CN1967202A - Petroleum drilling pipe shocking and sliding wear tester - Google Patents
Petroleum drilling pipe shocking and sliding wear tester Download PDFInfo
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- CN1967202A CN1967202A CNA2005101232609A CN200510123260A CN1967202A CN 1967202 A CN1967202 A CN 1967202A CN A2005101232609 A CNA2005101232609 A CN A2005101232609A CN 200510123260 A CN200510123260 A CN 200510123260A CN 1967202 A CN1967202 A CN 1967202A
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Abstract
The invention discloses an oil drilling rod shock slide abrasion tester, including the fixture system, the transmission system and the excitation system, in which the said fixture system clamping fixes the tubular specimen, and the one end of the said transmission system equips the rod specimen corresponding to the tubular specimen, and the said transmission system drives the rod specimen rotating with the axis, and the said excitation system provides radial shock to the said rod specimen, to drive the rod specimen shocks the tubular specimen fixed in the fixture system at the same time of rotating, to realize the composite shock slide friction, and through the friction, transmit the torque to the rod specimen. The invention overcomes the limitation of the existing abrasion testers, and it can realize rod friction and abrasion study of shock slide composite working conditions of controlled shock load type under the condition of multiphase cycle lubricating medium, and it can not only realize multiphase media cycle of adjustable flow and variable components, but also realize the complex impact of adjustable shock size, controllable wave-type.
Description
Technical field
The present invention relates to a kind of tribology test unit, wear condition between main simulation Process of Oil Well Drilling middle-deep well section drill pipe sub and the sleeve pipe, drill pipe sub is the cylindric rod member of rigidity, sleeve pipe is the round steel pipe that certain wall thickness is arranged, in drilling process drilling rod inside pipe casing in the axle center rotation of oneself in the impact that radially takes place internal surface of sleeve pipe.This testing machine is in order to this relative motion between simulation drilling rod and sleeve pipe, for sleeve pipe and the drill rod abrasion of research under this working condition provides means.This testing machine also can be used for simulating the tribology system of other analogues in addition, especially impacts the wear test under slide compound working condition or the medium situation in the tribology test field.
Background technology
Be used to estimate oil drill rocker and shell material abrasion test means under compound working condition of impact-slip or the medium situation at present, mainly contain the reciprocal impact wear testing machine that utilizes the pin dish testing machine, cam or the crank-driven that are added with vibrating device, pulsatile impact abrasion tester and the various lubrication test instrument that fork loads.
(1) pin dish testing machine principle and characteristics
Pin dish testing machine is that the disk test specimen of pressing close to a rotation after utilizing a static pin shape test specimen to pressurize is realized material friction and polishing machine are measured.This testing machine becomes a kind of tribology test method that the most generally adopts because of simple.By the small vibration wear test under the lubricant medium situation also can be arranged after improving.Because of testing machine small-sized, so sample dimensions is very little, impulsive force is little, can not the Simulation of Complex working condition tests.
(2) reciprocal impact wear testing machine
Back and forth impact wear testing machine is by the driven by motor crankshaft rotating, thereby realizes the to-and-fro movement of first test specimen at the second test specimen inner chamber.This testing machine can be simulated the relative motion between piston-cylinder preferably, can not simulate other friction system more widely.The testing machine deficiency is no medium circulation, and simulated condition is simple, narrow application range.
(3) pulsatile impact abrasion tester
The pulsatile impact abrasion tester uses eccentric stiffener to produce exciting force, is sent on the rotation test specimen by lever, can realize bigger impulsive force, can not adjust but impulse form is single, does not have lubricant medium.
(4) Maurer company casing tube abrasion testing machine
As shown in Figure 5, Maurer company has developed a kind of testing machine at the wearing and tearing of drilling rod and sleeve pipe specially, tool-joint sample 1 ' is rotated by a direct motor drive, thereby being installed in, sleeve pipe sample 2 ' can do the simulation of small size longitudinal oscillation realization on the air bag hunting gear to hole deviation, a lever load maintainer is housed under this device, drives by an air lift pump 3 ' and realize loading.Drilling fluid 4 ' by steam piano by pipeline transportation to sleeve pipe and joint surface in contact.Contact force size during test and the wear extent of sleeve pipe 2 ' and joint 1 ' are gathered with the casing wear sensor 7 ' that loads hinged some place by the contact force sensor 5 ' and joint sample 1 ' the lip-deep tool-joint wear sensor 6 ' that are installed in respectively on the load maintainer in real time by computer control.
The Maurer testing machine has the quite good detecting system, but this testing machine is merely able to simulate the skimming wear working condition under the action of static load, and the impact slip synergic wear operating mode that can not cause at the transverse vibration of deep-well, ultra deep well bottom is carried out correlative study.
Because the defective that above-mentioned known abrasion tester exists, the inventor is for solving the problem that above-mentioned known technology exists, be to be determined to be engaged in the experience that this area is researched and developed for many years, made with it, finally obtain petroleum drilling pipe shocking and sliding wear tester of the present invention after development research repeatedly, it can overcome the defective of above-mentioned known testing machine fully.
Summary of the invention
The technical problem to be solved in the present invention is: can not satisfy at present abrasion tester and study the requirement of impacting the slip composite abrasion test between petroleum drilling drilling rod and the sleeve pipe under the circulatory mediator condition, a kind of impact sliding wear testing machine of special use is provided, it can be well impacts slip compound friction wearing and tearing carrying out systematic study to the petroleum drilling drilling rod and the sleeve pipe of different large scale materials under various medium circulation conditions, for oil drill rocker and casing wear research provide new research technique.
Technical solution of the present invention is: a kind of petroleum drilling pipe shocking and sliding wear tester, it comprises mounting and clamping system, kinematic train and excitation system, wherein, described mounting and clamping system fixed clamp tubular test coupon, one end of described kinematic train is to being equiped with test bar by described tubular test coupon, this test bar of described transmission system drives rotates around the axle center, described excitation system provides radially impulsive force to described test bar, drive this test bar and in rotation, impact the tubular test coupon that is fixed on the mounting and clamping system, realize compound impact sliding friction, and moment of torsion is passed to test bar by friction.
Aforesaid petroleum drilling pipe shocking and sliding wear tester, wherein said kinematic train is by buncher, main pulley, belt, form from belt pulley, transmission shaft, described transmission shaft is formed by three sections, preceding two sections axles are installed with bearing, to transmit the moment of torsion that produces by buncher, main pulley, belt, from belt pulley; The 3rd section axle is the test axle, its left end near second section axle is fixed by self-aligning ball bearing, middle by a bearings of floating, right-hand member is installed second test specimen, the 3rd section axle forms a balance staff, this balance staff can be in the figure paper plane under the impact force action of described excitation system be center of circle swing with described self-aligning ball bearing.
Aforesaid petroleum drilling pipe shocking and sliding wear tester, wherein said excitation system is by the exciting controller, vibrator, exciting rod, roll wheel assembly and support mechanism form, this vibrator is the radial impact power source of test axle, the exciting controller is used to adjust excitation parameter, realize complex vibration, described support mechanism comprises the exciting rod bar cover that is used to that the upper brace of this vibrator is installed and is used to limit the exciting rod transverse movement, this support mechanism and frame are fixed together, described roll wheel assembly is by support, roller and roller shaft are formed, described support upper end correspondence is arranged at this exciting rod lower end, and described roller keeps the rolling contact condition with the axle sleeve of test axle.
Aforesaid petroleum drilling pipe shocking and sliding wear tester, also comprise an answering system, this answering system is an elastic recovery moving up and down system, it is installed in another orientation of the transmission shaft relative with excitation system, comprise upper mounted plate, stability column, groups of springs and bottom plate, upper mounted plate is used for installing described unsteady bearing, bottom plate is fixed on the frame, every group of stability column by up and down two form, the bottom of last root stability column is equivalent to piston, following root stability column is equivalent to cylinder sleeve, the formation cooperation that can slide up and down, this transmission shaft is during by the elastic returning original position of groups of springs, and four groups of stability columns of four spring inners constitute the stability that sliding rail slides up and down with the warranty test axle.
Aforesaid petroleum drilling pipe shocking and sliding wear tester, also comprise a circulation system, form by pump, valve group, flowmeter, stirrer, this circulation system constitutes the adjustable multiphase medium lubricating system of flow, the lubricating condition of various flows moving medium is provided to abrasion tester, flowmeter is used for online detection flow, and stirrer is installed in the suction pit, keeps solid phase dispersed system performance.
Aforesaid petroleum drilling pipe shocking and sliding wear tester is equipped with displacement transducer on the upper end mounting and clamping system of described tubular test coupon, with online detection developmental tube and the total linear abrasion degree of check bar; In the lower end of answering system transmission shaft axle center offset sensor, online detection axis side-play amount are installed.
Aforesaid petroleum drilling pipe shocking and sliding wear tester comprises that also one detects control system, and should detect control system by detecting and control two parts are formed, and the test section is used to realize the online detection to test figure; Control section is used for the operational factor of testing machine is controlled in real time.
Characteristics of the present invention and advantage are: this testing machine can be realized the slide rod tube friction and wear research of compound working condition of the impact of controlled impact loading type under the heterogeneous circulation lubrication ambient condition.It not only can realize the multiphase medium circulation that flow is adjustable, composition is variable, and for impacting adjustable size, controllable complicated impact of wave mode, simultaneously can online detection friction force, parameters such as impulsive force, frequency of impact, wear extent, and by computer controlled automatic.In a word, actively this testing machine of application of advanced science and technology exploitation provides brand-new means for drilling well drilling bar casing wear and tribology research, will make huge contribution for drilling well drilling bar casing wear and Tribological Study.
Description of drawings
Fig. 1 is the general structure synoptic diagram of petroleum drilling pipe shocking and sliding wear tester of the present invention;
Fig. 2 A, Fig. 2 B are the structural representation of the mounting and clamping system of petroleum drilling pipe shocking and sliding wear tester of the present invention;
Fig. 3 is the synoptic diagram of the Detection ﹠ Controling system of petroleum drilling pipe shocking and sliding wear tester of the present invention;
Fig. 4 is the synoptic diagram of the circulation system of petroleum drilling pipe shocking and sliding wear tester of the present invention.
Fig. 5 is the drilling rod of Maurer company development and the synoptic diagram of casing tube abrasion testing machine.
The drawing reference numeral explanation:
1, mounting and clamping system 2, kinematic train 3, excitation system
4, answering system 5, the circulation system 6, Detection ﹠ Controling system
10, sleeve pipe test specimen 20, drilling rod test specimen 11, sleeve pipe clamper
12, piezometry bar 13, hinged-support 14, shock sensors
21, buncher 22, main pulley 23, belt
24, from belt pulley 25, transmission shaft 251, first section transmission shaft
252, second section transmission shaft 253, the 3rd section transmission shaft 26, torque sensor
27, universal joint 31, vibrator 32, support mechanism
33, exciting rod 34, roll wheel assembly 35, cup dolly
36, platform 38, exciting rod bar cover 41, upper mounted plate
42, stability column 43, spring 44, bottom plate
61, dynamic load effect point 62, static load application point
Embodiment
Following conjunction with figs. and specific embodiment are described in further detail the specific embodiment of the present invention.
As shown in the figure, the petroleum drilling pipe shocking and sliding wear tester that the present invention proposes, comprise mounting and clamping system 1, kinematic train 2 and excitation system 3, wherein, described mounting and clamping system 1 fixed clamp first test specimen, one end of described kinematic train 2 is to being equiped with second test specimen by first test specimen, described kinematic train 2 drives this second test specimen and rotates around the axle center, described excitation system 3 provides radially impulsive force to described second test specimen, drive this second test specimen and in rotation, impact first test specimen that is fixed on the mounting and clamping system 1, moment of torsion is passed to second test specimen by friction.
In a specific embodiment of the present invention, this first test specimen is a sleeve pipe test specimen 10, and this second test specimen is a drilling rod test specimen 20.
Shown in Fig. 1, Fig. 2 A and Fig. 2 B, mounting and clamping system 1 comprises a sleeve pipe clamper 11, and this sleeve pipe clamper 11 is fixed in metope and/or ground by a hinged-support 13, also can an integrated shock sensors 14 on mounting and clamping system, this clamper 11 is used for clamping sleeve pipe test specimen 10, the on-line measurement that shock sensors 14 realizes friction force and impulsive force.
As shown in Figure 1, kinematic train 2 is by buncher 21, main pulley 22, belt 23, form from belt pulley 24, transmission shaft, the outer end of described transmission shaft is stretched in the sleeve pipe test specimen 10, and to being equiped with drilling rod test specimen 20 by sleeve pipe test specimen 10, this transmission shaft can be to lower swing under the impact force action of excitation system 3.
In a specific embodiment of the present invention, transmission shaft is formed by three sections: preceding two sections axles 251,252 are installed with bearing 281,282, to transmit moment of torsion, first section transmission shaft 251 and second section 252 of transmission shaft are equipped with a torque sensor 26, the two ends of this torque sensor 26 are connected with second section transmission shaft with first section transmission shaft respectively by two shaft joints 291,292, to reach online detection rotating speed and the purpose of transmitting moment of torsion simultaneously; Connect by double end star coupling 27 between second section transmission shaft 251 and the 3rd section transmission shaft 253, the radial vibration that guarantees that the transmission phase place is consistent and reduce by the 3rd section transmission shaft 253 is to the leading portion transmission; The 3rd section axle 253 is test axles, its left end is preferable fixing by self-aligning ball bearing 283, middle by bearing 284 supports of floating, right-hand member is installed this drilling rod test specimen 20, thus, make the 3rd section axle 253 form a balance staff, this balance staff can be in the figure paper plane under the impact force action of described excitation system 3 be that swing in the center of circle with self-aligning ball bearing 283, thereby make this transmission shaft both can rotate the transmission moment of torsion, right-hand member can also swing up and down.
In the present embodiment, buncher 21 adopts the frequency modulation threephase asynchronous, and the moment of torsion of this transmission shaft is provided by the frequency modulation threephase asynchronous, and rotating speed can steplessly be adjusted, and realizes transmitting the effect of moment of torsion, deceleration and damping by V-shape belt.
Petroleum drilling pipe shocking and sliding wear tester of the present invention also comprises an answering system 4, this answering system 4 is an elastic recovery system, be used for making transmission shaft (test axle) that an elastic-restoring force that its homing that moves up is put is provided behind lower swing at excitation system 3, it is installed in the other direction of the transmission shaft relative with excitation system 4, as shown in Figure 1, this excitation system is installed in the top of transmission shaft, and then this answering system is installed in the below of transmission shaft 253.This answering system comprises upper mounted plate 41, stability column 42, groups of springs 43 and bottom plate 44, upper mounted plate 41 is used for installing the bearing 284 that this floats, bottom plate 44 is fixed on the frame, groups of springs 43 can correspondingly be sheathed on the stability column 42, comprise four groups of stability columns 42 and four groups of springs in the present embodiment, and every group of stability column by up and down two form, the bottom of last root stability column is equivalent to piston, following root stability column is equivalent to cylinder sleeve, the formation cooperation that can slide up and down, this transmission shaft is during by the elastic returning original position of groups of springs, and four groups of stability columns of four spring inners constitute the stability that sliding rail slides up and down with the warranty test axle.Certainly, this stability column 42 has numerous embodiments, as in another specific embodiment, this stability column 42 comprises two parts up and down, and wherein, the bottom stability column is fixed in bottom plate 44, and the top stability column is fixed in upper mounted plate 41, upper mounted plate is a hollow columnar structures, be used for when transmission shaft is upwards replied the bottom stability column being entered in the cavity of top stability column, thereby the track warranty test axle that constitute to slide is only done and slided up and down.For the ease of testing machine being provided static load and/or dynamic loading, on the bearing seat of the floating bearing 284 of the transmission shaft that joins with answering system 4 and/or the roller place of excitation system 3 be provided with static load and/or dynamic loading load(ing) point respectively.Certainly, this static load load(ing) point also can be located at other position, is not limited in this.
In a specific embodiment of the present invention, this petroleum drilling pipe shocking and sliding wear tester also comprises a circulation system 5, as shown in Figure 4, this circulation system can be by steam piano, the valve group, flowmeter, stirrer, abrasive dust collector, compositions such as filtrator, this circulation system constitutes the adjustable multiphase medium lubricating system of flow, the lubricating condition of various flows moving medium is provided to abrasion tester, the outside of mounting and clamping system 1 can correspondence be provided with mud baffle 58, but its inboard relative set mud outlet device 59, be used to make used multiphase medium can be recycled, flowmeter is used for online detection flow, stirrer also is installed, to keep solid phase dispersed system performance in the suction pit.Because employed each parts of this circulation system are known configurations, therefore, no longer its concrete structure are described in detail herein.
As shown in Figure 3, petroleum drilling pipe shocking and sliding wear tester of the present invention comprises that also a whole set of detects control system, and should detect control system and form by detecting and control two parts.
The test section comprises a multichannel data acquisition system, be used to realize online detection to test figures such as rotating speed, moment of torsion, frequency of impact, impulsive force, friction force and wear extenies, relevant pick-up unit can comprise a torque sensor 26, linear abrasion sensor, desaxe sensor, shock sensors 14, flowmeter, static load sensor, wherein: torque sensor 26 is installed on the transmission shaft, is used to detect the rotating speed and the moment of torsion of transmission shaft; The actual displacement transducer that can be of linear abrasion sensor, it is installed on the mounting and clamping system 1, is used to detect total linear abrasion amount of sleeve pipe test specimen and drilling rod test specimen; The axle offset sensor is installed on the lower end of answering system 4, is used to detect the journal offset amount of test axle; As shown in Figure 3, this shock sensors is installed in the bottom of mounting and clamping system, with online detection actual impulse; Flowmeter detects the flow of the multiphase medium lubricating system in the circulation system 5.The above-mentioned test figure that multichannel data acquisition system will collect converts digital signal to and is sent to control section (can be computing machine), realize real-time control by this control section by circuit, the operational factors such as rotating speed, frequency of impact, impulsive force, surge waveform and rate-of flow of testing machine are carried out suitable adjustment according to detected test figure and actual needs to buncher, vibrator, water pump, solenoid valve, stirrer and abrasive dust collector.
Regulating device is equipped with in the bottom of described mounting and clamping system 1, suitably to adjust the gap of test bar and tubular test coupon by the requirement of test, satisfies the different tests condition.Because this regulating device can known configurations realize, repeats no more herein.
For the reliability and the authenticity of the impulsive force that guarantees online detection, this shock sensors can adopt highly sensitive piezoelectric force transducer, and the mounting and clamping system 1 of this piezoelectric force transducer and tubular test coupon integrates.
This testing machine can be used for studying the rod tube phase impact skimming wear situation under different materials, the different medium lubricating condition, and its concrete using method is as follows: at first tubular test coupon and test bar are installed on the testing machine; The deployed medium that will use is put into suction pit; Check and each detecting sensor of initialization; Testing machine is added static load; Start the circulation system, be adjusted to suitable flow; The rotation of motoring ring test axle is set and the startup varying-speed motor; Be provided with and the startup vibrator, begin test; The protracted test process, the every detection data of online collection in this process, also can further be controlled operational factor by control section according to detecting data in real time; Close vibrator; Close varying-speed motor; Close closed loop system; The dismounting test specimen; Measure the actual linear wear extent of two test specimens.
In a specific embodiment of the present invention, thoughtful drilling rod test specimen diameter be 168mm, axial width 8～40mm, sleeve pipe test specimen diameter 244.5mm, axial width 80mm, wall thickness 10mm.The static load maximal value 8000N that can add on the test specimen, the maximum exciting force 8000N of vibrator, 60～200 rev/mins of speed of mainshaft adjustable extents, circulating mud discharge capacity 1.0 sides/hour more than.Following table (table 1) is the comparison of the parameters of the present invention and known various types of abrasion testers:
The all types of testing machines of table 1 are relatively tabulated
| The testing machine type | The impulsive force size | The vibration shape | Sample dimensions | Medium | Detection system |
| Pin dish testing machine | Little | Simply | Minimum | Submergence is static | Better |
| Reciprocal impact testing machine | Little | Simply | Less | Do not have | Generally |
| The pulsatile impact testing machine | Bigger | Simply | Bigger | Do not have | Generally |
| The Maurer testing machine | Do not have | Do not have | Greatly | Heterogeneous circulation | Good |
| Testing machine of the present invention | Greatly | Complicated | Greatly | Heterogeneous circulation | Good |
Though the present invention has utilized aforementioned specific embodiment to disclose in detail; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (7)
1, a kind of petroleum drilling pipe shocking and sliding wear tester, it is characterized in that: comprise mounting and clamping system, kinematic train and excitation system, wherein, described mounting and clamping system fixed clamp tubular test coupon, one end of described kinematic train is to being equiped with test bar by described tubular test coupon, this test bar of described transmission system drives rotates around the axle center, described excitation system provides radially impulsive force to described test bar, drive this test bar and in rotation, impact the tubular test coupon that is fixed on the mounting and clamping system, realize compound impact sliding friction, moment of torsion is passed to test bar by friction.
2, petroleum drilling pipe shocking and sliding wear tester as claimed in claim 1, it is characterized in that: described kinematic train is by buncher, main pulley, belt, form from belt pulley, transmission shaft, described transmission shaft is formed by three sections, preceding two sections axles are installed with bearing, to transmit the moment of torsion that produces by buncher, main pulley, belt, from belt pulley; The 3rd section axle is the test axle, its left end near second section axle is fixed by self-aligning ball bearing, middle by a bearings of floating, right-hand member is installed second test specimen, the 3rd section axle forms a balance staff, this balance staff can be in the figure paper plane under the impact force action of described excitation system be center of circle swing with described self-aligning ball bearing.
3, petroleum drilling pipe shocking and sliding wear tester as claimed in claim 1, it is characterized in that: described excitation system is by the exciting controller, vibrator, exciting rod, roll wheel assembly and support mechanism form, this vibrator is the radial impact power source of test axle, the exciting controller is used to adjust excitation parameter, realize complex vibration, described support mechanism comprises the exciting rod bar cover that is used to that the upper brace of this vibrator is installed and is used to limit the exciting rod transverse movement, this support mechanism and frame are fixed together, described roll wheel assembly is by support, roller and roller shaft are formed, described support upper end correspondence is arranged at this exciting rod lower end, and described roller keeps the rolling contact condition with the axle sleeve of test axle.
4, petroleum drilling pipe shocking and sliding wear tester as claimed in claim 2, it is characterized in that: described abrasion tester also comprises an answering system, this answering system is an elastic recovery moving up and down system, it is installed in another orientation of the transmission shaft relative with excitation system, comprise upper mounted plate, stability column, groups of springs and bottom plate, upper mounted plate is used for installing described unsteady bearing, bottom plate is fixed on the frame, every group of stability column by up and down two form, the bottom of last root stability column is equivalent to piston, following root stability column is equivalent to cylinder sleeve, the formation cooperation that can slide up and down, this transmission shaft is during by the elastic returning original position of groups of springs, and four groups of stability columns of four spring inners constitute the stability that sliding rail slides up and down with the warranty test axle.
5, petroleum drilling pipe shocking and sliding wear tester as claimed in claim 1, it is characterized in that: described impact sliding wear testing machine also comprises a circulation system, form by pump, valve group, flowmeter, stirrer, this circulation system constitutes the adjustable multiphase medium lubricating system of flow, the lubricating condition of various flows moving medium is provided to abrasion tester, flowmeter is used for online detection flow, and stirrer is installed in the suction pit, keeps solid phase dispersed system performance.
6, petroleum drilling pipe shocking and sliding wear tester as claimed in claim 1 is characterized in that: on the upper end mounting and clamping system of described tubular test coupon displacement transducer is installed, with online detection developmental tube and the total linear abrasion degree of check bar; In the lower end of answering system transmission shaft axle center offset sensor, online detection axis side-play amount are installed.
7, petroleum drilling pipe shocking and sliding wear tester as claimed in claim 1, it is characterized in that: described abrasion tester comprises that also one detects control system, and should detect control system by detecting and control two parts are formed, the test section is used to realize the online detection to test figure; Control section is used for the operational factor of testing machine is controlled in real time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101232609A CN100510690C (en) | 2005-11-15 | 2005-11-15 | Petroleum drilling pipe shocking and sliding wear tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101232609A CN100510690C (en) | 2005-11-15 | 2005-11-15 | Petroleum drilling pipe shocking and sliding wear tester |
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| CN1967202A true CN1967202A (en) | 2007-05-23 |
| CN100510690C CN100510690C (en) | 2009-07-08 |
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| CNB2005101232609A Expired - Fee Related CN100510690C (en) | 2005-11-15 | 2005-11-15 | Petroleum drilling pipe shocking and sliding wear tester |
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2005
- 2005-11-15 CN CNB2005101232609A patent/CN100510690C/en not_active Expired - Fee Related
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