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Yang F.,China National Petroleum Corporation | Yang F.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Wang X.,China National Petroleum Corporation | Wang X.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Peng B.,China University of Petroleum - Beijing
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2015

Pre-crosslinked polyacrylamide dispersion (PCPD) was prepared by dispersion polymerization in high salt concentration aqueous media. Effects of the mass concentration, the crosslinked ratio, the laying temperature and the concentration of salt on the plugging properties were studied systematically through membrane filtration measurement. The results showed that PCPD with the mass concentration of 150 mg/L could plug the membrane of aperture of 1.2 μm even effectively under the pressure of 50 kPa. With the increase of PCPD mass concentration, the plugging performance became better. With increase of the crosslinked ratio, the plugging performance weakens. PCPD had good stability, which could form effectively plugging for micro-porous membrane under 45℃ for 30 d or under 90℃ for 15 d. Also, PCPD had excellent resistance to bivalent salts. ©, 2015, Science Press. All right reserved.


Liang H.,Xian Shiyou University | Xu J.,Xian Shiyou University | Zhu D.,Xian Shiyou University | Wei Y.,Gas Technology Institute | And 4 more authors.
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

In this paper, the laws of the vortex flow applied to liquid unloading in gas wells were researched. The mathematical model of vortex-flow tools draining process was established to study the swirl flow field introduced by the spiral of the tools. The numerical simulation Fig.d out the flow field structure, the characteristics of gas-liquid spiral vortex flow and the variation of spiral flow intensity. The research results indicated that, the gas-liquid two-phase turbulent flow was transformed into kind of annular flow by vortex tools, and the continuous gas column moved up in the center of the wellbore, and the liquid membrane moved upward helically along the wall. The vortex flow structures reduce the friction and improve the liquid carrying capacity of the gas. © Sila Science. All rights reserved.


Yang H.,Petrochina | Yang H.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Liu X.,Petrochina | Liu X.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Yan X.,Petrochina
Earth Science Frontiers | Year: 2015

Ordos Basin dominantly developed tight sandstone gas reservoirs in the Upper Paleozoic, with great exploration potential as large geological reserve, more than 5 trillion m3. By analyzing the tectonic evolution history of the basin, combined with inclusion thermometry, zircon U-Pb dating and authigenic illite K-Ar dating etc., it is defined that the controlling role on Upper Paleozoic tight sandstone gas reservoir is the tectonic evolution since the Late Paleozoic. Studies have shown that sedimentary palaeotopography was gentle and tectonic subsidence was slow during the Carboniferous-Permian, which formed source rocks and sandstone reservoir with great extent. During the Triassic-Middle Jurassic, sedimentation became rapid with significant compaction and siliceous cementation. Along with strong water-rock interaction, tight sandstone reservoir began to occur. Intensive tectonic activities with the occurrence of thermal tectonic events made a large number of natural gas generated and migrated to accumulate during the Late Jurassic-Early Cretaceous, which resulted in forming tight gas reservoir. From the Early Cretaceous to present, some natural gas was lost, and lots of low-pressure gas reservoirs have formed due to stratum uplift and denudation. ©, 2015, The Editorial Office of Earth Science Frontiers. All right reserved.


Yang H.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Yang H.,Petrochina | Niu X.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Niu X.,Petrochina | And 4 more authors.
Earth Science Frontiers | Year: 2015

Tight sandstone has been an important field of exploration and development of oil and gas in China recently. The tight sandstones of Chang 7 Formation of Longdong area in Ordos Basin mainly developed into braid deltas and gravity flow sedimental sand bodies. And the latter has great potential in exploration and development. On the basis of research of regional structure, paleoclimate, ancient landform and sedimentary systems, we applied the technology of sedimentary simulation to recreating the formation processes and main controlling factors of the researched area, the Chang 7 Formation. Under laboratory conditions, sedimentary facies of semi-deep to deep lakes are mostly sandy debris flow, turbidite and deep lake mud. The experimental research indicates that the main controlling factors to impact the formation and evolution of gravity flow sedimental sand bodies are: (1)sediment concentration (decides the sediment type of gravity flow); (2)the shape of the bottom of a lake basin (controls the distribution of sand body of gravity flow); (3)the lake stage and flow rate (decide the sedimentary thickness and the scale of gravity flow); (4)the intersection of various sources (decides the transverse connection of gravity flow). Also, by analyzing and comparing the results of the experiment, we predicted the areas with favorable reservoir distribution. We combined the original geological model of Longdong area with the results of the simulated experiment and established the sedimentary pattern of Chang 7 Formation of the Triassic in Longdong area under the condition of sedimentary simulation experiment. ©, 2015, The Editorial Office of Earth Science Frontiers. All right reserved.


Shang Y.,Xian Changqing Technology Engineering Co. | Xiao S.,Gas Technology Institute | Xiao S.,National Engineering Laboratory for Exploration and Development of Low Permeability Oil Gas Fields | Qiu X.,Gas Technology Institute | And 3 more authors.
Chemical Research in Chinese Universities | Year: 2015

The influence of Cr on the electronic properties of the passive film on B30 alloy in NaOH solution was studied via electrochemical impedance spectra(EIS), potentiodynamic curve and Mott-Schottky plot. The Cr doped in the passive film on B30 alloy was detected by X-ray photoelectron spectroscopy(XPS). XPS results show that Cr2O3 appeared on the passive film, which implied the enhanced anti-corrosion of B30 alloy. The passive film showed a p-type semi-conductive character. The acceptor density(NA) was in an order of magnitude of 1022 cm−3, and NA decreased with the increment of Cr. EIS results show that the film resistance(Rf) increased with increasing the amount of Cr. The diffusion coefficient(D0) was calculated to be in a range of 10−16−10−17 cm−2/s on the basement of point defect model(PDM). © 2015, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.

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