| 摘要 |
<p>This invention relates to a cement composition for cementing oil, gas and geothermal wells comprising: a cement; and an additive comprising a blend of a sodium silicate; water; a carrageenan suspending agent; a sodium polyacrylate; an AMPS terpolymer; a dispersant; and a cellulosic water soluble polymer. The dispersant may comprise a sulfonated naphthalene formaldehyde condensate or a sulfonated ketone acetone formaldehyde condensate. The cellulosic water soluble polymer may comprise HEC or CMHEC. The invention can also function to reduce the occurence of gas channelling and stabilize foam created by adding nitrogen gas to cement.</p> |
