CN108071340A - A kind of well track designs preferred method - Google Patents
A kind of well track designs preferred method Download PDFInfo
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- CN108071340A CN108071340A CN201711318120.6A CN201711318120A CN108071340A CN 108071340 A CN108071340 A CN 108071340A CN 201711318120 A CN201711318120 A CN 201711318120A CN 108071340 A CN108071340 A CN 108071340A
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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
- 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：Establish well track design evaluatio model, Fn=a1·Cn‑a2·DDIn‑a3·SFn m·AFn；Wherein F：Well track evaluation number；n：Nth bar well track scheme code name；a1, a2, a3, weight coefficient；C：The cost-effective index of drilling well；DDI：Orient the difficulty factor；SF：Lateral force index of the tubing string in well；m：Lateral force is to the abrasion index of sucker rod；Between m is 0.6~1.2；AFn：Nth bar well track sucker rod anti-abrasion index；Well track optimum principle is the well track scheme of F values maximum.The present invention considers rod and tube partial-wear in drilling well, orientation difficulty of construction and production process, and to the combined influence of input cost, the preferred wellbore Trajectory Design of multi-scheme Comprehensive Correlation achievees the purpose that reduce comprehensive cost in life cycle, improves oil field development benefit.
Description
Technical field
The invention belongs to oil field drilling technical field, more particularly, to comprehensive cost in a kind of reduction producing well life cycle
Well track design preferred method.
Background technology
Well track is the Anomalistic space three-dimensional channel for connecting ground well head and subsurface geology target point, drilling well, orientation
Well, well logging, well cementation and the involved instrument of later stage production and tubing string 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
It needs to establish a kind of evaluation design method, Comprehensive Assessment optimization well track design.
During wellbore construction, the well track designing scheme of drilling depth minimum can reduce drilling depth cost, theoretically 2 points
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
Hold angle well section length is caused to increase, increases the difficulty of hole cleaning and the frictional resistance of well drilling pipe column, torque, causes lower part drilling support
Pressure, influences construction efficiency, therefore the target optimized 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, beneficial 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, the increase of TRAJECTORY CONTROL difficulty.
Therefore the target of orientation construction operation optimization is that orientation is facilitated to construct and beneficial to TRAJECTORY CONTROL.In well logging construction, inclination section full-shape
Change rate is big, and hole deviation is big, is easy to cause well logging and is hampered, therefore the target optimized in construction of logging well is then reduction or eliminates electrical measurement
It is hampered.In cementing operation, hole deviation is big, hold angle segment length, is easy to cause that setting of casing is hampered, casing centralization is difficult, annular space narrow side replaces
Efficiency is low, and cementing quality is poor；Rate of over-all angle change is big, and casing strength reduces, and set damage in advance easily occurs.Therefore casing and cementing optimizes
Target is to ensure the tripping in of the smooth safety of casing, beneficial to casing centralization, improves replacement efficiency, ensures cementing quality.Later stage produces
In operation, the abrasion between sucker rod and oil pipe is mainly reduced, is reduced due to administering the increased cost of eccentric wear.Particularly 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 solving the technology 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
Various operations in the production entire life cycle of well are all affected by it, and influence will be permanent, therefore well track design is excellent
Choosing will consider the index request that drilling well, orientation construction and later stage production propose it, could reduce comprehensive cost, improve effect
Benefit.
The content of the invention
In view of this, the present invention is directed to propose it is a kind of reduce cost in producing well life cycle well track design it is excellent
Choosing method considers drilling engineering, orientation engineering and later stage 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 individual well synthesis effect
Benefit.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of well track designs 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 bar well track scheme code name；a1, a2, a3, weight coefficient；C：It bores
The cost-effective index of well；DDI：Orient the difficulty factor；SF：Lateral force index of the tubing string in well；m：Lateral force is to sucker rod
Abrasion index；Between m is 0.6~1.2；AFn：Nth bar well track sucker rod anti-abrasion index；
Well track optimum principle is the well track scheme of F values maximum.
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 optimize in aforementioned manners
Selection.
Preferably, the computational methods of the cost-effective index C of the drilling well calculate each wellbore according to drilling engineering service fee norm
Wellbore construction cost Cnc under the conditions of Trajectory Design scheme takes highest one of drilling cost to be calculated as value Ccmax is referred to
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 computational methods of the orientation difficulty factor D DI, each well track scheme is calculated according to drag
Orient difficulty factor D DIn=log10((MDn·AHDn·TORTn)/TVDn)；
Wherein MDnWell depth is measured for nth bar well track scheme；AHDn：Nth bar well track scheme horizontal displacement；
TORTn：Nth bar well track scheme wellbore tortuosity, straight well section and steady tilted section are calculated by 0.5 °/30m；TVDn：Nth bar wellbore
The vertical well depth of track scheme.
Preferably, weight coefficient determine, a1=1, a3=1；a2According to being differently directed degree-of-difficulty factor, caused by drilling well into
This difference determines；The different well tracks of two kinds of DDI are designed, calculate the orientation index of difficulty difference DDI of two kinds of tracksxWith due to
Cost difference C caused by DDI changesx, a2=Cx/(10000x DDIx)。
Preferably, the computational methods 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 WrhIt 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 calculating 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 input into
This, statistics calculates the eccentric abrasion prevention cost of individual well single input；
B. the eccentric wear damage cycle 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. treat that drilling well life cycle determines：According to the average life for treating drilling well same block or the old well of neighbouring similar block
Periodic quantity T is used as and treats drilling well life cycle；
D. determine that eccentric wear administers operation and implements time y：According to treating that drilling well life cycle T, eccentric wear period Tn calculate, 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
F. alternative well track scheme sucker rod anti-abrasion Index A Fn is calculated：AFn=NPVnsum/10000 members.
Compared with the prior art, well track of the present invention designs preferred method, has the advantage that：
The well track design preferred method of the present invention for reducing cost in producing well life cycle, considers brill
Rod and tube partial-wear is to the combined influence of input cost, multi-scheme Comprehensive Correlation optimizing well in well, orientation difficulty of construction and production process
Eye Trajectory Design achievees the purpose that reduce comprehensive cost in life cycle, improves oil field development benefit.
Description of the drawings
The attached drawing for forming the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted 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 case where there is no 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 in conjunction with the embodiments.
Adjustment development well, given mouth coordinate are X to the deployment of some fault block geology flatly: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 designing 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 see the table below：
(2) different well track design drilling cost saving values are calculated
According to drilling engineering expense and related service fee norm is taken to calculate different tracks cost savings value, cost savings are according to alternative
What drilling well and relevant cost were maximum in the scheme of track subtracts other scheme cost calculations.
The wellbore construction cost Cnc under the conditions of each well track designing scheme is calculated according to drilling engineering service fee norm, is taken
Highest one of drilling cost calculates each saving of well track drilling cost value Cncs, i.e. Cncs=as value Ccmax is referred to
Ccmax–Cnc；Then zero dimension processing, C are carried outn=Cncs/10000 members；.
Result of calculation see the table below：
(3) the different well track orientation difficulty of construction factors are calculated
According to the orientation difficulty factor D DI that each well track scheme is calculated with dragn=log10((MDn·AHDn·
TORTn)/TVDn)；
Wherein MDnWell depth is measured for nth bar well track scheme；AHDn：Nth bar well track scheme horizontal displacement；
TORTn：Nth bar well track scheme wellbore tortuosity, straight well section and steady tilted section are calculated by 0.5 °/30m；TVDn：Nth bar wellbore
The vertical well depth of track scheme.
Specific result of calculation 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 specifications 1000m+1200m are combined, stroke S：4.8m, jig frequency N：2
Beat/min, pump footpath 56mm, oil density 860kg/m3, as follows, alternate trajectory is calculated most with reference to alternate trajectory parameter
The big axial load laterally located,
Faxi=(Wri+W1)·[1+(S·N)2/1790]
Wherein WrhIt is well depth h with the sum of aerial gravity of lower sucker rod, unit N；
W1 be gravity of the fluid column on plunger annulus area, W1=(Ap-Ar)·L·g·ρ；
ApFor ram area, m2；Ar for oil pumping rod area, 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.
Result of calculation see the table below：
2) alternative well track sucker rod maximum lateral force is calculated
As follows, with reference to alternative well track parameter and the maximum axial load result of calculation laterally located, calculate
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 calculating section rate of deviation, °/m.
Result of calculation see the table below：
3) single Precautionary Measure input cost is calculated
The measure expense of abrasionproof input takes including anti-wear material and operation cost two parts, temporarily disregards and calculates what is delayed in operational period
Oil well output；From the point of view of the drilled well statistics of planned well same block, workover treatment expense be 2.5 ten thousand yuan/mouthful, Precautionary Measure
Take, calculated according to inclination section sucker rod is replaced, sucker rod 8m mono-, cost is calculated according to 250 yuan/root.
4) alternative well track abrasionproof input totle drilling cost is calculated
1. reference standard into selection：Planned well block a bite directional well is chosen as standard well, kickoff point (KOP) 600m, design
2.4 °/30m of build angle rate designs 17.62 ° of hole angle, design well depth 2890m.Standard well produces 165 days, checks and finds kickoff point (KOP)
Neighbouring sucker rod serious wear determines to replace, and to ensure safety, inclination section position sucker rod carries out whole replacements, replaces oil pumping
Bar 30 (220m/8m), total cost are 3.25 ten thousand yuan.
2. the average life span of planned well wellblock is 10 years.
3. standard well maximum lateral force is：69.83KN.
4. calculate 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 relation 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
Cycle, 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 is administered the time that year of initially going into operation away from the well in year is carried out in operation, and unit is integer year；
Result of calculation 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 |
| Wear ten thousand yuan of cost NPV | 26.96 | 32.83 | 26.86 | 31.83 | 40.84 | 42.15 |
5) alternative well track evaluation number is calculated
Parameters obtained will be calculated as above and substitute into following computation model, Fn=a1·Cn-a2·DDIn-a3·SFn m·AFn；
Wherein F：Well track evaluation number；n：Nth bar well track scheme code name；a1, a2, a3, weight coefficient；C：It bores
The cost-effective index of well；DDI：Orient the difficulty factor；SF：Lateral force index of the tubing string in well；m：Lateral force is to sucker rod
Abrasion index；Between m is 0.6~1.2；AFn：Nth bar well track sucker rod anti-abrasion index；AFn=NPVnsum/10000
Member.
Each well track evaluation number is calculated, result of calculation see the table below：.
(6) well track preferred result is determined
Well track optimum principle is the well track scheme of F values maximum.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 essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
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 bar well track scheme code name；a1, a2, a3, weight coefficient；C：Drilling well section
About cost index；DDI：Orient the difficulty factor；SF：Lateral force index of the tubing string in well；m：Abrasion of the lateral force to sucker rod
Index；Between m is 0.6~1.2；AFn：Nth bar well track sucker rod anti-abrasion index；
Well track optimum principle is the well track scheme of F values maximum.
2. well track according to claim 1 designs preferred method, it is characterised in that：The cost-effective index of drilling well
The computational methods of C calculate the wellbore construction cost under the conditions of each well track designing scheme according to drilling engineering service fee norm
Cnc takes highest one of drilling cost to calculate each well track drilling cost saving value Cncs, i.e., as value Ccmax is referred to
Cncs=Ccmax-Cnc；Then zero dimension processing, C are carried outn=Cncs/10000 members；.
3. well track according to claim 1 designs preferred method, it is characterised in that：The orientation difficulty factor D DI
Computational methods, according to the orientation difficulty factor D DI that each well track scheme is calculated with dragn=log10((MDn·AHDn·
TORTn)/TVDn)；
Wherein MDnWell depth is measured for nth bar well track scheme；AHDn：Nth bar 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 bar well track scheme
Vertical well depth.
4. well track according to claim 3 designs preferred method, it is characterised in that：Definite, a of weight coefficient1=1,
a3=1；a2According to being differently directed degree-of-difficulty factor, caused by the difference of drilling cost determine；Design the different wellbore rails of two kinds of DDI
Mark calculates the orientation index of difficulty difference DDI of two kinds of tracksxWith change due to 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 computational methods of power index SF,
A. sucker rod axial load is calculated
Faxi=(Wri+W1)·[1+(S·N)2/1790]
Wherein WrhIt 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 be fluid column length；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 calculating 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 input；
B. the eccentric wear damage cycle 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. treat that drilling well life cycle determines：According to the average life cycle for treating drilling well same block or the old well of neighbouring similar block
Value T is used as and treats 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 is treated, unit is integer
Year；
E. the net present value (NPV) NPVnsum of abrasionproof totle drilling cost AFnsum is calculated：Calculate 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 is calculated：AFn=NPVnsum/10000 members.
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| CN111206920A (en) * | 2018-11-01 | 2020-05-29 | 中国石油化工股份有限公司 | Natural deviation law evaluation method based on multi-well statistics and stratum characterization |
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| CN108071340B (en) | 2019-08-30 |
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