1. Mandrel hanger
The mandrel (i.e. threaded) casing hanger is equivalent to a casing collar. It is convenient to hang the casing without cutting the casing (both W and WE types are required), and the casing can be hung without even opening the blowout preventer, solving the wellhead suspension sealing problem. However, it is necessary to calculate the depth of the casing to avoid touching the bottom. It is generally used in relatively stable production wells. Generally, the mandrel (threaded) hanger is used with a threaded casing head, and the corresponding slip hanger can also be replaced. The sealing principle of the mandrel hanger with metal and rubber seals of the casing head is the same as that of the mandrel hanger with metal and rubber seals of the tubing head.
2. Slip hanger
a. Structure of the slip hanger:
The slip hanger is mainly composed of slip teeth (four equal parts), slip seats (two equal parts), rubber seals (two equal parts), and support seats (two equal parts).
b. Working principle of the slip casing hanger:
The two halves of the slip hanger are combined to hold the casing and put into the casing head hole as a whole, so that the slip teeth are tightly clamped on the casing. Under the action of the casing's own weight and the taper of the slip teeth, the slip teeth are wedged tighter and tighter, making the slip teeth clamp tighter and tighter on the casing. The rubber seal is deformed under the action of its own weight to form a seal between the casing and the casing head body.
c. Inverted slip hanger
The inverted slip hanger seat is bolted to the lower part of the casing head body. The slip is lowered after the casing is installed into the BT sealing ring, so that the slip teeth are tightly clamped on the casing. Under the action of the casing's own weight and taper, the slip teeth are wedged tighter and tighter, making the slip teeth clamp tighter and tighter on the casing.
Slip Casing hanger
1. WE type slip hanger:
Generally speaking, the WE type slip hanger is used for the surface layer, and its characteristics are: large size, and the sealing annulus pressure is not too high (compared with the W type). Another situation is that the casing cannot be lifted or lowered due to cementing (this is a prerequisite for the W-type hanger). WE can remedy this by installing and sealing passively (casing does not move, hanger seals actively, and seals are activated manually rather than by hanging weight). If factors such as hanging weight and sealing are not strictly considered, WE and W types with the same size and the same manufacturer can generally be interchanged.
2. W-type casing hanger
Compared with WE type, it relies on drilling column hanging weight to activate sealing. Its characteristics are: the largest hanging tonnage, better sealing, and more reliable. It is generally used for the suspension of technical casing.
3. WD type hanger
Only used for surface casing head, the lower part is connected to the surface casing.
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