Oil & Gas Training
and Competency Development
Competency Management system SLB NEXT

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

Learning activity mix

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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