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Tuesday, January 18, 2011
Friday, January 7, 2011
Driller's Method - formulas used in application WCMethods for iPhone
Well Control Methods applied on the drilling of the oil wells
Description
This application uses the basic calculations of the methods to control oil wells after the occurrence of kick during drilling operations on floating platforms and land rigs.
This full version is completely interactive and allows users to define a wide variety of parameters for oil wells and unit system, save data and more.
It is can be applied in the field of petroleum and also help in understanding the methods of well control.
Well Control Methods:
1. Driller's Method
2. Wait and Weight
3. Dynamic Volumetric
4. Static Volumetric - Migration / Bleed
5. Static Volumetric - Lubrication / Bleed
2. Wait and Weight
3. Dynamic Volumetric
4. Static Volumetric - Migration / Bleed
5. Static Volumetric - Lubrication / Bleed
The Driller's Method
During drilling operation of oil wells, there may be inflow of formation fluids into the well, which is an undesirable condition. The driller should detect such events and closing the well immediately. Record information after the closing of the well corresponding to stabilization of pressure, volume gain, SIDPP (Shut-in Pressure Drillpipe) and SICP (Shut-in Casing Pressure. In the case of operations on floating units, this term could be redefined as Shut-in Choke Pressure).
The control method to be applied is the driller's method. That is to circulate the influx even with the original weight of the mud, keeping constant the circulation pressure named ICP - Initial Pressure Circulation. The second circulation should be made with the kill mud weight in two steps: 1. Fill the drill string until the bit by keeping the pressure on the kill line constant and equal to SIDPP. 2. Complete circulation of the annulus to the surface keeping the pressure of circulation with the kill mud constant named FCP - Final Pressure Circulation.
Attention: about drill bit off bottom
This method should only be applied with the drill bit in the bottom hole or when the kick is completely in annullus of the column. To minimize errors of calculation of the kill mud weight, the calculations made in this application considers the depth of the drill bit instead of the depth of the well to calculate the kill mud weight. The formation pressure consider the depth of well. In case of top of the kick bellow the bit, it is recommended to apply the volumetric method until kick go through the drill bit to the annular, following then the driller's method.
Formulas:
ICP = Pks + SIDPP
ICP - Inital Circulation Pressure, psi
Pks - Recorded pump pressure at the kill rate speed, psi
SIDPP - Shut-in Drillpipe Pressure, psi
Notes about floating units:
a) Pks must be recorded by circulating riser;
b) Record the friction loss in the choke line at the kill rate speed, psi;KM = OM + SIDPP / (0.052 x TVD)
KM - Kill Mud Weight, ppg OM - Original Mud Weight, ppg TVD - True Vertical Depth, ft
FCP = Pks x KM / OM
FCP - Final Circulation Pressure, psi
Summary of method
| STEPS | PUMP PRESSURE | KILL PRESSURE | CHOKE PRESSURE | VOLUME TO PUMP |
|---|---|---|---|---|
| Bring the pump to kill speed | - | SICP | SICP - Choke line friction loss | - |
| Circulate out the influx to surface | ICP | - | - | Annulus Volume |
| Circulate to fill drill string with kill mud | - | SIDPP | SIDPP - Choke line friction loss | Drill string volume |
| Circulate to fill annulus with kill mud | FCP | - | - | Annulus Volume |
Screenshot from WCMethod:
Formulas used in calculations of this method:
Example in Well Control Simulator:
Drilling Hydraulics for iPhone, iPod touch and iPad on the iTunes, Apple Store
Drilling Hydraulics for iPhone, iPod touch and iPad
Description
The Drilling Hydraulics provides the driller, tool pushers, engineers, chemists, students and other professionals in the petroleum industry a productivity tool helpful in drilling of oil wells for hydraulics calculations, optimization of the penetration rate and can help on the decision on selection of bit nozzles.
The lite version is fully functional in a well pre-configured.
The full version is completely interactive and allows users to define a wide variety of parameters for oil wells.
Resources available:
1. Defining the parameters of the well, drill string, drill bit, mud (fluid), mud pumps, circulation lines on surface, diameter and coefficient of choke and more;
2. Options outstanding: Injecting into the drill string with the return flowline or by injecting the kill line to return the choke;
3. Options wells in floating units or in drilling land rigs;
4. Use of two mud pumps in parallel;
5. Choice of rheological models (Bingham and Power);
6. Calculations of the hydraulic drill bit and the system by friction;
7. Frictional losses in all sections, also showing the length, hydrostatic and Reynolds number in each section;
8. Calculation of the ECD on bottom hole and the casing shoe;
9. Hydrostatic calculations at the bottom hole and the casing shoe;
10. Calculation of bottoms up time;
11. Pressure x Flow chart with touchscreen and rotation (portrait / landscape) and scale definition;
12. Selecting the system of units;
13. Saves the data to reload later;
The lite version is fully functional in a well pre-configured.
The full version is completely interactive and allows users to define a wide variety of parameters for oil wells.
Resources available:
1. Defining the parameters of the well, drill string, drill bit, mud (fluid), mud pumps, circulation lines on surface, diameter and coefficient of choke and more;
2. Options outstanding: Injecting into the drill string with the return flowline or by injecting the kill line to return the choke;
3. Options wells in floating units or in drilling land rigs;
4. Use of two mud pumps in parallel;
5. Choice of rheological models (Bingham and Power);
6. Calculations of the hydraulic drill bit and the system by friction;
7. Frictional losses in all sections, also showing the length, hydrostatic and Reynolds number in each section;
8. Calculation of the ECD on bottom hole and the casing shoe;
9. Hydrostatic calculations at the bottom hole and the casing shoe;
10. Calculation of bottoms up time;
11. Pressure x Flow chart with touchscreen and rotation (portrait / landscape) and scale definition;
12. Selecting the system of units;
13. Saves the data to reload later;
Formulas used in rheological models:
Power-law Model: API Recommended Practice 13D – Rheology and hydraulics of oil-well drilling fluids, 2009-10-05
Bingham Model: IADC Drilling Manual, eBook Version (V.11), 2000
Sunday, November 28, 2010
Well Control Methods for iPhone, iPod Touch and iPad
Already available in the App Store an application that I developed for the study and application in the field of well control methods named "WCMethods.
The lite version is fully functional for a well pre-configured, allowing only change the parameters of the kick and the system of units.
The FULL version is now also available, which allows the user to configure the parameters of the well, drill string, bit, fluid, mud pump, beyond the parameters of the kick, the system of units and save data.
It is can be applied in the field of petroleum and also help in understanding the methods of well control.
This application uses the basic calculations of the methods to control oil wells after the occurrence of kick during drilling operations on floating platforms and land rigs.
Screenshots:
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