot be supplemented timely and effectively has great practice significance.
The method in addition, the more well collaboration energizations of a kind of LOW PERMEABILITY RESERVOIR provided by the invention are handled up, additionally it is possible to effectively solve hypotonic
The ineffective problem of flushing in oil reservoir.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
- A kind of method 1. more well collaboration energizations of LOW PERMEABILITY RESERVOIR are handled up, which comprises the following steps:The first step, according to well net deployment, preferred a bite well and at least a bite oil well in the same well group；Second step determines well and oil well injection rate according to the well group deficit amount；Third step is preferably injected technique according to oil well and well target zone physical property characteristic and hole condition；4th step, according to laboratory test, preferably well injects liquid system；5th step, is preferably injected mode；6th step, the pit shaft before completing construction prepare；7th step, while pressure break water filling is carried out to well and oil well, with well group offset well whole closing well and pressure gauge is installed；8th step, after the completion of construction, oil well and well keep closing well state, and corresponding oil well and surrounding offset well are according to pressure Variation, to select well opening time.
- The method 2. the more well collaboration energizations of LOW PERMEABILITY RESERVOIR as described in claim 1 are handled up, which is characterized in that in the first step, excellent The well of choosing refers to the well being preferably placed at more than well pattern center or benefited well in a well group；Preferred oil well refers to that the oil well in region major fracture orientation is avoided in orientation as far as possible.
- The method 3. the more wells collaboration energizations of LOW PERMEABILITY RESERVOIR as described in claim 1 are handled up, which is characterized in that well group deficit amount is The sum of well and the injection rate of oil well；Oil well injection rate is 10,000 sides/mouth, and well injection rate is the difference of well group deficit amount and oil well injection rate.
- The method 4. the more well collaboration energizations of LOW PERMEABILITY RESERVOIR as described in claim 1 are handled up, which is characterized in that third step specifically:If maximum interlayer coefficient of variation≤2, using conjunction note technique, and if maximum interlayer coefficient of variation > 2, selection layering injection Technique；Wherein, maximum interlayer coefficient of variation refers to the ratio k 1*h1/k2*h2 of two different substratum formation capacities；Wherein, k1 refers to the effective permeability of first substratum, and h1 refers to that the effective thickness of oil reservoir in first substratum, k2 refer to The effective permeability of second substratum, h2 refer to the effective thickness of oil reservoir in second substratum.
- The method 5. the more well collaboration energizations of LOW PERMEABILITY RESERVOIR as described in claim 1 are handled up, which is characterized in that in the 4th step, tool On body is realized, specifically includes the following steps:Firstly, taking the water sample at water source to be implanted, it is desirable that friction reducer and water source compatibility are good, no to precipitate, without flocculation；Then, expansion-resisting agent, friction reducer and water are uniformly mixed according to 1,0.1,98.9 mass ratio and form aqueous solution, to the water Solution carries out laboratory experiment, it is desirable that core damage rate≤30%, landwaste anti-dilative >=85%, final acquisition need to inject smooth Water.
- The method 6. the more well collaboration energizations of LOW PERMEABILITY RESERVOIR as described in claim 1 are handled up, which is characterized in that in the 5th step, tool On body is realized, injection mode includes that oil pipe feed liquor, oil jacket are infiltrated and three kinds of modes of casing feed liquor；Wherein, if measure time interval completion time > 3 years of oil well and well, select oil pipe feed liquor, and if oil well and well are arranged Time interval completion time≤3 year are applied, selection oil jacket is infiltrated or the mode of casing feed liquor.
- The method 7. the more well collaboration energizations of LOW PERMEABILITY RESERVOIR as described in claim 1 are handled up, which is characterized in that in step 6, apply Pit shaft preparation includes: and successively carries out well-flushing according to well control requirement, kill-job, drifting, scraping, tests set, pressure testing, then change the outfit before work Production tree simultaneously reinforces well head.
- The method 8. the more well collaboration energizations of LOW PERMEABILITY RESERVOIR as claimed in claim 7 are handled up, which is characterized in that in step 6, In After reinforcing well head, also adds wirerope and use earth anchorage.
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| CN114526045A (en) * | 2020-11-23 | 2022-05-24 | 中国石油天然气股份有限公司 | Horizontal well energization method and device and computer readable storage medium |
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Effective date of registration: 20201104 Address after: 300000 No. three, Dagang Oilfield, Binhai New Area, Tianjin Applicant after: DAGANG OILFIELD GROUP Co.,Ltd. Applicant after: CHINA NATIONAL PETROLEUM Corp. Address before: 300280 Dagang three, Binhai New Area, Tianjin Applicant before: DAGANG OILFIELD GROUP Co.,Ltd. |
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Application publication date: 20191115 |