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Use of Inverted-Emulsion Mud Proves Successful in Zones Susceptible to Water Damage

Authors
Glenn A. Trimble (Mobil Oil Co.) | M.D. Nelson Jr. (Socony Mobil Oil Co.)
DOI
https://doi.org/10.2118/1296-G
Document ID
SPE-1296-G
Publisher
Society of Petroleum Engineers
Source
Journal of Petroleum Technology
Volume
12
Issue
02
Publication Date
February 1960
Document Type
Journal Paper
Pages
23 - 30
Language
English
ISSN
0149-2136
Copyright
1960. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
Disciplines
1.6.10 Running and Setting Casing, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 5.6.1 Open hole/cased hole log analysis, 1.14 Casing and Cementing, 1.10 Drilling Equipment, 2 Well Completion, 2.4.3 Sand/Solids Control, 2.7.1 Completion Fluids, 1.6 Drilling Operations, 2.2.2 Perforating, 3.2.4 Acidising, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 3.1.6 Gas Lift, 3 Production and Well Operations, 1.11 Drilling Fluids and Materials, 5.2 Reservoir Fluid Dynamics, 4.1.2 Separation and Treating, 4.1.5 Processing Equipment
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Abstract

Extreme difficulties in well completions in Pennsylvanian age sands in Central Oklahoma led to the use of an inverted-emulsion mud for drilling-in, completion and workover operations in this area. This mud, containing about equal volumes of oil and water or water-base mud and emulsified by a modified wood product, has been employed successfully in over 150 operations over a six-year period. In zones that are susceptible to water damage, improved formation evaluation, better well completions and effective recompletion of damaged wells have been achieved. Mud is stored and re-used extensively. Testing and maintenance are relatively simple and inexpensive. The geological interpretation of formations has been adequate where the hole has been drilled with this mud. The mud offers no advantage in limestone or dolomite completion, and it may slow drilling rates in shale.

Early Well Completion Experience

In Central Oklahoma the majority of wells are in and the greater part of oil production is from sands of Pennsylvanian age. A number of formations are represented, of which the Springer and Hart sands are two of the better known.

Prior to 1953, the Mobil Oil Co. (then Magnolia Petroleum Co.) experienced severe difficulties in many well completions in various of these sands. Other operators in this area were having similar difficulties.

A characteristic experience follows. Drilling with a water-base mud (as was customary in this area), a well penetrated one or more Pennsylvanian age sands. At the time of penetration, drill-stem tests indicated fair producing rates. When completion of the well was attempted after further exposure of the sand to drilling mud or water, production was often much lower than indicated by the drill-stem test. In some extreme cases, no production could be obtained. In an outstanding example, oil flowed at 30 bbl per hour on drill-stem test, but could not be made to produce afterwards.

Well stimulation techniques, including acidizing and fracturing, were not effective in obtaining satisfactory completions. In some cases, attempted stimulation procedures, as employed, caused further decreases in production of oil.

File Size  708 KBNumber of Pages   8
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