AGH Drilling, Oil, Gas
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ISSN 2299-4157
e-ISSN: 2300-7052
Issue Date
2013
Volume
Vol. 30
Number
No. 1
Description
Journal Volume
AGH Drilling, Oil, Gas
Vol. 30 (2013)
Projects
Pages
Articles
Study of usage efficiency of multistage filters on mineral leaching process
(2013) Alibaeva, Karlygaš Abylhakovna; Kul'džabekov, Alibek Bahidžanovič; Tungatorova, M. S.; Kaltaev, Ajdarhan
In this work the numerical study of the usage efficiency of the multistage filters setting technology on the process of mineral extraction by the in-situ leaching method is carried out on the basis of mathematical simulation. A comparison of the extraction degree at single and multistage filters is implemented. Obtained decisions for a multistage filters setting qualitatively conform to the experimental findings.
Analysis of production data from hydraulically fractured horizontal wells in Marcellus Shale
(2013) Aminian, Khashayar; Ameri, Samuel
Unconventional reservoirs play an enormous role in hydrocarbon production in the United States. Marcellus Shale, a Devonian black shale found in the Appalachian Basin, has shown notable promise in the past few years. Shale is a complicated, naturally fractured reservoir with ultra-low matrix permeability. The gas is stored in the limited pore space of these rocks and a sizeable fraction of the gas in place may be adsorbed on the organic material. Shale gas reservoirs differ from conventional reservoirs in that massive stimulation treatments are required to achieve economic production. Horizontal wells are the most effective in providing access to the formation to perform multi-stage hydraulic fracturing treatments. The limited field experience with multiple hydraulic fractures in horizontal wells completed in Marcellus Shale indicates that significant increase in initial production can be achieved as the number of hydraulic fractures is increased. However, the production performance, particularly over longer time periods, is not well established. The objective of this study was to investigate the long term production performance of multiply fractured horizontal wells completed in Marcellus Shale. Historical production data and stimulation treatment information have been collected and analyzed for a number of horizontal wells both in West Virginia and Pennsylvania. A commercial reservoir simulator which accounts both for dual porosity behavior and the adsorbed gas was utilized to history match the production performance. Based on the results of the history matching, the long term production performances of the multiply fractured horizontal wells were predicted. The results were then utilized to investigate the production decline behavior of Marcellus Shale horizontal wells. A number of conventional as well as shale specific production decline models were considered in these investigations. The results indicated the presence of different flow periods. The hydraulic fractures appear to dominate the early production performance which is characterized by linear flow. Gas desorption appears to impact on production decline behavior during the intermediate period. The late production is influenced by the reservoir boundaries and is controlled by natural fracture properties. A single decline model often cannot predict the entire production behavior and conventional decline analysis based on the early production data can lead to significant over-prediction of the future production rates or reserves. The results of this study can be utilized as guideline to investigate the feasibility horizontal wells with multiple hydraulic fractures and optimize the production from the shale formation.
Offshore drilled cuttings management
(2013) Bilstad, Torleiv; Stenberg, E. S.; Jensen, B.; Larsen, T.; Toft, Martin
Unconventional reservoirs play an enormous role in hydrocarbon production in the United States. Marcellus Shale, a Devonian black shale found in the Appalachian Basin, has shown notable promise in the past few years. Shale is a complicated, naturally fractured reservoir with ultra-low matrix permeability. The gas is stored in the limited pore space of these rocks and a sizeable fraction of the gas in place may be adsorbed on the organic material. Shale gas reservoirs differ from conventional reservoirs in that massive stimulation treatments are requiredto achieve economic production. Horizontal wells are the most effective in providing access to the formation to perform multi-stage hydraulic fracturing treatments. The limited field experience with multiple hydraulic fractures in horizontal wells completed in Marcellus Shale indicates that significant increase in initial production can be achieved as the number of hydraulic fractures is increased. However, the production performance, particularly over longer time periods, is not well established. The objective of this study was to investigate the long term production performance of multiply fractured horizontal wells completed in Marcellus Shale. Historical production data and stimulation treatment information have been collected and analyzed for a number of horizontal wells both in West Virginia and Pennsylvania. A commercial reservoir simulator which accounts both for dual porosity behavior and the adsorbed gas was utilized to history match the production performance. Based on the results of the history matching, the long term production performances of the multiply fractured horizontal wells were predicted. The results were then utilized to investigate the production decline behavior of Marcellus Shale horizontal wells. A number of conventional as well as shale specific production decline models were considered in these investigations. The results indicated the presence of different flow periods. The hydraulic fractures appear to dominate the early production performance which is characterized by linear flow. Gas desorption appears to impact on production decline behavior during the intermediate period. The late production is influenced by the reservoir boundaries and is controlled by natural fracture properties. A single decline model often cannot predict the entire production behavior and conventional decline analysis based on the early production data can lead to significant over-prediction of the future production rates or reserves. The results of this study can be utilized as guideline to investigate the feasibility horizontal wells with multiple hydraulic fractures and optimize the production from the shale formation.
Decision system model for HC exploration on the basis of DST test results
(2013) Dubiel, Stanisław; Zubrzycki, Adam; Maruta, Michał
The paper presents the results of 57 Drill Stem Tests (DST) within the Upper Jurassic carbonate rocks forming the Carpathian Fordeep basement in the area between Bochnia and Ropczyce (south Poland) performed by the Polish Oil and Gas Company in the years 1993 to 1998. Designated prospective horizons were tested with DST for assessing productivity of strata. DST tests were performed mostly in open hole sections of boreholes (more rarely in cased holes) after prior borehole casing perforation operations. In approximately 75% cases the cycle drill stem tests (DST) was used for testing the Upper Jurassic carbonate rocks. On the basis of data and experiences obtained during exploration of the Upper Jurassic carbonate rocks the model of the work-flow decision diagram was elaborated. It may be used for the integrated HC field management and for possible modifications in the drilling and testing technology.
The impact of using project based learning in Natural Gas Engineering
(2013) Duşe, Dan Maniu; Duşe, Carmen
This paper sets out to present an application of learning by cooperation in a bachelor study program of Natural Gas Engineering. Starting from the idea that students' abilities to understand new things are enhanced when they are tied to significant problem solving tasks and students are helped to understand why, when and how these facts become relevant competencies, we have organized the didactic activities of the last study year of the bachelor level, specializing in Natural Gas Engineering, using the projects method. The goal was to see how students perceive the efficiency of learning by applying this method and if an increase in learning efficiency has been noticed. Having these goals in mind, the students were organized into groups, each group having the task of presenting a project with a certain theme. Inside the group, roles were cast and then the strategy for doing the project was discussed. The research was done over a period of 3 semesters. In the first semester, traditional teaching was used, while the second and third semesters were dedicated to projects. In the traditional teaching part, students were encouraged to discover critical thinking methods. For this purpose, they were presented with the thinking hats method, the cube, the »I know - I want to know - I have learned« technique etc., but also methods to assist learning (mind map, cluster etc.). Doing the projects also involved presenting and defending them in front of the class, which has led to highlighting the pros and cons of the project. Also, students have received an evaluation questionnaire on evaluating key aspects during the presentation. Teamwork was evaluated by each student team member. The final evaluation of the students was comprised (in various proportions) by the contribution of the students during the semester (as a method of formative evaluation), as well as a final exam (summative evaluation). The general conclusion of applying this method highlights the fact that students have become aware of the pros and cons of their behavior, have gained new motivational support for learning and have managed to increase their performance in the field of Transporting Natural Gas.