دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the seal in the annulus between a hanging pipe and the next pipe outward.

n: a means of cementing casing in a well so that the casing may, if necessary, be retrieved with minimum difficulty. A special mud, usually an oil mud, is placed in the well ahead of the cement after the casing has been set. Nonsolidifying mud is used so that it does not bind or stick to the casing in the hole in die area above the cement Since the mud does not gel for a long time, the casing can be cut above the cemented section and retrieved. Casing packs are used in wells of doubtful or limited production to permit reuse of valuable lengths of casing.

n: The cementing method that flow in some non-petrified special fluid at first before cementing. The casing above cement can be retrieved since this kind of drill fluid is non-condensing.

n: The packer is connected at the suitable part of casing string and trapped in the well to adjust for payzone. There are two non-return valves and a pilot valve. Open the pilot valve when reach to the certain pump pressure in cementing. The cement slurry en

v: to cement casing in a well in a way that allows for easy retrieval of sections of casing. See casing pack.

external casing packer.

n: the rubber tools of hydraulically operated packoff colsed on the casing and connected in the place where the layer should be packed off


a rubber bladder over a section of casing that is inflated, usually with cement, to give an annular seal in open hole sections. Frequently used with liners and set at intervals along the open hole.

n: refer to external casing packer.

abbr: initial circulating pressure;used in drilling reports.

inflatable casing packer.