Producing reserve estimation and design optimization of rhomboid well pattern in anisotropic reservoirs of low permeability

被引：0
作者：
Chen M. [1 ,2 ]
Yang Z. [3 ]
Qin L. [2 ]
Fu S. [2 ]
Rong J. [2 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing
[2] School of Petroleum Engineering, China University of Petroleum(Beijing), Beijing
[3] Bohai Oilfield Research Institute of Tianjin Branch, CNOOC, Tianjin
来源：
| 1600年 / Editorial Department of Oil and Gas Geology卷 / 42期
关键词：
Anisotropy; Effective reserve producing; Equilibrium displacement; Low permeability reservoir; Optimization design; Reservoir development; Rhomboid injection-production well pattern;
D O I：
10.11743/ogg20210519
中图分类号：
学科分类号：
摘要：
Determining a well array with reasonable spacing for flooding in rhomboid well pattern, is the key to achieving effective development of reserves and well emplacement for equilibrium displacement development in regular low-permeability anisotropic reservoirs.Based on the characteristics of low-permeability reservoirs, we establish a seepage equation considering the influence of threshold pressure gradient and permeability anisotropy.Classical seepage mechanics is applied to obtain an analytical solution for the seepage field distribution in flooding unit of the rhomboid inverted nine-point well pattern.In turn, a method for evaluating the producing reserve is proposed in line with the analysis of the lateral seepage velocity variation in the flooding unit, and the main factors influencing and rules of producing reserve variation in low-permeability anisotropic reservoirs at different conditions are obtained.At last, a calculation model for optimizing the rhomboid inverted nine-point well pattern is built with the ultimate optimization purpose of meeting "requirement on effective producing reserve range and maximum equilibrium displacement coefficient", and a simultaneous optimization for the best well array with reasonable spacing in this pattern is achieved.Case analysis shows that the rhomboid well pattern optimization design method for low-permeability anisotropic reservoirs can be applied to obtain the best well array with reasonable spacing in line with the actual conditions of the reservoir and the development requirements.The design in all, is of scientific basis to the effective development of reservoirs and optimal emplacement of well patterns. © 2021, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：1223 / 1233
页数：10
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