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Tanghai, China

Guo X.,Dagang Oilfield Company | Qiang H.,Dagang Oilfield Company | Weng B.,Dagang Oilfield Company | Qin X.,4th Oil Recovery Plant in Dagang Oilfield | Wang G.,Jidong Oilfield Company
Well Testing

With the development of gas reservoir in dagang oilfield, water content gradually increased, and big water rate is much prone to bottom water. In order to improve the effect of gas drainage gas recovery, maximize gas recovery factor, vortex drainage gas recovery technology is developed. It uses the wire to lower down one or more downhole vortex tools without moving parts, changing fluid flow movement way by downhole hydrocyclone tool, increasing the gas with water. The technology has features of low cost for once time of investment, no need for daily management and later into, good abrasion resistance, long used cycle, effective extension of the gas extraction cycles and simple operation. ©, 2015, Well Testing. All right reserved. Source

Ren S.-S.,China University of Petroleum - Beijing | Yang S.-L.,China University of Petroleum - Beijing | Hang D.-Z.,Jidong Oilfield Company
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology

Based on the well-produced gas, a mixture gas dominated by carbon dioxide, a slim-tube experiment was employed to obtain the minimum miscibility pressure(MMP) and displacement efficiency. The effects of gas component on the MMP and displacement efficiency were studied under larger component changes. Through a great quantity of experimental observations and analysis, the process of displacement was divided into three phases. The oil displacement mechanism and the effects of composition on recovery were also analyzed. The relationship quantitatively and change tendency of displacement efficiency with the mole fraction of carbon dioxide and pressure were determined. The result shows that the MMP increased with the decreasing of mole fraction of carbon dioxide. In the processes of immiscible state, the displacement efficiency was increased by 3.0%-5.4% with an average value of 4.4% while mole fraction of carbon dioxide was increased by 10%. Injection pressure has distinct influence on displacement efficiency. The displacement efficiency was improved by 1.2%-3.0% while the injection pressure was increased by 1 MPa with an average value of 1.8%. Source

Li L.C.,China University of Petroleum - Beijing | Li L.C.,Jidong Oilfield Company | Yang S.L.,China University of Petroleum - Beijing | Chen H.,China University of Petroleum - Beijing
Energy Sources, Part A: Recovery, Utilization and Environmental Effects

In order to solve the growing water production problem of screen pipe completed horizontal wells in unconsolidated sandstone reservoirs, water and sand control screen pipe was developed. By combining swellable packers, installing different sized nozzles, and assorting corollary tools, a water and sand control completion string was formed and then field tests were carried out. The field application shows that water cut of water and sand control screen pipe completed horizontal wells raises much slower compared to conventional screen pipe completed horizontal wells. Copyright © Taylor & Francis Group, LLC. Source

Wu Y.,CAS Institute of Electronics | Wu Y.,University of Chinese Academy of Sciences | Song H.-J.,CAS Institute of Electronics | Huang X.-N.,Jidong Oilfield Company
Xitong Fangzhen Xuebao / Journal of System Simulation

To eliminate the serious coupling between azimuth and range for SAR in large squint mode, an improved RD imaging algorithm based on nonlinear chirp scaling was proposed, which made full use of the characteristic of SAR echo signal in large squint mode, which featured large range walk and small range curvature. First, range walk was corrected. Second, nonlinear chirp scaling operation was adopted to compensate the azimuth-dependent chirp rate. Finally, geometry correction was used to correct geometric distortion. Meanwhile the raw echo signal of the scene and the improved algorithm was simulated. Simulation results illustrate that it efficiently compensates the azimuth-dependent chirp rate, possesses high precision and satisfies the imaging quality of SAR in large squint mode. Source

Chen P.,Yangtze University | Wang X.,China University of Petroleum - Beijing | Liu H.,Jidong Oilfield Company | Huang Y.,Sinopec | And 2 more authors.
Geosystem Engineering

In the development process of fractured-vuggy carbonate reservoir with large-scale caves, the location and size of cave affect the development program. This paper takes the large-scale cave as equipotential body, treats matrix and fracture as double porous media, and establishes the flow model. Laplace transform is used to simplify the model, and then the model is solved using boundary element method. Considering the wellbore storage effect and skin effect, the bottomhole pressure-transient curve is obtained using Stefest numerical inversion method. Comparing the results of analytical solution and boundary element method in the dual porosity medium illustrate the accuracy of this model. The sensitivity of cave parameters is analyzed. It shows that the larger the cave radius is, the stronger the convex and concave of curve is. The convex is earlier and concave is sooner when cave is closer to the well. The segment of convex keeps longer and the concave margin is greater with the larger compressibility ratio. Finally, as an application example, actual test data from a large-scale cave reservoir is analyzed using this model, and the location and size of cave are obtained. It has a certain significance for the reserve evaluation and well test in this reservoir. © 2015 The Korean Society of Mineral and Energy Resources Engineers (KSMER). Source

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