How do you measure the temperature of a borehole?
How do you measure the temperature of a borehole?
Heat-flow measurements in boreholes are made by combining sets of temperature and thermal-conductivity data by the formula Q = K(dt/dz), where Q is heat flow, K is thermal conductivity, and t is temperature at depth z.
How do you calculate bottom hole pressure from wellhead pressure?
Determine Bottom Hole Pressure from Wellhead Pressure in a Dry…
- Pwh = wellhead pressure in psia (absolute pressure)
- H = true vertical depth of the well.
- Sg = specific gravity of gas.
- R = 53.36 ft-lb/lb-R (gas constant for API standard condition air)
- Tav = average temperature in Rankin (Rankin = Fahrenheit + 460)
How is formation temperature calculated?
Formation temperature = (ambient surface temperature ) + (temperature gradient x Well TVD)
- Formation temperature in F (Fahrenheit)
- ambient surface temperature in F (Fahrenheit)
- temperature gradient in F/ft (Fahrenheit / ft)
- Formation Temperature, °F = 90 °F + (0.015 °F/ft x 12,000 ft)
How do you calculate hydrostatic pressure?
The pressure in a liquid at a given depth is called the hydrostatic pressure. This can be calculated using the hydrostatic equation: P = rho * g * d, where P is the pressure, rho is the density of the liquid, g is gravity (9.8 m/s^2) and d is the depth (or height) of the liquid.
What is a bottom hole well?
The bottomhole is the lowest or deepest part of a well. Drillers use mud pumps to circulate drilling fluid through the central well annulus to the bottomhole of the peripheral well. These data sets could be acquired at any location in the wellbore from the bottomhole or bottom of the well to the wellhead.
How accurate are temperature estimations for bottom hole temperature?
Estimations deviated within 3.6% to 25.2% in Case 1 and 1.5% to 24.5% in Case 2. It was observed that some studies require formation temperature for bottom hole temperature estimations and some others require the reverse. There also some models which use the well depth or formation temperature gradient as features for accurate predictions.
What is bottom hole circulating temperature (bhct)?
Two of the most critical measurements during and after drilling a geothermal well are the bottom hole circulating temperature (BHCT) and the static formation temperature (SFT). BHCT is critical for bottom hole assembly (BHA), drilling fluid and cement slurry designs.
What is downhole temperature prediction in geothermal drilling?
1. INTRODUCTION AND BACKGROUND During drilling and completion of geothermal wells, it is essential to predict the downhole temperature of drilling fluid and cement systems as well as the temperature of downhole formations for adequate design and composition of drilling fluids, cement slurries, and the bottom hole assemblies.
What does bhct and SFT measure in geothermal drilling?
Keywords:machine learning, bottom hole temperature, formation temperature, drilling fluids ABSTRACT Two of the most critical measurements during and after drilling a geothermal well are the bottom hole circulating temperature (BHCT) and the static formation temperature (SFT).
