Formate Fluids and Environmental Regulations: A Global View of Benefits and
Challenges

Gilbert, Ylva Maria; Pessala, Piia; Vaahtera, Anu; Raivio, Tuomas

doi:10.2523/110891-ms

Cited by 2 publications

(1 citation statement)

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“…In particular, it is recognised that when an HSE risk that is realised (i.e. an accident occurs) this affects not only the immediate risk receiver and carries direct cost, but also affects corporate image and may even carry long term liabilities 7 .…”

Section: Drivers For Systematic Hse Chemical Risk Assessmentsmentioning

confidence: 99%

Managing Chemical Risk at the Point of Procurement - Simple Tools for Efficient Chemical Risk Reduction

Gilbert¹,

Raahauge

Loughran

et al. 2008

All Days

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Consideration of the risk associated with operations at the earliest possible stage is a key factor for effective chemical HSE risk management. This paper describes the operational and strategic decisions behind the design and implementation of a method developed for Maersk Oil, where the responsibility for chemical risk assessment is transferred to the earliest possible point in the chemical handling chain -the procurement process.Separate HSE risk assessment procedures conducted solely by specialists may lead to decoupling of the HSE considerations from the operational requirements. The objective was to integrate chemical HSE risk assessment into the overall consideration of chemical suitability (technical and cost) for a particular operation. When extending HSE risk assessment responsibility to operational staff with procurement responsibilities from HSE specialists, certain criteria must be met. The developed methodology was to meet the following targets:1. Give consistent answers without applying HSE expertise; 2. Be easy and fast to use; 3. Take into account regulative demands; and 4. Allow linking chemical HSE risk to management actions and corporate policy The developed methodology provides the assessor with a simple yet plausible and understandable result of the associated level of HSE risk. The assessment is based on linking data supplied by the vendors to chemical usage scenarios supplied by the actual operative personnel. Implementation of the methodology for easy user interface is based on an IT-solution tailored to the operators existing processes. This paper summarises the definition of the objectives and the main considerations taken when developing the methodology and presents an overview of the supporting tool developed.

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Section: Drivers For Systematic Hse Chemical Risk Assessmentsmentioning

confidence: 99%

Managing Chemical Risk at the Point of Procurement - Simple Tools for Efficient Chemical Risk Reduction

Gilbert¹,

Raahauge

Loughran

et al. 2008

All Days

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Petrophysical Evaluation of Deep Sandstone Gas-Bearing Reservoirs Using LWD Time-Independent Logs Paradigm

Fakolujo

Al-Belowi

Gzara

et al. 2014

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

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Formation evaluation can become complex when the invading mud-filtrate properties are unusual, variable or unknown like in sodium potassium (Na/K) formate water base mud (WBM) environments. In these situations, computed reservoir properties are adversely affected and become strongly dependent on the formation invasion status. The Permian age reservoir discussed in this paper, consists of highly unconsolidated heterogeneous sandstone sequences, saturated with condensate rich gas. From a drilling engineering perspective, the shales are often unstable, requiring high mud overbalance to maintain hole stability in wells with high inclinations, which resulted in recurrent differential sticking incidents. The use of formate based drilling fluids in this field, gained acceptance over time, primarily to minimize drilling problems. The downside of formate muds, however, is that log data interpretation encounters serious challenges because of the uncertain petrophysical properties of the mud, affecting log measurements in two ways. The first are those effects related to the mud present inside the borehole and surrounding the tool, or so-called environmental effects. The second are those related to the invading mud-filtrate present inside the formation, resulting in pessimistic porosity, mineralogy and permeability estimates. This paper shows how Na/K formate WBM filtrate effects can be identified and eliminated using Logging-While-Drilling (LWD) time-lapse data acquisition and analysis to provide time-independent logs in a manner that renders the logs immune to various mud-filtrate effects. These logs, together with a corresponding new petrophysical model, make it possible to do away with the mud-filtrate petrophysical properties, and to solve for porosity, mineralogy and fluid saturations from standalone nuclear measurements, irrespective of the formation invasion status. Moreover, the results demonstrate how valuable LWD time-lapse data acquisition can be, and that data acquired while drilling – especially resistivity data in this instance – are important to validate this novel formation evaluation interpretation approach.

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Formate Fluids and Environmental Regulations: A Global View of Benefits and Challenges

Cited by 2 publications

References 0 publications

Managing Chemical Risk at the Point of Procurement - Simple Tools for Efficient Chemical Risk Reduction

Managing Chemical Risk at the Point of Procurement - Simple Tools for Efficient Chemical Risk Reduction

Petrophysical Evaluation of Deep Sandstone Gas-Bearing Reservoirs Using LWD Time-Independent Logs Paradigm

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