Star Packer Drilling Equipment

Inflatable Packers

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Inflatable packers are used around the world, as underground test devices for liquid pressure measurements and major elements used where drilling and injection are done by injection of consolidating or waterproofing grouts, and have many applications related to construction sites mentioned below.

Star packers are manufactured using layers in of steel cable bedded into natural rubber giving them the strength to resist the rough conditions of worksite used. The exception expansion capacity by using hydraulic liquid or gas pressure enables a good seal either in regular or uneven boreholes , as well as facilitating running in and retrieving.
 
HOW DO PACKERS WORK ?
Injection is done through a central stainless steel tube. The inflatable hose is equipped with special fitting, one end is wedded to the center tube while the other slides freely along it. The seal is assured by series of ‘’o ‘’ rings and scraper joint. The packer is inflated through a separate inflation tube.
      
WORKSITE USED
 Our firm offers an exceptional range of different packers’ diameters, this is due to different conditions and circumstances of worksite use , such as :

  • Construction sites bases, tunnels, dams and pools or lacks where drilling and injection are used .
  • Tests for underground water pressure measurements .
  • Hydrological  tests where dams and pools construction are done.
  • Tests and measurements for Injection pressure applications .
  • For site investigation and coal mines .

PACKERS’ PRODUCTION TYPES AND THEIR ELEMENTS
 
Injection packers consist of two main parts :

  1. Inflatable packers, in case inflatable hose is equipped with special steel fittings, one end is welded to the central tube while the other slides freely along it.
  2. Mechanical connectors elements and injection tube, in case rubber is squeezed by pushing the arm around it.

Inflatable packers are manufactured by selection good materials, designed and realised according to engineering laws and techniques, in case rubber which contains steel cables, is inflated by using prescribed hydraulic pressure w.r.t packer’s type as mentioned below without causing any deformation and coaxial problems and to resist the rough conditions . Double packer is defined as two single packers connected to each other by means of a perforated tube ( Z ) varies in length  L ( 500-1000 mm ) and in diameter  (42-170 mm). Double packer is inflated at the same time by using safety hydraulic pressure. Each single packer has sliding end which slides freely in the same direction.

HOW TO SELECT A SUITABLE PACKER ?

Sometimes, it is evident that users fail to select an appropriate type of packer with respect to given technical data at worksite use such as : working pressure in relation with borehole diameter.
 
So, to avoid such a problem and to select a suitable packer’s type, the table and the graph  prepared below demonstrate maximum working pressure (bar) in relation with borehole diameter (mm) . 
 
A PERCAUTIONS FOR USE
 
Storage : Star packers are manufactured using natural rubber. Their performance and qualities can be impaired by long exposure to excessive heat.
 
Temperature : As indicated the extremes of temperature for a short period are from - 45 to + 65 C .
Inflation and deflation : the packers deflation, particularly when inflated with water, request a certain delay, variable according to inflation hose length and section as to the inflated packer volume. This delay can reach several minuets specially for the biggest diameters. Packers is recommended to rest a few minutes before retrieving even when the inflation manometer is returned to zero.
 
Note : it is important not to exceed the maximum inflation pressure in relation to borehole diameter, and the inflation pressure should always be superior to the injection pressure, particularly when inflation with gas .
 
POSSIBLE EXPLANATIONS FOR DAMAGING A PACKER

  • Cavities in a washed out borehole .
  • Sharp or pointed fragments in the borehole which could pierce the sleeve .
  • Soft ground not having the strength to resist the packer expansion .
  • Natural back pressure. ( Ex : Artesian well )

 
SOME MISUSES WHICH COULD DAMAGE THE PACKER

  • Too high inflation pressure ( see table maximum working pressure above )
  • Too high injection pressure including surges of pressure during injection .
  • Obstruction to the sliding ends .
  • Faulty inflation equipment .

SAFETY
All of Star packers are tested in our workshop to the prescribed pressure as mentioned either in the table or in the graph above .
So, considering the nature of apparatuses working under pressure it is evident that users should appreciate the dangers and take the necessary precautions relating to the safety of their employees .

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HOW TO SELECT A SUITABLE PACKER ?
 
Sometimes, it is evident that users fail to select an appropriate type of packer with respect to given technical data at worksite use such as : working pressure in relation with borehole diameter.
 
So, to avoid such a problem and to select a suitable packer’s type, the table and the graph  prepared below demonstrate maximum working pressure (bar) in relation with borehole diameter (mm) .  
 
A PERCAUTIONS FOR USE
 
Storage : Star packers are manufactured using natural rubber. Their performance and qualities can be impaired by long exposure to excessive heat.
 
Temperature : As indicated the extremes of temperature for a short period are from - 45 to + 65 C .
Inflation and deflation : the packers deflation, particularly when inflated with water, request a certain delay, variable according to inflation hose length and section as to the inflated packer volume. This delay can reach several minuets specially for the biggest diameters. Packers is recommended to rest a few minutes before retrieving even when the inflation manometer is returned to zero.
 
Note : it is important not to exceed the maximum inflation pressure in relation to borehole diameter, and the inflation pressure should always be superior to the injection pressure, particularly when inflation with gas .
 
POSSIBLE EXPLANATIONS FOR DAMAGING A PACKER
 

  • Cavities in a washed out borehole .
  • Sharp or pointed fragments in the borehole which could pierce the sleeve .
  • Soft ground not having the strength to resist the packer expansion .
  • Natural back pressure. ( Ex : Artesian well )

 
SOME MISUSES WHICH COULD DAMAGE THE PACKER

  • Too high inflation pressure ( see table maximum working pressure above )
  • Too high injection pressure including surges of pressure during injection .
  • Obstruction to the sliding ends .
  • Faulty inflation equipment .

SAFETY
    
All of Star packers are tested in our workshop to the prescribed pressure as mentioned either in the table or in the graph above .
So, considering the nature of apparatuses working under pressure it is evident that users should appreciate the dangers and take the necessary precautions relating to the safety of their employees .

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