CN103061745A - Test device and method for mechanical characteristics of simulation bottom hole assembly - Google Patents
Test device and method for mechanical characteristics of simulation bottom hole assembly Download PDFInfo
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- CN103061745A CN103061745A CN 201210548480 CN201210548480A CN103061745A CN 103061745 A CN103061745 A CN 103061745A CN 201210548480 CN201210548480 CN 201210548480 CN 201210548480 A CN201210548480 A CN 201210548480A CN 103061745 A CN103061745 A CN 103061745A
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Abstract
The invention relates to a test device and method for mechanical characteristics of a simulation bottom hole assembly, and belongs to the technical field of pipe string mechanical testing. The device comprises a simulation bottom hole assembly system, a driving system, a control system, a measuring system and a hoisting system, and is mainly composed of a test stand, a test bed, a hydraulic motor, a measuring and control instrument, a motor, an eddy current displacement sensor, a force measuring device, a computer, a signal acquisition module, a signal cable, a simulation drill string, a simulation wellbore, a wirerope and the like. The test method includes determining geometrical dimensions of the simulation drill string and the wellbore according to a similarity theory, subjecting the simulation drill string to stress calculation and designing the sensor according to a calculation result, hoisting the test bed to be at a needed hole drift angle through the hoisting system, loading an axial displacement and rotation speed to the simulation drill string through the driving system and the control system, and measuring axial force, lateral force and rotation angle of a simulation drill and a whirl motion law of the simulation drill string through the measuring system. According to the test device and method for the mechanical characteristics of the simulation bottom hole assembly, research quality of the mechanical characteristics of the simulation bottom hole assembly can be improved.
Description
Technical field
The invention belongs to tubing string mechanical test technical field, relate to a kind of experimental rig for simulation Bottom Hole Assembly (BHA) mechanical characteristic, also relate to the test method of using this experimental rig, be used for the simulation drill bit is measured at the radial motion track of axial force, lateral force, corner and the drill string diverse location of rotary drilling process.
Background technology
In oil exploration and development process, the drilling well basic link that is absolutely necessary has fund and technology-intensive feature.The drill string mechanics characteristic research is the important component part of modern drilling engineering theory and technology.Along with drilling technology to future developments such as hp-ht well, deep ﹠ ultra-deep well, special wells (comprising directional well, horizontal well, extended reach well, complex structural well, cluster well, under balance pressure drilling and casing drilling etc.), to tubing string mechanics Bottom Hole Assembly (BHA) (Bottom-Hole Assembly particularly, be called for short BHA) mechanical property researched and proposed higher requirement, in the hope of further grasping the mechanism of Bottom Hole Assembly (BHA) deviation prevention and fast.
Domestic and international many scholars have carried out a large amount of theoretical researches to the mechanics problem of Bottom Hole Assembly (BHA), and by setting up ideal model and theoretical calculating, have obtained a lot of achievements.Such as, from nineteen fifty A.Lubinski than system, studied the stressed and distortion of drill string in the Vertical Well all sidedly, started after the new situation of drill string mechanics research, the calculus of finite differences of energy method, W.B.Bradley and the F.J.Fischer of B.H.Walker, the bending with combined axial and lateral load method of white family happiness, the Finite Element of K.K.Millheim, the weighted residual method of Gao Deli, the prebending kinetics deviation control and fast drilling assembly kinetic model of Di Qinfeng etc. have successively occurred, but only understood and the mechanical characteristic of analyzing bottom drill string is incomplete from point of theory.
Along with the development of logging while drilling technology, abroad utilize respectively cable transmission, downhole stored to carry out having obtained large development based on methods such as the down-hole actual measurement of bottom drill string kinetic model and lab simulation measurements.Some mechanisms mainly develop the downhole tool pipe nipple at present, obtain the related data of Bottom Hole Assembly (BHA) mechanical characteristic aspect, down-hole by on-the-spot test.Patent US4324297 and US4445578 have designed respectively the test pipe nipple structure of measuring moment of flexure, shearing force, and by the survey data derivation lateral force that detects, but these limited parameters can not fully reflect the mechanical characteristic of bottom drill tool.Patent US4662458 and US4958517 propose to arrange that at the test pipe nipple foil gauge is to realize the isoparametric measurement of axial force, moment of torsion, shearing force and moment of flexure of bottom drill tool, but facing, field measurement realizes that difficulty is large, testing expense is high, number of times, place and the time of simultaneously on-the-spot test are conditional, so measured result can not reflect the mechanical characteristic of Bottom Hole Assembly (BHA) comprehensively.
Because there is above problem in field measurement, ground survey becomes one of study hotspot gradually as the research means of the mechanical characteristic of analyzing Bottom Hole Assembly (BHA).The people such as calendar year 2001 Macpherson respectively in the test pipe nipple on drill bit top and wheel disc top sensor installation carry out the isoparametric ground survey of the pressure of the drill, moment of torsion, moment of flexure and vibration acceleration, in conjunction with the drill string dynamic model of setting up by ground survey resulting estimate bottom drill tool dynamic characteristic.The people such as Guan Zhichuan in 2004 set up straight well bottom drill string motion state experimental rig (referring to Guan Zhichuan, Jin Yanxin, Wang Yifa. the experimental study [J] of straight well bottom drill string motion state. petroleum journal .2003,24 (6): 102-106.).This device selects lucite tube as simulation wellbore hole, utilize the engineering plastic charge bar as the simulation bottom drill string, for measuring the motion state of bottom drill string under different the pressure of the drill, speed conditions, the pressure of the drill and displacement transducer are housed respectively, in real time rotating speed and the pressure of the drill of measure analog bottom drill string on this analogue means.But there are difference in the simulation bottom drill string of this experimental rig and actual steel drilling tool, and can not carry out the contrast test under the various hole angles.2008, Chinese patent 200810239189.4 has proposed the measuring system of simulation bottom drill string dynamic force, but only drilling rod and stabilizer have been carried out simulation and do not simulated drill bit, and nearly drill bit has carried out solid, belonged to hinged actual conditions with drill bit in the actual well drilled process and be not inconsistent.
Ground survey need not to consider the Various Complex condition of down-hole, and structure design is relatively simple, on-the-spot easy for installation, but the method need to be carried out to the fringe conditions of on-the-spot test accurately suitable processing.Therefore, be further investigation Bottom Hole Assembly (BHA) mechanical characteristic, be necessary further to carry out the laboratory simulation test research of Bottom Hole Assembly (BHA) mechanical characteristic, thereby can further improve the Design of Mechanical Structure of Bottom Hole Assembly (BHA), further grasp the mechanism of Bottom Hole Assembly (BHA) deviation prevention and fast.
Summary of the invention
The present invention seeks in order to overcome problem and the deficiency of above-mentioned prior art existence of present stage, a kind of experimental rig and test method for simulation Bottom Hole Assembly (BHA) mechanical characteristic is provided, study mechanical characteristic and the whirling motion rule of different Bottom Hole Assembly (BHA) when different the pressure of the drill, rotating speed, hole angle, for on-the-spot Bottom Hole Assembly (BHA) choose and application provides foundation.
The invention provides a kind of experimental rig for the simulation of Bottom Hole Assembly (BHA) mechanical characteristic, it is characterized in that, this device comprises simulation Bottom Hole Assembly (BHA) system, drive system, control system, measuring system, Hoisting System; Simulation Bottom Hole Assembly (BHA) system is comprised of simulation wellbore hole 16, simulation drill collar 17, simulation stabilizer 18, simulation drill bit 24; Drive system is comprised of motor 11, hydraulic motor 12; Control system is comprised of measurement and control instrument 13, Industrial Personal Computer (IPC) 14; Measuring system is comprised of computer 19, signal acquisition module 20, eddy current displacement sensor 21, signal cable 22, device for measuring force 23; Hoisting System is comprised of joint 5, slide block 6, motor 7, test stand 8, pulley 9, wirerope 10.
The present invention also proposes to use the test method of this simulation Bottom Hole Assembly (BHA) dynamic characteristic test apparatus, comprises following steps:
1) will simulate drill collar 17 is threaded connection with simulation drill bit 24, to simulate stabilizer 18 and be installed in by countersunk bolts and form the simulation drill string on the simulation drill collar 17, and simulation wellbore hole 16 will be enclosed within simulation drill string outside and simulation wellbore hole 16 is installed on the adjustable seats 15 and clamp;
2) voltage collector that by signal cable 22 computer 19, signal acquisition module 20 is comprised is connected the tension-compression sensor that eddy current displacement sensor 21, device for measuring force 23 comprise and is connected with lateral force sensors with the strain acquirement device;
3) start Hoisting System and testing counter 4 is promoted to the hole angle that needs;
4) start drive system, open measurement and control instrument 13, start motor 11 and control hydraulic motor oil sources is forced into required pressure by measurement and control instrument 13;
5) start control system, open Industrial Personal Computer (IPC) 14, load suitable rotating speed by control software for simulation drill collar 17; Load certain axial displacement by measurement and control instrument 13 for simulation drill collar 17;
6) according to test requirements document, initialize each data acquisition unit;
7) acquisition test data, and viewing test phenomenon;
8) unload behind simulation drill collar 17 rotation certain hours, discharge rate is identical with loading velocity;
9) deformation of completion of discharge inspection simulation drill collar 17 observes whether plastic strain occurs, and as plastic strain occurs, then needs to change test specimen;
10) as required, repeating step 1), 2), 3), 4), 5), 6), 7), 8), 9), until the simulation Bottom Hole Assembly (BHA) under the different condition has been carried out after the contrast test, stop test.
Description of drawings
Fig. 1 is the experimental rig schematic diagram of simulation Bottom Hole Assembly (BHA) mechanical characteristic of the present invention.
Fig. 2 is the assembling schematic diagram of simulation Bottom Hole Assembly (BHA) of the present invention system; Wherein
(a) for simulating the assembling schematic diagram of Bottom Hole Assembly (BHA) system, (b) be that the A-A of (a) figure is to sectional drawing.
Fig. 3 is the structural representation of eddy current displacement sensor erection support of the present invention.
Fig. 4 is the use flow chart of eddy current displacement sensor of the present invention.
Fig. 5 is device for measuring force assembling drawing of the present invention.
Fig. 6 is the use flow chart of device for measuring force of the present invention.
Among the figure: 1. baffle plate, 2. track, 3. roller, 4. testing counter, 5. joint, 6. slide block, 7. motor, 8. test stand, 9. pulley, 10. wirerope, 11. motor, 12. hydraulic motor, 13. measurement and control instrument, 14. Industrial Personal Computer (IPC), 15. adjustable seats, 16. simulation wellbore hole, 17. simulation drill collar, 18. simulation stabilizer, 19. computer, 20. signal acquisition module, 21. eddy current displacement sensor, 22. signal cable, 23. device for measuring force, 24. simulation drill bit, 25. fixed end, 26. countersunk bolts, 27. bearing, 28. bolt, 29. vertical erection support, 30. bolt, 31. horizontal erection support, 32. mount pad, 33. lateral force sensors, 34. foil gauge, 35. flexure strip, 36. tension-compression sensor depression bar, 37. fastening bolt, 38. clamp nut, 39. tension-compression sensor, 40. base.
The specific embodiment
The present invention relates to a kind of experimental rig and test method of simulating the Bottom Hole Assembly (BHA) mechanical characteristic, the invention will be further elaborated with the specific embodiment by reference to the accompanying drawings.
As shown in Figure 1, experimental rig provided by the invention comprises simulation Bottom Hole Assembly (BHA) system, drive system, control system, measuring system, Hoisting System; Simulation Bottom Hole Assembly (BHA) system is comprised of simulation wellbore hole 16, simulation drill collar 17, simulation stabilizer 18, simulation drill bit 24; Drive system is comprised of motor 11, hydraulic motor 12; Control system is comprised of measurement and control instrument 13, Industrial Personal Computer (IPC) 14; Measuring system is comprised of computer 19, signal acquisition module 20, eddy current displacement sensor 21, signal cable 22, device for measuring force 23; Hoisting System is comprised of joint 5, slide block 6, motor 7, test stand 8, pulley 9, wirerope 10.
As shown in Figure 2, in simulation Bottom Hole Assembly (BHA) system, simulation wellbore hole 16 is made by glass tube or metal tube; Simulation drill collar 17 is the steel pipe; Simulation stabilizer 18 is the steel pipe, and its internal diameter equates that with simulation drill collar 17 external diameters its external diameter does not wait the stabilizer with the simulation different-diameter; Simulating the some screws of stabilizer 18 processing, tighten up simulation drill collar 17 and simulation stabilizer 18 with countersunk bolts 26, simulate the position of stabilizer 18 to simulate different Bottom Hole Assembly (BHA) by slidable adjustment; Simulation drill bit 24 is that the certain steel ball of screw rod and diameter forms, and simulation drill collar 17 and simulation drill bit 24 are threaded connection.
In drive system, motor 11 is AC servo motor, can carry out infinitely variable speeds, for simulation drill collar 17 provides rotating speed; Hydraulic motor 12 adopts high pressure fuel source to drive, and can axially drive simulation drill collar 17, and axial displacement is provided.
In control system, measurement and control instrument 13 adopts American MTS (full name: Mechanical Testing﹠amp; Simulation) company's 407 electrohydraulic servo-controlling systems, the sound attitude Loading Control of realization simulation drill collar 17 axial forces; Industrial Personal Computer (IPC) 14 is installed the control softwares, rotating speed that can control simulation drill collar 17.
In measuring system, signal acquisition module 20 comprises voltage collector 6220 and strain acquirement device 6224; Eddy current displacement sensor 21 comprises three groups, 2 every group, is installed in respectively on the erection support of loading end, middle part and the nearly drill bit of simulating drill collar 17; The structural representation of eddy current displacement sensor erection support as shown in Figure 3, eddy current displacement sensor is connected and fixed vertical erection support 29 by the bearing 27 on bolt 28 and the testing counter 4, the horizontal erection support 31 of eddy current displacement sensor is connected and fixed by bolt 30 and vertical erection support 29; Three groups of eddy current displacement sensors 21 connect by signal cable 22, and voltage collector 6220 is used, and eddy current displacement sensor 21 can adopt the OD000 type eddy current displacement sensor of Beijing peace enlightening century Electronics Co., Ltd., demarcates when dispatching from the factory; As shown in Figure 4, after the displacement signal of simulation drill collar 17 mutually perpendicular two radial direction that eddy current displacement sensor 21 will measure is converted into voltage signal, voltage collector 6220 is according to the frequency acquisition collection signal that has set, and be stored in the computer 19, read the data that recorded after to be tested the finishing, then carry out data according to calibration result and transform, the radial displacement of synthetic simulation drill collar 17, and then obtain simulating whirl orbit and the direction of drill collar 17; The eddy current displacement sensor 21 that is positioned at simulation drill collar 17 nearly drill bits can be measured with the distance of simulation drill bit 24, and the displacement of its radial direction is arranged again, can obtain simulating the corner of drill bit 24.
Shown in Figure 5, device for measuring force 23 comprises a lateral force sensors 33 and a tension-compression sensor 39; Lateral force sensors 33 embeds mount pad 32, formed by 3 alternate flexure strips of 120 ° 35, the material of flexure strip 35 is spring steel, be fixed on the lateral force sensors 33 by flexure strip fastening bolt 37, the inscribe diameter of a circle of 3 flexure strips 35 and the equal diameters of simulating drill bit 24 contact under original state with simulation drill bit 24 to guarantee 3 flexure strips 35; Foil gauge 34 is attached to the two sides of flexure strip 35 to consist of the strain-type force sensor of half-bridge connection; Thickness by changing flexure strip 35 and cooperate can measure analog drill bit 24 with strain acquirement device 6224 different lateral forces.
Tension-compression sensor 39 is demarcated when dispatching from the factory for the LC1102 type strain-type tension-compression sensor that peace enlightening century Electronics Co., Ltd. in Beijing produces; The tension-compression sensor depression bar 36 of tension-compression sensor 39 is flat head bolt, with the simulation drill bit 24 on same axis, be installed on the tension-compression sensor 39, the top contacts with the top of simulation drill bit 24, strain by measuring tension-compression sensor depression bar 36 is with the axial force of measure analog drill bit 24, and the clamp nut 38 of tension-compression sensor depression bar tightens up depression bar 36 to eliminate the gap that is threaded between depression bar 36 and the tension-compression sensor 39; The axial displacement of base 40 constraint tension-compression sensors 12.
The using method of device for measuring force 23 as shown in Figure 6, lateral force sensors 33 should be demarcated it before using, and obtained the corresponding relation of power and strain; Be installed in lateral force sensors 33 and tension-compression sensor 39 on the mount pad 32 and the end 25 that is fixed on scroll chuck be fixedly clamped; By signal cable 22 lateral force sensors 33, tension-compression sensor 39 and signal acquisition module 20, computer 19 are linked together; After control system loads certain rotating speed and axial compression for simulation drill collar 17, signal acquisition module 20 will be according to the frequency acquisition collection signal of having established, and be stored in the computer 19, read the data that recorded after to be tested the finishing, then carry out data according to nominal data and transform, obtain simulating the axial force of drill bit 24 and the measured value of 3 flexure strips 35; The measured value of 3 flexure strips 35 can be designated as respectively F
1, F
2, F
3(take pressure as "+", pulling force be "-") is by to F
1, F
2, F
3Make a concerted effort to calculate and to obtain size and the direction of making a concerted effort, namely simulate the lateral force of drill bit 24.
In Hoisting System, motor 7 is servomotor, can control the forward or reverse of motor 7 by control panel; Pulley 9 is installed in the top of test stand 8; Motor 7 by pulley 9 can control wirerope 10 on carry or transfer, band movable slider 6, the roller 3 by joint 5 and then motoring ring test platform 4 rotates at track 2, testing counter 4 can be promoted to the hole angle that needs; Baffle plate 1 prevents that testing counter 4 from skidding off track 2.
Use the test method of this simulation Bottom Hole Assembly (BHA) dynamic characteristic test apparatus as follows: 1) will simulate drill collar 17 and be threaded connection with simulation drill bit 24, to simulate stabilizer 18 and be installed in by countersunk bolts 26 and form the simulation drill string on the simulation drill collar 17, and simulation wellbore hole 16 will be enclosed within simulation drill string outside and simulation wellbore hole 16 is installed on the adjustable seats 15 and clamp; 2) connect lateral force sensors 33 and the tension-compression sensor 39 that voltage collector 6220 that computers 19, signal acquisition module 20 comprise and strain acquirement device 6224, eddy current displacement sensor 21, device for measuring force 23 comprise by signal cable 22; 3) start Hoisting System and testing counter 4 is promoted to the hole angle that needs; 4) start drive system, start motor 7, by hydraulic motor oil sources is forced into required pressure; 5) start control system, open Industrial Personal Computer (IPC) 14, load suitable rotating speed by control software for simulation drill collar 17; Load certain axial displacement by measurement and control instrument 13 for simulation drill collar 17; 6) initialize each data acquisition unit according to test requirements document; 7) acquisition test data, and viewing test phenomenon; 8) unload behind simulation drill collar 17 rotation certain hours, discharge rate is identical with loading velocity; 9) deformation of completion of discharge inspection simulation drill collar 17 observes whether plastic strain occurs, and as plastic strain occurs, then needs to change test specimen; 10) as required, repeating step 1), 2), 3), 4), 5), 6), 7), 8), 9), until the simulation Bottom Hole Assembly (BHA) under the different condition has been carried out after the contrast test, stop test.
Claims (8)
1. an experimental rig of simulating the Bottom Hole Assembly (BHA) mechanical characteristic is characterized in that, this device comprises simulation Bottom Hole Assembly (BHA) system, drive system, control system, measuring system, Hoisting System; Simulation Bottom Hole Assembly (BHA) system is comprised of simulation wellbore hole (16), simulation drill collar (17), simulation stabilizer (18), simulation drill bit (24); Drive system is comprised of motor (11), hydraulic motor (12); Control system is comprised of measurement and control instrument (13), Industrial Personal Computer (IPC) (14); Measuring system is comprised of computer (19), signal acquisition module (20), eddy current displacement sensor (21), signal cable (22), device for measuring force (23); Hoisting System is comprised of joint (5), slide block (6), motor (7), test stand (8), pulley (9), wirerope (10).
2. experimental rig as claimed in claim 1 is characterized in that: the simulation wellbore hole (16) of described simulation Bottom Hole Assembly (BHA) system is made by glass tube or metal tube; Simulation drill collar (17) is the steel pipe; Simulation stabilizer (18) is the steel pipe, its internal diameter equates with simulation drill collar external diameter, its outer radius variable is with the stabilizer of simulation different-diameter, at the some screws of simulation stabilizer processing, tighten up simulation drill collar (17) and simulation stabilizer (18) with countersunk bolts, simulate the position of stabilizer to simulate different Bottom Hole Assembly (BHA) by slidable adjustment; Simulation drill bit (24) is comprised of screw rod and the certain steel ball of diameter; Simulation drill collar (17) and simulation drill bit (24) are threaded connection.
3. experimental rig as claimed in claim 1, it is characterized in that: the motor of described drive system (11) is AC servo motor, can carry out infinitely variable speeds, for simulation drill collar (17) provides rotating speed; Hydraulic motor (12) adopts high pressure fuel source to drive, and can drive simulation drill collar (17), and axial displacement is provided.
4. experimental rig as claimed in claim 1 is characterized in that: the measurement and control instrument of described control system (13) employing electrohydraulic servo-controlling system, the sound attitude Loading Control of realization simulation drill collar (17) axial force; Industrial Personal Computer (IPC) (14) is in order to the rotating speed of control simulation drill collar (17).
5. experimental rig as claimed in claim 1, it is characterized in that: the signal acquisition module of described measuring system (20) comprises voltage collector and strain acquirement device; Eddy current displacement sensor (21) comprises three groups, every group 2, each group is installed in respectively loading end, middle part and the nearly drill bit of simulation drill collar (17), connect by signal cable (22), the displacement signal that is used mutually perpendicular two radial direction of measure analog drill collar (17) with voltage collector also reads by computer (19), the displacement of simulation drill collar (17) be can synthesize, and then whirl orbit and the direction of drill collar (17) obtained simulating; The eddy current displacement sensor that is positioned at the nearly drill bit of simulation drill collar (17) can be measured with the distance of simulation drill bit (24), again by the displacement of its radial direction, can obtain simulating the corner of drill bit (24).
6. experimental rig as claimed in claim 5, it is characterized in that: described device for measuring force (23) comprises a tension-compression sensor and a lateral force sensors; The depression bar of tension-compression sensor is flat head bolt, simulation drill bit (24) and depression bar on same axis, the axial force that the strain by measuring depression bar can measure analog drill bit (24); Lateral force sensors is made of 3 alternate 120 ° flexure strips, its inscribed circle diameter that surrounds and the equal diameters of simulating drill bit (24); The two sides that foil gauge is attached to flexure strip consists of the strain-type force sensor that half-bridge connects; By being used lateral force with measure analog drill bit (24) with the strain acquirement device.
7. experimental rig as claimed in claim 1, it is characterized in that: the motor of described Hoisting System (7) is AC servo motor, can control the forward or reverse of motor (7) by control panel; Pulley (9) is installed in the top of test stand (8); Motor (7) by pulley (9) can control wirerope (10) on carry or transfer, band movable slider (6), roller (3) by joint (5) and then motoring ring test platform (4) rotates at track (2), testing counter (4) can be promoted to the hole angle that needs; Baffle plate (1) prevents that testing counter (4) from skidding off track (2).
8. test method that adopts the experimental rig of each described simulation Bottom Hole Assembly (BHA) mechanical characteristic of claim 1-7 is characterized in that comprising following steps:
1) will simulate drill collar (17) and the simulation drill bit (24) be threaded connection, to simulate stabilizer (18) and be installed in the upper formation simulation of simulation drill collar (17) drill string by countersunk bolts, simulation wellbore hole (16) is enclosed within simulation drill string outside and simulation wellbore hole (16) is installed in the upper clamping of adjustable seats (15);
2) voltage collector that by signal cable (22) computer (19), signal acquisition module (20) is comprised is connected the tension-compression sensor that eddy current displacement sensor (21), device for measuring force (23) comprise and is connected with lateral force sensors with the strain acquirement device;
3) start Hoisting System and testing counter (4) is promoted to the hole angle that needs;
4) start drive system, open measurement and control instrument (13), start motor (11) and by hydraulic motor oil sources is forced into required pressure by measurement and control instrument (13);
5) start control system, open Industrial Personal Computer (IPC) (14), load suitable rotating speed by control software control motor (7) for simulation drill collar (17); Load certain axial displacement by measurement and control instrument (13) for simulation drill collar (17);
6) according to test requirements document, initialize each data acquisition unit;
7) acquisition test data, and viewing test phenomenon;
8) unload behind simulation drill collar (17) rotation certain hour, discharge rate is identical with loading velocity;
9) deformation of completion of discharge inspection simulation drill collar (17) observes whether plastic strain occurs, and as plastic strain occurs, then needs to change test specimen;
10) change test conditions, repeating step 1), 2), 3), 4), 5), 6), 7), 8), 9), until the simulation Bottom Hole Assembly (BHA) under the different condition has been carried out after the contrast test, stop test.
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Application publication date: 20130424 |