Uncertainty Assessment in Well Productivity Loss due to Formation Damage

2005 ◽  
Author(s):  
Y. Ding ◽  
G. Renard ◽  
B. Herzhaft
Keyword(s):  
Productivity Loss ◽  
Uncertainty Assessment ◽  
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

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

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.

Estimation of Horizontal-Well Productivity Loss Caused by Formation Damage on the Basis of Numerical Modeling and Laboratory-Testing Data

SPE Journal ◽  
2018 ◽  
Vol 24 (01) ◽  
pp. 44-59 ◽  
Author(s):  
Dmitry D. Vodorezov
Keyword(s):  
Analytical Solutions ◽  
Laboratory Testing ◽  
Horizontal Well ◽  
Damage Zone ◽  
Formation Damage ◽  
Well Productivity ◽  
Skin Factor ◽  
Damaged Zone ◽  
Variable Distribution ◽  
The Impact

Summary This paper presents a new numerical model of inflow to a well with a zone of damaged permeability. It is built on the principle of dividing the wellbore and damaged permeability zone into numerous segments. Simultaneous work of the segments is modeled with the method of velocity-potential theory. The model is applicable for wellbores of different trajectories including horizontal and multilateral wells. The model is focused on the extended application of results obtained during laboratory core testing that include a return-permeability (RP) profile of the core and cleanup parameters. The developed solution includes the effects of anisotropy, reservoir-boundary conditions, and a nonuniform distribution of formation damage in both radial and axial directions. The paper presents the new approach to include depth-variable distribution of damage in skin-factor models. The approach provides for the evaluation of pressure drop in a depth-variable damage zone by the resulting permeability that is defined by flow regime. Laboratory-obtained overall core permeability is associated with a linear flow, and when applied to a zone near the wellbore with radial or elliptic flow, it causes an error because of the depth-variable distribution of damage. The provided numerical simulations show that the impact of this factor on horizontal-well productivity is significant. The developed model is compared with existing analytical solutions of Furui et al. (2002) (FZH) and Frick and Economides (1993) (FE) for the case of a horizontal well with a cone-shaped damaged zone. The results show that a skin-factor transformation originally proposed by Renard and Dupuy (1991) for a case of a uniformly damaged well can be used successfully for the referred-to analytical solutions, which makes them applicable for wells with an elliptic drainage area. In this paper, we also suggest an approach whereby we relate the characteristics of the cleanup of the region near the wellbore to laboratory-testing conditions.

Sign in / Sign up

Export Citation Format

Share Document