IEEE Xplore
Doing Her Bit In War-Time. Press Cuttings: General. Supplementary Material. 1917. SUPP. 45/168. Book.
1917 - Gale Group | ArchivesUnbound Women-War
... has been no overall method of designing jet-bit programs that efficiently uses the surface power. A ... per cent of the possible effects at the bit are used. Some observers have indicated that the ... maximum effect on drilling rate) occurs when the bit hydraulic horsepower is maximum; others have stated that ... to date have shown some optimum conditions for bit hydraulic horsepower and impact, but these conditions cannot ... provide a basis for designing a complete jet-bit program. This paper shows the maximum obtainable bit ...
Tópico(s): Hydraulic Fracturing and Reservoir Analysis
1960 - | Transactions of the AIME
Leaflet: Do your bit now. Navy League, Ladies Emergency Committee London Branch, Bristol Branch. Benevolent Organisations. B.O.6 3.2/5. Book.
0000 - Gale Group | ArchivesUnbound Women-War
David S. Rowley, Richard J. Howe, F.H. Deily,
... with 4 3/4-in. hard-formation rock bits were made under rock pressure and borehole fluid ... a 3,000-ft borehole. The effects of bit weight and rotary speed on drilling rate and bit rotary power were determined in a hard, impermeable dolomite. With added bit weight, the drilling rate and rotary power both ... drilling rate and rotary power were obtained and bit mechanical efficiency was calculated. Introduction During the past ... of tests using roller cone, drag and diamond bits varying in size from 3 3/4 to ...
Tópico(s): Hydraulic Fracturing and Reservoir Analysis
1961 - Society of Petroleum Engineers | Journal of Petroleum Technology
Booklet. Soldiers' Club Association A bit of home. Soldiers' Clubs Association. Benevolent Organisations. B.O.4 3/12. Book.
0000 - Gale Group | ArchivesUnbound Women-War
R. M. Feenstra, J.J.M. Van Leeuwen,
Abstract The effect of jets on bit penetration has been investigated by means of a 50-ton drilling machine and 8 1/2 -in. commercial jet bits, drilling under representative bottomhole conditions. The conclusions apply ... obtained at medium-high jet power. At high bit load, penetration by soft to medium- hard-formation bits is further hampered by bit-balling. Its alleviation requires intensive tooth scavenging, which ... improve by a 100 per cent. At high bit load, bottom-balling limits the penetration of insert- ...
Tópico(s): Oil and Gas Production Techniques
1964 - Society of Petroleum Engineers | Journal of Petroleum Technology
Report: My British Bit, about the work done by Mrs Cambie. Portsmouth. Local Records. L.R. 321/4. Book.
0000 - Gale Group | ArchivesUnbound Women-War
... clean the bottom of a borehole during jet-bit drilling operations. One is an impact-pressure wave ... beneath a 4 3/4-in. tricone jet bit in a laboratory model show that the maximum ... under conditions other than those in the jet-bit model may be made by comparison with a ... the borehole will impede further penetration by the bit until they are removed. Wasteful regrinding is prevented if the fluid circulated past the bit removes cuttings as rapidly as they are made. Most investigations of bottom-hole cleaning under bits have been concerned with the rate-of-penetration ...
Tópico(s): Reservoir Engineering and Simulation Methods
1964 - Society of Petroleum Engineers | Journal of Petroleum Technology
Springer Link
Xanthus Smith, W. H. Harrison, A. E. Maris, G. Cramer, Wm. H. Seaman, J. Focus Snappschotte,
... and Phonograph in the Study of Ethnology, A Bit of Mt. Desert Coast, Expression of Formulæ in ...
1890 - Gale Group | NCCO Photography
... and shear in crossflow beneath three-cone jet bits may influence cleaning of the bottom of the borehole and the teeth of the bit. Laboratory investigation shows that each of these parameters ... In drilling operations using conventional jet-type rock bits, the impinging jets create an important flow mechanism. ... of energy to clean the teeth of the bit and most of the bottom. Besides providing the means of cleaning cuttings from the bit and the hole bottom, crossflow may also have ... QVn produces the maximum cleaning beneath current jet bits is unchanged by these new data; rather, it ...
Tópico(s): Reservoir Engineering and Simulation Methods
1965 - Society of Petroleum Engineers | Journal of Petroleum Technology
Leaflet: A bright home and a bit of land. County Homestead Association. Benevolent Organisations. B.O.8 11/4. Book.
0000 - Gale Group | ArchivesUnbound Women-War
... what factors affect the penetration rate of roller bits, diamond bits and drag bits in rock drilling with clay/water muds. The ... together fully account for operating, rock, mud and bit variables. In impermeable rock a similar pressure differential is caused by the bit action itself. In all cases, the pressure differential ... bottom of the hole by mud particles. Where bits are employed whose action is largely that of ... into the pores of the rock. With roller bits, a plastically behaving layer may be formed, which ...
Tópico(s): Oil and Gas Production Techniques
1962 - Society of Petroleum Engineers | Journal of Petroleum Technology
Women "doing their bit". Press Cuttings: Women In Munitions Work. Supplementary Material. 1915-1917. SUPP. 30/47. Book.
1915 - Gale Group | ArchivesUnbound Women-War
... with a 1 1/4-in. diameter roller bit were performed on Berea and Bandera sandstones and ... Mud filtrate was constrained to flow beneath the bit; no filtrate flowed radial through the borehole wall. ... pressure at three different locations ahead of the bit, cumulative filtrate volume, borehole pressure and bit location were monitored during drilling. The rock samples. ... permeability damage and pore pressure gradients beneath the bit were evaluated. The importance of borehole-to-formation ... penetration rate through particle invasion ahead of the bit, which damage leads to high pressure gradients. Penetration ...
Tópico(s): Hydraulic Fracturing and Reservoir Analysis
1967 - Society of Petroleum Engineers | Journal of Petroleum Technology
The M-L Magneto: A Bit of History. Press Cuttings: Women In Munitions Work. Supplementary Material. 1918-1919. SUPP. 31/123. Book.
1918 - Gale Group | ArchivesUnbound Women-War
... Cu ground plane with 0.004-in.-wide bit lines on 0.006-in. centers and 0. ... an unusually high packing density of 12 000 bits/in.2 A sense signal of 2 mV ... word current (6 nsec risetime) and 15-mA bit current. The low word and bit currents have been achieved by miniaturizing the devices ... providing flux closures. The etched Permalloy-Cu-Permalloy bit/sense lines are plated with Permalloy at the ... be extended by using doublet word and/or bit currents. The doublet bit current increases the bit disturb threshold, while the ...
Tópico(s): Thin-Film Transistor Technologies
1967 - American Institute of Physics | Journal of Applied Physics
Photograph with a view of the gorge at the village of Deh Mazang or Mozang on the Ghazni road just outside Kabul in Afghanistan, taken by John Burke in ...
0000 - Gale Group | NCCO Photography
... of the drilling performance of surface set diamond bits has been developed. The analysis is based on ... specified drilling conditions and rock formation, expressions for bit torque and bit weight are obtained in terms of bit penetration rate. Expressions also are obtained for the ... vary considerably over the cutting surface of the bit. Theoretical results are compared with experimental results for full hole bits and core bits. The agreement is reasonable. Introduction A theoretical analysis ... the drilling performance of a surface set diamond bit, since the over-all performance is determined by ...
Tópico(s): Geotechnical and Geomechanical Engineering
1969 - Society of Petroleum Engineers | Society of Petroleum Engineers Journal
Project Gutenberg
Photograph showing the sheer walls of the very narrow Jagdalak defile in Afghanistan, taken by John Burke in 1879-80. The Jagdalak Pass, situated between ...
0000 - Gale Group | NCCO Photography
An on-site computer system to control bit weight and rotary speed has been developed and successfully installed on a South Louisiana well. Early field tests indicate that the system could ... data and empirical prediction techniques for selecting optimum bit weight and rotary speed. Past solutions have required ... developed an on-site computer system to control bit weight and rotary speed and thereby implement the ... to solve minimum-cost drilling formulas, and control bit weight and rotary speed in accordance with these ...
Tópico(s): Oil and Gas Production Techniques
1969 - Society of Petroleum Engineers | Journal of Petroleum Technology