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Qi Y.-D.,CAS Institute of Porous Flow and Fluid Mechanics | Qi Y.-D.,Petrochina | Lei Q.,Petrochina | Yang Z.-M.,CAS Institute of Porous Flow and Fluid Mechanics | And 5 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

Based on the popular pattern shapes in fault block oilfields and the nonlinear characteristics of the fluids flow in extra-low permeability reservoirs, the expression of effective development coefficient was derived through the streamtube-integration method, and then the effects of pressure difference, well patterns geometry and the shapes of nonlinear flow curves on EDC were analyzed. The new theory was applied to evaluate the well patterns in Hua 17 Block in Jiangsu Oilfield, and a proposal for patterns adjustment was put forward. The results show that in homogeneous isotropic extra-low permeability fault-block reservoirs, the optimal well patterns are those in the shapes of isosceles or quasi-isosceles triangles; for a certain non-isosceles triangle pattern, there is a critical pressure difference and a critical well spacing value bringing the EDC on abrupt changes; and increasing pressure difference is an effective measure to improve the development effect for relatively higher permeability reservoirs while reducing well spacing or row spacing is effective for the relatively lower ones.


Qi Y.-D.,CAS Institute of Porous Flow and Fluid Mechanics | Lei Q.,Petrochina | Yang Z.-M.,CAS Institute of Porous Flow and Fluid Mechanics | Yu R.-Z.,CAS Institute of Porous Flow and Fluid Mechanics | And 3 more authors.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2011

Considering the geometry of well patterns and the nonlinear features of fluids flow, the calculation formula of Effective Development Coefficient (EDC for short) for triangular patterns in ultra-low permeability fault-block oilfields was deduced by applying the stream-tube integral method. The influences of pressure difference, pattern geometry and threshold pressure gradient on EDC were analyzed. The analyses indicated that for ultra-low permeability fault-block oilfields the optimal pattern shape is isosceles/pseudo isosceles triangle. Increasing pressure difference is an effective measure to improve the development effect for relatively high permeability oilfields while reducing well spacing is effective for relatively low ones. This research provides a rapid method to evaluate triangular patterns in ultra-low permeability fault-block oilfields. © 2011 IEEE.


Hou J.,China University of Petroleum - East China | Du Q.,China University of Petroleum - East China | Li Z.,Geological Science Research Institute | Pan G.,China University of Petroleum - East China | And 2 more authors.
Flow Measurement and Instrumentation | Year: 2013

Foam flooding has become one of the most effective methods to improve oil recovery in high water-cut oilfields. In order to obtain images of the texture of foam in the cores under high pressure, this paper developed an experimental real-time image acquisition device for detecting the foam's texture as the bubbles flowed in the porous media. Image processing and statistic analysis methods for describing the foam's texture were also established. Experimental results showed that the bubble distribution became homogeneous and stabilized, and the pressure difference between two ends of the core increased gradually during the process of foam flooding. In the initial stage, the bubbles presented a flake-like distribution. The liquid phase flowed continuously, as did the gas phase. As the displacement continued, the volume of a single bubble lessened, while the number of bubbles increased. When the bubbles reached a steady state, the pressure difference between the two ends of the core was stable, and the bubbles presented a uniform distribution. A larger injection rate, a higher core permeability and a larger gas-liquid ratio all can cause a larger-than-average bubble diameter, poor stability and a decreased degree of homogeneity. © 2013 Elsevier Ltd.


Li Y.,Geological Science Research Institute | Yan Y.,Geological Science Research Institute | Yu W.,Geological Science Research Institute | Wang J.,Geological Science Research Institute | And 2 more authors.
Well Testing | Year: 2015

Utilizing the streamline interference well testing interpretation method to interpret the interference well testing data in Gudong 7th district of Shengli oilfield, the interwell connectivity and the areal heterogeneity is clarified, which provides dynamic data for the following numerical reservoir simulation. Streamline well testing interpretation method can take many complex factors into consideration such as the main drive mechanism and physicochemical phenomena of the combination flooding process, reservoir heterogeneity and multiphase flow, from which the resulting interpretation is accurate and reliable. ©, 2015, Well Testing. All right reserved.

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