CN105825028B - A kind of computational methods of oil-well rig hook load - Google Patents
A kind of computational methods of oil-well rig hook load Download PDFInfo
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- CN105825028B CN105825028B CN201610195698.6A CN201610195698A CN105825028B CN 105825028 B CN105825028 B CN 105825028B CN 201610195698 A CN201610195698 A CN 201610195698A CN 105825028 B CN105825028 B CN 105825028B
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- G06F30/17—Mechanical parametric or variational design
Abstract
The invention discloses a kind of computational methods of oil-well rig hook load, include the following steps：A. the total level displacement into well casing column bottom is sought；B. vertical caused active force is sought；C. active force caused by level is sought；D. hook load is calculated.The present invention realizes a kind of method for predicting oil-well rig hook load, by borehole track or advises the known conditions such as mark, the characterisitic parameter for entering well casing column, it is ensured that the reliability of result of calculation；Pass through empirical model and model conversion factor, it is ensured that the precision of data result of calculation；Help is provided for engineers and technicians' drilling machine type selecting and wellbore construction security evaluation.
Description
Technical field
The present invention relates to Oil-Gas Well Engineering field, especially a kind of computational methods of oil-well rig hook load.
Background technology
Hook load refers to the axial force that hook is born.It is drilling machine type selecting and coordinative composition of equipments important foundation data it
One, and carry out one of the important evidence of wellbore construction security evaluation.Therefore, it is very heavy that hook load is effectively predicted when drilling well
It wants.During drilling well, completion and processing complex accident etc., the load that hook is born includes drilling machine hoisting system and tubing string
Dead weight, the buoyancy of drilling fluid effect, curved portion bending force, borehole wall effect frictional resistance and be hampered card activity when impact force etc.
Many kinds of force.Wherein, bending force, frictional resistance and impact force's calculation are relatively complicated.
At present, existing petroleum industry proposed standard SY/T 5724-2008《Casing string Structure ＆ Intensity design》It is special with disclosure
It writes《Oil/gas well tubular buckling and engineering》(publishing house of China University Of Petroleum Beijing, in October, 2006 publish) discloses straight well, two-dimentional well
The Axial Force Calculating model of eye and three-dimensional wellbore, is divided into N number of infinitesimal section, according to the balance of dead load by borehole track or track
Principle and different mathematical models carry out recurrence calculation and go out axial force of the different tubing strings under different operating modes.This computational methods,
Minute cells calculating is carried out according to different well tracks and pipe string combination and is superimposed solution, and reliability is high, obtains drilling well industry
Technical staff approves.Shortcoming is computation model complexity, and calculating process is cumbersome, needs to be tied by professional software
Fruit is unfavorable for well drilling operation site use.
Invention content
The purpose of the present invention is to provide a kind of computational methods of oil-well rig hook load, in terms of solving to use at present
Calculate the problems such as model is complicated, calculating process is cumbersome.
The present invention solve its technical problem the technical solution adopted is that：A kind of computational methods of oil-well rig hook load,
It includes the following steps：
A. the quantity of crucial well depth point is determined according to borehole track or track；
B. the master data of calculating is obtained；
C. vertical caused active force T is soughtv, unit is ox；Calculation formula is：
In formula：J is vertical fragmentation variable, dimensionless；qejFor the vertical tubing string unit length effective weight of jth section, unit is
N/m；ΔHvjFor jth section wellbore vertical increment, unit is rice；
D. active force T caused by level is soughth, unit is ox；It is divided into following sub-step：
1., seek total level displacement H into well casing column bottomh, unit is rice；Calculation formula is：
In formula：I is that well depth is segmented variable, dimensionless；NiFor i-th point of northern coordinate, Ni-1For (i-1)-th point of northern coordinate, Ei
For the eastern coordinate of i points, Ei-1For (i-1)-th point of eastern coordinate, unit is rice；
2., seek active force T caused by levelh, unit is ox；Calculation formula is：
In formula：λ is model conversion factor, dimensionless；K is horizontal fragmentation variable, μkFor the kth section coefficient of friction resistance, dimensionless；
qekFor the horizontal tubing string unit length effective weight of kth section, unit N/m；HhkFor kth section horizontal displacement length, unit is rice；
E. hook load T is calculated, unit is ox；Calculation formula is：
T=Tv±Th
The occupation mode of symbol " ± " in formula：When upper lifting pipe post, "+" number is used；When transferring tubing string or drilling, use
“-”；When tubing string is static, active force T caused by levelhTake zero calculating.
In the step c, the coboundary m of vertical fragmentation variable j is the difference shown in vertical direction by entering well casing string
The quantity of unit weight determines.
In the step c, vertical tubing string unit length effective weight qejIt is to be sought according to following formula：
In formula：qsjFor the aerial unit weight of jth section tubing string, unit kg/m；ρdIt is single for drilling fluid density
Position is g/cm3；ρsFor tubing string Pipes Density, unit g/cm3；
The aerial unit weight q of tubing stringsjIt is to be determined according to the tubular string characteristics parameter in drill assembly parameter；
Drilling fluid density ρdIt is to be determined according to engineering design or scene actual use drilling fluid density；
Tubing string Pipes Density ρsIt is to be determined according to the characterisitic parameter of tubing string.
In the step c, wellbore vertical depth increment Delta HvjIt is vertical deep in borehole track or track correspondence according to well casing string is entered
Degree determines.
In the rapid d, the coboundary n that well depth is segmented variable i is the key that according to borehole track or track well depth points amount
The determination that subtracts 1.
In the rapid d, the coboundary p of horizontal fragmentation variable k is shown according to well casing string is entered in wellbore horizontal direction
Different unit weights determine.
In the step d, model conversion factor λ is to return a certain numerical value sought or recommend in 1.6-2.0；
In the step d, horizontal tubing string unit length effective weight qekIt is to be sought according to following formula：
In formula：qskFor the aerial unit weight of kth section tubing string, unit kg/m；ρdIt is single for drilling fluid density
Position is g/cm3；ρsFor tubing string Pipes Density, unit g/cm3；
The aerial unit weight q of tubing stringskIt is to be determined according to the tubular string characteristics parameter in drill assembly parameter；
Drilling fluid density ρdIt is to be determined according to engineering design or scene actual use drilling fluid density；
Tubing string Pipes Density ρsIt is to be determined according to the characterisitic parameter of tubing string.
The beneficial effects of the invention are as follows：The present invention is by using borehole track or track, the characterisitic parameter etc. for entering well casing column
Condition data, it is ensured that the reliability of result of calculation；By using model conversion factor, it is ensured that the essence of data result of calculation
Degree；Can meet the needs of petroleum industry engineers and technicians' drilling machine type selecting and wellbore construction security evaluation, the meter according to the invention
Calculation method, which makes calculator calculating, can seek hook load.
Specific implementation mode
Embodiment 1
Any one wellbore has two parameters of vertical well depth and horizontal displacement, enters the tubing string of well mainly by drilling rod, exacerbation
The well drilling pipe columns such as drilling rod and drill collar or casing string are constituted；Hook load is based on data above as main known conditions, according to hair
Bright model calculates separately out vertical, horizontal caused active force, the folded hook load sought under different operating modes that adds deduct.
It includes the following steps：
A. the quantity of crucial well depth point is determined according to borehole track or track；
B. the master data of calculating is obtained；
C. vertical caused active force T is soughtv, unit is ox；Calculation formula is：
In formula：J is vertical fragmentation variable, dimensionless；qejFor the vertical tubing string unit length effective weight of jth section, unit is
N/m；ΔHvjFor jth section wellbore vertical increment, unit is rice；
D. active force T caused by level is soughth, unit is ox；It is divided into following sub-step：
1, the total level displacement H into well casing column bottom is soughth, unit is rice；Calculation formula is：
In formula：I is that well depth is segmented variable, dimensionless；NiFor i-th point of northern coordinate, Ni-1For (i-1)-th point of northern coordinate, Ei
For the eastern coordinate of i points, Ei-1For (i-1)-th point of eastern coordinate, unit is rice；
2, active force T caused by level is soughth, unit is ox；Calculation formula is：
In formula：λ is model conversion factor, dimensionless；K is horizontal fragmentation variable, μkFor the kth section coefficient of friction resistance, dimensionless；
qekFor the horizontal tubing string unit length effective weight of kth section, unit N/m；HhkFor kth section horizontal displacement length, unit is rice；
E. hook load T is calculated, unit is ox；Calculation formula is：
T=Tv±Th
The occupation mode of symbol " ± " in formula：When upper lifting pipe post, "+" number is used；When transferring tubing string or drilling, use
“-”；When tubing string is static, active force T caused by levelhTake zero calculating.
The present invention is by using the condition datas such as borehole track or track, the characterisitic parameter for entering well casing column, it is ensured that calculates
As a result reliability；By using model conversion factor, it is ensured that the precision of data result of calculation；Petroleum industry engineering can be met
The demand of technical staff's drilling machine type selecting and wellbore construction security evaluation, the computational methods according to the invention make calculator calculating and are
It can seek hook load.
Embodiment 2
In the step b, the calculating master data of acquisition:Finishing drilling well depth, vertical depth, casing programme (including are opened time, wellbore ruler
Very little, well depth, sleeve outer and lower depth), borehole track or data (including depth measurement, vertical depth, hole angle, azimuth, northern coordinate, east
Coordinate, rate of over-all angle change), drill assembly parameter (including drilling tool title, outer diameter, joint length, unit weight, quantity, length
Degree), use drilling fluid density system title, density；
In the step c, the coboundary m of vertical fragmentation variable j is the difference shown in vertical direction by entering well casing string
The quantity of unit weight determines.For example, it is+21 φ 127mm of 18 φ 88.9mm drilling rods to enter in well casing string vertical direction
+ 36 φ 127mm drilling rods of heavy weight drill pipe, unit weight is respectively 19.80,75.27,32.62kg/m, then vertical fragmentation
The coboundary m of variable j is 3；
In the step c, vertical tubing string unit length effective weight qejIt is to be sought according to following formula：
In formula：qsjFor the aerial unit weight of jth section tubing string, unit kg/m；ρdIt is single for drilling fluid density
Position is g/cm3；ρsFor tubing string Pipes Density, unit g/cm3；
The aerial unit weight q of tubing stringsjIt is to be determined according to the tubular string characteristics parameter in drill assembly parameter；
Drilling fluid density ρdIt is to be determined according to engineering design or scene actual use drilling fluid density；
Tubing string Pipes Density ρsIt is to be determined according to the characterisitic parameter of tubing string, such as the density of steel is 7.85g/cm3；
In the step c, wellbore vertical depth increment Delta HvjIt is vertical deep in borehole track or track correspondence according to well casing string is entered
Degree determines.
Embodiment 3
In the rapid d, the coboundary n that well depth is segmented variable i is the key that according to borehole track or track well depth points amount
The determination that subtracts 1.Such as certain well borehole track key well depth points amount is 8, then n values in coboundary are 7；
In the rapid d, the coboundary p of horizontal fragmentation variable k is shown according to well casing string is entered in wellbore horizontal direction
Different unit weights determine.For example, certain well 324m total level displacements HhDrilling tool pipe string be 3+9, φ 88.9mm drilling rods
+ 24 φ 127mm drilling rods of φ 127mm heavy weight drill pipes, unit weight is respectively 19.80,75.27,32.62kg/m, it is single
Root φ 88.9mm drilling rods, φ 127mm heavy weight drill pipes, φ 127mm drilling rods length be 9m, then horizontal fragmentation variable p is 3, always
Horizontal displacement HhThe segment length of division is 27m, 81m, 216m respectively；
In the step d, model conversion factor λ is to return a certain numerical value sought or recommend in 1.6-2.0；
In the step d, coefficient of friction resistance μkIt is to be sought according to the reference value determination or recurrence of table 1；
1 coefficient of friction resistance experience value of table
In the step d, horizontal tubing string unit length effective weight qekIt is to be sought according to following formula：
In formula：qskFor the aerial unit weight of kth section tubing string, unit kg/m；ρdIt is single for drilling fluid density
Position is g/cm3；ρsFor tubing string Pipes Density, unit g/cm3；
The aerial unit weight q of tubing stringskIt is to be determined according to the tubular string characteristics parameter in drill assembly parameter；
Drilling fluid density ρdIt is to be determined according to engineering design or scene actual use drilling fluid density；
Tubing string Pipes Density ρsIt is to be determined according to the characterisitic parameter of tubing string, such as the density of steel is 7.85g/cm3；
Embodiment 4
The present embodiment calculates the big structure load of oil-well rig according to a bite Horizontal Well A data, makees to the present invention further
Description：
A. determine that the quantity of crucial well depth point is 6 according to well A tracks；
B. the master data of calculating is obtained：
(1) well A casing programmes data are as shown in table 2, wellbore finishing drilling well depth：4443.00m vertical depth：3461.00m.
2 well A casing programme tables of data of table
(2) well A borehole tracks tables of data is as shown in table 3.
3 borehole track tables of data of table
(3) two when well A is drilled into 4443.00m open drill assembly and drilling tool characteristic parameter data is as shown in table 4.
4 drill assembly of table and drilling tool characterisitic parameter
C. vertical caused active force T is calculatedv:
Calculation formula is：
In formula：Due to entering well casing string two kinds of heavy weight drill pipe and drilling rod are showed in vertical direction.Therefore, vertical fragmentation variable j
Coboundary m be 2, the vertical tubing string of paragraph 1 be outer diameter 127.00mm heavy weight drill pipe, unit weight qs1For 75.27kg/m,
Wellbore vertical depth increment Delta Hv1It is 334.80m (36 drilling rods, joint length 9.30m)；2nd section of vertical tubing string is outer diameter 127.00mm
Drilling rod, unit weight qs1For 32.62kg/m, wellbore vertical depth increment Delta Hv2It is 3126.20m (vertical depth 3461.00m and
The difference of 1 section of wellbore vertical depth increment 334.80m)；Drilling fluid density ρdFor 1.25g/cm3, tubing string Pipes Density ρsFor 7.85g/
cm3.Then
9.81×(1-1.25÷7.85)×(75.27×334.80+32.62×3126.20)
=1048943.00N
D. active force T caused by calculated levelh:
The first step：Seek the total level displacement H into well drill string bottomh。
Calculation formula is：
In formula：The coboundary n that well depth is segmented variable i is 5；1st point of northern coordinate N0For 0m, eastern coordinate E0For 0m；2nd point
Northern coordinate N1For 0m, eastern coordinate E1For 0m；3rd point of northern coordinate N2For 62.89m, eastern coordinate E2For -21.35m；4th point
Northern coordinate N4For 83.59m, eastern coordinate E4For -28.38m；5th point of northern coordinate N4For 434.00m, eastern coordinate E4For-
147.00m；6th point of northern coordinate N5For 1125.66m, eastern coordinate E5For -380.48m.Then
Second step：Seek active force T caused by levelh.Calculation formula is：
In formula：Model conversion factor λ takes 1.85；Drilling fluid density ρdFor 1.25g/cm3, tubing string Pipes Density ρsFor
7.85g/cm3；Drilling fluid system is polymer water base class, and tabling look-up known to 1, the coefficient of friction resistance takes 0.2 in casing, Open-Hole Section frictional resistance system
Number takes 0.3, and model conversion factor takes 1.85.Non magnetic drill collar, heavy weight drill pipe and drilling rod 3 are showed in the horizontal direction due to entering well casing string
Kind.Therefore, the coboundary p of horizontal fragmentation variable k is 3.The horizontal tubing string of paragraph 1 is non magnetic drill collar, coefficient of friction resistance μ1It is 0.3, it is single
Bit length weight qs1For 149.11kg/m, horizontal displacement length Hh1For 9.15m (1 drill collar, joint length 9.15m)；2nd section
Horizontal tubing string is heavy weight drill pipe, coefficient of friction resistance μ2It is 0.3, unit weight qs1For 75.27kg/m, horizontal displacement length Hh2For
83.70m (9 heavy weight drill pipes, joint length 9.30m)；3rd section of horizontal tubing string is drilling rod, coefficient of friction resistance μ3It is 0.3, unit is long
Spend weight qs1For 32.62kg/m, horizontal displacement length Hh2For 1095.37m (total level displacement 1188.22m and the 1st, 2 sections of wellbores
Horizontal displacement length 9.15, the difference of 83.70m).Then
9.81×1.85×(1-1.25÷7.85)
×(0.3×149.11×9.15+0.3×75.27×83.7
+0.3×32.62×1095.37)
=198646.20N
E. hook load T when carrying drilling tool is calculated.Calculation formula is：
T=Tv+Th
Active force T caused by verticalvFor 1048943.00N, it is horizontal caused by active force ThFor 198646.20N.Then
1048943.00+198646.20=1247589.20N=1247.59kN
The error analysis of result of calculation：
It is 1201.45kN, relative error about 3.84% using the result that current Large-scale professional software calculates；Actual well drilled is existing
Field weight indicator monitoring data are 1222.00kN, relative error about 2.09%.
Claims (8)
1. a kind of computational methods of oil-well rig hook load, it includes the following steps：
A. the quantity of crucial well depth point is determined according to borehole track or track；
B. the master data of calculating is obtained；
C. vertical caused active force T is soughtv, unit is ox；Calculation formula is：
In formula：J is vertical fragmentation variable, dimensionless；qejFor the vertical tubing string unit length effective weight of jth section, unit N/m；
ΔHvjFor jth section wellbore vertical increment, unit is rice；M is the coboundary of vertical fragmentation variable j；
D. active force T caused by level is soughth, unit is ox；It is divided into following sub-step：
1., seek total level displacement H into well casing column bottomh, unit is rice；Calculation formula is：
In formula：I is that well depth is segmented variable, dimensionless；NiFor i-th point of northern coordinate, Ni-1For (i-1)-th point of northern coordinate, EiFor i points
Eastern coordinate, Ei-1For (i-1)-th point of eastern coordinate, unit is rice；N is the coboundary that well depth is segmented variable i；
2., seek active force T caused by levelh, unit is ox；Calculation formula is：
In formula：λ is model conversion factor, dimensionless；K is horizontal fragmentation variable, μkFor the kth section coefficient of friction resistance, dimensionless；qekFor
The horizontal tubing string unit length effective weight of kth section, unit N/m；HhkFor kth section horizontal displacement length, unit is rice；P is water
Divide the coboundary of segment variable k equally；
E. hook load T is calculated, unit is ox；Calculation formula is：
T=Tv±Th
In formula：When upper lifting pipe post, "+" number is used；When transferring tubing string or drilling, "-" is used；It is horizontal when tubing string is static
Caused active force ThTake zero calculating.
2. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step c,
The coboundary m of vertical fragmentation variable j is that the quantity of the different unit weights shown in vertical direction by entering well casing string is true
It is fixed.
3. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step c,
Vertical tubing string unit length effective weight qejIt is to be sought according to following formula：
In formula：qsjFor the aerial unit weight of jth section tubing string, unit kg/m；ρdFor drilling fluid density, unit is
g/cm3；ρsFor tubing string Pipes Density, unit is gram g/cm per cubic centimeter3；
The aerial unit weight q of tubing stringsjIt is to be determined according to the tubular string characteristics parameter in drill assembly parameter；
Drilling fluid density ρdIt is to be determined according to engineering design or scene actual use drilling fluid density；
Tubing string Pipes Density ρsIt is to be determined according to the characterisitic parameter of tubing string.
4. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step c,
Jth section wellbore vertical increment Δ HvjBe according to enter well casing string borehole track or track corresponds to vertical depth determination.
5. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step d,
The coboundary n of well depth segmentation variable i is the key that according to the determination that subtracts 1 of borehole track or track well depth points amount.
6. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step d,
The coboundary p of horizontal fragmentation variable k is true according to the different unit weights that well casing string is shown in wellbore horizontal direction are entered
It is fixed.
7. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step d,
Model conversion factor λ is to return to seek or reference value 1.6-2.0.
8. a kind of computational methods of oil-well rig hook load according to claim 1, it is characterized in that：In the step d,
Horizontal tubing string unit length effective weight qekIt is to be sought according to following formula：
In formula：qskFor the aerial unit weight of kth section tubing string, unit kg/m；ρdFor drilling fluid density, unit is
g/cm3；ρsFor tubing string Pipes Density, unit is gram g/cm per cubic centimeter3；
The aerial unit weight q of tubing stringskIt is to be determined according to the tubular string characteristics parameter in drill assembly parameter；
Drilling fluid density ρdIt is to be determined according to engineering design or scene actual use drilling fluid density；
Tubing string Pipes Density ρsIt is to be determined according to the characterisitic parameter of tubing string.
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| CN102589869A (en) * | 2012-03-06 | 2012-07-18 | 中国石油天然气股份有限公司 | Estimating method and estimating device for loading capacity of working derrick |
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| CN102589869A (en) * | 2012-03-06 | 2012-07-18 | 中国石油天然气股份有限公司 | Estimating method and estimating device for loading capacity of working derrick |
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| Study on multi-segment friction factors inversion in extended-reach well based on an enhanced PSO model;Pengju Chen 等;《Journal of Natural Gas Science and Engineering》;20151130;第27卷(第3期);1780-1787 * |
| 大位移井套管柱强度设计研究;龚龙祥;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20080715(第7期);25-30 * |
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