Well-cementing method using a spacer composition

Claim 1

A method according to claim 1 wherein said material is selected from (1) halides, hydroxides, borates, and sulfates of alkali metals; (2) hydroxides, phosphates, phosphites, and borates of alkaline earth metals; (3) metaphosphoric acid or boric acid; (4) lignosulfonates of alkali metals, alkaline earth metals, Cr, Fe, Mn, Co, Ni, Mo, and W; (5) acids of the formula where R2 is (1)- OM and M is hydrogen, R, alkali metal, alkaline earth metal, Zn, Sn, and Pb or (2) hydrogen; R is (1) alkyl having from one to 20, inclusive, carbon atoms per molecule, (2) cycloalkyl having from three to 20, inclusive, carbon atoms per molecule, (3) aryl having from six to 20, inclusive, carbon atoms per molecule, (4) hydrogen, or (5) where n varies from zero to 20, inclusive, Y is (a)- COOM (where M is as defined above), (b)- OH, (c) hydrogen, or (d) the Y''s being the same or different in any given molecule; R1 is selected from the same radicals as R and is the same or different from R in any given molecule; (6) acids of the formula where M is as defined above, R4 is alkyl, cycloalkyl, or aryl as defined for R above, or hydrogen, or and Y is as defined for R above; and R5 is selected from the same radicals as R4 and can be the same or different from R4 in any given molecule; (7) carbohydrates; (8) acids of group 5 having from one to 10, inclusive, hydroxy substituents; (9) anhydrides of the acids of groups 5, 6, and 8; and (10) oxides, halides, and carbonates of Zn or Pb.