Effect of Arsenates on the Viscosity of Drilling Muds
- B.C. Craft (Louisiana State University) | C.M. Moncrief (Louisiana State University)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1946
- Document Type
- Journal Paper
- 144 - 146
- 1946. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.4.10 Microbial Methods, 1.11 Drilling Fluids and Materials, 1.6 Drilling Operations, 4.1.2 Separation and Treating
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A bentonite-clay drilling mud when treated with tetrasodium pyroarsenateunderwent substantially the same reduction in viscosity and water loss as whentreated with the complex phosphates. The complex arsenate showed a slightlyhigher reversion after heating; the other arsenates showed poorviscosity-reducing properties.
During the past 10 years the chemical control of drilling mud has become ofmajor importance in affecting the successful drilling and working over ofwells. The desired properties of drilling mud have been well established, andin obtaining these characteristics there has developed a large market forviscosity-reducing chemicals.
Viscosity reduction produced by humic acid, tannic acid, sodium silicate,sodium tannate, Calgon, and the complex phosphates has been described byLoomis, Ford, and Fidiam. The effects of treatment with complex phosphates andammonium polyphosphates on the rheological properties of muds were investigatedby Fancher and the alkali vanadates have been described by Williams.
It is the purpose of this paper to point out the effects of arsenates incontrolling the viscosity and gelling characteristics of a drilling mud.Viscosities and gel strengths were measured at room temperatures with a Stormerviscosimeter calibrated in centipoises and operated at 600 r.p.m. Water losswas determined at 80?F with the Baroid low-pressure wall-building tester at apressure of 100 lb. per sq. in. for 30 min. The hydrogen-ion concentration wasmeasured with a glass electrode. The bentonite-clay suspensions were preparedin the laboratory and allowed to age several days before testing.
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