Waterflooding in North Government Wells Field, Duval County, Texas
- D.M. Collingwood (Sun Oil Co.) | R.J. Bethancourt (Sun Oil Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- June 1953
- Document Type
- Journal Paper
- 157 - 164
- 1953. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.3.4 Scale, 1.6.11 Plugging and Abandonment, 5.6.4 Drillstem/Well Testing, 4.2.3 Materials and Corrosion, 4.1.5 Processing Equipment, 5.4.2 Gas Injection Methods, 4.1.2 Separation and Treating, 4.2 Pipelines, Flowlines and Risers, 2.4.3 Sand/Solids Control, 5.4.1 Waterflooding, 1.6.9 Coring, Fishing, 1.14 Casing and Cementing, 3 Production and Well Operations, 2.4.5 Gravel pack design & evaluation, 6.5.2 Water use, produced water discharge and disposal, 1.6 Drilling Operations, 2.2.2 Perforating
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The use of a pilot waterflood is very desirable where all of the pertinent data necessary to initiate a full scale waterflood are not available. This paper attempts to take a specific case and show the step by step process of starting with a pilot water flood and progressing to a full scale flood as results are obtained.
Many of the older fields of Southwest Texas are approaching depletion by primary production methods. As primary producing operations on individual properties approach theireconomic limit, conflicting considerations face management: on the one hand, plugging and abandonment of wells for equipment salvage; on the other hand, further investment in secondary recovery installations, equipment, and well workovers in the interests of conservation and additional oil reserves.
In many instances, where primary production by pressure depletion and gas solution drive has been comparatively good, there still exists the possibility of an economic secondary recovery by waterflood. This is not necessarily true to the same degree of all such fields, nor all portions of large fields.
To properly evaluate the economics of a prospective waterflood requires a considerable amount of precise geological, statistical, and physical data. Such information on the older fields is often very limited, and in the case of the property discussed in this paper was considered inadequate to justify investment in an overall waterflood. Primary production was estimated at 39 per cent of the original oil in place, yet sand conditions of permeability and homogeneity, and position in the field appeared to be favorable for a limited margin of profit from a carefully controlled waterflood.
Thus a pilot waterflood, with its minimum initial financial risk, followed by extension as favorable results were obtained, seemed to be the answer for the Sun Oil Co.'s L. Wiederkehr lease in the North Government Wells Field, Duval County, Texas.
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