Бурение грунтовых зондов, установка энергетических колодцев

A primary cement job can be considered a failure if the cement does not isolate undesirable zones. This will occur if:

• The cement does not fill the annulus to the required height between the casing and the borehole.

• The cement does not provide a good seal between the casing and borehole and fluids leak through the cement sheath to surface.

• The cement does not provide a good seal at the casing shoe and a poor leak off test is achieved

When any such failures occur some remedial work must be carried out. A number of methods can be used to assess the effectiveness of the cement job. These include:

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