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Jiang G.C.,China University of Petroleum - Beijing | Zhang M.,Geology Scientific Research Institute of Shengli Oilfield | Xie S.,China National Petroleum Corporation | Yang Z.,China University of Petroleum - Beijing | And 2 more authors.
Petroleum Science and Technology | Year: 2014

Gas-well production will be increased greatly after altering the wettability of porous media from preferential liquid-wetting to preferential gas-wetting in gas-condensate reservoirs. Moreover, the degree of gas wetness strongly affects the production. Thus, the study of gas-wet quantitative measurement methods is of great significance. The wetting ability parameter of gas versus liquid ζG-L is calculated from the proposed formula in the sessile drop method, and the gas contact angle θ G in the captive bubble method was separately used to measure gas wettability and propose the wettability criteria. Also, the concept of gas wettability was defined. After treated by fluorocarbon polymer (Zonyl8740), glass slides, and glass capillary tubes got tested on gas wetness. The results show that with the increase of the concentration of Zonyl8740 solution, the surface free energy of glass slides decreases and gas-wetness of them is enhanced. And capillary tube rise tests showed the same conclusion, demonstrating the rationality and applicability of quantitative methods. © 2014 Taylor and Francis Group, LLC. Source


Xie S.X.,China National Petroleum Corporation | Jiang G.C.,China University of Petroleum - Beijing | Chen M.,China University of Petroleum - Beijing | Li Z.Y.,China University of Petroleum - Beijing | And 3 more authors.
Petroleum Science and Technology | Year: 2014

Oil resources are abundant in the offshore area that is an important channel for the human to obtain oil and gas. With oil exploration and development, the marine ecological environment has been influenced increasingly. Through a large number of laboratory tests, the evaluation indexes of the environmental offshore drilling fluid system were established, which are consisted of heavy metal, petroleum, acute biological toxicity, biodegradability, and so on. Four types of agents for environmental offshore drilling fluid and a novel environmental offshore drilling fluid system were developed on the basis of establishing the evaluation indexes. The basic formulation of the novel drilling fluid system is: 400 mL Seawater + 0.3% Na2CO3 + 0.2% NaOH + 4% Bentonite +0.5% HXB-1 + 2% MMF + 1.5% SDR-30 + 1%HXJ + 1% SDE-1 + 2%NFA-25, and the system has been applied successfully to Bohai Bay in Shengli oil field. The results showed that the environmental offshore drilling fluid system had favorable drilling performances, met the requirements of drilling engineering and marine environmental protection, and realized the source control of the environmental contamination from offshore drilling, the environmental performances of which were superior to sulfonated polymer drilling fluid and oil-based drilling fluid. © 2014 Copyright Taylor & Francis Group, LLC. Source


Zhang L.,Geology Scientific Research Institute of Shengli Oilfield | Xu X.,Geology Scientific Research Institute of Shengli Oilfield | Liu Q.,Geology Scientific Research Institute of Shengli Oilfield | Kong X.,Geology Scientific Research Institute of Shengli Oilfield | Zhang S.,Geology Scientific Research Institute of Shengli Oilfield
Petroleum Exploration and Development | Year: 2011

Using geochemistry, sedimentary and petroleum geology methods, and based on the analysis of spatial distribution of deep source rocks and sedimentary organic facies, the favorable exploration prospects in the Jiyang Depression, Shengli Oilfield are studieded. There are 4 types of sedimentary organic facies (including anoxic organic facies, anaerobic organic facies, dysaerobic organic facies and aerobic organic facies) in deep source rocks of Kongdian Formation - Sha-4 Member, Paleogene. The source rocks of Anoxic facies and anaerobic facies are discovered in the Sha-4 Member and are proved as excellent source rocks, while the Kongdian Formation source rocks compose mainly of the dysaerobic facies and aerobic facies and served as common source rocks. The whole hydrocarbon expulsion process is divided into 3 stages, including free water expulsion, hydrocarbon generation and energy accumulation, and hydrocarbon expulsion from microfractures. The hydrocarbon expulsion from deep source rocks mainly occurs in the stage of hydrocarbon expulsion from microfractures, during which there are three oil and gas migration modes with different geologic conditions, including vertical migration, lateral migration and downward migration. The studies indicated that the hydrocarbons in shallow and medium formations from the Sha-4 Member excellent source rocks of anoxic and anaerobic facies are mainly accumulated through vertical migration along the faults, while the reservoirs formed by lateral migration and downward migration are still waiting to be revealed. So there is great exporation potential for the deep Paleogene of the Jiyang Depression. © 2011 Research Institute of Petroleum Exploration & Development, PetroChina. Source

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