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Cementing plugs help solving integrity problems

2018-01-26 10:54:05

Cementing operation is one of the most detailed works which requires complete attention regarding well integrity. Since it is a critical job, it requires a lot of research and the large number of operations throughout the years but yet it faces integrity problems during and after cementing jobs. Cementing Plugs help solving such problems especially for the petroleum industry globally and can occur at any moment of the well’s life cycle. Well integrity issues categorized according to the moment at which happens:

 

Non Rotating Top Cementing Plug

 

1. While the cement displacement in the wellbore

During the period between 1992 and 2006, the leading cause for blowouts was cementing. The first category results in very serious well-control problems including blowouts. These problems firstly occur because of the improper design of the cementing operations and due to hydrostatic pressure of the cement slurries. The failure during the process of mixing slurries obtains the desire density and lost circulation during the cement displacement.

 

2. After the cement placement

In the second category, the loss of hydrostatic pressure of the cement slurries causes problem during the initial hydration period. The problems may rise because of the mismanagement. It can cause pressure build up in the annulus between the casing strings and zonal isolation, we control problems and the remedial solutions for this are normally expensive and difficult.

 

3. After the cement has been cured

In the third category, the problems that occur are more long-term normally caused by poor cementing jobs. Defective drilling mud removal during the cement slurry displacement in the annulus, insufficient cement height that may lead to casing leakage and corrosion problems are some of the causes. Cementing Plugs can contribute to long-term well integrity failures, otherwise, the cost to fix these problems are highly expensive.

 

 



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