• Class and Course

    Operations and Wellsite Geology

    This course provides a complete overview of wellsite operations from the perspective of the Operations Geologist and the Wellsite Geologist. The focus is on being able to understand the job functions that are typically performed at the wellsite, and what use is made of the large amounts of data collected. The course will also provide an overview of essential drilling operations that have a direct bearing on these discliplines.

    Wellsite geologists study rock cuttings from oil and gas wells to determine what rock formations are being drilled into and how drilling should proceed. They identify critical strata from core samples and rock-cutting data and build up knowledge of the structure being drilled. They are experienced geologists, deciding when specialized tests should be carried out and, ultimately, when to stop drilling. They send reports and logs of completed drilling to the operations geologist and offer geological advice to oil company representatives. They also incorporate health and safety requirements in daily geological operations. Wellsite geologists also liaise with drilling engineers, petroleum engineers and mudloggers during the course of projects.

    Participants will learn the techniques used by wellsite geologists in formation evaluation through a combination of lectures and exercises that can typically be done at the wellsite. At the end of the course, the participants should have a good understanding and knowledge of the requirements of both Operations and Wellsite Geology.

    The course will blend classroom instruction with several practical exercise sessions. If location permits, a visit to a wellsite can be arranged.

    Day 1


    What is an Operations and Wellsite Geologist?

    Exploration and Drilling Programs – Risk assessment, regional analysis, pre-drill data acquisition.

    Components of a prospect

    Overview of Petroleum Geology

    The Petroleum system – elements & processes

    The Reservoir – Sedimentary Environments

    The Trap – Structure & Stratigraphy

    Mapping and Cross-Sections

    Pore Systems and Flow Units

    Reserves and Resources – classification and categories

    Data Types and Management

    Wireline Data – open and cased hole, testing, LWD and MWD

    Mud Logging Data – geological, drilling, pressure

    Core Data – whole core and sidewall core

    Day 2

    Drilling Operations

    The drilling team – who does what?

    Types of Drilling rigs

    Rig Sub-systems – power, hoisting, rotary, circulating, well control

    Drilling tools and components – including drilling fluid

    Well control – kicks causes – basic calculations – safety equipment – kill methods

    Well costs

    Planning a Well

    Well Design

    Directional Drilling – methods and calculations


    Day 3

    Mud Logging

    The Logging unit – components and functions

    Services – monitoring, sampling, analysis

    Cuttings analysis and description

    The mud log

    Safety considerations – monitoring, overpressure, downtime

    Gas detection and analysis – types of gas – gas shows – equipment and methods

    Coring and Core Analysis

    Coring methods and equipment

    Whole Core and Sidewall Core

    Core handling and preservation

    Basic calculations – core-log integration

    Day 4

    Pore Pressure and Wellbore Stability

    Overburden and compaction

    Pore pressure generation – estimation – normal and abnormal pressure

    Detection from Seismic – pre-drill prediction

    Stress and Strain – wellbore failure – lost circulation

    Sampling – types and preservation

    Quality control of acquired wellsite data

    Wellsite Geologist Responsibilities

    Wireline Logging Tools and Measurements

    Review of basic logging tools for lithology, porosity, saturation

    Resistivity and Invasion

    Day 5

    Wireline Log Interpretation

    Basic concepts – quicklook workflow

    Determination of lithology

    Shale – calculation of shale volume - effects and corrections

    Determination of porosity

    Determination of water saturation – resistivity effects – formation water

    Analysis techniques - crossplots

    Cased Hole Logging

    Production Monitoring and Reservoir Performance

    Cement Bold Log Evaluation

    Borehole Imaging

    Dipmeter Principles

    Dipmeter Interpretation

    E&P staff who want to learn the functions that are performed by Geologists at the wellsite.

    Petroleum geology overview

    Drilling operations

    Mud logging

    Pore pressure

    Wellbore stability

    Wellsite geologist responsibilities

    Coring and core analysis

    Wireline logging - tools & measurements

    Wellsite wireline log interpretation

    Cased Hole Logging

    Dipmeter Interpretation

    Basic knowledge of Geoscience is suggested but not essential.

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