Understanding Aquifer Influx Models and Solutions

Explore various aquifer influx models such as Schilthuis, Hurst's modified steady-state, and the van Everdingen-Hurst unsteady-state. Learn about the challenges with the Schilthuis model and how to determine unknown constants. Dive into solutions and examples to enhance your understanding.

• Aquifer
• Influx Models
• Solutions
• Schilthuis
• Hurst

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1. Lecture-4 aquifer influx models Pot aquifer Schilthuis steady-state Hurst s modified steady-state The van Everdingen-Hurst unsteady-state Edge-water drive Bottom-water drive Linear-water drive The Carter-Tracy unsteady-state Fetkovich s method Radial aquifer Linear aquifer

2. Do you know Farouk Al Kasim?

3. Problem-1 Tarek Ahmed

4. Water influx constant or

5. Problem-3 Schilthuis

6. Water influx models Hurst s modified steady-state model. The problem with the Schilthuis steady-state model is that the water is drained from the aquifer, the aquifer drainage radius ra will increase as the time increases. Hurst (1948) proposed that the aquifer radius ra will be a function of time. Dimensionless radius Schilthuis model will be

8. Determination of the two unknown constants a and C.

9. Example 10-5 Hurst

10. Solution

11. Solution

12. Solution Using any point at the straight line to find the constant a

13. Solution

14. The van Everdingen-Hurst unsteady-state Dimensionless diffusivity equation Van Everdingen-Hurst They solved diffusivity equation for Water influx by applying the laplace transformation

15. The constant terminal presssure at the initial and outer boundary condtions The Van Hurst assumed that the aquifer is characterized by:

17. Water does not encroach on all sides of the reservoir, or the reservoir is not circular in nature.

20. Example 10-6 Van Everdingen and Hurst

22. Use table 10-1 (Tarek Ahmed), take the average of WeD between two points of tD if the given tD is in between. What is wrong here ? Then calculate the cumulative water influx by:

23. See you next time inshallah HAVE A NICE TIME