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Casing heads

Casing heads are used for sealing of the biggest casing (conductor) in wellhead and for hanging of the second casing

Design Features

  1. Casing head body – forged type, material as per API 6A requirements

    There are two types of body-conductor joint:

    API thread;

    Welding. For the testing of the welding joint there is a special threaded port.

  2. Upper connection – API 6Aflange.
  3. Side outlet connection: threaded ports for nippels.
  4. Two types of hangers provide the reliable hanging of casings. The hanging of the casing is made before the edging of the casing top.

    The reliability of primary seal of annular clearance between the head and the casing is provided with elastomer seal operationable at working pressures up to 10 000 psi and working mediums with content of H2S and C02 up to 25% each.

    The sealing of the annular clearance is provided by means of loading of the elastomer seal upon the tightening of the hanger screws (for type I and type II hangers), or by means of slanting of external and internal edges of the elastomer seal (for type IV hangers).

    The casing heads are supplied with operational documentation which includes design description, installation requirements, operation manual, hydrostatic test protocol and material specifications.


     

Casing Heads, type I and type II, Technical Data

Top flange nominal size Casing sizes Inside through diameter Dimensions
  Secondcasing Conductor d D D1 H h
inches-psi-N of gasket mm mm mm mm mm mm mm
11-3000-R 53 146 219 210 545 368 457 320
  168 245 235     458  
  245   236   380 560 395
13 5/8-2000-R 57   324 304 560 405 458 320
13 5/8-3000-R 57 245 324 304 610 432 457 317
16 3/4-3000-R 66 324 426 385 705 510 467 290
  299   399   515 500 335
  324   406        
11-5000-R 54 168 245 235 585 368 457 317
13 5/8-5000-BX 160 245 324 304 675 481 457 317
    340 300     460  
  219 299 288     457  
  245 324 304     500 330
11-3000-R 53 168 245 225 545 370,5 457 317
      234   368 500 330
13 5/8-3000-R 57 245 324 314 610 432 500 335
16 3/4-3000-R 66 324 426 406 705 515    
13 5/8-3000-R 57 245 324 304 610 432 457 310
16 3/4-3000-R 66 324 429 385 705 510 467 290

Casing spools

Casing spools are used for sealing and hanging of casings.

Design Features

  1. Casing spool body – forged type, material as per API 6A requirements.
  2. Top and bottom connections – API 6Aflanges.
  3. Side outlet connections – API 6A flange type with threaded port for installing of the valve removal tool.
  4. There are two types of slip hangers which are installed inside the spools.
  5. The reliability of the secondary seal is provided by means of U-shaped elactomer seal installed in the spool bottom flange where the special ports are made for injecting of the sealing paste to secondary seal. The secondary seals are operationable at working pressures up to 15 000 psi and in working mediums with content of H2S and C02 up to 25% each.
  6. There are two types of secondary seals provided:

    а) single, type I

    б) double, type II

    For monitoring of secondary seals leakproofness there is a special port with valve in spool bottom flange.

  7. The casing spools are supplied with operational documentation which includes design descriptioninstallation requirements, operation manual, hydrostatic test protocol and material specifications.