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November 2017
2nd Nov 2017 Beetaloo Sub-basin

8th Nov 2017 Type Wells

Society of Petroleum Engineers – Qld Section

Technical Presentation

8 November 2017


Type Wells

with Randy Freeborn, Chief Research Engineer at Energy Navigator



Type wells are rate-time production profiles that engineers use to represent the expected production rate and recovery from newly drilled and planned wells. While type wells could result from detailed engineering evaluation (RTA, simulation), it is more common to create a type well from the production history of representative wells.

Historically, type wells have proven to be unreliable, leading companies to make adverse investment decisions that are sometimes fatal. The lecture content will examine the pitfalls associated with various methods of creating type wells and offer suggestions that will improve reliability. The suggestions will include aggregation type wells, the most recent method reported in the literature.

Each year, companies use averaged well production (type wells) to support billion dollar expenditures to buy and develop oil and gas resources. These type wells often have unrepresentative rate-time profiles and recoveries over-stated by as much as 50%. These intolerable errors result from common, but incorrect, assumptions in constructing type well production profiles, and the selection and weighting of analog wells.

Literature related to constructing type wells is sparse and incomplete. This lecture will fill that gap and lead participants to informed decisions for best practices in type well construction. Hind casting examples show that only small errors in recovery result when the type well construction combines historical and predicted production rates. This improvement results from using educated estimates (not intrinsic values) for months with no data to average, and from individual well forecast errors that offset one another. A Monte Carlo method incorporates risk and leads to better well selection and weighting factors, achieving more representative rate-time profiles. The recommended methodology incorporates aggregation and choosing different uncertain parameters. Parameter choice is important because it makes little sense to risk recovery (e.g., P90 for proved reserves) when the application demands a different parameter such as present value.

Type well construction methods are common, but they have errors that are difficult to detect. Evaluators are likely using type wells for financial analysis, facility design, cash flow prediction, reserve estimation and debt financing without knowledge of the inaccuracies and options to improve accuracy.



Randy Freeborn is a Distinguished Lecturer of the SPE on the subject of type wells and a subject matter expert in empirical forecasting and related technology. Currently, he is Chief Research Engineer at Energy Navigator where he is responsible for identifying and inventing engineering technology for inclusion in the company’s reserve management software. He has been a professional engineer for 44 years and is a member of SPEE and SPE. Freeborn has prepared numerous technical papers for presentation at conferences, workshops and industry meetings. He has given guest lectures at the University of Houston and Texas A&M, and has been called as an expert witness.

22nd Nov 2017 Hydraulic Fracturing: Geomechanics, Design and Evaluation

Hydraulic Fracturing: Geomechanics, Design and Evaluation

3 day workshop

Course Description

In unconventional reservoirs, hydraulic fracturing is the primary stimulation strategy to enable commercial resource development. Creation of successful hydraulic fractures requires identification of the prevailing stress regime and an understanding of the target reservoir to implement an effective fracture stimulation strategy. This three-day course will provide participants with in-depth knowledge of the geomechanics and engineering aspects of hydraulic fracturing from two renowned subject matter experts.

Course Outline

  • Unconventional resources geomechanics – theory, rock-mechanical properties, pore pressure, rock strength
  • The vertical stress profile, stress regimes and wellbore stability
  • Determination of s-hmin, the  diagnostic fracture injection test (DFIT) and DFIT before closure analyses (BCA) techniques
  • DFIT after closure analysis techniques
  • Formation damage and stimulation strategies
  • Hydraulic fracturing mechanics & simulation
  • Hydraulic fracturing fluids, additives and proppants
  • Hydraulic fracturing diagnostics & optimisation
  • Production data analysis and frac optimisation

Special Requirements

Attendees are to provide their own windows 7+ laptop with Microsoft Excel installed. Demo copies of the IHS WellTest and Harmony software will be provided.

Who should attend?

Reservoir engineers, production technologists, geoscientists and team leaders involved in integrated teams addressing unconventional reservoir stimulation design, execution or evaluation as well as unconventional field development planning and implementation.  The course assumes foundation background knowledge in geology, reservoir engineering, hydraulic fracturing and unconventional reservoir characterization.


 Raymond L Johnson

Raymond (Ray) L. Johnson, Jr. is presently Professor of Well Engineering and Production Technology at the University of Queensland.  In addition, he is Principal at Unconventional Reservoir Solutions, serves as Adjunct Associate Professor at the University of Adelaide and has been an Adjunct Fellow at the University of Queensland. He has a PhD in mining engineering, a MSc in petroleum engineering, a Graduate Diploma in Information Technology, and a BA in Chemistry. Ray is active in the Society of Petroleum Engineers (SPE), past chair of the SPE Queensland Section, 2013 and 2015 Co-Chair of the SPE Unconventional Reservoir Conference and Exhibition Asia Pacific.  He has over 37 years of hydraulic fracturing experience on several continents. Throughout his career, Ray has been involved as a technical committee member for numerous SPE technical conferences focusing on: reservoir geomechanics; hydraulic fracture design execution and evaluation; and, unconventional resource development.

Thomas Flottmann

Thomas is Origin’s Chief Geoscientist working as Principal Geologist in the E&A team, responsible for trials and adaptation of new technologies.  He did his undergraduate studies in South Africa and completed a PhD on continental deep drilling at the University of Frankfurt (W. Germany) in 1988. After post doctoral employment in Australia he worked in the oil and gas industry for 25 years - predominantly in structurally and geomechanically challenging exploration and development projects in Australia, Middle East, Central Asia, SE Asia and Europe. Thomas has been involved intermittently in CSG projects for over 15 years. Current work focuses on the adaptation of geomechanical concepts and in-situ stress characterization for reservoir optimization, fracture stimulations and horizontal drilling projects in Coal Seam Gas reservoirs in SE Australia. He is member of SPE, AAPG and ARMA.

Upcoming Events
June 2018
18th Jun 2018 SPE DL Presentation - Integrated Historical Data Workflow

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