Rig Site Calculations For Drilling Operations

Quartz School for Well Site Supervisors 9. Rig Site Calculations for Drilling Operations Module – 9 Rig Site Calculations Section – 1 List of Parameters & Calculation Tools

C. Alvarez

Quartz School. Module 9: Rig Site Calculations / Section 1

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9. Rig Site Calculations for Drilling Operations 1. List of Calculations performed by the Rig Site Supervisor 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. C. Alvarez

Hoisting System Capacity Drawworks Horsepower Horse Power Requirements Hook load, Derrick Load Fast Line / Dead Line Tension Work done by the drilling line (Ton x mile) Slip & Cut drilling line program Surface Tanks capacity / volume Batch Tank & Trip Tank Calibration Mud pumps output & Performance Mud pumps efficiency Centrifugal pumps capacity & Performance Sizing of Accumulators Usable Volume Quartz School. Module 9: Rig Site Calculations / Section 1

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9. Rig Site Calculations for Drilling Operations 1. List of Calculations performed by the Rig Site Supervisor 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. C. Alvarez

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Mud / Gas Separator Design & Performance Solids Control Equipment Design & Performance Drill Pipe and Casing Tally preparation Drill Pipe Design: Max drilling depth based on MOP Drill Collar Length based on WOB and NP (vertical, directional well) Hook load (buoyed string) Drill String and Annulus Capacity & Volume Displacement of Drill String Components Trip Sheet Design and Calculations Drilling fluid system calculations: mixing, weighting up, dilution Drilling fluid properties: PV, YP, Gels, solids & liquid fractions, MBT, Chlorides, contaminants, etc. Quartz additives School. Module 9: Rig Site Calculations / Section 1 Liquid & Solid calculations

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9. Rig Site Calculations for Drilling Operations 1. List of Calculations performed by the Rig Site Supervisor 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. C. Alvarez

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Overbalance & Equivalent Mud Weight calculations Kick Tolerance calculation Batches & Pills design calculation Displacement and Spotting (positioning) of pills Circulating times, lag time, etc. Drilling Hydraulic calculations: Pressure Drop, ECD, HSI, JIF, TFA, etc. Lost of HP by POOH drill string without filling the well (wet & dry pipe) Swab & Surge Calculations & Maximum casing running speed Well Control calculations (Conventional & No Conventional) Free Point Estimation (using string stretch procedure) Primary Cementing calculations: Slurry volume, Additives (BW, BV) Balanced Quartz Cement Plug9: Rig calculations: Slurry, Spacers, School. Module Site Calculations / Section 1

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9. Rig Site Calculations for Drilling Operations 2. Units Systems Used in the Oilfield 1.

Oilfield Units

2.

Metric System

3.

Custom Units

4.

International System (SI)

5.

Imperial System (UK, Australia, Canada, etc.)

Conversion Factors Used to change value of units from one system to another Tables, Formulas, e-Converters C. Alvarez

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations

C. Alvarez

1.

Oilfield Handbooks – Technical data of drill string and equipment

2.

Excel Spread Sheets – For quick calculations (in put / out put)

3.

Formulas & Handheld calculator – Manual calculations

4.

Electronic Handbook – Provides data and calculations

5.

Proprietary Programs – Hydraulics / Engineering Software

6.

Drilling Handbook (electronic calculations) – WSS Toolbox

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations 1.

C. Alvarez

Oilfield Handbooks – Technical data of drill string and equipment 1.

Well Services – Field Data Handbook

2.

Baker – Techfacts Engineering Handbook

3.

IFP – Drilling Data Handbook

4.

Tenaris – Casing Data Handbook

5.

SLB Electronic Handbook

6.

API Specs and Recommended Practices Quartz School. Module 9: Rig Site Calculations / Section 1

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations 2.

C. Alvarez

Excel Spread Sheets – Quick calculations (input data / output results)

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations 3.

Formulas and Handheld Calculators

Not routinely used by the WSS. It is convenient to have a set of formulas for hand calculations in case of not having Excel sheets and computer software or as a mean to understand / verify electronic calculations

C. Alvarez

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations 4.

Electronic Handbook

Pipe and equipment data in electronic format which performs basic calculation of capacities, volumes, displacement, additives, etc. Example: Schlumberger “i – Handbook”

C. Alvarez

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations 5.

Proprietary Programs

Special Software developed by Service Companies, Training Organizations, and Operators to perform Engineering and Design and Drilling calculations Examples: Drilling Office, TDAS, CemCADE, Hydraulics Program from Mud and Drill Bits companies, Drilling Schools, etc.

C. Alvarez

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9. Rig Site Calculations for Drilling Operations 3. Tools and Resources for Rig Site Calculations 6.

Drilling Handbook

Well Site Supervisor Toolkit for performing most common calculations for Drilling Operations using a collection of electronic calculators Example: Schlumberger Rig Management Calculator

C. Alvarez

Quartz School. Module 9: Rig Site Calculations / Section 1

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9. Rig Site Calculations for Drilling Operations 4. General Guidelines for Rig Site Calculations 1. 2. 3. 4. 5. 6. 7.

C. Alvarez

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Know detailed specifications for all drill string components and accessories Have available technical specs for rig systems and equipment Have available Handbooks to help in the identification of specs and properties Have available technical manual, operating parameters and specs for all equipment and special tools from service Companies Have available all Standard Procedures and Recommended Drilling Practices Follow the procedures and parameters included in the Drilling Program Check / Verify basic design and calculations included in the Drilling Program Verify the validity of the Excel spread sheets in use by performing Quartz School. Module 9: Rig Site Calculations / Section 1

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9. Rig Site Calculations for Drilling Operations Drilling the Well •

Review the Drilling Program and Drilling Parameters

•

Well Data and information • • • • • •

C. Alvarez

Surface and Target Coordinates Well Trajectory Drilling String Drilling Hydraulics Mud Data Cementing Program

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9. Rig Site Calculations for Drilling Operations Type S Well 17 1/2” Hole Section @ 700 m TVD / MD Casing: 13 3/8”, 54.5 lb/ft, J-55, BCN @ 700 m 12 1/4” Hole Section @ 2,240 m TVD / 2,336 m MD Casing: 9 5/8”, 36 lb/ft, P110, BCN

Well Data: Loc: Quartz N° 1 Objective Sands: W-1, W1, W-3, W-4 Class: Development Surface Coordinates: : X: 494,705.20 m : Y: 2,884,398.16 m Target Coordinates: X: 494,554.00 m Y: 2,884,115.00 m Directional Plan:

@ 0 –2,336 m 8 1/2” Hole Section @ 2,528 m TVD / 2,656 m MD Casing: 7”, 29 lb/ft, , P110, BCN @ 0 –2,656 m 6 1/8” Hole Section @ 3,100 m TVD / 3,227 m MD Casing: 3 ½”, 9.3 lb/ft, P110, PREMIUM @ 0 – 3,227 m Events: Total Losses @:

2100 m with MW = 1.38 gr/cc MW cut to 1.33

gr/cc Partial Losses @ 2100 - 2150 m. Kick @ 2307 m. Valve)

SIDPP = 100 (Float SICP = 300 psi

C. AlvarezPit Gain : 7 barrels

Mud Program @ TVD (m): 17 2” Hole Section: Interval: 0 – 700 m, WBM: 1.15 – 1.30 gr/cc 12 ¼” Hole Section: Interval: 700 – 2336 m, WBM: 1.30 – 1.50 gr/cc 8 ½” Hole Section: Interval 2336 – 2656 m, EI: 1.50 – 2.00 gr/cc 6 1/8” Hole Section:: Interval 2656 – 3227 m, EI: 2.00 – 2.17 gr/cc Reservoir Data: Pore Pressure: 3000 psi @ 2240 m, 3600 psi @ 2304 m Temperature:

4900 psi @ 2454 m, 6400 psi @ 2595 m 150° C

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