Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Well Testing》 2018-02
Add to Favorite Get Latest Update

Well testing curves of fractured horizontal wells in low-permeability gas reservoirs:characteristics and influencing factors

CHANG Baohua;QIANG Xiaolong;YANG Yatao;CAO Wen;REN Chaofeng;YUAN Chunhui;PetroChina Research Institute of Petroleum Exploration and Development;No.2 Gas Production Plant,PetroChina Changqing Oilfield Company Limited;Changbei Operation Company,PetroChina Changqing Oilfield Company Limited;  
For fractured horizontal wells in low-permeability gas reservoirs,actual curves and theoretical curves of well testing are different in flow regime and shape. Accordingly,in this paper,theoretical type curves were generated using the mathematical model to highlight the impacts of length of horizontal section,fracture half-length and number of fractures on well testing curves. Based on case studies,root causes for differences between actual curves and theoretical curves were analyzed. The study results show that flow regimes in fractured horizontal well can be classified into 5 stages: bilinear flow,radial flow,reservoir linear flow,transitional flow and system radial flow. Compared with conventional horizontal wells,fractured horizontal wells display clear features of fracture bilinear flow or linear flow before the characteristics of the first radial flow are observed. Moreover,the longer the fracture half-length is,the more apparent the differences in initial linear flow and fracture radial flow are; the longer the horizontal section is,the later the fracture radial flow occurs,while system radial flow displays uniform regime in the late stage. In conclusion,contamination of near-fracture reservoir by fracturing fluids and inter-connected fracture networks formed in near-wellbore zones are key causes for differences between actual curves and theoretical curves of well testing. The result can provide an evidence for selection of the optimal model for interpretation of well testing data in horizontal wells.
【Fund】: 国家自然科学基金“致密砂岩微纳米孔喉系统对储层含气性及气水运移的控制机理”(51704326)
【CateGory Index】: TE353
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved