scholarly journals Development and Testing of a Jet Assisted Polycrystalline Diamond Drilling Bit. Phase II Development Efforts

1999 ◽  
Author(s):  
David S. Pixton
Keyword(s):  
Phase Ii ◽  
Polycrystalline Diamond ◽  
Diamond Drilling ◽  
Drilling Bit

Research on Embedding Strength of Diamond

2011 ◽  
Vol 480-481 ◽  
pp. 560-567
Author(s):  
Jun De Yang ◽  
Zhong Ping Luo ◽  
Fan Lu ◽  
Yuan Wang
Keyword(s):  
Tungsten Carbide ◽  
Diamond Drill ◽  
Diamond Drilling ◽  
Drill Bits ◽  
Matrix Surface ◽  
The Matrix ◽  
Diamond Saw ◽  
The Cost ◽  
Diamond Saw Blades ◽  
Drilling Bit

It is stated that Diamond saw blades requires high embedding strength of the diamond, while diamond drill bits do not. It is necessary to improve the embedding strength of diamond in diamond saw blades, rather than in the diamond drilling bits. It is recommended to count the number of diamond particles on the matrix surface and get the embedding strength of diamond by calculation. Another recommendation is to use the compound powder of cobalt and tungsten carbide for pelletizing in order to improve the embedding strength of diamond and lower the cost of matrix. There are people studying how to raise embedding strength of diamond, for both diamond saw blades and diamond drilling bit. However, the requirements for embedding strength of diamond saw blades and diamond drilling bit are different. The following parts include the analysis for this problem.

scholarly journals Numerical modeling on drilling fluid and cutter design effect on drilling bit cutter thermal wear and breakdown

2019 ◽  
Vol 10 (3) ◽  
pp. 959-968
Author(s):  
Ahmad Zhafran Ayop ◽  
Ahmad Zafri Bahruddin ◽  
Belladonna Maulianda ◽  
Aruvin Prakasan ◽  
Shamammet Dovletov ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Polycrystalline Diamond ◽  
Poor Performance ◽  
Drilling Fluids ◽  
Drill Bit ◽  
Thermal Wear ◽  
Cutter Design ◽  
Low Performance ◽  
Geological Complexity ◽  
Drilling Bit

Abstract The unconventional reservoir geological complexity will reduce the drilling bit performance. The drill bit poor performance was the reduction in rate of penetration (ROP) due to bit balling and worn cutter and downhole vibrations that led to polycrystalline diamond compact (PDC) cutter to break prematurely. These poor performances were caused by drilling the transitional formations (interbedded formations) that could create huge imbalance of forces, causing downhole vibration which led to PDC cutter breakage and thermal wear. These consequently caused worn cutter which lowered the ROP. This low performance required necessary improvements in drill bit cutter design. This research investigates thermal–mechanical wear of three specific PDC cutters: standard chamfered, ax, and stinger on the application of heat flux and cooling effect by different drilling fluids by using FEM. Based on simulation results, the best combination to be used was chamfered cutter geometry with OBM or stinger cutter geometry with SBM. Modeling studies require experimental validation of the results.

Comparative analysis of tangentially laser-processed fluted polycrystalline diamond drilling tools

2016 ◽  
Vol 23 ◽  
pp. 157-164 ◽  
Author(s):  
M. Warhanek ◽  
C. Walter ◽  
M. Hirschi ◽  
J. Boos ◽  
J.F. Bucourt ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Polycrystalline Diamond ◽  
Diamond Drilling ◽  
Drilling Tools

Characterization of homoepitaxial diamond films by Electron microscopy

1991 ◽  
Vol 49 ◽  
pp. 880-881
Author(s):  
D.P. Malta ◽  
S.A. Willard ◽  
R.A. Rudder ◽  
G.C. Hudson ◽  
J.B. Posthill ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Surface Defects ◽  
Substrate Surface ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Large Degree ◽  
Rf Plasma ◽  
Semiconducting Diamond

Semiconducting diamond films have the potential for use as a material in which to build active electronic devices capable of operating at high temperatures or in high radiation environments. A major goal of current device-related diamond research is to achieve a high quality epitaxial film on an inexpensive, readily available, non-native substrate. One step in the process of achieving this goal is understanding the nucleation and growth processes of diamond films on diamond substrates. Electron microscopy has already proven invaluable for assessing polycrystalline diamond films grown on nonnative surfaces.The quality of the grown diamond film depends on several factors, one of which is the quality of the diamond substrate. Substrates commercially available today have often been found to have scratched surfaces resulting from the polishing process (Fig. 1a). Electron beam-induced current (EBIC) imaging shows that electrically active sub-surface defects can be present to a large degree (Fig. 1c). Growth of homoepitaxial diamond films by rf plasma-enhanced chemical vapor deposition (PECVD) has been found to planarize the scratched substrate surface (Fig. 1b).

Microstructural Study of Diamond Deformed Under High Pressure and Temperature

1985 ◽  
Vol 43 ◽  
pp. 230-231
Author(s):  
E. F. Koch
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Lattice Structure ◽  
Diamond Particle ◽  
Polycrystalline Diamond ◽  
Sintering Process ◽  
Ion Milling ◽  
Sintered Compact ◽  
Transmission Electron ◽  
High Pressure Sintering

Because of the extremely rigid lattice structure of diamond, generating new dislocations or moving existing dislocations in diamond by applying mechanical stress at ambient temperature is very difficult. Analysis of portions of diamonds deformed under bending stress at elevated temperature has shown that diamond deforms plastically under suitable conditions and that its primary slip systems are on the ﹛111﹜ planes. Plastic deformation in diamond is more commonly observed during the high temperature - high pressure sintering process used to make diamond compacts. The pressure and temperature conditions in the sintering presses are sufficiently high that many diamond grains in the sintered compact show deformed microtructures.In this report commercially available polycrystalline diamond discs for rock cutting applications were analyzed to study the deformation substructures in the diamond grains using transmission electron microscopy. An individual diamond particle can be plastically deformed in a high pressure apparatus at high temperature, but it is nearly impossible to prepare such a particle for TEM observation, since any medium in which the diamond is mounted wears away faster than the diamond during ion milling and the diamond is lost.

Phase II study of safety, efficacy and pharmacokinetics of BXT-51072 in patients with mild-moderately active ulcerative colitis

2001 ◽  
Vol 120 (5) ◽  
pp. A280-A280
Author(s):  
S HANAUER ◽  
P MINER ◽  
A KESHAVARZIAN ◽  
E MORRIS ◽  
B SALZBERG ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Phase Ii ◽  
Phase Ii Study ◽  
Active Ulcerative Colitis
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