A New Method for Well-Specific-Risk Analysis in Drilling Operations

1998 ◽  
Author(s):  
Lasse Berg Andersen ◽  
Gunnar Veire ◽  
Borgar Rokke
Keyword(s):  
Risk Analysis ◽  
New Method ◽  
Specific Risk ◽  
Drilling Operations

scholarly journals A new method for correcting temperature log profiles in low-enthalpy plays

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Sandra Schumacher ◽  
Inga Moeck
Keyword(s):  
Input Parameter ◽  
New Method ◽  
Geothermal Resources ◽  
The North ◽  
Deep Wells ◽  
Thermal Disturbance ◽  
Drilling Operations ◽  
Crucial Information ◽  
Well Data ◽  
Drilling Time

Abstract Temperature logs recorded shortly after drilling operations can be the only temperature information from deep wells. However, these measurements are still influenced by the thermal disturbance caused by drilling and therefore do not represent true rock temperatures. The magnitude of the thermal disturbance is dependent on many factors such as drilling time, logging procedure or mud temperature. However, often old well reports lack this crucial information so that conventional corrections on temperature logs cannot be performed. This impedes the re-evaluation of well data for new exploration purposes, e.g. for geothermal resources. This study presents a new method to correct log temperatures in low-enthalpy play types which only requires a knowledge of the final depth of the well as an input parameter. The method was developed and verified using existing well data from an intracratonic sedimentary basin, the eastern part of the North German Basin. It can be transferred to other basins with little or no adjustment.

scholarly journals Evaluating the Efficiency of School Preceptors by Fuzzy Risk Analysis

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Rasoul Saneifard ◽  
Rahim Saneifard
Keyword(s):  
Risk Analysis ◽  
Fuzzy Number ◽  
Fuzzy Numbers ◽  
New Method ◽  
Arithmetic Operations ◽  
Fuzzy Risk Analysis ◽  
Fuzzy Weights

This paper presents a new method for evaluating the efficiency of school preceptors based on fuzzy number arithmetic operations. It uses fuzzy numbers to represent fuzzy grades. The fuzzy weights of criteria are automatically generated from the opinions of evaluators. The simplified fuzzy number arithmetic operations are used for calculating the average of fuzzy numbers. It can evaluate the efficiency of school preceptors in a more flexible and more intelligent manner.

A new method for risk analysis of vaccines

Vaccine ◽  
1999 ◽  
Vol 17 (19) ◽  
pp. 2335 ◽  
Author(s):  
J Poirriez
Keyword(s):  
Risk Analysis ◽  
New Method

Field Demonstration of a New Method for Making Drill-Pipe Connections during Managed-Pressure Drilling Operations

2011 ◽  
Author(s):  
Rachel Lynn Johnson ◽  
Julio Cesar Montilva ◽  
Mohamed Fagir Sati ◽  
Jeffery L. Grable ◽  
Saad Saeed ◽  
...  
Keyword(s):  
Drill Pipe ◽  
New Method ◽  
Managed Pressure Drilling ◽  
Drilling Operations

scholarly journals Risk Analysis of DP Incidents During Drilling Operations

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Zaloa Sanchez-Varela ◽  
David Boullosa-Falces ◽  
Juan Luis Larrabe-Barrena ◽  
Miguel Angel Gomez-Solaeche
Keyword(s):  
Risk Analysis ◽  
Significant Risk ◽  
Dynamic Positioning ◽  
Traditional Classification ◽  
Drilling Operations ◽  
Type Of Failure ◽  
Financial Losses

This paper aims to present a method to determine the type of dynamic positioning (DP) incidents that have a more significant risk during drilling operations in the period 2007-2015, according to the element or the type of failure that causes the DP system to fail. Two different classifications are made: 1) according to the element that produces the incident (which has been the traditional classification in the industry) and 2) according to the type of error that arises, the latter being an alternative classification proposed in this paper. The predictable financial losses for each level of severity are used to define the resulting consequences for each case. A risk analysis is performed with the data obtained, showing the potentially more dangerous incidents, either because of their higher number of occurrences or because their consequences are remarkable. According to the classification proposed, the main causes with the higher risk results were power and environmental, according to the traditional classification, and fault/failure. Thus, the power segment’s combination of failures is the riskiest cause during the DP drilling operations.

Underwater Inspection Using ROV

2021 ◽  
Author(s):  
Mahmoud Ahmed Elshahawy ◽  
Helmy Abdel Wahab Younes ◽  
Imad Al Hamlawi
Keyword(s):  
Service Time ◽  
Group Technology ◽  
New Method ◽  
Remotely Operated Vehicles ◽  
Time Loss ◽  
Inspection Process ◽  
Drilling Operations ◽  
Jack Up ◽  
Full Operation

Abstract ADNOC Drilling operates a growing fleet of 22 jack up units. These units require various inspections and tests to ensure that their integrity is maintained while conducting the drilling operations. One of these inspections is the underwater inspection which is required to be carried out twice every 5 years. Traditionally, this inspection is carried out by divers at the shipyard where it is safe for divers to carry out cleaning, visual inspections and NDT of structural welds. Moving the rig to a drydock or a shipyard is a costly and involves a lot of activities related to safety in addition to the out of service time. Loss of revenue is experienced while the rig is out of service, as well as costs associated to the survey, shipyard costs, vessel costs etc. all combining to create an expensive inspection process. ADNOC Drilling Marine and Group Technology adapted a new method for performing the full scope of the underwater inspection offshore using small remotely operated vehicles (ROV), most of the scope is carried out while the rig remains in full operation (while drilling).

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