Acoustic borehole locator LAS

Special geophysical systems

Acoustic borehole locator LAS

Appointment

The borehole acoustic locator LAS is designed to determine the volume of underground reservoirs at underground gas storage facilities.

LAS can be used in the construction of underground storage of hydrocarbons and toxic waste of various industries, in the extraction of mineral salts by leaching, the study of deep karst and other similar problems.

Acoustic borehole locator LAS

The borehole acoustic locator LAS is registered in the State Register of Measuring Instruments of the Russian Federation under No. 61834-15. Certificate of type approval of measuring instruments RU.C.27.002.A No. 60045 issued by the Federal Agency for Technical Regulation and Metrology.   

The declaration of conformity of the Customs Union TC N RU D-RU.AG35.B.00341. 

Permission to use No. РРС 00-049893 is issued by the Federal Service for Ecological, Technological and Nuclear Supervision. 

 

General information

  • The LAS complex consists of an ultrasonic scanning locator made in the form of a downhole tool (PS), a ground telemetric unit (BNT), a laptop and is equipped with technological software (TPO) and a data processing program (AML).  

  • The equipment was created on the basis of the latest technologies for receiving and digital signal processing using a modern elemental base and original circuitry solutions.  

  • PS performs a slice scan of the cavity and determines the speed of ultrasound in the working environment. The PS is equipped with a high-speed analog-to-digital converter, large RAM and a powerful special processor that organizes the work of the locator in all modes.    

  • The digital data transmission channel between the PS and BNT allows to increase the dynamic range, resolution and accuracy of the equipment, and also provides its maximum noise immunity.  

  • BNT organizes two-way flows of commands between the hardware elements of the LAS complex and generates arrays of scan data, linking slices in magnetic azimuth and depth.  

  • TPO implements all the algorithms of the LAS complex and has a convenient operator user interface. Data during the location process is displayed in the form of a polar scan attached to the magnetic meridian of the contour of the horizontal section of the cavity or in the form of an oscillogram.  

  • AML carries out all the procedures for analyzing the acoustic sounding data of the studied objects and presents the results in the form of: polar scan of the contour at a given depth, vertical sections, 3-dimensional image of the cavity, table of slices, graph of volume dependence on depth.

 

LAS connection diagram

General view of the complex prepared for work, together with the equipment of a geophysical elevator.

General view of the complex prepared for work, together with the equipment of a geophysical elevator.

 

Technical characteristics of the complex

Name

Value

Range of measured distances:
- lateral antenna, m
- lower antenna, m
- additional antenna, m


from 0.5 to 160
from 0.5 to 50
from 0.5 to 50

The accuracy of determining distances,%

2

The error in determining the angle of rotation of the speaker system relative to the direction to the north, ang . hail.

5

Location carrier frequency, KHz

298

Ultrasound pulse width setting range, μs

from 3 to 850

The range of the amplitude setting is the voltage at the antenna upon excitation of an ultrasound pulse, V

from 1 to 300

Scan time of one cut, s

160

The minimum angular step during scanning, °

1

Length of a three-core logging cable of the KG3-60-150 type, m

up to 5000

Ground Recording Unit Parameters

Supply voltage of alternating current 50 Hz, V

220 ± 10%

Maximum power consumption from AC 220 V, W

300

Computer Communication Interface

Ethernet

Operating temperature range, ° С

from 10 to 50

Overall dimensions, mm

430 x 330 x 180

Mass of the registering unit, kg, no more

eleven

Downhole Scan Probe Parameters

Maximum hydrostatic pressure, MPa

20

Operating temperature range, ° С

from 10 to 80

Diameter of the downhole tool, mm

80

Downhole tool length, mm

2150

Weight of the downhole tool, kg, no more

25

 

Working windows example

  1. Processing software: cross-section table and 3-dimensional well model.

Processing software: cross-section table and 3-dimensional well model.

 

  1. Processing software: a table of sections and a 3-dimensional model of the well (horizontal and vertical sections).

Processing software: a table of sections and a 3-dimensional model of the well (horizontal and vertical sections).

 

  1. Processing software: sectional table and 3-dimensional well model (horizontal sections only).

Processing software: sectional table and 3-dimensional well model (horizontal sections only)

 

  1. Processing software: cross-section table and 3-dimensional well model (only vertical sections).

Processing software: cross-section table and 3-dimensional well model (only vertical sections)

 

  1. Processing software: cross-section table and 2-dimensional model of the well (vertical section, direction west – east).

Processing software: cross-section table and 2-dimensional model of the well (vertical section, direction west – east)

 

  1. Processing software: section table and section scan in the polar coordinate system.

Processing software: section table and section scan in the polar coordinate system

 

  1. Processing software: table of sections and graphs: capacitance, speed of sound, vertical profile in one of the azimuthal directions.

Processing software: table of sections and graphs: capacitance, speed of sound, vertical profile in one of the azimuthal directions

 

  1. Processing software: a table of sections and a table of the main parameters of the well.

Processing software: a table of sections and a table of the main parameters of the well

 

  1. Processing software: one of the possible combinations of windows when working with a program for processing scanning results.

Processing software: one of the possible combinations of windows when working with a program for processing scanning results

 

  1. Technological software: scanning in the registration mode of the arrival time of the reflected signal.

Technological software: scanning in the registration mode of the arrival time of the reflected signal.

 

  1. Technological software: scanning in the mode of full registration of the reflected signal.

Technological software: scanning in the mode of full registration of the reflected signal

 

  1. Printout of scan results from the processing program.

Printout of scan results from the processing program  Printout of scan results from the processing program

 

Printout of scan results from the processing program  Printout of scan results from the processing program

 

Printout of scan results from the processing program Printout of scan results from the processing program

 

Look:

Presentation LAS [Presentation_LAS.pdf]

RD 03-243-98 Instruction for the safe conduct of work and the protection of subsoil during the development of salt deposits by dissolving through wells from the surface

SP 34-106-98 Underground storage of gas, oil and products of their processing

Work on the well (photo report)

A version of the station of the LAS complex and the lift based on the GAZelle vehicle