scholarly journals Technical challenges and solutions in a closed loop MEG regeneration system for gas field offshore, UK

2013 ◽  
Author(s):  
S. Baraka-Lokmane ◽  
Ch. Hurtevent ◽  
M. Seiersten ◽  
E. Flaten ◽  
M. Farrell ◽  
...  
Keyword(s):  
Closed Loop ◽  
Regeneration System ◽  
Gas Field ◽  
Technical Challenges

scholarly journals Closed-loop neuromodulation will increase the utility of mouse models in Bioelectronic Medicine

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Timir Datta-Chaudhuri
Keyword(s):  
Mouse Models ◽  
Recent Progress ◽  
Closed Loop ◽  
Medical Science ◽  
Implantable Devices ◽  
Chronic Stimulation ◽  
Medicine Research ◽  
Bioelectronic Medicine ◽  
The Future ◽  
Technical Challenges

AbstractMouse models have been of tremendous benefit to medical science for the better part of a century, yet bioelectronic medicine research using mice has been limited to mostly acute studies because of a lack of tools for chronic stimulation and sensing. A wireless neuromodulation platform small enough for implantation in mice will significantly increase the utility of mouse models in bioelectronic medicine. This perspective examines the necessary functionality of such a system and the technical challenges needed to be overcome for its development. Recent progress is examined and the outlook for the future of implantable devices for mice is discussed.

scholarly journals OIL AND GAS FIELD DEVELOPMENT MANAGEMENT IN A CLOSED LOOP

2018 ◽  
Author(s):  
E.S. Zakirov ◽  
S.N. Zakirov ◽  
I.M. Indrupskiy ◽  
O.V. Lubimova ◽  
D.P. Anikeev ◽  
...  
Keyword(s):  
Closed Loop ◽  
Oil And Gas ◽  
Gas Field ◽  
Field Development ◽  
Development Management ◽  
Oil And Gas Field

Oil and gas field economic evaluation optimization method: Closed loop approach for CO2 flooding

2020 ◽  
Author(s):  
Prasandi Abdul Aziz ◽  
Tutuka Ariadji ◽  
Wijoyo Niti Daton ◽  
Arif Somawijaya ◽  
Kharisma Idea
Keyword(s):  
Economic Evaluation ◽  
Closed Loop ◽  
Oil And Gas ◽  
Optimization Method ◽  
Co2 Flooding ◽  
Gas Field ◽  
Oil And Gas Field

scholarly journals Technical Challenges and Clinical Outcomes of Using a Closed-Loop Glycemic Control System in the Hospital

2013 ◽  
Vol 7 (1) ◽  
pp. 238-246 ◽  
Author(s):  
Takehiro Okabayashi ◽  
Akihito Kozuki ◽  
Tatsuaki Sumiyoshi ◽  
Yasuo Shima
Keyword(s):  
Control System ◽  
Glycemic Control ◽  
Clinical Outcomes ◽  
Closed Loop ◽  
Technical Challenges

Evaluation and application of calcite scale inhibitor in an offshore pH stabilised MEG system—an Australian first

2015 ◽  
Vol 55 (1) ◽  
pp. 247 ◽  
Author(s):  
Farrell Backus ◽  
Evan Harvey ◽  
Mike Gunn
Keyword(s):  
Production System ◽  
Closed Loop ◽  
Regeneration Process ◽  
Water Production ◽  
Formation Water ◽  
Critical Component ◽  
Scale Inhibitor ◽  
Regeneration System ◽  
Reduced Frequency ◽  
Harsh Conditions

Calcite scale mitigation in pH stabilised MEG systems is a growing concern for the industry as a number of systems are planned for upcoming Australian gas projects. Issues are insignificant at first gas when water of condensation is present. When formation water production occurs, scale management becomes a critical component of project feasibility. A closed loop pH stabilised MEG regeneration system located in the Otway Basin faced these challenges. Severe calcite scaling in a subsea well, which led to choke failure and MEG system fouling, was successfully controlled by the application of a specific polymeric scale inhibitor. The operating nature of a pH stabilised closed loop MEG system eliminates conventional scale inhibitor chemistries. Customised polymer chemistries were selected for review predominately due to their ability to persist in a variety of harsh conditions, including the MEG regeneration process. Technical qualification to validate scale inhibitor functionality was completed using protracted compatibility testing and Dynamic Scale Loop assessment. Evaluation of inhibitor performance and behaviour was accomplished using customised monitoring processes focusing on scale inhibitor detection, identifying measurement interferences, and interaction with precipitated solids. Field implementation provided excellent results with the inhibitor averting further severe scaling issues, resulting in minimal production system disruption. Fouling of the MEG regeneration system in particular has been minimised, resulting in a reduced frequency and length of cleaning cycles. This peer-reviewed paper will detail the evaluation, application and monitoring fundamentals when introducing scale inhibitors into pH stabilised MEG systems.

Closed Loop Nitrified Foam MPD Delivers Unprecedented Drilling Performance in a Mature Sour Gas Field in Pakistan

2021 ◽  
Author(s):  
Ali Khalid ◽  
Qasim Ashraf ◽  
Khurram Luqman ◽  
Ayoub Hadj-Moussa ◽  
Agha Ghulam Nabi ◽  
...  
Keyword(s):  
Closed Loop ◽  
Oil And Gas ◽  
High Rate ◽  
Gas Field ◽  
Lost Circulation ◽  
Drilling Performance ◽  
Fractured Limestone ◽  
Productive Time ◽  
Equipment System ◽  
Sour Gas

Abstract As oil and gas reserves mature the world over, operators are looking towards advanced methods of increasing the ultimate recovery from their ageing fields. An energy deficient country of Pakistan relies heavily on oil and gas imports. The country was once self sustaining in at least natural gas needs. A major portion of this gas was produced from the Field-X which was discovered in the 1950’s. The primary reservoir in Field-X is the YZ-Limestone reservoir which bears sour gas. Due to extensive production from the YZ-Limestone formation, the reservoir pressure has depleted to a mere 2.0 PPG in equivalent mud weight, and it being a naturally fractured limestone formation presents numerous drilling challenges. The operator has evaluated a potential higher pressured formation in the deeper horizons of sui field but that requires drilling through approximately 650-690 meters of the YZ-Limestone formation. This feat when attempted conventionally is plagued with numerous problems like, total lost circulation, differential sticking, influxes due to the loss of a sufficient hydrostatic head, and stuck pipe following well control events. To mitigate these challenges the operator, need an effective method to drill through this depleted formation without pumping heavy LCM pills, and multiple cement plugs across the massive cavernous thief zones in the YZ-Limestone formation which could have been detrimental to the production of nearby wells. Moreover, such remedies with specialized LCM’s and acid soluble plugs would have resulted in excessive material cost and non-productive time, which in some instances extended to a period of more than a month. To address the aforementioned challenges in drilling the YZ-Limestone formation, a multiphase managed pressure drilling system was suggested to drill the formation with minimal non-productive time and cost. Multiphase hydraulics were performed to assess appropriate pumping parameters for a near-balanced condition across the YZ-Limestone formation. A closed loop MPD equipment system was designed to help maintain near-balanced conditions in pumping and static (non-circulating) periods. The designed equipment system would also ensure that the risk of H2S exposure to the atmosphere was eliminated. The application of a closed loop nitrified mpd system on a recently drilled well proved to be highly successful and reduced the drilling time to just 28 hours by not only eliminating fluid lost circulation but by also delivering an extremely high rate of penetration of 39.2 m/hr. The successful and exemplary application of nitrified MPD has opened up a new horizon for the development of deeper prospects in the Field-X and similar neighboring fields. The paper outlines the design and execution of the closed loop nitrified MPD system.

Intestinal Bacteriology of Closed Loop, Strangulated Obstruction in Dogs.

1961 ◽  
Vol 41 (3) ◽  
pp. 245-250 ◽  
Author(s):  
George H. Bornside ◽  
Isidore Cohn
Keyword(s):  
Closed Loop
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