CN102839958B - Longitudinally-superposed-development three-layer-system oil reservoir well pattern and deployment method thereof - Google Patents
Longitudinally-superposed-development three-layer-system oil reservoir well pattern and deployment method thereof Download PDFInfo
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Abstract
The embodiment of the invention provides a three-layer system oil reservoir well pattern which is superposed and developed longitudinally and a deployment method thereof, and for an oil reservoir of three-layer system which is superposed and developed longitudinally, the well spacing of a basic well patternThe well spacing of the intermediate transition well pattern is 2L after the first encryption, two sets of superposed inverse nine-point well patterns with the well spacing of 2L are formed after the second encryption, two sets of well spacings are 2L and one set of well spacing isAfter the overlapped inverse nine-point well patterns are alternately developed two by two, the well spacing of the plane well patterns of each layer series is a reasonable well spacing L, and the evolution process of the well spacing is determined byIncreasing the well spacing to 2L andin the middle process of well pattern conversion, the well distribution uniformity degree and the reserve control speed are increased at the same drilling speed; the well spacing is encrypted in well pattern alternation, each set of well pattern realizes the orderly development of each longitudinal layer system, the utilization rate of the well pattern is improved, simultaneously, the oil deposit is uniformly used, the oil field accumulated oil production is increased, the recovery ratio is improved, and the interlayer interference generated by the combined production of a plurality of oil layers of the longitudinal layer system is avoided.
Description
Technical field
The present invention relates to oil field development deployment and Adjusted Option design, particularly relate to three series of strata oil reservoir well pattern and dispositions methods thereof of stacked growth in a kind of longitudinal direction.
Background technology
At present lower than the waterflooding development of the oil reservoir with multiple series of strata of 10000mPa.s, three kinds of well net deployment methods are usually adopted at more than 4m, viscosity of crude for longitudinal upper stacked individual reservoir thickness: one is dispose separately a set of well pattern (the same well sites of well of the different series of strata of same position) develop separately for often overlapping series of strata, two is that the mode utilizing a set of well pattern to return is successively developed, and three is utilize a set of well pattern to close to adopt longitudinally upper all series of strata.
The well net deployment that oil field development adopts mostly and method of adjustment are anti-9 method → five-spots → development scheme adjustment, as shown in Figure 1, the well pattern thickening conventional for prior art oil field development and method of adjustment schematic diagram, wherein, (a) is anti-9 basic well patterns; B () is anti-9 infilled well patterns; C () is 5 infilled well patterns.For longitudinally above stacked many covers series of strata, conventional a set of well pattern returns exploitation successively, and all well finishing drillings are to oil reservoir foot layer position, and shortcoming is that Development layer series is single, and the multiple zone in longitudinal direction can not be employed simultaneously, and rate of oil production is low, and development efficiency is low; Another kind of conventional method is commingling production, and shortcoming does not consider that between longitudinal layer, otherness causes crossflow and interference, affects development effectiveness; The method be finally of little use beats many mouthfuls of wells in same well site, often overlap a set of independent well pattern of series of strata, as shown in Figure 2, dispose a set of well pattern thickening and method of adjustment schematic diagram for the longitudinal stacked oil reservoir with multiple series of strata of prior art often overlaps series of strata with well site, wherein, (a) is anti-9 basic well patterns; B () is anti-9 infilled well patterns; C () is 5 infilled well patterns.A development well finishing drilling of often overlapping series of strata is to the target zone of corresponding exploitation, and 2 times of shortcoming to be drilling well number be first two hole pattern, investment cost is high, uneconomical.
As can be seen here, longitudinally there are longitudinal series of strata in upper stacked oil reservoir with multiple series of strata process and can not take into account simultaneously in above three kinds of hole patterns exploitation, produce interlayer interference when longitudinal multiple zone is exploited simultaneously or often overlap that the independent a set of well pattern production drilling number of series of strata is too many, investment is large, well pattern utilization rate is low, limitation that deficiency in economic performance etc. is many.
Summary of the invention
The embodiment of the present invention provides three series of strata oil reservoir well pattern and dispositions methods thereof of stacked growth in a kind of longitudinal direction, to develop longitudinal oil reservoir with multiple series of strata, to avoid crossflow and interference simultaneously, improves rate of oil production.
On the one hand, embodiments provide three series of strata oil reservoir well patterns of stacked growth in a kind of longitudinal direction, in described longitudinal direction, three series of strata of stacked growth are followed successively by K, J and M series of strata from top to bottom, and optimal well-spacing is L, and in described longitudinal direction, three series of strata oil reservoir well patterns of stacked growth comprise:
With
well spacing dispose the basic well pattern of J series of strata, all finishing drilling is to M series of strata foot oil reservoir for the basic well pattern of all J series of strata, and metaideophone centerwell simultaneously, forming around a bite well water filling of center the square well spacing that 8 mouthfuls of wells recover the oil is
inverted nine-spot pattern;
After basic well pattern is improved in full oil field, the diagonal central point between adjacent two producing wells in diagonal angle bores infill well, and after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements first time diagonal angle encryption and form the inverted nine-spot pattern exploitation J series of strata that well spacing is 2L;
After first time diagonal angle encryption, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all infill wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, second time laterally encryption forms the square inverted nine-spot pattern exploitation K series of strata oil reservoir that another set of well spacing is 2L, and J series of strata and K series of strata two are overlapped the distance that to stagger between well pattern and are
Dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K series of strata and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
superimposed inverted nine-spot pattern;
K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well patterns: the producing well comprehensive water cut being assumed to be J series of strata and M series of strata rises to after 80% respectively, shutoff J series of strata and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration; When K, J and M tri-overlaps after Grouping of Sand Members And Well exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, K, J and M tri-overlaps Grouping of Sand Members And Well and again exchanges target zone between two, the water drive remaining oil of exploitation the other side series of strata; Through the well pattern thickening of three times, and be adjusted to five-spot pattern by inverted nine-spot pattern three times and three exploitation object series of strata are exchanged, finally make longitudinally upper K, J and M tri-overlap three series of strata oil reservoir well patterns that series of strata all reach stacked growth in longitudinal direction that optimal well-spacing is L.
Optionally, in an embodiment of the present invention, the described optimal well-spacing in three series of strata oil reservoir well patterns of stacked growth in described longitudinal direction is that L determines according to well spacing density.
Optionally, in an embodiment of the present invention, described well spacing density obtains according to following formula:
Wherein, N represents oil in place 10
4t; R
trepresent development period recoverable reserves recovery percent of reserves; P represents oil sale price, unit/t; E
drepresent oil displacement efficiency; B represents design Wells; S represents well spacing density, mouth/km
2; A represents oil area, km
2; M represents individual well gross investment, 10
4unit/mouth; I represents loan interest; T represents the investment payback time, a; C represents operating cost, 10
4unit/(mouth .a); L represents rational well spacing, m.
Optionally, in an embodiment of the present invention, after obtaining described well spacing density S, described optimal well-spacing L is obtained according to following formula:
On the other hand, embodiments provide three series of strata oil reservoir well net deployment methods of stacked growth in a kind of longitudinal direction, in described longitudinal direction, three series of strata of stacked growth are followed successively by K, J and M series of strata from top to bottom, optimal well-spacing is L, and in described longitudinal direction, three series of strata oil reservoir well net deployment methods of stacked growth comprise:
With
well spacing dispose the basic well pattern of J series of strata, all finishing drilling is to M series of strata foot oil reservoir for the basic well pattern of all J series of strata, and metaideophone centerwell simultaneously, forming around a bite well water filling of center the square well spacing that 8 mouthfuls of wells recover the oil is
inverted nine-spot pattern;
After basic well pattern is improved in full oil field, the diagonal central point between adjacent two producing wells in diagonal angle bores infill well, and after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements first time diagonal angle encryption and form the inverted nine-spot pattern exploitation J series of strata that well spacing is 2L;
After first time diagonal angle encryption, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all infill wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, second time laterally encryption forms the square inverted nine-spot pattern exploitation K series of strata oil reservoir that another set of well spacing is 2L, and J series of strata and K series of strata two are overlapped the distance that to stagger between well pattern and are
Dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K series of strata and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
superimposed inverted nine-spot pattern;
K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well patterns: the producing well comprehensive water cut being assumed to be J series of strata and M series of strata rises to after 80% respectively, shutoff J series of strata and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration; When K, J and M tri-overlaps after Grouping of Sand Members And Well exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, K, J and M tri-overlaps Grouping of Sand Members And Well and again exchanges target zone between two, the water drive remaining oil of exploitation the other side series of strata; Through the well pattern thickening of three times, and be adjusted to five-spot pattern by inverted nine-spot pattern three times and three exploitation object series of strata are exchanged, finally make longitudinally upper K, J and M tri-overlap three series of strata oil reservoir well patterns that series of strata all reach stacked growth in longitudinal direction that optimal well-spacing is L.
Optionally, in an embodiment of the present invention, three series of strata oil reservoir well net deployment methods of stacked growth in described longitudinal direction, also comprise:
Determine that described optimal well-spacing is L according to well spacing density.
Optionally, in an embodiment of the present invention, described well spacing density obtains according to following formula:
NR
TPE
DBe
-B/S＝[M(1+i)
T/2+TC]AS
2，
Wherein, N represents oil in place 10
4t; R
trepresent development period recoverable reserves recovery percent of reserves; P represents oil sale price, unit/t; E
drepresent oil displacement efficiency; B represents design Wells; S represents well spacing density, mouth/km
2; A represents oil area, km
2; M represents individual well gross investment, 10
4unit/mouth; I represents loan interest; T represents the investment payback time, a; C represents operating cost, 10
4unit/(mouth .a); L represents rational well spacing, m.
Optionally, in an embodiment of the present invention, after obtaining described well spacing density S, described optimal well-spacing L is obtained according to following formula:
Technique scheme has following beneficial effect: first determine the longitudinal straticulate exploration of oil reservoir and rational spacing between wells, according to well spacing and the middle transition Well Pattern And Spacing of longitudinal germinal layer coefficient determination basic well pattern.Longitudinal superimposed growth three is overlapped to the oil reservoir of series of strata, the well spacing of basic well pattern
through once encrypting middle transition Well Pattern And Spacing 2L, after superencipher, form two cover well spacings is the superimposed inverted nine-spot pattern of 2L, and after Tertiary infilling, form two cover well spacings be 2L and a set of well spacing is
superimposed inverted nine-spot pattern, through between two alternately after exploitation, often overlapping series of strata plane Well Pattern And Spacing is rational well spacing L, well spacing evolution process by
increase well spacing be 2L and
well pattern conversion pilot process, increases well spacing uniformity coefficient and to reserves control rate under identical bit speed; Well spacing is in well pattern alternately middle realization encryption, often overlap well pattern to realize, to the orderly development of longitudinal each series of strata, improving well pattern utilization rate, oil reservoir realizes evenly employing simultaneously, reduce the horizontal contradiction in oil reservoir development process, be conducive to increasing oil field cumulative oil production and improving recovery ratio.When do not implement to close adopt and well number does not increase realize longitudinal oil reservoir and employ simultaneously, avoid longitudinal series of strata multiple zone and close the interlayer interference of adopting generation.In addition, longitudinally how cover series of strata convert five-spot pattern to through the inverted nine-spot pattern under different well spacing repeatedly changes water drive oil direction, and relative conventional method changes a water drive oil direction, improves oil-water displacement efficiency, and slow down rate of water cut increase.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the conventional well pattern thickening of prior art oil field development and method of adjustment schematic diagram;
Fig. 2 be prior art longitudinally stacked oil reservoir with multiple series of strata often overlap series of strata and dispose a set of well pattern thickening and method of adjustment schematic diagram with well site;
Fig. 3 is three series of strata oil reservoir well net deployment schematic diagrames of stacked growth in a kind of longitudinal direction of the embodiment of the present invention;
Fig. 4 is three series of strata oil reservoir well net deployment method flow diagrams of stacked growth in a kind of longitudinal direction of the embodiment of the present invention;
Fig. 5 is the longitudinal upper Cretaceous System of application example of the present invention, Jurassic system, the Permian System are stacked three overlap series of strata oil reservoir well net deployment and conversion regime schematic diagrames.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The object of the embodiment of the present invention can be developed longitudinal oil reservoir with multiple series of strata simultaneously, avoid crossflow and interference, improve rate of oil production, increase water drive sweep efficiency, slow down rate of water cut increase, increase well pattern utilization ratio, realize the three-dimensional Efficient Development of longitudinal oil reservoir with multiple series of strata when drilling well number is identical.
As shown in Figure 3, be three series of strata oil reservoir well net deployment schematic diagrames of stacked growth in a kind of longitudinal direction of the embodiment of the present invention, wherein, (a) for well spacing is
anti-9 basic well patterns; (b) for well spacing be 2L inverted nine-spot pattern; C () is two cover well spacings is the superimposed inverted nine-spot pattern of 2L; D () is two cover well spacings to be 2L and a set of well spacing be
superimposed inverted nine-spot pattern; E () is two cover well spacings
with a set of well spacing be
superimposed five-spot pattern.In described longitudinal direction, two series of strata of stacked growth are followed successively by K, J and M series of strata from top to bottom, and optimal well-spacing is L, and in described longitudinal direction, three series of strata oil reservoir well patterns of stacked growth comprise:
With
well spacing dispose the basic well pattern of J series of strata, all finishing drilling is to M series of strata foot oil reservoir for the basic well pattern of all J series of strata, and metaideophone centerwell simultaneously, forming around a bite well water filling of center the square well spacing that 8 mouthfuls of wells recover the oil is
inverted nine-spot pattern;
After basic well pattern is improved in full oil field, the diagonal central point between adjacent two producing wells in diagonal angle bores infill well, and after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements first time diagonal angle encryption and form the inverted nine-spot pattern exploitation J series of strata that well spacing is 2L;
After first time diagonal angle encryption, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all infill wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, second time laterally encryption forms the square inverted nine-spot pattern exploitation K series of strata oil reservoir that another set of well spacing is 2L, and J series of strata and K series of strata two are overlapped the distance that to stagger between well pattern and are
Dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K series of strata and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
superimposed inverted nine-spot pattern;
K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well patterns: the producing well comprehensive water cut being assumed to be J series of strata and M series of strata rises to after 80% respectively, shutoff J series of strata and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration; When K, J and M tri-overlaps after Grouping of Sand Members And Well exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, K, J and M tri-overlaps Grouping of Sand Members And Well and again exchanges target zone between two, the water drive remaining oil of exploitation the other side series of strata; Through the well pattern thickening of three times, and be adjusted to five-spot pattern by inverted nine-spot pattern three times and three exploitation object series of strata are exchanged, finally make longitudinally upper K, J and M tri-overlap three series of strata oil reservoir well patterns that series of strata all reach stacked growth in longitudinal direction that optimal well-spacing is L.
Optionally, the described optimal well-spacing in three series of strata oil reservoir well patterns of stacked growth in described longitudinal direction is that L determines according to well spacing density.
Optionally, described well spacing density obtains according to following formula:
Wherein, N represents oil in place 10
4t; R
trepresent development period recoverable reserves recovery percent of reserves; P represents oil sale price, unit/t; E
drepresent oil displacement efficiency; B represents design Wells; S represents well spacing density, mouth/km
2; A represents oil area, km
2; M represents individual well gross investment, 10
4unit/mouth; I represents loan interest; T represents the investment payback time, a; C represents operating cost, 10
4unit/(mouth .a); L represents rational well spacing, m.
Optionally, after obtaining described well spacing density S, obtain described optimal well-spacing L according to following formula:
On the other hand, as shown in Figure 4, for three series of strata oil reservoir well net deployment method flow diagrams of stacked growth in a kind of longitudinal direction of the embodiment of the present invention, in described longitudinal direction, three series of strata of stacked growth are followed successively by K, J and M series of strata from top to bottom, optimal well-spacing is L, and in described longitudinal direction, three series of strata oil reservoir well net deployment methods of stacked growth comprise:
401, with
well spacing dispose the basic well pattern of J series of strata, all finishing drilling is to M series of strata foot oil reservoir for the basic well pattern of all J series of strata, and metaideophone centerwell simultaneously, forming around a bite well water filling of center the square well spacing that 8 mouthfuls of wells recover the oil is
inverted nine-spot pattern;
402, after basic well pattern is improved in full oil field, diagonal central point between adjacent two producing wells in diagonal angle bores infill well, after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements first time diagonal angle encryption and forms the inverted nine-spot pattern exploitation J series of strata that well spacing is 2L;
403, after first time diagonal angle encryption, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all infill wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, second time laterally encryption forms the square inverted nine-spot pattern exploitation K series of strata oil reservoir that another set of well spacing is 2L, and J series of strata and K series of strata two are overlapped the distance that to stagger between well pattern and are
404, dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K series of strata and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
superimposed inverted nine-spot pattern;
405, K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well patterns: the producing well comprehensive water cut being assumed to be J series of strata and M series of strata rises to after 80% respectively, shutoff J series of strata and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration; When K, J and M tri-overlaps after Grouping of Sand Members And Well exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, K, J and M tri-overlaps Grouping of Sand Members And Well and again exchanges target zone between two, the water drive remaining oil of exploitation the other side series of strata; Through the well pattern thickening of three times, and be adjusted to five-spot pattern by inverted nine-spot pattern three times and three exploitation object series of strata are exchanged, finally make longitudinally upper K, J and M tri-overlap three series of strata oil reservoir well patterns that series of strata all reach stacked growth in longitudinal direction that optimal well-spacing is L.
Optionally, three series of strata oil reservoir well net deployment methods of stacked growth in described longitudinal direction, also comprise:
Determine that described optimal well-spacing is L according to well spacing density.
Optionally, described well spacing density obtains according to following formula:
NR
TPE
DBe
-B/S＝[M(1+i)
T/2+TC]AS
2，
Wherein, N represents oil in place 10
4t; R
trepresent development period recoverable reserves recovery percent of reserves; P represents oil sale price, unit/t; E
drepresent oil displacement efficiency; B represents design Wells; S represents well spacing density, mouth/km
2; A represents oil area, km
2; M represents individual well gross investment, 10
4unit/mouth; I represents loan interest; T represents the investment payback time, a; C represents operating cost, 10
4unit/(mouth .a); L represents rational well spacing, m.
Optionally, after obtaining described well spacing density S, obtain described optimal well-spacing L according to following formula:
Embodiment of the present invention technique scheme has following beneficial effect: first determine the longitudinal straticulate exploration of oil reservoir and rational spacing between wells, according to well spacing and the middle transition Well Pattern And Spacing of longitudinal germinal layer coefficient determination basic well pattern.Longitudinal superimposed growth three is overlapped to the oil reservoir of series of strata, the well spacing of basic well pattern
through once encrypting middle transition Well Pattern And Spacing 2L, after superencipher, form two cover well spacings is the superimposed inverted nine-spot pattern of 2L, and after Tertiary infilling, form two cover well spacings be 2L and a set of well spacing is
superimposed inverted nine-spot pattern, through between two alternately after exploitation, often overlapping series of strata plane Well Pattern And Spacing is rational well spacing L, well spacing evolution process by
increase well spacing be 2L and
well pattern conversion pilot process, increases well spacing uniformity coefficient and to reserves control rate under identical bit speed; Well spacing is in well pattern alternately middle realization encryption, often overlap well pattern to realize, to the orderly development of longitudinal each series of strata, improving well pattern utilization rate, oil reservoir realizes evenly employing simultaneously, reduce the horizontal contradiction in oil reservoir development process, be conducive to increasing oil field cumulative oil production and improving recovery ratio.When do not implement to close adopt and well number does not increase realize longitudinal oil reservoir and employ simultaneously, avoid longitudinal series of strata multiple zone and close the interlayer interference of adopting generation.In addition, longitudinally how cover series of strata convert five-spot pattern to through the inverted nine-spot pattern under different well spacing repeatedly changes water drive oil direction, and relative conventional method changes a water drive oil direction, improves oil-water displacement efficiency, and slow down rate of water cut increase.
Below in conjunction with application example, the above embodiment of the present invention is described in detail:
Application example of the present invention is according to the formula of the former Russian scholar Xie Erkaqiaofu about the relation of recovery percent of reserves and well spacing density, and according to input and output principle, consider Reservoir Crude Oil viscosity, mean permeability, oil displacement efficiency, recovery ratio, drilling cost, surface construction investment, loan interest rate, crude oil price factor, set up the formula calculating reasonable well pattern density:
NR
TPE
DBe
-B/S＝[M(1+i)
T/2+TC]AS
2；
N-oil in place 10 in formula
4t;
R
t-development period recoverable reserves recovery percent of reserves;
P-oil sale price, unit/t;
E
d-oil displacement efficiency;
B-design Wells;
S-well spacing density, mouth/km
2;
A-oil area, km
2;
M-individual well gross investment, 10
4unit/mouth;
I--loan interest;
T-investment payback time, a;
C-operating cost, 10
4unit/(mouth .a);
L-reasonably well spacing, m.
Calculate the well spacing density and rational well spacing density that meet above formula, thus obtain optimal well-spacing L.
Describe in detail below in conjunction with Fig. 3 and work as oil reservoir well net deployment and the method for adjustment that series of strata (being followed successively by K and J series of strata from top to bottom) are overlapped in the longitudinal superimposed growth three of oil reservoir:
When the oil reservoir of series of strata (being followed successively by K, J and M series of strata from top to bottom) is overlapped in the longitudinal superimposed growth three of oil reservoir.First with
well spacing dispose the basic well pattern of J series of strata, all wells all finishing drilling to M series of strata foot oil reservoir (comprising following all infill wells), metaideophone centerwell simultaneously, the square inverted nine-spot pattern ((a) see in Fig. 3) that around a bite well water filling of formation center, 8 mouthfuls of wells recover the oil, after basic well pattern is improved in full oil field, diagonal central point between adjacent two producing wells in diagonal angle bores infill well, after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements once encryption and forms inverted nine-spot pattern exploitation J series of strata ((b) see in Fig. 3) that well spacing is 2L.After a diagonal angle infilling adjustment improves, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, secondary laterally encryption forms square inverted nine-spot pattern exploitation K series of strata oil reservoir ((c) see in Fig. 3) that another set of well spacing is 2L, and the distance that staggers between two cover well patterns is
dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, and target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
inverted nine-spot pattern ((d) see in Fig. 3).K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well pattern (being assumed to be J and M series of strata) producing well comprehensive water cut rise to respectively after 80%, shutoff J and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration.After three cover Grouping of Sand Members And Wells have exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, three cover Grouping of Sand Members And Wells exchange target zone again between two, the water drive remaining oil of exploitation the other side series of strata.Through the well pattern thickening of three times, five-spot pattern and the exchange of three exploitation object series of strata is adjusted to three times by inverted nine-spot pattern, in final longitudinal direction, K, J and M tri-overlaps series of strata and reaches the development effectiveness ((e) see in Fig. 3) that optimal well-spacing is L, avoid simultaneously longitudinal series of strata multiple zone close the interlayer interference of adopting generation and with well site be every jacket layer pastern administration development well overlapping investment and successively on return the shortcoming can not taken into account longitudinal multiple zone and employ simultaneously.
In Fig. 3, well pattern is square well pattern, and in same well pattern, between adjacent well, well spacing is all equal.It is a flooding unit that note in Fig. 3 centered by water injection well adopts square.Around a bite water injection well of center, the square of 8 mouthfuls of producing wells is anti-9 flooding units, and around a bite well of center, 4 mouthfuls of producing well squares are 5 flooding units.
Such as, oil reservoir longitudinally upper growth two overlap series of strata and be respectively Cretaceous System K, Jurassic system J and Permian System P.As shown in Figure 5, be application example of the present invention three cover series of strata oil reservoir well net deployment and the conversion regime schematic diagrames that longitudinally upper Cretaceous System, Jurassic system, the Permian System are stacked, wherein, (a) for well spacing be anti-9 basic well patterns of 352m; (b) for well spacing be 250m inverted nine-spot pattern; C () is two cover well spacings is the superimposed inverted nine-spot pattern of 250m; D () is two cover well spacings be 250m and a set of well spacing is the superimposed inverted nine-spot pattern of 176m; E () is two cover well spacings be 352m and a set of well spacing is the superimposed five-spot pattern of 176m.Reservoir Crude Oil viscosity 320mPa.s, oil reservoir mean permeability 947.8mD, utilizing rational well spacing density design formulas to calculate rational well spacing density S according to basic parameter (seeing the following form 1) is 68.966 wells/km
2, rational well spacing L is 125m.Basic well pattern well spacing is 352m, and once in the middle of encryption, Well Pattern And Spacing is 250m, and forming two cover well spacings after superencipher is anti-9 the superimposed well patterns of 250m, and after Tertiary infilling, formation two cover well spacings are 250m inverted nine-spot pattern and a set of well spacing is anti-9 the superimposed well patterns of 176m.Deployment and the method for adjustment of well pattern are shown in Fig. 5, and in (d) in Fig. 5 → (e) conversion, three cover well patterns are carried out three series of strata respectively and exchanged, and in longitudinal direction, each object series of strata finally all reach 125m well spacing development effectiveness.
The specific oil deposit parameter of table 1
The technique effect of application example of the present invention: conventional pattern infilling method is through being laterally once encrypted to optimal well-spacing after basic well pattern is improved, namely well spacing by 2L only through being once encrypted to L, encrypting stage is few, encrypting well spacing from the well spacing basic well pattern that is 2L is that the drilling well number that the infilled well pattern of L needs is many, encryption times is long, oil reservoir development is in uneven employing for a long time, causes the plane difference opposite sex of oil reservoir development to increase.And the invention has the advantages that and first determine the longitudinal straticulate exploration of oil reservoir and rational spacing between wells, according to well spacing and the middle transition Well Pattern And Spacing of longitudinal germinal layer coefficient determination basic well pattern.Longitudinal superimposed growth three is overlapped to the oil reservoir of series of strata, the well spacing of basic well pattern
through once encrypting middle transition Well Pattern And Spacing 2L, after superencipher, form two cover well spacings is the superimposed inverted nine-spot pattern of 2L, and after Tertiary infilling, form two cover well spacings be 2L and a set of well spacing is
superimposed inverted nine-spot pattern, through between two alternately after exploitation, often overlapping series of strata plane Well Pattern And Spacing is rational well spacing L, well spacing evolution process by
increase well spacing be 2L and
well pattern conversion pilot process, increases well spacing uniformity coefficient and to reserves control rate under identical bit speed; Well spacing is in well pattern alternately middle realization encryption, often overlap well pattern to realize, to the orderly development of longitudinal each series of strata, improving well pattern utilization rate, oil reservoir realizes evenly employing simultaneously, reduce the horizontal contradiction in oil reservoir development process, be conducive to increasing oil field cumulative oil production and improving recovery ratio.When do not implement to close adopt and well number does not increase realize longitudinal oil reservoir and employ simultaneously, avoid longitudinal series of strata multiple zone and close the interlayer interference of adopting generation.In addition, longitudinally how cover series of strata convert five-spot pattern to through the inverted nine-spot pattern under different well spacing repeatedly changes water drive oil direction, and relative conventional method changes a water drive oil direction, improves oil-water displacement efficiency, and slow down rate of water cut increase.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogical block) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the replaceability (interchangeability) of clear displaying hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have universally described their function.Such function is the designing requirement realizing depending on specific application and whole system by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, digital signal processor, special IC (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can be realized by the combination of calculation element, such as digital signal processor and microprocessor, multi-microprocessor, and a Digital Signal Processor Core combined by one or more microprocessor, or other similar configuration any realizes.
The software module that method described in the embodiment of the present invention or the step of algorithm directly can embed hardware, processor performs or the combination of both.Software module can be stored in the storage medium of other arbitrary form in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, with make processor can from storage medium reading information, and write information can be deposited to storage medium.Alternatively, storage medium can also be integrated in processor.Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in user terminal.
In one or more exemplary design, the above-mentioned functions described by the embodiment of the present invention can realize in any combination of hardware, software, firmware or this three.If realized in software, these functions can store on the medium with computer-readable, or are transmitted on the medium of computer-readable with one or more instruction or code form.Computer readable medium comprises computer storage medium and is convenient to make to allow computer program transfer to the telecommunication media in other place from a place.Storage medium can be that any general or special computer can the useable medium of access.Such as, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly may be used for carrying or store the medium that can be read the program code of form with instruction or data structure and other by general or special computer or general or special processor.In addition, any connection can be properly termed computer readable medium, such as, if software is by a coaxial cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or being also comprised in defined computer readable medium with wireless way for transmittings such as such as infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with magnetic duplication data, and video disc carries out optical reproduction data with laser usually.Above-mentioned combination also can be included in computer readable medium.
Above-described detailed description of the invention; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. three series of strata oil reservoir well patterns of stacked growth in longitudinal direction, it is characterized in that, in described longitudinal direction, three series of strata of stacked growth are followed successively by K, J and M series of strata from top to bottom, and optimal well-spacing is L, and in described longitudinal direction, three series of strata oil reservoir well patterns of stacked growth comprise:
With
well spacing dispose the basic well pattern of J series of strata, all finishing drilling is to M series of strata foot oil reservoir for the basic well pattern of all J series of strata, and metaideophone centerwell simultaneously, forming around a bite well water filling of center the square well spacing that 8 mouthfuls of wells recover the oil is
inverted nine-spot pattern;
After basic well pattern is improved in full oil field, the diagonal central point between adjacent two producing wells in diagonal angle bores infill well, and after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements first time diagonal angle encryption and form the inverted nine-spot pattern exploitation J series of strata that well spacing is 2L;
After first time diagonal angle encryption, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all infill wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, second time laterally encryption forms the square inverted nine-spot pattern exploitation K series of strata oil reservoir that another set of well spacing is 2L, and J series of strata and K series of strata two are overlapped the distance that to stagger between well pattern and are
Dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K series of strata and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
superimposed inverted nine-spot pattern;
K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well patterns: the producing well comprehensive water cut being assumed to be J series of strata and M series of strata rises to after 80% respectively, shutoff J series of strata and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration; When K, J and M tri-overlaps after Grouping of Sand Members And Well exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, K, J and M tri-overlaps Grouping of Sand Members And Well and again exchanges target zone between two, the water drive remaining oil of exploitation the other side series of strata; Through the well pattern thickening of three times, and be adjusted to five-spot pattern by inverted nine-spot pattern three times and three exploitation object series of strata are exchanged, finally make longitudinally upper K, J and M tri-overlap three series of strata oil reservoir well patterns that series of strata all reach stacked growth in longitudinal direction that optimal well-spacing is L.
2. three series of strata oil reservoir well patterns of longitudinally upper stacked growth as claimed in claim 1, it is characterized in that, the described optimal well-spacing in three series of strata oil reservoir well patterns of stacked growth in described longitudinal direction is that L determines according to well spacing density.
3. three series of strata oil reservoir well patterns of longitudinally upper stacked growth as claimed in claim 2, it is characterized in that, described well spacing density obtains according to following formula:
Wherein, N represents oil in place 10
4t; R
trepresent development period recoverable reserves recovery percent of reserves; P represents oil sale price, unit/t; E
drepresent oil displacement efficiency; B represents design Wells; S represents well spacing density, mouth/km
2; A represents oil area, km
2; M represents individual well gross investment, 10
4unit/mouth; I represents loan interest; T represents the investment payback time, a; C represents individual well year operating cost, 10
4unit/(mouth .a); L represents optimal well-spacing, m.
4. three series of strata oil reservoir well patterns of longitudinally upper stacked growth as claimed in claim 3, is characterized in that, after obtaining described well spacing density S, obtain described optimal well-spacing L according to following formula:
5. three series of strata oil reservoir well net deployment methods of stacked growth in a longitudinal direction, it is characterized in that, in described longitudinal direction, three series of strata of stacked growth are followed successively by K, J and M series of strata from top to bottom, and optimal well-spacing is L, and in described longitudinal direction, three series of strata oil reservoir well net deployment methods of stacked growth comprise:
With
well spacing dispose the basic well pattern of J series of strata, all finishing drilling is to M series of strata foot oil reservoir for the basic well pattern of all J series of strata, and metaideophone centerwell simultaneously, forming around a bite well water filling of center the square well spacing that 8 mouthfuls of wells recover the oil is
inverted nine-spot pattern;
After basic well pattern is improved in full oil field, the diagonal central point between adjacent two producing wells in diagonal angle bores infill well, and after diagonal angle has been encrypted, the whole metaideophone well of centerwell, implements first time diagonal angle encryption and form the inverted nine-spot pattern exploitation J series of strata that well spacing is 2L;
After first time diagonal angle encryption, in laterally line mid point brill infill well enforcement laterally encryption between adjacent two wells, all infill wells all finishing drilling to J series of strata foot oil reservoir, after laterally having encrypted, the well centerwell metaideophone well of new encryption, second time laterally encryption forms the square inverted nine-spot pattern exploitation K series of strata oil reservoir that another set of well spacing is 2L, and J series of strata and K series of strata two are overlapped the distance that to stagger between well pattern and are
Dispose after two cover well spacings are superimposed anti-9 the square well patterns of 2L completing longitudinally two cover K series of strata and J series of strata, diagonal angle adjacent well line mid point disposes infill well in the plane, target zone is M series of strata, after third time enforcement diagonal angle encryption, M series of strata square well pattern centerwell metaideophone well, forming well spacing is
superimposed inverted nine-spot pattern;
K, J and M tri-overlap series of strata utilize the independent well pattern of three covers develop respective object series of strata produce a period of time to any two cover well patterns: the producing well comprehensive water cut being assumed to be J series of strata and M series of strata rises to after 80% respectively, shutoff J series of strata and M series of strata two overlap the producing well of well pattern and the perforated interval of water injection well, the injection-production well originally developing J series of strata penetrates out the oil reservoir of M series of strata, the injection-production well originally developing M series of strata penetrates out J series of strata, exchanges the remaining oil that series of strata exploit the other side's series of strata; All rise to after 80% when K, J and M tri-overlaps series of strata producing well comprehensive water cut, K, J and K, M Grouping of Sand Members And Well exchange straticulate exploration; When K, J and M tri-overlaps after Grouping of Sand Members And Well exchanged between two, often overlap producing well comprehensive water cut all high to more than 80%, prepare to implement well pattern conversion, original anti-9 the square well patterns of each series of strata convert respective "five-spot" flood system to by increasing water injection well, form the object series of strata that the exploitation of three covers independent "five-spot" flood system is current separately; When moisture be again increased to 80% after, K, J and M tri-overlaps Grouping of Sand Members And Well and again exchanges target zone between two, the water drive remaining oil of exploitation the other side series of strata; Through the well pattern thickening of three times, and be adjusted to five-spot pattern by inverted nine-spot pattern three times and three exploitation object series of strata are exchanged, finally make longitudinally upper K, J and M tri-overlap three series of strata oil reservoir well patterns that series of strata all reach stacked growth in longitudinal direction that optimal well-spacing is L.
6. three series of strata oil reservoir well net deployment methods of longitudinally upper stacked growth as claimed in claim 5, it is characterized in that, three series of strata oil reservoir well net deployment methods of stacked growth in described longitudinal direction, also comprise:
Determine that described optimal well-spacing is L according to well spacing density.
7. three series of strata oil reservoir well net deployment methods of longitudinally upper stacked growth as claimed in claim 6, it is characterized in that, described well spacing density obtains according to following formula:
Wherein, N represents oil in place 10
4t; R
trepresent development period recoverable reserves recovery percent of reserves; P represents oil sale price, unit/t; E
drepresent oil displacement efficiency; B represents design Wells; S represents well spacing density, mouth/km
2; A represents oil area, km
2; M represents individual well gross investment, 10
4unit/mouth; I represents loan interest; T represents the investment payback time, a; C represents individual well year operating cost, 10
4unit/(mouth .a); L represents optimal well-spacing, m.
8. three series of strata oil reservoir well net deployment methods of longitudinally upper stacked growth as claimed in claim 7, is characterized in that, after obtaining described well spacing density S, obtain described optimal well-spacing L according to following formula:
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