What Does Bottom Hole Treating Pressure (BHTP) Mean?
Bottom hole treating pressure (BHTP) can be defined as the pressure of the liquid inside the wellbore at the perforations at the bottom of a well that will fracture the rock. BHTP indicates the real-time progress of a fracturing job and hence is very important.
In certain wells, the BHTP is directly measurable while in some wells the BHTP is measured indirectly using the surface pressure and estimates of pipe friction and hydrostatic head.
Trenchlesspedia Explains Bottom Hole Treating Pressure (BHTP)
BHTP is associated with hydraulic fracturing or fracking and is used to release oil and gas from sub-surface rock. BHTP can be calculated based on rock conditions, properties of the fracking liquid and depth below the surface. BHTP can be calculated using the formula:
BHTP = fg x depth + excess pressure
Where; fg is the fracking gradient, and excess pressure refers to the added pressure required to propagate the fracture once the crack has begun.
The importance of BHTP for a fracking project is thus evident since it allows further calculations to determine fluid pressure that will be required at the surface of the well to achieve the BHTP.