scholarly journals Improved Bottomhole Pressure Control for Underbalanced Drilling Operations

2004 ◽  
Author(s):  
C. Perez-Tellez ◽  
J.R. Smith ◽  
J.K. Edwards
Keyword(s):  
Pressure Control ◽  
Underbalanced Drilling ◽  
Drilling Operations ◽  
Bottomhole Pressure

Flow and pressure control of underbalanced drilling operations using NMPC

2018 ◽  
Vol 68 ◽  
pp. 73-85 ◽  
Author(s):  
Torbjørn Pedersen ◽  
Ulf Jakob F. Aarsnes ◽  
John-Morten Godhavn
Keyword(s):  
Pressure Control ◽  
Underbalanced Drilling ◽  
Drilling Operations

Mathematical modeling of formation damage effect during underbalanced drilling operations

2019 ◽  
Vol 5 (4) ◽  
pp. 1651-1661 ◽  
Author(s):  
Erfan Aghashahi Ardestani ◽  
Afshin Davarpanah ◽  
Ghasem Zargar ◽  
Behnam Mirshekari
Keyword(s):  
Mathematical Modeling ◽  
Damage Effect ◽  
Formation Damage ◽  
Underbalanced Drilling ◽  
Drilling Operations

Development of a Neural Fuzzy System for Advanced Prediction of Bottomhole Circulating Pressure in Underbalanced Drilling Operations

2011 ◽  
Vol 29 (21) ◽  
pp. 2282-2292 ◽  
Author(s):  
A. Feili Monfared ◽  
M. Ranjbar ◽  
H. Nezamabadi-Poor ◽  
M. Schaffie ◽  
R. Ashena
Keyword(s):  
Fuzzy System ◽  
Underbalanced Drilling ◽  
Drilling Operations ◽  
Neural Fuzzy

Oxidation Characteristics of Light Hydrocarbons for Underbalanced Drilling Applications

2002 ◽  
Author(s):  
Helen A. Ferguson ◽  
S. A. Mehta ◽  
R. Gordon Moore ◽  
Nancy E. Okazawa ◽  
Matthew G. Ursenbach
Keyword(s):  
Drilling Fluid ◽  
Inert Atmosphere ◽  
Core Material ◽  
Oxidation Reactions ◽  
Temperature Oxidation ◽  
Elevated Pressures ◽  
Underbalanced Drilling ◽  
Drilling Operations ◽  
Higher Temperature ◽  
Mineral Matrix

This investigation is directly relevant to various applications associated with the safety aspects of underbalanced drilling operations where de-oxygenated air may be co-injected with oil-based drilling fluid. However, de-oxygenated air often still contains up to 5% oxygen by volume. This residual oxygen can react with oil during the drilling process, thereby forming potentially hazardous oxidized hydrocarbons and compromising the safety of drilling operations. This article examines the conditions and processes by which oxidation reactions occur and may be helpful in reducing risk in drilling operations. This project characterizes the oxidation behaviour of several oils and a typical oil-based drilling fluid at atmospheric and elevated pressures using thermogravimetry (TG) and pressurized differential scanning calorimetry (PDSC). Tests performed on mineral matrix (core) from the oil reservoirs showed no reactivity in both inert and oxidizing atmospheres. In an inert atmosphere, tests on all hydrocarbon samples showed only vapourization, no reactivity. In an oxidizing environment, the tests on hydrocarbons showed several oxidation regions. The presence of core had no effect on the behaviour of the hydrocarbons tested in an inert atmosphere but accelerated the higher temperature oxidation reactions of the oil samples. The oil-based drilling fluid exhibited the opposite effect — the presence of core material retarded the oxidation reactions. This is perhaps due to the presence of an oxygen scavenger reacting with oxygen containing clays present in the mineral matrix. In all tests performed on mixtures of hydrocarbon and core in oxidizing atmospheres, elevated pressures resulted in acceleration of the lower and higher temperature reaction regions.

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