دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the depth in a well at which casing is set, generally the depth at which the casing shoe rests.2. the objective depth in a drilling contract, either a specified depth or the depth at which a specific zone is penetrated. When the depth is reached, the operator makes a decision with respect to running and setting a production string of casing. Under some farm- out and letter agreements, some owners are carried to casing point.

n: The depth of casing shoe in the wellbore.

the depth at which a casing string is set, either by design or because the mud can no longer control the pressure of the next deeper zone without adding weighting agents that would break down upper intervals.

the nominal weight per foot of the casing. Heavier weight casings of the same size are necessarily smaller I.D.

n: the curve assumed by a perfectly flexible line hanging under its own weight between two fixed points. A suspension bridge is an example of a catenary structure;an anchor chain is a catenary.

n: SrSO4, A kind of natural strontium sulfate. The SP is from 3.7 to 3.9. Usually used for heavy weight additive of drill fluid.

n: a material added to cement to change its properties. Chemical accelerators, chemical retarders, and weightreduction materials are common additives. See cementing materials.

n: The general name of treating chemical for adjust the performance of cement slurry.

n pi: a slurry of portland cement and water and sometimes one or more additives that affect either the density of the mixture or its setting time. The portland cement used may be high early strength, common (standard),or slow setting. Additives include accelerators (such as calcium chloride),retarders (such as gypsum),weighting materials (such as barium sulphate),lightweight additives (such as bentonite),or a variety of lost circulation materials (such as mica flakes).

n: The bonding material for cementing.

n: the point at which an object can be supported so that it balances, and at which all gravitational forces on the body and the weight of the body are concentrated;the centre of mass.

a lower toxicity weighting agent for brine.

a lower toxicity (than Zinc) weighting agent for higher density brines.

n: A kind of white, loose and earthy limestone whose main chemical component is calcium carbonate. Usually used for heavy weight additive of drill fluid.

an often highly porous but lower permeability carbonate composed of fine grained marine sediments such a coccoliths.