China University of Petroleum

About: China University of Petroleum is a education organization based out in Beijing, China. It is known for research contribution in the topics: Catalysis & Oil shale. The organization has 39802 authors who have published 39151 publications receiving 483760 citations. The organization is also known as: Zhōngguó Shíyóu Dàxué & China University of Petroleum (Beijing).

Evaluation of Acid Fracturing Treatments in Shale Formation

Abstract: Hydraulic fracturing by stimulated reservoir volume (SRV) is a necessity to realize commercial development of shale gas, and its stimulation mechanism still needs further study, and the effectiveness of supplementary stimulation measures needs further exploration. The shale always contains some carbonate minerals. This paper tests the permeability of acid-etched fracture in shale to explore the influence of carbonate mineral content, acid fluid types and concentration, fracture plane roughness, proppant, and confining pressure on the acid-etched effects in shale, and uses CT scanning to conduct research on variation of microscopic pore-throat texture in shale before and after acid-etching. The test shows that the roughness of the fracture plane perpendicular to the bedding plane is higher than the roughness of that paralleled to the bedding plane, and the roughness in both fracture planes perpendicular to and paralleled to the bedding plane increases as the carbonate minerals content increases. In same gr...

Effect of Chromium on the Pitting Resistance of Oil Tube Steel in a Carbon Dioxide Corrosion System

Abstract: Pitting corrosion and structure characteristics of carbon dioxide (CO2) corrosion products on N80, 1Cr, and 4Cr steel were studied. The results indicated that Cr-containing steels can suppress pitting corrosion effectively. While the Cr content in the matrix reached 4%, no pitting corrosion appeared on 4Cr steel. Cr existed mainly as amorphous compound Cr(OH)3 in corrosion products. With the improvement of Cr content in the steel matrix, the content of Cr(OH)3 in corrosion products increased remarkably, which could not only reduce the electrical conductivity of corrosion products but could also improve the cation selectivity of corrosion products. These two factors could improve the pitting resistance of Cr-containing steels.