Due to fracture interference, not all perforations can be fractured, resulting in 20% of fractures contributing 80% the total production. The extraction oil and gas also reduces production, necessitating refracturing. In this study, finite element method was used simulate multiple fracturing simultaneously stress field distribution then extracted applied a new geological model. This paper expla...

BACKGROUND Horizontal root fractures are rare in comparison to other types of injuries and according to the literature account for between 0.2%?7% of all traumatic tooth injuries. CASE REPORTS Case 1: A 12-year-old girl was referred to our clinic with a complaint of tenderness and mobility as a result of an orofacial injury in her permanent upper left central incisor. A horizontal fracture wa...

OBJECTIVES The aim of the present investigation was to study the influence of a reduced bone support on the fracture resistance of endodontically treated teeth restored with glass fibre-reinforced posts (FRC). METHODS 30 caries-free maxillary central incisors were divided into 3 groups (n=10). Endodontic treatment was performed. Teeth were flattened 2 mm above the cemento-enamel junction. Gro...

Multi-stage hydraulic fracturing of horizontal wells is the main stimulation method in recovering gas from tight shale gas reservoirs, and stage spacing determination is one of the key issues in fracturing design. The initiation and propagation of hydraulic fractures will cause stress redistribution and may activate natural fractures in the reservoir. Due to the limitation of the analytical met...

E10 J can chir, Vol. 52, N 1, février 2009 © 2009 Association médicale canadienne I ntra-articular fractures of the metacarpal head are rare, often requiring surgical fixation to maintain articular congruence. McElfresh and Dobyns presented a 10-group classification of 103 such fractures based on anatomic involvement and fracture pattern (Table 1). They identified only 4 with a horizontal fract...

This case study reports the successful outcome of horizontal root fractures of two different patients, which took place in permanent incisors. Report 1 describes a case of a 29-year-old patient who suffered a mandibular trauma affecting mainly the lower central incisors, caused by a car accident. A panoramic radiograph was taken right after the accident and showed a horizontal root fracture in ...

most of the earth's crust contains fluids, and fractures are common throughout the upper part. they exist at a wide range of scales from micro-fractures within grains to major faults and shear zones that traverse the crust. in this paper, the stress-dependent permeability in fractured rock masses have been investigated considering the effects of nonlinear normal deformation and shear dilation o...

in this work, studies of underground gas storage (ugs) were performed on a partially depleted, naturally fractured gas reservoir through compositional simulation. reservoir dynamic model was calibrated by history matching of about 20 years of researvoir production. effects of fracture parameters, i.e. fracture shape factor, fracture permeability and porosity were studied. results showed that di...