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Liaoning, China

He Z.,China University of Geosciences | Wu D.,Well Logging Company | Fan Y.,Mud Logging Company
Advanced Materials Research | Year: 2012

Many factors may affect array induction log, including skin effect. In this paper, according to relative formula deduced, a correction method of skin effect based on multi-frequency measurement signals is proposed using only the real component. This paper gives apparent conductivities that are from first order derivative correction and second order derivative correction by Chebyshev polynomial fitting method. Compared with measured data calculation, it showed that the correction results from the method above were in good agreement with the data from Express software. © (2012) Trans Tech Publications, Switzerland.

Liu Z.,Jilin University | Wang Z.,Jilin University | Liu J.,Jilin University | Feng Y.,Jilin University | Qu D.,Well Logging Company
Geophysical Prospecting for Petroleum | Year: 2015

Since the Cenozoic, because of the influence of the Tanlu Fault, six tectonic movements have occurred in the Eastern Depression of Liaohe Basin, which were accompanied by volcanic activity with different intensity; so igneous rock is widely developed. Based on six wells, the characteristics of log combination of the intermediate and basic igneous rock are analyzed, including tight basalt, stomatal basalt, basaltic volcanic clastic rock, trachyte, trachytic volcanic clastic rock and diabase. Selecting typical lithology data, the characteristics of igneous lithology logging response in this area are summarized; and a set of suitable lithology identification chart is established for the area. The crossplot of natural gamma versus deep lateral resistivity can well identify diabase, and the crossplot of neutron and density can well distinguish basalts. Using least squares support vector machine (LS-SVM), the igneous rock lithology identification model is constructed. Compared with core analysis and cutting description, the accuracy rate of the identification result reaches up to 79.5%. The combination of crossplot and LS-SVM well solves the problem of lithology identification and provides assistance for further interpretation of oil and gas reservoirs. © 2015, Science Press. All right reserved.

Zhu X.-X.,China University of Petroleum - East China | Zhang L.,Well Logging Company | Xue S.-F.,China University of Petroleum - East China | Tong X.-H.,Shandong University | Teng Y.-S.,China University of Petroleum - East China
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2014

Based on the sensitivity analysis of deformation rate effect on porosity evolution, the mechanical model for evaluating perforating damage of sandstone was developed. Combining with mechanical parameters at different time, which were obtained by dynamic response analysis of sandstone around the perforation tunnel, the distributions of radial porosity and permeability were studied. Then, the perforating damage degree was evaluated. The results were compared with experimental data, and the validity of the evaluation method was proved to be effective. The results also show that the porosity near the tunnel is even somewhat higher than undamaged average porosity because of crushing of grains or tensile fractures around the perforation wall. In addition, porosity and permeability of sandstone in crushed zone reduce significantly, which impairs the flow performance of perforating tunnel severely. Furthermore, the more distance from the entrance of the tunnel, the smaller the reducing amplitude of crushed zone thickness, porosity and permeability will be. When the shock load intensity increases or the strength of sandstone decreases, the damage degree will be severe.

Li K.,Well Logging Company | Li S.,Xihua University | Dong Y.,NO.6 Oil Production Factory
Well Testing | Year: 2013

In this work, we establish the multilayer reservoir percolation model and take the effective hole diameter and borehole storage conditions of variable flow rate into account; We obtain the expressions of dimensionless reservoir pressure and dimensionless bottom hole pressure in the Laplace space by Laplace transform, It is found that among the solutions of three outer boundary conditions what have unified structure, the result takes great convenience for programme well test analysis software and have far-reaching significance in the multilayer percolation of percolation theory.

Xue S.-F.,China University of Petroleum - East China | Pang M.-Y.,China University of Petroleum - East China | Zhu X.-X.,China University of Petroleum - East China | Zhang L.,Well Logging Company | Zhu S.-H.,Schlumberger
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

The perforation tunnel is the channel for transporting the hydrocarbon to the well bore. The shaped charge perforation operation, however, usually leads to some damage to the surrounding sandstone. Based on the perforation efficiency tests and numerical simulations, a new method is developed to quantitatively evaluate the porosity and permeability damage degree of the compacted zone. The kinematic-hardening plastic flow law is used to describe the sandstone deformation under high strain rate loading. Then dynamic responses of near-tunnel sandstone during perforation process are simulated by using the explicit dynamic analysis code LS-DYNA. Some key data, such as the sandstone matrix stress, plastic strain and volumetric strain are obtained. Subsequently, the damage degree of compacted zone is quantitatively analyzed by using these data together with the porosity and permeability evolution models. By comparing numerical results with the experimental results of core flow efficiency and CT scanning data from the interparticle pore sandstone targets in Shengli oil field; good agreements are achieved, the validaty of the proposed method is verified. It is shown that, during shaped charge perforation, there are two major damage mechanisms for the compacted zone, namely, the plastic squeezing and shear swelling. Near the tunnel's inner wall, the sandstone matrix mainly suffers dilatancy actions, which enhances the porosity; meanwhile, the original structure of pore are changed due to plastic squeezing, which brings a jam to the tunnels, resulting in a reduction in permeability. ©, 2015, Academia Sinica. All right reserved.

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