Laboratory Investigations on Acid Treatment of Oil Sands
- F.B. Plummer (Member A.I.M.E.) | R.B. Newcome Jr. (University of Texas)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1936
- Document Type
- Journal Paper
- 100 - 115
- 1936. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 1.14 Casing and Cementing, 2.4.3 Sand/Solids Control, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 4.1.5 Processing Equipment, 4.1.2 Separation and Treating, 1.6.9 Coring, Fishing, 2.2.2 Perforating, 1.2.3 Rock properties, 3.2.4 Acidising, 5.8.5 Oil Sand, Oil Shale, Bitumen, 4.2.3 Materials and Corrosion
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The practice of introducing acid into oil wells to increase production ofoil and gas has been in use since 1894, when it was first used in thePennsylvania oil fields. It is only since 1928 that it has been used to anyextent in the Mid-Continent. The process has proved successful in increasingproduction, at least temporarily, in depleted oil fields where the producingformation is highly calcareous and where water drive is not too pronounced. Inthe Zwolle field in Louisiana, where the producing horizon is a chalk,increases of 100 per cent have been recorded In north-central Texas, where theoil is produced from the Marble Falls limestone, equally pronounced increaseshave resulted. The production also in some fields yielding oil from quartz sandcemented with calcite has been benefited. The evidence of actual increase intotal recovery of oil, however, has been questioned by some engineers. It hasbeen pointed out that the results of the treatment of a well in a new district,where the process has never been tried out, can never be predicted withcertainty, since other factors besides percentage of calcareous content of theoil sand playa large part in determining the success of the method.
Numerous articles have been published on acid treatment and on the effects ofacid on limestone, yet very little has been written concerning experimentalwork on the actual effect of acid on capillary pores and larger oil-coatedvoids of oil sands. This is due partly to difficulties in duplicating fieldconditions in a laboratory and partly to the fact that the process has beencarried out largely by contracting companies that have been unwilling topublish details of their results for fear of loss of business to competitors.The authors, using equipment developed to measure the radial permeability ofoil-sand cores, have developed a method of investigating the results of acidtreatment which has enabled them to test numerous cores and to study in somedetail the action of acid on the different types of rocks, particularlyfine-grained rocks.
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