| CPC E21B 45/00 (2013.01) [E21B 43/34 (2013.01); E21B 47/06 (2013.01); E21B 49/003 (2013.01); G01V 5/04 (2013.01); G06N 3/048 (2023.01); G06N 3/08 (2013.01); E21B 2200/20 (2020.05); E21B 2200/22 (2020.05)] | 18 Claims |
|
1. A method for determining a real-time pore pressure log of a well in a reservoir, comprising the steps:
storing existing data logs, which includes surface drilling parameters, data obtained from logging while drilling (LWD), and mud gas data, of existing wells in a database, wherein the mud gas data comprises chemical composition of a mud gas mixed with a drilling mud,
storing existing pore pressure logs of the existing wells in the database, wherein the existing pore pressure logs correspond to the existing data logs,
determining a relationship between the existing data logs and the existing pore pressure logs,
drilling a new well into the reservoir,
determining new data logs, which includes surface drilling parameters, data obtained from LWD, and mud gas data, of the new well while drilling the new well,
inputting the chemical composition of the mud gas together with the LWD data and the surface drilling parameters from the new data logs of the new well into the relationship to output an estimated pore pressure while drilling the new well,
determining a real-time pore pressure log of the new well by outputting the estimated pore pressure at a certain depth by the relationship while drilling the new well, and
adjusting dynamically, using the real-time pore pressure log, a weight on a drill bit and properties of the drilling mud during the drilling of the new well.
|