CN104712324A - Novel sound insulator well logging device for acoustic logging instrument and optimization design method - Google Patents
Novel sound insulator well logging device for acoustic logging instrument and optimization design method Download PDFInfo
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- CN104712324A CN104712324A CN201410763386.1A CN201410763386A CN104712324A CN 104712324 A CN104712324 A CN 104712324A CN 201410763386 A CN201410763386 A CN 201410763386A CN 104712324 A CN104712324 A CN 104712324A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 title claims abstract description 15
- 239000002847 sound insulator Substances 0.000 title abstract 8
- 238000005457 optimization Methods 0.000 title abstract 3
- 238000009413 insulation Methods 0.000 claims abstract description 139
- 230000000694 effects Effects 0.000 claims abstract description 28
- 239000010985 leather Substances 0.000 claims description 41
- 238000004088 simulation Methods 0.000 claims description 22
- 210000001503 joint Anatomy 0.000 claims description 7
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 238000005307 time correlation function Methods 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 abstract 2
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- 238000005452 bending Methods 0.000 description 20
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to the field of geophysical prospecting/acoustic well logging, and discloses a novel sound insulator well logging device for an acoustic logging instrument and an optimization design method of a novel sound insulator. The novel sound insulator well logging device for the acoustic logging instrument comprises a sound insulation assembly, an upper connector assembly, a lower connector assembly and a middle section connector assembly. The upper connector assembly and the lower connector assembly are provided with a receiving transducer and a transmitting transducer respectively. The sound insulation assembly comprises a transmitting sound insulation assembly and a receiving sound insulation assembly. The transmitting sound insulation assembly and the receiving sound insulation assembly are combined, so that the delay time of direct waves is effectively prolonged, and meanwhile the amplitude of the direct waves is attenuated to a certain extent. According to the novel sound insulator well logging device for the acoustic logging instrument and the optimization design method, the transmitting section sound insulator and the receiving section sound insulator are combined, so that the delay time of the direct waves is effectively prolonged, the amplitude of the direct waves is attenuated obviously so that the sound insulation effect can be improved, the sound insulator can achieve good direct wave delay and sound insulation effects within a wide frequency range, and the safety of the well logging device can be well guaranteed when the well condition is bad. The device is simple in overall structure, reasonable in design and beneficial to application and popularization.
Description
Technical field
The present invention relates to a kind of geophysical exploration/acoustic detecting well field, particularly relate to a kind of for the novel sound body well logging apparatus of acoustic logging instrument and the Optimal Design Method of novel sound body.
Background technology
At present, acoustic logging not only can provide the petrophysical parameters such as stratum velocity of longitudinal wave, shear wave velocity, modulus of elasticity and poisson's ratio, and provides basic parameter for the reservoir parameters such as degree of porosity, permeability and oil saturation calculate.Transmitting probe is launched acoustic signals and is turned back to multiple receiver probe through different physical property stratum, by probe spacing and receive the acoustic velocity that the stratum Mintrop wave time difference just can obtain different physical property stratum.Will have an impact to normal well logging when taking the lead in through instrument internal direct wave or arrive receiving transducer simultaneously, make measurement result produce error.Need process with acoustic isolater to decay and postponing instrument direct wave, existing many acoustic logging instrument acoustic isolaters generally adopt as shown in Figure 1 outer quarter annular groove mode, also have the cycle in the circumferential adopted as shown in Figure 2 to carve the mode of window.But above-mentioned two kinds of cutting modes are very large to the mechanical impact of apparatus structure itself, flimsy situation in well logging use procedure is caused to occur.Therefore, acoustic isolater meet defening effect good while also want can meet certain mechanical strength, could use after having to pass through strict Mechanical Property Analysis.In patent of the present invention, acoustic isolater well solves the problem of defening effect and mechanical strength.
Summary of the invention
The present invention is directed in prior art mainly exist acoustic logging instrument acoustic isolater adopt outer carve annular groove mode or the circumference upper cycle mode of carving window very large and cause the shortcoming occurred in the flimsy situation of well logging use procedure Instrumental to the mechanical impact of apparatus structure itself, provide the novel sound body well logging apparatus for the acoustic logging instrument combination of a kind of transmitter section acoustic isolater and receiver section acoustic isolater, acoustic isolater arranging insulate against sound interior quarter groove and the groove that insulates against sound outer quarter, there is good defening effect and mechanical strength simultaneously.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
For the novel sound body well logging apparatus of acoustic logging instrument, comprise sound-blocking member, fixedly be located at top connection assembly and the lower contact assembly at sound-blocking member two ends respectively, sound-blocking member comprises transmitting sound-blocking member, receive sound-blocking member, launch sound-blocking member, receive sound-blocking member and be connected to lower contact assembly, on top connection assembly, top connection assembly and lower contact assembly are respectively equipped with the receiving transducer for acoustic receiver and the transmitting transducer for acoustic emission, also comprise two ends respectively with launch sound-blocking member and the middle joint assembly receiving sound-blocking member and be fixedly connected with, launch sound-blocking member and comprise transmitter section acoustic isolater, receive sound-blocking member and comprise receiver section acoustic isolater, penetrate sound-blocking member and receive sound-blocking member combination and effectively add direct wave delay time, also make direct wave amplitude produce certain decay simultaneously.
The internal diameter of receiver section acoustic isolater and external diametrical extent are respectively 15 ~ 35mm and 45 ~ 70mm.
As preferably, transmitter section acoustic isolater is provided with transmitter section sound insulation groove at interior quarter and transmitter section carves sound insulation groove outward, it is 5 ~ 10mm that transmitter section sound insulation groove at interior quarter and transmitter section carve the spacing insulated against sound between groove outward, receiver section acoustic isolater is provided with in receiver section carves sound insulation groove and receiver section carves sound insulation groove outward, and carving sound insulation groove and receiver section in receiver section, to carve the spacing insulated against sound between groove be outward 10 ~ 20mm.
Interior combination of carving sound insulation groove and the groove that insulates against sound outer quarter on acoustic isolater, for decay or delay direct wave, penetrate sound-blocking member and receive sound-blocking member combination and effectively add direct wave delay time, also make direct wave amplitude produce certain decay defening effect simultaneously and obviously improve.
As preferably, transmitter section interior sound insulation at quarter groove, transmitter section carve the groove that insulates against sound quarter in sound insulation groove, receiver section outward, receiver section is carved sound insulation groove outward and is respectively rectangular through-hole groove, annular groove, square hole-shaped through-hole groove, annular groove, carve sound insulation groove in transmitter section and be located at jut circumferential direction between annular groove groove that transmitter section carves sound insulation groove outward, carve sound insulation groove in receiver section and be located at jut circumferential direction between annular groove groove that receiver section carves sound insulation groove outward.
As preferably, carve sound insulation at quarter groove in sound insulation groove, receiver section in transmitter section and be respectively 20 ~ 30 groups, 5 ~ 10 groups, often organize in transmitter section and carve sound insulation groove, the interior sound insulation groove of carving of receiver section is four, form 90 degree of dislocation between sound insulation at quarter groove in adjacent two transmitter sections to arrange, the interior quarter between sound insulation groove of adjacent two receiver sections forms 90 degree of dislocation layouts.
As preferably, the recess width that transmitter section carves sound insulation groove outward, receiver section carves sound insulation groove is outward respectively 5 ~ 20mm, 15 ~ 30mm.
As preferably, carve in transmitter section in sound insulation groove, the interior groove carving sound insulation groove of receiver section and be all filled with sound absorbent rubber.
As preferably, transmitter section acoustic isolater is also provided with transmitter section leather bag, transmitter section leather bag is located in the middle of transmitter section acoustic isolater; Receiver section acoustic isolater is also provided with receiver section leather bag, and receiver section leather bag is located in the middle of receiver section acoustic isolater.
As preferably, middle joint assembly comprises middle crossover sub, middle crossover sub is connected with the first reception holder, first receives holder is connected with the first transmitting Connection Block, transmitter section acoustic isolater is successively by middle crossover sub, first receives holder, first launches Connection Block is connected with receiver section acoustic isolater, transmitter section acoustic isolater is connected with lower contact assembly by transmitter section leather bag adapter, receiver section acoustic isolater is connected with top connection assembly by receiver section leather bag adapter, transmitter section leather bag adapter, receiver section leather bag adapter respectively with transmitter section leather bag, receiver section leather bag connects.
As preferably, top connection assembly comprises the reception Connection Block be located on receiver section leather bag adapter, be located at and receive second on Connection Block and receive holder, the reception dead ring be set on the second reception holder, be set in the reception retainer ring received on dead ring, receive dead ring and compress receiving transducer by receiving retainer ring, be covered with outside receiving transducer and receive entrant sound cover, receive entrant sound cover and be connected with pressure-bearing joint, pressure-bearing joint is provided with crossover sub, lower contact assembly comprises the second transmitting Connection Block be located on transmitter section leather bag adapter, be located at the transmitting holder on the second transmitting Connection Block, be set in the transmitting dead ring launched on holder, be set in the transmitting retainer ring launched on dead ring, launch retainer ring and compress transmitting transducer by transformer holder, transformer holder one end is provided with U-type groove, transmitting transducer is by U-type groove cabling, second launch Connection Block respectively with transmitter section acoustic isolater, receiver section acoustic isolater is to twisting, be covered with outside transmitting transducer and launch entrant sound cover, transformer holder is provided with lower crossover sub.
Defening effect and the mechanical strength of further proof patent sound insulating structure of the present invention can meet the demands, and have carried out numerical simulation and experimental verification to the acoustic logging instrument novel sound body of above-mentioned theory design.
Following finite difference numerical simulation is carried out to the mechanical strength properties of acoustic isolater:
The concrete grammar step that the mechanical strength properties of acoustic isolater carries out following finite difference numerical Analysis is as follows:
A. according to the 3rd strength theory, when acoustic isolater is by pulling force, its failure criteria is:
σ
1-σ
3=σ
s, thus obtain:
The pulling force that acoustic isolater is subject to is maximum carrying pulling force, and strength condition is:
σ
1-σ
3≤[σ]，
Wherein [σ] is material maximum permissible stress.
Utilize finite difference numerical simulation methods analyst, apply certain pulling force and can obtain corresponding Stress Map on acoustic isolater, can obviously be found by Stress Map, on acoustic isolater, dangerous stress point should in cutting groove corner, as long as the maximum stress controlling dangerous spot is less than material maximum permissible stress just can obtain the maximum pull value that acoustic isolater can bear.
Through finite difference numerical simulation, Mechanical Property Analysis is carried out to described patent acoustic isolater of the present invention, obtain the power that maximum pull that acoustic isolater can bear is 80kN about 8 tons of weights.The maximum pull limit that the acoustic isolater that common annular carves groove mode can bear within 2.96 tons, should far not reach the tensile property of patent acoustic isolater of the present invention;
B. acoustic isolater bending resistance is analyzed: be fixed applying fixed support in the middle of described patent acoustic isolater of the present invention, the pulling force in the directions such as size such as two ends applying, and set material and bear maximum permissible stress value, when two ends pulling force reaches 3.9kN, acoustic isolater bends, the maximum stress produced, close to maximum permissible stress value [σ], calculates maximum bending resistance pressure and also will meet strength condition:
σ
1-σ
3≤[σ]，
Obtaining maximum bending resistance force value is 3.9kN about 0.4 ton of weight, and the maximum bending resistance pressure that the acoustic isolater that common annular carves groove mode can bear is 1.5kN about 0.15 ton, does not also reach the anti-bending strength of patent acoustic isolater of the present invention.
In order to the defening effect and mechanical strength that prove patent sound insulating structure of the present invention further can meet the demands, numerical simulation and experimental verification are carried out to the acoustic logging instrument novel sound body of above-mentioned theory design.
Further numerical Analysis is carried out to the mechanical strength properties of acoustic isolater of the present invention.Analyze display: be that stress concentrates maximum place at acoustic isolater cutting groove seamed edge angle, can find out that the maximum pull that acoustic isolater can bear when meeting allowable stress is 80kN about 8.2 tons from analysis result, can meet the requirement of cable acoustic logging completely, and the acoustic isolater giving common cutting mode by Stress Map during pulling force as a comparison.When acoustic isolater two ends pressurized bends, suffered by middle part, stress is maximum, under the condition meeting allowable stress, the bending resistance pressure that sound insulation physical efficiency is born is 3.9kN about 0.4 ton, also can meet the bending resistance requirement of cable acoustic logging, and the Stress Map giving the acoustic isolater bending resistance numerical analysis of common cutting mode as a comparison.
For the Optimal Design Method of the novel sound body of acoustic logging instrument, comprise the steps:
A. setup parameter or variable: the width that definition acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve sound insulation groove is outward respectively d
1and d
2, d
2=β d
1, β is the width ratio coefficient that acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve the groove that insulates against sound outward, and determine β according to engineering practice, the defening effect of acoustic isolater is usually by sound insulation factor
weigh with direct wave delay time τ, the Conventional sound logging instrument defening effect for common cutting mode depends primarily on direct wave delay time τ; Direct wave delay time τ obtains and and d to the time difference between point and wave-wave far away to point by intercepting nearly wave-wave
1, d
2with f, there is correlation;
B. calculate from the quarter-wave of direct wave, with equidistant step delta d constantly increase in acoustic isolater carve sound insulation groove and acoustic isolater carve outward sound insulation groove width, utilize finite difference numerical simulation method to simulate and obtain the array waveform of receiving transducer, to carve the width d that sound insulation groove and acoustic isolater carve sound insulation groove outward in acoustic isolater
1and d
2for union variable, obtain direct wave delay time object function Σ (d as follows
1, d
2):
Wherein, f is frequency, f
1for proposing the initial frequency in respect of effect stopband, f
2for proposing the termination frequency in respect of effect stopband; F (d
1, d
2) be the direct wave delay time correlation function of finite difference numerical simulation;
C. according to object function Σ (d
1, d
2), target function value under utilizing the simulation of finite difference numerical simulation method to obtain each step-length, and utilize least square method to solve to obtain the global maximum of object function, when object function reaches maximum value, corresponding acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve the width value of sound insulation groove outward, carve the width value that sound insulation groove and acoustic isolater carve sound insulation groove outward in the acoustic isolater being optimal combination, thus in acoustic isolater when determining that defening effect is best, sound insulation direct wave delay time is maximum, carve the width value that sound insulation groove and acoustic isolater carve sound insulation groove outward.
The oscillogram testing authentication display that laboratory measurement receiving transducer receives: it is many that this acoustic isolater maximum direct wave delay time τ can reach 1.2ms, and make some high frequency sound wave amplitudes reduce, its sound insulation property can meet the requirement to direct wave delay time τ in cable acoustic logging completely.The direct wave delay time of common cutting acoustic isolater, not only after decay, magnitudes of acoustic waves is large, and direct wave delay time τ only has about 0.4ms.
The present invention, owing to have employed above technical scheme, has following significant technique effect:
(1) in structure, novel sound body of the present invention comprises sound-blocking member and upper, middle and lower coupling assembling, and sound-blocking member comprises acoustic isolater, leather bag, sound absorption material, crossover sub, and overall structure is simple, reasonable in design.
(2) the interior combination of carving sound insulation groove and the groove that insulates against sound outer quarter on acoustic isolater, for decay or delay direct wave, penetrate sound-blocking member and receive sound-blocking member combination and effectively add direct wave delay time, also make direct wave amplitude produce certain decay defening effect simultaneously and obviously improve.
(3) in the design of defening effect, introduce numerical simulation finite element analysis technology, analyze defening effect and the mechanical strength of acoustic isolater more accurately, Binding experiment, can sustain mechanical force when ensure that instrument works simultaneously.
In sum, the present invention adopts the combination of transmitter section acoustic isolater and receiver section acoustic isolater, by acoustic isolater is arranged interior quarter sound insulation groove and insulate against sound outer quarter groove for decay or postpone direct wave, acoustic isolater can realize good time delay defening effect in wider frequency range, and the safety of logger can be ensured preferably when hole condition is bad, this device overall structure is simple, reasonable in design, is conducive to promoting the use of.
Accompanying drawing explanation
Fig. 1 is existing a kind of outer circumference 180 degree of deployed configuration schematic diagrames carving the acoustic isolater of annular groove separately.
Fig. 2 is the circumference 180 degree of deployed configuration schematic diagrames existing a kind of independent circumference cycle carving the acoustic isolater of window.
Fig. 3 is the overall structure schematic diagram of the present invention for the novel sound body well logging apparatus embodiment of acoustic logging instrument.
Fig. 4 is the structural representation of top connection Assemblies Example of the present invention.
Fig. 5 is the structural representation of receiver section acoustic isolater embodiment of the present invention.
Fig. 6 is the structural representation of middle joint Assemblies Example of the present invention.
Fig. 7 is the structural representation of transmitter section acoustic isolater embodiment of the present invention.
Fig. 8 is the structural representation of lower contact Assemblies Example of the present invention.
Fig. 9 is the oscillogram that acoustic isolater of the present invention is measured by experiment.
Figure 10 is the stress envelope that acoustic isolater tension of the present invention is analyzed.
Figure 11 is the Stress Map that acoustic isolater bending resistance of the present invention is analyzed.
Figure 12 is the Stress Map that acoustic isolater of the present invention carries out bending resistance numerical analysis.
Figure 13 is that the acoustic isolater of common cutting mode is by Stress Map during pulling force.
Figure 14 is the Stress Map of the acoustic isolater bending resistance numerical analysis of common cutting mode.
The toponym that in accompanying drawing, each number designation refers to is as follows: 1-upper crossover sub, 2-pressure-bearing joint, 3-receive entrant sound cover, 4-receive Connection Block, 5-receiver section leather bag adapter, 6-receiver section acoustic isolater, 7-the first launches Connection Block, 8-middle crossover sub, 9-transmitter section acoustic isolater, 10-launch entrant sound cover, 11-lower crossover sub, 12-transmitter section leather bag, 13-receiver section leather bag, 14-the first receives holder, 15-transmitter section leather bag adapter, 16-the second receives holder, 17-receive retainer ring, 18-receive dead ring, 19-receiving transducer, 20-the second launches Connection Block, 21-launch holder, 22-launch dead ring, 23-launch retainer ring, 24-transformer holder, 25-transmitting transducer, sound insulation groove is carved in 61-receiver section, 62-receiver section carves sound insulation groove outward, sound insulation groove is carved in 91-transmitter section, 92-transmitter section carves sound insulation groove outward, 240-U-type groove.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Embodiment 1
For the novel sound body well logging apparatus of acoustic logging instrument, as shown in figures 3-8, comprise sound-blocking member, fixedly be located at top connection assembly and the lower contact assembly at sound-blocking member two ends respectively, sound-blocking member comprises transmitting sound-blocking member, receive sound-blocking member, launch sound-blocking member, receive sound-blocking member and be connected to lower contact assembly, on top connection assembly, top connection assembly and lower contact assembly are respectively equipped with the receiving transducer 19 for acoustic receiver and the transmitting transducer 25 for acoustic emission, also comprise two ends respectively with launch sound-blocking member and the middle joint assembly receiving sound-blocking member and be fixedly connected with, launch sound-blocking member and comprise transmitter section acoustic isolater 9, receive sound-blocking member and comprise receiver section acoustic isolater 6, sound insulation frequency band is widened in the combination of transmitter section acoustic isolater 9 and receiver section acoustic isolater 6.
Transmitter section acoustic isolater 9 is provided with transmitter section sound insulation groove 91 at interior quarter and transmitter section carves sound insulation groove 92 outward, it is 5 ~ 10mm that transmitter section sound insulation groove 91 at interior quarter and transmitter section carve the spacing insulated against sound between groove 92 outward, receiver section acoustic isolater 6 is provided with in receiver section carves sound insulation groove 61 and receiver section carves sound insulation groove 62 outward, and carving sound insulation groove 61 and receiver section in receiver section, to carve the spacing insulated against sound between groove 62 be outward 10 ~ 20mm.
Transmitter section interior sound insulation at quarter groove 91, transmitter section carve the groove 61 that insulates against sound quarter in sound insulation groove 92, receiver section outward, receiver section is carved sound insulation groove 62 outward and is respectively rectangular through-hole groove, annular groove, square hole-shaped through-hole groove, annular groove, carve sound insulation groove 91 in transmitter section and be located at jut circumferential direction between annular groove groove that transmitter section carves sound insulation groove 92 outward, carve sound insulation groove 61 in receiver section and be located at jut circumferential direction between annular groove groove that receiver section carves sound insulation groove 62 outward.
Carve sound insulation at quarter groove 61 in sound insulation groove 91, receiver section in transmitter section and be respectively 24 groups, five groups, often organize in transmitter section and carve sound insulation groove 91, the interior sound insulation groove 61 of carving of receiver section is four, form 90 degree of dislocation between sound insulation at quarter groove 91 in adjacent two transmitter sections to arrange, the interior quarter between sound insulation groove 61 of adjacent two receiver sections forms 90 degree of dislocation layouts.
The recess width that transmitter section carves sound insulation groove 92 outward, receiver section carves sound insulation groove 62 is outward respectively 5 ~ 20mm, 15 ~ 30mm.
Carve in transmitter section in sound insulation groove 91, the interior groove carving sound insulation groove 61 of receiver section and be all filled with sound absorbent rubber.
Transmitter section acoustic isolater 9 is also provided with transmitter section leather bag 12, and transmitter section leather bag 12 is located in the middle of transmitter section acoustic isolater 9; Receiver section acoustic isolater 6 is also provided with receiver section leather bag 13, and receiver section leather bag 13 is located in the middle of receiver section acoustic isolater 6.
Middle joint assembly comprises middle crossover sub 8, middle crossover sub 8 is connected with the first reception holder 14, first receives holder 14 is connected with the first transmitting Connection Block 7, transmitter section acoustic isolater 9 is successively by middle crossover sub 8, first receives holder 14, first launches Connection Block 7 is connected with receiver section acoustic isolater 6, transmitter section acoustic isolater 9 is connected with lower contact assembly by transmitter section leather bag adapter 15, receiver section acoustic isolater 6 is connected with top connection assembly by receiver section leather bag adapter 5, transmitter section leather bag adapter 15, receiver section leather bag adapter 5 respectively with transmitter section leather bag 12, receiver section leather bag 13 connects.
Top connection assembly comprises the reception Connection Block 4 be located on receiver section leather bag adapter 5, be located at and receive second on Connection Block 4 and receive holder 16, the reception dead ring 18 be set on the second reception holder 16, be set in the reception retainer ring 17 received on dead ring 18, receive dead ring 18 and compress receiving transducer 19 by receiving retainer ring 17, be covered with outside receiving transducer 19 and receive entrant sound cover 3, receive entrant sound cover 3 and be connected with pressure-bearing joint 2, pressure-bearing joint 2 is provided with crossover sub 1, lower contact assembly comprises the second transmitting Connection Block 20 be located on transmitter section leather bag adapter 15, be located at the transmitting holder 21 on the second transmitting Connection Block 20, be set in the transmitting dead ring 22 launched on holder 21, be set in the transmitting retainer ring 23 launched on dead ring 22, launch retainer ring 23 and compress transmitting transducer 25 by transformer holder 24, transformer holder 24 one end is provided with U-type groove 240, transmitting transducer 25 is by U-type groove 240 cabling, second launch Connection Block 20 respectively with transmitter section acoustic isolater 9, receiver section acoustic isolater 6 is to twisting, be covered with outside transmitting transducer 25 and launch entrant sound cover 10, transformer holder 24 is provided with lower crossover sub 11.
The internal diameter of receiver section acoustic isolater and external diametrical extent are respectively 15 ~ 35mm and 45 ~ 70mm.Carve sound insulation at quarter groove in sound insulation groove, receiver section in transmitter section and be respectively 20 ~ 30 groups, 5 ~ 10 groups, often organize in transmitter section and carve sound insulation groove, the interior sound insulation groove of carving of receiver section is four, form 90 degree of dislocation between sound insulation at quarter groove in adjacent two transmitter sections to arrange, the interior quarter between sound insulation groove of adjacent two receiver sections forms 90 degree of dislocation layouts.
Following finite difference numerical simulation is carried out to the mechanical strength properties of acoustic isolater:
The concrete grammar step that the mechanical strength properties of acoustic isolater carries out following finite difference numerical Analysis is as follows:
A. according to the 3rd strength theory, when acoustic isolater is by pulling force, its failure criteria is:
σ
1-σ
3=σ
s, thus obtain:
The pulling force that acoustic isolater is subject to is maximum carrying pulling force, and strength condition is:
σ
1-σ
3≤[σ]，
Wherein [σ] is material maximum permissible stress.
Utilize finite difference numerical simulation methods analyst, apply certain pulling force and can obtain corresponding Stress Map on acoustic isolater, can obviously be found by Stress Map, on acoustic isolater, dangerous stress point should in cutting groove corner, as long as the maximum stress controlling dangerous spot is less than material maximum permissible stress just can obtain the maximum pull value that acoustic isolater can bear.
Mechanical Property Analysis is carried out through patent acoustic isolater of the present invention described in finite difference numerical simulation, obtaining the maximum pull that acoustic isolater can bear is that the power of 80kN about 8 tons of weights is as Figure 11, the maximum pull limit that the acoustic isolater of common cutting mode as shown in Figure 2 can bear should within 2.96 tons, stressed cloud atlas, as Figure 13, does not far reach the tensile property of patent acoustic isolater of the present invention;
B. acoustic isolater bending resistance is analyzed: in the middle of acoustic isolater, apply fixed support be fixed, the pulling force in the directions such as size such as two ends applying, and set material and bear maximum permissible stress value, when two ends pulling force reaches 3.9kN, acoustic isolater bends, the maximum stress produced, close to maximum permissible stress value [σ], calculates maximum Bending tension and also will meet strength condition:
σ
1-σ
3≤[σ]，
Obtaining maximum Bending tension value is that 3.9kN about 0.4 ton of weight is as Figure 12, the maximum bending resistance pressure that the acoustic isolater that common annular as shown in Figure 2 carves groove mode can bear is 1.5kN about 0.15 ton, stressed cloud atlas, as Figure 14, does not reach the anti-bending strength of patent acoustic isolater of the present invention yet.
In order to the defening effect and mechanical strength that prove patent sound insulating structure of the present invention further can meet the demands, numerical simulation and experimental verification are carried out to the acoustic logging instrument novel sound body of above-mentioned theory design.
Further numerical Analysis is carried out to the mechanical strength properties of acoustic isolater of the present invention.Figure 11 gives acoustic isolater of the present invention by Stress Map during pulling force, as can be seen from Figure 11: be that stress concentrates maximum place at acoustic isolater cutting groove seamed edge angle, can finding out that the maximum pull that acoustic isolater can bear when meeting allowable stress is 80kN about 8.2 tons from analysis result, the requirement of cable acoustic logging can be met completely.Figure 13 gives the acoustic isolater of common cutting mode by Stress Map during pulling force as a comparison.Figure 12 gives the Stress Map that acoustic isolater of the present invention carries out bending resistance numerical analysis, when acoustic isolater two ends pressurized bends, suffered by middle part, stress is maximum, under the condition meeting allowable stress, the bending resistance pressure that sound insulation physical efficiency is born is 3.9kN about 0.4 ton, also can meet the bending resistance requirement of cable acoustic logging.Figure 14 gives the Stress Map of the acoustic isolater bending resistance numerical analysis of common cutting mode as a comparison.
For the Optimal Design Method of the novel sound body of acoustic logging instrument, comprise the steps:
A. setup parameter or variable: the width that definition acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve sound insulation groove is outward respectively d
1and d
2, d
2=β d
1, β is the width ratio coefficient that acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve the groove that insulates against sound outward, and determine β according to engineering practice, the defening effect of acoustic isolater is usually by sound insulation factor
weigh with direct wave delay time τ, the Conventional sound logging instrument defening effect for cutting mode as shown in Figure 2 depends primarily on direct wave delay time τ; Direct wave delay time τ obtains and and d to the time difference between point and wave-wave far away to point by intercepting nearly wave-wave
1, d
2with f, there is correlation;
B. calculate from the quarter-wave of direct wave, with equidistant step delta d constantly increase in acoustic isolater carve sound insulation groove and acoustic isolater carve outward sound insulation groove width, utilize finite difference numerical simulation method to simulate and obtain the array waveform of receiving transducer, to carve the width d that sound insulation groove and acoustic isolater carve sound insulation groove outward in acoustic isolater
1and d
2for union variable, obtain the object function Σ (d of direct wave delay time τ as follows
1, d
2):
Wherein, f is frequency, f
1for proposing the initial frequency in respect of effect stopband, f
2for proposing the termination frequency in respect of effect stopband; F (d
1, d
2) be the direct wave delay time correlation function of finite difference numerical simulation;
C. according to object function Σ (d
1, d
2), target function value under utilizing the simulation of finite difference numerical simulation method to obtain each step-length, and utilize least square method to solve to obtain the global maximum of object function, when object function reaches maximum value, corresponding acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve the width value of sound insulation groove outward, carve the width value that sound insulation groove and acoustic isolater carve sound insulation groove outward in the acoustic isolater being optimal combination, thus in acoustic isolater when determining that defening effect is best, sound insulation direct wave delay time τ is maximum, carve the width value that sound insulation groove and acoustic isolater carve sound insulation groove outward.
As shown in Figure 9, be the oscillogram that patent acoustic isolater laboratory measurement receiving transducer of the present invention receives, as can be seen from Figure 91,3 two waveform is the waveform that upper end receiving transducer and stage casing receiving transducer receive respectively.Experimental test verification shows: the maximum direct wave delay time of this acoustic isolater can reach 1.2ms, and has filtered some high frequency sound waves and direct wave amplitude is reduced, and can meet the requirement to direct wave delay time in cable acoustic logging completely.The oscillogram that in Fig. 2, the cutting pattern acoustic isolater of acoustic isolater goes out in laboratory measurement as shown in Figure 10, by Figure 10 and Fig. 9 is compared discovery: by the direct wave of common cutting mode acoustic isolater, not only magnitudes of acoustic waves is large, and direct wave delay time only has about 0.4ms.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. for the novel sound body well logging apparatus of acoustic logging instrument, comprise sound-blocking member, fixedly be located at top connection assembly and the lower contact assembly at sound-blocking member two ends respectively, sound-blocking member comprises transmitting sound-blocking member, receive sound-blocking member, launch sound-blocking member, receive sound-blocking member and be connected to lower contact assembly, on top connection assembly, top connection assembly and lower contact assembly are respectively equipped with the receiving transducer (19) for acoustic receiver and the transmitting transducer (25) for acoustic emission, it is characterized in that: also comprise two ends respectively with launch sound-blocking member and the middle joint assembly receiving sound-blocking member and be fixedly connected with, launch sound-blocking member and comprise transmitter section acoustic isolater (9), receive sound-blocking member and comprise receiver section acoustic isolater (6), the combination of transmitter section acoustic isolater (9) and receiver section acoustic isolater (6) effectively adds direct wave delay time, also make direct wave amplitude produce certain decay simultaneously.
2. the novel sound body well logging apparatus for acoustic logging instrument according to claim 1, it is characterized in that: transmitter section acoustic isolater (9) is provided with sound insulation groove at quarter (91) and transmitter section in transmitter section and carves sound insulation groove (92) outward, in transmitter section, sound insulation groove at quarter (91) and transmitter section carve the spacing insulated against sound between groove (92) is outward 5 ~ 10mm, receiver section acoustic isolater (6) is provided with sound insulation groove at quarter (61) and receiver section in receiver section and carves sound insulation groove (62) outward, in receiver section, sound insulation groove at quarter (61) and receiver section carve the spacing insulated against sound between groove (62) is outward 10 ~ 20mm.
3. the novel sound body well logging apparatus for acoustic logging instrument according to claim 2, it is characterized in that: in transmitter section, carve sound insulation groove (91), transmitter section carves sound insulation groove (92) outward, sound insulation groove (61) is carved in receiver section, receiver section is carved sound insulation groove (62) outward and is respectively rectangular through-hole groove, annular groove, square hole-shaped through-hole groove, annular groove, carve sound insulation groove (91) in transmitter section and be located at jut circumferential direction between annular groove groove that transmitter section carves sound insulation groove (92) outward, carve sound insulation groove (61) in receiver section and be located at jut circumferential direction between annular groove groove that receiver section carves sound insulation groove (62) outward.
4. the novel sound body well logging apparatus for acoustic logging instrument according to Claims 2 or 3, it is characterized in that: carve in transmitter section and be respectively 20 ~ 30 groups, 5 ~ 10 groups sound insulation groove at quarter (61) in sound insulation groove (91), receiver section, often organize interior sound insulation groove at the quarter (91) of transmitter section, the interior groove (61) that insulates against sound of carving of receiver section is four, form 90 degree of dislocation in adjacent two transmitter sections between sound insulation groove at quarter (91) to arrange, the interior quarter between sound insulation groove (61) of adjacent two receiver sections forms 90 degree of dislocation layouts.
5. the novel sound body well logging apparatus for acoustic logging instrument according to Claims 2 or 3, is characterized in that: the recess width that transmitter section carves sound insulation groove (92) outward, receiver section carves sound insulation groove (62) is outward respectively 5 ~ 20mm, 15 ~ 30mm.
6. the novel sound body well logging apparatus for acoustic logging instrument according to Claims 2 or 3, is characterized in that: carve in the groove carving sound insulation groove (61) in sound insulation groove (91), receiver section in transmitter section and be all filled with sound absorbent rubber.
7. the novel sound body well logging apparatus for acoustic logging instrument according to claim 1 and 2, it is characterized in that: transmitter section acoustic isolater (9) is also provided with transmitter section leather bag (12), transmitter section leather bag (12) is located in the middle of transmitter section acoustic isolater (9); Receiver section acoustic isolater (6) is also provided with receiver section leather bag (13), receiver section leather bag (13) is located in the middle of receiver section acoustic isolater (6).
8. the novel sound body well logging apparatus for acoustic logging instrument according to claim 1, it is characterized in that: middle joint assembly comprises middle crossover sub (8), middle crossover sub (8) is connected with the first reception holder (14), first receives holder (14) is connected with the first transmitting Connection Block (7), transmitter section acoustic isolater (9) is successively by middle crossover sub (8), first receives holder (14), first launches Connection Block (7) is connected with receiver section acoustic isolater (6), transmitter section acoustic isolater (9) is connected with lower contact assembly by transmitter section leather bag adapter (15), receiver section acoustic isolater (6) is connected with top connection assembly by receiver section leather bag adapter (5), transmitter section leather bag adapter (15), receiver section leather bag adapter (5) respectively with transmitter section leather bag (12), receiver section leather bag (13) connects.
9. the novel sound body well logging apparatus for acoustic logging instrument according to claim 1, it is characterized in that: top connection assembly comprises the reception Connection Block (4) be located on receiver section leather bag adapter (5), be located at the second reception holder (16) received on Connection Block (4), be set in the reception dead ring (18) on the second reception holder (16), be set in the reception retainer ring (17) received on dead ring (18), receive dead ring (18) and compress receiving transducer (19) by receiving retainer ring (17), be covered with outside receiving transducer (19) and receive entrant sound cover (3), receive entrant sound cover (3) and be connected with pressure-bearing joint (2), pressure-bearing joint (2) is provided with crossover sub (1), lower contact assembly comprises the second transmitting Connection Block (20) be located on transmitter section leather bag adapter (15), be located at the transmitting holder (21) on the second transmitting Connection Block (20), be set in the transmitting dead ring (22) launched on holder (21), be set in the transmitting retainer ring (23) launched on dead ring (22), launch retainer ring (23) and compress transmitting transducer (25) by transformer holder (24), transformer holder (24) one end is provided with U-type groove (240), transmitting transducer (25) is by U-type groove (240) cabling, second launch Connection Block (20) respectively with transmitter section acoustic isolater (9), receiver section acoustic isolater (6) is to twisting, be covered with outside transmitting transducer (25) and launch entrant sound cover (10), transformer holder (24) is provided with lower crossover sub (11).
10., for the Optimal Design Method of the novel sound body of acoustic logging instrument, it is characterized in that: comprise the steps:
A. setup parameter or variable: the width that definition acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve sound insulation groove is outward respectively d
1and d
2, d
2=β d
1, β is the width ratio coefficient that acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve the groove that insulates against sound outward, and determine β according to engineering practice, the defening effect of acoustic isolater is usually by sound insulation factor
weigh with direct wave delay time τ, direct wave delay time τ obtains and and d to the time difference between point and wave-wave far away to point by intercepting nearly wave-wave
1, d
2with f, there is correlation;
B. calculate from the quarter-wave of direct wave, with equidistant step delta d constantly increase in acoustic isolater carve sound insulation groove and acoustic isolater carve outward sound insulation groove width, utilize finite difference numerical simulation method to simulate and obtain the array waveform of receiving transducer, to carve the width d that sound insulation groove and acoustic isolater carve sound insulation groove outward in acoustic isolater
1and d
2for union variable, obtain the object function Σ (d of direct wave delay time τ as follows
1, d
2):
Wherein, f is frequency, f
1for proposing the initial frequency in respect of effect stopband, f
2for proposing the termination frequency in respect of effect stopband, F (d
1, d
2) be the direct wave delay time correlation function of finite difference numerical simulation;
C. according to object function Σ (d
1, d
2), target function value under utilizing the simulation of finite difference numerical simulation method to obtain each step-length, and utilize least square method to solve to obtain the global maximum of object function, when object function reaches maximum value, corresponding acoustic isolater sound insulation groove at interior quarter and acoustic isolater carve the width value of sound insulation groove outward, carve the width value that sound insulation groove and acoustic isolater carve sound insulation groove outward in the acoustic isolater being optimal combination, thus in acoustic isolater when determining that defening effect is best, sound insulation direct wave delay time is maximum, carve the width value that sound insulation groove and acoustic isolater carve sound insulation groove outward.
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| CN104712324B (en) | 2018-01-19 |
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Denomination of invention: Novel sound insulator well logging device for acoustic logging instrument and optimization design method Effective date of registration: 20181214 Granted publication date: 20180119 Pledgee: Hangzhou United Rural Commercial Bank, Limited by Share Ltd branch of science and technology Pledgor: HANGZHOU FENGHE PETROLEUM TECHNOLOGY CO., LTD. Registration number: 2018330000471 |