Integrating Pulse Neutron Measurements with Array Production Logging for Enhanced Production Characterization in Horizontal Wells

2018 ◽  
Author(s):  
Noureddine Benlakhdar ◽  
Al-Nasser Mamdouh ◽  
Pervaiz Iqbal ◽  
Hussain Al-Shabibi
Keyword(s):  
Horizontal Wells ◽  
Pulse Neutron ◽  
Enhanced Production ◽  
Array Production

scholarly journals Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile

2013 ◽  
Author(s):  
L. Liao ◽  
D. Zhu ◽  
N. Yoshida ◽  
A.D. Hill ◽  
Minquan Jin
Keyword(s):  
Horizontal Wells ◽  
Flow Profile ◽  
Array Production

Activation of cytochrome c to a peroxidase compound I-type intermediate by H2O2: relevance to redox signalling in apoptosis

2004 ◽  
Vol 71 ◽  
pp. 97-106 ◽  
Author(s):  
Mark Burkitt ◽  
Clare Jones ◽  
Andrew Lawrence ◽  
Peter Wardman
Keyword(s):  
Cytochrome C ◽  
Hydroxyl Radical ◽  
Redox Regulation ◽  
Chemotherapeutic Agents ◽  
Tyrosyl Radical ◽  
Compound I ◽  
Definitive Evidence ◽  
Enhanced Production ◽  
Physico Chemical

The release of cytochrome c from mitochondria during apoptosis results in the enhanced production of superoxide radicals, which are converted to H2O2 by Mn-superoxide dismutase. We have been concerned with the role of cytochrome c/H2O2 in the induction of oxidative stress during apoptosis. Our initial studies showed that cytochrome c is a potent catalyst of 2′,7′-dichlorofluorescin oxidation, thereby explaining the increased rate of production of the fluorophore 2′,7′-dichlorofluorescein in apoptotic cells. Although it has been speculated that the oxidizing species may be a ferryl-haem intermediate, no definitive evidence for the formation of such a species has been reported. Alternatively, it is possible that the hydroxyl radical may be generated, as seen in the reaction of certain iron chelates with H2O2. By examining the effects of radical scavengers on 2′,7′-dichlorofluorescin oxidation by cytochrome c/H2O2, together with complementary EPR studies, we have demonstrated that the hydroxyl radical is not generated. Our findings point, instead, to the formation of a peroxidase compound I species, with one oxidizing equivalent present as an oxo-ferryl haem intermediate and the other as the tyrosyl radical identified by Barr and colleagues [Barr, Gunther, Deterding, Tomer and Mason (1996) J. Biol. Chem. 271, 15498-15503]. Studies with spin traps indicated that the oxo-ferryl haem is the active oxidant. These findings provide a physico-chemical basis for the redox changes that occur during apoptosis. Excessive changes (possibly catalysed by cytochrome c) may have implications for the redox regulation of cell death, including the sensitivity of tumour cells to chemotherapeutic agents.

Dual casing design for horizontal wells

2017 ◽  
Vol 11 ◽  
pp. 34-39
Author(s):  
R.R. Giniatullin ◽  
◽  
V.V. Kireev ◽  
R.R. Galimyllin ◽  
N.G. Bravkova ◽  
...  
Keyword(s):  
Horizontal Wells

Special-purpose downhole sucker rod pumps for directional and horizontal wells: results of pilot experiments in Tatneft

2019 ◽  
pp. 47-51
Author(s):  
K.V. Valovsky ◽  
◽  
G.Yu. Basos ◽  
V.M. Valovsky ◽  
A.V. Artyukhov ◽  
...  
Keyword(s):  
Horizontal Wells ◽  
Sucker Rod
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