Systematic Approach to Well Productivity Evaluation To Determine the Significance of Formation Damage for Wells Drilled in a Depleted Reservoir without Bridging Particles: Oseberg Main Case History

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

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

Resolving Multiple Formation Damage Mechanism in Carbonate Reservoir Through Systematic Approach Using Combination of Aromatic Solvent and Less Aggressive Acid

2021 ◽  
Author(s):  
Hamzah Kamal ◽  
Prakoso Noke Fajar ◽  
Ghozali Farid ◽  
Aryanto Agus ◽  
Priyantoro Tri Atmojo ◽  
...  
Keyword(s):  
Systematic Approach ◽  
Oil Production ◽  
Damage Mechanism ◽  
Carbonate Reservoir ◽  
Formation Damage ◽  
Water Production ◽  
Aromatic Solvent ◽  
Well Productivity ◽  
Production Phase ◽  
Water Breakthrough

Abstract There is no well operation that is truly non-damaging. Any invasive operation, even production phase itself, may be damaging to well productivity. An interesting case was found in L-Field which is located in South Sumatra, Indonesia. All four wells are predicted to cease to flow after five-year production and artificial lift have to be installed to prevent steep decline in oil production. Unfortunately, all of wells’ productivity index (PI) decreased post well intervention and therefore, couldn’t achieve target. The PI was continuously decreasing during production phase and aggravated the decline in oil production. Remediation action by systematic approach was applied to solve the problem. Early diagnostic revealed some potential causes through evaluation of both production and well treatment data. Laboratory test such as mineralogy analysis, crude composition and water analysis, solubility and compatibility test have been conducted and clarified the root cause that formation damage occurred in multiple mechanism related to incompatibility of the workover fluid and organic deposition. Then, possible well treatments were listed with pros and cons by considering post water production related to the carbonate reservoir properties. Subsequently, chemical matrix injection was ranked based on less possibility of water breakthrough risk. Diesel fuel and de-emulsifier injection was decided as the first treatment in order to remove formation damage caused by organic deposition. The rate was increased temporary with Water Cut (WC) remained at the same level. The subseqeuent effort was to inject low reaction chelating acid and the result showed temporary improvement and the production did achieve significant gain. Finally, the third attempt indicated promising results with the injection of aromatic solvent followed by chelating acid. The well productivity was increased to more than 20 times of the pre treatment levels. The method can be replicated to other affected wells with similar damage mechanism. High vertical permeability over horizontal permeability becomes a real threat in carbonate strong water driver reservoir in L-field. Thus, matrix acidizing treatment has to be carefully applied to prevent unwanted water production. Non-aggressive and slow reaction acid were chosen to prevent face dissolution reaction that leads to water breakthrough.

Innovative Completion Design and Systematic Approach Improves Operating Efficiency and Enhances Well Productivity

2009 ◽  
Author(s):  
Dickson Utomhin Omonze ◽  
Michael Roderick Jackson ◽  
Gildardo Osorio ◽  
Eduardo R. Blanco
Keyword(s):  
Systematic Approach ◽  
Operating Efficiency ◽  
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.

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