CN106050216A - Top drive twisting drag reduction method and device capable of improving sliding drilling efficiency - Google Patents
Top drive twisting drag reduction method and device capable of improving sliding drilling efficiency Download PDFInfo
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- CN106050216A CN106050216A CN201610387808.9A CN201610387808A CN106050216A CN 106050216 A CN106050216 A CN 106050216A CN 201610387808 A CN201610387808 A CN 201610387808A CN 106050216 A CN106050216 A CN 106050216A
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- 238000005553 drilling Methods 0.000 title claims abstract description 85
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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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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Abstract
The invention relates to a top drive twisting drag reduction method and device capable of improving the sliding drilling efficiency. The top drive twisting drag reduction method includes the steps that a peripheral friction resistance coefficient f<rotation> and an axial friction resistance coefficient f<sliding> are determined; a lower drill column length L2 needed for bearing the reaction torque of a screw is determined; a safety margin S is set, and an upper twisting drill column length L1 is determined according to the safety margin S and the lower drill column length L2; as the well depth increases, iteration accumulation is carried out to a corresponding well depth from a well opening to the bottom through the peripheral friction resistance coefficient f<rotation>, the upper twisting drill column length L1 and the lower drill column length L2, and a corresponding torque T for twisting an upper drill column is obtained; the minimum value is selected from the torque T, 0.85T<max>, and 0.6T<upper shackle> to serve as the torque limit corresponding to the corresponding well depth; the reversal torque corresponding to the corresponding well depth is obtained according to the torque limit; and the torque range for twisting drag reduction corresponding to the corresponding well depth is determined through the torque limit and the reversal torque, and the twisting drag reduction operation is carried out through the torque range.
Description
Technical field
The present invention relates to field of oil drilling, improve directional well, horizontal well, extended reach well slipping drilling particularly to one
The top of efficiency is driven and is rocked drag reduction method and device.
Background technology
In recent years, along with the continuous decline of China's petroleum resources grade, oil-gas exploration and development is gradually to unconventional, hyposmosis
Field is shifted, and horizontal well, extended reach well can increase reservoir drainage area to greatest extent, improve unconventional, Low Permeability Oil/gas
Hiding well yield and recovery ratio, therefore horizontal well, extended reach well drilling technology become the important of the low-grade oil-gas Layer of Efficient Development
Technical support.But horizontal well, extended reach well drilling process still there are a lot of technological difficulties to have a strong impact on working performance, field practice
All show in horizontal well, extended reach well drilling process with experimentation, particularly during orientation section slipping drilling, drag and torque
Greatly, the pressure of the drill is difficult to effectively be applied on drill bit, causes that bit speed is slow, efficiency is low.Therefore, how to improve slipping drilling efficiency,
It it is horizontal well, extended reach well drilling well Key technique problem urgently to be resolved hurrily.Top drive rock drag reduction technology develop into solution this
Problem brings hope, but top drives that to rock drag reduction technology the most under test at present, not completely ripe, rocks drag reduction operation
During arrange torque limit still rely on experience obtain, can not obtain by theoretical calculation analysis, therefore with down-hole reality
Border situation has certain error, causes top to be driven and rocks operation and can not play optimum efficiency on the premise of safety.
Domestic middle oil drilling institute develops top and drives and rock drag reduction control system model machine, can be with middle oil drilling institute Bei Shiding
Driving and achieve a butt joint, control top is driven main shaft and is back and forth reversed drill string according to torque limit set in advance, it is achieved horizontal well, extended reach well
Slipping drilling rocks drag reduction operation, has carried out the on-the-spot test of many wells time at shale gas horizontal well drilling scene, Sichuan, obtained
Good drag reduction fall is turned round and speed-increasing effect.The setting of torque limit at present still relies on artificial experience and obtains, and can not pass through section
Learn rational algorithm and software calculates, more accurately instruct and rock drag reduction operation.
Summary of the invention
For solving problem of the prior art, the present invention proposes to push up to drive in a kind of raising slipping drilling to rock drag reduction application effect
Method and device, the technical program typing operation data such as the casing programme of well, well track, BHA, drilling parameter,
According to specific algorithm and flow process iterative computation, the torque limit needed for final acquisition and windup-degree, instruct safely and efficiently
Rock drag reduction operation, slipping drilling efficiency and speed are greatly improved.
For achieving the above object, the invention provides a kind of top improving slipping drilling efficiency and drive and rock drag reduction method, bag
Include:
Determine circumference coefficient of friction resistance fRotation, axial coefficient of friction resistance fSliding；
Determine lower drilling string length L2 born required for screw rod reaction torque；
Safe clearance S is set, determines that drill string can be rocked in top according to described safe clearance S and described lower drilling string length L2
Length L1；
Along with the increase of well depth, utilize coefficient of friction resistance fRotation, top can wave drill string length L1, lower drilling string length L2 from well
Mouth down iteration be added to corresponding well depth obtain corresponding to wave required torque T；
From torque T, 0.85Tmax、0.6TUpper shackleIn select minima as the torque limit corresponding to corresponding well depth；And root
The reverse torque corresponding to corresponding well depth is obtained according to torque limit；Wherein, TmaxAt the scene by operating personnel by idle running drill string
Record, TUpper shackleFound by drilling tool handbook, to specific drill string, TUpper shackleFor definite value；
Torque limit and reverse torque is utilized to determine the torque range rocking drag reduction corresponding to corresponding well depth；
Described torque range is utilized to carry out rocking drag reduction operation.
Preferably, also include:
Utilize axial coefficient of friction resistance fSliding, top can wave drill string length L1, lower drilling string length L2 from well head down iteration
It is added to the frictional resistance F corresponding to the acquisition of corresponding well depth.
Preferably, also include:
Torque T is utilized to determine the windup-degree corresponding to corresponding well depth；And it is right to obtain corresponding well depth institute according to windup-degree
The number of turns answered.
Preferably, the step of described lower drilling string length L2 determined required for bearing screw rod reaction torque includes:
From shaft bottom up according to the drill string torque corresponding to every meter of calculating, the drill string torque that every meter corresponding is tired out
Add, during until moment of torsion accumulated value is equal to screw rod output moment of torsion, a length of lower drilling string length L2 corresponding to accumulation calculating.
Preferably, described determine that top can be waved the step of drill string length L1 and be included:
Well depth deducts lower drilling string length L2, then deducts safe clearance S, it is thus achieved that drill string length L1 can be waved in top.
Preferably, the expression formula of described torque T is:
T=RfRotation∫ρg sinαSxdx
Wherein, R is drill string external diameter, fRotationFor the circumference coefficient of friction resistance, ρ is the drill string density considering drilling fluid buoyancy, and g is gravity
Acceleration, α is hole angle, SxFor drill string cross-sectional area, x is drill string length, value between L1 and L2.
Preferably, the expression formula of described frictional resistance F is:
F=fSliding∫ρg sinαSxdx
Wherein, fSlidingFor the axial coefficient of friction resistance, ρ is the drill string density considering drilling fluid buoyancy, and g is acceleration of gravity, and α is well
Oblique angle, SxFor drill string cross-sectional area, x is drill string length, value between L1 and L2.
Preferably, described reverse torque is multiplied by 0.7 equal to described torque limit.
Preferably, the described number of turns is equal to described windup-degree divided by 360 degree.
For achieving the above object, present invention also offers a kind of top improving slipping drilling efficiency and drive and rock damping device,
Including:
The coefficient of friction resistance determines unit, is used for determining circumference coefficient of friction resistance fRotation, axial coefficient of friction resistance fSliding；
Lower drilling string length determination unit, for determining lower drilling string length L2 born required for screw rod reaction torque；
Upper drilling string length determination unit, is used for arranging safe clearance S, bores according to described safe clearance S and described bottom
Column length L2 determines that drill string length L1 can be waved in top；
Moment of torsion determines unit, for along with the increase of well depth, utilizes coefficient of friction resistance fRotation, top can wave drill string length L1,
Lower drilling string length L2 is added to corresponding well depth from well head down iteration and obtains and corresponding wave required torque T；
Torque limit unit, for from torque T, 0.85Tmax、0.6TUpper shackleIn select minima as corresponding well depth institute right
The torque limit answered；And obtain the reverse torque corresponding to corresponding well depth according to torque limit；Wherein, TmaxAt the scene by making
Industry personnel by carry drill string and record, TUpper shackleFound by drilling tool handbook, to specific drill string, TUpper shackleFor definite value；
Torque range determines unit, and for utilizing torque limit and reverse torque to determine, the moment of torsion corresponding to corresponding well depth subtracts
The torque range of resistance；
Rock drag reduction unit, be used for utilizing described torque range to carry out rocking drag reduction operation.
Technique scheme has the advantages that
The technical program helps to rock drag reduction slipping drilling operator and obtains optimal torque limit in time and rock angle
Degree, the frictional resistance understood during drill string rocks in well, moment of torsion distribution situation, evaluate the implementation result rocking drag reduction operation,
In the case of not affecting tool-face, reduce drill string frictional resistance, moment of torsion as far as possible, discharge the pressure of the drill, improve slipping drilling efficiency.On-the-spot examination
Testing and show, in slipping drilling, frictional resistance, moment of torsion averagely reduce by more than 30%, and average rate of penetration improves more than 20%.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 rocks the method flow diagram of drag reduction for a kind of raising that the present invention provides；
Fig. 2 rocks the device block diagram of drag reduction for a kind of raising that the present invention provides；
Fig. 3 is the software overall logic figure of the present embodiment；
Fig. 4 is the present embodiment software development flow figure；
Fig. 5 is the present embodiment software main interface schematic diagram；
Fig. 6 is the present embodiment software login interface schematic diagram；
Fig. 7 is the present embodiment result display screen schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The operation principle of the technical program is: this technology of the technical program is applicable to horizontal well, extended reach well top is driven and rocked
Slipping drilling operation, rocks the offer Theoretical Calculation support of drag reduction control system by driving for top, realizes more safely and efficiently subtracting
Resistance fall is turned round and release the pressure of the drill, improves rate of penetration.The technical program can calculate drill string during top is driven and rocked slipping drilling
Suffered frictional resistance, moment of torsion distribution situation, be given and rock torque limit, forward position well depth, windup-degree and the rotation that drag reduction technique needs
The number of turns, exports moment of torsion, frictional resistance, release the pressure of the drill, windup-degree with the change curve of well depth simultaneously, aobvious on terminal fluorescent screen
These curves are shown, it is simple to drilling operator grasps and rocks drag reduction performance, it is ensured that in the situation not affecting tool face azimuth
Under, security implementation rocks drag reduction operation, effectively reduces the drag and torque during horizontal well, extended reach well slipping drilling, solves
Drilling tool backing pressure problem.
According to above-mentioned operation principle, the invention provides a kind of method that drag reduction is rocked in raising, as shown in Figure 1.Including:
Step 101): determine circumference coefficient of friction resistance fRotation, axial coefficient of friction resistance fSliding；
Step 102): determine lower drilling string length L2 born required for screw rod reaction torque；
In this step, step 102 is particularly as follows: from shaft bottom up according to the drill string torque corresponding to every meter of calculating, incite somebody to action every
Drill string torque corresponding to meter adds up, during until moment of torsion accumulated value is equal to screw rod reaction torque, and length corresponding to accumulation calculating
For lower drilling string length L2.
Step 103): safe clearance S is set, determines top according to described safe clearance S and described lower drilling string length L2
Drill string length L1 can be waved；
In this step, well depth deducts lower drilling string length L2, then deducts safe clearance S, it is thus achieved that drill string can be waved in top
Length L1.For the technical program, the span of safe clearance S is 50m～100m.
Step 104): along with the increase of well depth, utilize coefficient of friction resistance fRotation, top can wave drill string length L1, lower drilling string
Length L2 is added to corresponding well depth from well head down iteration and obtains and corresponding wave required torque T；
The expression formula of described torque T is:
T=RfRotation∫ρgsinαSxdx
Wherein, R is drill string external diameter, fRotationFor the circumference coefficient of friction resistance, ρ is the drill string density considering drilling fluid buoyancy, and g is gravity
Acceleration, α is hole angle, SxFor drill string cross-sectional area, x is drill string length, value between L1 and L2.Due to drill string external diameter R,
Drill string cross-sectional area Sx, density p, hole angle α all change with the change of well depth, therefore use Finite Element by computation model from
Dispersion, is 1 computing unit with every 1 meter of drill string, the method calculated torque that iteration is cumulative.
Step 105): from torque T, 0.85Tmax、0.6TUpper shackleIn select minima as the moment of torsion corresponding to corresponding well depth
The limit；And obtain the reverse torque corresponding to corresponding well depth according to torque limit；Wherein, TmaxLed to by operating personnel at the scene
Cross idle running drill string to record, TUpper shackleFound by drilling tool handbook, to specific drill string, TUpper shackleFor definite value；
For step 105, described reverse torque is multiplied by 0.7 equal to described torque limit.
Step 106): utilize torque limit and reverse torque to determine the moment of torsion model of the moment of torsion drag reduction corresponding to corresponding well depth
Enclose；
Step 107): utilize described torque range to carry out rocking drag reduction operation.
Preferably, the technical program also includes: utilize axial coefficient of friction resistance fSliding, top can wave drill string length L1, bottom
Drill string length L2 is added to corresponding well depth from well head down iteration and obtains corresponding frictional resistance F.The expression formula of described frictional resistance F is:
F=fSliding∫ρg sinαSxdx
Wherein, fSlidingFor the axial coefficient of friction resistance, ρ is the drill string density considering drilling fluid buoyancy, and g is acceleration of gravity, and α is well
Oblique angle, SxFor drill string cross-sectional area, x is drill string length, value between L1 and L2.Due to drill string cross-sectional area Sx, density p, well
Bevel angle α all changes with the change of well depth, therefore uses Finite Element by computation model discretization, is in terms of 1 by every 1 meter of drill string
Calculate unit, the method calculated torque that iteration is cumulative.
Preferably, the technical program also includes: utilize torque T to determine the windup-degree corresponding to corresponding well depth；And according to
Windup-degree obtains the number of turns corresponding to corresponding well depth.Wherein, the described number of turns is equal to described windup-degree divided by 360 degree.
As in figure 2 it is shown, the device block diagram of drag reduction is rocked in a kind of raising provided for the present invention.Including:
The coefficient of friction resistance determines unit 201, is used for determining circumference coefficient of friction resistance fRotation, axial coefficient of friction resistance fSliding；
Lower drilling string length determination unit 202, for determining lower drilling string length L2 born required for screw rod reaction torque；
Upper drilling string length determination unit 203, is used for arranging safe clearance S, according to described safe clearance S and described bottom
Drill string length L2 determines that drill string length L1 can be rocked in top；
Moment of torsion determines unit 204, for along with the increase of well depth, utilizes coefficient of friction resistance fRotation, top can rock drill string length
L1, lower drilling string length L2 are added to corresponding well depth from well head down iteration and obtain and corresponding rock required torque T；
Torque limit unit 205, for from torque T, 0.85Tmax、0.6TUpper shackleIn select minima as corresponding well depth institute
Corresponding torque limit；And obtain the reverse torque corresponding to corresponding well depth according to torque limit；Wherein, TmaxPass through at the scene
Operating personnel is recorded by idle running drill string, TUpper shackleFound by drilling tool handbook, to specific drill string, TUpper shackleFor definite value；
Torque range determines unit 206, for utilizing torque limit and reverse torque to determine the torsion corresponding to corresponding well depth
The torque range of pendulum drag reduction；
Rock drag reduction unit 207, be used for utilizing described torque range to carry out slipping drilling and rock drag reduction operation.
Embodiment:
As it is shown on figure 3, be the software overall logic figure of the present embodiment.This software kit is containing data inputting, algorithm realization, information
The functional modules such as the storage of logic, data, data derivation, curve plotting, image preservation.
Data inputting module, for being responsible for obtaining the data such as casing programme, well track, BHA, drilling parameter, and
Storage is to data memory module；
Algorithm realizes module, is responsible for according to storage data, frictional resistance, the torque T of every meter of well depth being calculated and being added up, returns
Return value and be stored in global data buffer area；Utilize torquemeter to calculate windup-degree, determine the number of turns according to windup-degree；
Information editing's module, carries out logical judgment for being responsible for realizing algorithm the torque T of module output, from T,
0.85Tmax、0.6TUpper shackleIn select minima as torque limit；And utilize torque limit to determine reverse torque；
Data memory module, the significant data such as the frictional resistance by logging data, calculated, moment of torsion, windup-degree, the number of turns preserves
To data base；
Data derive module, it is possible to the data such as every meter of frictional resistance by the hole trajectory data of input, calculating, moment of torsion derive
Become Excel file, and the parameters such as torque limit, frictional resistance, windup-degree, reverse torque can be given on result display screen；
Curve plotting module, is responsible for drawing out frictional resistance, moment of torsion, the pressure of the drill, rocking the angle change curve with well depth；
Image preserves module, it is possible to the curve that curve plotting module is given is exported to jpeg file.
During horizontal well, extended reach well rock drag reduction slipping drilling, drill string frictional resistance, moment of torsion are with the variation relation table of well depth
Reach formula:
Torque T=RfRotation∫ρg sinαSxdx
Frictional resistance F=fSliding∫ρg sinαSxdx
In formula: R is drill string external diameter, mm；fRotationFor the circumference coefficient of friction resistance；fSlidingFor the axial coefficient of friction resistance；ρ is for considering that drilling fluid floats
The drill string density of power, g/cm3；G is acceleration of gravity, kg m/s2；α is hole angle, °；SxFor drill string cross-sectional area, mm2。
Owing to drill string external diameter, cross-sectional area, density, hole angle all change with the change of well depth, therefore use finite elements
Method, by computation model discretization, is 1 computing unit with every 1 meter of drill string, and the method that iteration adds up calculates frictional resistance and moment of torsion.
As shown in Figure 4, for the present embodiment software development flow figure.First have to understand the influence factor of the coefficient of friction resistance, pass through
Empirical coefficient method or formula iteration anti-inference method obtain the coefficient of friction resistance of operation well, by well track, casing programme, BHA,
The data inputting softwares such as drilling parameter, then iterative computation drill string torque from lower to upper at screw rod, until moment of torsion accumulated value energy
Enough till balance screw rod reaction torque, determine lower drilling string length L2 born required for screw rod reaction torque, certain safety is set
By " well depth-L2-S ", distance S, just can determine that drill string length L1 is rocked on top, then rocks from well head down iterative computation required
Moment of torsion and the frictional resistance of corresponding release, accumulation calculating to well depth is L1.Further, along with the increase of well depth, the coefficient of friction resistance is utilized
fRotation, drill string length L1 can be waved in top, lower drilling string length L2 is added to corresponding well depth from well head down iteration and obtains corresponding
Wave required torque T, by the torque T calculated and 0.85TmaxAnd 0.6TUpper shackleContrast, take the numerical value conduct of minimum
Torque limit, calculates and exports corresponding frictional resistance, windup-degree and the number of turns, instructs and rocks drag reduction operation.
As it is shown in figure 5, be the present embodiment software main interface schematic diagram.The main interface of software includes well information, well track, well
Body structure, BHA (from top to bottom), the inverse coefficient of friction resistance, parameter typing, result show 7 parts, inverse coefficient of friction resistance circle
The axial coefficient of friction resistance of inverse Open-Hole Section and the circumference coefficient of friction resistance can be come according to the operation actual measurement frictional resistance of well, moment of torsion in face, and result shows
Show that interface can show the numerical value of calculating, form and curve, and the derivation of data and image can be supported.
As shown in Figure 6, for the present embodiment software login interface schematic diagram.In figure 6, left mouse button clicks login interface i.e.
The main interface of software can be entered.
As it is shown in fig. 7, be the present embodiment result display screen schematic diagram.Provide the calculated examples operating well flatly, including turning round
Moment pole limit, frictional resistance, rocking the parameters such as angle and show, the calculating tables of data of every meter and 4 kinds of parameters are with the change curve of well depth, it is recommended that
Torque limit 2.6kNm, discharges frictional resistance 4.1t, applies the pressure of the drill 3.42t, rocks angle 353.8 °, rotates 0.98 circle, it is recommended that reversion
Moment of torsion 1.82kNm.
Before carrying out horizontal well, extended reach well rock drag reduction operation, understand the experience coefficient of friction resistance in local drilling well or
Utilize the field measurement data inverse coefficient of friction resistance, collect the operation well track of well, casing programme, BHA, mud density,
The data such as well depth, rate of penetration, and be entered in drag and torque software for calculation.The helicoid hydraulic motor work provided according to screw rod producer
Characteristic, sets up relation between helicoid hydraulic motor output moment of torsion and drilling fluid pressure reduction, calculates screw rod output moment of torsion, and is entered into frictional resistance
Torque arithmetic software.Observe hole trajectory data, if not whole rice data, every meter need to be calculated by point algorithm of inserting that software carries
Hole deviation data, and be stored in data base.Click on computed push-buttom, the parameter such as iterative computation every meter frictional resistance, moment of torsion, calculate complete
After, open result display interface, it can be seen that software output torque limit, frictional resistance, rock the data such as angle, reverse torque,
It is input to torque limit push up and drives in the control interface rocking drag-reduction system, top is driven and rocks drag reduction control system and top and drive control
Platform docks, and top is driven and automatically carried out rocking drag reduction operation according to control program, and well depth often increases 100m and again collects field data meter
Calculate, it is thus achieved that up-to-date torque limit, update to drive to top and rock drag reduction control system, instruct system to carry out more efficiently to rock and subtract
Resistance slipping drilling operation.Rock in operation process, effect, frictional resistance can be rocked by the chart that software is derived to Field Force's introduction
Moment of torsion is distributed, rocks the situations such as forward position well depth, improves field operation personnel to rocking the degree of awareness of drag reduction drilling technology and connecing
By degree of recognition.
Above detailed description of the invention, has been carried out the most specifically the purpose of the present invention, technical scheme and beneficial effect
Bright, be it should be understood that the detailed description of the invention that these are only the present invention, the protection model being not intended to limit the present invention
Enclose, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in the present invention
Protection domain within.
Claims (10)
1. the top improving slipping drilling efficiency is driven and is rocked drag reduction method, it is characterised in that including:
Determine circumference coefficient of friction resistance fRotation, axial coefficient of friction resistance fSliding；
Determine lower drilling string length L2 born required for screw rod reaction torque；
Safe clearance S is set, determines that drill string length can be rocked in top according to described safe clearance S and described lower drilling string length L2
L1；
Along with the increase of well depth, utilize coefficient of friction resistance fRotation, that drill string length L1, lower drilling string length L2 can be waved in top is past from well head
Lower iteration be added to corresponding well depth obtain corresponding to rock required torque T；
From torque T, 0.85Tmax、0.6TUpper shackleIn select minima as the torque limit corresponding to corresponding well depth；And according to torsion
Moment pole limit obtains the reverse torque corresponding to corresponding well depth；Wherein, TmaxSurveyed by idle running drill string by operating personnel at the scene
, TUpper shackleFound by drilling tool handbook, to specific drill string, TUpper shackleFor definite value；
Torque limit and reverse torque is utilized to determine the torque range of the moment of torsion drag reduction corresponding to corresponding well depth；
Described torque range is utilized to carry out rocking drag reduction operation during slipping drilling.
2. the method for claim 1, it is characterised in that also include:
Utilize axial coefficient of friction resistance fSliding, top can wave drill string length L1, lower drilling string length L2 from well head down iteration add up
To the frictional resistance F corresponding to the acquisition of corresponding well depth.
3. method as claimed in claim 1 or 2, it is characterised in that also include:
Torque T is utilized to determine the windup-degree corresponding to corresponding well depth；And obtain corresponding to corresponding well depth according to windup-degree
The number of turns.
4. method as claimed in claim 1 or 2, it is characterised in that described determine the bottom born required for screw rod reaction torque
The step of drill string length L2 includes:
From shaft bottom up according to the drill string torque corresponding to every meter of calculating, the drill string torque that every meter corresponding is added up, directly
To moment of torsion accumulated value equal to screw rod output moment of torsion time, a length of lower drilling string length L2 corresponding to accumulation calculating.
5. method as claimed in claim 1 or 2, it is characterised in that the described step determining that drill string length L1 can be rocked in top
Including:
Well depth deducts lower drilling string length L2, then deducts safe clearance S, it is thus achieved that drill string length L1 can be waved in top.
6. method as claimed in claim 1 or 2, it is characterised in that the expression formula of described torque T is:
T=RfRotation∫ρg sinαSxdx
Wherein, R is drill string external diameter, fRotationFor the circumference coefficient of friction resistance, ρ is the drill string density considering drilling fluid buoyancy, and g is that gravity accelerates
Degree, α is hole angle, SxFor drill string cross-sectional area, x is drill string length, value between L1 and L2.
7. method as claimed in claim 2, it is characterised in that the expression formula of described frictional resistance F is:
F=fSliding∫ρg sinαSxdx
Wherein, R is drill string external diameter, fSlidingFor the axial coefficient of friction resistance, ρ is the drill string density considering drilling fluid buoyancy, and g is that gravity accelerates
Degree, α is hole angle, SxFor drill string cross-sectional area, x is drill string length, value between L1 and L2.
8. method as claimed in claim 1 or 2, it is characterised in that described reverse torque is multiplied by equal to described torque limit
0.7。
9. method as claimed in claim 3, it is characterised in that the described number of turns is equal to described windup-degree divided by 360 degree.
10. the top improving slipping drilling efficiency is driven and is rocked damping device, it is characterised in that including:
The coefficient of friction resistance determines unit, is used for determining circumference coefficient of friction resistance fRotation, axial coefficient of friction resistance fSliding；
Lower drilling string length determination unit, for determining lower drilling string length L2 born required for screw rod reaction torque；
Upper drilling string length determination unit, is used for arranging safe clearance S, long according to described safe clearance S and described lower drilling string
Degree L2 determines that drill string length L1 can be rocked in top；
Moment of torsion determines unit, for along with the increase of well depth, utilizes coefficient of friction resistance fRotation, top can wave drill string length L1, bottom
Drill string length L2 is added to corresponding well depth from well head down iteration and obtains and corresponding wave required torque T；
Torque limit unit, for from torque T, 0.85Tmax、0.6TUpper shackleIn select minima as corresponding to corresponding well depth
Torque limit；And obtain the reverse torque corresponding to corresponding well depth according to torque limit；Wherein, TmaxAt the scene by operation people
Member is recorded by idle running drill string, TUpper shackleFound by drilling tool handbook, to specific drill string, TUpper shackleFor definite value；
Torque range determines unit, for utilizing torque limit and reverse torque to determine the drag reduction that rocks corresponding to corresponding well depth
Torque range；
Rock drag reduction unit, be used for utilizing described torque range to carry out rocking drag reduction operation during slipping drilling.
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| CN109025801A (en) * | 2018-07-06 | 2018-12-18 | 中国石油集团川庆钻探工程有限公司 | Method for determining swing range of sliding drilling drill column |
| CN109083595A (en) * | 2018-09-30 | 2018-12-25 | 四川宏华电气有限责任公司 | A kind of fast slide-and-guide boring method |
| CN110500034A (en) * | 2019-08-30 | 2019-11-26 | 中国石油集团川庆钻探工程有限公司 | Method for establishing neural network model, determining torsional pendulum drill string parameters and directionally drilling |
| CN110500034B (en) * | 2019-08-30 | 2021-03-19 | 中国石油集团川庆钻探工程有限公司 | Method for establishing neural network model, determining torsional pendulum drill string parameters and directionally drilling |
| CN110457866A (en) * | 2019-08-31 | 2019-11-15 | 中国石油集团川庆钻探工程有限公司 | Friction resistance prediction method and friction resistance reduction method in whole sliding drilling process |
| CN110529099A (en) * | 2019-08-31 | 2019-12-03 | 中国石油集团川庆钻探工程有限公司 | Calculation method for accumulated static friction resistance in static friction area and method for reducing friction resistance |
| CN110529099B (en) * | 2019-08-31 | 2023-11-14 | 中国石油集团川庆钻探工程有限公司 | Method for calculating accumulated static friction resistance of static friction area and method for reducing friction resistance |
| CN111255433A (en) * | 2020-03-02 | 2020-06-09 | 北京四利通控制技术股份有限公司 | Anti-sticking anti-drag automatic torsional pendulum control method for well drilling sliding drilling |
| CN111255433B (en) * | 2020-03-02 | 2021-07-27 | 北京四利通控制技术股份有限公司 | Anti-sticking anti-drag automatic torsional pendulum control method for well drilling sliding drilling |
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