OIL AND GAS WELL SLOTTING PERFORATION TECHNOLOGY PROFESSIONAL SERVICE

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UNDERGROUND HYDRAULIC SLOTTING PERFORATION (SPT/HSP) TOOL

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Underground slot-perforation (SPT/HSP) tool, regardless of the design, consists of the following mandatory parts:

 

  • perforator with nozzles

  • return unit

  • hydraulic unit

External dimensions of body SPT/HSP tool are determined by the most commonly used well's standards. In North America the most common ID well casings 4.5" and 5.5".

 

Technical characteristics:

Internal design and construction of SPT/HSP tool for vertical and horizontal wells are different.

 

Currently Maxxwell Production is using SPT/HSP tool by patent US 8863823 (granted October 21, 2014), which replaced the previous model by patent US 8240369 (granted August 14, 2012). Equipment is constantly being improved.

  • Body OD SPT/HSP tool

  • Assembled length SPT/HSP tool for vertical wells

  • Assembled length SPT/HSP tool for horizontal wells

  • Perforator OD depending on ID well casing

  • Full weight SPT/HSP tool for vertical wells

  • Full weight SPT/HSP tool for horizontal wells

  • Maximum operating pressure (psi)

  • Maximum operating depth­

  • ­Cutting speed for cased wells (min/linear ft.)

  • Cutting speed for uncased wells (min/linear ft.

  • Average nozzles operating time (hours)Average penetration area (ft²/ft) 2 nozzles

  • Average penetration area (ft²/ft) 3 nozzles

  • Average penetration area (ft²/ft) 4 nozzles

  1. 3.5"

  2. 11.5'

  3. 6.5'

  4.  

  5. 200 lb

  6. 100 lb

  7. 6000 psi

  8. 17000'

  9. 50 min

  10. 30 min

  11. 10 hours

  12. 13 ft²

  13. 20 ft²

  14. 26 ft²

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HYDRAULIC UNIT (Patent US 8863823)

Hydraulic slotting perforation unit is a main part of HSP tool for performing slotting perforation process.

 

At applied working fluid pressure hydraulic unit creates a forward rectilinear motion of the perforator with nozzles (along the borehole). Speed of movement defines the cutting depth. Speed is constant, but depends on the pressure  and temperature of working fluid.

 

Hydraulic unit is a sealed and closed system, able to change its internal volume depending on exposure of external hydro-static pressure at different depths, to prevent an explosion.­

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RETURN UNIT (Patent US 8863823)

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Return unit is a part of SPT/HSP tool, providing a return the perforator with nozzles to the original (start-up) position, when cut opera-ting pressure.

 

Return unit also provides the following functions:

 

  • prevents circular rotation of perforator with nozzles

  • or conversely, allowed freely rotate of perforator with nozzles

  • defines the direction of cutting slots (directly, along the borehole, or angled, by spiral)

  • prevents force impact  on the hydraulic block at accidental lowering perforator on the obstacle

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PERFORATOR (Patent US 8863823)

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Perforators is a part of SPT/HSP tool, performs rectilinear translational movement along the borehole, thereby providing cutting slots by cutting jets from nozzles.

 

In the perforator working fluid changes its direction, and flows into the nozzles. Also perforator prevents the nozzles from shocks and touches the walls of the well.

 

Perforators vary in design, type, form, destination, number of nozzles, number of stiffened ribs, for different well designs, diameter, tasks, etc.

 

Exist ergonomic, streamlined, multiple use, for vertical and horizontal wells, self-oriented, swiveling, etc.­

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NOZZLES (Patent US 8863823)

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Nozzles for SPT/HSP are made ​​from high quality tungsten mixture of carbide, tungsten, corundum, technical diamond grit and special additives in a definite proportion.

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Nozzles must to meet all  requirements of HSP technological process:  lasting of work,  resistance to high temperature, high pressure, impacts, crumbling and have a high hardness.

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The nozzles are of different design and size, depending on the form of nozzle holders and perforators, in which they are used.­

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COMPENSATORS (Patent US 8240369)

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In some rare cases, and using a special technique of executionfor, for cutting short slots along the borehole in vertical wells, possible to use special compensators.

 

Compensators simulate forward movement of perforator with nozzles, and allow to create a short slots in casing, cement and formation.

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ADAPTERS (Patent US 8240369)

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Adapters is element for connecting  SPT/HSP tool with standard tubing or coiled tubing. 

 

Adapters also can perform other functions, as pressure testing of tubing or coiled tubing.

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Nonmagnetic adapters, visible at logging, can be used at correlate the initial installation of cutting interval.

 

Also exist elongated adapters, smoothing fluctuations of supply working fluid pressure. In this case adapter partially function as compensator.

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