Well Productivity Evaluation and Implications for the Significance of Formation Damage: Oseberg Main Case History

2020 ◽  
Author(s):  
Niall Fleming ◽  
Erlend Moldrheim ◽  
Espen Teigland ◽  
Anne-Mette Mathisen
Keyword(s):  
Case History ◽  
Formation Damage ◽  
Well Productivity

Successful Single-Stage Cementing in a Weak Formation: A Case History in Spain

2014 ◽  
Author(s):  
A.. Bottiglieri ◽  
A.. Brandl ◽  
R.S.. S. Martin ◽  
R.. Nieto Prieto
Keyword(s):  
Engineering Design ◽  
Case History ◽  
Laboratory Testing ◽  
Single Stage ◽  
Formation Damage ◽  
Cement Slurry ◽  
Integrity Test ◽  
Open Hole ◽  
Zonal Isolation ◽  
Horizontal Wellbore

Abstract Cementing in wellbores with low fracture gradients can be challenging due to the risk of formation breakdowns when exceeding maximum allowable equivalent circulation densities (ECDs). Consequences include severe losses and formation damage, and insufficient placement of the cement slurry that necessitates time-consuming and costly remedial cementing to ensure zonal isolation. In recent cementing operations in Spain, the formation integrity test (FIT) of the open hole section indicated that the formation would have been broken down and losses occurred based on calculated equivalent circulating densities (ECDs) if the cement slurry had been pumped in a single-stage to achieve the operator's top-of-cement goal. As a solution to this problem, cementing was performed in stages, using specialty tools. However, during these operations, the stage tool did not work properly, wasting rig time and resulting in unsuccessful cement placement. To overcome this issue, the operator decided to cement the section in a single stage, preceded by a novel aqueous spacer system that aids in strengthening weak formations and controlling circulation losses. Before the operation, laboratory testing was conducted to ensure the spacer system's performance in weak, porous formations and better understand its mechanism. This paper will outline the laboratory testing, modeling and engineering design that preceded this successful single stage cementing job in a horizontal wellbore, with a final ECD calculated to be 0.12 g/cm3 (1.00 lb/gal) higher than the FIT-estimated figure.

Well-Productivity Improvement by Use of Rapid Overpressured Perforation Extension: Case History

1996 ◽  
Vol 48 (02) ◽  
pp. 154-159 ◽  
Author(s):  
L. Petitjean ◽  
B. Couet ◽  
J.C. Abel ◽  
J.H. Schmidt ◽  
K.R. Ferguson
Keyword(s):  
Case History ◽  
Productivity Improvement ◽  
Well Productivity

Application of Low Carbon Acid Compound Deplugging Technology

2012 ◽  
Vol 560-561 ◽  
pp. 644-650
Author(s):  
Ji Gang Wang ◽  
Zhe Ming Zhang ◽  
Ming Li Zhao
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acid ◽  
Flow Resistance ◽  
Formation Damage ◽  
Geological Condition ◽  
Low Carbon ◽  
Well Productivity ◽  
Carbon Dioxide Gas ◽  
Carbon Acid ◽  
Acid Compound

Formation damage is mainly due to the reduction of reservoir energy and the increase of flow resistance from reservoir. According to this theory, low carbon acid compound deplugging technology is introduced to improve well productivity. The compound blocking remover which will be used is consist of low carbon acid, rudimentary fatty acid and surfactant and so on. Where geological condition a large volume of carbon dioxide gas generate, through increasing the reservoir energy, removing all kinds of reservoir choke, the well productivity will increase effectively.

Using Underbalanced Drilling to Reduce Invasive Formation Damage And Improve Well Productivity-An Update

10.2118/98-58 ◽  
1998 ◽  
Author(s):  
D.B. Bennion ◽  
F.B. Thomas ◽  
A.K.M. Jammaluddin ◽  
T. Ma ◽  
C. Agnew
Keyword(s):  
Formation Damage ◽  
Well Productivity ◽  
Underbalanced Drilling
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