CN107575205A - A kind of combination well pattern distribution method for being used for fine and close oily Efficient Development - Google Patents
A kind of combination well pattern distribution method for being used for fine and close oily Efficient Development Download PDFInfo
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- CN107575205A CN107575205A CN201710816383.3A CN201710816383A CN107575205A CN 107575205 A CN107575205 A CN 107575205A CN 201710816383 A CN201710816383 A CN 201710816383A CN 107575205 A CN107575205 A CN 107575205A
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Abstract
A kind of combined shaft screen cloth for being used for fine and close oily Efficient Development is set and water-filling method, including (1) well pattern is laid；(2) water injection well is laid；(3) water injection well being drilled with to step (2) carries out pressurized water injection in 38 months before oil development.Through showing the research of different well-pattern systems, if research area, using rhombic inverted nini-spot well pattern, optimal well array pitch is 480 × 180m；Square well pattern optimal well-spacing is used as 260m；Use staggeredly row well pattern optimal well array pitch for 440 × 160m；In waterflooding extraction, optimal waterflood timing is that 38 months in advance waterflooding extractions can obtain optimum efficiency；Reasonable well type optimization layout shows that research area is adopted using 5 points of mixing well pattern straight well water filling horizontal wells of square can obtain preferable development effectiveness.
Description
Technical field
The present invention relates to oil development and exploration correlative technology field, more particularly, it relates to which a kind of be used to cause
The combination well pattern distribution method of close oily Efficient Development.
Background technology
Oil is of great rarity as important mineral resources.During oil exploitation, lead to improve the recovery ratio of oil
Often divide three phases：Primary oil recovery, by the natural energy on stratum is fuel-displaced, recovery ratio is below 30%；Secondary oil recovery, using note
Water, air insufflation techiques are fuel-displaced to supplement oil reservoir energy, and recovery ratio can be improved to 40-50%；Tertiary oil recovery, utilize physical chemistry and life
The enhanced recovery remaining reserves such as thing, recovery ratio can be improved to 80-85% or so.And generally use is noted during secondary oil recovery
Water, air insufflation techiques are fuel-displaced to supplement oil reservoir energy, however, the above three stage wants the oil recovery factor obtained, it is just necessary
An optimal well pattern layout scheme is taken, not only to have well head number and the optimum utility of development efficiency concurrently, and to rationalize
Distribution sets the layout of water injection well and producing well, to ensure the lasting harvesting effect of crude oil.
The technical purpose of the present invention is a kind of combination well pattern distribution method for being used for fine and close oily Efficient Development of Improvement,
The exploitation of fine and close oily (viscous crude) is particularly directed to, the layout of water injection well, producing well and inspection well is laid by optimizing, is improved most
The proportioning of good all kinds of wells of well spacing and well pattern and distribution, the production efficiency of fine and close oil is improved, can not only improve conventional survey and adopt
The sky high cost that the blindness and well pattern of oily drilling well are laid, also effectively increase the overall recovery ratio in oil field.
The content of the invention
A kind of combined shaft screen cloth for being used for fine and close oily Efficient Development is set and water-filling method, it is characterised in that：The distribution method
Comprise the following steps：
(1) well pattern is laid：Equidistant drill-well operation is carried out in undeveloped oilfields region and carries out well pattern laying, and the well pattern is in
Rhombic inverted nini-spot well pattern, square well pattern or staggeredly row well pattern；It is laid out using three kinds of well patterns, selection is optimized, for opening
The high efficiency of fine and close oil is adopted, there is positive Improvement effect.
(2) water injection well is laid：By the rhombic inverted nini-spot well pattern described in step (1), square well pattern or staggeredly row pattern well
The medium position of each rhombus, square or staggered well pattern in net is drilled with water injection well；Medium position sets water injection well, can effectively carry
High flood effectiveness, promote the lifting of tar productivity；
(3) water injection well being drilled with to step (2) carries out pressurized water injection in 3-8 months before oil development.Research has shown that
Carry out water flood operations within 6 months before oil mining, there is more significant effect, it can be ensured that lasting high oil-producing promotes to make
With；
Preferably, the well pattern in the step (1) assumes diamond in shape inverted nine-spot pattern, and drilling mode is horizontal well；The step
(2) drilling mode of the water injection well in is peupendicular hole.
Preferably, the square five-spot pattern of well pattern in the step (1), drilling mode are horizontal well and peupendicular hole
Mixed type；The drilling mode of water injection well in the step (2) is peupendicular hole.
As optimization, the well array pitch of the rhombic inverted nini-spot well pattern in the step (1) is 480 × 180m.
As optimization, the square well pattern in the step (1) is specially square inverted nine-spot pattern, and its well spacing is
260m。
Highly preferred, the well array pitch of the staggeredly row well pattern in the step (1) is 440 × 160m.
The technical solution used in the present invention is set and water-filling method for the combined shaft screen cloth of fine and close oily Efficient Development,
(1) through showing the research of different well-pattern systems, if research area using rhombic inverted nini-spot well pattern, optimal well array pitch is 480 ×
180m；Square well pattern optimal well-spacing is used as 260m；Use staggeredly row well pattern optimal well array pitch for 440 × 160m.
(2) reasonable development method optimizing research shows that research area's natural energy is small, using natural energy development effectiveness pole
Difference, it is necessary to take artificial supplementation energy to develop.In waterflooding extraction, optimal waterflood timing is 3-8 month waterflooding extraction energy in advance
Obtain optimum efficiency.
(3) rationally well type optimization layout shows, energy is adopted using 5 points of mixing well pattern straight well water filling horizontal wells of square by research area
Obtain preferable development effectiveness.
Brief description of the drawings
Fig. 1 be the present invention be used for fine and close oily Efficient Development combined shaft screen cloth set and water-filling method described in anti-9 wells of rhombus
Net layout schemes；
Fig. 2 be the present invention be used for fine and close oily Efficient Development combined shaft screen cloth set and water-filling method described in square well pattern cloth
Office's figure；
Fig. 3 be the present invention be used for fine and close oily Efficient Development combined shaft screen cloth set and water-filling method described in staggeredly row well pattern
Layout；
Fig. 4 be the present invention be used for fine and close oily Efficient Development combined shaft screen cloth set and water-filling method described in the pressurized water injection time
To the contrast table figure of oil recovery block pressure influence；
Fig. 5 is the mixed accumulative harvesting amount statistical form of different well type.
Description of symbols：
1- drilling wells, 2- water injection wells.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment and match somebody with somebody
Than the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only explaining this hair
It is bright, it is not intended to limit the present invention.
(1) diamond shaped pattern difference well spacing optimizes
Devise 5 kinds of schemes for rhombic inverted nini-spot well pattern, respectively 360 × 160m, 400 × 160m, 440 × 160m,
480 × 160m, 520 × 160m, concrete scheme design are shown in Table 8-1.Well site deployment such as Fig. 1, design diamond shaped pattern long-diagonal side
To consistent with principal direction of stress.
Table 8-1 rhombic inverted nini-spot well pattern rational spacing between wells conceptual designs
| Scheme | Well spacing (m) | Array pitch (m) | The mode of production | Oil well number | Well number |
| Scheme 1 | 360 | 160 | Determine liquid (3 side) | 170 | 55 |
| Scheme 2 | 400 | 160 | Determine liquid (3 side) | 150 | 52 |
| Scheme 3 | 440 | 160 | Determine liquid (3 side) | 138 | 45 |
| Scheme 4 | 480 | 160 | Determine liquid (3 side) | 125 | 42 |
| Scheme 5 | 520 | 160 | Determine liquid (3 side) | 114 | 39 |
From the point of view of Fig. 2,440 meters of well spacing recoverys percent of reserves are minimum, and effect is worst, and 360 meters, 400 meters produce journey with 480 meters of well spacings
Degree is suitable, 520 meters of well spacing recovery percent of reserves highests, but 520 meters of well spacing rate of oil productions are low.Therefore 480 meters of well spacing effects of Integrated comparative
Fruit is best.
(2) diamond shaped pattern difference array pitch optimizes
Devise the scheme of 5 kinds of different array pitch, respectively 360 × 160m on the basis of rhombic inverted nini-spot well pattern, 400 ×
160m, 440 × 160m, 480 × 160m, 520 × 160m, specific design are shown in Table 8-2.Well pattern layout is consistent with Fig. 1.
The reasonable array pitch conceptual design of table 8-2 rhombic inverted nini-spot well patterns
| Scheme | Well spacing (m) | Array pitch (m) | The mode of production | Oil well number | Well number |
| Scheme 1 | 480 | 140 | Determine liquid (3 side) | 144 | 50 |
| Scheme 2 | 480 | 160 | Determine liquid (3 side) | 125 | 41 |
| Scheme 3 | 480 | 180 | Determine liquid (3 side) | 110 | 39 |
| Scheme 4 | 480 | 200 | Determine liquid (3 side) | 98 | 34 |
Found through investigation and comparison, the lower 140 meters of array pitch recovery percent of reserves highest of four kinds of array pitch, 180 meters of array pitch and 140 meters of array pitch are big
Cause quite, 160 meters of array pitch and 200 meters of array pitch recoverys percent of reserves are slightly lower；Initial stage, production rate was high during 140 meters of array pitch, but needed portion
The well of administration is also more, therefore it is best to consider 180 meters of array pitch effects.
(3) square well pattern difference well spacing optimization
As shown in figure 3, for devising 5 kinds of schemes, respectively 220m, 240m, 260m on the basis of square well pattern,
280m, 320m, specific design are shown in Table 8-3.Well site deployment is as shown in figure 3, well row direction and principal direction of stress oblique.
Table 8-3 square well pattern rational spacing between wells conceptual designs
| Scheme | Well spacing (m) | The mode of production | Oil well number | Well number |
| Scheme 1 | 220 | Determine liquid (3 side) | 190 | 70 |
| Scheme 2 | 240 | Determine liquid (3 side) | 159 | 54 |
| Scheme 3 | 260 | Determine liquid (3 side) | 134 | 54 |
| Scheme 4 | 280 | Determine liquid (3 side) | 120 | 40 |
| Scheme 5 | 320 | Determine liquid (3 side) | 91 | 34 |
Found through investigation and comparison, for square well pattern, 220 meters of well spacing and initial stage, rate of oil production was high while aqueous when 240
Rising is also fast, and the well that need to be disposed is also more, 260 meters of well spacing recovery percent of reserves highests, therefore comprehensive analysis thinks 260 meters of development effectiveness
It is best.
(4) row well pattern difference of interlocking well spacing optimizes
For the different array pitch schemes of 5 kinds of row pattern well network design of interlocking, respectively 440 × 160m, 480 × 160m, 520 ×
160m, specific design are shown in Table 8-4.Well site deployment is as shown in figure 5, well row direction is vertical with principal direction of stress.
Table 8-4 interlocks row well pattern rational spacing between wells conceptual design
To every development index such as tired oil-producing of different schemes, produce per year, moisture content is contrasted with recovery percent of reserves relation
Analysis, under identical well spacing, the either tired oil-producing of 440 meters of well spacing schemes or annual output and moisture content and recovery percent of reserves relation
The equal effect of curve is best, and 520 meters of well spacing effects are worst.
(5) row well pattern difference of interlocking array pitch optimizes
Devise 5 kinds of different array pitch schemes on the basis of staggeredly row well pattern, respectively 480 × 120m, 480 × 140m,
480×160m、480×180m、480×200m；
Table 8-5 interlocks row pattern Well Pattern And Spacing difference array pitch conceptual design
| Scheme | Well spacing (m) | Array pitch (m) | The mode of production | Oil well number | Well number |
| Scheme 1 | 480 | 120 | Determine liquid (3 side) | 109 | 55 |
| Scheme 2 | 480 | 140 | Determine liquid (3 side) | 93 | 48 |
| Scheme 3 | 480 | 160 | Determine liquid (3 side) | 84 | 42 |
| Scheme 4 | 480 | 180 | Determine liquid (3 side) | 71 | 37 |
| Scheme 5 | 480 | 200 | Determine liquid (3 side) | 68 | 34 |
Through investigation and comparison different schemes, development effectiveness is worst during 140 meters of array pitch, and development effectiveness is best during 160 meters of array pitch
When 160 meters of array pitch, final recovery percent of reserves highest, and also its moisture content rises relatively slow, but recovery percent of reserves is only second to arrange
Away from 120 meters, but the aqueous rising of 120 meters of array pitch is faster, and the well that 120 meters of needs of array pitch are disposed is more.Therefore, synthesis is various
Development index thinks that effect is best during 160 meters of array pitch.
Reasonable development method optimizing
6 kinds of schemes, respectively water filling in 3 months in advance, in advance water filling in 6 months, synchronous note are devised to reasonable development scheme
Water, exploited using natural energy straight well, using natural energy horizontal wells, lag water filling in 3 months, specific design is shown in Table 8-6.
Table 8-6 reasonable development mode conceptual designs
Found through investigation and comparison, either straight well or horizontal well, take natural energy exploitation can not all obtain open
Send out effect, it is therefore necessary to take waterflooding extraction.Carry first trimester and carry first six months to the actively impact of block recovery percent of reserves all
It is obvious that but pressure shift to an earlier date and be maintained within 3 months between the 100%-120% of reset pressure, and 6 months in advance notes then pressure mistake
Height, therefore select to shift to an earlier date water filling in 3 months.
Although straight well water filling horizontal well adopts relatively fast, the extraction under the well pattern of aqueous rising under square five-spot pattern
It is best that degree highest, well yield also highest, therefore 5 points of mixing well pattern straight well water filling horizontal wells adopt development effectiveness.
Therefore, shown according to the specific research of the present embodiment, the technical scheme of preferred embodiment is：
Combined shaft screen cloth for fine and close oily Efficient Development is set and water-filling method, the distribution method comprise the following steps：
Well pattern is laid：Equidistant drill-well operation is carried out in undeveloped oilfields region and carries out well pattern laying, and the well pattern is in water chestnut
Shape inverted nine-spot pattern, square well pattern or staggeredly row well pattern；It is laid out using three kinds of well patterns, optimizes selection, for exploitation
The high efficiency of fine and close oil, has positive Improvement effect.
Water injection well is laid：By the rhombic inverted nini-spot well pattern described in step (1), square well pattern or staggeredly in row well pattern
Each rhombus, the medium position of square or staggered well pattern be drilled with water injection well；Medium position sets water injection well, can effectively improve note
Water effect, promote the lifting of tar productivity；
The water injection well being drilled with to step (2) carries out pressurized water injection in 3-8 months before oil development.Research has shown that
Carry out water flood operations within 6 months before oil mining, there is more significant effect, it can be ensured that lasting high oil-producing facilitation；
Well pattern in step (1) assumes diamond in shape inverted nine-spot pattern, and drilling mode is horizontal well；Water filling in the step (2)
The drilling mode of well is peupendicular hole.
Preferably, the square five-spot pattern of well pattern in step (1), drilling mode are the mixing of horizontal well and peupendicular hole
Type；The drilling mode of water injection well in the step (2) is peupendicular hole.
The well array pitch of rhombic inverted nini-spot well pattern in step (1) is 480 × 180m.
Square well pattern in step (1) is specially square inverted nine-spot pattern, and its well spacing is 260m.
The well array pitch of staggeredly row well pattern in step (1) is 440 × 160m.
The explanation of technique effect：
(1) through showing the research of different well-pattern systems, if research area is using rhombic inverted nini-spot well pattern, optimal well array pitch
480×180m；Square well pattern optimal well-spacing is used as 260m；Use staggeredly row well pattern optimal well array pitch for 440 × 160m.
(2) reasonable development method optimizing research shows that research area's natural energy is small, using natural energy development effectiveness pole
Difference, it is necessary to take artificial supplementation energy to develop.In waterflooding extraction, optimal waterflood timing is 3-8 month waterflooding extraction energy in advance
Obtain optimum efficiency.
(3) rationally well type optimization layout shows, energy is adopted using 5 points of mixing well pattern straight well water filling horizontal wells of square by research area
Obtain preferable development effectiveness.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (6)
1. a kind of combined shaft screen cloth for being used for fine and close oily Efficient Development is set and water-filling method, it is characterised in that：The distribution method bag
Include following steps：
(1) well pattern is laid：Equidistant drill-well operation is carried out in undeveloped oilfields region and carries out well pattern laying, and the well pattern assumes diamond in shape
Inverted nine-spot pattern, square well pattern or staggeredly row well pattern；
(2) water injection well is laid：By the rhombic inverted nini-spot well pattern described in step (1), square well pattern or staggeredly in row well pattern
Each rhombus, the medium position of square or staggered well pattern be drilled with water injection well；
(3) water filling being drilled with to step (2), which is entered 3-8 months before oil development, carries out pressurized water injection.
2. the combined shaft screen cloth for being used for fine and close oily Efficient Development as described in claim 1 is set and water-filling method, its feature exist
In：Well pattern in the step (1) assumes diamond in shape inverted nine-spot pattern, and drilling mode is horizontal well；Water injection well in the step (2)
Drilling mode be peupendicular hole.
3. the combined shaft screen cloth for being used for fine and close oily Efficient Development as described in claim 1 is set and water-filling method, its feature exist
In：The square five-spot pattern of well pattern in the step (1), drilling mode are the mixed type of horizontal well and peupendicular hole；It is described
The drilling mode of water injection well in step (2) is peupendicular hole.
4. the combined shaft screen cloth for being used for fine and close oily Efficient Development as described in claim 1 is set and water-filling method, its feature exist
In：The well array pitch of rhombic inverted nini-spot well pattern in the step (1) is 480 × 180m.
5. the combined shaft screen cloth for being used for fine and close oily Efficient Development as described in claim 1 is set and water-filling method, its feature exist
In：Square well pattern in the step (1) is specially square inverted nine-spot pattern, and its well spacing is 260m.
6. the combined shaft screen cloth for being used for fine and close oily Efficient Development as described in claim 1 is set and water-filling method, its feature exist
In：The well array pitch of staggeredly row well pattern in the step (1) is 440 × 160m.
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Application publication date: 20180112 |