Download Wellsite Geology Manual - OMV PDF

TitleWellsite Geology Manual - OMV
File Size565.6 KB
Total Pages102
Table of Contents
                            1 PREAMBLE
	1.1 DUTIES AND RESPONSIBILITIES OF THE WELLSITE GEOLOGIST
	1.2 REPORTING FROM WELLSITE
	1.3 SAMPLE DESCRIPTION
		1.3.1 Introduction
		1.3.2 Cuttings Description
			1.3.2.1 Show Evaluation
	1.4 MUDLOGGING SUPERVISION
	1.5 CORING
	1.6 WIRELINE LOGGING
		1.6.1 General Requirements
	1.7 PRODUCTION TESTING/DRILL STEM TESTING
	1.8 LIAISON WITH WELLSITE MANAGER (DRILLING SUPERVISOR)
	1.9 DATA DISTRIBUTION
	1.10 CONFIDENTIALITY
	1.11 DATA COMPILATIONS
	1.12 WELLSITE SUPPLIES
2 REPORTING PROCEDURES
	2.1 INTRODUCTION
		2.1.1 Routine Daily Reporting
	2.2 MORNING AND AFTERNOON DAILY REPORTS
		2.2.1 Discussion
		2.2.2 Remarks
	2.3 DAILY REPORTING
		2.3.1 Abbreviations
		2.3.2 Description Format for Daily Reports
		2.3.3 Other Reports
		2.3.4 Contractor Reports and Data
3 SAMPLE DESCRIPTION
	3.1 INTRODUCTION
	3.2 DISCUSSION OF ELEMENTS COMPRISING A LITHOLOGICAL DESCRIPTION
		3.2.1 Sample Quality
		3.2.2 Rock Type
			3.2.2.1 Siliciclastic
			3.2.2.2 Transitional
			3.2.2.3 Carbonates
			3.2.2.4 Evaporites
		3.2.3 Colour
		3.2.4 Hardness
		3.2.5 Fracture
		3.2.6 Texture
		3.2.7 Grain size
		3.2.8 Rounding
		3.2.9 Sorting
		3.2.10 Sphericity
		3.2.11 Cement
		3.2.12 Fossils and Accessories
		3.2.13 Visual Effective Porosity
		3.2.14 Hydrocarbon Indications
4 SHOW EVALUATION
	4.1 INTRODUCTION:
	4.2 REPORTING OF SHOWS:
	4.3 SHOW EVALUATION FORM
	4.4 MUD GAS SHOWS
		4.4.1 Total Gas Readings
		4.4.2 Gas Chromatograph
		4.4.3 Integration with Shows from Cuttings
	4.5 ROUTINE HYDROCARBON DETECTION METHODS FOR CUTTINGS
		4.5.1 Staining and Bleeding
		4.5.2 Odour
		4.5.3 Sample Fluorescence
		4.5.4 Hydrocarbon (Solvent) Cut
		4.5.5 Solvent Cut and Residue Fluorescence
	4.6 OTHER HYDROCARBON DETECTION METHODS FOR CUTTINGS
		4.6.1 Wettability
		4.6.2 Reaction in Acid of Oil Bearing Rock Fragments
		4.6.3 Acetone-Water Test
		4.6.4 Hot-Water Test
		4.6.5 Iridescence
	4.7 GENERALISATIONS
5 DRILLING BREAKS, CORING AND SIDEWALL CORING
	5.1 DRILLING BREAKS
	5.2 CORING
		5.2.1 Items Required
		5.2.2 General Procedures
		5.2.3 Core Handling
		5.2.4 Core cleaning, marking and cutting
		5.2.5 Core Shipping
		5.2.6 Descriptions
		5.2.7 Core Analysis
	5.3 SIDEWALL CORING
		5.3.1 Programme
		5.3.2 Percussion Sidewall Core Operations
		5.3.3 Percussion Sidewall Core Descriptions
		5.3.4 Rotary Sidewall Core Operations
		5.3.5 Rotary Sidewall Core Descriptions
		5.3.6 Core Labelling, Packaging and Transportation
6  MUDLOGGING NOTES
	6.1 INTRODUCTION
	6.2 LAG TIME
		6.2.1 Determination of Lag Time (Theoretical)
		6.2.2 Determination of Lag Time (Carbide)
	6.3 TOTAL GAS DETECTOR
	6.4 GAS CHROMATOGRAPH
	6.5 DRILL RATE
	6.6 PIT LEVELS
		6.6.1 Drop in Pit Levels
		6.6.2 Rise in Pit Levels
	6.7 OTHER COMMON EQUIPMENT
	6.8 SAMPLING PROCEDURES (CUTTINGS)
	6.9 EVALUATION OF MUDLOG SHOWS
		6.9.1 Factors Affecting Gas Shows
	6.10 FALSE HYDROCARBON SHOWS
		6.10.1 Gas
			6.10.1.1 Connection Gas
			6.10.1.2 Trip Gas
			6.10.1.3 Recirculated Gas
		6.10.2 Oil
	6.11 PROBLEMS IN INTERPRETING CUTTINGS
		6.11.1 Contamination from Previously Penetrated Beds
			6.11.1.1 Cavings
			6.11.1.2 Recirculation
		6.11.2 Other Contaminants
			6.11.2.1 Lost Circulation Material
			6.11.2.2 Cement
			6.11.2.3 Drilling Mud
			6.11.2.4 Oil Contamination, Pipe Dope, etc.
			6.11.2.5 Pipe Scale and Bit Shavings
	6.12 MISCELLANEOUS INTERPRETATION PROBLEMS
		6.12.1 Rock Dust
		6.12.2 Rock Flour
		6.12.3 Powdering
		6.12.4 Fusing
		6.12.5 Spread
7 GEOCHEMICAL SAMPLING
	7.1 INTRODUCTION
	7.2 CANNED CUTTINGS SAMPLES
	7.3 MUD SAMPLES
	7.4 SIDEWALL CORES (SWC)
	7.5 CORE CHIPS
8 GEOPRESSURES
	8.1 ORIGIN OF ABNORMAL PRESSURES
		8.1.1 Aquifer
		8.1.2 Charged Shallow Sands
		8.1.3 Tectonic Movement
		8.1.4 Compaction
		8.1.5 Diagenesis
		8.1.6 Thermal Expansion
	8.2 DETECTION OF GEOPRESSURES DURING DRILLING
		8.2.1 Kick
		8.2.2 Presence of Contaminating Formation Fluids
		8.2.3 Increase in Background and Connection Gas
		8.2.4 Abnormal Trip Fill-Up Behaviour
		8.2.5 Change in Size and Shape of Shale Cuttings
		8.2.6 Increase in Fill on Bottom
		8.2.7 Increase in Drag and Torque
		8.2.8 Increase in Penetration Rate in Shale
		8.2.9 Decreases in Shale Bulk Density Trend
		8.2.10 Shale Factor
		8.2.11 Increase in Flowline Temperature
		8.2.12 Decrease in d-Exponent Trend
		8.2.13 Fracture Pressure Gradient Determinations
	8.3 PRESSURE DETECTION AFTER DRILLING
9 REPORTING FORMS
	9.1 WELLSITE GEOLOGIST'S CHECKLIST
	9.2  DAILY GEOLOGICAL REPORT
	9.3 CORE CHIP DESCRIPTION FORM
	9.4 PERCUSSION SIDEWALL CORE DESCRIPTION
	9.5 ROTARY SIDEWALL CORE  DESCRIPTION
	9.6 HYDROCARBON SHOW EVALUATION FORM
	9.7 WIRELINE LOGGING QUALITY CONTROL (with Diary and Horner Plot)
	9.8 MUDLOGGING QUALITY CONTROL CHECK LIST
APPENDICES
1 Interpretation of Mud Gas Ratio Data
2 Roundness and Sphericity, Percentage Estimation
3 Wellsite Geologist Supplies Inventory
4 Conventional Coring
	4.1 General
	4.2 Coring Equipment
		4.2.1 Outer Barrel
		4.2.2 Inner Barrel
		4.2.3 Swivel Assembly
		4.2.4 Catcher Assembly
		4.2.5 Safety Joint
		4.2.6 Stabilisers
		4.2.7 Core Bits
	4.3 SPECIAL CORING SYSTEMS
		4.3.1 General
		4.3.2 Pressure Retained Coring
		4.3.3 Sponge-Lined Coring System
		4.3.4 Full-Closure Coring Systems
		4.3.5 Rubber Sleeve Core Barrel
		4.3.6 Wireline Retrievable Core Barrel
		4.3.7 Oriented Coring
	4.4 CORING BITS
		4.4.1 General Guidelines
		4.4.2 Thermally Stable Diamond - TSP
		4.4.3 Polycrystalline Diamond Compact - PDC
		4.4.4 Roller Cone
		4.4.5 Fluid Discharge Characteristics of Core Bits
			4.4.5.1 Throat Discharge
			4.4.5.2 Low-Invasion Profile
5 DRILLING FLUID ENGINEERING
	5.1 INTRODUCTION
	5.2 HISTORY
	5.3 FUNCTIONS OF A DRILLING FLUID
	5.4 DRILLING FLUID PROPERTIES
		5.4.1 Sample
		5.4.2 Time Sample Taken
		5.4.3 Flowline Temperature
		5.4.4 Depth
		5.4.5 Weight
		5.4.6 Funnel Viscosity
		5.4.7 Plastic Viscosity and Yield Point
		5.4.8 Gel Strengths
		5.4.9 Filtrate
		5.4.10 API HPHT Filtrate
		5.4.11 Cake Thickness
		5.4.12 Solids Content
		5.4.13 Sand Content
		5.4.14 Methylene Blue Capacity
		5.4.15 pH
		5.4.16 Alkalinity (Pm Pf Mf)
		5.4.17 Chloride
		5.4.18 Total Hardness
		5.4.19 Additional Testing
	5.5 DRILLING FLUID ADDITIVES
		5.5.1 Fluid Loss Control Additives
			5.5.1.1 Clays
			5.5.1.2 Starch
		5.5.2 Polymers
			5.5.2.1 Sodium Carboxyl-Methyl Cellulose (CMC)
			5.5.2.2 Polyanionic Cellulose
			5.5.2.3 Chemical Thinners/Dispersants
			5.5.2.4 Viscosifiers
	5.6 DRILLING FLUID SYSTEMS
		5.6.1 Water-Based Systems
		5.6.2 Oil-Based Systems
		5.6.3 System Summary
	5.7 NEW DRILLING FLUID SYSTEMS
		5.7.1 Synthetic Systems (Novadril)
		5.7.2 Oligomers do not contain toxic hydrocarbons.
		5.7.3 Envirotherm
		5.7.4 A Cationic Water-Based Mud System
		5.7.5 Causes of Shale Inhibition
		5.7.6 Inhibition
6 Abbreviations
                        

Similer Documents