Aquifer test methods have greatly improved in recent years with the advent of inverse analysis, derivative analysis, and diagnostic plots. Updated analyses of past aquifer tests allow for improved interpretations of the data to enhance the knowledge and the predictive capabilities of the flow system. This work thoroughly reanalyzes a series of preand post-hydraulic fracturing, single-well aquif...

• The 4.2 km deep Pohang PX-1 well was subject to hydraulic stimulation. Sulphate concentration and δ 34 S increase during post-stimulation flowback. Excess SO 4 2− demonstrates mineral dissolution Isotopes modelling indicate anhydrite as probable sulphate source. A stimulation carried out on a granodiorite reservoir in an enhanced geothermal system August 2017 Pohang, Korea. Water injected int...

Hydrocarbon production from unconventional resources and the use of reservoir stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that reservoir stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated reservoir with shallower freshwater aquifers, thus re...

Pulse hydraulic fracturing (PHF) is a key technique for reservoir stimulation. PHF can well accelerate the rupture of rock. However, supercharging mechanism not fully understood. The main reason that pressure distribution and its variation, especially peak characteristics, are unclear inside pipe fissure. present research focuses on sine pulse applied at inlet or fracture to reveal variation re...

Abstract. In 2018 and 2019, we performed STIMulation tests with characterising periodic pumping high-resolution seismic monitoring for improving prognosis models real-time TEChnologies the creation of hydraulic conduits in crystalline rocks (STIMTEC). The STIMTEC underground research laboratory is located at 130 m depth Reiche Zeche mine Freiberg, Germany. experiment was designed to investigate...

This paper documents our effort to use a fully coupled hydro-geomechanical numerical test bed to study using low hydraulic pressure to stimulate geothermal reservoirs with existing fracture network. In this low pressure stimulation strategy, fluid pressure is lower than the minimum in situ compressive stress, so the fractures are not completely open but permeability improvement can be achieved ...

Shale gas resources are abundantly distributed with low porosity and permeability. Horizontal well and fracturing are prior considerations. Fracturing is a widely-used technology to enhance gas production. In this paper, the author (a) investigated the present stimulation of Barnett and Haynesvile gas fields (Fig. 1) in America, Sichuan basin (Fig. 2) in China and Cooper basin (Fig. 3) in Austr...

Hydraulic fracturing enables hydrocarbon production from unconventional reservoirs. Mapping induced seismicity around newly created fractures is crucial for understanding the reservoir response and increasing efficiency of operations. Distributed acoustic sensing (DAS) provides a large amount high spatial resolution microseismic data acquired along entire length horizontal wells. We focus on ob...