CN103413042B - The determination methods of Sonic drill drill string critical area and very big stress joint - Google Patents
The determination methods of Sonic drill drill string critical area and very big stress joint Download PDFInfo
- Publication number
- CN103413042B CN103413042B CN201310340852.0A CN201310340852A CN103413042B CN 103413042 B CN103413042 B CN 103413042B CN 201310340852 A CN201310340852 A CN 201310340852A CN 103413042 B CN103413042 B CN 103413042B
- Authority
- CN
- China
- Prior art keywords
- drill
- drill string
- sonic
- critical area
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000013178 mathematical model Methods 0.000 claims abstract description 3
- 239000002689 soil Substances 0.000 claims description 6
- 238000013519 translation Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 210000002445 nipple Anatomy 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
The object of the present invention is to provide a kind of Sonic drill drill string critical area and the determination methods of very big stress joint.Specifically include following several basic steps：(a) the longitudinal forced vibration for establishing Sonic drill drill string simplifies mathematical model；(b) parameters such as Sonic drill drill string total length, single drill pipe length and Materials Yield Limit are given；(c) the very big stress position of Sonic drill drill string and the program calculation of critical area are carried out using related software.The present invention effectively can theoretically determine Sonic drill drill string critical area and judge the appearance position of the very big stress joint of drill string, nipple is since stress concentration is cracked or fracture during avoiding use, the present invention is conducive to improve drilling efficiency during application sonic drilling technology, and reduces harm of the acoustic frequency vibration to equipment.
Description
Technical field
The present invention relates to a kind of Sonic drill drill string critical area and the determination methods of very big stress joint, can be used for
Judge whether occur very big stress at Sonic drill drill string joints, and provide the minimum critical area of Sonic drill drill string.
Background technology
Sonic drilling (Sonic Drilling) also known as turns round sonic drilling.It utilizes dither, low speed revolution and
Pressure triplicity gets up to realize drilling.This technology is currently used primarily in environmental drilling, in soil investigation, soil exploration, placer physical prospecting, quick-fried
Holes, well construction and ground construction etc. are also widely used.
It is former to the undisturbed of soil environment with increasing sharply for domestic infrastructure engineering and construction of engineering environment protection
Shape sampling is increasingly paid attention to be subject to industry, has promoted application of the sonic drilling technical equipment in China basis prospecting industry, but
The systems theory research of the rarely seen sonic drilling technology published both at home and abroad.Sonic drill vibrator vibration frequency is usually 50-
150Hz, when the vibration frequency of vibrator and the identical natural resonance frequency of drill string, will resonate, great energy
Drill bit is passed to, realizes and creeps at a high speed.Meanwhile drill string keeps resonance state under high-frequency excitation power, and pole can be produced inside drill string
Big alternate stress, makes drilling rod crack or even be broken, reduces Life of drill rod.
In order to ensure the safety of sonic drilling drill string, we have proposed a kind of Sonic drill drill string critical area and connector to occur
The determination methods of very big stress.Drilling rod critical area can be determined during Sonic drill design of drill, and judges that drill string is very big
The appearance position of stress joint, nipple is conducive to since stress concentration is cracked or fracture during avoiding use
Drilling efficiency is improved during using sonic drilling technology, and reduces harm of the acoustic frequency vibration to equipment.
The content of the invention
The object of the present invention is to provide a kind of Sonic drill drill string critical area and the determination methods of very big stress joint.This hair
It is bright effectively theoretically to determine the critical area of Sonic drill drill string and judge whether drill rod threaded nipple occurs greatly should
Power, utility theory instruct Sonic drill drilling rod to design, it is ensured that drilling rod critical area simultaneously predicts that position occurs in greatly stress inside drill string
Put, Sonic drill drill string safety in utilization and fatigue life can be improved using the present invention.
Technical scheme approximately as：
Including following several basic steps：(a) the longitudinal forced vibration for establishing Sonic drill drill string simplifies mathematical model；(b)
The parameters such as given Sonic drill drill string total length, single drill pipe length and Materials Yield Limit；(c) sound wave is carried out using related software
Bore the very big stress position of drill string and the program calculation of critical area.The present invention effectively can theoretically determine Sonic drill drill string
Whether critical area there is very big stress with tool joint, has the function that theoretical direction design and production and construction.
In such scheme, concrete operations are as follows：
(a) beformable body drill string upper end can regard it as mobile hinge along mast guide rail translation gliding in Sonic drill drilling process
The drill bit of branch, drill string and its lower end is subject to the viscous fluid boundary constraint of liquefaction of soil mass weaker, is considered as free end or translation
It is secondary；
Introducing has screening property δ functions, by the exciting force F (t) of top acoustic frequency vibration device=meω2Sin ω t are changed into being distributed
The form of power, meets：
Formula (1)
In formula (1)：X is distributed force place section away from the distance that fixed point is pushed up on drill string, unit (n)；T is the time, unit
(s)；meFor the total static moment of acoustic frequency vibration device eccentric mass, unit is (kg*m)；ω is exciting force angular frequency, and unit is radian per second；
Cross-section sound wave drill string genesis analysis load f (x, t) effect under the extensional vibration differential equation be
Formula (2)
In formula (2)：U (x, t) be drill string on away from section at the x of vertex moment t length travel；L is drill string length, unit
For (m)：S is drill string sectional area, and unit is (m2)；ρ is density of material, and unit is (kg/m3)；E is elasticity modulus, and unit is
(Pa)；
According to Sonic drill drill string specific border condition, the displacement of Sonic drill drill stem stabilization vibration is solved using the separation of variable
Field such as following formula
Formula (3)
In formula (3)：I=0,1,2 ... respectively there is frequency for each rank of drill string；ξiFor each rank damping of drill string
Than：For each rank vibration phase angle of drill string；
So as to obtain the critical area S that dynamic stress flexing does not occur for drill stringcrCriterion is as follows：
Formula (4)
In formula (4)：σsFor drill string Materials Yield Limit；When reaching resonance due to drill string, maximum moving stress master inside drill string
Will by resonate i-thrWhat rank Mode Shape component determined, critical areaIt can be seen that critical area is to damping
Size it is very sensitive, almost with proportional damping ξiIn viscous damping coefficient β be inversely proportional.
There is the criterion of very big stress in Sonic drill drill string thread connector：
Formula (5)
In formula (5)：M is drilling rod radical；lrodFor single drill pipe length；F is excitation force frequency；
(b) after given relevant parameter, very big stress whether occurs at critical area and drill string joints during design of drill
Then judgement can be identified according to formula (4) and formula (5) respectively.
Determination methods of the present invention, when designing Sonic drill drilling rod, can provide drilling rod critical area rapidly, instruct drill string to set
Meter；And can judge whether very big alternate stress can be produced at tool joint in the Sonic drill course of work, it is ensured that Sonic drill
The security used.
Embodiment
Below in conjunction with the accompanying drawings and example the present invention is further described.
1st, DZ50 steel alloys are used as drill rod materials, its yield limit σs=500Mpa, density p=7850kg/m3, elasticity
Modulus E=2.06el1Pa.
2nd, it is 48m, the long l of every drilling rod to take drill string lengthrod=3m.
3rd, Sonic drill drilling string dynamics analysis simplified model is established, beformable body drill string upper end can edge in Sonic drill drilling process
Mast guide rail translation gliding, regards it as mobile hinged, the drill bit of drill string and its lower end is subject to the viscous fluid side of liquefaction of soil mass
Bound constrained is weaker, is considered as free end or translation pair, simplified model such as attached drawing 1.
4th, according to above-mentioned selected drill rod materials parameter and drill string length, and formula (4) is carried out using MATLAB softwares
Program calculation drilling rod critical area Scr。
48m long drill strings respectively reach the resonance of the 1st, 2,3 rank in excited frequency f=53.36,106.72,160.08Hz.Will
lrod, E, ρ, f brings formula (4) into, can obtain i respectivelyrWhen=1, at the 8th when n=1, m=8 meet formula (5), i.e. first order resonant
There is maximum stress connector in the bottom of drilling rod；irWhen=2, n=1, m=4 or n=2, m=12 meet formula (5), i.e., second order is total to
When shaking, there is maximum stress connector in the 4th and the 12nd drilling rod bottom；Similarly irWhen=3, maximum stress connector appears in the 8th
Root drilling rod bottom.Obtained result with before 48m long Sonic drills drill string shown in attached drawing 2 during third order resonance inside maximum stress figure obtain
Result it is consistent.
5th, determination methods of the present invention, when designing Sonic drill drilling rod, can provide drilling rod critical area rapidly, instruct drill string to set
Meter；And can judge whether very big alternate stress can be produced at tool joint in the Sonic drill course of work, it is ensured that Sonic drill
The security used.
Brief description of the drawings
Fig. 1 Sonic drill drill string schematic diagrams；
Inside maximum stress figure during third order resonance before Fig. 2 48m long Sonic drill drill strings.
Claims (1)
1. the determination methods of a kind of Sonic drill drill string critical area and very big stress joint, it is characterised in that comprise the following steps：
(a) the longitudinal forced vibration for establishing Sonic drill drill string simplifies mathematical model；
(b) Sonic drill drill string total length, single drill pipe length and Materials Yield Limit parameter are given；
(c) the very big stress position of Sonic drill drill string and the program calculation of critical area are carried out；
The calculating specifically comprises the following steps：
(1) in Sonic drill drilling process beformable body drill string upper end along mast guide rail translation gliding, regard it as it is mobile hinged, drill string and
The drill bit of its lower end is subject to the viscous fluid boundary constraint of liquefaction of soil mass weaker, regards it as free end or translation pair；
The δ functions with screening property are introduced, by the exciting force F (t) of top acoustic frequency vibration device=meω2Sin ω t are changed into dividing as follows
Cloth power form：
In formula：X is distributed force place section away from the distance that fixed point is pushed up on drill string, unit (m)；T is the time, unit (s)；meFor sound
The total static moment of frequency vibration device eccentric mass, unit (kg*m)；ω is exciting force angular frequency, unit (radian per second)；
F (x, t) is genesis analysis load；
Cross-section sound wave drill string genesis analysis load f (x, t) effect under the extensional vibration differential equation be
In formula：
U is Sonic drill drill string displacement field, and expression is u (x, t), is meant on drill string away from section at the x of vertex in the vertical of moment t
To displacement；
S is drill string sectional area, and unit is (m2)；ρ is density of material, and unit is (kg/m3)；E is elasticity modulus, and unit is (Pa)；
Sonic drill drill string displacement field is obtained using the separation of variable according to Sonic drill drill string boundary condition：
In formula：
L is drill string length, and unit is (m)；
For each rank modal frequency of drill string；
ζiFor the damping ratio of each first order mode of drill string；
For each rank vibration phase angle of drill string；
So as to obtain the critical area S that dynamic stress flexing does not occur for drill stringcrCriterion is as follows：
In formula：σsFor the Materials Yield Limit of drill string；
There is the criterion of very big stress in Sonic drill drill string joints：
In formula：M is drilling rod radical；lrodFor single drill pipe length；F is excitation force frequency；irThe exponent number for the vibration shape that resonates for drill string；
(2) relevant parameter is given, calculating S is carried out using MATLAB programming softwarescr, Sonic drill drill string is obtained in design critical surface
Product；For given drilling rod radical m, single drill pipe length lrod, whether excitation force frequency f, then can determine whether to go out at tool joint
Now very big stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310340852.0A CN103413042B (en) | 2013-08-07 | 2013-08-07 | The determination methods of Sonic drill drill string critical area and very big stress joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310340852.0A CN103413042B (en) | 2013-08-07 | 2013-08-07 | The determination methods of Sonic drill drill string critical area and very big stress joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103413042A CN103413042A (en) | 2013-11-27 |
| CN103413042B true CN103413042B (en) | 2018-04-17 |
Family
ID=49606053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310340852.0A Expired - Fee Related CN103413042B (en) | 2013-08-07 | 2013-08-07 | The determination methods of Sonic drill drill string critical area and very big stress joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103413042B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967428B (en) * | 2014-04-18 | 2016-01-13 | 上海大学 | A kind of evaluation method of drill string fatigue failure risk |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101424182A (en) * | 2008-12-12 | 2009-05-06 | 清华大学 | Dynamic force multi-parameter measuring systems for rotary simulation of bottom drill string |
| CN103164580A (en) * | 2013-03-14 | 2013-06-19 | 中国石油天然气股份有限公司 | Method of evaluating drill column dynamic safety |
-
2013
- 2013-08-07 CN CN201310340852.0A patent/CN103413042B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101424182A (en) * | 2008-12-12 | 2009-05-06 | 清华大学 | Dynamic force multi-parameter measuring systems for rotary simulation of bottom drill string |
| CN103164580A (en) * | 2013-03-14 | 2013-06-19 | 中国石油天然气股份有限公司 | Method of evaluating drill column dynamic safety |
Non-Patent Citations (3)
| Title |
|---|
| 冲旋钻井中钻柱纵向振动模型的建立与求解方法;袁光杰等;《石油钻探技术》;20021031;第30卷(第5期);第20-22页 * |
| 深孔钻机离合器接合过程动力学特性分析;伍亦文等;《中国机械工程》;20121231;第23卷(第12期);第1433-1437页 * |
| 钻柱纵向振动分析与应用;王文龙等;《振动与冲击》;20111231;第30卷(第6期);第229-234页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103413042A (en) | 2013-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xu et al. | Mechanism and application of pulse hydraulic fracturing in improving drainage of coalbed methane | |
| CN104715161B (en) | A kind of goaf top plate Convenient stable criterion | |
| Li et al. | Numerical simulation of 3D hydraulic fracturing based on an improved flow-stress-damage model and a parallel FEM technique | |
| Yao et al. | Numerical simulation on the risk of roof water inrush in Wuyang Coal Mine | |
| CN105401935B (en) | A kind of drilling well the pressure of the drill computational methods, device and the pressure of the drill instruction equipment | |
| CN103353382A (en) | Analyzing method for parametric-excitation and vortex-induced vibratory fatigue of deep-ocean top tension riser | |
| Wu et al. | The numerical research on rock breaking and rising mechanism of rotary-percussive drilling | |
| Sun et al. | The transient impact of the resonant flexible drill string of a sonic drill on rock | |
| Wang et al. | A new method to evaluate the brittleness for brittle rock using crack initiation stress level from uniaxial stress–strain curves | |
| CN103413042B (en) | The determination methods of Sonic drill drill string critical area and very big stress joint | |
| CN104537195B (en) | A kind of deep rock mass Blasting Excavation induced vibration forecasting procedure based on energy principle | |
| CN211401722U (en) | Soil sampling device is used in geology reconnaissance | |
| CN107167338A (en) | Great burying soil sampling apparatus and system based on ultrasonic wave | |
| CN107059958A (en) | The detecting system and method for prestress wire anchorage cable stretching power | |
| Wang et al. | Design of a sonic drill based on virtual prototype technology | |
| Lizunov et al. | The stability of rotating rods under the action of vibro-impact load | |
| Li et al. | 3D analysis on surrounding soil stability of shaft boring machine based on plastic limit equilibrium theory | |
| Liu et al. | Stability of tunnel face reinforced by bolts under seepage flow conditions | |
| CN207850741U (en) | A kind of geological and mineral exploration sampler | |
| Liu et al. | Study of influences of rock hardness on crack evolution rule under hydraulic fracturing | |
| Bu et al. | Research on flexible drill string vibration induced by sonic harmonic excitation | |
| Bruno | Fundamental research on percussion drilling: improved rock mechanics analysis, advanced simulation technology, and full-scale laboratory investigations | |
| CN214463857U (en) | Pneumatic drilling machine for geological exploration hydraulic engineering | |
| CN209858250U (en) | Portable deep soil sampler | |
| CN104314474B (en) | Transmission line of electricity rock-bolt small-sized drill Multifunctional triangle type leg |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180417 |