TOPICS OF INTEREST
Work Flow Determines Petrophysical Properties From As-Received Core Samples
This paper introduces a new core-analysis work flow for determining resistivity index (RI), formation factor (FF), and other petrophysical properties directly from an as-received (AR) set of core samples.
Gamma-Ray-Tool Characterization Avoids Traditional Limitations
In this paper, the authors discuss the characterization process for GR tools and how they behave in boreholes different from the one used in the University of Houston (UH) GR characterization pit.
Characterization of Volcanic Reservoirs Requires Comprehensive NMR Tests
This paper discusses a study undertaken to gain better understanding of nuclear magnetic resonance (NMR) characteristics of volcanic reservoirs with different lithologies.
For this year’s feature, the selected papers provide innovative work flows that assist in determining productivity, reduce the effect of uncertainty conditions, and spark rejuvenation.
US DOE To Fund 12 R&D Projects To Boost Unconventional Characterization, Recovery
Twelve organizations—universities and private technology companies—will conduct research and development on emerging shale plays and technologies covering everything from digital pressure-sensing to smart microchip proppant.
Hurricane Hits First Oil From Basement Reservoir in North Sea
This new development is the first to recover commercial quantities of oil in the UK from reservoirs that are generally considered non-productive.
Shell Partners with Startup to Get a Better Taste of the Reservoir
Wireline formation tests are a critical piece of the exploration and appraisal process, yet they come with a degree of uncertainty. The supermajor has tapped a new software developer to see if it can clear things up.
Industry Dives into UK’s New Oil and Gas Data Hub
Some 3,000 people and counting intrigued by UK oil and gas data have signed up for access to the country’s new National Data Repository. What motivated the OGA to make the data available to the public, and what can the public do with the data?
Ghawar vs. Permian Basin: Is There Even a Comparison?
While some try to put the two enormous oil producers toe-to-toe, the best thing to do might be to understand why they are different.
Pattern-Based History Matching Maintains Consistency for Complex-Facies Reservoirs
A challenging problem of automated history-matching work flows is ensuring that, after applying updates to previous models, the resulting history-matched models remain consistent geologically.
Correlation-Based Localization Effective in Ensemble-Based History Matching
To enhance the applicability of localization to various history-matching problems, the authors adopt an adaptive localization scheme that exploits the correlations between model variables and observations.
Novel Forward Model Quantifies Uncertainty of Fracture Networks
This paper presents a work flow to match the history of reservoirs featuring complex fracture networks with a novel forward model.
UK Releases 130 Terabytes of Oil and Gas Data
Data from the UK Oil and Gas Authority’s new data repository cover 12,500 offshore wellbores, 5,000 seismic surveys, and 3,000 pipelines.
Permian Basin Production Will Grow as Long as Well Productivity Allows It
Production growth in the Permian Basin requires drill rigs running at a high pace. That is challenging companies to push well productivity.
To Solve Frac Hits, Unconventional Engineering Must Revolve Around Them
The struggle to overcome the challenge of frac hits has led to a critical dialogue about which pathway the shale sector should take. One idea is to simply put the problem at the center of every major decision.
C&J Energy, Seismos Combine Technologies To Evaluate Fractures As They Are Made
Using drilling data and a downhole acoustic signal, developers aim to assess unconventional fracture networks in real time and give engineers ability to customize each stage.
Method Integration Improves Reservoir-Property Prediction in East Siberia
This paper describes a case study of the Chonskaya group of fields to demonstrate an approach to the integration of time-domain-electromagnetic (TDEM) electrical and seismic data when building a geological model for improving reservoir-property and -saturation prediction.
BP and Startup Beyond Limits Try To Prove That Cognitive AI Is Ready for Oil and Gas
BP has invested more than $100 million into nine different startup companies in the past 2 years—but only one of them wants to turn your brain into a piece of its software.
Equinor To Employ Permanent Reservoir Monitoring at Arctic, North Sea Fields
The technology will provide Equinor a continual feed of updated reservoir information from its Johan Castberg and Johan Sverdrup fields with the aim of improving well placement, production, injection, and—ultimately—recovery.
Shell, Bluware Team up on Seismic With Video Game Tech
Video games have been seen as a big waste of time for years by parents around the globe. But now, the oil and gas industry sees the underlying technology as a big time saver.
Can You Measure Reservoir Depletion While Drilling?
Shale explorers run very few logs into horizontal wells, making it difficult to understand the effects of reservoir depletion in tightly spaced wells. This new technology is trying to change that.
New Modeling Code Sees Deep Inside Fractures, May Change Thinking on Well Spacing
Operators are working with a young startup company to overhaul how the unconventional sector has traditionally interpreted one the most common tests used to influence well completion designs.
New-Frontier Reservoirs I
Recently, a lot of discussion has revolved around the benefits of multilaterals in unconventional reservoirs, but is it truly the next breakthrough for the industry, or is it all hype?
Equinor Releases Subsurface and Production Data From NCS Field
The Norwegian operator’s disclosure marks the first time all subsurface and production data from a field on the NCS will be available for public viewing.
Shaking up the Seismic Business with a Simple Idea
Understanding the behavior of subsea reservoirs traditionally takes months and millions of dollars. A new company says it can do this with a very targeted way in less than a week, for only thousands of dollars.
Total, Google Cloud to Team on AI for Upstream
Total is expanding its development and use of artificial intelligence to bolster its exploration work, collaborating with Google Cloud—which is stepping up its presence in the oil and gas industry.
Industry Q&A: Physics-Based Reservoir Simulation for Enhanced Data Analysis and Risk Evaluation
Indy Chakrabarti, senior vice president of product management and strategy at Emerson Automation Solutions talks about developments in software solutions for the oil and gas industry.
Unconventional-Reservoir Characterization With Azimuthal Seismic Diffraction Imaging
The complete paper proposes an azimuthal plane-wave-destruction (AzPWD) seismic-diffraction-imaging work flow to efficiently emphasize small-scale features associated with subsurface discontinuities such as faults, channel edges, and fracture swarms.
Well-Performance Study Integrates Empirical Time/Rate and Time/Rate/Pressure Analysis
The purpose of the complete paper is to create a performance-based reservoir characterization by use of production data (measured rates and pressures) from a selected gas-condensate region within the Eagle Ford Shale.
Catalog of Well-Test Responses in a Fluvial Reservoir System
The complete paper aims at a better understanding of the effect of channel content in complex fluvial channel systems on well-test-derivative responses.
Better Permeability Estimation From Wireline Formation Testing
The complete paper presents different methods of using pressure-transient data from WFTs; many of these methods are summarized here.
In Search of Data-Driven Oilfield Reality
Many startup companies promote the wonders of analytics but few can ensure that the methods used and data generated live up to the hype.
Joint Industry Project To Develop Downhole X-Ray Technology
ConocoPhillips and Statoil Petroleum have signed a joint-sponsorship-development agreement with Visuray Technology to fund development of a downhole cement-integrity-evaluation technology that will have the capability of evaluating cement integrity even behind multiple casing strings.
Estimation of Flow and Hysteresis Parameters Applicable to WAG Experiments
In the complete paper, a new assessment of the WAG-hysteresis model, which was developed originally for water-wet conditions, was carried out by automatic history matching of two coreflood experiments in water-wet and mixed-wet conditions.
Stress Dependence of Sandstone Electrical Properties and Deviations From Archie’s Law
The resistivity index (RI) of Fontainebleau and Bentheimer sandstones was investigated at ambient and reservoir pressures down to low water saturations. The RI measurements show that both sandstones display Archie behavior at elevated pressure.
In-Situ Fluid-Composition Analyses Improve Reservoir Management
This study focuses on recent experience in Saudi Arabia with crude-oil compositional analyses during pumpout with a wireline formation tester (WFT).
Improving the Relationship Between Flow-Zone Indicators With Lithofacies
The F field in the Middle East currently has more than 40 producing wells in the center of the structure. The uneven well distribution limits the understanding of 3D reservoir characterization, particularly in the flank areas.
Formation Evaluation: A Critical First Step
Emerging technologies have helped bring about multilateral, maximum-contact, and smart-completion wells, allowing reservoirs to be developed and produced much more efficiently and economically. In this, formation evaluation plays a critical role.
New-Frontier Reservoirs I
You want to know how to immediately make a step change in your business and improve your own promotion prospects. You want to know the key technologies you should be implementing now. To develop your longer-term strategy, you want an awareness of future trends now. Consider your wish granted.
Doing Better By Doing Less: Using Well Logs to Target Productive Rock
The rising cost of fracturing offers a significant incentive for finding ways to avoid unproductive rock. One entrepreneur says he can use standard well logs to target the slice of rock likely produce most, and avoid the rest.
Pseudodensity Log Generation by Use of Artificial Neural Networks
This paper will describe how one integrates a comprehensive methodology of data-mining techniques and artificial neural networks (ANNs) in reservoir-petrophysical-properties prediction and regeneration.
Major Alaskan Discoveries Promote Great Expectations
Three major finds have shattered assumptions about what is possible in the most explored parts of Alaska’s North Slope.
Novel Solutions for Transient Sandface Temperature in Dry-Gas-Producing Wells
The application of high-precision downhole temperature sensors has resulted in pressure-transient analysis (PTA) being complemented or replaced by temperature-transient analysis (TTA).
Case History: High-Pressure/High-Temperature Underbalanced Drillstem Testing
This paper describes the method developed to achieve underbalanced drillstem testing (DST) in a deepwater field offshore India.
Use of Modern Reservoir Characterization in Mature Fields To Unravel Hidden Reserves
This paper discusses the successful, fully integrated, 3D Earth modeling (EM) and dynamic reservoir simulation of the Hollin Formation in the Lago Agrio Field within an operator’s first producer field in Ecuador.
Research Aims To Cut Time and Cost of Characterizing Tight Gas Sandstone Reservoirs
A recently launched joint industry project (JIP) is working to improve petrophysical analysis methods to reduce the time and expense of characterizing tight sandstone gas reservoirs for exploration, appraisal, and production.
New Method Adds Value to Wolfcamp Porosity, Organic-Matter Measurements
A new technique that analyzes scanning electron microscope (SEM) images of formation samples has been used to measure porosity and total organic carbon (TOC) in the Wolfcamp Shale of the Delaware Basin in west Texas.
Pores to Production: The Nanoscale Search for More Oil
The story of unconventional oil and gas technology development has been focused on fractures. The formula has been more stages, more sand, and more water, targeting the most productive spots.
Use of Partitioning Tracers To Estimate Oil-Saturation Distribution
Partitioning interwell tracer tests (PITTs) have been used to estimate remaining oil saturations (ROSs) during waterflooding.
Engineered Shale Completions Based on Common Drilling Data
In this study, the authors demonstrate a reliable, cost-effective methodology that empowers shale operators with reservoir data on every well.
3D Printing Reservoir Rocks May Drive New Insights
Researchers at Heriot-Watt University in Edinburgh, Scotland, are building replica core samples using 3D printers and installing sensors inside them as they go. Their goal is to directly monitor pore-scale flow behavior from the inside of these so-called “smart rocks.”
Better, Less Tedious, Fault Interpretation
The tedium of identifying small faults in often murky seismic images pushed Dustin Dewett, an associate geophysicist for BHP Billiton, to develop a better way to use the tools at hand.
Chemical Analysis of Flowback Water and Downhole Gas-Shale Samples
In this study, samples of flowback water and downhole shales are analyzed to investigate the mechanisms controlling the chemistry of flowback water.
Formation-Evaluation Log-Off Results for Coalbed-Methane-Field Development
Coalbed methane development can require a large volume of wells, but the costs of logging can be prohibitive, so alternate formation-evaluation solutions are being evaluated. This paper compares state-of-the-art mining logging technology with conventional oil-and-gas approaches.
Upon Further Consideration, US Gas Reserves Look Bigger
The list of the biggest gas plays in the US is being revised as the US Geological Survey creates new estimates based on additional drilling results and available rock samples. New at Number 2 is the Mancos Shale on the Western Slope of the Rockies with 66 Tcf in recoverable reserves.
Ohio Study Tries To Pin a Number to Earthquake Risk
Research and development firm Battelle is working on a new induced-seismicity study that aims to help wastewater disposal well operators in Ohio stay on the good side of state regulators.
New Multilayer Boundary-Detection Service in Bohai Bay, Northern China
A new multilayer boundary‑detection service has been introduced to resolve the geological uncertainty associated with horizontal wells in Bohai Bay. Geosteering and real time reservoir characterization were used to reduce the uncertainty.
Reconciling Log-Derived Water-Saturation and Saturation-Height Function Results
Saturation-height functions (SHFs) play a key role in reservoir description and in quantifying oil in place. The functions must compare well with other sources of water saturation (Sw), such as core measurements and well-log interpretations. This study reconciles different sources of Sw.
A More-Rigorous Development Framework for Unconventional Reservoirs
This paper describes how seismic reservoir integration, advanced production analysis, and accurate nanoscale and 3D full-field simulations may address profitability issues and help oil companies to be more efficient in developing unconventional portfolios.
Production Performance in the In-Fill Development of Unconventional Resources
This paper presents results from the analysis of the effect of in-fill drilling on parent-well performance, and describes a simplistic approach to understanding the effect of the quest for operational efficiencies and economic cycles on development strategies.
Grinding Out Big Data From Tiny Samples
A company known for being a pioneer in methods built on imaging ultratight rock at the core level has built a business testing drilling cuttings to help identify productive, fracturable rock to help operators design better completions.
DNA Sequencing: A New Diagnostic Tool for Shale Wells
For the past 2 decades, the use of DNA sequencing technology has largely been relegated to the domains of criminal forensics and the healthcare industry. One company is betting that the shale industry soon will join that list.
Broadband Seismic Acquisition: Implications for Interpretation and Reservoir Models
Acquiring new 3D broadband seismic data of a gas field containing legacy 3D conventional towed-streamer seismic data.
A Nonisothermal Wellbore Model and Its Application in Well Testing
Although the wellbore is in a nonisothermal environment, heat transfer between the fluid in the wellbore and the formation is often ignored and temperature is usually assumed constant in data interpretation, which will lead to misunderstanding of the pressure profile.
Complex Reservoir Architecture Validated by Integrating Well-Testing Outcomes
This work presents a real field example in which the integration of well-testing and geological interpretations increased the understanding of a complex, heterogeneous reservoir.
Production-Logging Tools Facilitate Well Testing in Challenging Environments
The Pugang gas field, one of the biggest inland gas discoveries of the last decade in China, has hydrogen sulfide (H2S) concentrations as high as 10%, making surface- and downhole-facilities design and execution challenging.
Over the past year, despite the naysayers’ comments and predictions, the usual creativity and ingenuity of engineers and scientists in the oil industry were ubiquitous.
Magnetic Resonance-While-Drilling System Improves Understanding of Complex Reservoirs
Reservoirs consisting of heterogeneous carbonates and shaly sands pose formation evaluation challenges for conventional logging-while-drilling (LWD) measurements. Magnetic resonance techniques hold promise for improving understanding of these reservoirs.
Salty Flowback Research May Explain Fluid Movement in Shale
An area of great interest to those researching flowback is the interaction of water and salt inside the shale reservoir. After a well is stimulated, the flowback fluids tend to show a rising concentration of salt that falls back to near zero over time.
Following Flowback With Chemical Tracers
Rising demand for flowback technologies to reduce uncertainties is leading to the creation of more hydrocarbon and water tracers. These chemical-based tracers may play an important role in the shale industry’s effort to come up with more cost-effective fracture designs.
Digitizing Core Scans Brings Old Methods into 21st Century
Pulled directly from the reservoir rock, core samples provide critical data used to determine how exploration should proceed. Until recently, core analysis remained old school, however, there is an ongoing transition to bring the process of core description into the digital age.
Dynamic Fault-Seal Breakdown - Investigation in the North Sea Egret Field
The ability to predict the effect of faults on locating remaining hydrocarbon is critical to optimal well-placement, reservoir-management, and field development decisions.
Pressure-Transient Analysis as an Element of Permanent Reservoir Monitoring
Permanent downhole gauges (PDGs) provide vast amounts of pressure-transient and rate data which may be interpreted with improved pressure-transient-analysis (PTA) approaches to gain more knowledge about reservoir dynamics.
Investigating Aperture-Based Permeability and Capillary Pressure in Rock Fractures
This paper provides a more straightforward method for estimating stress-dependent permeability and capillary pressure in rock fractures.
Understanding Unusual Diagnostic-Fracture-Injection-Test Results in Tight Gas Fields
In hydraulic fracturing, the use of diagnostic-fracture-injection tests (DFITs) can provide valuable information.
A new miniature pressure/temperature sensor comes packaged inside a tough small ball capable of traveling to the bottom of a well while drilling and returning with data on board.
Selling a New Way of Looking Into Rocks
FEI is a maker of high-powered microscopes whose growth plan in exploration and production includes building a service company.
Integrating PCA and Streamline Information for History Matching Channelized Reservoirs
Although principal-component analysis (PCA) has been applied widely to reduce the number of parameters characterizing a reservoir, its disadvantages are well-recognized.
Assisted-History-Matching Benchmarking: Design-of-Experiments-Based Techniques
As the role of reservoir-flow simulation increasingly affects existing operations and field-development decisions, it follows that rigor, fitness, and consistency should be imposed on the calibration of reservoir-flow models to dynamic data through history matching.
Tactics for Use of Diagnostic Fracture Injection Tests in Unconventional Reservoirs
To achieve optimal production from unconventional reservoirs, it is useful to determine the permeability, pore pressure, and state of stress of rock strata.
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09 August 2019
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