What is a DFIT?
What is a DFIT?
In a diagnostic fracture injection test (DFIT), a relatively small volume of fluid is injected into the subsurface, creating a hydraulic fracture. For example, the simplest pressure transient tests are production or injection tests, in which fluid is injected or extracted at constant rate from the well.
How do you calculate a leak off test?
Leak off test in equivalent mud weight = (Leak Off Test pressure ÷ 0.00981 ÷ Casing Shoe TVD ) + (Current Mud Weight)
- Leak off test in equivalent mud weight in kg/m3.
- Leak Off Test pressure in KPa.
- Casing Shoe TVD in m.
- Current Mud Weight in kg/m3.
What is formation integrity test?
A Formation Integrity Test (FIT) is a test of the strength and integrity of a new formation and it is the first step after drilling a casing shoe track. An accurate evaluation of a casing cement job and of the formation is extremely important during the drilling of a well and for subsequent work.
What is shoe track?
The shoe track is the space between the float or guide shoe and the landing seat of the cementing wiper plugs. Using a good thread lock system prevents casing joints from loosening while drilling out the shoe track.
What does a leak off test prove?
A test to determine the strength or fracture pressure of the open formation, usually conducted immediately after drilling below a new casing shoe. The results of the leakoff test dictate the maximum pressure or mud weight that may be applied to the well during drilling operations.
How do you calculate pressure leak?
