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Rational approach to stress evaluation
369A 916303 Rational approach to stress evaluation Rao, J R; Prasad, K N Proc Indian Geotechaieal Conference, 1989, Geotechaiqnes of
Drilling
Problematic Soils and Rocks, Vlsakhapatnam, 14-16 December 1989 V1, P231-235. Publ New Delhi: Sarita Prakashan, 1989
916306 Drag and torque calculations for horizontal wells simplified for field use Wu, J; Juvkam-Wold, H C oil Gas J 1189, N17, 29 April 1991, P49-56
Historical approaches based on simplified assumptions with respect to soil properties and mechanisms of stress distribution are not adequate for many of today's engineering projects, and the finite element design method is becoming increasingly popular. A number of situations where it can be used are listed. The finite element method is used to assess stress distribution in a soil mass consisting of layers of different Young's modulus, Poisson's ratio, and unit weight, confined in a rigid box and loaded from the surface. Results are compared to those of the Boussinesq equation.
Design methods 916304 Interactive finite element mesh generation for three dimensional tunnd analysis Mertz, W G; Swoboda, G A Proc International Symposium on Computer and Physical Modelling in Geotechaieal Engineering, Bangkok, 3-6 December 1986 P253-265. Publ Rotterdam: A A Balkema, 1989
With the availability of powerful mini-computers, tunnel design engineers have changed from purely empirical design techniques to systems supported by numerical models. The development of a computer aided design system that helps the designer with the generation of a three dimensional finite element mesh is presented. The user can carry out tunnel lining and surrounding ground analysis. The mesh can be generated automatically without having to read each node individually.
Rock Breakage and Excavation Rock fracture under dynamic stresses 916305 Penetration of shaped charges in stressed rock Halleck, P M; Behrmann, L A Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P629-636. Publ Rotterdam: A A Balkema, 1990
Shaped charges, a special case of hypervelocity penetration in rocks, are used widely to perforate well casings and to a lesser extent in mining. Detonation results in generation of a jet of solid (powdered) metal with typical velocities of 7km/s and lkm/s at head and tail. Relations between rock strength and penetration tests are examined with reference to previous work, and experimental methods for their study are described. Empirical correlations of penetration with in situ measureable rock properties and with compressive strength, and the effects of confining pressure are discussed.
See also: 916067, 916455
Sliding drag and torque can increase dramatically for horizontal wells and become the limiting factors controlling the horizontal length of the well. A simplified set of equations is presented to calculate axial load, drag, and torque in the build section of a horizontal or extended reach well. These equations, which do not require numerical segment approximation, can be solved using a hand held calculator. 916307 Slim hole drilling - 1. Mining technique finds applications in oil exploration Deliac, E P; Messines, J P; Thieree, B A Oil Gas J V89, N18, 6 May 1991, P85-90
Equipment used by mining engineers for small diameter coring is finding applications in oil exploration. The slim hole (less than 21cm diameter) technology provides cores for the entire well and can produce cost savings of up to 30% compared to conventional oilfield rigs. Drill rig design, continuous coring rigs, drilling operations, mud hydraulics, drill rods, cementing, and core processing as used by Elf-Aquitaine are discussed. 916308 Slim hole drilling - conclusion. Well cored to 9,800ft in Paraguay Gunn, K B Oil Gas J 1189, N18, 13 May 1991, P51-55
A project to evaluate the geological aspects of the Parana basin and determine the applicability of slim hole core drilling equipment for oil exploration drilling is described. The basin is overlain by up to 1500m of basalt flows and there are many igneous intrusions and dykes in the sedimentary section. The techniques and equipment used are outlined and progress through each section discussed. The hole was completed at an average rate of 24m/day and overall core recovery was 99.4%. 916309 Application of a lime-based drilling fluid in a hightemperature/high-pressure environment Elsen, J M; Mixon, A M; Broussard, M D; LaHue, D R SPE Drilling Engng V6, N1, March 1991, P51-56
Lime based drilling fluids are used where solids tolerance, low and stable rheology, contaminant resistance, and inhibition to shales are required. Recent developments in additives and solids control equipment have allowed these muds to be used at temperatures above 150 deg C without excessive gelification. Formulation and development for offset wells offshore of Texas, where temperatures above 175 deg C and carbon dioxide and salt environments are found, are described. 916310 Case history: ice island drilling application and well considerations in Alaskan Beaufort Sea Angell, V W; Graham, H J; Post, G J SPE Drilling Engng V6, N1, March 1991, P60-64
A spray ice island was constructed to drill the Karluk prospect during winter 1988-1989. The drilling program was that of a typical Arctic land exploration with some modifications to accommodate the ice island. A 760mm diameter casing was
© 1991 Pergamon Press plc. Reproduction not permitted
Drilling
Problematic Soils and Rocks, Vlsakhapatnam, 14-16 December 1989 V1, P231-235. Publ New Delhi: Sarita Prakashan, 1989
916306 Drag and torque calculations for horizontal wells simplified for field use Wu, J; Juvkam-Wold, H C oil Gas J 1189, N17, 29 April 1991, P49-56
Historical approaches based on simplified assumptions with respect to soil properties and mechanisms of stress distribution are not adequate for many of today's engineering projects, and the finite element design method is becoming increasingly popular. A number of situations where it can be used are listed. The finite element method is used to assess stress distribution in a soil mass consisting of layers of different Young's modulus, Poisson's ratio, and unit weight, confined in a rigid box and loaded from the surface. Results are compared to those of the Boussinesq equation.
Design methods 916304 Interactive finite element mesh generation for three dimensional tunnd analysis Mertz, W G; Swoboda, G A Proc International Symposium on Computer and Physical Modelling in Geotechaieal Engineering, Bangkok, 3-6 December 1986 P253-265. Publ Rotterdam: A A Balkema, 1989
With the availability of powerful mini-computers, tunnel design engineers have changed from purely empirical design techniques to systems supported by numerical models. The development of a computer aided design system that helps the designer with the generation of a three dimensional finite element mesh is presented. The user can carry out tunnel lining and surrounding ground analysis. The mesh can be generated automatically without having to read each node individually.
Rock Breakage and Excavation Rock fracture under dynamic stresses 916305 Penetration of shaped charges in stressed rock Halleck, P M; Behrmann, L A Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P629-636. Publ Rotterdam: A A Balkema, 1990
Shaped charges, a special case of hypervelocity penetration in rocks, are used widely to perforate well casings and to a lesser extent in mining. Detonation results in generation of a jet of solid (powdered) metal with typical velocities of 7km/s and lkm/s at head and tail. Relations between rock strength and penetration tests are examined with reference to previous work, and experimental methods for their study are described. Empirical correlations of penetration with in situ measureable rock properties and with compressive strength, and the effects of confining pressure are discussed.
See also: 916067, 916455
Sliding drag and torque can increase dramatically for horizontal wells and become the limiting factors controlling the horizontal length of the well. A simplified set of equations is presented to calculate axial load, drag, and torque in the build section of a horizontal or extended reach well. These equations, which do not require numerical segment approximation, can be solved using a hand held calculator. 916307 Slim hole drilling - 1. Mining technique finds applications in oil exploration Deliac, E P; Messines, J P; Thieree, B A Oil Gas J V89, N18, 6 May 1991, P85-90
Equipment used by mining engineers for small diameter coring is finding applications in oil exploration. The slim hole (less than 21cm diameter) technology provides cores for the entire well and can produce cost savings of up to 30% compared to conventional oilfield rigs. Drill rig design, continuous coring rigs, drilling operations, mud hydraulics, drill rods, cementing, and core processing as used by Elf-Aquitaine are discussed. 916308 Slim hole drilling - conclusion. Well cored to 9,800ft in Paraguay Gunn, K B Oil Gas J 1189, N18, 13 May 1991, P51-55
A project to evaluate the geological aspects of the Parana basin and determine the applicability of slim hole core drilling equipment for oil exploration drilling is described. The basin is overlain by up to 1500m of basalt flows and there are many igneous intrusions and dykes in the sedimentary section. The techniques and equipment used are outlined and progress through each section discussed. The hole was completed at an average rate of 24m/day and overall core recovery was 99.4%. 916309 Application of a lime-based drilling fluid in a hightemperature/high-pressure environment Elsen, J M; Mixon, A M; Broussard, M D; LaHue, D R SPE Drilling Engng V6, N1, March 1991, P51-56
Lime based drilling fluids are used where solids tolerance, low and stable rheology, contaminant resistance, and inhibition to shales are required. Recent developments in additives and solids control equipment have allowed these muds to be used at temperatures above 150 deg C without excessive gelification. Formulation and development for offset wells offshore of Texas, where temperatures above 175 deg C and carbon dioxide and salt environments are found, are described. 916310 Case history: ice island drilling application and well considerations in Alaskan Beaufort Sea Angell, V W; Graham, H J; Post, G J SPE Drilling Engng V6, N1, March 1991, P60-64
A spray ice island was constructed to drill the Karluk prospect during winter 1988-1989. The drilling program was that of a typical Arctic land exploration with some modifications to accommodate the ice island. A 760mm diameter casing was
© 1991 Pergamon Press plc. Reproduction not permitted