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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Candidate Well Selection for the Test of Degradable Biopolymer as Fracturing Fluid

Hwang, Yun Suk 2011 December 1900 (has links)
Hydraulic fracturing is a well-established technology of generating highly conductive flow path inside the rock by injecting massive amount of fracturing fluid and proppant with sufficient pressure to break the formation apart. But as the concern for environment and health effects of hydraulic fracturing becomes intense, many efforts are made to replace the conventional fracturing fluid with more environment-friendly materials. The degradable biopolymer is one of the novel materials that is injected in the form of solid pellets containing proppant, degrades in the presence of water to form a viscous gel fluid, leaving no gel residue or harmful material. This work develops a methodology and computer program to determine the best candidate wells for the field test of degradable biopolymer as fracturing fluid. The unique properties of degradable biopolymer is captured in the selection of decision criteria such as bottomhole temperature and treatment volume as well as traditional hydraulic fracturing candidate well selection criteria such as formation permeability, productivity index.
2

Développement d’un dispositif médical anti-adhérentiel pour la prévention des synéchies intra-utérines. / Design of an anti-adhesive medical device for the prevention of intra-uterine synechiaes

Huberlant, Stéphanie 06 December 2016 (has links)
L'objectif de ce projet repose sur le développement d’un dispositif médical intra-utérin résorbable prévenant l’apparition ou la récidive d'adhérences intra-utérines (synéchies). La mise en place de ce dispositif suite à chaque agréssion endométriale représenterait un bénéfice symptômatique et économique dans la prise en charge de l’infertilité par trouble de l'implantation. Ce dispositif repose sur l'association originale de polymères résorbables mis sous forme de films stérilisés et maléables, répondants aux contraintes spécifiques de la voie endo-utérine. Des tests sur culture cellulaire ont permis de valider son potentiel anti-adhérentiel en retrouvant des résultats comparables à ceux d’agents barrières disponibles sur le marché. La dégradation in vitro et in vivo du polymère a été étudiée afin de valider un délai d’efficacité suffisant. Des travaux expérimentaux ont été conduits après accord des comités d’éthiques. D’une part, des tests de reproduction animale ont été menés afin de démontrer l’innocuité du dispositif et son efficacité sur la fertilité. D’autre part, des travaux ont permis de valider sur le plan histologique l’effet préventif sur les synéchies. Un travail de modélisation a permis d’adapter la forme du film pour la voie utérine. Les tests de déploiement ont été conduits sur des utérus de cadavre et sur des pièces d’hystérectomie. Après mise en place aisée par les voies naturelles, le dispositif se déploie et gonfle afin de recouvrir la cavité utérine. Des travaux précliniques pourraient être envisagés avant un développement industriel afin d’améliorer les outils disponibles pour la prévention des synéchies intra-utérines. / The objective of this study was to develop an resorbable intra-uterine medical device preventing the appearance or the recurrence of intra-uterine adhesions (synechiaes). The insertion of the device following each endometrial injury would represent a symptomatic and economic benefit in the treatment of infertility by implantation failure. This device is base on the unique combination of resorbables polymers formed into sterilized and malleable films, respondents to the specific constraints of the endo-uterine way. Cellular assays allowed validating the anti-adhesive effect with results comparable to those of currents agents available for the clinical practice. The in vitro and in vivo degradation of the polymer was study to validate a sufficient period of efficiency. The use of experimental models allowed an evaluation of the polymer. On one hand, tests of animal reproduction were lead to demonstrate the harmlessness of the device and the efficiency on the fertility. On the other hand, work has validated histologically preventive effect on synechiaes. Finally, a modeling work allowed adapting the form and dimension of the film for the human uterine way. Tests of deployment carried out on fresh uterus from hysterectomy. After the insertion by the cervical way, the device unfolds and inflates to cover the uterine cavity. Preclinical studies could be done before an industrial development in order to improve the available tools for the clinical prevention of the intra-uterine synechiaes.

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