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Glenat P.,Total Exploration and Prod. | Glenat P.,French Institute of Petroleum | Dang F.,Total Exploration and Prod. | Dang F.,French Institute of Petroleum | And 4 more authors.
21st TEKNA International Oil Field Chemistry Symposium (Oslo, Norway, 3/15-17/2010) Proceedings | Year: 2010

In oil industry, drag reducing agents (DRA) are used to reduce significantly the frictional pressure loss of transported crude oils, allowing a substantial increase in pipeline capacity. They are generally composed of long-chain polymers both flexible and oil soluble. Although diluted in light petroleum cuts, heavy crude oils could represent a challenge for DRA application. First, their high viscosity shifts the Reynolds number to moderate values and limits turbulence. Secondly, it involves the use of a high pipeline diameter to guarantee a minimum flow rate, which diminishes the displayed wall shear stress. An experimental work was carried out showing how some special polymers can succeed in involving drag reduction for heavy oil transportation. Results suggest that polymers having a coil-stretch transition at lower shear stress should be more efficient. This study is based on the combined use of a classical rheometer and a specially designed laboratory turbulent flow loop offering a large range of experimental conditions in terms of temperature, pressure and flow rates. Different commercial oil soluble DRAs were tested on various diluted heavy crude oils containing either colloidal or flocculated asphaltenes. Results show that in some cases, drag reduction can be easily and effectively applied to heavy oil transportation.

Alboussiere M.C.,Total Exploration and Prod. | Cailleaud K.,Total Exploration and Prod.
SPE Health, Safety, and Environment International Conference (Long Beach, CA, 3/17-19/2014) Proceedings 2014 | Year: 2014

The oil and gas industry is committed to provide accurate impact assessment of its activity on the surrounding environment. To achieve this, extensive environmental monitoring needs to be performed on a regular basis around offshore installations. Many tools and techniques have been developed to meet that request. But monitoring trace hydrocarbons in seawater remains challenging. Standard methods require sampling of huge seawater volumes, and are limited in terms of deployment flexibility and detection threshold for very low levels of contaminants. Due to variability over time, spot sampling is also questioned. Passive samplers have been identified as a promising technique which could provide a number of analytical and practical advantages on standard techniques. However, challenges still remain to apply the technique to marine environment. Additional research was therefore carried out to ensure validity of the tool for offshore use and total dissolved hydrocarbons monitoring. This paper presents the results of the work conducted to characterize passive sampler operating conditions and hydrocarbon uptake as a function of in situ concentration.

Rambeau O.,Total Exploration and Prod. | Jacob M.,Total Exploration and Prod. | Rondon M.,Total Exploration and Prod. | Jouenne S.,Total Exploration and Prod. | Cordelier P.,Total Exploration and Prod.
International Petroleum Technology Conference [IPTC] (Doha, Qatar, 1/19-22/2014) Proceedings | Year: 2014

When the enhanced oil recovery (EOR) process involves a polymer injection, both surfactants and polymer are expected to be produced with production fluid at different ratios. This means changes of miscibility of fluids vs. time, leading to some challenges with regard to the process and its flexibility against time. Depending on the start up of the EOR production through field life, more water treatment difficulties would have to be managed compared to separation issues; otherwise, the efficiency of both water treatment and separation could be partially lost. This paper focuses on water treatment technologies assessment regarding inlet characteristics of produced water in the presence of HPAM polymer back production. Technologies to be tested have been chosen to tackle expected thinner oil droplets in water emulsion. To achieve water quality (oil and solids contents) targets for re-injection, filtration and centrifugation have been assessed through lab bench screening. A pilot scale has been designed, a platform of tests has been built to help projects better design their process, and subsidiaries optimize existing processes.

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