Deng F.,China University of Petroleum - East China |
Deng J.,China University of Petroleum - East China |
Yang Y.,China University of Petroleum - East China |
Xu Y.,SIPO |
And 2 more authors.
SOCAR Proceedings | Year: 2013
Based on the statistical data of the oil sand control in Bohai Bay area, it is found that sand production in many oil wells is uncontrollable due to the indiscriminate use of high quality screen. This paper develops a gravel pre-packed sand control screen by combining the characteristics of present wire wrapped screen(WWS) and mesh screen(MS). Based on the statistical result of formation characteristics in Bohai Bay Basin, a large amount ofsand control simulation experiments are reported in this paper. Principally we analyse the characteristics of formations and drawdown pressure. The results show that: • Shale content has the biggest influence on the blockage of screen, when it ranges from 5% to 10%. The fluid productivity index per meter (FPIPM) of the former is 2.5 times higher than the latter with shale content equal to 10%. It is only a temporary solution to adjust the drawdown pressure for improving the production but this does not provide along term solution. • Sand control design methods of Tiffen, George Gillespie and Johnson have a lot of limitations with reasonable sanding of Bohai Bay. When the uniformity coefficient (UC) is greater than 5, fine grain content ≫5%, pre-packed screen can be used effectively in sand control. • When comparing the pre-packed screen and independent high quality screen commonly used in field, we find the pre-packed screen has a wider adaptability to the formation, so it can better meet the sand control requirements in the field.
Jiang K.,Beijing University of Chemical Technology |
Jiang K.,Sinopec |
Li C.,Sinopec |
Xie X.,Sinopec |
And 4 more authors.
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2012
A kind of star-type block butadiene-styrene resin was synthesized from butadiene and styrene monomer with a polymerization process featuring the mode of multiple feeding and multiple initiations. The haze of the resin increased as the termination agent dosage augmented when the polymerization system kept the same water content. The appropriate molar ratio of the termination agent to n-butyl lithium should be in the range of (0.6-0.7):1.0 in case of taking the color and haze of the resin specimen into account simultaneously. The light transmittance of the resin increased with the rise in the number average molecular mass (M n) of polystyrene chain formed in the secondary feeding of the styrene monomer. The light transmittance was over 90.0% when the M n was 0.95 × 10 4. The elongation at break of the resin was rather low if the M n was either less than 0.75 × 10 4 or higher than 1.30 × 10 4. The elongation at break exceeded 300% when the M n reached about 0.95 × 10 4, which endowed the resin with excellent toughness. The elongation at break of the resin assumed an ascending tendency as the coupling agent dosage reduced.
Zhang W.,China University of Mining and Technology |
Cui X.,China University of Mining and Technology |
Li D.,SIPO |
Zhang L.,China University of Mining and Technology
Procedia Environmental Sciences | Year: 2011
Case study of Korea, Low carbon energy efficiency labeling schemes (Energy Efficiency Label and Standard Program, High efficiency Appliance Certification Program, e-Standby Program) play a key role in carrying out the energy efficiency improvement policy in the appliances and equipment sector in Korea. Korea operates these Programs in an effort to improve energy efficiency in appliances and equipments. Mandatory energy efficiency standard which bans production and sales of low energy efficiency products which fall below the minimum energy performance standard. Ministry of Knowledge of Economy (MKE) and Korea Energy Management Corporation (KEMCO) is the key organizations in implementing energy efficiency standards and labeling. National energy efficiency efforts can be realized through energy efficiency improvements with the successful implementation of an energy efficient appliances dissemination policy and the phase out of low efficiency appliances. Through the implementation of the Energy Efficiency Label and Standard Program (1992), High-efficiency Appliance Certification Program (1996) and e-Standby Program (1999), significant energy efficiency improvements have been achieved, and 1.37 billion USD worth of energy savings. © 2011 Published by Elsevier Ltd.
Li H.,Shijiazhuang University |
Yang C.,CAS Wuhan Institute of Rock and Soil Mechanics |
Li B.,Shijiazhuang University |
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2016
In order to investigate the characteristics of ultrasonic wave velocity and acoustic emission activity of salt rock under triaxial loading, the multi-level cycle loading tests were conducted using a device composed with the acoustic wave and acoustic emission testing systems. The variations of ultrasonic wave velocity and AE number of salt rock were consistent with the loading stress. In the loading process, the ultrasonic wave velocity increased and AE activity was intense. However, there were opposite characteristics when the stress was unloading. The higher level the loading stress was, the more significant the feature was. The loading level of the confining pressure had great influence on the ultrasonic wave velocity and acoustic emission activity. The rate of change of the ultrasonic wave velocity was greater and the AE events were more under the lower confining pressure than when the confining pressure were in a higher loading level. This can be explained by the principles of confining pressure densification. In the paper, the unloading modulus, the fracture density and the ratio of Felicity were used respectively to express the damage evolution for salt rock. Results showed that the features of fracture density and the ratio of Felicity had a good consistency with the salt rock damage, which reflected the process of damage fracture well. Because of the plastic deformation, the unloading modulus was not suitable for describing the damage. © 2016, Science Press. All right reserved.
Huang J.,Zhejiang GongShang University |
Li Y.,SIPO |
Yin F.,Zhejiang GongShang University |
Zhao M.,Zhejiang GongShang University |
And 5 more authors.
Chinese Journal of Sensors and Actuators | Year: 2013
The method for storage time prediction of chilled-stored tilapia was explored by electronic nose combined with physical and chemical examination. According to national standard, pH and total volatile base nitrogen (TVBN) was examined. Electronic nose responses to the samples were measured. Principal component analysis (PCA) and stochastic resonance (SR) analysis were conducted on electronic nose measurement data. Compared with PCA result, SR output signal-to-noise ratio (SNR) discriminated storage time of tilapia samples qualitatively and quantitatively. Tilapia freshness threshold is -61.1688 dB according to TVBN national standard. Tilapia storage time predicting model was developed using SR SNR eigen value linear fitting regression. The predicting coefficient was R2=0.910. Validating experiment results demonstrated that this model presented good predicting accuracy. This method is promising in aquatic product quality analysis applications.