Definition - What does Surface Pressure mean?
Surface Pressure is the pressure near the surface or at the surface of a well is known. A pressure gauge is used to measure the pressure in the production string below the shut-in valve. It is also known as tubing head pressure. Digital pressure gauges are also used to measure Surface Pressure. Surface Pressure can be expressed by the following formula:
Surface Pressure = Hydrostatic Pressure – Bottom Hole Pressure
Petropedia explains Surface Pressure
Surface Pressure is measured by pressure measuring instruments known as pressure gauges. The recent developments of digital gauges have proved to be helpful in transient testing of Surface Pressure. There are different types of Surface Pressure that can be understood:
- The Surface Pressure when is at its maximum value is known as Maximum Anticipated Surface Pressure (MASP). This is the maximum pressure that can occur during the well construction.
- Expected Surface Pressure – This is the highest predicted pressure that is to be exerted upon the surface of a well. The reservoir pressure is also considered during the calculation of expected surface pressure.