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Primary Examiner: Novosad, Stephen J.
Assistant Examiner:
Attorney: Richards, Harris & Medlock

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Title: Method of cementing wellbores using high temperature cement mud spacer

Abstract: A spacer composition for use in borehole cementing operations is disclosed which has excellent high temperature stability and compatability with cement slurries and drilling fluids. The spacer composition comprises a single phase water base system containing stabilized attapulgite clay.

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Inventors: Beirute, Robert M. (Fort Worth, TX, US)

Application Number: 907568
Filing Date: 1978-05-19
Publication_date: 1980-02-26
Assignee: The Western Company of North America (Ft. Worth, TX)
Primary Class(es): 166/291 507/269, 507/928
Other Classes:
US Patent Ref:

2044758	Jun, 1936	Cross et al.	175/65.
2206677	Jul, 1940	Shepler	166/292.
2582909	Jan, 1952	Laurence	166/291.
3046221	Jul, 1962	Dodd	252/8.
3208523	Sep, 1965	Coyle et al.	166/292.
3658701	Apr, 1972	McGlothlin et al.	252/8.
3854538	Dec, 1974	Suma, Jr. et al.	166/292.
3878895	Apr, 1975	Wieland et al.	166/291.
3884302	May, 1975	Messenger	166/291.
3887009	Jun, 1975	Miller et al.	166/292.
4141843	Feb, 1979	Watson	166/291.

Other Refs: Other References: Beirute, Robert M., "All Purpose Cement Mud Spacer", Society of Petroleum Engineers (SPE 5691), Jan. 29-30, 1976, 8 pages.