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Search Results: 1 - 10 of 25734 matches for " DongDong Dong "
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Adjustment of Liquid Production in Reservoir with Handling Capacity Constraints  [PDF]
Jie Tan, Dong Zhang, Dongdong Yang, Songru Mou, Qin Peng
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.74002
Abstract: A oilfield was an oil reservoir with strong bottom water in offshore, the water cut was as high as 96%. In the high water cut stage, the most effective way of increasing oil production was to extract liquid and increase oil. The processing capacity of oilfield fluid was limited by the conditions. By using Petrel-RE-2017 software, combining reservoir engineering and percolation mechanics methods, this paper analyzes the effect of large-scale liquid pumping, expand coverage and shut-in coning in oil reservoirs with bottom water, and formulates the adjustment strategy of single well production structure of the whole oilfield. It was confirmed that large-scale liquid production can expand coverage and shutting down well can reduce water cut. It can provide reference and guidance for oil field with strong bottom water when it encounters bottleneck of liquid treatment capacity.
The Residual Potential of Bottom Water Reservoir Based upon Genetic Algorithm for the Relative Permeability Inversion  [PDF]
Dong Zhang, Jie Tan, Dongdong Yang, Songru Mu, Qin Peng
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.74012
Abstract: X oilfield has successfully adopted horizontal wells to develop strong bottom water reservoirs, as a typical representative of development styles in the Bohai offshore oilfield. At present, many contributions to methods of inverting relative permeability curve and forecasting residual recoverable reserves had been made by investigators, but rarely involved in horizontal wells’ in bottom water reservoir. As the pore volume injected was less (usually under 30 PV), the relative permeability curve endpoint had become a serious distortion. That caused a certain deviation in forecasting residual recoverable reserves in the practical value of field directly. For the performance of water cresting, the common method existed some problems, such as no pertinence, ineffectiveness and less affecting factors considered. This paper adopts the streamlines theory with two phases flowing to solve that. Meanwhile, based on the research coupling genetic algorithm, optimized relative permeability curve was calculated by bottom-water drive model. The residual oil saturation calculated was lower than the initial’s, and the hydrophilic property was more reinforced, due to improving the pore volume injected vastly. Also, the study finally helped us enhance residual recoverable reserves degree at high water cut stage, more than 20%, taking Guantao sandstone as an example. As oil field being gradually entering high water cut stage, this method had a great significance to evaluate the development effect and guide the potential of the reservoir.
Interlayer Prediction Method for Braid River Reservoirs in Offshore Oil Field  [PDF]
Wei Wang, Peng Meng, Jie Tan, Dongdong Yang, Dong Zhang
Open Journal of Geology (OJG) , 2019, DOI: 10.4236/ojg.2019.95017
Abstract: The interlayer structure of braid river reservoirs is complex and the interwell prediction is difficult in offshore oil field. Taking CFD11-1 oilfield of NgⅢ sand as an example, based on layer contrasting, the interlayer is divided into muddy interlayer, clay boulder interlayer, and physical interlayer according to lithology. Under the guidance of sedimentary model, we use the geology statistical inversion method to predict the clay boulder interlayer, consistent with the dynamic characteristics of oil production which is used for the prior quality control. The results of this study can objectively reveal the characteristics of interlayer space distribution. Compared with the traditional multi-well comparison and stochastic simulation model, this method is applied to the offshore oil field which is character with wide well space, sparse well network, which has very high application value in predicting the interlayer and deploying of inter-well encryption in the similar oilfield.
Aqua(picolinato N-oxide-κ2O1,O2)(pyridine-2,6-dicarboxylato-κ3O,N,O′)iron(III) monohydrate
Dongdong Han,Dong'e Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808030663
Abstract: In the title compound, [Fe(C6H4NO3)(C7H3NO4)(H2O)]·H2O, the FeIII ion is coordinated by two O and one N atoms from a pyridine-2,6-dicarboxylate ligand, by two O atoms from a picolinate N-oxide ligand and by one water O atom in a distorted octahedral geometry [Fe—O = 1.940 (3)–2.033 (3) and Fe—N = 2.057 (4) ]. In the crystal structure, the coordinated and solvent water molecules contribute to the formation of O—H...O hydrogen bonds, which link the molecules into layers parallel to the ab plane.
The Evolutionary Road: The Common Goal of Human as a Species  [PDF]
Dongdong Du
Open Journal of Philosophy (OJPP) , 2018, DOI: 10.4236/ojpp.2018.85033
Abstract: This paper puts forward the idea of the right, evolution road of all mankind, and emphasizes that it should be regarded as the common purpose of human beings from the view of human evolution. Also from the point of philosophical, it is clarifying the concept of human path, emphasizing the individual and its existence, openness and humanity based on human nature (human emotion, love, care); the rational (thinking, reason) based on reason, experience, learning and research; and two goals: utilitarian and efficiency, the evolutionary of human beings. In the end, from the view of the question they focused on, attribution, solution and attitude towards human nature, it distinguishes the concept between “the evolutionary road of human beings” and “Noble Eightfold Path” to alert people that development, progress, evolutionary path of human is unparalleled and it is the right way for mankind. Purpose: The combination of reason and human nature, so as to enhancing human efficiency, meeting human needs, and ultimately promoting people into the correct, evolutionary path. Method: Descriptive thinking can be used.
Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea
DongDong Dong,ShiGuo Wu,GongCheng Zhang,ShengQiang Yuan
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0326-1
Abstract: Based on the latest seismic and geological data, tectonic subsidence of three seismic lines in the deepwater area of Pearl River Mouth Basin (PRMB), the northern South China Sea (SCS), is calculated. The result shows that the rifting process of study area is different from the typical passive continental margin basin. Although the seafloor spreading of SCS initiated at 32 Ma, the tectonic subsidence rate does not decrease but increases instead, and then decreases at about 23 Ma, which indicates that the rifting continued after the onset of seafloor spreading until about 23 Ma. The formation thickness exhibits the same phenomenon, that is the syn-rift stage prolonged and the post-rift thermal subsidence delayed. The formation mechanisms are supposed to be three: (1) the lithospheric rigidity of the northern SCS is weak and its ductility is relatively strong, which delayed the strain relaxation resulting from the seafloor spreading; (2) the differential layered independent extension of the lithosphere may be one reason for the delay of post-rift stage; and (3) the southward transition of SCS spreading ridge during 24 to 21 Ma and the corresponding acceleration of seafloor spreading rate then triggered the initiation of large-scale thermal subsidence in the study area at about 23 Ma.
Geophysical Signature of the Shallow Water Flow in the Deepwater Basin of the Northern South China Sea Geophysical Signature of the Shallow Water Flow in the Deepwater Basin of the Northern South China Sea
ZHANG Xiaohua,SUN Yunbao,WU Shiguo,DONG Dongdong
- , 2018,
Abstract: Shallow water flow(SWF), a disastrous geohazard in the continental margin, has threatened deepwater drilling operations. Under overpressure conditions, continual flow delivering unconsolidated sands upward in the shallow layer below the seafloor may cause large and long-lasting uncontrolled flows; these flows may lead to control problems and cause well damage and foundation failure. Eruptions from over-pressured sands may result in seafloor craters, mounds, and cracks. Detailed studies of 2D/3D seismic data from a slope basin of the South China Sea(SCS) indicated the potential presence of SWF. It is commonly characterized by lower elastic impedance, a higher Vp/Vs ratio, and a higher Poisson's ratio than that for the surrounding sediments. Analysis of geological data indicated the SWF zone originated from a deepwater channel system with gas bearing over-pressured fluid flow and a high sedimentation rate. We proposed a fluid flow model for SWF that clearly identifies its stress and pressure changes. The rupture of previous SWF zones caused the fluid flow that occurred in the Baiyun Sag of the northern SCS
A novel mutation in NF1 gene in a Chinese patient with Legius syndrome like café au lait spots  [PDF]
Dongdong Zheng, Xiaohong Duan
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.22038

Neurofibromatosis type I (NF1) (OMIM, 162200) and Legius syndrome (OMIM, 611431) both have multiple café au lait spots. It is a challenge to differentiate the two diseases. Here we report a Legius syndrome-like patient who finally was identified as NF1 with a novel mutation in NF1 exon1 (c.55G > T). The mutation caused a substitution of a glutamic acid (GAG) with a terminator codon (TAG). For those patients with only multiple café au lait macules, axillary and inguinal freckling, but without any other clinical signs in NF1 and Legius syndrome, a gene testing is necessary to give a final diagnose. We suggested to use “Neurofibromatosis type 1like syndrome” to describe those patients just like our patient reported here.

3D Braided Material Based on Space Group R3 Symmetry  [PDF]
Wensuo Ma, Dongdong Yin
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.412098

A unit cell geometrical structure was found with the use of symmetry operations corresponding to the point group C3. Based on the symmetry of space group R3, a 3D braided geometrical structure was obtained by transforming the unit-cell. The features corresponding to this braided structure were studied. The fiber volume percentage and variational tendencies of the material were predicted by establishing a geometric model.

ftsZ gene and plastid division
Dongdong Kong,Dong Wang,Yong Hu,Chuanli Ju,Yingdian Wang,Yikun He,Jingsan Sun
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03183933
Abstract: Plastid is one of the most important cellular organelles, the normal division process of plastid is essential for the differentiation and development of plant cells. For a long time, morphological observations and genetic analyses to special mutants are the major research fields of plastid division, but the molecular mechanisms underlying plastid division are largely unknown. Because of the endosymbiotic origin, plastid division might have mechanisms in common with those involved in bacterial cell division. It has been proved that several prokaryotic cell division genes also participate in the plastid division. Recently, the mechanisms of prokaryotic cell division have been well documented, which provides a valuable paradigm for understanding the plastid division mechanisms. In plants, the functional analyses offtsZ, a key gene involved both in bacteria and plastid division, have established the solid foundation for people to understand the plastid division in molecular level. In this paper we will make a review for the research history and progress of plastid division.
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