CN205532555U - Well pattern structure - Google Patents

Abstract

The utility model belongs to the oil and gas exploitation field, in particular to can improve oil reservoir ultimate recovery's well pattern structure, this well pattern structure deploys in fractured reservoir, and fractured reservoir concentrates the development interval including a plurality of fractures that extend along the horizontal direction, and every fracture concentrates the development interval and all includes a plurality of fracture development areas, and wherein, the well pattern structure includes: a water injection well penetrating the at least one fracture-focused developmental interval; a plurality of vertical oil production wells uniformly distributed around the water injection well, each vertical oil production well penetrating through at least one crack development area; and the multiple horizontal oil production wells are arranged around the vertical oil production well. The utility model provides a well pattern structure has increased the range of the ripples of injected water, has improved the water drive reserves of fractured reservoir and has used the degree, has improved the ultimate recovery ratio of fractured reservoir, has improved the development effect of fractured reservoir.

Description

A kind of well pattern structure

Technical field

This utility model belongs to oil-gas mining field, more particularly to a kind of well improving fractured reservoir ultimate recoveryWeb frame.

Background technology

Fractured reservoir refers to that oil is assembled and the oil reservoir that formed in Fractured trap.The important feature of fractured reservoirIt is exactly that petroleum distribution is the most uneven, is positioned at the oil well output very different of same reservoir different parts.Cause this situationReason, with the hole of the reservoir of fractured reservoir-Causes of Cracking is complicated and skewness is relevant.Fractured oil gasThe original porosity height hiding reservoir differs, and permeability is the most extremely low, but the highest in the permeability of Fractured Zone, itsReservoir and flow space distribution pole heterogeneity, the different parts of same reservoir, storage and collection performance differs greatly.Developing thisDuring the oil reservoir of type, it is most important that analyze and recognize the Fractured Zone regularity of distribution, because the growth of slit band dividesCloth situation, controls the enrichment degree of oilbearing stratum.

Meanwhile, on stream, along with the exhaustion of natural energy, for fractured reservoir, want to obtain higherRecovery ratio, it is necessary to supplement stratum energy by modes such as water fillings, the success or failure of reservoir waterflooding are played by crack thereinVital effect.On the one hand crack can make injection water quickly advance by leaps and bounds producing well, makes water breakthrough, fromAnd make yield reduce.On the other hand the existence in crack increases the percolation ability on stratum.How to improve opening of this type of oil reservoirSend out effect, set up rational well-pattern system become it is nowadays accepted that a difficult problem.

Expert's fracture type reservoir well pattern has carried out numerous studies both at home and abroad.Within 2002, history becomes grace to pass through oil reservoir numberValue analogy method research finds: rhombic inverted nini-spot well pattern and rectangular pattern adaptability are relatively strong, and development index is best.2003Nian Zhouxi life, Mu Jiandong etc. by different well pattern forms and different injection mode are combined into multiple scheme and study,Find that the suitability of diamond shaped pattern fracture type reservoir is the strongest.2004 Nian Chen states profits, Liang Chunxiu et al. for crack andThe obvious oil reservoir of sand body directivity, is optimized important parameters such as well spacing density, well array direction, injection-to-producing well ratiosResearch.Research shows: rhombic inverted nini-spot well pattern is stronger for crack and the obvious oil reservoir fitness of sand body directivity.2006, LiLi, Bingyu Ji et al. by numerical reservoir simulation method compare 5 points, 4 points, anti-9: 4The well pattern development effectiveness to oil reservoir, result of study finds: the water drive control of five-spot pattern is higher than other well pattern form8-10%, moisture content and recovery percent of reserves are higher than other well pattern form.King ten thousand in 2009 is refined, Guo Xiao et al. analyzes wellRow with fractuer direction at 45 °, 22.5 °, 0 ° time inverted nine-spot injection pattern development effectiveness, draw fracture development journeySpend the conclusion that different most suitable well pattern is the most different.

Theoretical research and mining site practice all show, whether well net deployment mates with extension direction, crack, and greatly impact is openedSend out effect.But in the research of current well pattern structure, about well pattern and reservoir heterogeneity, particularly with splitThe matching relationship of seam distribution, and the aspect research such as permeability anisotropy is weaker.

In the development process of fractured reservoir, often occur that directivity water breakthrough is fast, water logging is fast and reserves exploitation is unbalancedEtc. problem；And at fractured reservoir in development late stage, there is also injection water retaining in reservoir and decline, add up water-oil factor rising and consumptionThe problem that the water yield rises., also find in Development Practice meanwhile, utilize merely Vertical Christmas well development fractured reservoir,The water breakthrough of injected water cannot be suppressed, it is difficult to be effectively improved flood effectiveness.

Therefore, it is badly in need of setting up a kind of suitably well pattern structure, gives full play to the crack advantage to volume increase, improve furtherThe development effectiveness of fractured reservoir.

Utility model content

The purpose of this utility model is to provide a kind of fractured reservoir well pattern structure, it is possible to increase reservoir water drive reserves exploitationDegree, improves the ultimate recovery of oil reservoir.

For reaching above-mentioned purpose, the utility model proposes a kind of well pattern structure, be deployed in fractured reservoir, described crackProperty oil reservoir include multiple horizontally extending crack and concentrate and grow interval, each described crack is concentrated and is grown intervalAll including multiple fracture developing zone, wherein, described well pattern structure includes:

Water injection well, concentrates through crack at least one described and grows interval；

Many mouthfuls of Vertical Christmas wells, are distributed on around described water injection well, and every mouthful of described Vertical Christmas well is through at least one instituteState fracture developing zone；

The many mouthfuls of flat producing wells of horizontal saliva, are arranged in around described Vertical Christmas well.

Well pattern structure as above, wherein, described water injection well is concentrated through plural described crack and is grown interval,Being additionally provided with more than one packer in described water injection well, described packer is arranged on the described crack that each two is adjacentConcentrate and grow between interval, described water injection well is insulated into plural water filling interval, in each described water filling intervalAll packings have a described crack to concentrate growth interval.

Well pattern structure as above, wherein, the aboveground oil recovery hole that is provided with of described Vertical Christmas, place, described oil recovery holeThe fracture developing zone that described fracture developing zone passes with described water injection well is isolated.

Well pattern structure as above, wherein, described Vertical Christmas well is more than described in 3m at least across a thicknessFracture developing zone；Horizontally disposed in this thickness fracture developing zone more than 3m have two mouthfuls of described horizontal productionWell.

Well pattern structure as above, wherein, the thickness at described fracture developing zone is more than under 15m state, at thisTwo mouthfuls of described horizontal production wells from top to bottom it are provided with in fracture developing zone.

Well pattern structure as above, wherein, described well pattern structure includes the water injection well of more than two mouthfuls, described water injection wellAlong the principal direction linear arrangement of described fractured reservoir, and germinal layer concentrated by described water injection well through all of described crackSection.

Well pattern structure as above, wherein, is disposed with four mouthfuls of described Vertical Christmas wells around water injection well described in every a bite,And described four mouthfuls of Vertical Christmas wells are separately positioned on foursquare four end points centered by this water injection well.

Well pattern structure as above, wherein, the well array of described Vertical Christmas well formation and the master of described fractured reservoirAngle between direction is 45 degree.

Well pattern structure as above, wherein, the horizontal segment of described horizontal production well and the main formula of described fractured reservoirTo having 45 degree of angles.

Well pattern structure as above, wherein, the horizontal section length of described horizontal production well is 300m to 500m.

Well pattern structure as above, wherein, the well spacing between described water injection well and described Vertical Christmas well is 300mTo 400m, the well spacing between the horizontal segment of described water injection well and described horizontal production well is 170m to 280m, phaseDescribed in adjacent two, the well spacing between Vertical Christmas well is 400m to 500m.

Compared with prior art, this utility model has the characteristics that and advantage:

The well pattern structure that the utility model proposes has taken into full account the anisotropism of well pattern structure and fractured reservoir reservoir,Particularly with the matching relationship of fractue spacing, water injection well and producing well connection and reasonable arrangement, not only increase and inject involving of waterScope, substantially increases the water drive reserves development degree of fractured reservoir, also has preferably simultaneously for remaining oil between wellDisplacement effect, finally improves the ultimate recovery of fractured reservoir, improves the development effectiveness of fractured reservoir.ThisThe well pattern structure that utility model proposes is particularly suited for special Fracture with low permeability oil reservoir, to high efficient rational development oil field, improvesThe ultimate recovery of oil reservoir is significant.

Accompanying drawing explanation

Accompanying drawing described here is only used for task of explanation, and is not intended to limit disclosed in this utility model by any wayScope.It addition, the shape of each parts in figure and proportional sizes etc. are only schematically, it is adapted to assist in this practicality newlyThe understanding of type, is not shape and the proportional sizes specifically limiting each parts of this utility model.Those skilled in the artUnder teaching of the present utility model, various possible shape and proportional sizes can be selected as the case may be to implement thisUtility model.

Fig. 1 is the planar configuration relation schematic diagram of this utility model well pattern structure；

Fig. 2 is section and the longitudinal divisions schematic diagram of well pattern structure of the present utility model；

Fig. 3 is the schematic diagram of Vertical Christmas well perforating site in this utility model；

Fig. 4 is the horizontal segment optimization length schematic diagram under Dikken optimization principles of the present utility model；

Fig. 5 is different well spacing Technological Economy relation curve schematic diagram of the present utility model.

Description of reference numerals:

110-crack is concentrated and is grown interval；

111-crack is concentrated and is grown interval；112-crack is concentrated and is grown interval；113-crack is concentrated and is grown interval；

120-fracture developing zone；

200-water injection well；210-packer；

300-Vertical Christmas well；310-oil recovery hole；

400-horizontal production well.

Detailed description of the invention

In conjunction with accompanying drawing and the description of this utility model detailed description of the invention, it is possible to clearly understand of the present utility modelDetails.But, detailed description of the invention of the present utility model described here, it is only used for explaining the purpose of this utility model,And can not be understood as by any way is to restriction of the present utility model.Under teaching of the present utility model, technical staffIt is contemplated that based on the most possible deformation of the present utility model, these are regarded as belonging to model of the present utility modelEnclose.

In order to solve fractured reservoir exploitation, difficulty is big, cost of winning is high, development effectiveness is poor, reserves exploitation is unbalancedProblem, this utility model applicant relies on experience and the practice being engaged in relevant industries for many years, with laboratory test and macroscopic view ore depositField Production development analysis is integrated as starting point, sets up microcosmic and contacts with macroscopical, sets up a set of effective crackProperty oil reservoir skewed pattern structure, improve reservoir water drive reserves exploitation degree, and then finally gathering of oil reservoir can be improvedRate.

Refer to Fig. 1, Fig. 2, wherein, Fig. 1 is the planar configuration relation schematic diagram of this utility model well pattern structure；Fig. 2 is section and the longitudinal divisions schematic diagram of well pattern structure of the present utility model.As shown in Figure 1 and Figure 2, this practicalityThe well pattern structure of novel proposition, is deployed in fractured reservoir, and this fractured reservoir includes multiple horizontally extendingCrack concentrate grow interval 110, each crack concentrate grow interval all include multiple fracture developing zone 120, crackGrow interval division, awareness based on fine geological study, have metastable interlayer each other, alsoIt is exactly to be split by crack aplasia section.As shown in Figure 1 and Figure 2, well pattern structure include water injection well 200, many mouthfuls verticalProducing well 300 and the many mouthfuls of flat producing wells of horizontal saliva 400, wherein, germinal layer concentrated by water injection well 200 through at least one crackSection 110；Many mouthfuls of Vertical Christmas wells 300, are distributed on around water injection well 200, and every mouthful of Vertical Christmas well 300 is through extremelyA few fracture developing zone 120；The many mouthfuls of flat producing wells of horizontal saliva 400, are arranged in Vertical Christmas well 300 around.

The well pattern structure that the utility model proposes, uses water injection well 200, Vertical Christmas well 300 and horizontal production well 400Combined form, and take into full account when arranging water injection well 200, Vertical Christmas well 300 and horizontal production well 400The anisotropism of fractured reservoir reservoir, particularly concentrates with crack and grows interval 110 and fracture developing zone 120Matching relationship, increase and inject involving scope and substantially increasing the water drive reserves of fractured reservoir and employ journey of waterDegree；The well pattern structure that simultaneously the utility model proposes also has preferable displacement effect for remaining oil between well, finally improvesThe ultimate recovery of fractured reservoir, improves the development effectiveness of fractured reservoir.

In one optional example of this utility model, well pattern structure also includes: water injection string, is arranged on water injection wellIn 200, flow string, it is arranged in Vertical Christmas well 300.Additionally, well pattern structure can also include: packer210, it is arranged on water injection string.As in figure 2 it is shown, germinal layer concentrated by water injection well 200 through plural crackSection 110, in water injection well, 200 are additionally provided with more than one packer 210, and packer 210 is arranged on water injection stringOn, and packer 210 is arranged on the adjacent crack of each two and concentrates and grow between interval 110, by water injection well 200Insulating into plural water filling interval 220, in each water filling interval 220, all packing has a crack to concentrate germinal layerSection 110.As in figure 2 it is shown, the crack being positioned at top layer and intermediate layer is concentrated grows interval 110 by injecting water addedlyLayer energy, the fracture development interval 110 being positioned at bottom supplements stratum energy by bottom water.Wherein, packer can be adoptedUse existing hydro-mechanical set packer.

In an optional example, as it is shown on figure 3, pass the position of fracture developing zone 120 at Vertical Christmas well 300The place of putting is provided with oil recovery hole 310, and oil recovery hole 310 is arranged on flow string, connection flow string and fracture developing zone,And the fracture developing zone 120 that the fracture developing zone 120 at this place, oil recovery hole 310 and water injection well 200 are passed is separated byFrom, in other words, the fracture developing zone that fracture developing zone 120 and the water injection well 200 at this place, oil recovery hole 310 is passed120 be the oil recovery hole 310 of two separate fracture developing zone, i.e. Vertical Christmas well 300 with water injection well office notSame fracture developing zone 120.The water injected by water injection well 200 is made to arrive adopting of Vertical Christmas well 300 along crackThe time of oilhole increases, and expand injection water involves scope, improves the development effectiveness of fractured reservoir.Meanwhile,So can utilize bottom water energy more fully, and effectively extend the bottom water water logging time to Vertical Christmas well.Specifically, during as it is shown on figure 3, the oil recovery hole 310 of Vertical Christmas well 300 is positioned at crack concentration growth interval 112, hang downThe crude oil that straight 300 wells that recover the oil are grown in interval 112 for exploiting crack to concentrate, and grow interval by concentrating in crackThe horizontal production well 400 that the position of 113 is arranged is exploited crack and is concentrated the crude oil growing interval 113；Vertical Christmas wellWhen the oil recovery hole 310 of 300 is positioned at crack concentration growth interval 111, utilizes and inject water energy, pass through Vertical ChristmasWell 300 and horizontal production well 400 are jointly exploited crack and are concentrated growth interval 111 and crack concentration to grow in interval 112Crude oil.

In one optional example of this utility model, as shown in Figure 1 and Figure 2, Vertical Christmas well 300 at least acrossOne thickness is more than the fracture developing zone 120 of 3m；Along level in this thickness fracture developing zone 120 more than 3mDirection is provided with two mouthfuls of flat producing wells of horizontal saliva 400.As in figure 2 it is shown, two mouthfuls of flat producing wells of horizontal saliva 400 are arranged in Vertical ChristmasThe both sides of well 300.

In an optional example, the thickness at fracture developing zone 120 is more than under 15m state, sends out in this crackTwo mouthfuls of flat producing wells of horizontal saliva 400 from top to bottom it are provided with in educating district 120.

In one optional example of this utility model, as in figure 2 it is shown, well pattern structure includes the water injection well of more than two mouthfuls200, water injection well 200 is along the principal direction linear arrangement of fractured reservoir, and water injection well 200 is through all of crack collectionMiddle growth interval 110.

In one optional example of this utility model, as in figure 2 it is shown, be disposed with four around every a bite water injection well 200Mouthful Vertical Christmas well 300, and these four mouthfuls of Vertical Christmas wells 300 are separately positioned on centered by this water injection well 200On foursquare four end points.That is, inverted five spot shown the most greatly by water injection well 200 and four mouthfuls of Vertical Christmas wells 300Method is distributed.Certainly, those skilled in the art can also adjust water injection well 200 with specific reference to actual reservoir geology situationIt is adjusted with the distribution mode of Vertical Christmas well 300.

In an optional example, between well array and the principal direction of fractured reservoir that Vertical Christmas well 300 is formedAngle is 45 degree.The principal direction of the fractured reservoir i.e. bearing of trend of fractured reservoir major fracture, oozes in the directionRate is maximum thoroughly, and perpendicular directional permeability is minimum.Results of numerical simulation shows along with Vertical Christmas well 300The well array of formation first increases reduce afterwards with the increase of fractuer direction angle, cumulative production and recovery percent of reserves, and aqueous taking the lead in subtractsIncrease after little.When the principal direction angle of the well array that Vertical Christmas well 300 is formed with fractured reservoir is 45 degree, tiredLong-pending oil production and recovery percent of reserves are maximum, and moisture content is minimum, and development effectiveness is best.

In an optional example, horizontal production well 400 horizontal segment starting end is big to the vertical dimension of water injection well 200In the vertical dimension of horizontal production well 400 horizontal segment end to water injection well, the horizontal segment of horizontal production well 400 and crackProperty oil reservoir principal direction there are 45 degree of angles, macroscopic view ASP flooding test shows that 45 degree of angles can effectively prevent water breakthrough, exploitationEffect is preferable.

In one optional example of this utility model, the horizontal section length of horizontal production well 400 be 300m extremely500m.Horizontal production well 400 can become the linear coning of bottom water and enter into banding step torr, thus extends bottom water waterFlood the time of oil well, expand swept volume, improve oil recovery factor.

Wherein, calculate based on horizontal well production exponential formula and Dikken optimization principles determines that horizontal production well 400 isExcellent horizontal section length, such as accompanying drawing 4, computing formula is:

In formula:

J_h--horizontal well, straight well productivity index, m3/ (d MPa m)；

J_v--horizontal well, straight well drainage radius, m；

R_ev--straight well drainage radius, m；

R_wh--horizontal well wellbore radius, m；

R_wv--straight well wellbore radius, m；

L--horizontal section length, m；

H--effective thickness, m；

S_v、S_h--effective thickness, straight well, horizontal well skin factor, zero dimension；

β--Zero dimension；

K_h、K_v--horizontal direction, vertical permeability, μm²。

Q_o=Q (0)-Q (L) is 2.

In formula:

Q_o--consider the horizontal well production of abrasion, m3/d；

Q (L)--horizontal segment end pit shaft flow；

Q (x)--pit shaft flow at the x of horizontal segment optional position, m3/d.

Q_o`=J_rLΔP ③

In formula:

Q_oHorizontal well production under the certain oil reservoir of `--, fluid condition, m3/d；

J_r--unit length horizontal well production index, m3/ (d MPa m)；

L--horizontal section length, m；

Δ P--horizontal well producing pressure differential, MPa.

Q_o/Q_o`=0.8 is 4.

By above-mentioned model iterative, it is to work as friction loss according to Dikken optimization principles definition optimum horizontal interval lengthReducing length during 20% production capacity, it is relatively reasonable that comprehensive study thinks that horizontal production well horizontal section length is set to 500m.

In one optional example of this utility model, the well spacing between water injection well 200 and Vertical Christmas well 300 is300m to 400m, the well spacing between the horizontal segment of water injection well 200 and horizontal production well 400 is 170m to 280m,The adjacent well spacing between two Vertical Christmas wells 300 is 400m to 500m.

Concrete, according to study area reservoir physical parameter, use single well-controlled recoverable reserves method, determine that this oil reservoir is reasonableWell spacing, computing formula is:

$N_{RO}=\frac{m_1+T\·A}{B\·E_R\left(T\right)}(1+\mathrm{\β})$

In formula:

N_RO--the average reasonable recoverable reserves of single well-controlled, 104t/ mouth；

m₁--individual well gross investment, 104 yuan/mouthful；

T--main development period, year；

A--individual well average year producing cost, 104 yuan/(mouth. year)；

B--crude oil price, unit/t；

E_R(T)--the recovery ratio of recoverable reserves, % in T；

β--oil field base earnings ratio, 0.12.

Above formula is utilized to calculate the single well-controlled recoverable reserves under different oil price and the relation under different recovery ratio, such as Fig. 5Shown in, for different oil prices and single well-controlled recoverable reserves, and recovery ratio, determine economic limit rational spacing between wells flexibly,When between two the most adjacent Vertical Christmas wells 300, well spacing is 400m to 500m, effect is best, Ji NengbaoDemonstrate,prove preferable exploitation effect, preferable economic benefit can be obtained again.

Relation statistical table under table 1 single well-controlled recoverable reserves and different recovery ratio

What the well pattern structure that layout the utility model proposes was used specifically comprises the following steps that

Step 1: according to study area FRACTURE CHARACTERISTICS, attribute volume is chased after by the parameters followed the trail of by arranging Formica fuscaTrack, and then produce Formica fusca attribute volume.Utilize the crack MBM of Petrel, on the basis of inputting parameter, in three-dimensionalSpecific region in grid, being determined by property sets up crack discrete networks model, and then fracture development belt scopePosition.

Step 2: for Fractured Zone scope in step 1, introduces compressional wave orientation amplitude information, thus obtains in many waysPosition Formica fusca amplitude body, utilizes in the range of Fractured Zone and carries out quantification based on amplitude with Orientation differences information fracture and retouchState, particularly as follows: utilize P-wave amplitude with azimuthal variation feature, calculated in many ways by R ü ger formula and simplified style thereofAzimuth data, follows the trail of result by the Formica fusca of the angles of azimuth data calculated and merges, more complete to realize fracture spreadThe description in face.

Wherein, R ü ger formula and simplified style thereof are most important theories based on amplitude anisotropy crack identification bases, itsApproximate formula is:

R (i, φ)=A+B^isosin²i+B^ani sin²icos²(φ-φ^sym) ①

In formula:

R (i, φ)--for the longitudinal wave reflection coefficient relevant with angle of incidence and azimuth；

G--is tangential modulus；

α--for velocity of longitudinal wave；

β--for shear wave velocity；

Δ--for the difference of upper and lower medium rock parameter；

δ^V、γ^V--for describing anisotropic Thomsen parameter；

φ^sym--for the azimuth of shot point to receiving station；

φ--for the azimuth of fracture strike；

I--is layered halfspace angle；

B^iso--for amplitude with the rate of change of geophone offset；

B^ani--for amplitude with azimuthal rate of change.

Step 3: set up fractured reservoir skewed pattern structure according to results of fracture prediction in step 2, as Fig. 1,Shown in Fig. 2, fractured reservoir includes the thickness more than one fracture developing zone 120 more than 3m, well pattern structure bagInclude two mouthfuls of water injection wells 200 (water injection well 200 can be vertical water injection well), six mouthfuls of Vertical Christmas wells 300 and three mouthfuls of waterFlat producing well 400.Grow direction and linearly arrange shape as it is shown in figure 1, two mouthfuls of vertical water injection wells 300 are positioned at major fracture and divideCloth, and it is in the center that fracture spacing is bigger as far as possible, six mouthfuls of Vertical Christmas wells 300 are distributed in water injection well 200Both sides, the most every four mouthfuls of Vertical Christmas wells 300 and a bite water injection well 200 show the most greatly the distribution of inverted five spot method,And the well array of Vertical Christmas well 300 and fractuer direction stagger certain angle, results of numerical simulation shows along with well arrayFirst increase with the increase of fractuer direction angle, cumulative oil production and recovery percent of reserves and reduce afterwards, increase after the aqueous reduction that takes the lead in.When the well array of Vertical Christmas well 300 is 45 ° with fractuer direction angle, cumulative oil production and recovery percent of reserves are maximum,Moisture content is minimum, and development effectiveness is best.

Step 4: for the fractured reservoir skewed pattern structure in step 3, according to actual reservoir development condition,Following the trail of result in conjunction with multi-faceted Formica fusca, arrange multiple packer 210 on water injection well 200, packer 210 can be adoptedUse hydro-mechanical set packer of the prior art.As long as water injection well 200 concentrates growth interval 110 just to exist through crackCrack concentrates growth interval 110 to be respectively arranged at two ends with a packer 210, and each crack concentrates growth interval 110 equalInsulated in a water filling interval of water injection well 200 by packer 210.

Step 5: for the fractured reservoir skewed pattern structure in step 3, arranges horizontal production well 400, itsIn as shown in Figure 1 and Figure 2, three mouthfuls of flat producing wells of horizontal saliva 400 are arranged in Vertical Christmas well 200 both sides, horizontal production well400 horizontal segment starting ends are more than horizontal production well 400 horizontal segment end to water injection well to the vertical dimension of water injection well 200The vertical dimension of 200, follows the trail of result horizontal production well 400 horizontal segment and major fracture bearing of trend in conjunction with multi-faceted Formica fuscaKeeping certain angle, macroscopic view ASP flooding test to show angle 45 °, can effectively prevent water breakthrough, exploitation effect is preferable.

Step 6: for the fractured reservoir skewed pattern structure in step 3, the aboveground perforating site of Vertical Christmas withWater injection well office difference fracture development section.

Step 7: for the fractured reservoir skewed pattern structure in step 3, horizontal production well horizontal section length is300m to 500m, horizontal production well can become the linear coning of bottom water and enter into banding step torr, thus extend bottom waterWater logging, to the time of oil well, expands swept volume, improves oil recovery factor.

Step 8: for the fractured reservoir skewed pattern structure in step 3, the geology characteristic in binding district,Consider technology and economic two factors, determine the rational spacing between wells of all kinds of well in study area.

Explaining in detail for the respective embodiments described above, its purpose is only that and explains this utility model, in order toBetter understood when this utility model, but, these describe can not be to this utility model with any explanation one-tenthRestriction, particularly, each feature described in various embodiments can also mutual combination in any, thus groupBecoming other embodiments, except there being the most contrary description, these features should be understood to be applied to any oneIn embodiment, and it is not limited merely to described embodiment.

Claims (11)

1. a well pattern structure, is deployed in fractured reservoir, described fractured reservoir include multiple in the horizontal directionThe crack extended is concentrated and is grown interval, and each described crack concentrates growth interval all to include multiple fracture developing zone, and it is specialLevying and be, described well pattern structure includes:

Water injection well, concentrates through crack at least one described and grows interval；

Many mouthfuls of Vertical Christmas wells, are distributed on around described water injection well, and every mouthful of described Vertical Christmas well is through at least one instituteState fracture developing zone；

The many mouthfuls of flat producing wells of horizontal saliva, are arranged in around described Vertical Christmas well.

2. well pattern structure as claimed in claim 1, it is characterised in that described water injection well passes plural instituteStating crack and concentrate growth interval, be additionally provided with more than one packer in described water injection well, described packer is arranged onThe described crack that each two is adjacent is concentrated and is grown between interval, and described water injection well insulates into plural water filling layerSection, in each described water filling interval, all packing has a described crack to concentrate growth interval.

3. well pattern structure as claimed in claim 2, it is characterised in that described Vertical Christmas is aboveground is provided with oil recovery hole,The fracture developing zone that the fracture developing zone at place, described oil recovery hole and described water injection well pass is isolated.

4. well pattern structure as claimed in claim 1, it is characterised in that described Vertical Christmas well is at least acrossThe thickness described fracture developing zone more than 3m；This thickness more than 3m fracture developing zone in horizontally disposedThere are two mouthfuls of described horizontal production wells.

5. well pattern structure as claimed in claim 4, it is characterised in that the thickness at described fracture developing zone is more thanUnder 15m state, in this fracture developing zone, from top to bottom it is provided with two mouthfuls of described horizontal production wells.

6. the well pattern structure as described in any one in claim 1 to 5, it is characterised in that described well pattern structureIncluding the described water injection well of more than two mouthfuls, described water injection well is along the principal direction linear arrangement of described fractured reservoir, and instituteState water injection well and concentrate growth interval through all of described crack.

7. well pattern structure as claimed in claim 6, it is characterised in that be disposed with around water injection well described in every a biteFour mouthfuls of described Vertical Christmas wells, and described four mouthfuls of Vertical Christmas wells are separately positioned on the square centered by this water injection wellFour end points on.

8. well pattern structure as claimed in claim 7, it is characterised in that the well array that described Vertical Christmas well is formed withAngle between the principal direction of described fractured reservoir is 45 degree.

9. well pattern structure as claimed in claim 7, it is characterised in that the horizontal segment of described horizontal production well and instituteThe principal direction stating fractured reservoir has 45 degree of angles.

10. well pattern structure as claimed in claim 1, it is characterised in that the horizontal section length of described horizontal production wellFor 300m to 500m.

11. well pattern structures as claimed in claim 1, it is characterised in that described water injection well and described Vertical Christmas wellBetween well spacing be 300m to 400m, the well spacing between the horizontal segment of described water injection well and described horizontal production well is170m to 280m, the well spacing between Vertical Christmas well described in adjacent two is 400m to 500m.