| 摘要 |
FIELD: oil industry, particularly to detect pyrobitumen deposition in bottomhole formation area. ^ SUBSTANCE: method involves choosing wells on the basis of quantitative pyrobitumen precipitation projection in bottomhole formation area. Solubilization parameters under reservoir conditions and saturation pressure are defined as oil solubilization parameter. Quantitative pyrobitumen precipitation projection is carried out on the basis of retrospective behavior analysis of real oil rate dependence of well productive life by comparing above dependence with similar dependence of calculated oil rate if pyrobitumen precipitation took place. The calculated oil rate is determined from bottomhole formation area volume change, which in turn is determined from quantity of precipitated pyrobitumen calculated as: qpbt=Xh.Go.rhoh.[(deltares-deltasat)/deltasat-7.55].0.1, where qpbt is pyrobitumen quantity, kg/day; Xh is pyrobitumen concentration in surface oil samples, mass %; Go is oil rate in initial time period, m3/day; rhoh is oil density in ground environment, kg/m3; deltares is solubilization parameter in ground environment; deltasat is solubilization parameter under saturation pressure; 0.1 is coefficient. ^ EFFECT: increased efficiency. ^ 1 ex, 3 tbl, 2 dwg |
