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Xiao S.Q.,Gas Technology Institute | Zhu D.Y.,Xian Shiyou University | Liu S.Q.,National Engineering Laboratory for Exploration
Applied Mechanics and Materials | Year: 2014

Existing hydraulic feedback pump from the structure type can be divided into three kinds, big on the small,small on the big,big up and down. This paper focuses on the inner-flow field of three structural pumps about oil import and export of analyzing and comparing the velocity field and pressure field, chooses more suitable for hollow sucker rod oil production of hydraulic feedback pump. © (2014) Trans Tech Publications, Switzerland. Source


Yang X.D.,Gas Technology Institute | Zhu D.Y.,Xian Shiyou University | Wei Y.M.,National Engineering Laboratory for Exploration
Applied Mechanics and Materials | Year: 2014

Aiming at the characteristics of the production in low permeability oil field, the pump efficiency mathematic model is built. Then the factors of affecting the pump efficiency are analyzed, which include the liquid production, diameter of pump, pump depth, immerse depth of pump, stroke and stroke per time, gas oil ratio, inclined angle of pump and discontinuous production efficiency. Through the theoretical calculation, the main factors of affecting the pump efficiency is determined, which are the liquid production, diameter of pump, stroke per minute, pump depth, inclined angle and discontinuous production efficiency. According to the calculation results, it can supply the theoretical foundation for the oil production. © (2014) Trans Tech Publications, Switzerland. Source


Yang H.,Petrochina | Yang H.,National Engineering Laboratory for Exploration | Deng X.,Petrochina | Deng X.,National Engineering Laboratory for Exploration
Petroleum Exploration and Development | Year: 2013

A large area of deep-water sandstone was formed under the combined action of delta and gravity flow in the central Ordos Basin during the depositional period of the Ch6 and Ch7 oil-bearing formations of the Yanchang Formation. According to U-Pb dating of zircons by the method of LA-ICP-MS, the ages of the tuff layers at the base and upper parts of the Ch7 oil-bearing formation are 228.2±6.0 Ma and 222.2±2.0 Ma, respectively. Based on the ages of the tuff layers, it is suggested that the gravity flow complexes at the middle-upper Ch7 and lower-middle Ch6 oil-bearing formations were formed 215 to 224 Ma. The timing of deposition of the tuff and gravity flow is roughly the same as the period when tectonics are most active in the Qinling area, i.e. middle Indosinian period. Therefore, the even, widespread tuff at the bottom of the Ch7 oil-bearing formation and the thick deep-water sandstone of the Ch6 oil-bearing formation deposited during an early lake regression period, are the direct outcomes of the tectonic event. Tuff layers are deposited under the influence of the middle Indosinian tectonic events, and the clastic composition of the top and base tuff layers vary greatly. The events control the formation of large-area deep-water depressions, change of depositional system, migration of the depo-center, and occurrence of gravity flows. © 2013 Research Institute of Petroleum Exploration & Development, PetroChina. Source


Yang H.,Petrochina | Yang H.,National Engineering Laboratory for Exploration | Liu X.,Petrochina | Liu X.,National Engineering Laboratory for Exploration
Petroleum Exploration and Development | Year: 2014

Based on practices of gas exploration and development in the Ordos Basin, this paper analyzes the controlling factors of large-scale accumulation conditions and distribution characteristics of coal-derived gas, and makes conclusions on the exploration progress of coal-derived gas based on present exploration situations. The approach has proven coal-derived gas reserves of 5.24×1012 m3 in the Ordos Basin. Twelve coal-derived gas fields have been found so far, mainly distributed in Upper Paleozoic Carboniferous-Permian clastic rocks and Lower Paleozoic Ordovician marine carbonate reservoirs. Tight sandstone gas reservoirs are developed in the Upper Paleozoic. The features of widely-distributed hydrocarbon-generation, interlayered with large-scale distribution of sandstones, where the reservoirs have become tight and followed by natural gas accumulation later, close range migration and efficient hydrocarbon accumulation, has resulted in a large area of distribution of tight sandstone gas zones. The Sulige large gas field has been found with proven coal-derived gas reserves of 3.49×1012 m3, and two large-scale gas reserve replacement fields have been developed and implemented in the eastern part of the basin and in the Longdong area. Marine carbonate gas reservoirs are developed in the Lower Paleozoic. Gas generated from overlying source rocks have migrate downwards and accumulated in Ordovician weathering crust karst and dolomite reservoirs. The Jingbian gas field was discovered, with proven coal-derived gas reserves of 7000×108 m3, meanwhile, several gas-rich regions have been found in the eastern side of the dolomite. © 2014 Research Institute of Petroleum Exploration & Development, PetroChina. Source


Xuefeng Q.,Petrochina | Xuefeng Q.,National Engineering Laboratory for Exploration | Lili L.,Petrochina | Lili L.,National Engineering Laboratory for Exploration | And 4 more authors.
Electronic Journal of Geotechnical Engineering | Year: 2014

Anbian region in Ordos basin is a typical tight reservoir. C7 reservoir in An83 well block has a low permeability, which generally lower than 0.1∼0.2mD, belonging to typical low tight sandstone reservoir. The reservoir heterogeneity and diagenesis are strong, as well as fractures are common development, the reservoir modeling is different form the high permeability sandstone reservoir. In order to develop the tight oil reservoir reasonably and effectively, the C7 reservoir in An83 was chosen as the typical area. A fine geological model was established of C7 in An83, including sedimentary facies, porosity, permeability, oil saturation and ntg model. Fractures model was the most important part among which. © 2014 ejge. Source

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