CN108071340B - A kind of well track design preferred method - Google Patents
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- CN108071340B CN108071340B CN201711318120.6A CN201711318120A CN108071340B CN 108071340 B CN108071340 B CN 108071340B CN 201711318120 A CN201711318120 A CN 201711318120A CN 108071340 B CN108071340 B CN 108071340B
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- 238000013461 design Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 43
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000005299 abrasion Methods 0.000 claims abstract description 16
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 244000264242 Descurainia sophia Species 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 241000776777 Cacopsylla mali Species 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
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- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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Abstract
The present invention provides a kind of well tracks to design preferred method, it is characterised in that: establishes well track design evaluatio model, Fn=a1·Cn‑a2·DDIn‑a3·SFn m·AFn；Wherein F: well track evaluation number；N: nth well track scheme code name；a1, a2, a3, weight coefficient；C: drilling well save the cost index；DDI: the orientation difficulty factor；SF: lateral force index of the tubing string in well；M: abrasion index of the lateral force to sucker rod；M is between 0.6~1.2；AFn: nth well track sucker rod anti-abrasion index；Well track optimum principle is the maximum well track scheme of F value.The present invention comprehensively considers drilling well, orients combined influence of the rod and tube partial-wear to input cost in difficulty of construction and production process, and the preferred wellbore Trajectory Design of multi-scheme Comprehensive Correlation achievees the purpose that reduce overall cost in life cycle, improves oil field development benefit.
Description
Technical field
The invention belongs to oil field drilling technical fields, more particularly, to overall cost in a kind of reduction producing well life cycle
Well track design preferred method.
Background technique
Well track is the Anomalistic space three-dimensional channel for being connected to ground well head and subsurface geology target point, drilling well, orientation
Well, well logging, well cementation and the involved tool and tubing string of later period production are all influenced by its shape, for identical well head and
Geology target spot theoretically can be designed that without several well tracks, but the well track of what shape is only optimal selection
? need to establish a kind of evaluation design method, Comprehensive Assessment optimizes well track design.
During wellbore construction, the smallest well track design scheme of drilling depth can reduce drilling depth cost, theoretically two o'clock
Between straight line it is most short, the design of this well track means to raising kickoff point (KOP) position as far as possible, and improving kickoff point (KOP) position will
Cause hold angle well section length to increase, increase the difficulty of hole cleaning and the frictional resistance of well drilling pipe column, torque, causes lower part drilling support
Pressure, the target for influencing construction efficiency, therefore optimizing in drilling process is to reduce borehole length under conditions of difficulty is moderate as far as possible, section
About drilling cost.It orients in well construction, selects suitable kickoff point (KOP) position, be conducive to orientation construction operation, shallow deflecting stratum is soft, well
Eye size is big, plays tiltedly difficulty, hole quality and is difficult to ensure, kickoff point (KOP) is too deep, and formation strength is big, and the deflecting construction time is long.Hold angle
Section hole angle is too small, and well track bearing swing, hole deviation is too big, and string friction is big, and pressurization is difficult, and TRAJECTORY CONTROL difficulty increases.
Therefore the target of orientation construction operation optimization is to facilitate to orient to construct and be conducive to TRAJECTORY CONTROL.In well logging construction, inclination section full-shape
Change rate is big, and hole deviation is big, and well logging is easy to cause to be hampered, therefore the target optimized in construction of logging well is then to reduce or eliminate electrical measurement
It is hampered.In cementing operation, hole deviation is big, hold angle segment length, is easy to cause setting of casing to be hampered, casing centralization is difficult, annular space narrow side replaces
Low efficiency, cementing quality are poor；Rate of over-all angle change is big, and casing strength reduces, and earlier set damage easily occurs.Therefore casing and cementing optimizes
Target is to guarantee the tripping in of the smooth safety of casing, is conducive to casing centralization, improves replacement efficiency, guarantees cementing quality.Later period production
In operation, the abrasion between sucker rod and oil pipe is mainly reduced, is reduced due to administering the increased cost of eccentric wear.Especially coal bed gas
In mining operation, rod and tube partial-wear has become the technical bottleneck problem for restricting coal bed gas extraction.
In conclusion current well track optimum design method, is all based on the technology solved in respective professional domain
Problem or the local cost of reduction optimize for target, and design method has limitation, and well track is once being formed, raw
The various operations produced in the entire life cycle of well are all affected by it, and influence will be permanent, therefore well track design is excellent
Choosing will comprehensively consider the index request that drilling well, orientation construction and later period production propose it, could reduce overall cost, improve effect
Benefit.
Summary of the invention
In view of this, the present invention is directed to propose a kind of well track design that can reduce cost in producing well life cycle is excellent
Choosing method comprehensively considers drilling engineering, orientation engineering and later period production operation cost, to reduce operation in producing well life cycle
Cost is optimization design target, optimizes well track, reaches reduction production well construction and O&M cost, improves the comprehensive effect of individual well
Benefit.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of well track design preferred method, establishes well track design evaluatio model, Fn=a1·Cn-a2·DDIn-
a3·SFn m·AFn；
Wherein F: well track evaluation number；N: nth well track scheme code name；a1, a2, a3, weight coefficient；C: it bores
Well save the cost index；DDI: the orientation difficulty factor；SF: lateral force index of the tubing string in well；M: lateral force is to sucker rod
Abrasion index；M is between 0.6~1.2；AFn: nth well track sucker rod anti-abrasion index；
Well track optimum principle is the maximum well track scheme of F value.
Prevent brushing up against geologic requirements according to mouth coordinate, target coordinate, well depth, offset well, using well track design software, if
Count a plurality of well track alternative for meeting drilling safety construction and geologic objective requirement.Then it optimizes in aforementioned manners
Selection.
Preferably, the calculation method of the drilling well save the cost index C calculates each wellbore according to drilling engineering service fee norm
Wellbore construction cost Cnc under the conditions of Trajectory Design scheme takes drilling cost highest one to be used as reference value Ccmax, calculates
Each well track drilling cost saving value Cncs, i.e. Cncs=Ccmax-Cnc；Then zero dimension processing, C are carried outn=Cncs/
10000 yuan；.
Preferably, the calculation method of the orientation difficulty factor D DI, calculates each well track scheme according to drag
Orient difficulty factor D DIn=log10((MDn·AHDn·TORTn)/TVDn)；
Wherein MDnWell depth is measured for nth well track scheme；AHDn: nth well track scheme horizontal displacement；
TORTn: nth well track scheme wellbore tortuosity, straight well section and steady tilted section are calculated by 0.5 °/30m；TVDn: nth wellbore
The vertical well depth of track scheme.
Preferably, the determination of weight coefficient, a1=1, a3=1；a2According to being differently directed degree-of-difficulty factor, caused by drilling well at
This difference determines；Two kinds of different well tracks of DDI are designed, the orientation index of difficulty difference DDI of two kinds of tracks is calculatedxWith due to
Cost difference C caused by DDI changesx, a2=Cx/(10000x DDIx)。
Preferably, the calculation method of lateral force index SF of the tubing string in well,
A. sucker rod axial load is calculated
Faxi=(Wri+W1)·[1+(S·N)2/1790]
Wherein WriIt is well depth h with the sum of aerial gravity of lower sucker rod, unit N；
W1For gravity of the fluid column on plunger annulus area, W1=(Ap-Ar)·L·g·ρ；L is the length of fluid column；G is
Gravity coefficient；ρ is fluid density.
ApFor ram area, m2；ArFor rod area of pumping, m2；
S is stroke, m；N is to rush number, min-1；
B. the calculating of lateral force SFn:
Wherein: WiTo calculate i-th section of aerial specific gravity of sucker rod, N/m；LiIt is long to calculate i-th section of sucker rod
Degree, m；Δ a is rate of azimuth change, °/m；It is averaged hole angle to calculate section, °；Δ θ is to calculate section rate of deviation, °/m.
Preferably, the calculating of well track sucker rod anti-abrasion Index A F, includes the following steps,
A. single abrasionproof cost determines: according to oil field same block or neighbouring similar block producing well Precautionary Measure investment at
This, statistics calculates the eccentric abrasion prevention cost of individual well single investment；
B. the eccentric wear damage period determines:
It is standard well that I, which establishes oil field same block or neighbouring similar block mouthful producing well, counts its sucker rod or oil pipe
Eccentric wear damages cycle T bz；
II, calculates lateral force SFbz at standard well eccentric wear；
III, calculates alternative well track scheme eccentric wear period Tn, Tn=Tbz (SFn/SFbz)m。
C. it is determined to drilling well life cycle: according to the average life to drilling well same block or the neighbouring old well of similar block
Periodic quantity T is used as to drilling well life cycle；
D. it determines that eccentric wear administers operation and implements time y: being calculated according to drilling well life cycle T, eccentric wear period Tn, unit is
Integer year；
E. the net present value (NPV) NPVnsum of abrasionproof totle drilling cost AFnsum is calculated: abrasionproof totle drilling cost is net existing in calculating life cycle
Value NPVnsum,
F. alternative well track scheme sucker rod anti-abrasion Index A Fn:AFn=NPVnsum/10000 member is calculated.
Compared with the existing technology, well track of the present invention designs preferred method, has the advantage that
The well track of the present invention for reducing cost in producing well life cycle designs preferred method, comprehensively considers brill
Combined influence of the rod and tube partial-wear to input cost in well, orientation difficulty of construction and production process, multi-scheme Comprehensive Correlation optimizing well
Eye Trajectory Design achievees the purpose that reduce overall cost in life cycle, improves oil field development benefit.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of this method described in the embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The deployment of some fault block geology adjusts development well flatly, and giving mouth coordinate is X:0m, Y:0m, target coordinate X:
600m, Y:0m, vertical depth 2600m.Optimize this well bore track according to the method for the present invention.
(1) alternative well track design scheme
According to mouth coordinate, target spot information is designed for preferred representative a plurality of well track, this well is preliminary
6 representative well tracks are designed, for being preferably applicable in, specific trajectory parameters be see the table below:
(2) different well tracks are calculated and designs drilling cost saving value
Expense and related service fee norm is taken to calculate different tracks cost savings value according to drilling engineering, cost savings are according to alternative
Drilling well and relevant cost is maximum subtracts other scheme cost calculations in the scheme of track.
The wellbore construction cost Cnc under the conditions of each well track design scheme is calculated according to drilling engineering service fee norm, is taken
Drilling cost highest one is used as reference value Ccmax, calculates each saving of well track drilling cost value Cncs, i.e. Cncs=
Ccmax–Cnc；Then zero dimension processing, C are carried outn=Cncs/10000 member；.
Calculated result see the table below:
(3) different well tracks are calculated and orients the difficulty of construction factor
According to the orientation difficulty factor D DI for calculating each well track scheme with dragn=log10((MDn·AHDn·
TORTn)/TVDn)；
Wherein MDnWell depth is measured for nth well track scheme；AHDn: nth well track scheme horizontal displacement；
TORTn: nth well track scheme wellbore tortuosity, straight well section and steady tilted section are calculated by 0.5 °/30m；TVDn: nth wellbore
The vertical well depth of track scheme.
Specific calculated result see the table below:
(4) different well track oil recovery eccentric wear input costs are calculated
1) alternative well track sucker rod axial load is calculated
Pump setting depth 2200m, sucker rod 25mm+22mm specification 1000m+1200m combination, stroke S:4.8m, jig frequency N:2
Beat/min, pump diameter 56mm, oil density 860kg/m3, as follows, alternate trajectory is calculated most in conjunction with alternate trajectory parameter
The axial load laterally located greatly,
Faxi=(Wri+W1)·[1+(S·N)2/1790]
Wherein WriIt is well depth h with the sum of aerial gravity of lower sucker rod, unit N；
W1For gravity of the fluid column on plunger annulus area, W1=(Ap-Ar)·L·g·ρ；
ApFor ram area, m2；ArFor rod area of pumping, m2；
S is stroke, m；N is to rush number, min-1；
L is the length of fluid column；G is gravity coefficient；ρ is fluid density.
Calculated result see the table below:
| Track number | 1 | 2 | 3 | 4 | 5 | 6 |
| Axial force KN | 30.18 | 29.71 | 28.62 | 27.92 | 38.44 | 34.40 |
2) alternative well track sucker rod maximum lateral force is calculated
As follows, it in conjunction with alternative well track parameter and the maximum axial load calculated result laterally located, calculates
Maximum lateral force,
Wherein: WiTo calculate i-th section of aerial specific gravity of sucker rod, N/m；LiIt is long to calculate i-th section of sucker rod
Degree, m；Δ a is rate of azimuth change, °/m；It is averaged hole angle to calculate section, °；Δ θ is to calculate section rate of deviation, °/m.
Calculated result see the table below:
3) single Precautionary Measure input cost is calculated
The measure expense of abrasionproof investment includes anti-wear material expense and operation cost two parts, temporarily disregards to calculate and delay in operational period
Oil well output；From the point of view of the drilled well statistical data of planned well same block, workover treatment expense is 2.5 ten thousand yuan/mouthful, Precautionary Measure
Take, is calculated according to replacement inclination section sucker rod, sucker rod 8m mono-, cost is calculated according to 250 yuan/root.
4) it calculates alternative well track abrasionproof and puts into totle drilling cost
1. reference standard into selection: choose planned well block a bite directional well be used as standard well, kickoff point (KOP) 600m, design
2.4 °/30m of build angle rate designs 17.62 ° of hole angle, designs well depth 2890m.Standard well produces 165 days, checks discovery kickoff point (KOP)
Neighbouring sucker rod serious wear, determines replacement, and to guarantee safety, inclination section position sucker rod carries out whole replacements, replacement oil pumping
30, bar (220m/8m), total cost is 3.25 ten thousand yuan.
2. the average life span of planned well wellblock is 10 years.
3. standard well maximum lateral force are as follows: 69.83KN.
4. calculating alternative well track scheme eccentric wear period Tn, T1=128.38, T2=168.50, T3=121.72, T4
=158.36, T5=163.51, T6=195.08.
Lateral force and the relationship of wear-out period are exponential function relation, and exponent m is 0.6~1.5, and value has with oil well state
It closes, such as moisture content, if shake out, extent of corrosion etc. is related, this calculating takes m=1, calculates alternative well track scheme Precautionary Measure
Period, and then calculate abrasionproof input cost, and according to the operation time, convert for operation time at initial stage net present value (NPV) NPV, abrasionproof it is total
Cost NPV is calculated: the net present value (NPV) NPV of abrasionproof cost in life cycle is calculated,
Y is that eccentric wear administers operation and carries out year and initially goes into operation time in year away from the well, and unit is integer year；
Calculated result see the table below:
| Track number | 1 | 2 | 3 | 4 | 5 | 6 |
| Wear-out period day | 128.38 | 168.50 | 121.72 | 158.36 | 163.51 | 195.08 |
| Ten thousand yuan of cost NPV of abrasion | 26.96 | 32.83 | 26.86 | 31.83 | 40.84 | 42.15 |
5) alternative well track evaluation number is calculated
Parameters obtained will as above be calculated and substitute into following computation model, Fn=a1·Cn-a2·DDIn-a3·SFn m·AFn；
Wherein F: well track evaluation number；N: nth well track scheme code name；a1, a2, a3, weight coefficient；C: it bores
Well save the cost index；DDI: the orientation difficulty factor；SF: lateral force index of the tubing string in well；M: lateral force is to sucker rod
Abrasion index；M is between 0.6~1.2；AFn: nth well track sucker rod anti-abrasion index；AFn=NPVnsum/10000
Member.
Each well track evaluation number is calculated, calculated result see the table below:.
(6) well track preferred result is determined
Well track optimum principle is the maximum well track scheme of F value.It is preferred that well track scheme 1 is as planned well
Optimal well track.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of well track designs preferred method, it is characterised in that: establish well track design evaluatio model, Fn=a1·Cn-
a2·DDIn-a3·SFn m·AFn；
Wherein F: well track evaluation number；N: nth well track scheme code name；a1, a2, a3, weight coefficient；C: drilling well section
About cost index；DDI: the orientation difficulty factor；SF: lateral force index of the tubing string in well；M: abrasion of the lateral force to sucker rod
Index；M is between 0.6~1.2；AFn: nth well track sucker rod anti-abrasion index；
Well track optimum principle is the maximum well track scheme of F value.
2. well track according to claim 1 designs preferred method, it is characterised in that: the drilling well save the cost index
The calculation method of C calculates the wellbore construction cost under the conditions of each well track design scheme according to drilling engineering service fee norm
Cnc takes drilling cost highest one to be used as reference value Ccmax, calculates each well track drilling cost saving value Cncs, i.e.,
Cncs=Ccmax-Cnc；Then zero dimension processing, C are carried outn=Cncs/10000 member.
3. well track according to claim 1 designs preferred method, it is characterised in that: the orientation difficulty factor D DI
Calculation method, according to the orientation difficulty factor D DI for calculating each well track scheme with dragn=log10((MDn·AHDn·
TORTn)/TVDn)；
Wherein MDnWell depth is measured for nth well track scheme；AHDn: nth well track scheme horizontal displacement；TORTn: the
N well track scheme wellbore tortuosity, straight well section and steady tilted section are calculated by 0.5 °/30m；TVDn: nth well track scheme
Vertical well depth.
4. well track according to claim 3 designs preferred method, it is characterised in that: the determination of weight coefficient, a1=1,
a3=1；a2According to being differently directed degree-of-difficulty factor, caused by the difference of drilling cost determine；Design the different wellbore rail of two kinds of DDI
Mark calculates the orientation index of difficulty difference DDI of two kinds of tracksxWith change as DDI caused by cost difference Cx, a2=Cx/(10000×
DDIx)。
5. well track according to claim 1 designs preferred method, it is characterised in that: the tubing string is lateral in well
The calculation method of power index SF,
A. sucker rod axial load is calculated
Faxi=(Wri+W1)·[1+(S·N)2/1790]
Wherein WriIt is well depth h with the sum of aerial gravity of lower sucker rod, unit N；
W1For gravity of the fluid column on plunger annulus area, W1=(Ap-Ar) Lg ρ, L is the length of fluid column；G is gravity system
Number；ρ is fluid density；
ApFor ram area, m2；ArFor rod area of pumping, m2；
S is stroke, m；N is to rush number, min-1；
B. the calculating of lateral force SFn:
Wherein: WiTo calculate i-th section of aerial specific gravity of sucker rod, N/m；LiTo calculate i-th section of oil pumping pole length, m；
Δ a is rate of azimuth change, °/m；It is averaged hole angle to calculate section, °；Δ θ is to calculate section rate of deviation, °/m.
6. well track according to claim 5 designs preferred method, it is characterised in that: well track sucker rod anti-abrasion refers to
The calculating of number AF, includes the following steps,
A. single abrasionproof cost determines: according to oil field same block or neighbouring similar block producing well Precautionary Measure input cost,
Statistics calculates the eccentric abrasion prevention cost AFnc of individual well single investment；
B. the eccentric wear damage period determines:
It is standard well that I, which establishes oil field same block or neighbouring similar block mouthful producing well, counts its sucker rod or oil pipe eccentric wear
Damage cycle T bz；
II, calculates lateral force SFbz at standard well eccentric wear；
III, calculates alternative well track scheme eccentric wear period Tn, Tn=Tbz (SFn/SFbz)m；
C. it is determined to drilling well life cycle: according to the average life period to drilling well same block or the neighbouring old well of similar block
Value T is used as to drilling well life cycle；
D. determine that eccentric wear administers operation and implements time y: according to drilling well life cycle T, the calculating of eccentric wear period Tn, unit is integer
Year；
E. the net present value (NPV) NPVnsum of abrasionproof totle drilling cost AFnsum is calculated: calculating the net present value (NPV) of abrasionproof totle drilling cost in life cycle
NPVnsum,
F. alternative well track scheme sucker rod anti-abrasion Index A Fn:AFn=NPVnsum/10000 member is calculated.
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| CN107060642A (en) * | 2016-12-16 | 2017-08-18 | 河南中源化学股份有限公司 | Horizontal well track control method being connected trona deep-thin layer more |
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