Kick Tolerance as Maximum Kick Volume

New app for Complex Wells – 3D Directional

for iPhone and iPad 


A useful tool for Oil & Gas students and professionals to calculate the Kick Tolerance on vertical and 3D directional wells. It provides a 3D well planning creation tool.

The Kick Tolerance provides to drilling engineers, chemists, students and other professionals in the petroleum industry a productivity helpful tool in the drilling operations (well control) and well planning step of oil wells. 

This application deals the concept: 

– Kick Tolerance as Maximum Kick Volume. 

The Kick Tolerance calculations as maximum kick volume can be applied on vertical and 3D directional wells.

It provides a 3D well planning creation tool like our app “Directional Drilling”.

Compatibility with high resolutions screens of iPad Pro 12.9 inches and iPhone XS Max.

Please, you can contribute for improvements. Report bugs and suggestions to


Wait and Weight method on Directional Wells

 Wait and Weight method on Directional Wells


During drilling operations on oil wells, there may to occur the inflow of formation fluids into the well, which is an undesirable condition. The driller should detect such events and shut-in the well immediately and to record informations corresponding to stabilization of pressures SIDPP (Shut-in Drillpipe Pressure) and SICP (Shut-in Casing Pressure) and the volume gain.

There are two methods more used to well control when the drill string (drill bit) is in the bottom of borehole (normally on drilling when reaches a formation with pressure bigger relative to the bottom hole pressure): The Driller’s Method and the Wait and Weight Method (also named Engineer ‘s Method).

The Driller’s Method is performed with two circulations. The first circulation with the original fluid to circulate the influx out of well and the second circulation to fill the borehole with a new fluid. This method can be started immediately after shut-in the well.

The Wait and Weight Method is performed just with a single circulation with the new fluid, but is necessary to wait a lag time until to prepare the new fluid to start the method.

The choice of the method

The choice between these two methods is a controversial question among professionals of oil & gas, but if the rig has already the new fluid available to control the well (the hydrostatic pressure of the new fluid is equivalent to the formation pressure), the Wait and Weight method is aplied and the control will be just with a single circulation in two steps:

Wait and Weight Method

Step 1

Replacing the original fluid in the drill string with the new fluid circulating until the drill bit. Start pump and bring the pump speed until the slow circulation rate, keeping the circulating pressure according the table “Pressure versus Pumped Strokes”, starting with the Initial Circulating Pressure (ICP) and ending with the Final Circulating Pressure (FCP).

ICP = SIDPP + Circulating Pressure @ Slow Circulating Rate (recorded previously).

FCP = Pressure(@ scr) x New Fluid Density / Original Fluid Density

Vertical Wells

On vertical section, the rate “pressure drop / stroke” is constant and the calculations can be made in 10 steps.



Directional Wells

On deviated section, starting on Kick-Off Point (KOP), the rate “pressure drop / stroke” is not constant. The calculations will consider the steps by 100 strokes each.




Step 2

Continue the circulation with the new fluid to fill the all annular until the surface keeping the circulating pressure constant equal to FCP – Final Circulating Pressure.

Operational Limits

It is very important to monitor operational limits during the circulation to avoid fracture of the formation, usually at the shoe depth of the last casing.

The advantage of the “Wait and Weight” method is to provide a lower resultant pressure at the shoe depth before the gas reaches the shoe depth, that is, when the new fluid passes through the drill bit, increasing the hydrostatic pressure in the annulus before of the gas to reach the shoe depth.



The Wait and Weight method is advantageous when the rig has already the new fluid available to immediate circulation. Normally the new fluid need a lag time to be prepared. (1) On well closed, an influx of gas is moving up continuously and pressurizing the borehole all the time. (2) The calculations to control directional wells are relatively complex.

If it is not possible for the new fluid to reach the annulus before the gas reaches the shoe depth, due to (1) the lag time to prepare the new fluid or (2) the volume of the drill string is greater than the volume of the annulus above the gas until the shoe depth or (3) the difficulty to calculations on directional wells or (4) formations with low fracture pressure on deepwater for example, it is recommended choose the “Driller’s Method” to start immediately after the shut-in the well, holding the circulation pressure equal to Initial Circulating Pressure until the circulation of the total volume of the annulus and to replace the fluid only in the second circulation of this method.

I hope that this simple explanation about the Wait and Wait method on directional wells helps on choicing the method most efficient.


Well Control Methods apps: 

iOS and Mac

iOS ( FREE! )

iOS and Mac

iOS and Mac

iOS and Mac

Well Control Worksheets apps:

iPad ( FREE! ) Mac

iPad and Mac

iPad and Mac

iPad and Mac


Visit our Portfolio on the App Store

for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Visit our website for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Kick Tolerance on Directional Wells

Kick Tolerance as Maximum Kick Volume

on Directional Wells
















Mac version updated:



iPhone and iPad versions – new update optimized for directional wells coming soon:

iPhone iPad
Available_on_the_App_Store_Badge_US_UK_135x40_0824 Available_on_the_App_Store_Badge_US_UK_135x40_0824


Visit our Portfolio on the App Store for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Visit our website for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Well Control Volumetric Method for Mac

Volumetric Method for Mac

New version 1.1 for Directional Wells


 for iPhone, iPod touch and iPad for Mac
Available_on_the_App_Store_Badge_US_UK_135x40_0824 Available_on_the_Mac_App_Store_Badge_US_UK_165x40_0824

This application uses the basic calculations of the Volumetric Method to control oil wells after the occurrence of kick during drilling operations on landing rigs (Onshore).

It is an useful tool to import data files to fill kill sheets from our apps: (Drilling Hydraulics, Drilling Simulator 1 and 2, Kick Tolerance, LOT Simulator and Well Control Simulator 1 and 2) available for sale in our portfolio on the App Store.

It is can be applied on the field and also help in the understanding of the Volumetric Method of well control.

This app was developed based on existing spreadsheets. There is no comparison with any other software.

Our goal was to create a low-cost application with the help of experts to share with drilling engineers, technicians, drillers, students and teachers of drilling engineering.

There is no intention to replace the professional softwares.

You can contribute with suggestions for improvements, correcting the translation to english, reporting bugs and spreading it to your friends.






Volumetric Method on Vertical Well



Volumetric Method on Directional Well




Lubricate and Bleed


Graph Examples


Visit our Portfolio on the App Store for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Visit our website for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Drilling Simulator 2 – Optimized for horizontal and directional wells

Drilling Simulator 2

Drilling with Well Control

Optimized for iPad Pro and iPhone 6 Plus

Version 1.2 – Optimized for horizontal and directional wells



User Guide

This is a basic drilling simulator that simulates drilling operations based in panels for kick detection, shut-in the well, stabilization of pressures and the choke operations during the well control operations using a hydraulic choke panel simulator.

This is a new project based on apps “Drilling Simulator” and “Well Control Simulator” available in our portfolio on the App Store.

Additional features:
1. Driller Interface based on Pressure Gauge, Weight Indicator, Rotary Torque gauge and Geolograph.
2. Choke Interface based on Hydraulic Choke Panel.
3. Graph in full screen (with background color in black or white) for analysis.
4. Pre-recorded data form
5. Three codes (admin, instructor, student) to view the gas into the borehole, the pressure at bottom, at shoe and at bop and to enable / disable the Lag Time (by adjusting the choke to change the kill pressure and drill pipe pressure, etc).

Other features also available:

A graphical very useful tool for training of roughnecks, derrickman, drillers, toolpusher, drilling engineers and students in the well control procedures.

– Ability to drilling, kick detection, shut-in, stabilisation of pressures;
– Interactive System: no pre-set methods;
– Ability to apply control methods: Driller’s method, wait and weight, dynamic volumetric and static volumetric (lubricate and bleed);
– Hydraulics and Hydrostatics;
– Behavior of the kick;
– Applied with subsea stack or surface stack;
– Set well with until 4 sections: riser, casing, liner, open hole ;
– Set Drillstring with drillpipe1, drillpipe2, heavy weight, drillcollar1, drillcollar2

Others apps very useful of our portfolio for Well Control:

– Drilling Hydraulics
– Kick Tolerance
– Leak-Off Test Simulator
– Leak-Off Test Analyzer
– Well Control Methods
– Well Control Worksheets
– MPD Simulator
These tools can complement (work with) this simulator by creating files which can be used in this application;

– This simulator is limited and is not applied to some complex situations.
– Visit the website for User’s Guide.

Please, report us bugs and suggestions for improvements.

Screenshots on iPad Pro







Directional Type on iPhone:




Visit our Portfolio on the App Store for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.


Visit our website for more Oil & Gas apps for iPhone, iPod Touch, iPad and Mac OS X.