GSTT Wellsite Operations Geology Outline

8/9/2019 GSTT Wellsite Operations Geology Outline

1/10

www.kronusgsl.com www.thegstt.com

1

Operations & Wellsite Geology Short Course:

A large amount of geological data is acquired at substantial cost during a drilling operation. Ensuring

optimal quality of this data and its effective reporting plays a key role during well design and drilling

operations, and later use of this data in field studies.

A key requirement for success is close cooperation between geological, drilling and engineering

functions. This course provides a thorough overview of wellsite data acquisition and quality control.

Participants will learn the techniques used by Wellsite Geologists, Logging Geologists (mudloggers) and

Operations Geologists functions through interactive lectures that are integrated with practical exercises.

Participants will also gain anunderstanding of the application of wellsite data in exploration and

development.

Date:21st-24thJuly, 2014

Duration: 4 days

Cost: $2200US; Students (Undergraduate Special Price): $1000US

Venue:UWI Petroleum Geosciences Unit, St Augustine Campus

Target Group: Entry level and Junior (1-3 years experience) Geoscientists working in oil and gas

companies, service companies and the MEEA. The course is designed for persons slightly familiar withthe basics of hydrocarbon exploration and development who want to improve their understanding of

wellsite geological operations and teaches the fundamentals elements of mudlogging, wellsite geology

and operations geology. It will give the participants valuable insight into the process of wellsite data

acquisition, the value of the data and also its limitations. The course assumes a basic knowledge of rigs,

drilling activities and the personnel involved in these activities.

Course Level:Basic

Instructors:Mr. Bruce Greenidge (Operations Geology)

Mr. Horace Tuitt (Wellsite Geology)

Mr. Neil Mohammed (Mudlogging)


2/10


3/10


3

Horace Tuitt

Horace is the Principal of Tuitt Services, a service provider and has thirty-four (34) years oilfield

experience the majority of which was spent as a Consultant Wellsite Geologist in the mid 90s two (2)

years were spent as a Logging Geologist with Baker Hughes Inteq.

He began his career with Texaco as a Field Geologist in 1978 working in Barrackpore and Oropouche and

later as a Wellsite Geologist in the ECMA (Dolphin Field) and the Gulf of Paria until 1981. From 1981-

1990, Horace worked with Amoco Trinidad Oil Company as a Geologist in the Poui Field development

and Samaan Field structural study. His wellsite geology career began in earnest in 1993 with ATOC and

continued with Halliburton Trinidad Limited on ATOCs Immortelle, Mahogany, Teak and Samaan Fields.

His responsibilities included but not limited to: well planning, preparation of montages and geologicaloperations plans, geological guidance and updates to Subsurface Team, LWD and EWL data QC,

hydrocarbon evaluation, coring operations supervision, regular communications with the MEEA End of

Well Reports creation and training of service personnel in mudlogging and wellsite geology.

In 2001, Horace began consulting as a Wellsite Geologist with Hydrocarbon Outsource Limited on

BGT&Ts Hibiscus, Chaconia and Ixora Fields Development in the NCMA 1. He later consulted for

Professional Petroleum Services for clients such as BHP Billiton, EOG Resources Trinidad Limited, Kerr

McGee/Anadarko Trinidad Limited and Petro-Canada Trinidad Inc. He consulted for Kronus Geological

Services Limited on projects for Niko Resources Trinidad Limited, Parex Resources (Trinidad) Limited,

Bayfield Energy (Trinidad) Limited, EOG Resources Trinidad Limited, Centrica Energy Upstream, Trinity

E&P LLC, BGT&T and Repsol E&P Trinidad Limited.

Horace has participated in numerous industry training courses over the years including the following

seminars: NGT/ LDT Interpretation, Borehole Seismic Interpretation, Schlumberger

Advanced Interpretation, Dipmeter Interpretation, Wireline Logging, Sandstone Reservoirs, Recent

Sedimentation Clastic and Field Trip, Evaluation of Drilling and Testing Data, Well Log Interpretation

Review, Geophysics for Non- Geophysicists, Schlumberger Basic Log Interpretation. He also attended the

following GSTT Schools: Development Geology, Seismic Stratigraphy, Structural Geology, Turbidite

Geology and the AAPG Petroleum Exploration School.

His tertiary education consists of an A.S. in Architectural Engineering from Essex County College,

Newark, N.J. and a BS in Geology from the University of Florida, Gainsville, Florida. Since then he has

participated in numerous industry training courses over the period 1978 -1989. He is a member of the

GSTT.


4/10


4

Neil Mohammed

In 2006 Neil began his oilfield career as a Field Geologist with Latinum Limited performing surface

geological mapping of the South Western peninsula for Trinidad Exploration and Development Ltd.

On completion of this project, Neil began working as a Logging Geologist with International Logging Inc

(now Weatherford International SLS) for the next seven (7) years. During this time he rose to the

position of Senior Data Engineer/Unit Manager. His mudlogging experience involved work in most

geological basins both onshore and offshore locally with Trinmar Limited (Soldado East, West and Main

Fields), BGT&T (NCMA and Dolphin Field, ECMA, Central Block), EOG Resources (Block U(b), Anadarko,

Petro-Canada ( Block 1A/1B, Gulf of Paria and Block 22), TED and Canadian Superior (Block 5C).

Internationally, Neil worked in the Campos Basin, Brazil with Petrobras, Devon Energy, Hess, Anadarko,Maersk, Statoil, ONGC and Karoon Petroleo & Gas Ltd. His primary responsibilities included well

monitoring via drilling engineering, drilling fluids engineering, description of drilled cuttings, preparation

of daily reports and logs, crew supervision and training of new hires, equipment maintenance and the

preparation of Geological End of Well Reports (EOWRs).

In 2013, Neil began geological consulting as Junior Wellsite Geologist with Kronus Geological Services

Limited on projects for Centrica Energy Upstream (Block 22 and NCMA 4), BGT&T Limited (Block E/5a),

Trinity E&P LLC (Galeota Block). He currently consults as a Wellsite Geologist on the Leni Gas and

Oil/Goudron E&P Trinidad Limited project in the Goudron Field, Guayaguayare.

Neil pursued his BSc (Geology) at the UWI, Mona, Jamaica.


5/10


5

What You Will Learn:

Understanding of fundamental mudlogging, Wellsite geology and operations geology concepts

The roles of the Logging, Wellsite and Operations geologists

The importance of good communication between all players in

To understand how wellsite derived data is obtained

Who are the main geological/formation evaluation contractors and their responsibilities

How to choose and quality control the geological/Formation Evaluation contractors

How to evaluate formation pore pressures using wellsite derived data

How to pick core and sidewall core points (and how to process them effectively)

How to competently plan the geological aspects of a well including well and data acquisition programmes

How to ensure good, consistent cuttings and show descriptions

Wellsite log and report preparation

How to effectively manage wellsite derived data

How to handle final well documentation


6/10


6

General Outline:

Review of some fundamental concepts: mudlogging, wellsite geology and operations geology

Wellsite Health Safety and Environment - roles of WSG, DE/ML

Mudlogging roles and responsibilities

Drill cuttings Sample management

Well Logs: FEL, Pressure Log, Time Log, DDL, Gas Ratio

Gas Analysis: Chromatography, Wetness Ratio

Data Engineering: DXc, sensors

Documentation: EOWR

Wellsite geologist roles and responsibilities

Sample and Show description: cuttings and cores

The basics of formation pore, fracture and overburden pressures

Formation Pressure Evaluation techniques at the Wellsite

HTHP wells from a geological perspective

Core point picking

Operations geologist roles and responsibilities

Well data management

Geological contracts, contractor evaluation and quality control

Coring programmes: RCAL and SCAL

Logs: selection, quality analysis, LWD, EWL, Lithology determination, facies and depositionalenvironment analysis, fracture detection

Documentation: Geological Engineering Programme, Operations Geology Manual, Final Geology Report


7/10


7

INTRODUCTION TO MUDLOGGING

Logging Geologist Duties:

Role and Function of Mudloggers: job qualification requirements and career paths

The Mud Circulating System: Pumps, Pits, Mixing Hopper, Standpipe, Rotary Hose

Drilling Fluids: Functions, Controlling Subsurface Pressures, Pressure control terminology, Pore Pressure

Types of Drilling Fluids: Water-based, Oil-Based

Calculation of Lag Time: Theoretical and Actual Lag (using carbide and tracers)

Depth and ROP Determination: Depth Sensors

Gas Sampling, Determination and Evaluation: Gas Trap, THA, FID Chromatography

Gas Show Determination and Analysis: Sources of gas in mud, Gas Types, factors influencing gas

readings

Oil Show Determination and Analysis

Other Mudlogging equipment: Microscope, UV Box, Pit Level indicators, Sensors - Pump Stroke, MudProperties, Rig Floor

Samples and Sample Preparation: Collection and Preparation, Sample Types

Examination and Interpretation of Cuttings


8/10


8

INTRODUCTION TO WELLSITE GEOLOGY

Wellsite Geologist Duties:

Project evaluation and understanding: Geological documentation familiarity -

Engineering Programme, Operations Manual

Structural Objectives

Directional Objectives

Sample Evaluation Objectives

Communication Objectives

Data Acquisition Objectives

Data Distribution Objectives

Quality Control Objectives

[Observation of Well Data while Drilling]

Pore Pressure Evaluation

Coring Criteria: Core point selection, Decision Tree, Risk Assessment

Casing Point Pick Criteria

Stuck Pipe Mechanism

IMPORTANTInteraction with:

Operations Geologist

Company Man/Drilling Engineer

Geological and Drilling Engineering Service Providers:

Mud Logging

MWD/LWD/ Directional

Electric Wireline LoggingPore Pressure Analysis

Biostratigraphy

Drilling Fluids Engineering

Ensuring that geological and drilling objectives are realized


9/10


9

INTRODUCTION TO OPERATIONS GEOLOGY

Operations Geologist Duties:

To provide geological support to multi-disciplinary team - Subsurface, Drilling Engineering, Rig

Responsible, along with shore-based multidisciplinary team (Subsurface and Drilling) for the

geological planning and execution of wells

Areas of work include:

Review of offset wells to determine data acquired, subsurface risks/problems encountered/NPT.

Establish data acquisition plan and services (LWD/wireline/mudlogging/biostratigraphy/Pore

Pressure Analysis) to be utilized.

Determine all potential subsurface risks and mitigations

Coring operations planning: risk assessment, Decision Tree generation and coring programmedocumentation

Generation of Geological Operations Plan and well montage

Preparation of scope of work for G&G contractual services, source and evaluate same - wellsite

geology, pore pressure evaluation, mudlogging, biostratigraphy, wireline logging QC, cuttings and

core data storage and evaluation of tenders for same

Supervision of above geological services via meetings with the service provider Single Point of

Contact (SPOC) and Wellsite Geologist.

Ensure that all geological operations documentsGeological Operations Plan, montage, offset logs

are prepared and delivered to Wellsite Geologist, rig, Drilling department, partners, Ministry of

Energy and Energy Affairs (MEEA)

Attend Pre-Spud meetings and meet with service company personnel on rig


10/10


10

Attend daily morning calls/meetings between shore-based team and rig and provide geological

updates

Ensure that daily reports and logs created during drilling operations are communicated to MEEA,

partners and contractors.

Production of Geological End of Well reports and composite logs; capture lessons learned.

Ensure the maintenance of good communication from rig to shore-base, partners and MEEA for the

reporting of all Subsurface/Drilling related documentation, reports.

Monitoring of partner-operated wells and presentation of daily and weekly operations summaries to

the Subsurface Team

Coordinate the dispatch of well data - cuttings, cores and fluid samples from the wellsite to

company base and distribution to the MEEA, partners and offsite storage as required

QC service providers data setsFinal Well Reports and logs and arrange distribution to partners,

the MEEA

QC datasets for daily posting of wellsite data to operator database for viewing by shore-based team

Liaise with service providers for presentation of products, services and new technology to

Subsurface and Drilling Teams

Encourage health, safety, security (data confidentiality) and environmental compliance.

Documents

GSTT Wellsite Operations Geology Outline