Improved Wireline Cementer Developed to Cope With Water Shut-Off and Channeling Problems

A new wireline cementing tool is described, giving results of surface, subsurface and field tests. New applications and field performance results are presented. A completely new tool has been developed after extensive testing of the existing tool pointed out certain inadequacies. In order to widen its applications and obtain more predictable results, efforts were directed toward:increasing displacement,eliminating tool movement,obtaining a more satisfactory packer seal,minimizing cement contamination,retaining pressure for a prolonged period of time, andequalizing pressures following the squeeze. Surface, subsurface and field testing led to still other modifications in the equipment. In field work to date, the tool has been used almost exclusively in water shut-off problems. The major portion of field work has been in squeeze cementing perforations and a portion thereof. Field testing in various areas under various well conditions has indicated that predictable results in water shutoff problems can be effected economically with small quantities of cement. Introduction Following introduction of the first model of the wireline cementer into the Mid-Continent area in Jan., 1952, field results were closely followed and scrutinized. These results indicated that bottom-hole plug-backs apparently offered no problem. However, in squeezing perforations, the squeeze frequently failed if the cement plug was to be drilled or if the wells contained mud. These results suggested inadequate displacement of cement into the perforations and contamination of the slurry.