CN110457866A - Slipping drilling overall process frictional resistance prediction technique reduces frictional resistance method - Google Patents
Slipping drilling overall process frictional resistance prediction technique reduces frictional resistance method Download PDFInfo
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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
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- E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
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Abstract
The present invention provides a kind of prediction techniques of slipping drilling overall process frictional resistance and the method for reducing slipping drilling frictional resistance.The prediction technique includes: setting drill bit initial position；Divide artis；Rock active region, static friction area, reaction torque active region in Preliminary division ground；Calculate each artis frictional resistance in three areas；Every drilling unit distance just repeats the above steps；The frictional resistance set of each artis must be corresponded to after drilling well, each set includes all frictional resistance of an artis.The reduction frictional resistance method includes: to obtain the accumulation frictional resistance to artis each in operation well in above-mentioned 3 areas according to above-mentioned prediction technique；By descending order using artis corresponding to preceding 1 or multiple accumulation frictional force as reference position；Hydroscillator is installed according to reference position on drilling rod to reduce frictional resistance.The beneficial effect comprise that the reasonable installation of hydroscillator can be realized, it can avoid backing pressure serious problems.
Description
Technical field
The present invention relates to oil/gas drilling (probing) field of engineering technology, particularly, are related to a kind of slipping drilling overall process and rub
The method wiped the prediction technique of resistance and reduce slipping drilling frictional resistance.
Background technique
Either straight well, directional well or horizontal well, the frictional resistance in drilling process between drill string and the borehole wall are all to influence to bore
The key factor of speed.It will lead to that rate of penetration is low, tool as drill assembly and additional torque and frictional resistance caused by wall friction
Face control is difficult, single time drilling ruler seldom, abnormal serious drill string and bit wear etc., when accumulation frictional force is more than applying brill
It just will appear backing pressure phenomenon when pressure, force tubing string that dextrorotation bending or Helical Buckling occurs.It is high for directional well and horizontal well
Frictional resistance also will form crooked hole, so that cause drilling machine to bore reduces up to the ability of depth capacity, or even influence whether oil well output.
It is axially or transversally vibrated practice have shown that generating drill string using hydroscillator, can effectively reduce slipping drilling drilling tool
The frictional force of combination and the borehole wall is simultaneously effectively improved load transfer, improves slipping drilling speed and effect.It is fixed using hydroscillator
It can be greatly improved to drilling efficiency, more smooth wellbore can be drilled out, and single time brill efficiency improves very much.
In the prior art, the installation site of hydroscillator determines with drilling experience and static calculation, is mainly limited to
Analysis and calculating under fixed well depth, lack the dynamic analysis and calculating of drilling process frictional resistance overall process, waterpower are caused to be shaken
Device installation is swung without corresponding and fixed reference foundation, comprehensive consideration level is low, and it is not very practical, thus nothing after hydroscillator installation
Method has the frictional resistance reduced between drill string and the borehole wall to the maximum extent.Therefore, current hydroscillator is applied in slipping drilling
In be heuristic setting, cause hydroscillator may not give slipping drilling drilling tool reducing friction resistance, instead, install water
The financial burden of drilling engineering is increased after forced oscillation device.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to solve above-mentioned one existing in the prior art
Or multiple problems.For example, one of the objects of the present invention is to provide a kind of prediction techniques of slipping drilling overall process frictional resistance
With reduce slipping drilling frictional resistance method, to eliminate or weaken drill string frictional resistance.
To achieve the goals above, one aspect of the present invention provides a kind of prediction side of slipping drilling overall process frictional resistance
Method.
The prediction technique may include step: the initial position of drill bit in setting drilling process；According to the initial position
The length of drill string is calculated, and each artis is divided according to the length of drill string, the artis is at tool joint；Based on institute
When stating initial position calculating ground and rock action length and reaction torque action length, and being based on the calculated result for slipping drilling
The distribution Preliminary division of drill string frictional force is three areas: rocking active region, static friction area, reaction torque active region in ground；Meter
Calculate the frictional resistance that can respectively enter each artis in the preliminary area Hua Housange；It is simulated from the initial position
Slipping drilling, every simulation slipping drilling unit distance just redefine a bit location, after each determining bit location
Each artis is just repartitioned, three areas are repartitioned and recalculates each artis in the division area Hou Sange
Frictional resistance；After simulating slipping drilling, obtain determining that bit location posterior joint point quantity is identical and right with last time
The frictional resistance set of each artis is answered, each set contains institute of artis during simulating slipping drilling
There is frictional resistance.
It is described to set in an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention
The step of determining the initial position of drill bit in drilling process can include: analysis hole angle size determines the time, and then determines that drill bit exists
The location of in wellbore, such as hole angle is more than or equal to 10 °.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, described
Before setting drill bit initial position, the prediction technique may further comprise the step of: planning well track.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, it can be used
It keeps a grip on mechanical model and calculates surface torque and act on zero point and screw rod reaction torque downwards along drill string and act on zero point upwards along drill string, acquire
Surface torque action length and screw rod reaction torque action length.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, the base
The step of distribution Preliminary division of drill string frictional force is three areas when calculated result is by slipping drilling can include: according to institute
Surface torque action length, screw rod reaction torque action length and drill string entire length are stated, determines the length in the static friction area；Into
And it can determine three friction zones.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, the meter
The step of calculating frictional resistance can include: be based on basic data, the frictional resistance is calculated using tubular buckling.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, the base
Plinth data can include: the well track of planning, preset construction parameter and preset material parameter.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, the well
Eye trajectory parameters may include well depth, hole angle, drift azimuth.The construction parameter may include drilling speed, ground output torque, spiral shell
Bar operting differential pressure, tubing string revolving speed, drill string circumferential movement speed and axial movement speed.The material parameter may include friction system
Number, the coefficient of heat conduction, tubing string radius, tubing string weight.
In an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention, the list
Position distance can be 0.5~10m.
It is described pre- in an exemplary embodiment of the prediction technique of slipping drilling overall process frictional resistance of the invention
Survey method, which may further comprise the step of:, divides the frictional resistance in each set according to the first, second, and third class,
In, first kind frictional resistance is that artis is in frictional resistance when active region is rocked on ground, and the second class frictional resistance is joint
Frictional resistance when point is in static friction area, third class are frictional resistance when artis is in reaction torque active region；It will be each
The frictional resistance of identical type carries out accumulation calculating in set, and obtains the corresponding first kind accumulation friction resistance of each artis
Power, the second class accumulation frictional resistance and third class accumulate frictional resistance, wherein do not have first, second or the in the set
When three classes frictional resistance, corresponding frictional resistance of accumulating is calculated as 0.
Another aspect of the present invention provides a kind of method for reducing slipping drilling frictional resistance.The method may include following
Step: in operation well, each pass is obtained according to the prediction technique of slipping drilling overall process frictional resistance as described above
The corresponding first kind accumulation frictional resistance of node, the second class accumulation frictional resistance and third class accumulate frictional resistance；According to from big
To small sequence, using artis corresponding to preceding m first kind accumulation frictional force as the first reference position, m >=1；According to from
Small sequence sequence is arrived greatly, using artis corresponding to preceding n the second class accumulation frictional force as the second reference position, n >=1；
According to sequence sequence from big to small, using artis corresponding to preceding s third class accumulation frictional force as third reference position,
s≥1；According to first, second, and third reference position, described to install hydroscillator on drilling rod used in operation, lead to
Hydroscillator is crossed to reduce the frictional resistance of drilling rod in drilling process.
Compared with prior art, beneficial effects of the present invention can include: hydroscillator may be implemented and eliminate to greatest extent
Or weaken drill string frictional resistance, it avoids pressing serious problems when slipping drilling, improves drill string and rock slide drilling efficiency.
Detailed description of the invention
By the description carried out with reference to the accompanying drawing, above and other purpose of the invention and feature will become more clear
Chu, in which:
Fig. 1 shows a flow diagram of the method for reduction slipping drilling frictional resistance of the invention.
Specific embodiment
Hereinafter, slipping drilling overall process friction of the invention will be described in detail in conjunction with attached drawing and exemplary embodiment
The prediction technique of resistance and the method for reducing slipping drilling frictional resistance.
One aspect of the present invention provides a kind of prediction technique of slipping drilling overall process frictional resistance.
In an exemplary embodiment of the present invention, the method can comprise the following steps that
S01: analysis hole angle size determines time t, determines drill bit locating initial position in the wellbore.Where it is assumed that
The initial position of drill bit be a certain hole angle under the conditions of bit location, such as when hole angle >=10 ° drill bit position.Time t
Time when being hole angle >=10 ° can obtain bit location according to revolving speed and time.Such as can analyze hole angle be 12 ° when
The initial position of drill bit.
S02: the length of drill string is simulated according to the initial position, and each artis, institute are divided according to the length of drill string
Stating artis is at tool joint.
S03: ground is calculated based on the initial position and rocks action length and reaction torque action length, and based on described
It is three areas that result, which is calculated, by the distribution Preliminary division of drill string frictional force when slipping drilling: rocking active region, static friction in ground
Area and reaction torque active region.
S04: the frictional resistance that can respectively enter each artis in the preliminary area Hua Housange is calculated.
S05: from the initial position of the drill bit, every simulation slipping drilling unit distance just repeat the above steps S01~
S04, the initial position of drill bit becomes bit location in corresponding step (1).For example, every simulation slipping drilling unit distance, weight
As soon as newly determining time bit location, each artis is repartitioned after each determining bit location, repartitions described three
A area and the frictional resistance for recalculating each artis in the division area Hou Sange.
S06: after simulating slipping drilling, obtain with last time determine bit location posterior joint point quantity it is identical,
And multiple frictional resistance set of corresponding each artis, each frictional resistance set contain an artis and bore in simulation
Into all frictional resistance in the process.
In the present embodiment, the prediction technique may further comprise the step of:
S07: the frictional resistance in each set is divided according to the first, second, and third class, wherein first
Class frictional resistance is that artis is in frictional resistance when active region is rocked on ground, and the second class frictional resistance is that artis is in quiet
Frictional resistance when friction zone, third class are frictional resistance when artis is in reaction torque active region.
The frictional resistance of identical type in each set is subjected to accumulation calculating, and obtains each artis corresponding first
Class accumulates frictional resistance, the second class accumulation frictional resistance and third class and accumulates frictional resistance, wherein does not have the in the set
One, second or when third class frictional resistance, corresponding frictional resistance of accumulating is calculated as 0.Such as do not have in the corresponding set of an artis
There is first kind frictional resistance, then after accumulation calculating, the first kind accumulation frictional resistance of the artis is just 0.
Another aspect of the present invention provides a kind of method for reducing slipping drilling frictional resistance.
In an exemplary embodiment of reduction slipping drilling frictional resistance method of the invention, the reduction sliding is bored
May include step into frictional resistance method:
In to operation well, according to the prediction technique of above-mentioned slipping drilling overall process frictional resistance, that is predicted is every
The corresponding first kind accumulation frictional resistance of a artis, the second class accumulation frictional resistance and third class accumulate frictional resistance.
By the first kind accumulation frictional resistance of all artis according to sequence from big to small, the preceding m first kind is accumulated
Artis corresponding to frictional force is as the first reference position, the integer that m is >=1.
By the second class accumulation frictional resistance of all artis according to sequence from big to small, by preceding n the second class accumulations
Artis corresponding to frictional force is as the second reference position, the integer that n is >=1.
By the third class accumulation frictional resistance of all artis according to sequence from big to small, preceding s third class is accumulated
Artis corresponding to frictional force is as third reference position, the integer that s is >=1.
According to first, second, and third reference position, described to install hydroscillator on drilling rod used in operation,
The frictional resistance of drilling rod in drilling process is reduced by hydroscillator.It wherein, can be according to the first reference position to operation
Active region installation hydroscillator is rocked on well ground, for example, can will be to the brill on operation well drill string closest to the first reference position
As the installation site of hydroscillator at knock-off joint.Waterpower can be installed to operation Jing Jingmocaqu according to the second reference position
Oscillator, for example, can by operation well drill string closest at the tool joint of the second reference position as hydroscillator
Installation site.Hydroscillator can be installed to operation well reaction torque active region according to third reference position, for example, can will be wait make
Closest to the installation site at the tool joint of third reference position as hydroscillator on industry well drill string.
In another exemplary embodiment of reduction slipping drilling frictional resistance method of the invention, as shown in Figure 1, institute
Stating, which reduces slipping drilling frictional resistance method, can comprise the following steps that
(1) hole angle size is analyzed, time t is determined, determines drill bit initial position H；
(2) drilling rod artis is divided, by tool joint labeled as calculating artis；
(3) action length for calculating surface torque and screw rod reaction torque, determines static friction area action length；
(4) drilling rod frictional resistance distribution is analyzed, and divides frictional force distributed areas；
(5) frictional resistance of each frictional force distributed areas intrinsic articulation point is calculated；
(6) slipping drilling spacing is set, such as every slipping drilling 1m repeats the above steps；
(7) artis accumulation frictional resistance analysis, determines cumulative maximum frictional resistance artis, determines best installation position
It sets.
In the present embodiment, it in step (1), determines the position of drill bit, can determine drill string length, in order to subsequent stroke
Divide the artis of drilling rod.
In the present embodiment, in step (2), artis division, drilling rod junctions ability are carried out to drilling rod from bottom to top
Hydroscillator is installed, therefore by tool joint labeled as calculating artis；
In the present embodiment, in step (3), zero is acted on downwards along drilling rod using mechanical model calculating surface torque is kept a grip on
Point and screw rod reaction torque act on zero point along drilling rod upwards, acquire surface torque action length and screw rod reaction torque action length；
Further, whole in conjunction with drilling rod using surface torque action length and screw rod reaction torque action length in step (3)
Static friction section length can be calculated in body length；
In the present embodiment, in step (4), according to slide drilling principle, there are zero for the downward sphere of action of surface torque
Point and the upward sphere of action of screw rod reaction torque are there are zero point, and the distribution of underground drill stem frictional force can divide when slipping drilling
For 3 typical sections: rocking active region, static friction area, reaction torque active region in ground.
In the present embodiment, in step (5), surface torque active region, screw rod reaction torque active region, static friction area are calculated
The frictional resistance of intrinsic articulation point need to be according to each area's frictional resistance point since the distribution of frictional resistance in each region is different
Cloth feature calculates separately each area joint using mechanics is kept a grip in conjunction with parameters such as well track, casing programme, geology, construction technologies
Point frictional resistance.
In step (6), setting slipping drilling spacing increment, such as every slipping drilling 1m, record time t, repetition step (1)~
(5), with the frictional resistance of each analysis site of this cycle calculations to designing well depth.
In step (7), the size of each artis accumulation frictional resistance is analyzed, determines cumulative maximum frictional resistance joint
Point is the best position of hydroscillator at artis maximum value.
In conclusion the prediction technique of slipping drilling overall process frictional resistance of the invention and reduction slipping drilling friction resistance
The method advantage of power can include:
Can the frictional resistance to drilling well overall process accurately analyzed；The installation of hydroscillator can effectively be instructed
And solve existing hydroscillator installation site determine with drilling experience and static calculation the technical issues of, cunning can be reduced
The drilling tool frictional resistance of dynamic drilling process, improves rate of penetration, reduces operating cost.
Although those skilled in the art should be clear above by combining exemplary embodiment to describe the present invention
Chu can carry out exemplary embodiment of the present invention each without departing from the spirit and scope defined by the claims
Kind modifications and changes.
Claims (10)
1. a kind of prediction technique of slipping drilling overall process frictional resistance, which is characterized in that the prediction technique includes following step
It is rapid:
Set the initial position of drill bit in drilling process；
The length of drill string is calculated according to the initial position, and each artis, the joint are divided according to the length of drill string
Point is at tool joint；
Ground is calculated based on the initial position and rocks action length and reaction torque action length, and will based on the calculated result
The distribution Preliminary division of drill string frictional force is three areas when slipping drilling: rocking active region, static friction area, reaction torque in ground
Active region；
Calculate the frictional resistance that can respectively enter each artis in the preliminary area Hua Housange；
The simulation slipping drilling from the initial position, every simulation slipping drilling unit distance just redefine a drill bit position
It sets, just repartitions each artis after each determining bit location, repartitions three areas and recalculate
Divide the frictional resistance of each artis in the area Hou Sange；
After simulating slipping drilling, obtain determining that bit location posterior joint point quantity is identical and corresponding each with last time
The frictional resistance set of a artis, each set contain all during simulating slipping drilling of an artis and rub
Wipe resistance.
2. the prediction technique of slipping drilling overall process frictional resistance according to claim 1, which is characterized in that the setting
The step of initial position of drill bit, includes: in drilling process
Hole angle size is analyzed, determines the time, and then determines drill bit location in the wellbore.
3. the prediction technique of slipping drilling overall process frictional resistance according to claim 1, which is characterized in that set described
Before determining drill bit initial position, the prediction technique further comprises the steps of: planning well track.
4. the prediction technique of slipping drilling overall process frictional resistance according to claim 1, which is characterized in that the calculating
Action length is rocked on ground and reaction torque action length includes:
Using keeping a grip on mechanical model and calculating surface torque zero point and screw rod reaction torque are acted on downwards along drill string act on upwards along drill string
Zero point acquires surface torque action length and screw rod reaction torque action length.
5. the prediction technique of slipping drilling overall process frictional resistance according to claim 4, which is characterized in that described to be based on
Calculated result by the distribution Preliminary division of drill string frictional force when slipping drilling be three areas the step of include:
According to the surface torque action length, screw rod reaction torque action length and drill string entire length, the static friction is determined
The length in area.
6. the prediction technique of slipping drilling overall process frictional resistance according to claim 5, which is characterized in that the calculating
The step of frictional resistance includes:
Based on basic data, the frictional resistance is calculated using tubular buckling.
7. the prediction technique of slipping drilling overall process frictional resistance according to claim 6, which is characterized in that the basis
Data include: the well track, preset construction parameter and material parameter of planning.
8. the prediction technique of slipping drilling overall process frictional resistance according to claim 1, which is characterized in that the unit
Distance is 0.5~10m.
9. the prediction technique of slipping drilling overall process frictional resistance according to claim 1, which is characterized in that the prediction
Method further comprises the steps of:
Frictional resistance in each set is divided according to the first, second, and third class, wherein first kind friction resistance
Power is that artis is in frictional resistance when active region is rocked on ground, when the second class frictional resistance is that artis is in static friction area
Frictional resistance, third class is frictional resistance when artis is in reaction torque active region；
The frictional resistance of identical type in each set is subjected to accumulation calculating, and it is tired to obtain the corresponding first kind of each artis
Product frictional resistance, the second class accumulation frictional resistance and third class accumulate frictional resistance, wherein there is no first in the set,
Second or when third class frictional resistance, corresponding frictional resistance of accumulating is calculated as 0.
10. a kind of method for reducing slipping drilling frictional resistance, which is characterized in that the described method comprises the following steps:
For to operation well, prediction technique according to claim 9 obtains the corresponding first kind accumulation of each artis and rubs
It wipes resistance, the second class accumulation frictional resistance and third class and accumulates frictional resistance；
According to sequence from big to small, using the preceding m first kind accumulate frictional force corresponding to artis as the first reference position,
m≥1；
According to sequence sequence from big to small, using artis corresponding to preceding n the second class accumulation frictional force as the second reference
Position, n >=1；
According to sequence sequence from big to small, referred to using artis corresponding to preceding s third class accumulation frictional force as third
Position, s >=1；
Passed through according to first, second, and third reference position described to install hydroscillator on drilling rod used in operation
Hydroscillator reduces the frictional resistance of drilling rod in drilling process.
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