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Zhou T.-Y.,National energy 2 capture and storage research and development center | Zhou T.-Y.,State Key Laboratory of EOR | Zhou T.-Y.,Petrochina
Advanced Materials Research | Year: 2013

According to laboratory physical simulation methods, Achieve the infiltration experiment of overheated steam in the porous medium. The experiment researched overheated steam's improvement to damage and undamaged porous mediums. Permeability was increased 1 to 4 times in the damaged porous mediums, 3 to 6 times in those undamaged. The microstructure of porous medium is characterized by scanning electron microscope photos. A lots of mineral microcrystal adhered on the initial rock particle surface. After the infiltration experiment of overheated steam, mineral microcrystal decreased obviously, and the rock particle surface changes into even and smoothly, which made the filtration resistance precipitous declined. Based on theory assumptions, production calculation formulas were derived in some given conditions. And the regular pattern plate map out, which affected by overheated steam heating radius and water-damaged radius. The results turns out that, inject overheated steam can achieve obviously production increasing. © (2013) Trans Tech Publications, Switzerland. Source


Xulong W.,Petrochina | Mengjun Z.,Petrochina | Mengjun Z.,State Key Laboratory of EOR | Mengjun Z.,China National Petroleum Corporation | And 6 more authors.
Petroleum Exploration and Development | Year: 2010

Natural gas in the Ludong-Wucaiwan area is characterized by typical source-controlled reservoirs. Combining outcrop data, well data and seismic data, this article makes a systematic research and evaluation on the abundance, type, and maturity characteristics of the Carboniferous source rocks in the Ludong-Wucaiwan area. The Carboniferous source rocks are dominantly dark grey and grey mudstones, secondarily tuffs, carbonaceous mudstones, silty mudstones and coals. The source rock abundance of the Upper Carboniferous Batamayineishan Formation (C 2b) is higher than that of the Lower Carboniferous Dishuiquan Formation (C 1d), while the kerogen type of the Lower Carboniferous source rock is better than that of the Upper Carboniferous. The maturity center of the Carboniferous source rocks is located in the west part of Dinan uplift to the Wucaiwan depression area, with maturity decreased towards south and north. The distributions of the Carboniferous source rocks and volcanic rocks are complementary. The source rocks are distributed in zonal shape in east-west direction, and are most developed in the west part of the Dinan uplift and its southern area. © 2010 Research Institute of Petroleum Exploration & Development, PetroChina. Source


Pingping S.,State Key Laboratory of EOR | Pingping S.,Petrochina | Xinglong C.,State Key Laboratory of EOR | Xinglong C.,Petrochina | And 2 more authors.
Petroleum Exploration and Development | Year: 2010

In the initial period of CO2 flooding, formation pressures of reservoirs do not increase noticeably. Physical simulation experiments were designed to study this phenomenon. In the 1-D infill-sand model, it was found that, under the same pressure conditions, the densities of distilled water, salt water and crude oil increased with CO2 dissolution, and then reached stability. By the volume decrease calculation of the liquid and the distilled water dissolution experiment, it was confirmed that the effects of CO2 dissolved in oil and water are the main reasons for any pressure decrease. In the 2-D sand plate model, injection pressure also decreased. By analyzing production PV (pore volume) and injection PV curves, it was found that the main reason for the pressure decrease is that the injected CO2 can flow into the minute pores that are unavailable to oil and water, and comparatively speaking, dissolution of CO2 can be neglected. The result is also proven by porosity calculations and CO2 flooding experiments using different production control methods and by using carbonate cores. © 2010 Research Institute of Petroleum Exploration & Development, PetroChina. Source


Wang G.,State Key Laboratory of EOR | Wang G.,Petrochina | Wang G.,National Energy Co 2< Inf> Flooding And Storage Experiment nter | Zheng X.,Petrochina | And 8 more authors.
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | Year: 2015

Since the existing gas flooding reservoir screening criteria lack economic indexes reflecting future dynamic production performances, indexes reflecting economic profits are added into the exiting criteria (related single well production indexes) to form a new method of selecting low permeability reservoirs suitable for CO2 flooding. Reservoir engineering methods of single well peak oil production rate (OPR) prediction for gas drive tight reservoirs is given by employing the concept of "OPR multiplier due to gas flooding". Based on the technical economics principles, the method calculating the economical limit OPR of CO2 flooding is also presented. On this basis, a new screening criterion of reservoirs suitable for CO2 flooding is proposed: if the peak OPR predicted by reservoir engineering method is higher than the economic limit OPR, the target reservoir is suitable for CO2 flooding. Furthermore, a four-step reservoirs screening method is advanced: technical screening, economic screening, feasibility evaluation, recommendation of optimal gas flooding blocks. The new screening criteria were applied to evaluate the CO2 flooding potential of seventeen blocks in an oilfield, which ended up with only 32.4% of the geologic reserves from conventional method suitable for CO2 flooding. It is recommended blocks suitable for CO2 flooding be selected according to the new criterion to ensure economic success. ©, 2015, Science Press. All right reserved. Source


Wang G.,State Key Laboratory of EOR | Wang G.,Petrochina | Wang G.,National Energy 2 Flooding and Storage Experiment R and nter | Zheng X.,Petrochina | And 8 more authors.
Petroleum Exploration and Development | Year: 2015

Since the existing gas flooding reservoir screening criteria lack economic indexes reflecting future dynamic production performances, indexes reflecting economic profits are added into the exiting criteria (related to well oil production rate) to form a new method of selecting low permeability reservoirs suitable for CO2 flooding. Reservoir engineering methods of average well peak oil production rate prediction for gas drive is given by employing the concept of "Oil production rate multiplier due to gas flooding". Based on the principles of technical economics, the method calculating the economical limit well oil production rate of CO2 flooding is also presented. On this basis, a new screening criterion of reservoirs suitable for CO2 flooding is proposed: if the peak well oil production rate predicted by reservoir engineering method is higher than the economic limit well oil production rate, the target reservoir is suitable for CO2 flooding. Furthermore, a four-step reservoirs screening method is advanced: technical screening, economic screening, fine feasibility evaluation, recommendation of optimal gas flooding blocks. The new screening criteria were applied to evaluate the CO2 flooding potential of seventeen blocks in an oilfield, which ended up with only 32.4% of the original oil in place from conventional method suitable for CO2 flooding. It is recommended blocks suitable for CO2 flooding be selected according to the new procedure to ensure economic success. © 2015 Research Institute of Petroleum Exploration & Development, PetroChina. Source

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