초록 ▼

The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3to 1.3 g/cm3,and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the ran

The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3to 1.3 g/cm3,and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the range 38% to 50%. The solid fraction is constitued by a mixture of lightweight particles, microcement and optionally portland cement and gypsum. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density.

대표청구항 ▼

The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3to 1.3 g/cm3,and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the ran

The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3to 1.3 g/cm3,and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the range 38% to 50%. The solid fraction is constitued by a mixture of lightweight particles, microcement and optionally portland cement and gypsum. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density. B>2CN; C1-C18alkoxy; C5-C12cycloalkoxy; C3-C6alkenyl; C7-C9phenylalkyl; C7-C9phenylalkyl which is substituted once, twice or three times in the phenyl ring by C1-C4alkyl; or is aliphatic C1-C8alkanoyl; R24is hydrogen; C1-C24alkyl or C5-C12cycloalkyl; or is C1-C24alkyl or C5-C12cycloalkyl which is substituted by 1 to 9 halogen atoms, OH, OR25,halogen, --COOH, --COOR29,--CONH2,--CONHR30,--CON(R30)(R31), --NH2,NHR30,--N(R30)(R31), --NHCOR32,--CN, COR32,--OCOR32,--CN, --NO2,--SR32,--SOR32,--SO2R32,--P(O)(OR25)2,a morpholinyl, piperidinyl, 2,2,6,6-tetramethylpiperidinyl, piperazinyl or N-methylpiperazinyl group or by combinations thereof; or is C5-C12cycloalkyl or C1-C24alkyl which is interrupted by 1 to 6 phenylene, --O--, --NR29--, --CONR29--, --COO--, --OCO--, --CH(R33)--, --C(R33)2-- or --CO-- groups or combinations thereof; or R24is C2-C24alkenyl; halogen; --SR32,SOR32; SO2R32; --SO3H; or SO3M; R26,R27and R28,independently of one another, are H, C1-C12alkyl; C2-C6alkenyl; C1-C18alkoxy; C5-C12cycloalkoxy; C2-C18alkenoxy; halogen; --C≡N; C1-C4haloalkyl; C7-C11phenylalkyl; COOR29; CONH2; --CONHR30; --CON(R30)(R31); sulfo; C2-C18acylamino; OCOR32; phenyloxy; or phenyloxy, which is substituted by C1-C18alkyl, C1-C18alkoxy or halogen; R29is C1-C18alkyl; C3-C18alkenyl; C3-C50alkyl which is interrupted by O, NH, NR or S and/or is substituted by OH; glycidyl; C5-C12cycloalkyl; C1-C4alkylcyclohexyl; phenyl; C7-C14alkylphenyl; C6-C15bicycloalkyl; C6-C15bicycloalkenyl; C6-C15tricycloalkyl; C6-C14bicycloalkylalkyl; or C7-C11phenylalkyl; R30and R31,independently of one another are C1-C12alkyl; C3-C12alkoxyalkyl; C2-C18alkanoyl; C4-C16dialkylaminoalkyl or C5-C12cycloalkyl; or R30and R31together are C3-C9alkylene or -oxaalkylene or -azaalkylene; R32is C1-C18alkyl; C1-C12alkoxy; C2-C18alkenyl; C7-C11phenylalkyl; C7-C11phenylalkoxy; C6-C12cycloalkyl; C6-C12cycloalkoxy; phenoxy or phenyl; or is C3-C50alkyl which is interrupted by --O-- and can be substituted by OH; R33is C1-C18alkyl; C2-C18alkenyl; C6-C12cycloalkyl; provided at least one G is an --OR25group; when k=2, E1and E2are a group of the formula Ia; G is C2-C16alkylene, C4-C12alkenylene, xylylene, C3-C20alkylene which is int