AbstractsMedical & Health Science

"A study of the literature and field operations indicates conclusively that squeeze cementing operations are performed almost exclusively as corrective measures in completing or working-over wells. The most common use is to correct for faulty cement operations during original well completions. Careful study of field operations indicate that in most cases formations are broken-down at pressures far less than that required to lift the overburden, and that large quantities of drilling mud and cement may be pumped into the well (and formations) at pressures less than that of the overburden. Analyses of the forces indicate that the formations will be ruptured vertically at pressures which are to a large extend independent of the weight of the overburden, although bearing a rough relation to it. It is logical to believe that most of the cement and mud which is pumped into wells is disposed of in these vertical fissures, and as such does little if any good to the productive characteristics of the formations. This leads to the conclusion that the aim of all cement squeeze operations should be to obtain an adequate shut-off, as indicated by proper build-up pressures, with a minimum displacement pressure and amount of cement" – Abstract, p. iii.