Laserfiche WebLink
75 sacks of cement. After this job was completed, the well was reentered <br />and it was determined (by the absence of cement in the casing) that the <br />cement had not set up because the sodium silicate was being washed away <br />before it could mix with the cement. Following the January attempt to <br />cement 3M-TDR, the water balance has not significantly improved. <br />As a result of the failure of the first cementing alternative, NSI would like to <br />try a second cement job with 30 barrels of food grade oil mixed with <br />bentonite (11 pounds per gallon). The mixture would be pumped down the <br />4'/2 inch casing, through the perforations. When the mixture encounters <br />water it will "clabber" and move down hole to the washout zone, plugging <br />the Loss zone, The oiUbentonite mixture will be followed by an enriched <br />cement mixture that is ~ 15 pounds per gallon. Based on NSI discussions <br />with cement engineers this option has the highest probability of success. If <br />this attempt is not successful a three stage (sodium silicate/cement) option <br />would be utilized. As a last resort, a "hot" mix of cement plus an accelerate <br />will be used to plug this well. The use of the accelerate will probably cause <br />enough heat to damage the remaining cables (2) and future subsidence <br />monitoring would be by use of logging tools down the inch 4'/2 casing. <br />Please review the proposed cementing options and provide approval as soon <br />as possible. If there aze any questions please contact Rod Storey or me. <br />Sincerely, <br />Ed Baker, REM <br />EHS Manager <br />