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The low-frequency acoustic complex

The low-frequency acoustic complex is intended for vibroacoustic wave action onthe zone of perforation of oil land ore wells in order to increase their production rate, aswell as the productive layer surrounding the area of perforation. The technology is based

on the low-frequency (200 Hz to 1000 Hz) the impact on the oil layer with a special downhole acoustic transmitter (RF Patent 2263203). The technology of low-frequencystimulation of the layer is used to increase the recoverability rate of viscous oil from thewell.

Increasing of the extraction of oil is a result of a violation of connections of pseudo-crystal structural framework of paraffin and other hydrocarbons from thewalls of the pores under the influence of an intense acoustic field.

With a significant weakening of the connection formation pressure gradient causesthe oil flow in the pore space and the final destruction of the structural frame. After the

acoustic stimulation in the formation and operation of wells in the input rate increasesrecoverability of oil and retains its value over the long term. Developed in the presentapparatus, which implements the technology of low-frequency stimulation of the layer can be used in vertical and inclined oil wells 3,000 meters deep, with the temperature of the liquid to 100 C degrees Celsius, the internal diameter of the casing column in the areaof the productive layer from 100 to 150 mm. The wave effect is achieved by using three

processes.

Impact directly on the environment that plugs holes of perforation. Due to theoscillatory rocking rock particles are destroyed "plug". The most effective processfor the joint use of sound effects and chemically active fluids in wells that arelosing yield due to prolonged use.

Impact on the layer behind the casing column. A wide class of liquids reveals a property to change the viscosity under the influence of external load, revealing atthe same viscoelastic properties. In such liquids, as a rule, the viscosity of themedium decreases with increasing applied voltage - medium "slides" along a solidsurface. Increases the influence of watered well.

Layer can function as a waveguide, without giving effect to weaken the acousticof the departure power beyond its borders, intensifying the effect specified in the

preceding paragraph.

Low-frequency radiators of two kinds are made (photographs in Fig. la and Fig.lb).Patents are number 2,263,203 from 05.11.2003, 2286587 from 08.06.2005. Radiatorsare designed and manufactured at Mechanical engineering design office (KBM), Moscow.

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Low-frequency acoustictransducers

Fig.1a.(resonant frequency of 700 Hz)

Fig.1b.(resonant frequency of 500 Hz)

1 1 1

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Down hole radiator is delivered to the productive layer area under its ownweight on a logging cable lengths up to 5 km.

The principles of their operation are shown in Figure 2. From a wellundergoing vibro-impact the column of compressor pipes is removed.

Low-frequency acoustic complex consists of: low-frequency acoustic transducer Electric Generator Geophysical cable-rope

Acoustic radiator is lifted on a logging cable inside the casing colon via a cable car down to the perforation area.

Acoustic energy radiated by the transmitter, located in the volume of fluid betweenthe radiating surface of the emitter and reflector. Flat radiating plate and a flat reflectingsurface of the screen are oriented perpendicular to the axis of the casing clones, and thegap between them and the nuts columns is minimal.The resounding volume of a liquid iscreated. At the photo of emitter, this volume is indicated by the numbers 1.

One of the emitters it is below the radiating surface and the radiator shell, with a

different design of the radiator it is between the radiator shell and casing column. Changing the distance between the emitter and reflector is achieved by optimizationof the intensification of the acoustic field. Power is supplied to the radiator from thegenerator through a current collector geophysical car. Turbulenting liquid medium bysound frequency vibrations in the area of the perforation holes clean punching in a fewhours. Simultaneously, low-frequency vibrations make it easier to move oil to the oil wellthrough the pores of oil-bearing layer.

1. An electric generator powered by Three-phase 380V 50 Hz

2. Geophysical vehicle with a lift3. Acoustic transducer 4. Logging cable5. Pay zone6. External master generator 7. Equipmentcontrol

Fig.2.

380V50Hz

7 6

5

2

3

1

4

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The first two instances were tested twice in the fields of Tat RITEK Oil in theRepublic of Tatarstan in 2005 - 2006, in the fields of Tatneft in 2009.

The results obtained in all works very positive and significant.

The processing zone punching well number 2576 for 48 hours in the wellboreoilcolumn rose to a height of 75 100 m compared with that before treatment was well. InOctober-December of 2006 the equipment was used to influence the perforation zone of

production wells 2567,3609, as well as the injection well 2504, operating in the sameregion (Nurlat), as well in 2576. All wells perforated zone is located at a depth of about1100-1200m, but the structure of the layer varies. Injection well- not functioning, due tothe complete no admission water.

A characteristic feature is that immediately after the vibroacousticeffect, all wellssharply increased the impact or acceleration.

Deaf injection well for each of the two treatments lasting about 3 days of each saidacceleration in terms of daily consumption (24) value of 144 m3. The subsequent behavior of well production is not known, because customer with these results are not briefed.

The results of the work conducted in 2006 and 2009 are summarized in Tables 1 and 2.

Table 1

Table 2

Documentation on the low-frequency acoustic complex was prepared to carry out its

well number Debit of oilbefore

processing

Debit of oil afterprocessing

Action time

2567 5,2m /day. 11,5m /day . two days

3609 2,9m /day . 5,8 m /day . three daysInjection well 0m /day . 144 m /day . about 3 days

Date Well number Debit of oilbefore

processing

Debit of oil afterprocessing

Thickness of processedhorizons

Action time

29.06.2009 26280 0,7 tons / day 1,9 tons / day 4,5h.

30.06.2009 17673(Jalil)

6 tons / day 9 tons / day 4m 8h.

01.07.2009 23081(Alekseevskaya

Square)

11,78 tons / day 16 tons / day two horizons of 3m 12h.

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certifications.

Developers equipment can take orders for its manufacturing production for a periodfour to five months, taking into account changes in customers' request. They take on theresponsibility for teaching personnel of service companies, as well as repair in the field of

its use.

Note

Experimental work on the new technology in TATRITEK-OIL was carried out on thefield at a depth of 1000 meters reservoir, oil viscosity in the range from 100 to 160centipoises at asphalten content to 7.2%.

For comparison: Western Siberia (Surgut region) in the main part of the stock values of oilviscosity is within 0.5 - 5 cps. in Alaska bed, folded sandstone at a depth of 1,000 meterswith a constant (0,01-0,14 um2), contains the oil density960 kg/m3 and a viscosity of 20 -100 cps.

Results of studies have shown that the presented technology can increase thelevel of production of viscous oil from wells to near its original value and reduce thewater content of oil by 30%

Contact number:8-903-779-0811

Nicolay Lvov

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Appendix 1. Technical parameters of the complex

Table 3.Low -frequency acoustic transducer number la.

1 Designed acoustic transducer with a fundamental operating frequency 700 Hz

2 Note: If low-power can work in a range of Hz 400 Hz 1500 Hz 3 Maximum power consumption from the supply of electric generator 2W4 Maximum value of the external pressure of 40 P

(Maximumoperating depth

4 km )5 Range of operating temperatures of the liquid to 130 6 The length of the zone simultaneously acting on the perforation 2m7 Weight of radiator 90 g8

Length of the radiator without a reflector of 2,7 m

9 is designed to operate in wells with an inner diameter of 100 mm 150 mm

Table 4. Powerful electric generator

1 Frequency range of generator 400 Hz 1500 Hz

2 Maximum power supplied to a resistive load of 2 W3 Regulation of output - gradual 20dB4 The magnitude of the load impedance 150 hms

600 hms5 The magnitude of the reactance load 0,20,7 uF6 The load is the acoustic radiator is powered via the logging cable lengths

up to 5 m7 The generator three-phase AC 50Hz 380V or 220V 8 Weight of the generator does not exceed 20 kg9 Volume of the generator is less than 0.1 m10 Time of continuous operation is not limited * Electrical energy generator is converted into acoustic energy radiator

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Powerfull electric generator

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Appendix 2. Work on oil wells in republic Tatarstan