The Bjelovar sub-depression is situated in the north-western part of Croatia, on southwestern margin Pannonian Basin System where favourable geothermal conditions exist. Thermal waters are used for recreation, balneotherapy, space heating, directly as sanitary water and electricity production. Geophysical, geological borehole data were to determine types reservoirs. In addition, several campaig...

The tiny sizes of pores and throats in shale gas reservoir increase the complexities flow mechanisms, which challenge accuracy current productivity models during optimization design prediction for multistage fractured horizontal wells (MFHWs). This paper established a model MFHWs with cased hole completion open completion. couples matrix, fractures, wellbore using potential superposition princi...

Some new analytical solutions for dimensionless pressure vs. dimensionless time are presented. It is deomonstrated how these new solutions, together with existing ones, can be used for unravelling reservoir heterogeneity patterns, quantitative interpretation of selected field tests, and well test design. The field tests cover both naturally fractured carbonates and layered sandstones. Two examp...

Many world class large carbonate reservoirs leave behind at least half of the initial oil in place. Typically water injection is used to improve oil recovery while gas injection is used to maintain pressure or to promote oil gravity drainage. Immiscible gas injection, including injection of CO2, has been considered but not implemented on a large scale for economic reasons. Furthermore, interest...

With proven reserves of 9.836 × 1010 m3, the largest known natural gas reservoir among terrigenous basement rocks has been discovered within granitoids northern Qaidam Basin. Due to their high heterogeneity, genesis reservoirs remains unknown. Herein, structure weathering crust in and potential controlling factors on development mechanism are discussed using a multidisciplinary approach based d...

The United Downs Deep Geothermal Project (UDDGP) is designed to utilize a presumably permeable steep dipping fault damage zone (constituting the hydrothermal reservoir in very low permeability granitic host rock) for fluid circulation and heat extraction between an injection well at 2.2 km depth (UD?2) production 5 (UD?1). Soft hydraulic stimulation was performed increase of reservoir. Numerica...

This paper was selected for presentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author(s). The material, as presented, does not necessarily reflect any position of the Society of Petroleum...

Hydraulic fracturing in shale gas reservoirs has usually resulted in complex fracture network. The results of micro-seismic monitoring showed that the nature and degree of fracture complexity must be clearly understood to optimize stimulation design and completion strategy. This is often called stimulated reservoir volume (SRV). In the oil & gas industry, stimulated reservoir volume has made th...