CN108915649A - A kind of oil reservoir pressure is stifled to drive technology pattern preferred method - Google Patents
A kind of oil reservoir pressure is stifled to drive technology pattern preferred method Download PDFInfo
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- CN108915649A CN108915649A CN201810823080.9A CN201810823080A CN108915649A CN 108915649 A CN108915649 A CN 108915649A CN 201810823080 A CN201810823080 A CN 201810823080A CN 108915649 A CN108915649 A CN 108915649A
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- stifled
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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
- 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
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- 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
- 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
Abstract
The invention discloses a kind of oil reservoirs to press stifled drive technology pattern preferred method, this method is according to data such as well group reservoir development, well pattern condition, exploitation actuality, remaining oil distribution situation and Geologic analysis, well group high water logging inefficient cycle position has been determined, it proposes that 7 kinds of pressures are stifled and drives construction technology mode, and condition criterion is carried out according to simple inefficient cycle position, remaining oil distribution situation, quickly construction technology mode rationally " is pressed to block up and drive " to purpose oil reservoir individual well or well group matching.It solves the problems, such as to can not achieve complicated well group remaining oil of effectively taping the latent power using the technology pattern for pressing stifled or oil well pressure to drive for individual well progress oil well at present.
Description
Technical field
The present invention relates to technical field of petroleum extraction, and in particular to a kind of oil reservoir pressure is stifled to drive technology pattern selection method.
Background technique
Some oil field major oil reservoirs of the country are after chemical flooding exploitation at present, and recovery percent of reserves is up to 50% or more, comprehensive water cut
95% or more, rock particles gradually disperses, migrates in reservoir pore space, forms greater than original the aperture tens even height of hundred times
The strong washing band of infiltration, the longitudinal heterogeneity of oil reservoir are more serious.In subsequent waterflooding development process, oil reservoir bottom shape
It is inefficient, inefficient cycle is serious at strong washing band, it causes at the top of positive rhythm formation or the low washing portion in compound rhythm oil reservoir middle and upper part
The remaining oil of position remaining cannot get displacement and employ.
The oil field having at present combines remaining oil distribution feature after chemical flooding, proposes fracturing plugging technology, using extensive
Pressure break makes horizontal fracture, quickly propels medicament to destination region, realizes reservoir plugging bottom inefficient cycle position, Remaining Oil
New approaches.
And fracturing plugging technology is mainly stifled using individual well pressure at oil well end at present or individual well pressure drives two kinds of construction technology modes,
Both construction technology modes, through use after a period of time, discovery is had certain problems, specific as follows：
A. individual well pressure is stifled
Principle：Level artificial crack is pressed off at oil well end bottom dominant flowing path position, as illustrated in figures 1A and ib, pump note envelope
Medicament is blocked up, dominant flowing path is blocked after medicament plastic, injection fluid streams at nearly oil well end, the low aqueous portion in displacement oil reservoir top
Position remaining oil.
Problem：Being injected medicament size limit and horizontal fracture shape by fracturing string maximum influences, and oil well side pressure splits people
Work crack penetration ratio is uncontrollable, and if man-made fracture is ellipse, then blocking radius R is actually smaller, injects fluid flow line closer to oil
Well end, involves that remaining oil range is smaller, then the case where oil reservoir top low water cut section remaining oil cannot effectively be employed.
B, individual well pressure is driven
Principle：On oil well end top, low water cut section presses off level artificial crack, as shown in Figure 2 A and 2 B, pump note displacement of reservoir oil medicine
Agent, displacement handles up out by oil well end plays displacement of reservoir oil effect, Remaining Oil.
Problem：Being injected medicament size limit and oil reservoir vertical heterogeneity by fracturing string maximum influences, on oil well end
It is small that low water cut section pressure in portion's drives radius of handling up, and injects fluid at oil well end there is no streaming, can not be on effective displacement oil reservoir
Portion's low water cut section remaining oil.
Both the above technology pattern is constructed in face of relatively simple individual well, and even existing can not effective displacement residue
The problem of oil, so, in face of complicated well group sand body development, connection and remaining oil distribution, especially gather oil after driving
Macropore inefficient cycle problem in oil reservoir bottom between well carries out fracturing plugging for individual well or pressure break Drainage process mode is then complete
Complicated reservoirs condition after not adapting to poly- drive entirely needs the technology pattern that drives stifled to pressure and is targetedly refined, classified, excellent
Choosing.
Summary of the invention
In view of this, the present invention provides, a kind of oil reservoir pressure is stifled to drive technology pattern preferred method, which is suitable for multiple
The effective displacement of miscellaneous well group remaining oil solves to carry out oil well pressure is stifled or oil well pressure is driven technology pattern not using for individual well at present
It is able to achieve the problem of effectively taping the latent power complicated well group remaining oil.
For achieving the above object, the technical solution adopted by the present invention is that：A kind of stifled drive technology pattern of oil reservoir pressure is preferred
Method, which is characterized in that including：
Determine connection situation and the remaining oil cloth-like of the well group between the water logging explanation data of well group, the oil-water well of the well group
Condition；And
According to the water logging of the well group explain data, the well group oil-water well between connection situation and the remaining oil of the well group
Cloth situation, selection pressure is stifled to drive technology pattern, and the technology pattern is respectively：
1. the high water logging section of 0.5m or more is not present in the oil well end and well end of the well group, grease sand body between wells connectivity is not
It is good, then：
If the remaining oil close to the oil well end, both carries out oil well pressure at the oil well end and drives；
If the remaining oil close to the well end, both carries out well pressure at the well end and drives；
2. there are 0.5m or more water logging sections at the oil well end, then：
If the grease sand body between wells connectivity is good, the remaining oil both carried out oil at the oil well end close to the oil well end
Well pressure is stifled；
If the grease sand body between wells connectivity is bad, the remaining oil is present among the oil-water well, both in the well
End carries out well pressure and drives, and stifled in oil well end progress oil well pressure；
3. there are the high water logging sections of 0.5m or more at the well end, then：
If the grease sand body between wells connectivity is good, the remaining oil both carried out oil at the oil well end close to the well end
Well pressure is driven, and is carried out well pressure at the well end and blocked up；
If the grease sand body between wells connectivity is bad, the remaining oil is present among the oil-water well, both in the well
It is stifled that end carries out well pressure；
4. the oil well end and the well end have the high water logging section of 0.5m or more, the grease sand body between wells connectivity is good,
The remaining oil is present in oil reservoir top between the oil-water well, then it is stifled to carry out oil well pressure at the oil well end, and in the water
It is stifled that well end carries out well pressure.
Preferably, the technology pattern 1. in, oil well pressure is driven, be in reservoir top hyposmosis position pressure break seam,
The oil displacement agent displacement of reservoir oil is injected, is handled up the remaining oil out by the oil well end；The well pressure is driven, and is in reservoir top Thief zone section
Pressure break seam injects the oil displacement agent displacement of reservoir oil, is subsequently implanted into fluid, and the fluid replaces out the slug of the oil displacement agent,
Remaining Oil.
Preferably, the technology pattern 2. in, oil well pressure is stifled, is in reservoir lower part Thief zone section pressure break seam, note
Enter blocking agent to be blocked, is subsequently implanted into the fluid at the oil well end and streams Remaining Oil；
It is described both to carry out well pressure drive at the well end and stifled in oil well end progress oil well pressure, then：
The well pressure is driven, and is to inject the blocking agent in lower part Thief zone section pressure break seam and blocked；
The oil well pressure is stifled, is to inject the oil displacement agent and the fluid, the drive in reservoir top hyposmosis section pressure break seam
Finish promote the fluid enter in less permeable layer tap the latent power the remaining oil.
Preferably, the technology pattern 3. in, it is described both to carry out oil well pressure at the oil well end and drive, and at the well end
It is stifled to carry out well pressure, then：
The oil well pressure is driven, and is to inject the oil displacement agent and the fluid in reservoir top hyposmosis section pressure break seam；
The well pressure is stifled, is to inject the blocking agent in reservoir lower part Thief zone section pressure break seam and blocked, the oil displacement agent
Promote less permeable layer Remaining Oil in the fluid entrance；
It is described both stifled in well end progress well pressure, it is to inject the blocking agent in reservoir lower part Thief zone section pressure break seam
It is blocked, is subsequently implanted into the fluid at the well end and streams displacement remaining oil position.
Preferably, the technology pattern 4. in, it is stifled both to have carried out oil well pressure at the oil well end, and carry out at the well end
Well pressure is stifled, is to correspond to pressure break seam in oil reservoir lower part Thief zone section, injects the blocking agent and blocked, be subsequently implanted into the stream
Remaining Oil is washed in less permeable layer drive in body entrance.
Preferably, the remaining oil refers to that the remaining oil is located at 1/3 well spacing at the oil well end close to the oil well end
It is interior；The remaining oil refers to that the remaining oil is located in 1/3 well spacing at the well end close to the well end.
The present invention has the advantages that：A kind of stifled drive technology pattern preferred method of oil reservoir pressure, the scene of proposing can
The 7 kinds of pressures implemented are stifled to drive construction technology mode, avoids single oil well end fracturing plugging or pressure break Drainage process and develops to complexity
The inadaptability of situation, and condition criterion is carried out by simple well group inefficient cycle and remaining oil distribution situation, it can be fast
The pressure that speed is preferably adapted for is stifled to drive technique, sits in the right seat, convenient and efficient.
Detailed description of the invention
By the description below with reference to attached drawing to the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage is apparent, in the accompanying drawings：
Figure 1A is that oil well end individual well presses deblocking technology schematic diagram in background technique；
Figure 1B is that individual well pressure in oil well end is stifled in background technique；
Fig. 2A is that individual well pressure in oil well end drives process schematic representation in background technique；
Fig. 2 B is that individual well pressure in oil well end is driven in background technique；
Fig. 3, which is that the pressure of the embodiment of the present invention is stifled, drives technology pattern preferred method flow chart；
Fig. 4 is that one oil well of the embodiment of the present invention pressure drives schematic diagram；
Fig. 5 is that two well of the embodiment of the present invention pressure drives schematic diagram；
Fig. 6 is that three oil well of the embodiment of the present invention presses stifled schematic diagram；
Fig. 7 is that four oil well of the embodiment of the present invention pressure is blocked up, well pressure drives schematic diagram；
Fig. 8 is that five well of the embodiment of the present invention pressure is blocked up, oil well pressure drives schematic diagram；
Fig. 9 is that six well of the embodiment of the present invention presses stifled schematic diagram；
Figure 10, which is that seven oil-water well of the embodiment of the present invention is corresponding, presses stifled schematic diagram.
Specific embodiment
Below based on embodiment, present invention is described, but it is worth noting that, the present invention is not limited to these realities
Apply example.It is detailed to describe some specific detail sections below in datail description of the invention.However, for not detailed
The present invention can also be understood completely in the part described to the greatest extent, those skilled in the art.
It is to be understood that being divided into a kind of, two classes according to connected state and being connected to three classes：Respectively correspond oil field division
The reservoir conditions of three kinds of ranks, a kind of reservoir, two class reservoirs, three classes reservoir.Connectivity is to refer to establish oil-water well displacement well
Relationship, well can supply water to oil well direction, and connectivity is bad to refer to that well does not supply water in oil well direction, and corresponding displacement is not
To the remaining oil in this direction.
Fig. 3, which is that the pressure of the embodiment of the present invention is stifled, drives technology pattern preferred method flow chart；As shown in Figure 3：A kind of oil reservoir pressure
It is stifled to drive technology pattern preferred method, include the following steps：
（1）Oil reservoir pressure is stifled to drive well group data preparation
The data such as research purpose well hole condition, well pattern condition, Production development, test data, remaining oil distribution situation obtain well group oil
Connection situation, reservoir water flooding interpretation data and remaining oil distribution situation between well, to press the stifled technology pattern that drives preferably to carry out data
Prepare.
（2）The stifled drive technology pattern of pressure is preferred：
According to previous oil well side pressure is stifled or oil well side pressure drive construction technology mode there are the problem of, go out from well group entirety angle
It sends out, connection situation, reservoir water flooding interpretation data, injection water inefficient cycle state, remaining oil distribution etc. between consideration well group oil-water well
Situation changes injection elementary stream to reach, employs the purpose of low water cut section remaining oil inside oil reservoir, proposes that 7 kinds of pressures are stifled and drives work
Skill mode carries out condition criterion by well group inefficient cycle, remaining oil and distribution situation, and what preferably purpose oil reservoir was suitble to " presses stifled
Drive " construction technology mode：
Obvious high water logging section is not present in oil reservoir oil-water well both ends（Inefficient cycle）, sand body connectivity is bad, and remaining oil exists
In nearly oil well end or nearly well end, then：
Scheme one, as shown in Figure 4：Remaining oil is close to oil well end, in oil well end reservoir top hyposmosis position pressure break seam, injection
The oil displacement agent displacement of reservoir oil, handling up out by oil well end plays displacement of reservoir oil effect, Remaining Oil；
Scheme two, as shown in Figure 5：Remaining oil is close to well end, and in well end reservoir top Thief zone section pressure break seam, injection is driven
The finish displacement of reservoir oil, subsequent conventional injection fluid, replaces out, Remaining Oil oil displacement agent slug.
There is obvious high water logging section in oil reservoir oil well end（Inefficient cycle）, if sand body is connected to, remaining oil is close to oil well
End, if sand body connection is bad, remaining oil is present between oil-water well, then：
Scheme three, as shown in Figure 6：Remaining oil is close to oil well end, and in oil well end reservoir lower part Thief zone section pressure break seam, injection is stifled
Agent is blocked, and is subsequently implanted into fluid at oil well end and is streamed Remaining Oil；
Scheme four, as shown in Figure 7：Remaining oil, in well end lower part Thief zone section pressure break seam, injects blocking agent among oil-water well
It is blocked, while in oil well end reservoir top hyposmosis section pressure break seam, injecting the oil displacement agent displacement of reservoir oil.Promote low in fluid entrance
Permeable formation improves well group oil displacement efficiency, Remaining Oil.
There is obvious high water logging section in oil reservoir well end（Inefficient cycle）, if sand body is connected to, remaining oil is close to well
End, if sand body connection is bad, remaining oil is present between oil-water well, then：
Scheme five, as shown in Figure 8：Remaining oil is among oil-water well, in oil well end reservoir top hyposmosis section pressure break seam, injection
The oil displacement agent displacement of reservoir oil, while in well end reservoir lower part Thief zone section pressure break seam, it injects blocking agent and is blocked, fluid is promoted to enter
Middle less permeable layer improves well group oil displacement efficiency, Remaining Oil.
Scheme six, as shown in Figure 9：Remaining oil is close to well end, in well end reservoir lower part Thief zone section pressure break seam, note
Enter blocking agent to be blocked, is subsequently implanted into fluid at well end and streams displacement remaining oil position；
There is obvious high water logging section in oil reservoir oil-water well both ends（Inefficient cycle）, sand body is connected to, and remaining oil is present in grease
Oil reservoir top between well, oil reservoir lower part injection fluid inefficient cycle is serious, then：
Scheme seven, as shown in Figure 10：In oil-water well both ends oil reservoir lower part, Thief zone section corresponds to pressure break seam, and injection blocking agent is sealed
Stifled, Remaining Oil is washed in less permeable layer drive in subsequent fluid entrance.
The application technology pattern preferred method is described further below with reference to specific embodiment：
Embodiment 1
Experiment well is Daqing placanticline one kind oil reservoir B1-6-P68 well.
B1-6-P68 well is the extraction old well of well after the poly- drive of a bite, October 10 1996 finishing drilling time.The well oil-water well away from
175m, well depth 1166.71m, perforated interval 1068.9~1097.7m of depth penetrate out PI1~PI7 and amount to 8 substratums, wherein wrapping
Include PI2 substratum.
（1）Purpose well group data preparation
Well group reservoir development
Purpose well group is in horizontal well group test block edge, and intermediate 1 mouthful of oil well, separately there are 6 mouthfuls of injection wells on periphery.The well exploits purpose
Layer belongs to river-delta sedimentary system, and PI2 unit category flood plain is mutually high to be bent large-scale compound meandering stream deposit, reservoir point bar
Sand body development.
From the development of well group accurate reservoir description sand body as can be seen that B1-6-P68 well PI2 unit and 6 mouthfuls of injection wells are river
The connection of road sand one kind, channel sand controlling extent 100%.
B1-6-P68 well development dynamic
Poly- drive of the well in August, 1997 is gone into operation, and aqueous up to 92.48% after 4 months, is transferred to subsequent waterflooding in March, 2003, and 2008
Last High water cut closing well, horizontal well group development experiments opening well and making production in 2013, daily output liquid 181t, day oil-producing 0.1t, aqueous 99.9%.
Reservoir Geologic analysis
This well mainly exploits Putaohua reservoir, and PI1 ~ PI7 substratum well point permeability is at 0.44~1.17 μm2, main force's reservoir PI2 group
Oil reservoir development thickness is big, and 1.17 μm of maximum permeability2, dominant flowing path development.From substratum water logging interpretation results figure it is found that
PI2b substratum hole infiltration condition is preferable, and high water logging is main fluid producing layer（Preferably in construction advance annulus logging, in conjunction with latest data,
Implement main fluid producing layer）.
Available data unanimously confirms, PI2b layers are high Water out zone in oil reservoir, since PI2 layer of well group be channel sand one kind company
It is logical, determine that there are inefficient cycles between well group oil-water well.
Remaining oil distribution situation
It studies from reservoir Numerical Simulation of Remaining Oil and is enriched with relatively it is found that gathering PI2 layers of top remaining oil after drive, be mainly distributed on nearly oil
At 1/3 distance of well end, oil saturation 44.6%, bottom remaining oil is less, oil saturation 26.3%, and it is remaining that this well controls reservoir
3.6 ten thousand tons of recoverable reserves, it is contemplated that improve recovery percent of reserves 8%, 2880 tons of crude oil can be produced.
（2）The stifled drive technology pattern of pressure is preferred
It is analyzed by above data it has been confirmed that there is 1 mouthful of oil well, 6 mouthfuls of well saliva wells in well group, it is river that construction target zone, which is PI2 group oil reservoir,
The connection of road sand body one kind, it is poly- drive after form macropore, inefficient cycle is serious between oil-water well, produce liquid 181t daily at present, day oil-producing
0.1t, remaining oil are present at nearly 1/3 well spacing of oil well end, need to carry out water-control oil-increasing measure, the preferred thinking of construction technology mode
Such as scheme as follows：There are inefficient cycle → inefficient cycles to be present in oil well end → remaining oil distribution close to oil well → oil well end for the well group
Press deblocking technology mode.
By this method it is preferred after, can be performed scheme three preferred result, B1-6-P68 well PI2 oil reservoir group implement oil well
Pressure break deblocking technology blocks the group oil reservoir bottom oil well end PI2 and injects water inefficient cycle, produces injection water inside the oil reservoir of nearly oil well end
Life is streamed, and oil reservoir top low water cut section remaining oil is linked up, and improves oil reservoir recovery percent of reserves.
The well construction time is on November 24th, 2017, daily output liquid 162.05t before pressing, day oil-producing 0.16t, aqueous 99.9%,
Monthly Liquid output continues to decline after measure, current monthly production liquid 146.46t, day oil-producing 2.11t, and aqueous 98.56%, it is raw from oil well
Production dynamic, which can be seen that fracturing plugging technological measure, reduces oil well end production fluid inefficient cycle, has seen preferable increasing oil effect
Fruit.
Embodiment 2
Experiment well is Daqing placanticline one kind oil reservoir L9-PS2133 well.
L9-PS2133 well is that a bite is poly- drive after produce the old well of well, the finishing drilling time on 01 4th, 2008.The well oil-water well away from
150m, well depth 1141.10m, perforated interval 1014.8 ~ 1035.2m of depth penetrate out SIII3~10 and amount to 5 substratums, wherein wrapping
Include SIII3-7 substratum.
（1）Purpose well group data preparation
Well group reservoir development
Purpose well group is in L9-PS2133 well location in one area of BLOCK OF LAMADIAN OIL FIELD northeast block, and 7.1 km2 of block area exploits Sa III 3
~ 10, SIII3-7 layers are the river channel sand developed in flakes, and hole infiltration condition is good, belongs to a kind of reservoir.
From the development of well group accurate reservoir description sand body as can be seen that L9-PS2133 well SIII3-7 unit and 4 mouthfuls of surrounding notes
Entering well is the connection of channel sand one kind, channel sand controlling extent 100%.After III 3 unit subdivision structural unit of Sa, in 9-PS2134
Well note is adopted on direction, and top sand body becomes the connection of two classes from one kind connection.
L9-PS2133 well development dynamic
The well is gone into operation in September, 2008, and go into operation initial stage daily output liquid 52t, day oil-producing 1t, and aqueous 98.8%.To current accumulative oil-producing
13000t, stage recovery percent of reserves 53.3%, current daily output liquid 92t, day oil-producing 2.2t, aqueous 97.6%.
The well has 4 mouthfuls of connection injection wells, and injection condition is stablized, and average day injects 305m3, 2 months were the invalid injection of control,
Diurnal injection is lowered to 235 m3。
Reservoir Geologic analysis
By accurate reservoir description it is found that well group Sa 3-7 oil reservoir is a kind of oil reservoir, connectivity is good, III 3 unit subdivision structure list of Sa
After member, adopted on direction in 9-PS2134 well note, top sand body becomes the connection of two classes from one kind connection, and middle High water cut position mainly collects
In in interval bottom.
Well group intake profile data
By research L9-PS2133 well group intake profile data it is found that the block is to infuse the poly- oil recovery stage at that time, well group 4 is counted
Mouth injection well water suction situation（Such as table 2）, the III 3-7 oil reservoir lower part S water suction ratio is 55.5%, distinguishes high 41.5 and than upper, middle part
25.0 percentage points, be main absorbent section.The block in 2017 enters subsequent waterflooding stage, III 3-7 of SUnderOil reservoir inefficient cycle
Seriously, in order to achieve the purpose that steady oil control water, to III 3-7 of well group SUnderOil reservoir has carried out control water filling.Due to well end SIII3-7OnOil reservoir group water absorption is smaller, injects ripples and remaining oil ability is poor, and the stifled treatment process that drives of well group pressure need to consider that well end is synchronous
Measure.
2 L9-PS2133 well group intake profile data of table
Producing profile testing data
On April 11st, 2018, oil recovery factory in L9-PS2133 well carried out producing profile testing, obtained four parameter combination of production profile
Interpretation of logging data achievement.
L9-PS2133 well SIII3-7UnderInterval 1021.6 ~ 1028m of depth produces liquid data and shows SIII3-7UnderInterval produces liquid
Measure 17.4m3/ d has only accounted for the 22.2% of full well liquid amount, is not main fluid producing layer, illustrates nearly 2 years SIII3-7UnderOil reservoir control
Apparent effect has been seen in system water filling.SIII3-7 at presentOnRise with SIII9+10 Liquid output, full well liquid amount is arrived at station respectively
54.3% and 23.5%, it is contemplated that SIII3-7OnFracturing reform was carried out, and was influenced by waterflooding adjustment, SIII3- within oil reservoir 2013
7OnOil reservoir has formed part advantage seepage flow and has led to, and arranges and explains data（Such as table 3）.
3 L9-PS2133 well production profile of table, four parameter combination interpretation of logging data data
The identification of comprehensive analysis thick oil pay predominant pathway position, well group produce liquid and water suction data, it is believed that oil well end exists at present
SIII3-7OnAnd SIII3-7UnderTwo dominant flowing paths.
The stifled construction technology layer position of driving of pressure determines
Consider to arrive SIII3-7 at presentUnderLayer has reduced the production liquid intensity of this layer by well group water filling regulation, is determined this
Secondary fracturing plugging SIII3-7OnLayer dominant flowing path, 1014.8 ~ 1018.0m of interval depth.
Remaining oil distribution situation
From reservoir Numerical Simulation of Remaining Oil result it is found that L9-PS2133 well SIII4+5 unit oil saturation is higher, on 40% left side
The right side is higher than other units, and remaining oil is relatively enriched with, and comprehensive analysis thinks that there are certain remaining oils in well SIII3-7 thick oil pay.
Carbon-to-oxygen ratio test result shows before pressing：1018.0-1020.0mm depth oil-containing degree of saturation is relatively high, show as
Water logging, remaining oil is opposite to be enriched with.
4 L9-PS2133 well carbon-to-oxygen ratio test result of table
（2）The stifled drive technology pattern of pressure is preferred
It is analyzed by above data it has been confirmed that there is 1 mouthful of oil well, 4 mouthfuls of well saliva wells in well group, construction target zone is SIII3-7OnGroup oil
Layer is that river channel sand one kind is connected to, and subsequent waterflooding adjusts well group waterflood project and forms dominant flowing path, and oil well end exists invalid
Circulation, numerical simulation analysis remaining oil are present among oil-water well at oil well end.At present the well produce daily liquid 92.0t, day oil-producing
2.2t, aqueous 97.6%, need to carry out water-control oil-increasing measure, the preferred thinking of construction technology mode is as follows：There are inefficient cycles for the well
→ oil well end inefficient cycle → remaining oil distribution among oil-water well → oil well pressure is stifled+well pressure drives group technology mode.
By this method it is preferred after, the preferred result of scheme four can be performed, in L9-PS2133 well SIII3-7 group oil reservoir reality
It is stifled to apply wellfracturing, and synchronizes and pressure break displacement of reservoir oil measure is implemented to well L9-PS2134 well, blocks oil well end SIII3-7OnGroup oil reservoir
Bottom output water inefficient cycle makes to inject water and generate inside oil-water well interlude oil reservoir to stream, it is low aqueous to link up oil reservoir top
Position remaining oil improves oil reservoir recovery percent of reserves.
The well group construction time is on April 20th, 2018, current daily output liquid 92t before pressing, day oil-producing 2.2t, aqueous 97.6%.
Well head pressure drops to 1.7MPa from 9.5MPa after L9-PS2133 well measure, completes down to pump at present, well group well L9-
The underground PS2134 enters separate layer water injection string, SIII3-7OnGroup oil reservoir imbibition is obvious, and the stifled measure effect that drives of well group pressure waits for further commenting
Valence.
Embodiment described above is only to express embodiments of the present invention, and the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that those skilled in the art,
Under the premise of not departing from present inventive concept, several deformations, same replacement can also be made, improved etc., these belong to the present invention
Protection scope.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (6)
1. a kind of oil reservoir pressure is stifled to drive technology pattern preferred method, which is characterized in that including：
Determine that data, grease sand body between wells connection situation and remaining oil distribution situation are explained in the water logging of well group；And according to the well
Data, grease sand body between wells connection situation and remaining oil distribution situation are explained in the water logging of group, and selection pressure is stifled to drive technology pattern；It is described
Technology pattern is respectively：
（1）The high water logging section of 0.5m or more is not present in the oil well end and well end of the well group, and the grease sand body between wells connect
The general character is bad, if：
The remaining oil then carries out oil well pressure at the oil well end and drives close to the oil well end；
The remaining oil then carries out well pressure at the well end and drives close to the well end；
（2）There are 0.5m or more water logging sections at the oil well end, if：
The grease sand body between wells connectivity is good, and the remaining oil then carries out oil well at the oil well end close to the oil well end
Pressure is stifled；
The grease sand body between wells connectivity is bad, and the remaining oil is present in the middle part at the oil well end Yu the well end
Position then carries out well pressure at the well end and drives, and stifled in oil well end progress oil well pressure；
（3）There are the high water logging sections of 0.5m or more at the well end, if：
The grease sand body between wells connectivity is good, and the remaining oil then carries out oil well at the oil well end close to the well end
Pressure is driven, and is carried out well pressure at the well end and blocked up；
The grease sand body between wells connectivity is bad, and the remaining oil is present in the centre at the oil well end and the well end,
It is stifled that well pressure then is carried out at the well end；
（4）There is the high water logging section of 0.5m or more in the oil well end and the well end, the grease sand body between wells connectivity is good,
The remaining oil is present in the oil reservoir top between the oil well end and the well end, then carries out oil well pressure at the oil well end
It is stifled, and carry out well pressure at the well end and block up.
2. a kind of oil reservoir pressure according to claim 1 is stifled to drive technology pattern preferred method, it is characterised in that：
The remaining oil refers to that the remaining oil is located in 1/3 well spacing at the oil well end close to the oil well end；The residue
Oil refers to that the remaining oil is located in 1/3 well spacing at the well end close to the well end.
3. a kind of oil reservoir pressure according to claim 1 is stifled to drive technology pattern preferred method, it is characterised in that：
The technology pattern（1）In, the oil well pressure is driven, and is to inject oil displacement agent in reservoir top hyposmosis position pressure break seam
The displacement of reservoir oil is handled up the remaining oil out by the oil well end；Well pressure is driven, be in reservoir top Thief zone section pressure break seam,
The oil displacement agent displacement of reservoir oil is injected, fluid is subsequently implanted into, the fluid replaces out the slug of the oil displacement agent, residue of taping the latent power
Oil.
4. a kind of oil reservoir pressure according to claim 1 is stifled to drive technology pattern preferred method, it is characterised in that：
The technology pattern（2）In, the oil well pressure is stifled, is to inject blocking agent in reservoir lower part Thief zone section pressure break seam and carry out
It blocks, is subsequently implanted into the fluid at the oil well end and streams Remaining Oil；
It is described both to carry out well pressure drive at the well end and stifled in oil well end progress oil well pressure, then：
The well pressure is driven, and is to inject the blocking agent in lower part Thief zone section pressure break seam and blocked；
The oil well pressure is stifled, is to inject the oil displacement agent and the fluid, the drive in reservoir top hyposmosis section pressure break seam
Finish promote the fluid enter in less permeable layer tap the latent power the remaining oil.
5. a kind of oil reservoir pressure according to claim 1 is stifled to drive technology pattern preferred method, it is characterised in that：
The technology pattern（3）In, it is described both to carry out oil well pressure drive at the oil well end, and well pressure is carried out at the well end
It is stifled, then：
The oil well pressure is driven, and is to inject the oil displacement agent and the fluid in reservoir top hyposmosis section pressure break seam；
The well pressure is stifled, is to inject the blocking agent in reservoir lower part Thief zone section pressure break seam and blocked, the oil displacement agent
Promote less permeable layer Remaining Oil in the fluid entrance；
It is described both stifled in well end progress well pressure, it is to inject the blocking agent in reservoir lower part Thief zone section pressure break seam
It is blocked, is subsequently implanted into the fluid at the well end and streams displacement remaining oil position.
6. a kind of oil reservoir pressure according to claim 1 is stifled to drive technology pattern preferred method, it is characterised in that：
The technology pattern（4）In, it is described both stifled in oil well end progress oil well pressure, and well pressure is carried out at the well end
It is stifled, it is to correspond to pressure break seam in oil reservoir lower part Thief zone section, injects the blocking agent and blocked, is subsequently implanted into the fluid and enters
Remaining Oil is washed in middle less permeable layer drive.
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Effective date of registration: 20211220 Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Patentee after: Daqing Oilfield Co.,Ltd. Patentee after: PetroChina Co Ltd Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Patentee before: Daqing Oilfield Co.,Ltd. |