Acid Fracturing Depleted Carbonates Improving Very Low Reservoir Quality Inside Slim Horizontal Open Hole

2018 ◽  
Author(s):  
Amr Abd El Baky ◽  
Nawaf Al-Shuaibi ◽  
Alaa Eldine Alboueshi ◽  
Mohamed Elmofti ◽  
Ebrahim Elafify ◽  
...  
Keyword(s):  
Reservoir Quality ◽  
Acid Fracturing ◽  
Open Hole

Acid Fracturing Depleted Carbonates Improving Very Low Reservoir Quality Inside Slim Horizontal Open Hole (Russian)

2018 ◽  
Author(s):  
Amr Abd El Baky ◽  
Nawaf Al-Shuaibi ◽  
Alaa Eldine Alboueshi ◽  
Mohamed Elmofti ◽  
Ebrahim Elafify ◽  
...  
Keyword(s):  
Reservoir Quality ◽  
Acid Fracturing ◽  
Open Hole

Delivering A Successful Acid Fracturing Job Through Integrated GGR Analysis and Stimulation Study, Case Study of A Tight Gas-Condensate Reservoir In Central Kalimantan, Indonesia

2020 ◽  
Author(s):  
R. Rizkiaputra
Keyword(s):  
Dynamic Analysis ◽  
Reservoir Simulation ◽  
Transient Analysis ◽  
Reservoir Quality ◽  
Fracture Geometry ◽  
Central Kalimantan ◽  
Acid Fracturing ◽  
Condensate Reservoir ◽  
Acid Solubility ◽  
Geological Concept

The biggest challenge for producing a tight (<0.1 mD) gas-condensate reservoir is its low deliverability. Therefore, it is important to consider well stimulation in the field development program. There are several types of stimulation, and one of the types which has the most impact is acid fracturing. However, thorough study needs to be carried out to ensure its compatibility with the specific reservoir condition. This paper will describe in detail how the geology, geophysics and reservoir (GGR) analysis and the stimulation study play its role to create a successful acid fracturing job in Indonesia, specifically in Central Kalimantan. The study begins with the understanding of reservoir geological concept and its characterization using multiple seismic attributes and core sedimentology. This geology and geophysical (G&G) analysis is further enhanced by performing dynamic analysis such as pressure transient analysis (PTA), rate transient analysis (RTA), and flowing material balance (FMB). Following this, feasibility of acid fracturing is assessed by performing the geomechanical analysis and acid solubility test. Moreover, the fracture geometry is also simulated to make sure the resulting fracture is able to penetrate the good reservoir quality. Then, performance projection using reservoir simulation is performed to quantify the expected incremental gain from the job. The geological concept differentiates this platform carbonate into six depositional elements, in which all of the production wells are located in the Reef Complex. It is further defined using the combination of seismic attributes, petrophysical analysis, and production performance, which are able to map the reservoir quality distribution. From the dynamic analysis, it shows that each well has massive connected gas initial in place (GIIP) with several wells are having poor facies nearby that act as the barrier. The study is followed by a stimulation study which shows that the reservoir has hard rock characteristics (Young Modulus up to 3.2 million psi) and high acid solubility (up to 95%), suitable for acid fracturing job. Simulated fracture geometry shows that it could penetrate nearby poor facies and achieve the good facies target. Then, the reservoir simulation also shows that significant production gain could be obtained from the job. Following up on the encouraging result of GGR & stimulation study, the first acid fracturing campaign in this field is sanctioned and performed safely & successfully. It delivers a very encouraging result in which one of the wells shows a productivity increase of up to 200%. Production forecast shows that post-fracturing well performance could sustain the plateau rate up to two and a half years and provide an addition of 25 BSCF of proved developed producing reserves. Material enough for increasing the field profitability and optimizing future development plans. This study shows that understanding the reservoir by doing integrated GGR analysis has significant benefit to reveal the upside potential of the field. Moreover, the excellent result on acid fracturing feasibility study and fracture design prior to the job ensures that it could be performed safely, successfully, and significantly increase the well productivity.

Application of Mean Square Deviation Method to the Target Selection of Acid Fracturing for Fissure-Cavern Carbonate Reservoirs

2015 ◽  
Vol 1092-1093 ◽  
pp. 1356-1360
Author(s):  
Ya Hong Wu ◽  
Li Wang ◽  
Hao Qing Fang ◽  
Xi Shan Tian ◽  
Qiang Bo Mi ◽  
...  
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Target Selection ◽  
Carbonate Reservoirs ◽  
Physical Parameters ◽  
Mean Square ◽  
Mean Square Deviation ◽  
Acid Fracturing ◽  
Open Hole ◽  
Deviation Method

The Ordovician fissure-cavern carbonate reservoirs of Tarim Basin have relatively large production thickness, long completion intervals and serious heterogeneity problems, former studies about physical parameters for fractured intervals of acid fracturing cannot be well presented through mean algorithm method. This paper uses mean square deviation method to acquire the values of the main influencing factors of acid fracturing, then optimizes the physical characteristics of the fractured intervals. The BP neural network simulation has been adopted to get the optimal BP neural network structure model. In Tarim, this study has simulated 20 wells before acid fracturing using the decision software which compiled by the optimum neural network construction. Comparative analysis has been made through application examples, the coincident rate of mean algorithm is 75%, compared with the 90% of mean square deviation method. Therefore, during the target selection for acid fracturing of heterogeneous carbonate reservoirs with long open hole intervals, it’s significant to use mean square deviation method to optimize physical parameters of reservoirs.

scholarly journals Reservoir characteristics of intracontinental carbonate ramp deposits-Upper Muschelkalk, Middle Triassic, NE Netherlands

2004 ◽  
Vol 83 (1) ◽  
pp. 1-15 ◽  
Author(s):  
M. C. Pöppelreiter ◽  
A. Simone ◽  
G. Hoetz
Keyword(s):  
Large Scale ◽  
Gas Production ◽  
Carbonate Ramp ◽  
Reservoir Quality ◽  
Comprehensive Description ◽  
Sequence Stratigraphic ◽  
Stratigraphic Model ◽  
Upper Muschelkalk ◽  
Open Hole ◽  
Nw Europe

AbstractThe Upper Muschelkalk is an unusual reservoir in NW Europe, producing only in the Coevorden Muschelkalk field, onshore the Netherlands. Origin and nature of the gas producing intervals were poorly known. The objective of the paper is to provide a comprehensive description of facies, cyclicity and petrophysical characteristics. From this description a depositional and sequence stratigraphic model is proposed, which explains why there is gas production only from certain intervals of the sequence. Our investigation is based on seismic, core and open hole log data. It indicates that the reservoir consists of dolomites, which are either muddy lagoonal to sabkha, or grainy backshoal deposits. The best reservoir quality is encountered in peloidal-oolitic packstones to grainstones. These represent storm-dominated backshoal deposits and constitute the inner part of a homoclinal carbonate ramp. The succession shows a conspicuous hierarchical cyclicity. Porous backshoal deposits form during maximum transgression and early regression. However permeable, gas producing backshoal deposits only occur in the upper 15 to 20 m, which forms the large-scale regressive hemi-cycle of the Upper Muschelkalk. Better reservoir quality in the upper hemi-cycle is due to changes in grain type and early diagenesis. The investigation might serve as calibration point for further exploring the Upper Muschelkalk reservoir and its facies pattern in the NW European basin.

Carbonate Tight Zones Detection and Their Impacts on Bangestan Reservoir Quality, Ahvaz Oil Field, SW Iran

2017 ◽  
Vol 6 (3) ◽  
pp. 21-30
Author(s):  
Masoud Soleimani ◽  
◽  
Bahman Soleimani ◽  
Bahram Alizadeh ◽  
Iman Veisy ◽  
...  
Keyword(s):  
Oil Field ◽  
Reservoir Quality ◽  
Sw Iran
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