Few Advantages Of Using Cementing Plugs
After the casing is run into the well, a cementing head is hooked to the highest of the wellhead to receive the slurries from the pumps. Plugs square measure used throughout cementing operations to assist take away spread mud and dust sheath from the casing inner diameter and minimize the contamination of cement. There square measure 2 wiper plugs, i.e. bottom plug and high plug conjointly called cementing plugs. All-time low of the plug is wired previous the cement suspension and behind the spacer WHO wipes any remaining spread mud from the inner diameter of the casing because it moves down the string.
The mud within the casing is very important to be removed as a result of it prevents mixture the drilling fluids with the cement slurries. Once all-time low plug seats at the float collar, differential pressure ruptures a diaphragm on the plug, permitting cement to flow through, flip the corner at all-time low of the opening or toe finish of a horizontal well. It fills the criminate area between the casing and therefore the formation.
Top and bottom plugs same as Cementing Plugs square measure continuously completely different colors. The color for bottom plugs and high plugs differs from company to company although. Once the complete volume of cement has been wired, a high plug is born and wired behind the suspension from the inner diameter of the casing and so seats at the float collar. It helps in resting on all-time low plug and inflicting a pressure increase at the surface indicating that the cement has been displaced.
Trouble with Cementing Plugs:
If you discover out that wiper plugs from different totally completely different completely different} firms have different diaphragm burst ratings, it may be a bother. Plugs being exposed to the sun and harsh climatic conditions square measure sure enough an indication of poor quality that results in a deteriorated and cracked rubber. Burst ratings for the plugs the operator was exploitation ranged from a hundred and fifty to 250 psi.
In some cases wherever heavyweight pipe was used, the diaphragms burst untimely if not wiped the casing properly to the float shoe. In such cases, all-time low plug of Cementing Plugs were left somewhere up the casing till the highest plug arrived and pushed it down. Now, once the rest of the casing is wiped and therefore the mud from the walls accumulated within the shoe joint or round the casing shoe space and everything gets settled.
The pressure on the cement being wired into the well will increase till a diaphragm is broken among all-time low plug. It permits the suspension to flow through it and up the skin of the casing string. When the method of bottom plug, the highest plug reaches all-time low plug, the pumps square measure turned off and therefore the cement is allowed to line. The time taken for the cement to harden is named thickening time. The thickening time is additionally counted for the setting wells at deep depths, underneath hot temperature or pressure in corrosive environments and special cements square measure used. Each the Cementing Plugs work with the correct quantity of co-ordination so, the standard matters plenty.
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