دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a drilling operation in which the drilling fluid is not returned to the surface;rather. it flows into an under- ground formation. Sometimes blind-drilling techniques are resorted to when lost circulation occurs.

n: a forged or cast steel fitting for a wire rope or a strand. It has a basket with adjustable bolts that secure rope ends. bridging materials n pI: the fibrous, flaky, or granular material added to a cement slurry or drilling fluid to aid in sealing formations in which lost circulation has occurred. See lost circulation, lost circulation material.

n: a thin, transparent material made from cellulose and used as a lost circulation material. See cementing milterials.

n: The transparent membrane made by cellulose. Used for sealing material.

n: the application of a liquid slurry of cement and water to various points inside or outside the casing. See primary cementing, secondary cementing. squeeze cementing. cementing barge n: a barge containing the cementing pumps and other equipment needed for oilwell cementing in water operations.

v: To prepare and pump cement into place in a wellbore. Cementing operations may be undertaken to seal the annulus after a casing string has been run, to seal a lost circulation zone, to set a plug in an existing well from which to push off with directional

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.

v: to lower the drill stem rapidly a few feet into the hole and then stop it suddenly with the drawworks brake. A surge of pressure in the mud in the drill stem and annular space results and may help to flush out debris accumulated in or on die pipe. The pressure surge may break down a formation, however, causing lost circulation, or may damage the bit if it is near the bottom.

v: Landing the drill string speedily and then braking. This operation can produce stiring pressure to clean the cutting laying up in the drill pipe. But this pressure may lead to formation fracturing or circulation loss.

n: finely shredded cellophane used as a lost circulation material for cement.

n: drilling without mud returns, as in the case of severe lost circulation.

n: a drilling operation in which no fluid is circulated back up to the surface (often as a result of lost circulation). However, fluid is usually circulated into the well to cool the bit. See blind drilling.

n: drilling without drill fluid cycling out of the well

n: a break in the earths crust along which rocks on one side have been displaced (upward, downward, or laterally) relative to those on the other side.

n: Geological term denoting a formation break, upward or downward, in the subsurface strata. Faults can significantly affect the drilling fluid and casing programs due to possibilities for lost circulation, sloughing hole, or kicks.

where rock splits or ruptures with associated movement occurs on either side.