Abnormal Pressure in Hydrocarbon Environments

1998 ◽  
Author(s):  
Ben E. Law ◽  
C. W. Spencer
Keyword(s):  
Abnormal Pressure

scholarly journals Abnormal Pressure Passive Dilatation of Cerebral Arterioles in the Elderly With Isolated Systolic Hypertension

Hypertension ◽  
2006 ◽  
Vol 48 (6) ◽  
pp. 1143-1150 ◽  
Author(s):  
Sergio Castellani ◽  
Marzia Bacci ◽  
Andrea Ungar ◽  
Patrizio Prati ◽  
Claudia Di Serio ◽  
...  
Keyword(s):  
Systolic Hypertension ◽  
The Elderly ◽  
Isolated Systolic Hypertension ◽  
Abnormal Pressure ◽  
Cerebral Arterioles

Characteristics of Abnormal Pressure Systems and Their Responses of Fluid in Huatugou Oil Field, Qaidam Basin

2009 ◽  
Vol 83 (5) ◽  
pp. 939-950 ◽  
Author(s):  
Xiaozhi CHEN ◽  
Hao XU ◽  
Dazhen TANG ◽  
Junfeng ZHANG ◽  
Xiaolan HU ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Oil Field ◽  
Abnormal Pressure

scholarly journals Abnormal Pressure Distribution of Tertiary age formations in Middle & South Iraqi Oil Fields

2021 ◽  
Vol 7 (4) ◽  
pp. 46-63
Author(s):  
Dr. Faleh H. M. Almahdawi ◽  
Dr. Kareem A. Alwan ◽  
Ahmed K. H. Alhusseini
Keyword(s):  
Hydrostatic Pressure ◽  
Pressure Distribution ◽  
Oil Fields ◽  
Formation Pressure ◽  
Abnormal Pressure ◽  
Drilling Operations ◽  
South Of Iraq ◽  
Abnormal Formation Pressure ◽  
Formation Pore Pressure ◽  
Pore Pressure Gradient

Prediction of formation pore pressure gradient is a very important factor in designingdrilling well program and it help to avoid many problems during drilling operations such as lostcirculation, kick, blowout and other problems.In this study, abnormal formation pressure is classified into two types; abnormal highpressure (HP) and abnormal low pressure (LP), therefore any pressure that is either above orbelow the hydrostatic pressure is referred to as an abnormal formation pressure.This study concerns with abnormal formation pressure distribution and their effect ondrilling operations in middle & south Iraqi oil fields. Abnormal formation pressure maps aredrawn depending upon drilling evidence and problems.Three formations are considered as abnormal formations in the region of study, theseformations geologically existed in Tertiary age and they from shallower to deeper are: LowerFars, Dammam and Umm Er Radhuma, Formations. The maps of this study referred to eitherhigh formations pressure such as (Lower Fars and Umm Er Radhuma) or the low formationspressure such as (Dammam) in middle and south of Iraq. Finally these maps also suggested andshowed the area, where no field is drill until now, which may behave as high, low and normalformation pressure for every formation understudy.

Bicentric Milling Approach Enables the Recovery of the Horizontal Section of an Unconventional Well in Turkey

2021 ◽  
Author(s):  
Ernesto Franco Delgado ◽  
Felix Jahn ◽  
Liam Weir ◽  
Brian Bruce ◽  
Nestor Carreno
Keyword(s):  
Horizontal Section ◽  
Coiled Tubing ◽  
Cutting Head ◽  
Abnormal Pressure ◽  
Viable Solution ◽  
Casing Damage ◽  
Pump Rate ◽  
Engineering Team ◽  
Efficient Recovery ◽  
Casing Deformation

Abstract During the completion phase of an unconventional well in Turkey, casing deformation represented a challenge to the operator and Coiled Tubing (CT) service provider due to the potential loss of almost 70% of the horizontal section. The deformation obstructed the path to continue the milling the remaining plugs. The implementation of bicentric mills and Multi-Cycling Circulation Valve (MCCV) incorporated in the milling assembly allowed efficient recovery of the horizontal section. The tubing condition analysis done by the engineering team showed that symmetric mills would not be beneficial. Conformance tubing was not an option. Bicentric milling approach was deemed the most viable solution. This approach consists of using offset mills where rotation causes the cutting head to cover an area larger than the mill's frontal face. However, this approach could lead the CT pipe getting stuck due to big junk left. The use of a MCCV, limiting the number of milled plugs, and performing a fishing run between milling runs were key to the success of the bicentric milling approach. The Turkish well was completed with ten stages isolated by nine aluminum plugs. During the fracturing of stage seven, an abnormal pressure drop was observed while keeping the same pump rate, indicating possible casing damage. After all the stages were fractured, the CT proceeded to mill the plugs using a 4.63-in Outside Diameter (OD) mill. After three plugs were milled, an obstruction was detected, indicated by frequent aggressive motor stalls at the same depth. A tapered mill was run to perform a tubing conformance, and after several hours of unsuccessful penetration, the tool was recovered. At the surface, the tool showed signs of wear around 4.268 in. A 4.0-in OD mill was used to drift this section, and it passed free. An analysis of both the plug anatomy and the casing condition was done to determine the most viable solution. A 4-in OD bicentric mill was designed to pass across the restriction with an adjusted eccentricity to allow higher contact area. Three bicentric milling runs were made with the limit of a maximum of two plugs per run to avoid a CT stuck situation due to the larger cuttings as a result of the mill's asymmetry. The sparsity of information on using bicentric mills for plug milling required research into unpublished practices for such scenarios. This paper documents bicentric milling approach, the use of offset mills, and the mitigation measurements taken during this project to avoid a stuck situation due to large debris generated.

Abnormal Pressure in the Antelope Field, North Dakota

1969 ◽  
Vol 21 (07) ◽  
pp. 821-826 ◽  
Author(s):  
William C. Finch
Keyword(s):  
North Dakota ◽  
Abnormal Pressure

scholarly journals Leukocyte-derived extracellular DNA contributes to abnormal pressure elevation in the extracorporeal circulation circuit

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Nozomi Yashima ◽  
Takashi Ito ◽  
Kenji Kajiyama ◽  
Hiroyuki Maeda ◽  
Yasuyuki Kakihana ◽  
...  
Keyword(s):  
Extracorporeal Circulation ◽  
Extracellular Dna ◽  
Pressure Elevation ◽  
Abnormal Pressure ◽  
Circulation Circuit
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