CN1916358A - Method for coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway - Google Patents
Method for coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway Download PDFInfo
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- CN1916358A CN1916358A CN 200610010508 CN200610010508A CN1916358A CN 1916358 A CN1916358 A CN 1916358A CN 200610010508 CN200610010508 CN 200610010508 CN 200610010508 A CN200610010508 A CN 200610010508A CN 1916358 A CN1916358 A CN 1916358A
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Abstract
The present invention relates to a method for regulating narrow-small river channel sand body waterflooding displacement injection-production relationship. Said invention is characterized by that according to the development characteristics of narrow-small river channel sand body said invention utilizes the numerical simulation research and production practice, and uses river channel sand and river bank non-channel sand whose effective thickness is above 1m as waterflooding object, in same sedimentation unit adopts polymer displacement mode for river channel sand body and its river bank portion and adopts waterflooding displacement mode for sand body between rivers so as to form water and polymer common displacement.
Description
Technical field
The invention belongs to field of petroleum exploitation.
Background technology
Narrow river channel sand refers to leading edge sand body in the interior delta of delta deposit system, they are that land distributary channel is to leading edge continuity formation naturally mutually under water, river channel sand during characteristics are to shunt under water is pod-like or irregular ribbon intermittently distributes, river channel sand is grown thickness and mostly is 2-5m, and the river course extends different in size, and width is narrow, how in 500-600m, part river channel sand width is less than 300m, and the zone between river diversion is the filling of interchannel sand body institute, also is ribbon more and distributes.Narrow river channel sand presents the channel sand scale of growing generally and obviously diminishes, the number of plies increases, and thickness attenuation, permeability step-down, plane and vertical heterogeneity become serious characteristics: for example Portugal, Daqing oil field Sa Bei development zone one group of oil reservoir average effective permeability is 0.72 μ m
2, narrow river channel sand average effective permeability is 0.43 μ m
2, permeability is starkly lower than the one group of oil reservoir in Portugal; It is 54.00% that the one group of oil reservoir channel sand in Portugal on average bores encountering rate, and it is 26.41% that the channel sand of narrow river channel sand on average bores encountering rate, than one group low 27.59 percentage points of Portugals.
For remedying the non-homogeneity of narrow river channel sand, need to limit the poly-object of notes and exploit, the poly-object of the main notes of narrow river channel sand is defined as channel sand and the non-channel sand more than the effective thickness 1m of limit, river course portion.Because the serious characteristic of narrow river channel sand non-homogeneity, supermature river course and limit, river course portion sand body gather drive, to growing poor interchannel and the off-balancesheet sand body carries out water drive, occur same unit Nei Shui inevitably, gather two and drive the coexistence phenomenon.In same unit, take water poly-with driving mode, poly-at water with driving near the imperfection that causes injection-production relation the contact zones easily, therefore it is poly-with the injection-production relation that drives near water drive well of contact zones and polymer displacement oil well to coordinate water, reducing poly-the driving of water and influence each other, is the problem that narrow river channel sand polymer displacement oil well perforation needs emphasis to solve.
Summary of the invention
Take in order to solve that water is poly-to exist with the mode of driving that water is poly-to cause the incomplete problem of injection-production relation easily with near driving contact zones in same unit, the present invention is according to the development characteristics of narrow river channel sand, through numerical simulation study and production practices, a kind of method of coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway is provided, this method serves as the main poly-object of annotating with channel sand and the non-channel sand more than the effective thickness 1m of limit, river course portion, with the producing well edge sealing, in same sedimentation unit, river channel sand and limit portion thereof are adopted the polymer displacement of reservoir oil mode, the interchannel sand body is adopted the displacement in flooding mode, form water, the common displacement of polymer.
The present invention has provided the concrete grammar of coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway by research, improved well pattern control degree, reduced horizontal contradiction (because oil bearing formation property difference in the plane, cause the difference aspect strata pressure, rate of water cut increase, oil recovery situation between each well of same oil reservoir, mutual restriction and interference between each well influence the performance of capacity of oilwell).
The specific embodiment
The specific embodiment one: the method for the coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway of present embodiment serves as the main poly-object of annotating with channel sand and the non-channel sand more than the effective thickness 1m of limit, river course portion, in same sedimentation unit, river channel sand and limit portion thereof are adopted the polymer displacement of reservoir oil mode, the interchannel sand body is adopted the displacement in flooding mode, form water, the common displacement of polymer.According to above-mentioned total principle, present embodiment has been determined following several coordination approach:
The one, water is poly-with driving contact zones, and the water drive well is adjusted in principle with the producing well edge sealing, to guarantee water drive, the poly-formation injection and extraction system independently separately that drives.
The 2nd, water is poly-, and the water drive water injection well is communicated with poly-drive injection well with driving contact zones, gathers the drive injection well well spacing greater than 350m place perforation in water drive water injection well distance.
The 3rd, water is poly-with driving contact zones, and the water drive water injection well drives producing well and is communicated with poly-, gathers in water drive water injection well distance and drives the producing well well spacing greater than 300m place perforation.
The 4th, establishment polymer displacement oil well perforation scheme will (determine to inject well perforation object earlier to be doomed to adopt, penetrate out oil well according to the perforation layer correspondence of injecting well, fixed output quota goes out layer position after promptly deciding earlier the implanted layer position), with extraction oil well edge sealing, the extraction well cooperates the injection well to improve injection-production relation, and the injection well satisfies perforating condition and carries out perforation, and producing well can not satisfy perforating condition, can relax extraction well perforation standard, effective thickness also carries out perforation less than the layer of 1m.
The 5th, if inject on the scattered interchannel sand of well location in the river channel sand that large tracts of land distributes,, carry out perforation to injecting well though effective thickness less than 1m, can relax the perforation boundary.
The 6th, the stone roller shape sand body of meeting is bored in single well point, though effective thickness greater than 1m, polymer displacement oil well does not carry out perforation yet, the shape sand body that sticks together is adjusted object as water drive, is exploited by the water drive well.
The 7th, as long as there are notes to adopt communication direction in the ribbon river channel sand,, be positioned at the oil reservoir at limit, river course portion variation position (effective thickness is less than the position of 1m) to reduce the reserves loss just as the poly-adjustment object that drives, can improve development degree by pressure break.
The 8th, if poly-drive produced well is positioned at poly-variation position (effective thickness is less than the position of 1m) of driving the zone, and the water-drive oil recovery well location of same well site (two mouthfuls well well spacing 50m within) is in channel sand, poly-drive produced well is perforation not, and water-drive oil recovery well perforation is improved the polymer displacement oil well injection-production relation.
The specific embodiment two: (the one group of oil reservoir in Portugal is based on the flood plain fluvial facies deposit, and oil reservoir is grown, sandstone thickness 4-9m to the one group of oil reservoir in Portugal for Daqing oil field, channel sand growth scale is big, river width is greater than 1000m, the permeability height, and effective permeability reaches 0.5 μ m
2More than) carry out extensive polymer flooding exploitation, bore the target zone of meeting and almost all penetrate out.One group of oil reservoir of narrow river channel sand and Portugal is compared, and bigger difference is arranged.Present embodiment is coordinated relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to following method:
One, coordinates the main way of relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway
On the basis of the well log interpretation achievement of stepout well, draw the sedimentary facies belt figure of drilling well block, poly-according to water with the analysis of driving each unit sand body type, the poly-object of notes of determining narrow river channel sand is channel sand and the above non-channel sand of the effective thickness 1m of limit, river course portion, and correspondingly determined to coordinate poly-8 kinds of methods of driving injection-production relation, be respectively:
The one, water drive, poly-drive contact zones, when the water drive well is adjusted in principle with the producing well edge sealing, to guarantee water drive, the poly-formation injection and extraction system independently separately that drives.
For example poly-drive injection well north 2-351-P37 Sa III3+4b layer is positioned at and poly-ly drives regional perforation, and the water-drive oil recovery well Bei2-350-30Jing that is positioned at adjacent water drive zone is perforation also.
The 2nd, water drive, poly-drive contact zones, the water drive water injection well is communicated with poly-drive injection well, and the water drive water injection well must distance gathers the drive injection well well spacing can perforation greater than 350m.
For example poly-drive injection well north 2-350-P26 Sa III1 layer is positioned at river channel sand, does not also give perforation though be in the interchannel position apart from the water drive water injection well Bei2-350-24Jing of its 80m.
The 3rd, water drive, the poly-contact zones that drive, the water drive water injection well drives producing well and is communicated with poly-, the water drive water injection well must distance gather drive the producing well well spacing can perforation greater than 300m.
For example poly-drive produced well Bei2-353-P22Jing carries out perforation in this layer position, and the water-drive oil recovery well north 2-340-22 well that is positioned at water drive zone outside the 300m can carry out perforation, carries out the water drive exploitation.
The 4th, to (determine to inject well perforation object earlier to be doomed to adopt during establishment polymer displacement oil well perforation scheme, penetrate out oil well according to the perforation layer correspondence of injecting well, fixed output quota goes out layer position after promptly deciding earlier the implanted layer position), with extraction oil well edge sealing, the extraction well cooperates the injection well to improve injection-production relation, and the injection well satisfies perforating condition and carries out perforation, and producing well can not satisfy perforating condition, can relax extraction well perforation standard, effective thickness also carries out perforation less than the layer of 1m.
The Sa II13+14b layer of for example poly-drive injection well north 2-352-P24 is positioned at the river course, and west side producing well north 2-352-P23 well location can be penetrated out Bei2-352-P23Jing for improving injection-production relation in interchannel, and contiguous water dependent well north 2-351-22 also can perforation.
The 5th, if inject on the scattered interchannel sand of well location in the river channel sand that large tracts of land distributes,, carry out perforation to injecting well though effective thickness less than 1m, can relax the perforation boundary.
For example poly-drive injection well north 2-352-P38 well Sa III5+6b layer is in the local variation of sand body position, sandstone thickness 1.0m, and effective thickness 0.6m, 4 mouthfuls are poly-ly driven producing well and all are positioned at the river course on every side, though should inject the well effective thickness less than 1m, also can consider perforation.
The 6th, the stone roller shape sand body of meeting is bored in single well point, though effective thickness greater than 1m, polymer displacement oil well does not carry out perforation yet, adjusts object as water drive, is exploited by the water drive well.
For example poly-drive injection well north 2-341-P36 well Sa III2 layer is in the shape sand body that sticks together, sandstone thickness 3.0m, and effective thickness 2.0m satisfy the poly-perforating condition that drives, but because the shape sand body that sticks together is positioned at the water drive zone, polymer displacement oil well does not carry out perforation.
The 7th, as long as there are notes to adopt communication direction in the ribbon river channel sand,, be positioned at the oil reservoir at limit, river course portion variation position (effective thickness is less than the position of 1m) to reduce the reserves loss just as the poly-adjustment object that drives, can improve development degree by pressure break.
For example poly-drive injection well north 2-350-P30 well Sa III2 layer is in the narrow strip river channel sand, the extraction well of top, bottom also is in the river channel sand, can constitute two notes after these three mouthfuls of wells are penetrated out and adopt communication direction, therefore these three mouthfuls of polymer displacement oil wells are carried out perforation, the poly-crude oil that drives in the exploitation channel sand.The extraction well of the left and right sides is in the interchannel sand, though effective thickness less than 1m, in order to constitute the complete poly-injection-production relation that drives, also carries out perforation, because these two mouthfuls of well oil reservoirs growths are poor, carries out pressure break, improves the oil reservoir penetrating power.
The 8th, if poly-drive produced well is positioned at poly-variation position (effective thickness is less than the position of 1m) of driving the zone, and the water-drive oil recovery well location of same well site (two mouthfuls well well spacing 50m within) is in channel sand, poly-drive produced well is perforation not, and water-drive oil recovery well perforation is improved the polymer displacement oil well injection-production relation.
For example poly-drive injection well north 2-342-P27 well Sa II13+14a layer is positioned at the river course, producing well north, west side 2-342-P26 well location is in interchannel, effective thickness has only 0.5m, do not carry out perforation, to penetrate out apart from northern 2-342-P26 well 50m and the water dependent well Bei2-341-24Jing that is positioned at the river course, the perfect poly-injection-production relation that drives increases and adjusts thickness 4.0m.
Two, coordinate the applicable cases of relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway method
Through the tackling key problem with great concentration more than 2 years, dissect according to fine geology after early stage analogue perforation and the new well finishing drilling, 8 kinds of methods that injection-production relation is driven in the coordination two that draws according to research, the perforation scheme that establishment is implemented not only makes the north narrow river channel sand polymer flooding control extent of two cc of pieces that tomography gathers reach 70.6% of program prediction, and further brings up to 81.7%.
By coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway, carry out the poly-dividing region of water, and on the exploitation object, formulated strict standard, make perforation object layer differences obviously reduce, inject well interlayer permeability grade and have only 2.1, perforation object homogenieity is better; Poor efficiency well ratio reduces, and makes individual well penetrate out thickness and is reduced to 11.0% less than the well ratio of 6m; By coordinating the research of injection-production relation method, narrow river channel sand polymer flooding control extent is further brought up to more than 80%, reach 81.7%, improved 11.1%, provide assurance for improving narrow river channel sand polymer flooding effect.
Claims (8)
1, coordinates the method for relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway, it is characterized in that described method serves as the main poly-object of annotating with channel sand and the non-channel sand more than the effective thickness 1m of limit, river course portion, with the producing well edge sealing, in same sedimentation unit, river channel sand and limit portion thereof are adopted the polymer displacement of reservoir oil mode, the interchannel sand body is adopted the displacement in flooding mode, form water, the common displacement of polymer.
2, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1 is characterized in that the water drive water injection well is communicated with poly-drive injection well, gathers the drive injection well well spacing greater than 350m place perforation in water drive water injection well distance.
3, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1 is characterized in that the water drive water injection well drives producing well and is communicated with poly-, drives the producing well well spacing greater than 300m place perforation at the water drive water injection well apart from gathering.
4, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1, it is characterized in that working out polymer displacement oil well perforation scheme, determine to inject well perforation object earlier, penetrate out oil well according to the perforation layer correspondence of injecting well, with extraction oil well edge sealing, the extraction well cooperates the injection well to improve injection-production relation, the injection well satisfies perforating condition and carries out perforation, and producing well can not satisfy perforating condition, relaxes extraction well perforation standard, and effective thickness also carries out perforation less than the layer of 1m.
5, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1 is characterized in that injecting on the scattered interchannel sand of well location in the river channel sand that large tracts of land distributes, and carries out perforation to injecting well.
6, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1 is characterized in that adjusting object with the shape sand body that sticks together as water drive, and polymer displacement oil well does not carry out perforation, is exploited by the water drive well.
7, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1 has notes to adopt the condition of communication direction as long as it is characterized in that satisfying in the ribbon river channel sand, drives the adjustment object with it as gathering.
8, the method for coordination relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway according to claim 1, it is characterized in that poly-drive produced well is positioned at poly-variation position of driving the zone, and with the water-drive oil recovery well location in well site in channel sand, poly-drive produced well is perforation not, to water-drive oil recovery well perforation.
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| CN 200610010508 CN1916358A (en) | 2006-09-06 | 2006-09-06 | Method for coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway |
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| CN 200610010508 CN1916358A (en) | 2006-09-06 | 2006-09-06 | Method for coordinating relation for collecting or dissipating as well as injecting or gathering ore mass in narrow and small riverway |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322055A (en) * | 2020-02-12 | 2020-06-23 | 大庆油田有限责任公司 | Method and device for developing thin-difference oil layer well pattern reconstruction |
| CN113738319A (en) * | 2021-09-07 | 2021-12-03 | 中国石油大学(北京) | Water drive invalid cycle identification method, device and medium based on Lorentz curve |
-
2006
- 2006-09-06 CN CN 200610010508 patent/CN1916358A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322055A (en) * | 2020-02-12 | 2020-06-23 | 大庆油田有限责任公司 | Method and device for developing thin-difference oil layer well pattern reconstruction |
| CN113738319A (en) * | 2021-09-07 | 2021-12-03 | 中国石油大学(北京) | Water drive invalid cycle identification method, device and medium based on Lorentz curve |
| CN113738319B (en) * | 2021-09-07 | 2022-05-03 | 中国石油大学(北京) | Water drive invalid cycle identification method, device and medium based on Lorentz curve |
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