Gel Breaking Affecting Factors Analysis on Polymer Bio-Degradation

Cai, Ji Hua; Gu, Sui; Liu, Hao

doi:10.4028/www.scientific.net/AMR.550-553.1369

Paper Titles

Oriented Immobilization of Penicillin G Acylase on the Epoxydized Magnetic Hydroxyl Particles by Phenyl Acetic Acid
p.1345

Studies on Antioxidant Activity of Cherry Tomatoes Wine
p.1352

Studies on Wheat Resistant Starch by NMR Technique
p.1357

Microbial Prevention of Wax Deposition in Crude Oil
p.1364

Gel Breaking Affecting Factors Analysis on Polymer Bio-Degradation
p.1369

Preparation and Characterization of Glucose Liposome by Supercritical Reverse Phase Evaporation Method
p.1374

Chemical Constituents of Boehmeria macrophylla Hornem
p.1378

The Preparation of a Hyper-Thermostable Whole-Cell Biocatalyst and its Application for Biosynthesis of Biodiesel
p.1381

Investigation on Adsorption of Ni²⁺ by Special Microorganisms
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HomeAdvanced Materials ResearchAdvances in Chemical Engineering IIGel Breaking Affecting Factors Analysis on Polymer...

Gel Breaking Affecting Factors Analysis on Polymer Bio-Degradation

Abstract:

Recent years have witnessed a renewed interest in the development of coalbed methane (CBM) reservoirs. However, horizontal drilling in unconsolidated and soft coal seam for CBM drainage and exploitation often results in wellbore instability. This paper proposed degradable drilling fluid in CBM horizontal drilling which not only can maintain wellbore stability, but also minimize formation damages caused by drilling fluid. Its factors of gel breaking ratio were systematically studied from the aspects as substrate concentration, pH, temperature, enzyme concentration and reaction time. We found that in a condition when enzyme concentration is abundant, increasing of substrate concentration would result in higher gel breaking ratio. Furthermore, nearly neutral pH (pH≈7), moderate temperature (40°C~60°C), enzyme with higher concentration and longer action time (more than 3 hours) could enhance gel breaking ratio.

Info:

Periodical:

Advanced Materials Research (Volumes 550-553)

Main Theme:

Advances in Chemical Engineering II

Edited by:

Zili Liu, Feng Peng and Xiaoguo Liu

Pages:

1369-1373

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.550-553.1369

Citation:

J. H. Cai et al., "Gel Breaking Affecting Factors Analysis on Polymer Bio-Degradation", Advanced Materials Research, Vols. 550-553, pp. 1369-1373, 2012

Online since:

July 2012

Authors:

Ji Hua Cai, Sui Gu, Hao Liu

Keywords:

Degradation, Enzyme, Gel Break, Polymer

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Price:

$38.00

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References

[1] Mohaghegh SD, Nunsavathu UN, Jalal J, et al. 2005; SPE 98011.

[2] Maricic N, Mohaghegh S, Artun E. SPE Reservoir Evaluation & Engineering 2008; 11(6): 976-983.

[3] Su XB, Wang LP. Proceedings of New Progress of Coalbed Gas Geology 2001; 220-223.

[4] Rao MY, Yang LW, Feng SL. Special Oil & Gas Reservoirs 2005; 12(4): 2.

[5] Yuan L. China Coal 2007; 33(5): 5-7.

[6] Zhang Q. China Coal 2007; 33(11): 9-11.

[7] Baltoiu LV, Warren BK, Natras TA. SPE Drill Completion 2008; 23(3): 250-257.

[8] Barr K. 2009; SPE 123175.

[9] Beall BB, Tjon-Joe-Pin R, and Brannon HD. 1997; SPE 38570.

[10] Tjon-Joe-Pin R, Brannon HD, Rickards AR. 1993; U.S. Patent 5247995.

[11] Cai JH, Wu XM, Gu S, et al. Journal of Southwest Petroleum University (Science & Technology Edition) 2010; 32(5): 126-130.

[12] Cai Ji-hua, Liu Hao, Chen Yu, et al. Journal of China Coal Society 2011; 36(10): 1683-1688.

Paper TitlePages

Test Study on the Multi-Pulse Loading Fracturing Technology for Development of Shallow CBM

Authors: Jin Jun Wu, Xiao San Chu, Li Cai Liu, Guo Hua Zhao

Abstract: In China, the coal gas formation is characterized as low permeability, low pressure and low water saturation. The coal bed methane (CBM) has strong adsorption and is difficult to develop. Hydraulic fracture is currently the main measure to improve its permeability, drain the liquid and lower the pressure, which promotes desorption of CBM. But it is not efficient. Based on the principle of high energy gas fracturing (HEGF) and the study of new methods, we proposed the test application of the multi-pulse loading fracturing technology for development of shallow CBM. The mechanism of the technology is that it generates high-temperature and high-pressure gas in the target coal bed to produce a long multi-fracture system with effects of multi-pulse loading. It can also produce strong impulse oscillation acting on formation matrix to loose formation pressure, improve the pore connectivity and permeability of coal bed, which promotes pressure drawdown and desorption of CBM. Thus, the goal of increasing the yield of CBM wells is achieved. This paper focuses on the research ideas, mechanism, process design and feasibility. We carried out analysis combined with field test applications. The study provides a new direction to explore new technologies for China’s CBM development.

212

Summary on the Technology of Coalbed Methane Exploitation

Authors: Jie Chen, De Yi Jiang, Xi Yuan, Ping Guo, Hu Qing

Abstract: Coalbed methane (CBM) is a clean energy, especially the grim situation of the current international rapid economic development, the growing shortage of energy, environmental pollution and mine safety, making the production of CBM effective rational exploitation became more urgent important. This article describes the current technology of CBM exploitation, and comments the advantages and disadvantages of the main CBM exploitation methods. And it is also introducing several new techniques and the most development potential of the CBM exploitation method. It will provide a useful reference for the sustainable development of China's CBM exploitation.

747

Effect of Coal Dust on Coalbed Methane Wells Productivity

Authors: Hong Ze Ma

Abstract: CBM has the largest reserve except for conventional natural gas and is the cleanest energy. However, neither coal seam permeability nor CBM vertical well productivity has been determined when the immigration of coal dust are considered, which restricts the economic CBM exploitation. Based on coal seam characteristics, use permeability parallel path model and CBM seepage equation. The results show that with different ratio of non-clogging path and the total path, coal seam permeability and CBM vertical well productivity may either increase or decrease.