Method for determining original saturations in a produced field
US4751646A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1986 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | May 15, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
For a formation zone of a well, a method for determining the relationship between bulk volume of oil .phi..sub.o as a function of total effective formation porosity .phi..sub.E and height h above the oil water contact from capillary pressure data of a core taken from the formation of the well is disclosed. The disclosed relationship of the form, EQU .phi..sub.o =C.phi..sub.E -K+g log h where C, K and g are constants derived from the capillary pressure data of the core and the relationship between h and the capillary pressure is affected by the relative densities of the connate water of the zone and the oil in the zone. In a well which has been produced and no .phi..sub.E log exists, the original bulk volume of .phi..sub.o is determined from the R.sub.t log in cooperation with the core data relationship between .phi..sub.o, .phi..sub.E and h through the relationship, ##EQU1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.