Wellhead Component – horizontd

Casing Head

The casing head, installed at the bottom of wellhead assembly connecting casings and various wellhead assemblies, is composed of a body, casing hanger and seal assembly. The casing head is used for supporting the weight of technical and production casing, sealing the annual space between the casing and providing a filtered connection for the installation of upper wellhead assemblies. These assemblies include a blowout preventer (BOP), tubing head and Christmas tree. The surface casing is connected by a flange located below the casing head. The oil-string casing is connected by a screw thread inside of the casing head.

Casing Head Housing

The casing head housing is the lowest part of the wellhead assembly and is almost always connected to the surface casing string. The casing head housing serves suspend and seal a casing string. HTD’s Casing Head Housing is designed as follows:

Bottom Size In	Top Flange		Side Outlets
	Size In	Working Pressure Psi	Size In	Working Pressure Psi
20 Buttress Box Thread	21 1/4	2000	2 1/16	5000
18 5/8 Buttress Box Thread	21 1/4	2000	2 1/16	5000
20 S.O.W (Socket On Weld) Box	21 1/4	2000	2 1/16	5000
18 5/8 S.O.W Box	21 1/4	2000	2 1/16	5000
20 Buttress Box Thread	20 3/4	3000	2 1/16	5000
18 5/8 Buttress Box Thread	20 3/4	3000	2 1/16	5000
20 S.O.W Box	20 3/4	3000	2 1/16	5000
18 5/8 S.O.W Box	20 3/4	3000	2 1/16	5000
18 5/8 Slip On Lock Box	20 3/4	3000	2 1/16	5000
13 3/8 S.O.W Box	13 5/8	3000	2 1/16	5000
13 3/8 S.O.W Box	13 5/8	5000	2 1/16	5000

Material Class: AA, BB, CC, DD, EE, FF, HH
Temperature Class: SU (-60℃ ~ 121℃)
Specification Level: PLS1 to PSL3G

Casing Head Spool

Equipment attached to another casing head, which serves to suspend and seal a secondary casing string. Outlets are provided for annular access. Multiple casing spools may be stacked to hang intermediate and production casing strings. HTD’s Casing Head Spool is designed as follows:

Bottom Flanged		Top Flanged		Side Outlets
Size In	Working Pressure Psi	Size In	Working Pressure Psi	Size In	Working Pressure Psi	Seals In
21 1/4	2000	13 5/8	3000	2 1/16	5000	P-SEAL 13 3/8
20 3/4	3000	13 5/8	5000	2 1/16	5000	P-SEAL 13 3/8
16 3/4	5000	13 5/8	5000	2 1/16	5000	P-SEAL 13 3/8
16 3/4	5000	13 5/8	10000	2 1/16	10000	P-SEAL 13 3/8
13 5/8	3000	11	5000	2 1/16	5000	P-SEAL 9 5/8
13 5/8	5000	13 5/8	5000	2 1/16	10000	P-SEAL 13 3/8
11	3000	11	3000	2 1/16	5000	P-SEAL 9 5/8
11	3000	11	3000	2 1/16	5000	P-SEAL 8 3/4
11	10000	11	10000	2 1/16	10000	P-SEAL 9 5/8
11	10000	11	10000	2 1/16	10000	P-SEAL 7
11	10000	11	10000	2 1/16	10000	FS-SEAL 9 5/8

Material Class: AA, BB, CC, DD, EE, FF, HH
Temperature Class: SU (-60℃ ~ 121℃)
Specification Level: PLS1 to PSL3G

Casing Hanger

It is a mechanism used to support a casing string in a casing head. Casing hangers are available with either threaded (mandrel) or slips. Slip-type hangers are available in automatic-sealing and no automatic-sealing varieties. Automatic hangers have seals which are energized by casing weight, while no automatic hangers have seals which require means other than casing weight to be energized. No automatic hangers are typically

used when insufficient casing load is available or when cementing back to the surface. HTD’s Casing Hanger is designed as follows:

Type	Automatic	Non-Automatic	Bottom Thread , In	Top Thread , In
Slips & Seal	P	P	X	X
Slips & Seal	P	P	X	X
Slips & Seal	P	P	X	X
Slips & Seal	P	P	X	X
Mandrel	X	X	13 3/8 Buttress Box	17.25-2tpi Stub Acme
Mandrel	X	X	10 3/4 VAM Top Box	11-4tpi Stub Acme
Mandrel	X	X	9 5/8 Buttress Box	10-6tpi Stub Acme

Tubing Head

The tubing head is installed above the casing head and includes a tubing head spool and tubing hanger. The tubing hanger is used for hanging the internal tubing string and sealing the annular space between tubing and casing. This is used for conducting well flushing in direct circulation and reverse circulation, observing casing pressure, and for carrying out various tasks through the tubing and casing annular space.

Tubing-Head Spool

Piece of equipment attached to the uppermost casing head or smallest casing string which serves to suspend the tubing and to seal the annular space between the tubing and casing. Tubing head spool is similar to a casing head spool. It has a cone-shaped bore to accommodate the tubing hanger. HTD’s Tubing Head Spool is designed as follows:

Bottom Flanged		Top Flanged		Side Outlets
Size In	Working Pressure Psi	Size In	Working Pressure Psi	Size In	Working Pressure Psi	P-Seal In
11	3000	11	3000	2 1/16	5000	7
11	5000	11	5000	2 1/16	5000	9 5/8
11	5000	11	5000	7 1/16	5000	9 5/8
11	10000	11	10000	2 1/16	10000	7
11	10000	11	10000	2 1/16	10000	9 5/8
11	10000	11	10000	2 1/16	10000	10 3/4
13 5/8	3000	11	3000	2 1/16	5000	9 5/8
13 5/8	3000	11	5000	2 1/16	5000	9 5/8
13 5/8	3000	11	5000	7 1/16	5000	9 5/8
13 5/8	5000	11	5000	2 1/16	5000	9 5/8
13 5/8	5000	11	10000	2 1/16	10000	9 5/8
13 5/8	5000	13 5/8	5000	2 1/16	5000	10 3/4
13 5/8	10000	13 5/8	10000	2 1/16	10000	10 3/4

Material Class: AA, BB, CC, DD, EE, FF, HH
Temperature Class: SU (-60℃ ~ 121℃)
Specification Level: PLS1 to PSL3G

Tubing Hanger

Tubing hanger is a mechanism used to support a tubing string in a tubing head. It is available with either threads (mandrel) or slip.

Tubing hanging devices are often very simple. In many cases they consist of only a threaded hanger with a seal assembly on the tapered outside part that presses against the corresponding tapered part of the tubing head. The hanger is held in place by tightened screws in the upper flange. A length of tubing is screwed onto the upper female threaded part of the hanger so that it can be positioned. HTD’s Tubing Hanger is designed as follows:

Size In	Bottom Thread	Top Thread	Back Pressure Valve
11 (Nominal) 10 3/4 X 7	New VAM / VAM Top	New VAM / VAM Top	6 5/16 Type "H"
11 (Nominal) 10 3/4 X 5	New VAM / VAM Top	New VAM / VAM Top	4 3/8 Type "H"
11 (Nominal) 10 3/4 X 4 1/2	New VAM / VAM Top	New VAM / VAM Top	4 1/2 Type "H"
11 (Nominal) 10 3/4 X 4 1/2	New VAM / VAM Top	New VAM / VAM Top	4 Type "H"