In t roduc t ion The bulk of the steam a t the Geysers geothermal field is produced from fractures in a. relatively impermeable graywacke massif which has lieen heated by an underlying felsite intrusion. The largest of these fractures are steeply dipping right lateral strike-slip faults which are subparallel to the N W striking Clollayomi and Mercuryville faults which form t,lie NE and SW bound...

Exploration and development of the Nordegg in West Central Alberta is challenging because this prolific zone is deep, structured, and has low permeability. The reservoir is quite thick and is charged with gas. We know from core, samples, well log, and drilling data that the Nordegg zone is fractured to some degree. We expect this fracturing will affect the behavior of the Nordegg to our operati...

OBJECTIVES The principle of the intraosseous anesthesia (IOA) relies on the perforation of the cortical plate of the bone for direct application of the local anesthetic solution into the underlying cancellous structures. During this procedure, IOA needles might accidentally come in contact with the tooth roots. The aim of the current in vitro study was to examine the consequences of this 'worst...

Osteochondral lesions of the talus typically present as cartilage denudation after trauma or cystic in bone with intact cartilage. fractures require an anterograde approach for treatment. Retrograde drilling and packing a graft can treat Because subchondral involve posterior aspect talar dome, these be difficult to localize image intensifier. We describe method which ankle arthroscopy is used v...

Abstract: This article aims to study the effects of shock-disturbed cracks on the cutting features of cone bits. By utilizing the Walsh’s model, a crack model was established for the damaged rock surrounding the induced hole, the intrusive coefficient of the cone bit was derived, and the drilling rate equation around the induced hole was formulated. The effects of crack density and disturbance ...

We present an integrated study of multi-stage hydraulic fracture stimulation of two parallel horizontal wells in the Bakken formation in the Williston Basin, North Dakota. There are two distinct parts of this study: development of a geomechanical model for the study area, and analysis of the microseismic and hydraulic fracturing data. Despite the limited amount of well log data available, we es...

For the past three decades the quantity of petroleum (both oil and oil plus gas) found per foot of drilling effort in the United States for any given year can be expressed as a secular decrease of about 2 percent per year combined with an inverse function of drilling effort for that year. Extrapolation of energy costs and gains from petroleum drilling and extraction indicates that drilling for ...

this investigation presents the effect of various parameters on foam stability and its rheological properties. the underlying idea of this experiment is generating of drilling foam with uniform bubbles. the main problem of foam using is controlling its stability during field application. the most important parameters which cause instability in foam are gravity drainage, gas diffusion and bubble...

Abstract Natural fractures are not only the key to affect natural productivity of tight sandstone reservoirs but also one important factors control fracturing effect. If local strata affected by multistage tectonic movement and diagenesis, it will lead complexity fracture types characteristics, which makes difficult accurately identify fractures, thus, seriously development fractured In this pa...