PETROLEUM GEOMECHANICS2011-2012

Chiara Deangeli

DITAG (DIATI) ground floor

011 090 7678

chiara.deangeli@polito.it

Office hours: email reservation necessary

Timetable

Monday Tuesday Thursday

11.30-13.00 14.30-16.00 13.00-14.30

Room 15 Room 15 Room 7B

PETROLEUM GEOMECHANICS2011-2012

Timetable

Monday

11.30-13.00

LAIB5D

from March 19 (LAIB5D)

Organization of the course

The course is organized in

•Lectures

•Practical lessons

•Computer exercises from March 19

Outline of the course

Introduction

Sedimentary rocks and rock masses

Stress, strain, pressure, strength, elasticity

Failure mechanicsFailure mechanics

Mechanical properties of rocks

In situ state of stress

Stresses around boreholes

Reservoir geomechanics

Date Subject Type hours

March 5 Introduction L 1,5

6 The state of stress. L 1,5

8 The state of stress: principal stresses; Mohr Circles;L 1,5

12 Principal stresses –Mohr circles. ExercisesE 1,5

13 The state of stress:

stress invariants; deviatoric stresses; fluid pressures; geostatic vertical

stresses

L 1,5

Detailed programme

stresses

15 The state of stress: the Terzaghi Principle; drained and undrained

conditions; Stress pathsL 1,5

19 Effective stresses and Determination of the state of stress LAIB 1,5

20 The state of strain; geometrical interpretation of infinitesimal strains L 1,5

22 Constitutive laws: Linear elasticity; ILE material L 1,5

26 Effective stresses – Stress paths LAIB 1,5

27 Constitutive laws: anisotropy; Non linear elasticity; Plasticity L 1,5

29 Solution of Continuum mechanics problems L 1,5

April 2 Effective stresses – Stress paths LAIB 1,5

3 Failure Mechanics: Strength of homogenous isotropic rock material L 1,5

Easter Holidays 5-11

12 Failure Mechanics: Strength of homogenous isotropic rock

material; Strength of anisotropic rock material in triaxial

compression

L 1,5

16 Failure Mechanics: the MC and HB criterion LAIB 1,5

17 Failure Mechanics: the MC and HB criterionE 1,5

19 Failure Mechanics: Shear Strength of rock discontinuities; Strength

of rock massesL 1,5

23 Stress paths LAIB 1,5

24 Mechanical properties of rock material from lab tests: Uniaxial

compression testsL 1,5

Date Subject Type hours

compression testsL 1,5

26 Mechanical properties of rock material from lab tests: Uniaxial

compression testsL 1,5

30 Uniaxial compression test LAIB 1,5

May 1: National Holiday

3 Mechanical properties of rock material from lab tests: triaxial tests

dry conditionsL 1,5

7 Uniaxial compression test LAIB 1,5

8 Mechanical properties of rock material from lab tests: triaxial tests

in drained and undrained conditions; L 1,5

10 Mechanical properties of rock material from lab tests: triaxial tests

in drained and undrained conditionsL 1,5

14 Interpretation of direct shear tests on rock discontinuities LAIB 1,5

15 Interpretation of TX Test L 1,5

16 Determination of elastic moduli and strength parameters from lab

testsL 1,5

21 Triaxial compression tests. TSP and ESP from TX tests LAIB 1,5

22 Skempton coefficients L 1,5

24 Mechanical properties of rock material from lab tests: Oedometer

test Index testsL 1,5

28 Underground stresses L 1,5

29 Underground stresses L 1,5

Date Subject Type hours

29 Underground stresses L 1,5

31 Stresses around boreholes L 1,5

June 4 Triaxial compression tests. TSP and ESP from TX tests LAIB 1,5

5 Stresses around boreholes L 1,5

7 Stresses around boreholes L 1,5

11 Determination of the state of stress around boreholes LAIB 1,5

12 Principles of hydraulic fracturing L 1,5

14 Reservoir Geomechanics L 1,5

Outcomes

Acquire a basic knowledge in the geomechanics field in

order:

• To understand, from an engineering point of view, the

processes related to the mechanical aspects ofprocesses related to the mechanical aspects of

sedimentary rocks, during hydrocarbon production

• To handle basic problems related to the mechanical

behavior of rocks

Reference textbooks• Fjaer, Holt, Horsrud, Raaen & Risnes, 2008. Petroleum

related Rock Mechanics, 2nd edition, Elsevier, Oxford

• Brady & Brown, 2004. Rock Mechanics, 3rd edition, Kluwer

Academic Publisher, Dordrecht

• Lambe & Withman, 1979 Soil Mechanics, John Wiley & Sons,• Lambe & Withman, 1979 Soil Mechanics, John Wiley & Sons,

New York

• Lancellotta, 2009. Geotechnical Engineering,, 2nd edition,

Taylor & Francis, New York

• Zoback, 2007. Reservoir Geomechanics, Cambridge

University Press, New York

Didactic material

The texts, equations and figures shown during lectures

will be available on the course web site.

The solution to the exercises will also be available in

the course web site.the course web site.

All of my lectures will be delivered with the help of PowerPoint. All the

presentations will be available on the course web site.

So, if all the material is on the web and in books, why attend classes?

Caution: The presentations contain only essential notes and

illustrative material. They should enrich the narrative, but cannot

Attendance

really replace it. If you are not in class, you may miss explanations,

descriptions, discussion and other stuff that is supposed to make you

understand the material. That is why we still have a physical

university.

What should I do then?

1)Attend classes 2) keep your own notes 3) Ask questions, participate

The subjects of the course are explained during the

lectures and practical lessons. Thus the majority of

questions must be asked in class.

The office hours MUST NOT be intended as private

Attendance

The office hours MUST NOT be intended as private

lessons.

After the explanation of a topic some practical

examples are presented.

You must bring a pocket calculator, in order to solve

the exercises.

Attendance

the exercises.

Computer exercises at LAIB.

The exercises are uploaded on course web site just before

the class.

The explanation of the exercises starts at 11.30.

After the explanation the students can download the

exercises.

Attendance

exercises.

The solution to the exercises must be sent by email to the

Professor 5 minutes before the end of the lesson.

Examination

The EXAM consists of a written test with:

• Theoretical questions (15 points)

• Practical exercises (15 points)

Examination

Since the Petroleum Geomechanics Course is attached

to the Structural Mechanics Course, the final mark of

the complete exam will be the arithmetic mean of the

two partial marks (minimum partial mark for both tests:two partial marks (minimum partial mark for both tests:

18)

30 cum laude (only when the total sum of the two exams is 60) plus 1 oral

question

Examination Policy

The use of a pocket calculator is allowed.

The use of the following material is NOTallowed:allowed:

• (PDAs) personal digital assistants, palmtop computers, orsimilar mobile devices

• Mobile phones

• Didactic material (books, written texts, class notes, etc..)

Examination Policy

No communication regarding the examination is allowed

inside or outside the room. All questions about the

examination should be directed to the Professor.

It is mandatory to register for the exam. There are deadlinesIt is mandatory to register for the exam. There are deadlines

for the registration.

I do not accept late email registration