WO2009002204A1 - Arrangement for low frequency wave effect on the perforation zone of the well casting pipe - Google Patents
Arrangement for low frequency wave effect on the perforation zone of the well casting pipe Download PDFInfo
- Publication number
- WO2009002204A1 WO2009002204A1 PCT/RU2007/000344 RU2007000344W WO2009002204A1 WO 2009002204 A1 WO2009002204 A1 WO 2009002204A1 RU 2007000344 W RU2007000344 W RU 2007000344W WO 2009002204 A1 WO2009002204 A1 WO 2009002204A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- emitter
- arrangement
- waveguides
- cylindrical
- sonic
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/003—Vibrating earth formations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
Definitions
- the invention refers to the extractive industry and can be used when mining oil and gas fields and water and ore well cleaning.
- the arrangement belongs to the device group for the wave vibroacoustic effect and can be used for exploiting within the casting pipe in the perforation zone of the working area.
- Deficiencies of the known arrangements are as follows: large dimensions and big weight, low impact efficiency on the well working area combined with a small radius of the vibroacoustic effect.
- the device for low frequency wave effect consisting of sonic transmitter with passive back plate in the hermetic enclosure, active emitting plate in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure, as well as at least one metallic reflector with flat surfaces parallel to the flat surfaces of the active emitting plate that can be moved along the arrangement axis and fixed in the predefined position (RU Ne 2263203, 2005, prototype).
- Deficiencies of this arrangement are as follows: large dimensions and big weight, low impact efficiency on the well working area due to small radius of the vibroacoustic effect caused by high frequency of the emanation.
- This known arrangement is produced and effectively used for low frequency wave effect on the perforation zone and productive oil stratum at the fields in Tatarstan at Tat-RITEK-Oil in June - July 2005 (producing well Ns2576) and October - December 2006 (wells: producing N°N°2567,3609, injector Ns2504).
- the arrangement is 2.5 m long and has the outer diameter of hermetic enclosure of 70 mm and inner diameter of
- the diameter of the central rod consisting of piezoelectric ceramics or magnetostrictive material shall not exceed 70 mm.
- Working resonance frequency reduction till 175 Hz without design amendments would require fourfold extension of this arrangement part length, i.e. up to ⁇ 10 meter.
- Technical objective of this invention is to create efficient arrangement for low frequency wave effect on the perforation zone of the casting pipe well and to widen devices inventory for low frequency effect on the perforation zone of the well casting pipe.
- This objective is technically achieved by reducing resonance frequency of the wave effect and increasing the vibroaccoustic effect radius and decreasing arrangement dimensions.
- arrangement for low frequency wave effect includes sonic emitter with passive back plate in the hermetic enclosure, active emitting plate in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure, as well as at least one metallic reflector with flat surfaces parallel to the flat surfaces of the active emitting plate that can be moved along the arrangement axis and fixed in the predefined position, sonic emitter is equipped with two metallic conic concentrators positioned at both sides of the emitter, and two cylindrical bimetallic rib waveguides, at that each concentrator at one end is connected with the emitter and at the other end - with the end of one of the bimetallic rib waveguides, and each of the waveguides is produced as a cylindrical rod with the ribs in form of washers (ribs) equally distributed along its length, the other end of one of the waveguides is connected with passive plate of the emitter, and the other waveguide end - with active plate of the emitter.
- sonic emitter is equipped with two metallic
- the sonic emitter is designed as a cylindrical piezoelectric ceramic element or the sonic emitter can include at least two cylindrical piezoelectric ceramic elements connected through symmetrising connecting sleeve, or the sonic transmitter is designed as a cylindrical magnetostrictive element, or the sonic transmitter can include at least two cylindrical magnetostrictive elements connected through symmetrising connecting sleeve.
- waveguides rods 6,7 are provided with thread for mounting washers made of the material that is heavier than the rod material
- waveguides rods can be made of the following materials - aluminium alloy , titan - and the washer mounted on the waveguides 6,7, can be produced from the following materials: brass, copper, steel.
- Arrangement for low frequency wave effect includes sonic emitter that can be designed in form of cylindrical piezoelectric ceramic element or in form of at least two cylindrical piezoelectric ceramic elements connected through symmetrising connecting sleeve, or as a cylindrical magnetostrictive element, or as at least two cylindrical magnetostrictive elements connected through symmetrising connecting sleeve.
- Fig.1 shows the arrangement, in which the emitter is designed as two cylindrical piezoelectric ceramic or magnetostrictive elements 1 ,2 connected through symmetrising connecting sleeve 3.
- the emitter is connected with the passive back plate 9 and positioned in the hermetic enclosure consisting of two parts 10,11. Through the sealed connector 12 the cable 13 is connected with arrangements.
- Arrangement also includes active emitting plate 8 in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure 10,11 , as well as at least one metallic reflector 15 with flat surfaces parallel to the flat surfaces of the active emitting plate 8 that can be moved along the arrangement axis and fixed in the predefined position.
- the emitter 15 is mounted on the carrier 14.
- the sonic emitter is equipped with two matching metallic conic concentrators 4,5 positioned at both sides of the emitter, and two cylindrical bimetallic rib waveguides 6,7. Each concentrator 4,5 at one end is connected with the emitter and at the other end - with the end of one of the bimetallic rib waveguides 6,7.
- Each of the waveguides 6,7 is produced as a cylindrical rod with the ribs in form of washers (ribs) 17 equally distributed along its length.
- Bimetallic waveguides 6,7 are named so because their rods and washers 17 are produced from two metals essentially differing by their physical properties.
- the other waveguide end 6 is connected with passive plate 9 of the emitter, and the other waveguide end 7 - with active plate 8 of the emitter.
- Waveguides rods 6,7 are provided with thread for mounting washers 16 made of the material that is heavier than the rod material.
- Waveguides rods 6,7 can be made of the following materials - aluminium alloy , titan - and the washer 17 mounted on the waveguides 6,7, can be produced from the following materials: brass, copper, steel.
- Washer 17 configuration is chosen to achieve maximum value of the local mass around its perimeter and maximum waveguides 6,7 compressibility. The arrangement is located in the holes 18 zone (perforation) of the casting pipe 16.
- Fig. 1 shows: ⁇ - oscillatory shift, q - linear dimension of the waveguide passive part 6, a - linear dimensions of the waveguide active part 7, L - passive plate length, b - active plate length, fig. 2 shows: m - rib (washer) weight, 17, c - material compressibility of the waveguide section 6,7.
- the arrangement is sunk in the casting pipe 16 on the cable 13 into the perforation zone of the holes 18.
- Stimulating voltage in the area of the emitter resonance frequency is transferred over the cable 13 to the emitter 1 ,2.
- Sleeve 3 ensures equal resilience on both sides of the emitter 1 ,2.
- Active emitting plate 8 emits acoustic vibrations in phase opposition to the upper und lower flat surfaces in the opposite directions.
- Passive plate 9 creates arrangement symmetry in relation to central cross-section.
- Two metallic conic concentrators 4,5 positioned at both sides of the emitter 1 ,2 adjust emitter load through waveguides 6,7 with plates 8,9.
- the present invention is embodied with multipurpose equipment extensively employed by the industry.
Abstract
Arrangement for low frequency wave effect consisting of sonic emitter in form of two cylindrical piezoelectric ceramic or magnetostrictive elements 1,2 connected through symmetrising connecting sleeve 3. The emitter is connected with the passive back plate 9 and positioned in the hermetic enclosure consisting of two parts 10, 11. The arrangements includes active emitting plate 8 in form of a disc with two flat emitting surfaces perpendicular to the long axis of the arrangement located outside the hermetic enclosure, as well as at least one metallic reflector 15 with flat surfaces parallel to the flat surfaces of the active emitting plate 8 that can be moved along the arrangement axis and fixed in the predefined position. The emitter 15 is mounted on the carrier 14. Sonic emitter is equipped with two matching metallic conic concentrators 4, 5, positioned at both sides of the emitter, and two cylindrical bimetallic rib waveguides 6, 7. Each of the concentrators 4, 5 at one end is connected with the emitter and at the second end - with the end of one of the bimetallic rib waveguides 6, 7. Each of the waveguides 6, 7 is made as a cylindrical rod with ribs in form of washers (ribs) 17 distributed uniformly along its length. At that, resonance frequency of the wave effect is reduced, the vibroacoustic effect radius is increased, and arrangement dimensions are decreased.
Description
Arrangement for Low Frequency Wave Effect on the Perforation Zone of the Well Casting Pipe
Description Field of the Invention
The invention refers to the extractive industry and can be used when mining oil and gas fields and water and ore well cleaning. The arrangement belongs to the device group for the wave vibroacoustic effect and can be used for exploiting within the casting pipe in the perforation zone of the working area.
Prior Art
In the industry various methods and arrangements are known that create mechanical effect on the perforation zone of the casting pipe and oil stratum located behind it. (RU 2129659, RU 2161244, RU 2047280, RU 2192651 , RU 2055979, SU 1402991 , SU 1402991 , WO 96/12409, US 5727628, US 4184562, US 4469175).
Deficiencies of the known arrangements are as follows: large dimensions and big weight, low impact efficiency on the well working area combined with a small radius of the vibroacoustic effect. Most similar to the declared arrangement is the device for low frequency wave effect consisting of sonic transmitter with passive back plate in the hermetic enclosure, active emitting plate in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure, as well as at least one metallic reflector with flat surfaces parallel to the flat surfaces of the active emitting plate that can be moved along the arrangement axis and fixed in the predefined position (RU Ne 2263203, 2005, prototype).
Deficiencies of this arrangement are as follows: large dimensions and big weight, low impact efficiency on the well working area due to small radius of the vibroacoustic effect caused by high frequency of the emanation.
This known arrangement is produced and effectively used for low frequency wave effect on the perforation zone and productive oil stratum at the fields in Tatarstan at Tat-RITEK-Oil in June - July 2005 (producing well Ns2576) and October - December 2006 (wells: producing N°N°2567,3609, injector Ns2504). The arrangement is 2.5 m long and has the outer diameter of hermetic enclosure of 70 mm and inner diameter of
50 mm. It has the central section consisting of piezoelectric ceramic elements and round duralumin rods. Working frequency band of this arrangement amounts to approximately 600÷800 Hz. For increasing the radius of the vibroacoustic effect on the productive stratum further reduction of the working resonance frequency is required. Equations for calculating emitter with the diagram corresponding to the prototype arrangement are provided in numerous scientific studies referring to creation of hydroacoustic antennas, see for example «Underwater Acoustics* by Kamp L., M, Mir, 1972., p. 50-56; as well as the textbook « Hydroacoustic Transformers and Antennas» Sverdlin G. M.,
L. Sudostroyenye, 1988.
Resonance frequency is calculated based on one of the following equations: tgk2 tgk3b=Zm2/ Zm3 or tgk2qtgkiL= Zm2/ Zm1, where: kr wave number in the environmenti . ki=2π/λ1=2ττfp/c1; k2- wave number in the environment2. k2=2τr/λ2=2π fp/c2; k3- wave number in the environments. k3=2τr/λ3=2π fp /c3; fp- working resonance frequency Zi, Z2, Z3 - mechanical impedance, accordingly equal to, piCiSi, P2C2S2,
P3C3S3. c- propagation speed of sound vibrations in the environments 1 ,2,3. Si, S2, S3,- sectional area of the elements 1 ,2, and 3. Pi, P2, P3,- area of the environments 1 ,2,3, respectively The analysis shows that reduction of working resonance frequency can be realized mainly by increasing the length of the vibrator middle (central) section. The same effect can be achieved by reducing central
section hardness by decreasing its cross-section or by choosing soft materials with smaller Young modulus. This leads to decrease of the relation Zm2/ Zm3 or Zm2/ ZITH .
On the practical level these possibilities are very limited. As a material for the plates only metals can be used. (In practice this is steel only). Inner diameters of the working casting pipe amounts to 5÷6 inches, i.e. 127÷152 mm.
Taking into account the hermetic enclosure thickness, the diameter of the central rod consisting of piezoelectric ceramics or magnetostrictive material shall not exceed 70 mm. Working resonance frequency reduction till 175 Hz without design amendments would require fourfold extension of this arrangement part length, i.e. up to ~ 10 meter.
It is inexpedient to make central section thin as the emitter mechanical strength may be deteriorated. Thus essential reduction of this sonic emitter working frequency is practically impossible, as this is associated with unacceptable increase of its dimensions, particularly, with the increase of its length.
Summary of the Invention
Technical objective of this invention is to create efficient arrangement for low frequency wave effect on the perforation zone of the casting pipe well and to widen devices inventory for low frequency effect on the perforation zone of the well casting pipe.
This objective is technically achieved by reducing resonance frequency of the wave effect and increasing the vibroaccoustic effect radius and decreasing arrangement dimensions.
Physical preconditions for the solving this technical objective are as follows: absorption of the elastic vibrations created by the emitter is reduced in the earthly environment with the reduction of vibration frequency. Therefore to increase the radius of effective vobroacoustic effect on the productive stratum further reduction of working frequency is required. Calculation of vibroacoustic effect in earthly environment is provided for example in monograph «Basic Physics of vibration and
acoustic effect on oil and gas stratums». Kusnetsov O.L, Silkin E. M., Chilingar J., M, «Mir», 2001. This monograph shows that stimulation of natural frequencies in productive stratum in the range 90÷200 Hz is possible and expedient and that this leads to the maximum increase from oil or gas recovery of the productive stratum. Specific optimum value of the working frequency depends on the stratum strength.
The essence of the invention is as follows: arrangement for low frequency wave effect includes sonic emitter with passive back plate in the hermetic enclosure, active emitting plate in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure, as well as at least one metallic reflector with flat surfaces parallel to the flat surfaces of the active emitting plate that can be moved along the arrangement axis and fixed in the predefined position, sonic emitter is equipped with two metallic conic concentrators positioned at both sides of the emitter, and two cylindrical bimetallic rib waveguides, at that each concentrator at one end is connected with the emitter and at the other end - with the end of one of the bimetallic rib waveguides, and each of the waveguides is produced as a cylindrical rod with the ribs in form of washers (ribs) equally distributed along its length, the other end of one of the waveguides is connected with passive plate of the emitter, and the other waveguide end - with active plate of the emitter.
In particular cases the sonic emitter is designed as a cylindrical piezoelectric ceramic element or the sonic emitter can include at least two cylindrical piezoelectric ceramic elements connected through symmetrising connecting sleeve, or the sonic transmitter is designed as a cylindrical magnetostrictive element, or the sonic transmitter can include at least two cylindrical magnetostrictive elements connected through symmetrising connecting sleeve.
Preferably waveguides rods 6,7 are provided with thread for mounting washers made of the material that is heavier than the rod material, waveguides rods can be made of the following materials -
aluminium alloy , titan - and the washer mounted on the waveguides 6,7, can be produced from the following materials: brass, copper, steel.
Preferred embodiment Detailed Description of the Invention Diagram in fig.1 shows the design of equivalent half-way composite resonator, fig.2 - oscillatory shift curve of the resonator elements, fig.3 - waveguide circuit diagram, fig.4 - construction diagram of the arrangement for low frequency wave effect on the perforation zone of the well casting pipe. Arrangement for low frequency wave effect includes sonic emitter that can be designed in form of cylindrical piezoelectric ceramic element or in form of at least two cylindrical piezoelectric ceramic elements connected through symmetrising connecting sleeve, or as a cylindrical magnetostrictive element, or as at least two cylindrical magnetostrictive elements connected through symmetrising connecting sleeve. Fig.1 shows the arrangement, in which the emitter is designed as two cylindrical piezoelectric ceramic or magnetostrictive elements 1 ,2 connected through symmetrising connecting sleeve 3.
The emitter is connected with the passive back plate 9 and positioned in the hermetic enclosure consisting of two parts 10,11. Through the sealed connector 12 the cable 13 is connected with arrangements.
Arrangement also includes active emitting plate 8 in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure 10,11 , as well as at least one metallic reflector 15 with flat surfaces parallel to the flat surfaces of the active emitting plate 8 that can be moved along the arrangement axis and fixed in the predefined position. The emitter 15 is mounted on the carrier 14. The sonic emitter is equipped with two matching metallic conic concentrators 4,5 positioned at both sides of the emitter, and two cylindrical bimetallic rib waveguides 6,7. Each concentrator 4,5 at one end is connected with the emitter and at the other end - with the end of one of
the bimetallic rib waveguides 6,7. Each of the waveguides 6,7 is produced as a cylindrical rod with the ribs in form of washers (ribs) 17 equally distributed along its length. Bimetallic waveguides 6,7 are named so because their rods and washers 17 are produced from two metals essentially differing by their physical properties. The other waveguide end 6 is connected with passive plate 9 of the emitter, and the other waveguide end 7 - with active plate 8 of the emitter.
Waveguides rods 6,7 are provided with thread for mounting washers 16 made of the material that is heavier than the rod material. Waveguides rods 6,7 can be made of the following materials - aluminium alloy , titan - and the washer 17 mounted on the waveguides 6,7, can be produced from the following materials: brass, copper, steel. Washer 17 configuration is chosen to achieve maximum value of the local mass around its perimeter and maximum waveguides 6,7 compressibility. The arrangement is located in the holes 18 zone (perforation) of the casting pipe 16.
Fig. 1 shows: ζ - oscillatory shift, q - linear dimension of the waveguide passive part 6, a - linear dimensions of the waveguide active part 7, L - passive plate length, b - active plate length, fig. 2 shows: m - rib (washer) weight, 17, c - material compressibility of the waveguide section 6,7.
The arrangement works as follows.
The arrangement is sunk in the casting pipe 16 on the cable 13 into the perforation zone of the holes 18.
Stimulating voltage in the area of the emitter resonance frequency is transferred over the cable 13 to the emitter 1 ,2. Sleeve 3 ensures equal resilience on both sides of the emitter 1 ,2. Active emitting plate 8 emits acoustic vibrations in phase opposition to the upper und lower flat surfaces in the opposite directions. Inside the liquid volume between the active plate 8 and the reflector 15 a field of stationary waves is created. Passive plate 9 creates arrangement symmetry in relation to central cross-section.
Two metallic conic concentrators 4,5 positioned at both sides of the emitter 1 ,2 adjust emitter load through waveguides 6,7 with plates 8,9.
Due to the fact that the steel walls hardness of the casting pipe 16 is essentially bigger than the elasticity of the liquid filling the well, and that total area of the holes 18 is essentially less than the side surface area of the casting pipe 16, increase of the vibration effect intensity inside resonating volumes is essentially greater when compared with the intensity created by the emitter in the free space. Compared with the prototype the achievable frequency reduction may be threefold at the same emitter lengths.
In this way an effective arrangement for low frequency wave effect on the perforation zone of the well casting pipe is created and devices inventory for low frequency effect on the perforation zone of the well casting pipe is increased. At that, resonance frequency of the wave effect is reduced, the vibroacoustic effect radius is increased, and arrangement dimensions are decreased.
Industrial Applications The present invention is embodied with multipurpose equipment extensively employed by the industry.
Claims
1. Arrangement for low frequency wave effect consisting of sonic transmitter with passive back plate in the hermetic enclosure, active emitting plate in form of a disc with two flat emitting surfaces perpendicular to the arrangement axis located outside the hermetic enclosure, as well as at least one metallic reflector with flat surfaces parallel to the flat surfaces of the active emitting plate that can be moved along the arrangement axis and fixed in the predefined position, and unique in the way that the sonic emitter is equipped with two metallic conic concentrators positioned at both sides of the emitter, and two cylindrical bimetallic rib waveguides, at that each concentrator at one end is connected with the emitter and at the second end - with the end of one of the bimetallic rib waveguides, and each of the waveguides is produced as a cylindrical rod with the ribs in form of washers equally distributed along its length, at that the other end of one of the waveguides is connected with the passive emitter plate, and the second waveguide end - with the emitter active plate.
2. Arrangement according to Claim 1 , characterized in that sonic emitter is designed as cylindrical piezoelectric element.
3. Arrangement according to Claim 1 , characterized in that sonic emitter is designed as at least two cylindrical piezoelectric ceramic elements connected through symmetrising connecting sleeve.
4. Arrangement according to Claim 1 , characterized in that sonic emitter is designed as cylindrical magnetostrictive element.
5. Arrangement according to Claim.1 , characterized in that sonic emitter is designed as at least two cylindrical magnetostrictive elements connected through symmetrising connecting sleeve.
6. Arrangement according to any of Claims 1-5, characterized in that the waveguides rods are made with the thread for mounting washers produced form the material heavier that the rod material.
7. Arrangement according to any of Claims 1-5, characterized in that the waveguides rods are made of the material of the following group: aluminium alloy, titan.
8. Arrangement according to any of Claims 1-5, characterized in that the washers mounted on the waveguides are made of the material of the following group: brass, copper, steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU2007/000344 WO2009002204A1 (en) | 2007-06-25 | 2007-06-25 | Arrangement for low frequency wave effect on the perforation zone of the well casting pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU2007/000344 WO2009002204A1 (en) | 2007-06-25 | 2007-06-25 | Arrangement for low frequency wave effect on the perforation zone of the well casting pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009002204A1 true WO2009002204A1 (en) | 2008-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RU2007/000344 WO2009002204A1 (en) | 2007-06-25 | 2007-06-25 | Arrangement for low frequency wave effect on the perforation zone of the well casting pipe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3982606A (en) * | 1975-01-22 | 1976-09-28 | Mobil Oil Corporation | Acoustical logging apparatus having signal delay means |
| US4184562A (en) * | 1977-11-14 | 1980-01-22 | Standard Oil Company (Indiana) | Multi-directional assemblies for sonic logging |
| SU1402991A1 (en) * | 1986-06-09 | 1988-06-15 | Всесоюзный Научно-Исследовательский Институт Ядерной Геофизики И Геохимии | Acoustic transducer |
| RU2263203C2 (en) * | 2003-11-05 | 2005-10-27 | Фролов Дмитрий Павлович | Device for applying acoustic action on perforation zone and oil- bearing formation in bottom zone |
| RU2286587C1 (en) * | 2005-06-08 | 2006-10-27 | Дмитрий Павлович Фролов | Device to apply acoustic action to perforation zone and oil-bearing formation |
-
2007
- 2007-06-25 WO PCT/RU2007/000344 patent/WO2009002204A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3982606A (en) * | 1975-01-22 | 1976-09-28 | Mobil Oil Corporation | Acoustical logging apparatus having signal delay means |
| US4184562A (en) * | 1977-11-14 | 1980-01-22 | Standard Oil Company (Indiana) | Multi-directional assemblies for sonic logging |
| SU1402991A1 (en) * | 1986-06-09 | 1988-06-15 | Всесоюзный Научно-Исследовательский Институт Ядерной Геофизики И Геохимии | Acoustic transducer |
| RU2263203C2 (en) * | 2003-11-05 | 2005-10-27 | Фролов Дмитрий Павлович | Device for applying acoustic action on perforation zone and oil- bearing formation in bottom zone |
| RU2286587C1 (en) * | 2005-06-08 | 2006-10-27 | Дмитрий Павлович Фролов | Device to apply acoustic action to perforation zone and oil-bearing formation |
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