pab 4323 l-1
DESCRIPTION
stimulationTRANSCRIPT
PAB 4323 – WELL STIMULATION TECHNIQUES
SEMESTER 7
ByBy
Dr. Aliyu Adebayo Sulaimon([email protected])
DISCUSSIONS
–
Getting to know each other
Important Information
Outcome Based Education (OBE) Structure of the course (outlines/contents) Lesson plan (Lecture, buzz-group, tutorials, chalk and talk, etc.)
Teaching evaluation (Anonymous feedbacks) UTP attendance policy (University required to present monthly
report on the international attendance to MOHE – Min. of Higher Educ.)
Assessment plan Attendance - 10% Assignment/Classwork - 30% Test/Quiz - 20% Exam - 40%
Course Major Contents
Formation damageWell stimulation techniques Hydraulic fracturingMatrix acidizing Perforating methods Sand control methods Design and optimization processes
Questions?
Course Major Contents Formation damage
Damage mechanisms• Mechanically induced • Chemically induced • Biologically induced • Thermally induced•
Operational sources of formation damage• Drilling operation• Completion operation• Production operation• Injection operations
Assignment and Review
Course Major Contents
Well stimulation techniques Reasons for stimulating
Primary forms of well stimulation• Wellbore clean-up• Wellbore clean-up• Matrix treatment• Fracturing
Candidate selection
Selecting a technique
Assignment and Review
Course Major Contents
Sand control methods
Introduction Causes of sand production Causes of sand production Operational problems associated with sand control Sand control methods
Assignment and Review
Course Major Contents
Perforating methods Shaped charge characteristics and performance Assessment of Charge performance Perforating gun systems Perforating gun systems Operational considerations
Design and optimization processes
Assignment and Review
References Lake, L.W. (2007): ‘Petroleum Engineering Handbook’, SPE Richardson
Economides, M.J. and Nolte K.G. (2000): ‘Reservoir Stimulation Handbook, Wiley
Schechter, R.S. (1992): ‘Oil Well Stimulation’, First Edition, Prentice-Hall Inc.
Guo, B.; Lyons, W.C.; and Ghalambor, A. ((2007): ‘Petroleum Production Engineering’, Elseviers’ Gulf Professional Publishing, Oxford, U.KElseviers’ Gulf Professional Publishing, Oxford, U.K
Allen, T.O. and Roberts, A.P. (2004): ‘Production Operations 1 and 2’, Fourth Edition, OGCI and PetroSkills Publications,
Yew, C.H. (1997): Mechanics of Hydraulic Fracturing, First Edition, Gulf Publishing Company
Lecture 1 – Introduction
Review of Basic Concepts
Learning Outcomes
At the end of this class, students should be able to:
Describe the flow regimes in a reservoir
Mathematically differentiate between the flow regimes Mathematically differentiate between the flow regimes
Illustrate graphical representation of pressure vs radial distance at different times for each of the flow regimes
Define ‘skin effect’ and describe its main contributors
Review Topics
Types of Flow
Transient flow (Infinite acting reservoir)
Steady state (CPB exists) Steady state (CPB exists)
Pseudo-steady state (NFB exists)
Concept of skin
Flow regimes in a reservoirPr
essu
re (p
si) Transient Late
transient
Pres
sure
(psi
)
Time (hr)
Steady state
Pseudo-steady state
Class Attempt:
Can you sketch the Pressure (P) vs Radial Can you sketch the Pressure (P) vs Radial Distance (r) Curve for each of the flow regimes?
Pressure vs Drainage Radius Profiles for Different Time Intervals (Steady State Flow)
Pres
sure
(psi
)Pr
essu
re (p
si)
Radial distance (ft)
Profiles of Pressure vs Drainage Radius at Different Time Intervals (Transient Flow)Pr
essu
re (p
si)
Pres
sure
(psi
)
Radial distance (ft)
Profiles of Pressure vs Drainage Radius at Different Time Intervals (Pseudo-Steady Flow)
Pres
sure
(psi
)Pr
essu
re (p
si)
Radial distance (ft)
The Concept of Skin Actual pressure drop higher than calculated
Skin is related to any permeability impairment due to wellbore damage caused by drilling, completion or even production operations
Skin Factor (S.F) – a numerical value which can indicate the extent of damage or permeability improvement at the wellbore
S.F can be positive (i.e. damage) or negative (i.e. stimulated)
Types of Skin
Corrected Darcy’s equation
Review Questions (T/F)
There are four flow regimes in a reservoir system A well is producing in pseudo-steady state when the
pressure pulse is felt in all the boundaries of the drainage areadrainage area
For a reservoir bounded by an aquifer, the rate of change of pressure at the boundary is constant
A zero skin factor indicates that the wellbore is partially stimulated rather than damaged
ASSIGNMENT 1
Questions?
Thank youThank you