CN106979001A - Thick-layer glutenite horizontal well solid seam net fracturing optimizing method - Google Patents
Thick-layer glutenite horizontal well solid seam net fracturing optimizing method Download PDFInfo
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- CN106979001A CN106979001A CN201710416419.9A CN201710416419A CN106979001A CN 106979001 A CN106979001 A CN 106979001A CN 201710416419 A CN201710416419 A CN 201710416419A CN 106979001 A CN106979001 A CN 106979001A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention discloses a kind of thick-layer glutenite horizontal well solid seam net fracturing optimizing method, belong to oil gas field hydraulic fracturing technical field.Horizontal well wellbore trajectory, fracture interval and hop count, plane pressure-break length etc. are optimized first, oil reservoir felt area is divided into upper strata target area, middle target area and lower floor target area according to horizontal well well spacing scope, pass through reasonably optimizing, according to well factory development mode, in a Platform deployment horizontal well group as much as possible, surface well factory is formed；Then longitudinal pressure-break length is optimized；Finally longitudinal seam height is optimized.Finally realize a set of series of strata, multilayer exploitation considers in plane and matched with interlayer fracture parameters between layer well, on longitudinal direction, sets up steric bulk crack, maximization reserves controlling extent.The method reduces floor space, land expropriation cost height is reduced, is easy to concentrate drilling well, pressure break management；Avoid varying level well mutually altered in pressing crack construction process it is logical, with good effect of increasing production.
Description
Technical field
The invention belongs to oil gas field hydraulic fracturing technical field, it is related to a kind of thick-layer glutenite horizontal well solid seam net pressure break
Optimization method.
Background technology
Low permeable glutenite rock oil reservoir can not often form effective on stream because permeability is low, porosity is small
Seepage channel, along with the water sensitivity of rock stratum Mineral Component, expansion blockage hole throat causes after clay mineral runs into water
Oil gas well production is reduced rapidly, it is impossible to meet the basic demand of economic development.For this problem, horizontal well multistage subsection pressure break
As one of current maximally effective well stimulation both at home and abroad, stitched by man, multistage fracturing is carried out along horizontal segment, formation has
The seepage channel and seam net system of certain flow conductivity, oil-gas reservoir effective communication is got up, the purpose effectively increased production is reached.Through pressure
After splitting, oil gas well production is substantially increased, and remarkable in economical benefits is improved, and many immovable use or is difficult to the low permeable glutenite rock employed
Oil reservoir breaches technology restriction, has shone vigor, and strong support is provided for national energy demand.
Current horizontal well multistage subsection Optimal Fracturing Techniques of Ul using individual well fracturing optimizing as main developing direction, primarily directed to
Single horizontal well arranges wellbore trace according to crustal stress orientation and size, and geology dessert and engineering sweet tea are calculated with reference to geology, oil reservoir
Point, reasonably optimizing is individual well horizontal segment pressure break hop count of the design with optimal production capacity, intersegmental away from, cluster spacing and every section of seam length, confirms
Every section of pressure break scale, optimum economic benefit is obtained while optimal production capacity is obtained.But when glutenite thickness is larger, opening
There is either extension horizontal section length increase pressure break hop count during hair, or increase pressure break scale extension supporting crack length
It all can not effectively control the situation of oil-gas reservoir reserves, individual well employs that oil-gas reservoir reserves are low, it is small to involve scope, individual well limit seepage flow half
Footpath is far from involving oil-gas reservoir up-and-down boundary, and reserves exploitation degree is low, it is difficult to realize that longitudinal thickness is effectively employed.In this feelings
The horizontal well well spacing prioritization scheme one used under condition be horizontal well polydispersion in multiple platforms, floor space is big, fees paid for taking rural land
It is apart from each other between platform and platform with height, it is not easy to concentrate drilling well, pressure break management；Two be varying level well in pressing crack construction
During mutually alter logical, the seam net form state formed is not inconsistent with former optimization design, reduces effect of increasing production.
The content of the invention
The purpose of the present invention is that there is provided a kind of thick-layer gravel for the glutenite thickness defect that prior art is present when larger
Rock horizontal well solid seam net fracturing optimizing method.The purpose of the present invention is achieved through the following technical solutions.
The problem of for presently, there are, using three-dimensional seam net pressure break during the larger glutenite horizontal well development of thickness
Optimisation technique：First, as shown in figure 1, being carried out to horizontal well wellbore trajectory, fracture interval and hop count, plane pressure-break length etc. excellent
Change, oil reservoir felt area is divided into upper strata target area, middle target area and lower floor target area according to horizontal well well spacing scope, by rationally excellent
Change, according to well factory development mode, in a Platform deployment horizontal well group as much as possible, form surface well factory；Then, such as
Shown in Fig. 2, longitudinal pressure-break length is optimized；Finally, as shown in figure 3, being optimized to longitudinal seam height.Finally realize a set of
Series of strata, multilayer exploitation, consider in plane and to be matched with interlayer fracture parameters between layer well, on longitudinal direction, set up steric bulk crack,
Maximize reserves controlling extent.Concrete technical scheme is as follows：
A kind of thick-layer glutenite horizontal well solid seam net fracturing optimizing method, it is characterised in that including following optimization content：
(1) horizontal well well bore track optimizing：For formed double-vane raphe transection, horizontal well should follow horizontal well horizontal segment well bore with
The parallel principle in minimum principal stress direction, but to reduce expropriation of land land used, while formed raphe transection form is considered, by level
Well is deployed on ground in a common surface well factory platform, and horizontal segment and most flood are kept during subterranean well
Flat principal direction of stress angle control is between 65 °~90 ° (as shown in the crack angle in Fig. 1).
It is logical to avoid the upper fracturing fracture seam height in longitudinal direction from mutually altering, by net horizontal section during each layer wellbore trajectory design on longitudinal direction
Plane projection is staggered, and fracturing fracture is extended along in the middle of two wells, forms the offset well fracture interval of certain distance, adjacent level well it
Between crack mutually stagger certain position.
(2) fracture interval and hop count optimization：Using non-darcy percolation as guidance, oil reservoir limit seepage flow radius is calculated,
Expand as far as possible makes the seepage flow between each crack be independent of each other while involving scope, expands volume increase volume, carries out AOF calculation
Optimize and revise and confirm rationally with well fracture interval and pressure break hop count.
(3) plane pressure-break length optimizes：Oil reservoir felt area is divided into upper strata target area, middle target area and lower floor target area, together
Layer horizontal well is main to be grown according to physical property, well spacing optimization double-vane seam, and due to using radial well pattern, in upper strata target area, well pattern is close
Degree is big, and inter-well distance is small, and for the pressure break position of horizontal well, double-vane should be suitably increased if offset well does not bore chance effective reservoir
Seam is long and improves pressure break scale, if offset well is bored in the position meets effective reservoir, double-vane should be controlled to stitch length, it is to avoid mutually alter
Logical, interference；Middle target area oil reservoir, well pattern are relatively uniform, are designed using staggeredly fracturing fracture, control double-vane seam length, reduction
Alter ventilation danger in crack；The radial diverging of lower floor's target area horizontal well, horizontal segment is different in size so that regional area reserves control journey
Degree is poor, and for single oil well Zuan Yu areas, increase double-vane seam length improves reserves control.
(4) longitudinal pressure-break length optimization：Such as Fig. 2, mutual two mouthfuls of adjacent water horizontal wells are needed to its pressure break position in the vertical
Single slot length optimize, by a crack seam end A spot projections to another crack stitch end B points, A, B, C connect set up right angle
Triangle, calculates the length of the hypotenuse, the single seam limit radius for making end points spacing AC be equal to twice, the reserves between two wells is obtained maximum
Change control and utilize.
(5) longitudinal seam height optimization：Thick-layer glutenite use a set of series of strata, multilayer development approach, such as Fig. 3 to longitudinal offset well it
Between the high spacing of longitudinal seam carry out fracture height extended simulation optimization according to rock mechanics result of calculation, it is ensured that seam is up to maximum
While involving scope, longitudinal direction is upper logical without altering each other, and optimal operational discharge capacity and sand feeding amount are determined according to simulative optimization result,
Add the haydite type involved by sand according to formation fracture spread scenarios optimum organization in some circumstances, improve or reduction seam is interior
Net pressure, control critical eigenvalue is turned to.
A kind of thick-layer glutenite horizontal well solid seam net fracturing optimizing method that the present invention is provided, reduces floor space,
Land expropriation cost is reduced, is easy to concentrate drilling well, pressure break management；Varying level well is avoided mutually to alter in pressing crack construction process
It is logical, with good effect of increasing production.
Brief description of the drawings
Fig. 1 is wellbore trajectory, fracture interval and the hop count of the present invention, plane pressure-break length optimization schematic diagram.
Fig. 2 is longitudinal pressure-break length optimization schematic diagram of the present invention.
Fig. 3 is the longitudinal seam height optimization schematic diagram of the present invention.
Reference：1- surface wells factory, 2- upper stratas target area, 3- middle areas 3,4- lower floors target area, 5- oil reservoir felt areas, 6-
Ground well head, 7- horizontal well horizontal segments, 8- double-vanes crack, 9- cracks angle, 10- double-vanes seam length, 11- is with well fracture interval, 12-
Offset well fracture interval, 13- single-blades crack, 14- seam transverse plane projections, 15- vertical depths, the high spacing of 16- longitudinal seams.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
The present invention has carried out exploitation actual verification in certain thick-layer glutenite block：
For certain thick-layer sandy conglomerate bodies, need to arrange 3 raised platforms around a well when horizontal wellbore and maximum principal stress angle are 90 °,
By horizontal well well bore optimization design, horizontal well group horizontal segment is more than 75 ° with maximum principal stress angle can form a surface well
Factory 1, radial well pattern, concentrate drilling well, concentrate pressure break, compared to taking up an area few 30%~40%, and control reserve increase by 25%~
35% or so.
The oil reservoir block effective flowing radius is calculated for 34m using non-darcy percolation, and ultimate drainage radius is 61m,
Reasonable spacing is typically chosen at 80~100m with reference to reservoir characteristic as optimal spacing in 68~121m between determining Horizontal Well,
Production capacity optimization determines that horizontal well horizontal segment 7 grows 900~1400m.
It is main according to physical property, well spacing optimization double-vane seam long 10 with layer horizontal well, confirm upper strata target area 2, middle target area 3, under
Layer target area 4 minimum well spacing, if offset well does not bore chance sand body, appropriate long 10 length of increase double-vane seam, to improve two wells
Reserves are controlled, if two wells bore chance sand body, long 10 length of control double-vane seam, it is to avoid mutually alter logical, interference, use in the position
Staggeredly fracturing fracture is designed, control seam length, and ventilation danger is altered in reduction crack.
Optimized in the vertical using longitudinal pressure-break length and stitch high optimisation technique, optimization A target areas 2 support single-blade crack 13 to grow
Degree exists in 60~230m, the length of the support single-blade crack of middle area 3 13 in 75~150m, the length of the support single-blade crack of B target areas 4 13
110~218m, the high spacing 16 of longitudinal seam needs to control to link up with the crack of interlayer above and below avoiding within 80m.
By arranging 8 mouthfuls of water horizontal wells in identical platform, a set of series of strata, the mentality of designing of Three layer development are formed, 4 are completed
8 mouthfuls of well group, 87 sections of well concentrates the average construction period of pressure break to shorten 50% than single fractured horizontal well, and individual well operation expense effectively drops
Low, the average oil-producing of individual well reaches more than 4 times of same block straight well after pressure break, achieves good correctional effect.
Claims (3)
1. a kind of thick-layer glutenite horizontal well solid seam net fracturing optimizing method, it is characterised in that including following optimization content：
(1) horizontal well well bore track optimizing：Oil reservoir felt area is divided into upper strata target area, middle target area and lower floor target area, by water
Horizontal well is deployed on ground in a common surface well factory platform, and horizontal segment and maximum are kept during subterranean well
Horizontal principal stress angular separation is controlled between 65 °~90 °；By the plane of net horizontal section during each layer wellbore trajectory design on longitudinal direction
Projection is staggered, and fracturing fracture is extended along in the middle of two wells, is formed between the offset well fracture interval of certain distance, adjacent level well
Crack is mutually staggered certain position；
(2) fracture interval and hop count optimization：Using non-darcy percolation as guidance, oil reservoir limit seepage flow radius is calculated, is produced
Energy calculation optimization is with well fracture interval and pressure break hop count；
(3) plane pressure-break length optimizes：Grown with layer horizontal well according to physical property, well spacing optimization double-vane seam；Upper strata target area horizontal well
Pressure break position, suitably increase double-vane seam is long and improves pressure break scale if offset well does not bore chance effective reservoir, if offset well is at this
Bore chance effective reservoir and then control double-vane to stitch length in position；Middle target area is designed with staggeredly fracturing fracture, and control double-vane seam is long
Degree；Lower floor's target area horizontal well pair is in single oil well Zuan Yu areas, increase double-vane seam length；
(4) longitudinal pressure-break length optimization：The mutual single slot progress of adjacent two mouthfuls of its pressure break positions of horizontal well pair in the vertical
Row optimization, stitches end A spot projections to another crack seam end B points, A, B, C connection are set up right angled triangle, calculated by a crack
The length of the hypotenuse, the single seam limit radius for making end points spacing AC be equal to twice；
(5) longitudinal seam height optimization：Crack is carried out according to rock mechanics result of calculation to the high spacing of longitudinal seam between longitudinal offset well
Height extended simulation optimizes, it is ensured that while seam up to involves scope to maximum, and longitudinal direction is upper logical without altering each other.
2. according to the method described in claim 1, it is characterised in that determined according to longitudinal crack altitude simulation optimum results optimal
Operational discharge capacity and sand feeding amount.
3. method according to claim 2, it is characterised in that according to involved by formation fracture spread scenarios optimum organization adds sand
And haydite type, improve or reduction seam in net pressure, control critical eigenvalue turn to.
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Cited By (9)
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| CN111396021A (en) * | 2020-03-04 | 2020-07-10 | 中国石油天然气股份有限公司 | Well arrangement optimization method for newly drilled and encrypted well in old oil field developed by water injection |
| CN111827965A (en) * | 2019-04-10 | 2020-10-27 | 中国石油化工股份有限公司 | Method for verifying shale gas engineering dessert |
| CN111980658A (en) * | 2020-09-02 | 2020-11-24 | 中国石油天然气股份有限公司 | Drilling method and drilling system |
| CN112084613A (en) * | 2019-06-13 | 2020-12-15 | 中国石油天然气股份有限公司 | Horizontal well optimized well spacing method and device |
| CN113009578A (en) * | 2019-12-19 | 2021-06-22 | 新奥科技发展有限公司 | Well bore track acquisition method of production well and communication method of production well |
| CN113530499A (en) * | 2020-04-21 | 2021-10-22 | 中国石油天然气股份有限公司 | Perforating method and perforating device for shale oil-gas horizontal well with small well spacing |
| CN113818859A (en) * | 2020-06-19 | 2021-12-21 | 中国石油化工股份有限公司 | Limit well spacing determination method, limit well spacing determination method and limit well spacing determination device for low-permeability oil reservoir |
| CN114527004A (en) * | 2022-02-23 | 2022-05-24 | 华美孚泰油气增产技术服务有限责任公司 | Visual experiment method for dynamic expansion of internal cracks of real reduction rock core |
| CN114575819A (en) * | 2022-03-08 | 2022-06-03 | 中国石油大学(北京) | Visual simulation method and device for migration of fracturing propping agent of true triaxial three-dimensional well pattern |
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Cited By (10)
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| CN111827965A (en) * | 2019-04-10 | 2020-10-27 | 中国石油化工股份有限公司 | Method for verifying shale gas engineering dessert |
| CN111827965B (en) * | 2019-04-10 | 2021-03-30 | 中国石油化工股份有限公司 | Method for verifying shale gas engineering dessert |
| CN112084613A (en) * | 2019-06-13 | 2020-12-15 | 中国石油天然气股份有限公司 | Horizontal well optimized well spacing method and device |
| CN113009578A (en) * | 2019-12-19 | 2021-06-22 | 新奥科技发展有限公司 | Well bore track acquisition method of production well and communication method of production well |
| CN111396021A (en) * | 2020-03-04 | 2020-07-10 | 中国石油天然气股份有限公司 | Well arrangement optimization method for newly drilled and encrypted well in old oil field developed by water injection |
| CN113530499A (en) * | 2020-04-21 | 2021-10-22 | 中国石油天然气股份有限公司 | Perforating method and perforating device for shale oil-gas horizontal well with small well spacing |
| CN113818859A (en) * | 2020-06-19 | 2021-12-21 | 中国石油化工股份有限公司 | Limit well spacing determination method, limit well spacing determination method and limit well spacing determination device for low-permeability oil reservoir |
| CN111980658A (en) * | 2020-09-02 | 2020-11-24 | 中国石油天然气股份有限公司 | Drilling method and drilling system |
| CN114527004A (en) * | 2022-02-23 | 2022-05-24 | 华美孚泰油气增产技术服务有限责任公司 | Visual experiment method for dynamic expansion of internal cracks of real reduction rock core |
| CN114575819A (en) * | 2022-03-08 | 2022-06-03 | 中国石油大学(北京) | Visual simulation method and device for migration of fracturing propping agent of true triaxial three-dimensional well pattern |
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Application publication date: 20170725 |