RKU General-Purpose String Disconnector

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RKU General-Purpose String Disconnector

RKU General-Purpose String Disconnector

It is designed to set and disconnect a tubing string, to provide a movable pressure-tight connection between the tubing string and packer and anchor equipment in the production string as well as to retrieve this equipment.

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  • recommended for multiple-zone production and multiple-zone injection;
  • in injection, oil and gas production cased wells;
  • remedial cementing and other technological operations that require disconnection of the tubing string from the downhole equipment;
  • operations requiring a compensation for the tubing string axial movements and maintaining the pressure-tightness.


  • disconnection assembly can be actuated in three ways:
    1. after dropping a ball into the tubing and generating pressure inside the tubing;
    2. without dropping the ball by generating pressure inside the tubing or
    3. by generating pressure in the annulus;
  • movable (up to 85.12 in) pressure-tight connection between the tubing string and packer and anchor equipment;
  • this tool can be used multiply;
  • using this tool for downhole well operations allows to reduce the workover time and material costs.


  • sealing assembly;
  • spline joint for rotation transmission;
  • disconnecting and fishing devices are combined in one RKU assembly.


  • Testimonial from OJSC “Surgutneftegaz”


  • Oil. Gas. Novation 12.2012 “Technologies and equipment to reduce expenses in squeeze cementing”.


Type Design Documentation Code Casing ID in, (not less than) Travel length, in Dimensions, in Load on RKU, lbf (not more than) Disconnection pressure in
the tubing or in the annulus, psi
Maximum temperature, F Weight, lb (not more than) NUE connection thread*
OD ID Length, in compressed position Compression load Tensile load Top (box) Bottom (nipple)
RKU-118 АХА 4.239.127 5 1/2 5 3/4 59.00 4.64 2.32 85.12 67461 78683 1015-65251 302 275 3 1/2”
RKU-140 АХА 4.239.128 6 5/8 7 59.00 5.51 2.32 7 67461 78683 1015-65251 302 275 3 1/2”
RKU-150 АХА 4.239.129 7 59.00 5.9 2.32 7 67461 78683 1015-65251 302 287 3 1/2”

* Other threads are available upon request.
1 Disconnection pressure in the tubing or in the annulus depends on the number of the set pins.

Upon customer’s request Design Documentation is prepared and other standard sizes are manufactured.


No. SPTA kit Tool for T=100°С Tool for Т=150°С
Type Design Documentation code Type Design Documentation code
1 Zero RKU-118-59-350-Т100-К3-00 AHA 4.239.007-01/00 RKU-118-59-350-Т150-К3-00 AHA 4.239.007-01-20/00
2 Minimum SPTA 01 RKU-118-59-350-Т100-К3-01 AHA 4.239.007-01/01 RKU-118-59-350-Т150-К3-01 AHA 4.239.007-01-20/01
3 Standard SPTA 02 RKU-118-59-350-Т100-К3-02 AHA 4.239.007-01/02 RKU-118-59-350-Т150-К3-02 AHA 4.239.007-01-20/02
4 Standard Plus SPTA 03 RKU-118-59-350-Т100-К3-03 AHA 4.239.007-01/03 RKU-118-59-350-Т150-К3-03 AHA 4.239.007-01-20/03
5 Maximum SPTA 04 RKU-118-59-350-Т100-К3-04 AHA 4.239.007-01/04 RKU-118-59-350-Т150-К3-04 AHA 4.239.007-01-20/04

Sample order code for the disconnector in “Standard SPTA 02” configuration:

  • for Т=100°С — RKU-118-59-350-Т100-К3-02 AHA;
  • for Т=150°С — RKU-118-59-350-Т150-К3-02 AHA


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Dinar Sufiyanov
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