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 App Directional Drilling Hydraulics

Directional Drilling Hydraulics

Designed for iPhone and iPad
Now available on the App Store

DD Hydraulics

 

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The Directional Drilling Hydraulics provides to directional drillers, drillers, tool pushers, engineers, chemists, students and other professionals in the petroleum industry a productivity tool helpful in drilling of oil wells for hydraulic calculations on directional and horizontal wells, optimization of the penetration rate and useful to help on the decision on selection of bit nozzles.

This App can import data files from App “Directional Drilling” and others available in our portfolio on the App Store:

– Directional Drilling

– Drilling Hydraulics 1 and 2

– Drilling Simulator 1, 2 and 3

– Leak-Off Test Simulator

– Kick Game

– Kick Tolerance

– MPD Simulator

– Well Control Methods

– Well Control Simulator

iPhone X version

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iPad Version

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Visit our Portfolio on the App Store

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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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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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DS3_80

DS3_81

DS3_82

DS3_83

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DS3_86

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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.

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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

drillsim_10_c9_01

drillsim_10_c9_03

drillsim_10_c9_04

drillsim_10_c9_05

drillsim_10_c9_06

drillsim_10_c9_07

drillsim_10_c9_08

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 – A new project for iPhone and iPad with advanced features

Drilling Simulator 3

 designed for both iPhone and iPad

DrillSim3f_1024

Available_on_the_App_Store_Badge_US_UK_135x40_0824

updated: 24 Nov 2016

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”

screenshots on iPad Pro 12.9 inch:

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drillsim3_10_02

drillsim3_10_03

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screenshot on iPhone 6 Plus:

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drillsim3_10_02i

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drillsim3_10_04i

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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.

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or http://www.oilgasware.com

contact@wellcontrol.com.br

Casing Setting – A new app for iPhone and iPad

Casing Setting

for iPhone and iPad

version 1.0

casing_setting_plot

Available_on_the_App_Store_Badge_US_UK_135x40_0824

 

This app provides the casing shoe depths calculations based on formation pore pressure gradient and fracture pressure gradient using both concepts “bottom-up” and “top-down” and also analysis of the kick effects on the casing setting.

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:

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iPad Version:

cs_10_01_1

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cs_10_02_1

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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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