CN107218024B - The method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern - Google Patents
The method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000035699 permeability Effects 0.000 title claims abstract description 49
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000003129 oil well Substances 0.000 claims abstract description 72
- 239000007924 injection Substances 0.000 claims abstract description 64
- 238000002347 injection Methods 0.000 claims abstract description 64
- 230000000694 effects Effects 0.000 claims abstract description 22
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims description 44
- 239000007788 liquid Substances 0.000 claims description 5
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- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000003643 water by type Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 229910003460 diamond Inorganic materials 0.000 description 14
- 239000010432 diamond Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 238000009738 saturating Methods 0.000 description 2
- 235000003283 Pachira macrocarpa Nutrition 0.000 description 1
- 241001083492 Trapa Species 0.000 description 1
- 235000014364 Trapa natans Nutrition 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
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- 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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- 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
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Abstract
The present invention provides a kind of methods of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, method includes the following steps: step 1: judging the predominant direction in reservoir plane；Step 2: in plane, judge high-water-cut oil-producing well；On longitudinal direction, the high aquifer formation in more set oil reservoirs is judged；Step 3: using the waterflooding effect of oil reservoir as foundation, straticulate exploration is divided；Step 4: for high-water-cut oil-producing well, high watercut layer is blocked；For water injection well, seperated layer water injection is carried out；Step 5: in such a way that the high-water-cut oil-producing well in step 4 is changed into water injection well, rhombic inverted nini-spot well pattern structure is adjusted.Method of adjustment provided by the invention can reduce that permeability is relatively high, non-available waters of thickness larger layers circulation, improve lower permeability, waterflooding effect of thinner thickness layer and reserves exploitation degree, and then oil well output is improved, improve rate of oil production, the economic benefit of final waterflood recovery efficiency factor and oil reservoir development.
Description
Technical field
The invention belongs to the field of petroleum exploitation of multilayer sandstone oil reservoir, and in particular to a kind of multilayer low permeability sandstone reservoir is high
The method of adjustment of Water-cut Period rhombic inverted nini-spot well pattern.
Background technique
Low-permeability oil deposit refers to that ground level air infiltration rate is less than the oil reservoir of 50mD.China has put into the hyposmosis of exploitation at present
Oil field, largely belongs to river-delta deposit type, reservoir have in the plane certain heterogeneity and it is infiltrative respectively to
It is anisotropic.On longitudinal direction, the oil-containing number of plies is more, and well section is longer, and interlayer heterogeneity is stronger.The type oil reservoir development generally uses diamond shape anti-
Nine-spot pattern (see Fig. 1).After long-term injecting water, oil reservoir comprehensive water cut is begun to ramp up.When comprehensive water cut be greater than 60% when, the oil reservoir into
Enter high water-cut development period.In this period, due to the influence of interlayer permeability contrast, it is prominent that single layer water filling occurs in multilayer sandstone oil reservoir
The problems such as serious into phenomenon, each layer waterflooding effect difference is big, reserves exploitation degree is unbalanced, water consumption increases.This is because, seeping
Saturating rate is relatively high, the filtrational resistance of the biggish layer of core intersection is small, and injection water preferentially flows in this kind of layer, causes this layer
Oil well water breakthrough is early, aqueous rising is fast, and waterflooding effect is good, and reserves exploitation degree is high, and non-available water circulation is serious, and water consumption is big；And it seeps
The filtrational resistance of relatively low, thinner thickness the layer of saturating rate is larger, and under the conditions of commingled water injection, injection water enters relative difficulty,
Waterflooding effect is poor, and reserves exploitation degree is low.Therefore, it in order to solve these technical problems, needs to study a kind of low suitable for multilayer
The method of adjustment of the rhombic inverted nini-spot well pattern of permeability sandstone oil reservoir high water-cut stage.
Summary of the invention
In order to achieve the above objectives, the present invention provides a kind of anti-9 wells of multilayer low permeability sandstone reservoir high water-cut stage diamond shape
The method of adjustment of net.To solve the exploitation of multilayer low permeability sandstone reservoir high water-cut stage, there are single layer water fillings to advance by leaps and bounds phenomenon seriously, respectively
The problems such as layer waterflooding effect difference is big, reserves exploitation degree is unbalanced, water consumption increases.
The present invention also provides the multilayer low permeability sandstone reservoir high water-cut stage diamond shape obtained by above-mentioned method of adjustment is anti-
Nine-spot pattern.
In order to achieve the above objectives, the present invention provides a kind of anti-9 wells of multilayer low permeability sandstone reservoir high water-cut stage diamond shape
The method of adjustment of net, wherein method includes the following steps:
Step 1: judge the predominant direction in reservoir plane；
Step 2: in plane, judge high-water-cut oil-producing well；On longitudinal direction, the high aquifer formation in more set oil reservoirs is judged；
Step 3: using the waterflooding effect of oil reservoir as foundation, straticulate exploration is divided；
Step 4: for high-water-cut oil-producing well, high watercut layer is blocked；For water injection well, seperated layer water injection is carried out；
Step 5: in such a way that the high-water-cut oil-producing well in step 4 is changed into water injection well, anti-9 wells of diamond shape are adjusted
Web frame.
Method of adjustment provided by the invention is the predominant direction that reservoir is considered in a kind of plane, and reservoir infiltration is considered on longitudinal direction
Sex differernce has good in conjunction with the method for adjustment of the rhombic inverted nini-spot well pattern of the technologies such as seperated layer water injection, water blockoff and artificial fracturing
Application prospect.
In the art, when the moisture content of oil well is higher than 60%, it is considered that the oil well is high-water-cut oil-producing well；When aqueous
When the moisture content of layer is higher than 60%, it is considered that the water-bearing layer is high aquifer formation.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
State in step 1, judge the predominant direction in reservoir plane foundation include sand thickness distributed data, reservoir permeability respectively to
Anisotropic data, the intrinsic fracture data of core observation, artificial fracture directional surveillance data or dynamic analysis data.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
It states in step 2, judges that the foundation of the high aquifer formation in more set oil reservoirs includes oil well liquid-producing sectional data, profile-log of water injection
Data or Submerged Layer Logging Interpretation data.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
It states in step 3, judges that the data of reservoir water flooding effect includes core intersection data, permeability value data or provides every thickness of interlayer
Material.The step is distinguished to the oil reservoir of the good oil reservoir of waterflooding effect and waterflooding effect difference, to divide straticulate exploration；Usually
In the case of, the waterflooding effect for the oil reservoir that core intersection is big, permeability is relatively high is good；Core intersection is smaller, permeability relatively
The waterflooding effect of small oil reservoir is poor.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
It states in step 4, the mode for blocking high watercut layer is machine plugging or chemical plugging.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
It states in step 4, is to realize seperated layer water injection in such a way that packer card seals.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
It states in step 5, the detailed process that high-water-cut oil-producing well is changed into water injection well includes:
(1) normal production is implemented to the high-water-cut oil-producing well after closure high watercut layer in step 4, until moisture content is again
More than High water cut boundary；
(2) oil well is then changed into water injection well and carries out water injection work.
In the method for adjustment of above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that upper
It states in step (2), the water injection work is to carry out seperated layer water injection using mode identical with the water injection well in step 4.
The present invention separately provides a kind of multilayer low permeability sandstone reservoir high water-cut stage water chestnut obtained by above-mentioned method of adjustment
Shape inverted nine-spot pattern, in the well pattern, at least a bite high-water-cut oil-producing well in former well pattern has been converted to the water filling in existing well pattern
Well.
In above-mentioned multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, it is preferable that the height in former well pattern
Aqueous well all has been converted to the water injection well in existing well pattern.
Scheme provided by the invention can be good at the exploitation of solution multilayer low permeability sandstone reservoir high water-cut stage, and there are single layers
Fill the water the problems such as phenomenon of advancing by leaps and bounds is serious, each layer waterflooding effect difference is big, reserves exploitation degree is unbalanced, water consumption increases.This hair
The method of adjustment of bright offer can reduce that permeability is relatively high, non-available waters of thickness larger layers circulation, improve permeability it is lower,
The waterflooding effect and reserves exploitation degree of thinner thickness layer, and then oil well output is improved, improve rate of oil production, the harvesting of final water drive
The economic benefit of rate and oil reservoir development.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the rhombic inverted nini-spot well pattern schematic diagram in background technique；
Fig. 2 is the flow chart of a specific embodiment of rhombic inverted nini-spot well pattern method of adjustment of the invention；
Fig. 3 is the seperated layer water injection and oilwell water shutoff schematic diagram of the embodiment of the present invention 1；
Fig. 4 is that the rhombic inverted nini-spot well pattern of the embodiment of the present invention 2 adjusts the schematic diagram of structure；
Fig. 5 is that the rhombic inverted nini-spot well pattern of the embodiment of the present invention 3 adjusts the schematic diagram of structure.
The appended drawing reference of the figures above: 1, corner well；2, end hole；3, corner well；4, end hole；5, corner well；6, end hole；7, corner well；
8, end hole；9, water injection well；10, the line of the anti-9 flooding pattern structural units of diamond shape；11, packer；12, distributing tap.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment below is specifically described implementation process of the invention by taking anti-9 well groups of a diamond shape as an example.Diamond shape is anti-
The long-diagonal of nine-spot pattern is partly called well spacing, is denoted as a；Short diagonal is partly called array pitch, is denoted as b.
Embodiment 1
Present embodiments provide a kind of method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern
Specific implementation process.Such as the flow chart that Fig. 2 is rhombic inverted nini-spot well pattern method of adjustment in the present embodiment.
In step 201, the predominant direction in reservoir plane is judged；Detailed process are as follows:
According to sand thickness distributed data, reservoir permeability anisotropy data, the intrinsic fracture data of core observation, people
The data such as work pressure-break directional surveillance and dynamic analysis, judge the predominant direction in reservoir plane.
The almost the same direction of sand thickness is the predominant direction in reservoir plane；On the contrary, be perpendicularly to the direction, it is
Non-advantage direction in reservoir plane.
According to reservoir permeability anisotropy data, the big direction of penetration value is the predominant direction in reservoir plane；
On the contrary, be perpendicularly to the direction, it is the non-advantage direction in reservoir plane.
The direction that rock core intrinsic fracture extends, is the predominant direction in reservoir plane；Opposed vertical is storage in the direction
Non-advantage direction on layer plane.
The direction that artificial fracture extends, is the predominant direction in reservoir plane；Opposed vertical is reservoir in the direction
Non-advantage direction in plane.
According to dynamic analysis, in a rhombic inverted nini-spot well pattern unit, in the oil well closed on that is connected with water injection well,
The line direction of the highest oil well of daily fluid production rate highest, moisture content and water injection well is the predominant direction of reservoir.
Under normal conditions, the predominant direction in reservoir plane differentiated according to this five kinds of data is consistent.In example 1
In, by permeability anisotropy's data and dynamic analysing method, determine the folder of reservoir predominant direction and diamond shape long-diagonal
Angle is less than 0.5arctan (2b/a), i.e. reservoir predominant direction and No. 7 wells and No. 3 well line directions is almost the same.Process enters
Step 202.
In step 202, plane, high-water-cut oil-producing well is judged；On longitudinal direction, the high aquifer formation in more set oil reservoirs is judged；Specifically
Process are as follows:
In plane, the oil well of High water cut is judged.When the moisture content of oil well is higher than 60%, that is, think that the oil well is High water cut
Oil well.As shown in figure 1, the moisture content of No. 1 oil well is 58% to example, and the moisture content of No. 2 oil wells is 70%, and the moisture content of No. 3 oil wells is
58%, the moisture content of No. 4 oil wells is 70%, and the moisture content of No. 5 oil wells is 58%, and the moisture content of No. 6 oil wells is 70%, No. 7 oil
The moisture content of well is 58%, and the moisture content of No. 8 oil wells is 70%.So, the oil well of High water cut be No. 2, No. 4, No. 6 and No. 8 this
Four mouthfuls of oil wells (referred to as " end hole ") being located in diamond shape side length, low aqueous oil well is No. 1, No. 3, No. 5 and No. 7 this four mouthfuls and is located at
Oil well (referred to as " corner well ") on dicing.
On longitudinal direction, according to data such as oil well liquid-producing section, profile-log of water injection and Submerged Layer Logging Interpretations, judge more
Cover the high aquifer formation in oil reservoir.Table 1 is the production profile tables of data of No. 2 oil wells, and the layer position of no data is non-oil reservoir.It can be seen that the well
The moisture content of No. 9 floor is higher than 60%, shows that this layer is the oil reservoir of High water cut.
If there is no production profile table, can also be judged with the intake profile data binder course position connected relation of water injection well
The oil reservoir of High water cut.Table 2 is the intake profile tables of data of No. 9 water injection wells, and the layer position of no data is non-oil reservoir.Geological research is thought
No. 9 floor of No. 4 oil wells and No. 9 floor of No. 9 water injection wells have preferable connected relation, but No. 4 oil wells do not have production profile data.
As long as the relative injectivity of a certain oil reservoir of so No. 9 water injection wells is greater than 70%, that is, can determine whether to contain in the height of No. 4 adjacent oil wells
Water layer is exactly the layer.As it can be seen that the high watercut layer of No. 4 oil wells is No. 9 floor.Process enters step 203.
The production profile tables of data of 1 No. 2 oil wells of table
| Layer position | Thickness (m) | Permeability (mD) | It produces daily liquid (t/d) | Moisture content (%) | It is opposite to produce liquid (%) |
| 1 | |||||
| 2 | |||||
| 3 | 1.8 | 2.4 | 1.4 | 36 | 9.6 |
| 4 | |||||
| 5 | 2.6 | 6.2 | 2 | 48 | 13.7 |
| 6 | |||||
| 7 | 1.5 | 1.8 | 1.2 | 42 | 8.2 |
| 8 | |||||
| 9 | 4.2 | 10.6 | 10.4 | 82 | 71.2 |
The intake profile tables of data of 2 No. 9 water injection wells of table
| Layer position | Thickness (m) | Permeability (mD) | Absolute water absorption (m3/d) | Relative injectivity (%) |
| 1 | ||||
| 2 | ||||
| 3 | 1.4 | 1.8 | 3 | 6.7 |
| 4 | ||||
| 5 | 2.8 | 6.4 | 8 | 17.8 |
| 6 | ||||
| 7 | 1.6 | 2.0 | 4 | 8.9 |
| 8 | ||||
| 9 | 4.8 | 14.2 | 32 | 71.1 |
In step 203, the oil reservoir of the good oil reservoir of waterflooding effect and waterflooding effect difference is distinguished, divides straticulate exploration；
Detailed process are as follows:
According to data such as core intersection, permeability values, the good oil reservoir of waterflooding effect and the oil reservoir of waterflooding effect difference are distinguished
It comes, divides straticulate exploration.Under normal conditions, the waterflooding effect for the oil reservoir that core intersection is big, permeability is relatively high is good；Oil reservoir
Thickness is smaller, the waterflooding effect of the relatively small oil reservoir of permeability is poor.It is according to the high watercut layer that step 202 has identified
Therefore No. 3 floor, No. 5 floor and No. 7 floor are divided into the first series of strata, No. 9 floor are divided into the second series of strata by No. 9 floor.Process enters
To step 204.
High watercut layer is blocked for high-water-cut oil-producing well in step 204；For water injection well, seperated layer water injection is carried out；Specifically
Process is (schematic diagram is shown in Fig. 3):
For high-water-cut oil-producing well, using mechanically or chemically blocking high watercut layer.By taking No. 2 oil wells as an example,
High aquifer formation is No. 9 floor, by packer between No. 7 and No. 9 floor, insulates high aquifer formation.For water injection well 9, pass through " double envelopes
The mode of dispensing ", i.e., by the first packer at more than No. 3 floor 3 meters, by the second packer down toward No. 7 floor and No. 9 floor it
Between, the first distributing tap is loaded on the oil pipe between the first and second packers, is loaded on the second packer oil pipe below
Second distributing tap, the depth of distributing tap are equal to the middle part depth of No. 9 floor, are divided to two sections of water fillings to realize.Process enters step
205。
In step 205, in such a way that the high-water-cut oil-producing well in step 4 is changed into water injection well, anti-9 points of diamond shape are adjusted
Well pattern structure；Detailed process are as follows:
In such a way that oil well is changed into water injection well (referred to as " metaideophone "), rhombic inverted nini-spot well pattern structure is adjusted, changed
The flow circuits (referred to as " streamline ") of water in the earth formation are injected, to improve development effectiveness.Reservoir predominant direction and diamond shape length pair
The angle of linea angulata is less than 0.5arctan (2b/a), i.e. reservoir predominant direction and No. 7 wells and when almost the same No. 3 well line directions,
No. 2, No. 4, No. 6 and No. 8 oil wells take packing high aquifer formation operation according to step 204, continue to produce No. 3 floor, No. 5 floor and No. 7
First series of strata of layer composition；No. 9 water injection wells take " double envelope dispensings " operation according to step 204；No. 1, No. 3, No. 5 and No. 7 oil well
Continue normal production.
Embodiment 2:
Present embodiments provide a kind of method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern
Specific implementation process.The flow chart of Fig. 2 is also suitable the present embodiment.
In step 201, by permeability anisotropy's data and dynamic analysing method, determine the predominant direction of reservoir with
The angle of diamond shape long-diagonal be greater than 0.5arctan (2b/a) and be less than 1.5arctan (2b/a) when, i.e., reservoir predominant direction with
No. 6 wells and No. 2 well line directions are almost the same.Process enters step 202.
In step 202, the moisture content of No. 1 oil well is 58%, and the moisture content of No. 2 oil wells is 70%, the moisture content of No. 3 oil wells
It is 58%, the moisture content of No. 4 oil wells is 58%, and the moisture content of No. 5 oil wells is 58%, and the moisture content of No. 6 oil wells is 70%, No. 7
The moisture content of oil well is 58%, and the moisture content of No. 8 oil wells is 58%.So, the oil well of High water cut is No. 2 and No. 6 this two mouthfuls of oil
Well, remaining is low aqueous well.On longitudinal direction, the oil reservoir of High water cut is No. 9 floor.
In step 203, No. 3 floor, No. 5 floor and No. 7 floor are divided into the first series of strata, No. 9 floor are divided into the second series of strata.Stream
Journey enters step 204.
In step 204, for No. 2 and No. 6 oil wells, by packer between No. 7 and No. 9 floor, high aquifer formation is insulated.It is right
It, i.e., will be under the second packer by the first packer at more than No. 3 floor 3 meters by way of " double envelope dispensings " in water injection well
To between No. 7 floor and No. 9 floor, the first distributing tap is loaded on the oil pipe between the first and second packers, in the second packer
The second distributing tap is loaded on oil pipe below, the depth of distributing tap is equal to the middle part depth of No. 9 floor, is divided to two sections of water fillings to realize.
Process enters step 205.
In step 205, No. 2 and No. 6 oil wells take packing high aquifer formation operation according to step 204, continue to produce No. 3 floor,
First series of strata of No. 5 floor and No. 7 floor composition；No. 9 water injection wells take " double envelope dispensings " operation according to step 204；Remaining oil well is just
Often production.After producing a period of time, when the moisture content of No. 2 and No. 6 oil wells reaches 60%, the High water cut of No. 9 floor is no longer insulated
Layer takes " double envelope dispensings " operation using method identical with No. 9 water injection wells, forms the adjustment well pattern such as Fig. 4.Streamline at this time
Become, the injection water flows of No. 6 converted production wells is to No. 5, No. 7 and No. 8 oil wells；The injection water flow of No. 9 water injection wells is to No. 4, No. 5, No. 8
With No. 1 oil well；The injection water flow of No. 2 converted production wells is to No. 3, No. 4 and No. 1 oil wells.The swept volume for expanding injection water, improves
Development effectiveness.
Embodiment 3:
Present embodiments provide a kind of method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern
Specific implementation process.The flow chart of Fig. 2 is also suitable the present embodiment.
In step 201, by permeability anisotropy's data and dynamic analysing method, determine the predominant direction of reservoir with
When the angle of diamond shape long-diagonal is greater than [180 ° of -1.5arctan (2b/a)] and is less than [180 ° of -0.5arctan (2b/a)], i.e.,
Reservoir predominant direction and No. 8 wells and No. 4 well line directions are almost the same.Process enters step 202.
In step 202, the moisture content of No. 1 oil well is 58%, and the moisture content of No. 2 oil wells is 58%, the moisture content of No. 3 oil wells
It is 58%, the moisture content of No. 4 oil wells is 70%, and the moisture content of No. 5 oil wells is 58%, and the moisture content of No. 6 oil wells is 58%, No. 7
The moisture content of oil well is 58%, and the moisture content of No. 8 oil wells is 70%.So, the oil well of High water cut is No. 4 and No. 8 this two mouthfuls of oil
Well, remaining is low aqueous well.On longitudinal direction, the oil reservoir of High water cut is No. 9 floor.
In step 203, No. 3 floor, No. 5 floor and No. 7 floor are divided into the first series of strata, No. 9 floor are divided into the second series of strata.Stream
Journey enters step 204.
In step 204, for No. 4 and No. 8 oil wells, by packer between No. 7 and No. 9 floor, high aquifer formation is insulated.It is right
It, i.e., will be under the second packer by the first packer at more than No. 3 floor 3 meters by way of " double envelope dispensings " in water injection well
To between No. 7 floor and No. 9 floor, the first distributing tap is loaded on the oil pipe between the first and second packers, in the second packer
The second distributing tap is loaded on oil pipe below, the depth of distributing tap is equal to the middle part depth of No. 9 floor, is divided to two sections of water fillings to realize.
Process enters step 205.
In step 205, No. 4 and No. 8 oil wells take packing high aquifer formation operation according to step 204, continue to produce No. 3 floor,
First series of strata of No. 5 floor and No. 7 floor composition；No. 9 water injection wells take " double envelope dispensings " operation according to step 204；Remaining oil well is just
Often production.After producing a period of time, when the moisture content of No. 4 and No. 8 oil wells reaches 60%, the High water cut of No. 9 floor is no longer insulated
Layer takes " double envelope dispensings " operation using method identical with No. 9 water injection wells, forms the adjustment well pattern such as Fig. 5.Streamline at this time
Become, the injection water flows of No. 4 converted production wells is to No. 2, No. 3 and No. 5 oil wells；The injection water flow of No. 9 water injection wells is to No. 1, No. 2, No. 5
With No. 6 oil wells；The injection water flow of No. 8 converted production wells is to No. 1, No. 6 and No. 7 oil well.The swept volume for expanding injection water, improves
Development effectiveness.
Claims (7)
1. a kind of method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern, which is characterized in that the party
Method the following steps are included:
Step 1: judge the predominant direction in reservoir plane；
Step 2: in plane, judge high-water-cut oil-producing well；On longitudinal direction, the high aquifer formation in more set oil reservoirs is judged；
Step 3: using the waterflooding effect of oil reservoir as foundation, straticulate exploration is divided；
Step 4: for high-water-cut oil-producing well, high watercut layer is blocked；For water injection well, seperated layer water injection is carried out；
Step 5: in such a way that the high-water-cut oil-producing well in step 4 is changed into water injection well, rhombic inverted nini-spot well pattern knot is adjusted
Structure；
Wherein, in step 1, judge that the foundation of the predominant direction in reservoir plane includes sand thickness distributed data, reservoir infiltration
Rate anisotropy data, the intrinsic fracture data of core observation, artificial fracture directional surveillance data or dynamic analysis data；
In step 3, judge that the data of reservoir water flooding effect includes core intersection data, permeability value data or every thickness of interlayer
Data；
In step 5, the detailed process that high-water-cut oil-producing well is changed into water injection well includes:
(1) implement normal production to blocking the high-water-cut oil-producing well after high watercut layer in step 4, until moisture content again above
High water cut boundary；
(2) oil well is then changed into water injection well and carries out water injection work.
2. the method for adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern according to claim 1,
It is characterized in that, in above-mentioned steps two, judge the high aquifer formation in more set oil reservoirs foundation include oil well liquid-producing sectional data,
Profile-log of water injection data or Submerged Layer Logging Interpretation data.
3. the method for adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern according to claim 1,
It is characterized in that, the mode for blocking high watercut layer is machine plugging or chemical plugging in above-mentioned steps four.
4. the method for adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern according to claim 1,
It is characterized in that, being to realize seperated layer water injection in such a way that packer card seals in above-mentioned steps four.
5. the method for adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern according to claim 1,
It is characterized in that, (2) step in above-mentioned steps five, the water injection work is using identical with the water injection well in step 4
Mode carries out seperated layer water injection.
6. a kind of multilayer low permeability sandstone reservoir high water-cut stage obtained by the described in any item methods of adjustment of claim 1-5
Rhombic inverted nini-spot well pattern, which is characterized in that in the well pattern, at least a bite high-water-cut oil-producing well in former well pattern has been converted to existing
Water injection well in well pattern.
7. multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern according to claim 6, which is characterized in that
In the well pattern, the high-water-cut oil-producing well in former well pattern all has been converted to the water injection well in existing well pattern.
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