Open AccessDynamic Stress Field Evolution of the Shale Oil Reservoirs: Development and Optimization of Well Patterns
Author(s) -
Shiguo Wang,
Yan Jin,
Shiming Wei,
Yang Xia
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/570/2/022058
Subject(s) - oil shale , geology , petroleum engineering , oil field , stress field , poromechanics , stress (linguistics) , coupling (piping) , interference (communication) , oil production , geotechnical engineering , engineering , structural engineering , paleontology , mechanical engineering , linguistics , philosophy , channel (broadcasting) , electrical engineering , porous medium , finite element method , porosity
Research on shale oil has gained considerable attention with regard to global unconventional oil exploration, which is of the strategic significance in the field of energy. Considering the characteristics of continental shale reservoirs, a three-dimensional fluid–solid coupling model of a multistage fracturing horizontal well was established based on the poroelasticity theory. The difference in stress sensitivity among different layers was also considered in this model. The evolution of pore pressure and stress field during the production process was analyzed through numerical simulation. A comparison of the planar well pattern and stereo well pattern revealed that the latter has less interwell-flow interference and smaller alteration angle of the minimum principal stress; thus, in the latter pattern, intersection with existing hydrofractures during refracturing can be avoided. It is more advantageous to refracturing in the middle of the outside horizontal section, but with increase in production time, the optimal fracturing section shrinks. Considering the maximum recovery factor and interwell interference, well-spacing optimization is recommended from 200 m to 300 m.