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Hydraulic fracturing, mechanism

Despite initial dolomite cementation, the central fractures remained planes of relative weakness and were subsequently reopened a number of times. Because of the surrounding intergranular cement, each dilation episode was followed by passive infill by finely crystalline dolomite, producing a complex symmetrically banded pattern. Precipitation is ascribed to the rapid diminution of pore pressure as dilation took place, and the resultant vein morphologies are typical of hydraulic fracture mechanisms. [Pg.432]

Valko, P. Economides, M.J. 1995. Hydraulic Fracture Mechanics. Wiley, New York. [Pg.648]

There are some rare situations where the gas turbine is used to power, through direct linkage, a mechanical unit, e.g., a hydraulic fracture pump. [Pg.400]

M. K. Hubbert and D. G. Willis. Mechanics of hydraulic fracturing. Transactions of AIME, 1957. [Pg.406]

Flow in undisturbed rock normally is radial toward a site of lower pressure (the wellbore). The fracture crack created by high pressure injection usually forms perpendicular to the least principle stress that exists in the rock. The induced fracture intersects and disrupts the radial flow pattern such that flow becomes linear and more direct to the well. This phenomenon has been intensively examined and discussed by authors working in the discipline of rock mechanics as applied to hydrocarbon reservoirs. Hydraulic fractures created in oil and gas wells grow mainly vertically, parallel to the wellbore as depicted in Figure 1 and extend on either side of the perforated wellbore as "wings11 (7-11). [Pg.63]

Buechley, T.C. and Lord, D.L. "Hydraulic Fracturing Fluid Mechanics State of the Art," Fluid Mechanics of Oil and Gas Production Symposium, 1973 National Meeting, A.I.Ch.E., New Orleans, March 11 15. [Pg.658]

Vandanme, L., Jeffrey, R.G. and Curran, J.H. "Effects of Three-Dimensionalization on a Hydraulic Fracture Pressure Profile," 1986 Proc. U.S. Sumposium on Rock Mechanics Key to Energy Production 580-590, Tuscaloosa, Alabama, June 23-25. [Pg.664]

Pyrak-Nolte, L. J., L. Myer, N. G. W. Cook, and P. A. Witherspoon, Hydraulic and mechanical properties of natural fractures in low permeability rock, Proc. Int. Cong. Im. Soc. R. Mechs., Montreal, 225-231, 1987. [Pg.70]

Abstract A methodology for quantifying the contributions of hydro-mechanical processes to fractured rock hydraulic property distributions has been developed and tested. Simulations have been carried out on discrete fracture networks to study the sensitivity of hydraulic properties to mechanical properties, stress changes with depth, mechanical boundary conditions, initial mechanical apertures and fracture network geometry. The results indicate that the most important (and uncertain) parameters for modelling HM processes in fractured rock are fracture density and rock/fracture mechanical properties. Aperture variation with depth below ground surface is found to be of second order importance. [Pg.231]

On the other hand, overlooking interactions may have severe consequences in modelling utility. For example, in hydropower tunnels hydraulic fracturing may be an issue (if the water pressures are high in relation to the rock stress), but the failure consequence would be overlooked unless this process were to be included in the description of the mechanical system (Stille et al., 2003). [Pg.435]

Even though the experimental results are still limited, it appears that the predicted occurrence conditions provide the general trend compatible with the experimental results. Thus, it may be possible to examine the fracture process to be expected for hydraulic stimulation in supercritical rock masses on the basis of the fracture mechanism map given in Fig. 4. The ratio of the minimum horizontal tectonic stress to the vertical tectonic stress usually falls in the range of 0.5-1.0 for brittle rock masses (Brace Kohlstedt, 1980.). The actual difference of the tectonic stresses may be significantly smaller in supercritical rock masses due to the high temperature creep deformation (Fournier, 1999 Muraoka et al., 20()0). If we limit... [Pg.663]

The principle radial compression has successfully solved the problems of packed-bed uniformity and of bed stability. However, radial compression has its Umitations in the strength of the partied If excessive radial compression is applied, and particles start to fracture, the homogeneity of the bed is lost. This sets an upper limit to the hydraulic compression that can be applied to soft or fragile particles. Since the column backpressure cannot exceed the compression pressure, this limits the applicability of hydraulic compression. Mechanical compression does not suffer from this problem, but it is more difficult to achieve a uniform compression, and therefore a good implementation of... [Pg.244]

At present, the equipment and field applications of pulsating hydraulic fracturing technology have been studied by many scholars, but there are still many shortages of the research on the mechanism of coal fatigue failure. Therefore, based on the damage... [Pg.897]

Zhang Y X. Song C S. 2010. Geostress Measurements by hydraulic fracturing method at great depth of boreholes and numerical modelling predictions of stress field. Chinese Journal of Rock Mechanics and Engineering, 29(4) 778-787. [Pg.1131]

Hubbert MK, Wilhs DG (1957) Mechanics of Hydraulic Fracturing. Trans AIME 210 153-168... [Pg.306]

The sequences of events that may lead to vessel failure and their frequencies are determined from probabilistic risk assessment (PRA) analyses. The pressure, temperature and heat transfer coefficient time histories at the vessel inner surface are determined from thermal hydraulic analyses for the events identified by the PRA analyses. These time histories are used together with probabilistic fracture mechanics (PFM) analysis to calculate the conditional probability of RPV failure. Discussion of the methodology used to perform the PRA analyses and define the transient events and associated frequencies, and the thermal hydraulic analyses used to define the event pressure and temperature time histories are outside the scope of this chapter. Consequently, the remainder of this chapter focuses on the PFM evaluation assumptions and procedures. [Pg.381]


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See also in sourсe #XX -- [ Pg.356 ]




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