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Jiang Z.,Geological Scientific Research Institute of Shengli Oilfield | Huang G.,Sichuan University
Journal of Dispersion Science and Technology | Year: 2014

Partially cross-linked polyacrylamides (PCPAM) were prepared, and their rheological property, gel content, swelling property, and suspension property in saline solution were analyzed in laboratory. The goal of the research was to study the flow mechanism of PCPAM as a novel oil displacement agent in porous media. The migration behaviors of PCPAM were studied by single and series connection of double-tube sandpacked core flow experiments. The results showed that there was a critical pressure existing in the migration of PCPAM particles in porous media, and the migration was a dynamic process of plugging and flooding at the same time. When the pressure reached the critical pressure, the PCPAM particles would deform to pass through the pore throat and go ahead. Besides, the profile control experiments were conducted using a parallel connection of double-tube sandpacked core models, and the results revealed that PCPAM could generate "fluid diversion" and enlarge the swept volume of the lower permeable core. Moreover, micro-visualization displacement experiments were also carried out and proved that PCPAM could plug the high permeable pore throat to enlarge the swept volume, leading to an enhancement in oil recovery. © 2014 Copyright Taylor & Francis Group, LLC. Source


Zhang S.,China University of Petroleum - East China | Chen S.-Y.,China University of Petroleum - East China | Wu Z.-P.,China University of Petroleum - East China | Wang Y.-S.,Geophysical Research Institute of Shengli Oilfield | And 3 more authors.
Geology in China | Year: 2015

The sedimentary rocks from Kongdian Formation to the early period of the fourth member of Shahejie Formation in the western part of the south slope of Dongying Depression consist of a set of red beds mainly comprising red terrestrial clastic Sediments. Based on an analysis of applicability of erosion thickness with different restoration methods and a comparative evaluation of different methods for restoring erosion thickness, the authors have found that the tectonic cross section method can be mainly used to define the erosion thickness interval and eroding range of calibration, the mudstone acoustic time and deposition rate method is suitable for the identification of the numerical interval of erosion thickness, the acoustic interval transit time method is better than other methods in the area near the uplifted block of Linnan fault and Gaoqingpingnan fault, the optimization deposition rate method is better than other methods in Pingfangwang area, and the optimized porosity method is more accurate in the red layers, especially in the lower member of BS4 formation. The results from inclusion thermometry testing method and vitrinite reflectance method can only be regarded as the single well data points for reference. Source


Yang P.-J.,Geological Scientific Research Institute of Shengli Oilfield | Yang P.-J.,China University of Petroleum - East China | Pan Y.,Downhole Service Company of Shengli Oilfield | Mu X.,Geological Scientific Research Institute of Shengli Oilfield | Ren X.-D.,Gudao Oil Production Plant of Shengli Oilfield
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2010

The method of high-order statistics seismic wavelet extraction requires reflection coefficient to be non-gauss white noise and its extraction speed is slow. In order to overcome the shortcomings, a novel mixed-phase seismic wavelet extraction method for single input multiple output(SIMO)system by subspace method was presented. Quadratic objective function was built based on the orthogonality between a signal and a noise subspaces, and the seismic wavelets were extracted by optimizing the objective function. The reflection coefficient need not be made any assumption. So this method is totally different from high-order statistics wavelet extraction. The results of numerical simulation and application show that this method is characterized by high accuracy and good stability, and it is very suitable for the areas without well materials or reliable well materials. This method has wide application perspects. Source


Wang J.,Geological Scientific Research Institute of Shengli Oilfield | Li S.H.,Yangtze University | Shi F.L.,Coal Mine Exploration of Guizhou Province | Hu X.L.,Yangtze University
Advanced Materials Research | Year: 2013

Es2 8th sand group in Shengtuo oilfield is a typical braided river delta front deposition. Through depositional physical simulation, the development mode of mouth bar and its main controlling factors were summarized. Physical model and experiment scheme were set up according to similarity criterion and the depositional background in research area. One provenance and three times simulation was designed to simulate three single layers within Es2 8th sand group respectively. Development mode of mouth bar was summarized with three single mouth bars based on swing conditions of rivel estuary and two composite mouth bars according to whether they are developed at the same time. © (2013) Trans Tech Publications, Switzerland. Source


Cai G.,Guangzhou Marine Geological Survey | Cai G.,CAS Guangzhou Institute of Geochemistry | Guo F.,CAS Guangzhou Institute of Geochemistry | Liu X.,Geological Scientific Research Institute of Shengli Oilfield | Sui S.,Geological Scientific Research Institute of Shengli Oilfield
Geochemical Journal | Year: 2011

Major, trace element and Sr-Nd isotopic compositions of Cenozoic sedimentary rocks from the Dongying Sag and the Zhanhua Sag, Jiyang Depression, provide evidence for provenance evolution and paleogeographic reconstruction. Compared with the average composition of post-Archean Australian shales (PAAS), the Paleogene sedimentary rocks of Shahejie formation (Es) from the Dongying Sag have similar SiO2, Al2O3 contents, lower K2O, Na2O contents with K2O/Na2O ranging from 0.18 to 4.58, relatively lower contents of V, Cr, Co, Ni, Nb, Ta, Y, Rb, and Cs, and higher contents of Sr, Ba, Zr and Hf. All samples show chondrite-normalized REE patterns similar to that of PAAS, with significant light REE enrichment, flat heavy REE and negative Eu anomalies (Eu/Eu * = 0.71-0.99, average of 0.80). The Sr-Nd isotopic compositions of the Paleogene sedimentary rocks are different from those of the Neogene sedimentary rocks which generally have higher 87Sr/ 86Sr and lower 143Nd/144Nd. In the geochemical discrimination diagrams (e.g., La/Th-Hf, La-Th-Sc, and Th-Hf-Co), the studied samples were plotted in the area of felsic rocks rather than mafic rocks, which indicated that the source rocks are mainly composed of post-Archean felsic igneous rocks and recycled sedimentary rocks. This is also supported by interelement ratios such as La/Co, La/Th, Th/Co, and Th/Cr. The Sr-Nd isotopic compositions vary from the Paleogene to Neogene sedimentary rocks further suggesting a change in provenance, during which contemporaneous volcanic lava supplied some clasts with higher 143Nd/144Nd and lower 87Sr/86Sr ratios for deposition of Paleogene Es sedimentary rocks, whereas the contribution of volcanic detritus became much less during the Neogene time. The geochemistry of sedimentary rocks from the Jiyang depression possibly implies that the Paleozoic sedimentary rocks covering the old metamorphic crystalline basement rocks may not be totally denuded at the surrounding uplifts and highs during the Paleogene time. Copyright © 2011 by The Geochemical Society of Japan. +. Source

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