Estimates of Primary Recovery from Some Typical Glenrose Fields in Northeast Texas, by G.J. Loetterle, Pages 19 - 25
from:
East Texas Geological Society Symposium: Estimates of Primary Recovery from Some Typical Glenrose Fields in Northeast Texas
Copyright 1954 by The East Texas Geologic Society. All rights reserved.

Estimates of Primary Recovery from Some Typical Glenrose Fields in Northeast Texas

G.J. Loetterle
Consulting Geologist, Hudnall, Pirtle and Loetterle
Tyler, Texas

ABSTRACT

The Glenrose reservoirs of the East Texas district are chiefly the Rodessa and Pettet limestone formations, The James limestone, which occurs stratigraphically between the Rodessa and Pettet, is developed in porous form in only a few local areas of quite limited extent. The Rodessa formation has been subdivided into the Hill, Gloyd, Dees, and Young zones in descending order. There is commonly no effective water drive in any of the Glenrose reservoirs, and the oil recovery mechanism is either solution gas or gas cap drive. The dissolved gas - oil ratios are usually on the high side, varying typically from about 400 to 1,500 cubic feet per barrel and gradually increasing as the wells are produced. The shrinkage from reservoir to stock tank is correspondingly high. Porosity and permeability are of a low order as compared to those found in most sand reservoirs.