scholarly journals Removing all Forms of Soluble Sulphides From Drilling Fluid

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Hassan A. Alwan
Keyword(s):  
Drilling Fluid ◽  
Total Concentration ◽  
High Rate ◽  
Ferrous Oxalate ◽  
Results Of Treatment ◽  
Drilling Equipment ◽  
Magnetite Fe3o4 ◽  
Iron Sulphides ◽  
Soluble Species ◽  
Water Base

The aim of this project is to remove or eliminate the effect of the highly toxic gas of H2S on the health of personal, environment, drilling fluid reology, and drilling equipment materials by adding an economic mixture of sulphide scavengers to the contaminated drilling fluid. In this research mixture of 14.7 gm/l of iron oxide in the form of magnetite (Fe3O4) and 14.7 gm/l of ferrous oxalate Fe(C2O4), which cost is 1.3 US$ per 1kg of mixture, was used to remove the all forms of soluble sulphides (H2S, HS-, S2-) from water-base drilling fluid. The Fe3O4 reacts with dissolved H2S and the reaction carry on fast at pH below 8, while Fe(C2O4) reacts with HS-, S2- and this reaction proceed at high rate at pH above 8. Both reactions produce insoluble iron sulphides. The chemical analysis showed that the soluble species of sulphides in the drilling fluid, which its pH was 7.9, were present as dissolved H2S gas and as bisulphide ions (HS-). The analysis also explained that the total concentration of these sulphides in the drilling fluid was 3000 ppm. The results of treatment of contaminated fluid showed that all forms of sulphides were removed from drilling fluid after adding the mixture of scavengers to the contaminated fluid. The results also explained that the drilling fluid reology recovered after removing the soluble sulphides, which were the main factors that effect on the drilling fluid reology, from the drilling fluid.

A Water-Base Drilling Fluid for Controlling Deep-Reservoir Extreme Conditions in an Abu Dhabi Gas Shale Play

2021 ◽  
Author(s):  
Gabe Manescu ◽  
Balazs Veer ◽  
Panamarathupalayam Balakrishnan ◽  
Carmelo Arena ◽  
Benoit Allias ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Abu Dhabi ◽  
Extreme Conditions ◽  
Gas Shale ◽  
Deep Reservoir ◽  
Water Base

Rheologically Stable, Nontoxic, High-Temperature Water-Base Drilling Fluid

1997 ◽  
Vol 12 (03) ◽  
pp. 158-162 ◽  
Author(s):  
Julianne Elward-Berry ◽  
J.B. Darby
Keyword(s):  
High Temperature ◽  
Drilling Fluid ◽  
High Temperature Water ◽  
Water Base ◽  
Temperature Water

scholarly journals Neurovascular reconstruction with flow diverter stents for the treatment of 87 intracranial aneurysms: Clinical results

2015 ◽  
Vol 21 (3) ◽  
pp. 292-299 ◽  
Author(s):  
Leonardo Giacomini ◽  
Ronie L Piske ◽  
Carlos E Baccin ◽  
Marcelo Barroso ◽  
Andrei F Joaquim ◽  
...  
Keyword(s):  
Intracranial Aneurysms ◽  
Interventional Neuroradiology ◽  
Clinical Results ◽  
Flow Diverter ◽  
High Rate ◽  
Complex Aneurysms ◽  
Results Of Treatment ◽  
Silk Stent ◽  
Flow Diverter Stent ◽  
Aneurysm Occlusion

Background Flow diverter stents represent a new endovascular tool to treat complex aneurysms, such as giant, large, wide-necked and fusiform. The highly dense mash of these stents reduces inflow and outflow inside the aneurysm, resulting in intra aneurysmal thrombosis and stent endothelialization. Objectives To present the results of treatment of intracranial aneurysms with flow diverter stents in a single center. Methods Retrospective review of 77 patients with 87 aneurysms treated using two different types of flow diverter stent, the Pipeline Embolization Device and SILK stent, between October 2010 and September 2013 in an interventional neuroradiology center. Results Flow diverter stent placement was successful in 98% of the lesions and resulted in an immediate major stasis within most of the treated aneurysms. The overall aneurysm occlusion rate at six months and 18 months was 80% and 84% respectively. Symptomatic complications occurred in 11 patients (14.3%) with morbidity in eight (10.4%) and mortality in three patients (3.9%). Conclusion Flow diversion is a promising technique for treatment of challenging intracranial aneurysms with acceptable morbidity. A high rate of complete occlusion for small large necked aneurysms, a low morbidity and mortality rate and no recanalization encourage their use in these aneurysms. Further studies accessing long-term aneurysm occlusion and recanalization are required.

A Controlled Retrospective Study of Behaviour Therapy in Phobic Patients

1965 ◽  
Vol 111 (476) ◽  
pp. 561-573 ◽  
Author(s):  
I. M. Marks ◽  
M. G. Gelder
Keyword(s):  
Matched Control ◽  
High Rate ◽  
Control Group ◽  
General Statement ◽  
Behaviour Therapy ◽  
Matched Control Group ◽  
Neurotic Disorders ◽  
Results Of Treatment ◽  
Rate Of Recovery ◽  
Natural Histories

Considerable claims have been made for behaviour therapy, but the evidence for its effectiveness is still conflicting. There are several reasons for this. First, although behaviour therapy is a convenient term to describe treatments which reputedly share a common derivation from learning theory, it describes techniques which differ widely from one another in practice, and which at the same time have features in common with other forms of psychotherapy. Secondly, behaviour therapy has been applied to a variety of neurotic disorders, ranging from writer's cramp to phobias, and these syndromes often have distinct natural histories. Any general statement about the value of behaviour therapy in a mixed group of neuroses is therefore of limited value. Thirdly, the well-known tendency of neurotic disorders to respond to energetic and enthusiastic treatment with non-specific methods makes it difficult to assess the results of treatment unless a matched control group is included in the investigation, or, in the absence of a control group, an exceptionally high rate of recovery is obtained.

Surgical Treatment of Congenital Heart Diseases in Adults

2001 ◽  
Vol 82 (3) ◽  
pp. 161-164
Author(s):  
V. N. Medvedev ◽  
Sh. M. Kurmaev ◽  
G. I. Kharitonov ◽  
R. F. Sadekov ◽  
I. I. Vagizov
Keyword(s):  
Pulmonary Hypertension ◽  
Congenital Heart ◽  
Heart Diseases ◽  
Interatrial Septum ◽  
High Rate ◽  
Congenital Heart Diseases ◽  
Rural Regions ◽  
Results Of Treatment ◽  
Secondary Defect ◽  
The Right

The results of treatment of 701 adult patients with congenital heart diseases from 1987 to 1997 are analyzed. As many as 248 operations with general postoperative lethality 3,2% are made. It is concluded on the necessity of improving the diagnosis of congenital heart diseases in children, especially in rural regions in relation to the high rate of inopportune revealing heart diseases resulting in the increase of the number of inoperable patients with pronounced pulmonary hypertension. The presence of symptoms or pronounced blood escape out of the left article into the right one in the absence of pulmonary hypertension is considered the indication to the radical correction of secondary defect of interatrial septum in adults. The radical heart disease correction in conditions of moderate hypotermy without artificial blood circulation is recommended in small secondary defect of interatrial septum

The Rheology and corrosivity of water-base drilling fluid under simulated downhole conditions

1996 ◽  
Vol 47 (6) ◽  
pp. 307-316 ◽  
Author(s):  
O. S. Shokoya ◽  
M. A. Al-Marhoun ◽  
O. A. Ashiru
Keyword(s):  
Drilling Fluid ◽  
Water Base
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