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Wang X.,Sulige Gas Field Research Center | Wang H.,Sulige Gas Field Research Center | Gan Q.,Gas Technology Institute | Wang H.,China National Petroleum Corporation | Zhang W.,China National Petroleum Corporation
Well Testing | Year: 2011

The weighing method is utilized to weigh the weight of the tubing string in the liquid at the wellhead and precisely and continuously determine the liquid level in the wellbore with accumulated liquid, which provides a basis of effective liquor drainage of gas wells. Two examples show that the weighing method can fast and accurately determine the accumulated liquid level in the wellbore, which provides a reliable basis of effective liquor drainage of gas wells.

Hou D.,China National Petroleum Corporation | Xie Z.,China National Petroleum Corporation | Zhang H.,China National Petroleum Corporation | Sun H.,China Central Depository & Clearing Co., Ltd. | And 2 more authors.
Well Testing | Year: 2011

Ordos region of northern Shaanxi-He8 reservoir of Gaoqiao area has feature of low pressure and low permeability, sand body of which is overlaid multi-layer from north to south and linked in lace better horizontally. The main fracturing for reservoir is a longer hydraulic fracture to form certain conductivity. Based on analysis for geological features and fracture effect of Ordos region of northern Shaanxi Gaoqiao area, the best parameters of fracturing reform are summed up. Finally, a reasonable proposal about technical development for modification of tight sandstone of gas reservoir is suggested which has a more practical reference sense for following-up exploration and development to this kind of reservoir.

Liang Y.,Sulige Gas Field Research Center | Yuan K.,Sulige Gas Field Research Center | Yin T.,Sulige Gas Field Research Center | Wu F.,No.3 Gas Recovery Factory
Well Testing | Year: 2011

Using the numerical well test simulation method, a numerical well test model of fractured horizontal wells has been established. Simulation analysis of the pressure-production character of fractured horizontal wells is carried out considering various productivity-influencing factors. Based on the simulation analysis results, the nondimensional IPR recovery percent curve is drawn. By the statistics and regression analysis of the IPR curve, the IPR productivity evaluation formulation of fractured horizontal wells is given, which applies a simple, convenient and fast method for productivity evaluation of fractured horizontal wells in low permeability gas reservoir.

Li Y.,Sulige Gas Field Research Center | Zhao Y.,Sulige Gas Field Research Center | Yang R.,Shandong University of Science and Technology | Fan A.,Shandong University of Science and Technology | Li F.,Sulige Gas Field Research Center
Mining Science and Technology | Year: 2010

Given sustaining exploration, the eastern zone of the Sulige gas field may soon become a key area of exploitation. In order to explore its genesis, types and distribution of the reservoir sandstones in the eastern zone of this gas field, we focused in our study on the provenance and detailed sedimentary facies of sandstone of the He8 (the eighth part of the Shihezi formation, Permian system) and Shanxi1 (the first part of the Shanxi formation, Permian system) members, based on core observations, analyses in petrography, granularity and logging. The results show that: 1) the sandstone provenance of Shanxi1 and He8 in the eastern zone of the Sulige gas field is from the north of the Ordos Basin, characterized by dual directions from the north and northeast. 2) The He8 and Shanxi1 members were deposited in a fluvial-delta sedimentary system. The He8 was mainly deposited in braided rivers, including braided channels, channel bars, levee and floodplain sub-environments, whereas the Shanxi1 Member was deposited in braided rivers and deltas, including braided channels, channel bars, floodplains, tributaries and inter-tributary sub-environments. 3) Sedimentary facies bands migrated in drastic fashion towards the basin from the Shanxi1 to the He8 Member. Base levels of sedimentation generally present a trend of small increases in-amplitude, large decreasing amplitudes and slow and gradual Increases. 4) The continuity of the reservoir sandbodies along the source direction is better than that perpendicular to the direction. Compared with Shanxi1, both dimensions and continuity of the sandbodies in He8 are better from which we conclude that it is the most favorable part of the reservoir. © 2010 China University of Mining and Technology.

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