Open AccessAnalysis of Diagnostic Fracture Injection Tests for Shale Gas Wells
Author(s) -
Man Chen,
Xuemei Jiang,
Jing Zhang,
Shangjun Gao,
Xingzheng Feng,
Hai Yang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/651/3/032093
Subject(s) - petroleum engineering , well test (oil and gas) , shale gas , fracture (geology) , closure (psychology) , oil shale , sichuan basin , natural gas field , geology , hydraulic fracturing , geotechnical engineering , natural gas , engineering , paleontology , geochemistry , economics , market economy , waste management
Formation pressure estimation of shale gas wells is one of the key factors affecting production prediction of gas wells, and diagnostic fracture injection test analysis is an important means to accurately obtain formation pressure parameters. In this paper, through the establishment of shale gas well diagnostic fracture injection test model, taking ChangNing shale gas field as an example, the actual test data of pre-production gas wells are fitted. Then analysis the change law of pressure transient curves and the model fitting results with conventional analysis method comparing with the results - G function diagnosis curve method to explain, optimizing fracture closure point selection mode, this paper proposes a new method to determine fracture closure point: when G derivative curve begins to deviate from the initial linear trend, correct selection of closed point, to obtain accurate formation pressure coefficient, formation pore pressure of reservoir parameters such as reservoir. At the same time, the improved method is used to evaluate the reservoir parameters of the actual gas wells in ChangNing, providing theoretical guidance for the subsequent fracturing construction and production.