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This mud type can be used as a completion and workover fluid, a spotting fluid to relieve a stuck pipe and as packer or casing fluid. They are very good for "Gumbo" shales. The mud weight can be controlled from 7–22 lbs/gal. It is sensitive to temperature but does not dehydrate as in the case of
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water based mud as mentioned before. It has no limit on the drilled solids concentration. The water phase should be maintained above a pH of 7. Stability of the emulsion depends on the
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Contamination samples of cuttings, cores, sidewall cores for geochemical analysis of TOC and masks the real determination of API gravity due to this contamination.
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Inability to analyze oil shows in cuttings, because the oil-based mud has fluorescence confusing with the original oil formation.
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Emulsifiers are important to oil-based mud due to the likelihood of contamination. The water phase of oil-based mud can be
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Poor stability of the emulsion results in the two layers separating into two distinct layers. The advantages are:
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Disposal of cuttings in an appropriate place to isolate possible environmental contamination.
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troublesome shales that would otherwise swell and disperse in water based mud e.g.
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Oil-based muds are expensive, but are worth the cost when drilling through:
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The disadvantages of using oil-based mud, especially in wildcat wells are:
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Contaminate areas of freshwater aquifers causing environmental damage.
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Photorealistic quality images of oil-based mud wellbores
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Standard
Handbook of Petroleum and Natural Gas Engineers
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Standard handbook of
Petroleum and Natural Gas Engineers
90:. Unsourced material may be challenged and removed.
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415:", Houston Texas, Gulf Publishing Company, 1996.
296:The requirements are a gravity of 36–37 API, a
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366:to drill deep, high-temperature holes that
53:Learn how and when to remove these messages
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431:. Houston Texas: Gulf Publishing Company.
230:Learn how and when to remove this message
212:Learn how and when to remove this message
150:Learn how and when to remove this message
175:This article includes a list of general
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465:This engineering-related article is a
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304:of 200 °F (93 °C) and an
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400:alkaline
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