دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a tool set temporarily in the casing or well to prevent the passage of cement, thereby forcing it to follow another designated path. It is used in squeeze cementing and other remedial cementing jobs.

n: A kind of tool for cement squeezing or remedying cementing job. Set into the casing or wellbore temporarily to stop cement slurry downflowing.

a temporary set plug to allow cement work above the tool. It is drilled out after the cement job.

n: an accessory attached to the top of the casing to facilitate cementing of the casing. It has passages for cement slurry and retainer chambers for cementing wiper plugs. Also called retainer head.

n: The servicing unit installed in the top of casing string for cementing. It is installed with rubber plug and connected with cement injection line.

a device attached to the top of the casing that allows connection of the flush and cement lines and allows plugs to be dropped. Special models may allow the cement to be rotated during cementing.

n: a scraper device run below retainers or packers to clean away debris from casing ID.

n: a plugging device used to effect a dry tubing during run in. It is opened by knocking it out of the tubing;used with retainer and packers.

n: a cast-iron or magnesium drillable tool consisting of a packing assembly and a back-pressure valve. It is used to close off the annular space between tubing or drill pipe and casing to allow the placement of cement or fluid through the tubing or drill pipe at any predetermined point behind the casing or liner, around the shoe, or into the open hole around the shoe.

n: A kind of iron casting tool with drillability.

n: see cementing head.

n: a tool used to set drillable or permanent tools, such as packers, retainers, or plugs;it can be mechanical, electric, or hydraulic.

n: A generic name for a tool or device that is used in the placement or setting of downhole equipment such as permanent packers or plugs. The running tool can be retrieved after the operation or setting process. In some cases, the running tool also is used t

n: a valve in the bottom of a retainer.

n: a downhole permanent, or drillable, packer that is set by lowering some of the weight of the tubing string onto the packer. The weight expands the packers sealing element to prevent flow between the tubing string and the casing below the packer. squeeze point n: the depth in a wellbore at which cement is to be squeezed.

a millable retainer for squeeze cementing.