Introduction to Formation Evaluation Abiodun Matthew Amao
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1 Introduction to Formation Evaluation By Abiodun Matthew Amao Monday, September 09, 2013 Well Logging PGE 492 1
2 Lecture Outline What is formation evaluation? Why do we evaluate formation? What do we evaluate? What data are we interested in? Who needs these data? What tools and methodology? Summary References Monday, September 09, 2013 Well Logging PGE 492 2
3 What is formation evaluation? Formation evaluation is the application of scientific principles, engineering concepts and technological innovations in the exploration and prospecting of hydrocarbon resources in geological formations in an environmentally sustainable and responsible manner. It involves detailed and systematic data acquisition, gathering, analysis and interpretation both qualitatively and quantitatively while applying scientific and engineering principles. It is an ever growing and evolving field of petroleum engineering Petrophysicists are engineers or geologists that specialize in the profession of formation evaluation. Monday, September 09, 2013 Well Logging PGE 492 3
4 Why do we evaluate formation? We want answers to the following questions: Is there any oil or gas there? Where are they located? How much of it? How much can we produce, which answers the question, How much money can we make? Monday, September 09, 2013 Well Logging PGE 492 4
5 What do we evaluate? We evaluate a reservoir; a reservoir is the container storing the hydrocarbon. A conventional reservoir will be characterized by the following properties; Trap/Cap Rock Source Rock Porous and Permeable media Hydrocarbons (Gas or Oil) Monday, September 09, 2013 Well Logging PGE 492 5
6 What data are we interested in? Rock Type Porosity Fluid Saturation (Volumes) Fluid Type Reservoir Structure Permeability (Ease of fluid flow within porous media) Reservoir Pressure (Drive) Monday, September 09, 2013 Well Logging PGE 492 6
7 Scale in Formation Evaluation Order of Magnitude (Meters) Formation Evaluation Technique 10 6 Satellite Imagery 10 5 Basin Geologic Studies 10 4 Seismic, gravity, magnetics 10 3 Borehole gravimeter, Ultra long spacing electric logs Purpose Gross Structure Local Structure 10 2 Drill Stem Tests Productivity and Reserves 10 1 Wireline Formation tests 10 0 Full diameter cores (Whole Core) Local Porosity, permeability 10-1 Sidewall cores, LWD, Wireline and Lithology 10-2 Core-plug analysis, micro-logs 10-3 Cutting analysis, mud logging Local Hydrocarbon Content 10-4 Core analysis Rock Properties 10-5 X-ray mineralogy Rock and clay typing 10-6 Scanning Electron Microscope Micro-structure 7
8 Who Needs What Data? Discipline Geophysicist Geologist Reservoir Engineer Drilling Engineer Data Time-Depth relationship for seismic profile Stratigraphy, Structural Sedimentary features, Mineralogy, bedding planes Porosity, permeability, fluid contacts, reservoir pressure, producibility Reservoir targets, offset log data if any Production Engineer Manager Government (Regulator) Rock mechanical properties, reservoir pressures, flow potential, flow assurance issues, fluid types Hydrocarbon in place, recoverability, cost of development, profitability Keeps a record of All data, field development plan (FDP), Profitability for the national economy Monday, September 09, 2013 Well Logging PGE 492 8
9 What tools and methodology? Seismic Survey Well Testing (PTA) Mud Logging Formation Fluid Sampling Formation Evaluation MWD/LWD Coring and Core Analysis Wireline Logging Monday, September 09, 2013 Well Logging PGE 492 9
10 Data from Seismic Survey Vertical Seismic profile of the earth Structure of reservoir Location of traps and seals Depth of structure and geologic layer Presence of fluids 3D high resolution surveys Time Lapse seismic (4D Seismic) Monday, September 09, 2013 Well Logging PGE
11 Seismic surveys Monday, September 09, 2013 Well Logging PGE
12 Data from Mud Logging Mud logging: Analyzing, evaluating and monitoring drill cuttings and circulating mud during the drilling process. Data we can get include; Lithology, mineralogy and their estimated depths Hydrocarbon shows and type Chromatographic analysis of gas Hazardous gas e.g. H 2 S Rate of penetration Fossil record Overpressure zones Drill cutting porosity Monday, September 09, 2013 Well Logging PGE
13 Mud Logging Units Mud Log Monday, September 09, 2013 Well Logging PGE
14 Data From MWD/LWD Measurement While Drilling (MWD) and Logging While Drilling (LWD) : These describes continuous measurement taken by down-hole sensors during drilling. The tools (subs) are made up with the BHA (bore hole assembly) drill string. It is an indirect measurement. Data gotten; Porosity, Lithology Acoustic Formation Pressure and Temperature Resistivity Nuclear Magnetic Resonance (NMR) Hole deviation from vertical, azimuth from geographic coord. Tool face angle, ROP etc. Gamma Ray Monday, September 09, 2013 Well Logging PGE
15 MWD/LWD Tools Monday, September 09, 2013 Well Logging PGE
16 Data from Wireline Logging Most versatile of the formation evaluation methods, it is an indirect measurement; we can get the following data; Open Hole Logging Porosity Fluid Sample (Types) Water Saturation Hydrocarbon movability Lithology Formation dip and structure Sedimentary Environment Travel times of elastic waves Permeability Fracture and Vugs Rock mechanical properties Cased Hole Logging Flow rates Fluid types Pressure Residual oil saturation Cement evaluation (Bonding) Monday, September 09, 2013 Well Logging PGE
17 Truck, Skid, Tools and Cable Monday, September 09, 2013 Well Logging PGE
18 Data from Core Analysis Coring: Get unaltered formation sample, bring it to the surface with its native fluid, preserve both and transport to a laboratory for detailed analysis. Conventional Coring- Used of core bit and BHA Wireline Cores: Sidewall core guns and Rotary sidewall coring tool Data gotten from cores are; (These are direct measurements done on the core samples) Routine core analysis: Porosity, Permeability, Lithology, grain density, Fluid saturation etc. Special core analysis: Relative permeability, pore-size distribution, mineralogy, SEM, CT-Scan, Electrical properties, mechanical properties, Capillary pressure, etc. Monday, September 09, 2013 Well Logging PGE
19 Tools for Coring on Different Scale Sidewall Core Guns Core bits Monday, September 09, 2013 Well Logging PGE
20 Data from Fluid Sampling Reservoir fluid is sampled using the following methodology; Drill stem testing (DST) or Production Tests Wireline formation testers LWD Formation Testers Surface Samples at the wellhead or separator Data acquired include; Fluid Type, PVT data, Fluid Composition from Lab tests Pressure and temperature Viscosity, GOR, API Asphaltene and wax content Presence of H 2 S Monday, September 09, 2013 Well Logging PGE
21 Formation Tester Telemetry Hydraulics Electronics Packer Drawdown / Pump Large Volume Pump Tank Carrier Borehole Exit V.P.C. Extraction manifold Tank Tank
22 Well Testing (Pressure Transient Analysis) Pressure Transient Analysis (PTA), is the recording of variation of pressure with time through a wellbore in a reservoir after a disturbance (shut-in, open to flow etc.) to normal well operations. It is also called; Well Testing Flow Tests Well testing is possible because pressure and flow rate can easily be measured in a well and an analysis of the measurement history reflects reservoir parameters. Pressure measurement can be; Static (one time measurement) Last the Duration of a Well test Continuous e.g. Downhole pressure gauges in wells Monday, September 09, 2013 Well Logging PGE
23 Reservoir Properties Obtainable from Various Tests Well Test Drill Stem Tests Drawdown Tests Buildup Tests Step-rate Tests Falloff Tests Interference and Pulse Test Layered Reservoir Tests Multiple Formation Testers Reservoir Properties Obtainable Reservoir Behavior, Skin, Permeability, Fracture Length, Reservoir pressure, reservoir limit, boundaries Reservoir Behavior, Skin, Permeability, Fracture Length, reservoir limit, boundaries. Reservoir Behavior, Skin, Permeability, Fracture Length, Reservoir pressure, boundaries Formation parting pressure, Permeability, Skin Mobility in various banks, Skin, Reservoir pressure, Fracture length, Location of fronts, boundaries. Communication between wells, Reservoir behavior, porosity, Interwell permeability, vertical permeability Properties of individual layers, Horizontal K, Vertical K, Skin, Average layer pressure, outer boundaries Pressure profile Monday, September 09, 2013 Well Test Analysis PGE
24 Typical Well Test Monday, September 09, 2013 Well Logging PGE
25 Summary Lots of evaluation tools are available in petroleum engineering, engineers have to be aware of these tools, the data and the scale of the acquired data, relative to the reservoir. It is best to integrate all available data when analyzing Petrophysical data; the whole picture must be consistent. Different companies have different names for their proprietary tool, but tool s scientific principles are the same. Monday, September 09, 2013 Well Logging PGE
26 References Richard Bateman, Open-hole Log Analysis and Formation Evaluation, IHRDC Publishers New York Crombe et. Al., Innovations in Fluid Sampling, Schlumberger Oilfield Review, Autumn Baker Atlas Training Manual, Montrose Training Center, Montrose Scotland, Monday, September 09, 2013 Well Logging PGE
27 Introduction to Formation Evaluation By Abiodun Matthew Amao Monday, September 09, 2013 Well Logging PGE
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