How do you calculate maximum allowable casing pressure?

How do you calculate maximum allowable casing pressure?

The Maximum Allowable Annular Surface Pressure (MAASP) equals the formation breakdown pressure at the point under consideration minus the hydrostatic head of the mud/or influx in the casing.

How is standpipe pressure calculated?

Stand Pipe Pressure Or Pressure Loss (Friction Pressure) Calculations

  1. PP = PDS + PB + PA.
  2. PP : pump pressure, psi.
  3. PDS : drill string friction pressure, psi.
  4. PB : drilling bit pressure drop, psi.
  5. PA : annulus pressure, psi.

How do you calculate final circulation pressure?

FCP = SCR x KWM ÷ OMW FCP is final circulating pressure in psi. SCR is slow circulating rate in psi.

How do you calculate surface pressure drill?

Determine the maximum surface pressure. Drill well with water based mud. Determine kill weight mud with this equation: KMW = current mud weight + (drill pipe pressure ÷ (0.052 x Hole TVD)). You need to round the kill weight mud up; therefore, KMW is 13.0 ppg.

How do you calculate pore pressure in drilling?

The basic steps in performing a conventional 1D pore pressure analysis are:

  1. Calculate total vertical stress (σv) from rock density.
  2. Estimate vertical effective stress (σe)from log measurements (DT or RES) or seismic (velocity).
  3. Pore pressure is then PP = σv – σe.

When should MAASP be recalculated?

While LOT, MAASP is equal to the surface leak off pressure for the test fluid density. Since the maximum allowable mud density is a fixed quantity here, thus, MAASP should always be recalculated whenever the mud density changes.

What is stand pipe pressure?

Stand Pipe Pressure, abbreviated as SPP, is defined as the total frictional pressure drop in the hydraulic circuit. SPP, an important drilling parameter in selecting proper mud weight, can be calculated using different rheological models. Different rheological models are used for char- acterization of a drilling fluid.

What is pressure loss in drilling?

A mud pump creates power to move drilling fluid from point A to C and the frictional pressure or pressure loss is the amount of pressure required to transfer fluid. This tells you that you need 2,000 psi to overcome the frictional pressure in order to move the fluid from point “A” to point “C”.

What is wait and weight method?

Wait and Weight Well Control Method or someone calls Engineer’s Method is a method to control well with one circulation. Kill weight mud is displaced into drill string and kick (wellbore influx) is removed while displacing a wellbore.

What is the shut-in drill pipe pressure?

When the annulus pressure first begins to increase, the drill pipe pressure at that instant is the shut-in drill pipe pressure.

How do you measure the pressure in a drill pipe?

A float in the drill string complicates the determination of the drillpipe pressure;however, it can be readily determined by pumping slowly on the drillpipe and monitoring both the drillpipe and annulus pressure. When the annulus pressure first begins to increase, the drillpipe pressure at that instant is the shut-in drillpipe pressure.

What is the difference between drill pipe pressure and shut in casing?

In most cases, the shut in casing pressure is greater than the drill pipe pressure. The difference between these two pressures will increase when the volume of influx increase. If the drill string is fitted with float valve, the reading of the drill pipe pressure become difficult.

What is the kill mud density in a drill pipe?

The shut in drill pipe pressure can be considered as the pressure stabilized when noticing the casing pressure increase. The kill mud density is defined as the required density to deliver a hydrostatic pressure to balance the pore pressure.