Leverett J-function

[@jura_rose]

Dear Martin, I am a past student of yours at Imperial College. It is a delight to see you share your knowledge with the world in this way. Many students, professionals and everyday people can learn so much from your lectures here on KZbin. Thank you for taking the time sir. All the best.

[@HuongNguyen-or6wz]

I am glad that I found your channel. Thanks for all your lectures. It helps me a lot.

[@geosamways]

Thanks Martin! That has been a great help. I am always amused by comments like "it's simple algebra", which it probably is to somebody who doesn't have a mental block on algebra!

[@domingosmucuanha2449]

Excellent class. I am interested in knowing how one can use j function modeling to calculate the thickness of transition zone. In other words what are the criteria to use transition zone thickness to come up with j function modeling .???

[@BoffyBlunt]

You can use the J-function to estimate the saturation as a function of height in the transition zone. The capillary pressure is the density difference between water and oil times the acceleration due to gravity times height above the free water level. You find the saturation whose capillary pressure gives this value - the J-function allows you to account for variations in local porosity and permeability.

[@ebenquaynewton2491]

Please how did the " 2 " in the capillary pressure equation disappear in the J- function equation ?

[@BoffyBlunt]

This is accounted for in the J-function. The function J is a dimensionless form of the capillary pressure.

[@ebenquaynewton2491]

@@BoffyBlunt okay, thanks 👍

[@ahmedadnanaziz2005]

amazing

[@rahuljoshi5000]

For any elevation in reservoir, capillary pressure is independent of rock type depending only on fluid density difference. The rock types affect Sw distribution. Scaling capillary pressure curve is physically incorrect way of dealing with the problem; instead J function using Pc should be used to allocate Sw.