Operations and Wellsite Geology

Introduction

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

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

Geosteering

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

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

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