Chengdu, China
Chengdu, China

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Zhang G.,Southwest Petroleum University | Bai Y.,Southwest Petroleum University | Chen K.,Downhole Operation Branch | Zhang X.,China National Petroleum Corporation | Gao P.,Southwest Sub Company
Well Testing | Year: 2011

Northeastern Sichuan gas field is a gas marine carbonate rock, generally has features of high temperature, high pressure, corrosive acid gas of hydrogen sulfide and carbon dioxide, acid gas (H2S, CO2) reservoir has serious corrosion to the testing facility which does not meet the high pressure gas production and testing needs. Based on the highest wellhead shut-in pressure, partial pressure for corrosion, wellhead flow temperature forecasts, the well head of appropriate pressure level, temperature type, specification level, materials type and performance level at Puguang region, the dam blocks and Yuanba region should be determined, which provides the basis for optimizing the wellhead for high-temperature, high pressure, high-sulfur gas well.

Wang X.,Southwest Petroleum University | Zhang R.,Southwest Sub Company | Li C.,Southwest Petroleum University | Bo Z.,Petrochina
Natural Gas Industry | Year: 2012

The expandable tubular technology is one of the core technologies in oil drilling and production sector in the 21" century. The essential of the expandable tubular material selection is to know how the change of mechanical performance like the permanent plastic deformation occurs when the expandable tubular is under radial expansion. In view of this, expansion tests were thus conducted on the J55 casing (0114. 3 mm), which was expanded by an expansion mandrel from top to bottom. The mechanical properties of the casing radially expanded by 9. 3% were measured and compared with those before the expansion. The results indicate that the length of J55 casing is decreased by about 4. 4%, the wall thickness reduced by 6%, and the degree of inhomogeneous deformation aggravates. Due to the work hardening, the Rockwell hardness and tensile strength of the casing increase, but its elongation and shrinkage on cross section both decrease to different degrees; however, all indexes can meet the requirement of the API SPEC 5CT standard. Furthermore, the SEM fracture surface indicates that the ductile fracturing occurs on J55 casing before and after the expansion. The dimples on the fracture surfaces of expanded J55 casing are small and shallow, and in uneven distribution; the fracture surfaces are smoother than the ones without expansion. This test will provide reference for the selection of expandable tubular materials, quality control in casing manufacturing, and the actual application in fields.

Hu W.,Southwest Sub Company | Wang J.,Southwest Sub Company | Hu D.,Southwest Sub Company | Ma H.,China University of Petroleum - East China
Natural Gas Industry | Year: 2010

The total length of the Line Two of West-East Natural Gas Transmission Project is 8000 km starting west from Horgos (west of Xinjiang), east to Shanghai, south to Guangzhou and Hong Kong. It is a milestone in the history of Chinese long-distance oil and gas transportation pipeline construction. Over 60 tunnels have been built under complex geological conditions along the line. Therefore, through an analysis of a variety of advanced geological forecast methods, including the TSP203 advanced geological forecast instrument, advanced borehole, IR water detecting and geological sketching, etc., together with the engineering practices, a comprehensive advanced geological forecast technical system was established in the tunnel construction process. The system provides a robust technical support for making the construction plan, speeding up the construction progress, and ensuring the construction safety. The implementation process of the technical system was presented. It was characterized by a combination of the short and long distance geological prediction, geophysical prospecting, and drilling. It reduced the construction period and greatly saves the project cost. It had favorable application value.

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