Welcome to drill-byte! This is a web site dedicated to all kinds of stuff related to the drilling design and analysis.
For the moment you can download, for free, an excel spreadsheet for directional drilling design, one for Torque & Drag analysis, one for wellhead pressure calculation for well full of gas, a kick tolerance calculator, and one for tension capacity of the API connections and tubes under applied torque.
In the future you'll find software for the stress calculation for tubing landed in packers, for casing centralization and design, balanced cement plugs, risk analysis, for drilling operations benchmarking.
I appreciate if you would send me your comments regarding the programs, especially about the degree of matching the actual data collected in the field, along with the permission to publish them on my website.

Last updated: 11 February 2021
As some users disregarded my copirights and cracked the spreadsheets protection, the programs were removed.
No more free stuff! These programs were supposed to be used as they are.
Therefore, the next step will be the implementation of these programs in a web-based lanuage, in a client-server architecture.
The users (pay per run or membership) will be able to fill in the data in their web browser and the updated programs will run on a server.
Then, the user will get a temporary link which will point to its output files.

Update: 27 August 2015
Released new Survey 64 bits compatible Office 2013. Encloses User Manual
Released new Torque & Drag 64 bits (beta version), compatible Office 2013
Fixed issues in Torque & Drag and in SURVEY