Wait and Weight method on Directional Wells

 Wait and Weight method on Directional Wells

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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.

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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.

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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.

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Conclusion

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

 

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New Apps for Well Control in Workover Operations

New Apps for Well Control in Workover Operations

In development for iPod, iPhone and iPad

(early 2018 on the App Store)

Workover Simulator

This application provides well control simulations on production wells in workover operations with coiled tubing and slickline on landing rigs for training in Oil & Gas.

A surface production well (vertical or directional) is used to practice basic operations like moving the coiled tubing into the tubing string and circulating a lesser density fluid, with density smaller that the formation equivalent density, to put the well in flow (underbalance condition) to well control practices: hydraulics calculations, swabbing (on tripping out) and control methods including static volumetric (lubricate and bleed) and bullheading.

Slickline Simulator

This application provides well simulation on production wells in workover operations with slickline on landing rigs for training in Oil & Gas.

A surface production well (vertical or directional) is used to practice basic operations like moving the slickline into the tubing string with tools to install and to retrieve specific plugs.

These plugs are installed and retrieved in two trips using slickline.

Coiled Tubing Simulator

This application provides well control simulations on production wells in workover operations with coiled tubing on landing rigs for training in Oil & Gas.

A surface production well (vertical or directional) is used to practice basic operations like moving the coiled tubing into the tubing string and circulating a lesser density fluid, with density smaller that the formation equivalent density, to put the well in flow (underbalance condition) to well control practices: volumes and hydraulics calculations, swabbing (on tripping out), etc.

 

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Slickline_Simulator_00

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Visit our Portfolio on the App Store

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

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

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http://www.oilgasware.com

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Drilling Simulator 3 – Complications during well control

Drilling Simulator 3

 designed for both iPhone and iPad

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Available_on_the_App_Store_Badge_US_UK_135x40_0824

User Guide for iPad Download PDF (51 MB)

Drilling Simulator 1:

– Drilling on vertical well, kick detection, shut-in, stabilisation of pressures (sidpp, sicp, kick volume), save to iCloud to import from other app “Well Control Simulator”.

Drilling Simulator 2:

all of drilling simulator 1 PLUS Direcional and horizontal wells, well control using 01 choke and 01 single kick bubble on borehole and graphical analysis.

Drilling Simulator 3 (New)

all of drilling simulator 2 PLUS:

1 – until 03 single kick bubbles on the borehole simultaneously

2 – standpipe manifold and choke manifold with 02 chokes and straight through

3 – Complications: failures schedule with Random option:

– Mud Pumps 1 and 2 “power end failure” or “fluid end failure”, 

– Chokes 1 and 2 “plugged” or “washed”, 

– One Drill Bit Nozzle “plugged” or “washed”

4 – Drill Pipe Float Valve (non-ported)

5 – Finger Gestures up/down to move the drill string (the kick is induced by swabbing effect for volumetric methods)

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Visit our Portfolio on the App Store

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

portfolio_2015_2

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

oilgasapps_website_640

or http://www.oilgasware.com

contact@wellcontrol.com.br

Drilling Simulator 3 – The Circulating System

Drilling Simulator 3

 designed for both iPhone and iPad

DrillSim3f_1024

Available_on_the_App_Store_Badge_US_UK_135x40_0824

Drilling Simulator 1:

– Drilling on vertical well, kick detection, shut-in, stabilisation of pressures (sidpp, sicp, kick volume), save to iCloud to import from other app “Well Control Simulator”.

Drilling Simulator 2:

all of drilling simulator 1 PLUS Direcional and horizontal wells, well control using 01 choke and 01 single kick bubble on borehole and graphical analysis.

Drilling Simulator 3 (New)

all of drilling simulator 2 PLUS:

1 – until 03 single kick bubbles on the borehole simultaneously

2 – standpipe manifold and choke manifold with 02 chokes and straight through

3 – failures schedule with Random option:

– Mud Pumps 1 and 2 “power end failure” or “fluid end failure”,

– Chokes 1 and 2 “plugged” or “washed”,

– One Drill Bit Nozzle “plugged” or “washed”

4 – Drill Pipe Float Valve (non-ported)

5 – Finger Gestures up/down to move the drill string (the kick is induced by swabbing effect for volumetric methods)

User Guide – Coming Soon

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

portfolio_2015_2

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

oilgasapps_website_640

or http://www.oilgasware.com

contact@wellcontrol.com.br

Kick Tolerance as Max Kick Volume – Free version!

Kick Tolerance (Lite)

A free version  for both iPhone and iPad!

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Download_on_the_App_Store_Badge_US_UK_135x40_0824

This app is applied on oil wells (drilling operations) and it provides the Kick Tolerance as maximum kick volume concept.

This is a limited version using the drill string just drill pipe and drill collar to help in the understanding of this kick tolerance concept. It is an useful tool for students on the well control schools, drilling engineering universities, etc.

For more features like maximum pore pressure concept, graphical analysis, choke line effects on deepwater, directional and horizontal wells, drill string w/ 5 sections, temperature gradient effects, data files, etc, check the full version available for sale on the our portfolio.

This app was developed based in existent spreadsheets. There is no comparison with any other software.

Our goal was to create an 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.

Thanks

iPhone version

kt_lite_10_02

kt_lite_10_03

iPad version

kt_lite_10_04

 

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

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

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Kick Tolerance on Directional Wells

Kick Tolerance as Maximum Kick Volume

on Directional Wells

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ktvol_01

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ktvol_02

ktvol_03

ktvol_04

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Mac version updated:

Available_on_the_Mac_App_Store_Badge_US_UK_165x40_0824

 

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.

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

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contact@wellcontrol.com.br

Well Control Volumetric Method for Mac

Volumetric Method for Mac

New version 1.1 for Directional Wells

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 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_05

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Volumetric_Method_07

Volumetric_Method_08

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Volumetric Method on Vertical Well

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Volumetric Method on Directional Well

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Lubricate and Bleed

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Graph Examples

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

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

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