دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: balls made of nylon, hard rubber, or both and used to shut off perforations through which excessive fluid is being lost.

n: Made by nylon or ebonite. Used to block off the opening in the capital string and prevent fluid lossing when fracturing.

small, rubber-covered, hard centered balls that can seal individual perforations during a chemical treatment.

n: a bridge plug or cement plug placed near the bottom of the bole to shut off a depleted, water-producing, or unproductive zone.

n: Refers to the cement plug or bridge plug located in the downhole, used to packoff depleted formation and water yield formation.

a deliberate shut off of a zone by a downhole valve or other method, to prevent cross flow.

v: a kind of link tool with valve ,able to be buckled on the joint top of drilling pipe and lock tight and seal automaticly

n: a hinged closure mechanism operating in a pivot manner. used to shut off tubing flow. Also called a kickstand valve.

A one-way, flow actuated valve common in safety valves, coiled tubing and fluid loss devices.

n: a certain method of kill-well when it was not permitted to shut off.

n: a mud whose density is high enough to produce a hydrostatic pressure at the point of influx in a wellbore and shut off flow into the well.

n: a liquid. usually salt water or oil. but sometimes mud. used in a well when a packer is between the tubing and the casing. Packer fluid must be heavy enough to shut off the pressure of the formation being produced. must not stiffen or settle out of suspension over long periods of time. and must be non-corrosive.

n: any fluid placed in the annulus between the tubing and casing above a packer. Along with other functions, the hydrostatic pressure of the packer fluid is utilised to reduced the pressure differentials between the formation and inside of the casing and acr

the fluid left in the annulus behind the packer. It may help offset pressure in the tubing or help reduce thermal losses.

n: a fluid-pressure test of the casing. Also called a cup test.

n: it uses the casing pressure test. Usually lower the packer below milled section of kelly bar or below the the surface of cement out of casing, after the packer laied, shut off the blowout preventer, then test of pumping clear water through cross.

n: a device that controls the rate of flow of fluid in a line or opens or shuts off the flow of fluid completely. When open, the sealing surface of the valve is moved away from a seat;when closed, the sealing surface contacts the seat to shut off flow. The direction of movement of the valve is usually perpendicular to the seat. Poppet valves are used extensively as pneumatic (air) controls on drilling rigs and as intake and exhaust valves in most intemalcombustion engines.

a type of valve common on early subsurface safety valves, where higher than expected flow through an orifice can move a round ball onto a sealing surface and stops the flow.