发明名称 |
Process and composition for cementing casing in a well |
摘要 |
A process for reducing the waiting-on-cement (WOC) time associated with the cementing of a casing string in an oil well involving the specific improvement of pumping into the well a highly retarded cement slurry containing a dispersed encapsulated accelerator, such as calcium chloride or anhydrous sodium metasilicate, wherein the encapsulating material is specifically selected such that it will melt at a temperature above the bottom-hole circulating temperature but below the bottomhole static temperature of the well to be cemented. Petroleum-derived waxes and petroleum-derived waxes in combination with vinyl resins, such as wax-compatible copolymers of ethylene and vinyl acetate, are particularly suitable as the meltable encapsulating material exhibiting excellent strength and abrasion resistance as well as serving as a moisture barrier. The improved process is particularly useful in cementing deep hot wells.
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申请公布号 |
US4036301(A) |
申请公布日期 |
1977.07.19 |
申请号 |
US19760704717 |
申请日期 |
1976.07.12 |
申请人 |
STANDARD OIL COMPANY (INDIANA) |
发明人 |
POWERS, CHARLES A.;HOLMAN, GEORGE B.;SMITH, ROBERT C. |
分类号 |
C04B20/10;C04B40/06;C09K8/46;(IPC1-7):E21B33/14 |
主分类号 |
C04B20/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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