Hello everyone,

I needed little advice please. Whenever I plot deliverability plot on Cartesian plot on paper.

log (Pi2-pwf2) vs log qsc . I end up messing value exact value of c.

Can anyone help me on how to find exact value of c? any short cut graphically for paper plotting?

where I can be sure that values I am finding graphically are 100 % correct?

I usually have two values of data present.

Thankyou