Evaluating Formation Damage Risks in a Glauconitic Sandstone Reservoir: A Case History from the Offshore North West Shelf of Australia

1996 ◽  
Author(s):  
G.B. Hatcher ◽  
H. Chen ◽  
S.S. Rahman ◽  
P.F. Hogg
Keyword(s):  
Case History ◽  
Formation Damage ◽  
North West ◽  
Sandstone Reservoir

Innovative Process for Formation Damage Removal in Sandstone Reservoir Based on Real-Time Downhole Monitoring: A Malaysia Case History

2015 ◽  
Author(s):  
Latief Riyanto ◽  
Mohd Nizar Musa ◽  
Nurul Asyikin Mat Deris ◽  
Mohd Yuzmanizei Yaakub ◽  
Rohaizat Ghazali ◽  
...  
Keyword(s):  
Real Time ◽  
Case History ◽  
Formation Damage ◽  
Innovative Process ◽  
Sandstone Reservoir ◽  
Downhole Monitoring

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 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
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