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Investigation on Interference Test for Wells Connected by a Large Fracture
Han GF(韩国锋); Liu YW(刘曰武); Liu WC(刘文超); Gao DP(高大鹏)
AbstractPressure communication between adjacent wells is frequently encountered in multi-stage hydraulic fractured shale gas reservoirs. An interference test is one of the most popular methods for testing the connectivity of a reservoir. Currently, there is no practical analysis model of an interference test for wells connected by large fractures. A one-dimensional equation of flow in porous media is established, and an analytical solution under the constant production rate is obtained using a similarity transformation. Based on this solution, the extremum equation of the interference test for wells connected by a large fracture is derived. The type-curve of pressure and the pressure derivative of an interference test of wells connected by a large fracture are plotted, and verified against interference test data. The extremum equation of wells connected by a large fracture differs from that for homogeneous reservoirs by a factor 2. Considering the difference of the flowing distance, it can be concluded that the pressure conductivity coefficient computed by the extremum equation of homogeneous reservoirs is accurate in the order of magnitude. On the double logarithmic type-curve, as time increases, the curves of pressure and the pressure derivative tend to be parallel straight lines with a slope of 0.5. When the crossflow of the reservoir matrix to the large fracture cannot be ignored, the slope of the parallel straight lines is 0.25. They are different from the type-curves of homogeneous and double porosity reservoirs. Therefore, the pressure derivative curve is proposed to diagnose the connection form of wells.
Keywordinterference test well connectivity hydraulic fracturing pressure conductivity coefficient
Indexed BySCI
WOS IDWOS:000456579300206
WOS Research AreaChemistry, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS SubjectChemistry ; Materials Science ; Physics
Funding OrganizationNational Natural Science Foundation of China [11602276]
ContributorHan, GF ; Liu, YW
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Document Type期刊论文
Affiliation1.{Han, Guofeng、Liu, Yuewu、Gao, Dapeng} Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
2.{Liu, Yuewu} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
3.{Liu, Wenchao} Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Han GF,Liu YW,Liu WC,et al. Investigation on Interference Test for Wells Connected by a Large Fracture[J]. APPLIED SCIENCES-BASEL,2019,9(1):AR206.
APA 韩国锋,刘曰武,刘文超,&高大鹏.(2019).Investigation on Interference Test for Wells Connected by a Large Fracture.APPLIED SCIENCES-BASEL,9(1),AR206.
MLA 韩国锋,et al."Investigation on Interference Test for Wells Connected by a Large Fracture".APPLIED SCIENCES-BASEL 9.1(2019):AR206.
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