Dallas,
Texas
75206
---SUBJECT
TO CORRECTION
THIS IS
A PREPRINT
TECHNI QUES
A STATI STI CACLOMPARI SONOF CEMENTI NG
BY USE OF CEMENT BOND 10GS
By
Lloyd Fens’
Pan Geo Atlas Corporation
Houston, Texas
Publication
Rights Reserved
This paper is to be presented ot the Four Corners Regionol
Meeting in Farmington,
New Mexico, September 9.10,
Meeting in Sarrta
1966, Amarillo
Barbara, California,
Novemb
Regional Meeting in Amarillo,
16-19, 1966., and is considered
Texas,
the propert) of the Society of Petroleum
unless the paper is specifically
secretary. Such abstract shauld Cantaincanspicuous acknowledgment
elsewhere after publication Jaurnal of Petraleum Technalagy ar Satiety
October 27=28, 1966 and at the California
Regional
Permission
released
Engineers.
to publish is hereby restricted
to an
abstract of nat more than 300 words, with no illustrations,
Jaurnal of Petroleum Technol Ogy Orfhe Executive
is oresented. Publication
to the press by the Editar of the
of where and
of Petroleum
h
whom the D09er
%
Discussion
af this paper is invited.
may be presented
Three capies of any discussion
should be sent ta the Society of Petroleum
far publication
Engineers
office. Such discussion
two SPE magazines.
at the above meeting and, with the paper, may be considered
in one of the
Only primary, single stage, cement iobs ore
ABSTRACT
studied so as to avoid using dota influenced
by squeeze
cementing and fil l-up problems. Al I lags studied em-
The determination
of optimum cementing technique
use for Cement Bond Lagging.
ploy the same type of equipment and calibration
niques.
tech-
is possibly the most valuable
This can be accampl ished through the use of
a large num-
ber of bond lags made on wells where various cementing
procedures were employed.
PA
and “cemented
Each log studied is assigned
i nterva [” are~
a numerical
“Goad bond ing”
defined.
value of percentage of good bonding within the cement-
ed interval.
Cement Bond Logs representing
million feet of cemented casing are herein used to compore
the efficiencies of variaus cementing techniques. The
almost one-half
CBL (Cement Bond Logging) calibration
study includes 352 bond logs fram seven states. Results
show that, in the average well, 71 percent of the ce-
methods and teal response are discussed
to show that
the quality of cement bonding in ane wel I may be log-
ically compared to that of other wells.
mented interval shaws good bonding. Little variation
found to occur between average percentage of bonding
and geographic area, setting time, well temperature
below 300” and depth. Rather wide variations are
shown between percentage of bonding and the various
oil companies, cement types, cement additives, mud
types and casing size.
is
An average percentage af bonding from all
wells studied is calculated
far each of the following
Geographic
and tobulatians
variables:
Location
are made
F
Cement Type
Cement Volume
Cement Additives
Depth Range
Slurry Weight
Setting Time
Casing Size
The data presented appear to i ustify increased
use of bond logs far selection of optimum cement type,
cement additives, casing size, slurry weight and in
of other cementing variables.
consideration
Oi I Company
References
and II lustrations
at end of paper.