Why Use Cementing Plugs For Well

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Slide 1:

Why Use Cementing Plugs For Well?

Slide 2:

The production designers at the recent times are quite developed and well read, they are knowledgeable to understand the consequences of temperature during the drilling process. Earlier the engineers used to deny the consequences of temperature as the constant bottomhole flowing temperature throughout the production tubing.

Slide 3:

It present , deepwater wells are encountering a lot of extreme temperature and pressure conditions which is one of the key reasons to such dirt. According to the professionals, one should maintain the well’s temperature but that is quite difficult to do as predicting circulating temperature is more critical due to weak formations and Cementing Plugs will provide the presence of risers and choke/kill/boost lines.

Slide 4:

Why Use Cementing? Cementing is used for a number of reasons but primarily to protect and seal the wellbore. It prevents the preventing water penetration into the well and immobilizing the casing. Deepwater drilling and high pressure/high temperature wells have had a change of perspective in engineers.  Cementing Plugs  are also used in areas where there is a reduction of flow within a well and it can extend to plugging a well for abandonment.

Slide 5:

Plugs are used during cementing operations to help remove dispersed mud and mud sheath from the casing inner diameter. It minimizes the contamination of cement and wipes any remaining dispersed mud from the inner diameter of the casing as it moves down the string. The effect of temperature on cementing has long been recognized and the recent professionals always keep that in mind because the correct determination of retarder can be critical.

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How Does It Work? Using a bottom plug, cement slurry, a top plug and drill mud, the cement is pumped down in the casing pipe. The pressure of the drill mud forces in moving the cement slurry through casing, fills the space between outside the casing and the hole. Then, the cement is given some time to get hardened and after testing the hardness, alignment and a proper seal, it is declared to be completed.

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Some Precautions During The Process: .The water density is not particularly sensitive to temperature and pressure, the extensive use of water-based drilling fluids is efficient. The surface-measured mud weight does not vary much in conventional wells, though the oil-based or synthetic oil-based muds are very sensitive to temperature and pressure. .The intermediate-string cementing is focused on achieving a great cement job and drilling and it is not an issue of temperature and pressure.

Slide 8:

To get the high wiping efficiency, the top and bottom cementing plugs are designed to remove mudcake , mud film, rust and mill scale during cementing operations. Innovative design enhances drill-out efficiency to submit non-rotating cementing bottom plugs. The subsurface Cementing Plug System is used remotely to release cementing plugs at a selected subsurface depth.

Slide 9:

When the bottom plug seats at the float collar, it allows the cement to flow through and turn the corner at the bottom of the hole or toe end of a horizontal well. It helps in filling the annular space between the casing and the formation.

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