TOPICS OF INTEREST
Well-Abandonment Solutions Use Bismuth and Thermite Effectively and Safely
This paper demonstrates a new way to create gas-tight seals during well abandonment, overcoming the limitations of traditional methods and reducing the operator’s liability and potential environmental impact after decommissioning has been completed.
Cementing and Zonal Isolation
I am encouraged that we, as an industy, continue to refine and tweak our practices to solve zonal-isolation and cementing challenges in every well environment in which we work. As cementing techniques are improved, so, too, are the cement-evaluation methods and work flows.
Activating Shale Can Create Well Barriers
This paper discusses shale creep and other shale-deformation mechanisms and how an understanding of these can be used to activate shale that has not contacted the casing yet to form a well barrier.
Microchannel Remediation of a Cement Packer Unlocks Mature-Field Potential
Well RXY is located in Cairn’s Ravva offshore field in the Krishna-Godavari Basin in India. One goal for the field was significant crude production by means of a secondary reservoir section.
Pulsed-Neutron Comparison of Open- and Casedhole Wells: An Alaskan Case Study
This paper compares the results of gas identification and lithology identification using pulsed-neutron spectroscopy in openhole and casedhole environments.
Old CaTS Technology Learns a New Trick
Acquiring data from an abandoned subsea well has been done before, but never quite like this.
As I read through the abstracts and papers that have been presented in the past year, I notice several key themes: verification of cement placement, development of new materials as a barrier, development of new additives to improve the cement barrier, and enhancement of existing techniques.
Technology Trends in Evaluating Cement Jobs Using Logging Tools
This paper reviews the technology trends in cement-job evaluation using logging tools and considers the main advantages and concerns associated with each technology.
Continuous Innovation Achieves Better Zonal Isolation in Extended-Reach Wells
Operators at a UAE field experienced several challenges while cementing production sections. A systematic approach was applied that used standard cementing best practices as a starting point.
Managed-Pressure Cementing: Successful Deepwater Application
This paper reviews a successful managed-pressure-cementing (MPC) operation and presents findings and lessons learned.
Simultaneous Drilling, Completions Concept Hopes To Extend Drilling Distances to 30 km
This paper presents a concept that enables simultaneous drilling and completion, with an aim to extend well reach substantially and with an ultimate objective of constructing 30-km-long production wells.
Design and Surveillance Tools Help Lower Integrity Risks for High-Temperature Wells
Risk Assessment of Fluid Migration Into Freshwater Aquifers in Colorado Basins
Wellbore-construction methods, especially casing-and-cementing practices for the protection of freshwater aquifers, have been reviewed in the Piceance, Raton, and San Juan Basins in Colorado.
System Adds Reliability, Efficiency to Attaching Well Construction and Completion Tools
A new attachment system overcomes the limitations of traditional methods for securing tools and accessories to drilling and completion strings.
Improving Casing Integrity by Induction Brazing of Casing Connections
Brazing technology allows metallurgical joining of dissimilar materials by use of a filler material.
Investigating the Benefits of Rotating-Liner Cementing and Impact Factors
This paper discusses an expandable-liner-hanger (ELH) system that provides liner rotation during the liner deployment and the cementing operation while providing a hydraulically energized liner-top seal upon setting.
Real-Time Monitoring of Piezoresistive Smart Cement To Verify Operations
A field well was designed, built, and used to demonstrate the concept of real-time monitoring of the flow of drilling mud and smart cement and the hardening of the cement in place.
Despite cement’s remarkable properties, the search continues for enhancements in the areas of cost and isolation performance. Efficiencies and enhancements have been explored even to the point of replacing cement with other materials.
Deepwater Tieback-Cementing-Design Challenges and Engineering Approach
This paper focuses on cementing-design challenges and discusses the engineering techniques used to approach them.
Drilling Improvements Work Toward the Perfect Well in the Eagle Ford
In the Eagle Ford, an integrated approach to engineering and operations was key to optimize performance and improve understanding of the area.
Solving the Casing-Wear Puzzle Using Stiff-String Model
Precise casing-wear prediction is important for improving well integrity and longevity, while simultaneously making casing designs more cost-effective. There are no industry guidelines for casing-wear prediction. This article presents a validated predictive model.
Cementing is central to the discussion of zonal isolation and well integrity.
New Approach Tests Cement-Sheath Integrity During Thermal Cycling
Operators in the North Sea have been concerned about the ability of the cement sheath to maintain sealing integrity because of the increasing number of reported failures in mature wells. This paper presents results from a new laboratory setup to visualize the source of issues.
An Integrated Approach to Solving Sustained Casing Pressure in the Cana-Woodford Shale
Many wells in the Cana-Woodford shale suffer from chronic sustained casing pressure (SCP) because of poor cement-sheath bonding.
Design Procedure for Cementing Intercalated Salt Zones
This work demonstrates cement design that includes evaluating cement-sheath mechanical integrity in intercalated salts.
The Wide Divide Between Fracturing Plans and Reality
What is observed when an unconventional well is fractured is often at odds with what was expected by those who planned the job.
Tandem Downhole-Isolation-Valve System Eliminates Snubbing
The operator of an offshore jackup rig in the North Sea required safe and efficient deployment of the completion string without killing the well during tripping.
Managed-Pressure-Drilling Technology Delivers Challenging HP/HT Drilling Campaign
The Shearwater field is a deep, high-pressure/high-temperature (HP/HT) reservoir located in the UK Central Graben of the North Sea.
Increasing Cement-Sheath Integrity To Reduce Gas Migration in the Marcellus Shale Play
This study examines the effects of drilling, completion, and production operations and their associated cyclic stresses on a cement sheath.
Deepwater Gas-Zone Shutoffs With Wireline in Openhole-Gravel-Pack Completions
An operator successfully executed two wireline through-tubing gas-shutoff (GSO) workovers in high-angle openhole-gravel-pack (OHGP) completions to isolate high-gas/oil-ratio (HGOR) zones, resulting in significantly increased oil production.
Use of Biodegradable Materials During Refracturing of a Horizontal Well
One approach to refracturing involves the use of mechanical diverters such as perforation balls and rock salts, which may be useful for one stage; however, cessation of pumping operations results in these diverters falling out of the perforations or dissolving.
Offshore Industry Gets a Fresh Look at Foamed Cement
An ongoing research project started nearly 3 years ago by the US Department of Energy’s National Energy Technology Laboratory (NETL) is shedding new light on what really happens to foamed cement as it is pumped deep down offshore wells during completions.
FIBER OPTICS: Downhole Fiber-Optic Monitoring: An Evolving Technology
It has been an impressive comeback for a technology that once stood on the brink of failure. The upstream oil and gas industry has largely resolved crippling technical challenges that shortened the life of fiber-optic cables in downhole applications and is now working on a big encore.
Stinger or Tailpipe Placement of Cement Plugs
The most common method used for the placement of cement plugs is the balanced-plug method using drillpipe, tubing, or a combination of both.
A Fully Completed Solution With Zonal Isolation in Norway
This paper describes the design, testing, installation, and performance of the first fully completed well using an intelligent inner completion inside an uncemented liner with openhole packers for zonal isolation.
Many good well-construction-technology papers came out last year, as well as a couple on older technologies that either had not been published earlier or had been released and were underappreciated.
Newtonian Fluids in Cementing Operations in Deepwater Wells
This paper discusses the factors to be taken into account when designing cement jobs using fluids in turbulent flow and some of the overlooked benefits of using turbulent-flow design for mud removal.
New Casing Valve in a Deep-Well Sour Environment
This paper describes the first application of the 10¾-in. CV in a deep-well sour environment.
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