发明名称 |
PROCESS FOR CEMENTING CASING IN A WELL |
摘要 |
<p>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.</p> |
申请公布号 |
CA1070236(A) |
申请公布日期 |
1980.01.22 |
申请号 |
CA19790332198 |
申请日期 |
1979.07.20 |
申请人 |
STANDARD OIL COMPANY |
发明人 |
POWERS, CHARLES A.;HOLMAN, GEORGE B.;SMITH, ROBERT C. |
分类号 |
E21B33/14;(IPC1-7):21B33/14 |
主分类号 |
E21B33/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|