12.4.26 PresTestType

Topic Version1Published11/11/2016
For StandardWITSML v2.0

Specifies the types of pressure test(s) conducted during a drilling report period.

Table 12.4.26-1 Attributes




leak off test


A leakoff test (LOT) is usually conducted immediately after drilling below a new casing shoe. The test indicates the strength of the wellbore at the casing seat, typically considered one of the weakest points in any interval. The data gathered during the LOT is used to prevent lost circulations while drilling. During the test, the well is shut in and fluid is pumped into the wellbore gradually to increase

the pressure on the formation.

formation integrity test


To avoid breaking down the formation, many operators perform a formation integrity test (FIT) at the casing seat to determine if the wellbore will tolerate the maximum mud weight anticipated while drilling the interval. If the casing seat holds pressure that is equivalent to the prescribed mud density, the test is considered successful and drilling resumes.



The value is not known. Avoid using this value. All reasonable attempts should be made to determine the appropriate value. Use of this value may result in rejection in some situations.

Table 12.4.26-2 Associations



From: PresTestType.

To: TypeEnum



From: DrillReportStatusInfo.

To: PresTestType