Non-Plugging Emulsions Useful as Completion and Well-Servicing Fluids
- G.G. Priest (Humble Oil & Refining Co.) | T.O. Allen (Humble Oil & Refining Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- March 1958
- Document Type
- Journal Paper
- 11 - 14
- 1958. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 2.4.3 Sand/Solids Control, 4.2.3 Materials and Corrosion, 1.14.3 Cement Formulation (Chemistry, Properties), 1.11 Drilling Fluids and Materials, 5.6.1 Open hole/cased hole log analysis, 2.7.1 Completion Fluids, 3.2.5 Produced Sand / Solids Management and Control, 1.14 Casing and Cementing, 2.2.2 Perforating, 2.4.5 Gravel pack design & evaluation, 3 Production and Well Operations
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The development and use of nonplugging emulsions has provided a solution to certain problems associated with completing and reworking wells which have plagued the industry for years.
In the present work emulsions free of insoluble solids have been developed for use in wells with temperatures up to 250°F and with pressures requiring densities up to 12.5 lb/gal. They possess the required properties of a satisfactory fluid for completing and reworking wells; they are non-plugging, they exhibit a low fluid loss, and they have a controllable density.
Non-plugging emulsions have been used in approximately 200 completion and well-servicing operations. They were positioned to cover the interval to be perforated or to protect existing perforations during workover operations. Comparative data from several wells show that the productivity indices of wells perforated in the emulsions were substantially higher than the productivity indices of offset wells perforated in mud or water. Fewer difficulties in servicing wells and in getting wells back on production were experienced when emulsions were used as protective fluids to prevent water or mud from contacting exposed formations. In one field, the use of emulsions as perforating fluids has reduced the incidence of expensive sand control measures.
Precautions should be taken to avoid contamination of drilling muds and cements by the emulsions. Contamination can be avoided in most operations by following careful placement procedures.
Research conducted during the past few years has demonstrated that perforations are often plugged by debris from the perforator, pulverized sand from the formation, and mud solids when drilling mud is in the casing at the time the perforations are made. This plugging of perforations causes numerous problems in the completing, producing, and repairing of wells. For example, low well productivity, sand production, premature gas or water production, and failure of squeeze-cementing jobs are but a few problems recognized as being aggravated by plugged perforations.
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