Author: admin

August 24, 2019 admin No comments exist

Earthquakes in Alberta and their possible relationship to subsurface operations such as hydraulic fracturing and waste disposal have made a lot of news over the past few years. The figure below shows the location and time distribution of 2,225 AB earthquakes from 2006 to early 2019 (AGS, 2019). There are changes from 2014 when the number of…

February 15, 2019 admin No comments exist

By influencing the mechanical character of a field, production can result in one or some of the hazards shown below in red boxes. These hazards can lead to different socio-political, environmental, health and safety, and economic risks. Let’s take a very brief look at these hazards and their consequences: Surface Facilities Damage Uncontrolled surficial subsidence…

February 6, 2019 admin No comments exist

ISIP values are favoured by many in the industry because they are accessible and relatively easy to measure. Nevertheless, there are still questions on the nature of ISIP and its relation with geological and operational parameters. What is briefly shared here includes some short excerpts on ISIP characterization from some comprehensive regional studies on unconventional…

April 17, 2018 admin No comments exist

PetroGem Toolbox (Interactive Geomechanics Platform) is a complementary product developed and released by PetroGem Inc. to promote education and practice of geomechanics in petroleum industry. The first release of the product includes an interactive tool for classical hydraulic fracturing analysis with PKN and KGD geometries that works with both Newtonian and non-Newtonian (i.e, power law…

September 9, 2017 admin 2 comments

At least in some regions, I like to think of the Duvernay Formation as a half-asleep mountain lion that wildly roars back with a steaming breath and trembles the earth beneath when awakened. The aggressive/sensitive behaviour of this formation during drilling and fracturing is because it is extremely overpressured, critically stressed and highly fractured and…

June 12, 2017 admin No comments exist

Recently, we reviewed about 90 geomechanical lab reports (from different labs, different formations, different producing companies) containing extensive measurements of all different sorts of mechanical rock properties and we could not find even a trace of Biot’s coefficient measurement. Due to its role in definition of effective stresses, we know that it is unlikely to…

May 10, 2017 admin No comments exist

PetroGem Inc. will present two talks on geomechanics at the coming Geoconvention 2017 next week. One of the talks (Tuesday May 16th, 10:40-11:05am, Room:Telus 104-106) discusses a potential mechanism that might be responsible for the observed seismicity induced by hydraulic fracturing and water disposal. The other talk (Monday May 15th, 3:00-3:25pm, Room:Telus 103) tries to show the necessity of…

June 13, 2016 admin No comments exist

Synopsis: In many cases, reservoir containment and caprock integrity assessment is considered as a one-time requirement for proving the safety of a subsurface project while it is important to remember that such assessments are dynamic processes that should continue during the entire life of the project and, in some cases, even after its cessation. This article presents a workflow for…

June 4, 2016 admin No comments exist

Access the pdf version of the article here. During the last two decades, reservoir geomechanics has been showered with attention from petroleum industry, academia and regulatory institutions mainly because modern technologies, new perspectives and economic opportunities have led to exponential growth of aggressive underground operations such as massive hydraulic fracturing, waste disposal, underground storage of…

May 26, 2016 admin No comments exist

Read the first part of this series here. Read the second part of this series here. As discussed, the common concept of compressibility in geomechanics has been developed to study the changes in either of bulk volume (Vb) or pore volume (Vp) of rocks in response to variation in confining pressure (σc) or pore pressure (p). Also, I explained the concept of…

April 12, 2016 admin No comments exist

Read the first part of this series here. Some Basics The Four Main Parameters: The common concept of compressibility in geomechanics has been developed to study the variations in either of bulk volume or pore volume of rocks in response to variation in confining pressure or pore pressure. Let’s talk a bit about these four elements before going forward. The Two…

January 26, 2016 admin 2 comments

After encountering frequent misunderstandings of rock compressibility and its applications, I decided to write a series of posts on ‘geomechanics of compressibility’ to explain its rock mechanical definition, its different types, methods of compressibility measurement and their differences and the parameters affecting this property especially stress path and hysteresis.  As an introductory post, let’s start with explaining why compressibility is important…

December 21, 2015 admin No comments exist

PDF version of this article: A Primer on the Geomechanics behind Fracturing Pressure In this post, I will break an idealized pressure curve (like what is recorded during hydraulic fracturing or pressurize fracturing tests) in different segments and explain the geomechanics behind each. I will try to answer questions such as: Why does pressure increase, decrease or…

October 27, 2015 admin No comments exist

What do we know about the geometries of hydraulic fractures? Are they really as simple as the straight planes we usually assume in our reservoir simulations and fracture designs? What factors influence their geometries? What are the geomechanical mechanisms behind geometry complexities? How do our completion designs affect fractures geometries and what completion designs can reduce the adverse…

July 9, 2015 admin No comments exist

In less than two weeks, at URTec 2015 in San Antonio, I will be presenting two papers on geomechanics of the Duvernay Formation based on the Canadian Discovery’s study on this play. The papers provide comprehensive information on different geomechanical components, workflows and results of the study. The first paper (to be presented on Monday, July 20) discusses some…

June 16, 2015 admin No comments exist

Reservoir-scale models usually integrate different physics like rock mechanics, multi-phase fluid flow, heat transfer, fracture mechanics and sometimes geochemistry and geophysics. Considering all these physics at the same time and solving their filed equations simultaneously (fully-coupled modeling), if possible, seems to be an ideal case but usually it is less practical for different reasons such as…

May 10, 2015 admin No comments exist

The emergence of unconventional plays has been so rapid during the last decade that, despite tremendous progresses, the science of petroleum engineering, which has been initially developed to treat conventional plays, has not had enough time to catch up and provide the most optimal solutions for these plays yet. The truth is the complicated nature of…

April 27, 2015 admin No comments exist

Last week, we published a Geomechanics Insight article in Discovery Digest on different methods of stress orientation characterization. The article reviews the cons and pros of different methods and gives examples for the most practical ones. These examples include using image logs, sonic anisotropy, caliper logs, core analysis, and microseismic data. All the examples are from the…

April 10, 2015 admin No comments exist

Geoconvention 2015 will be in town soon and we will be proudly presenting some of the workflows, methodologies and conclusions from our integrated geomechanical study of the Duvernay Formation, a fast-growing and attractive unconventional play in Alberta. This study is a part of The Duvernay Project conducted by Canadian Discovery Ltd., Graham Davies Geological Consultants Ltd., and Trican Geological Solutions Ltd….

November 18, 2014 admin No comments exist

Canadian Discovery Ltd. has recently made one of our Duvernay geomechanics posters publicly available through its Discovery Digest Journal website . This poster is an example of the CDL’s integrated geomechanical characterization workflow for unconventional reservoirs applied to a specific well in the Kaybob Area, Alberta. It includes the results of mechanical properties and brittleness calculations, petrophysical analysis, fracture fabric characterization, drilling…

November 4, 2014 admin No comments exist

The cover article of the September issue of Oilsands Review has been dedicated to the memory of UTF (Underground Test Facility) that was recently sealed forever by thousands of meters of concrete. Probably for a long time, UTF’s story remains a great example of government investment towards industrial and economical success. UTF is the industrial birthplace of Steam Assisted Gravity Drainage…