دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

an older well design process of using a single joint of the heaviest wall casing in the well just below the wellhead. (Note – this restricts access of fullbore tools to all points below the joint.)

n: a plot of gamma radiation detected in a wellbore.

n: a type of radioactivity well log that records natural radioactivity around the wellbore. Shales generally pr0- duce higher levels of gamma radiation and can be detected and studied with the gamma ray tool. In holes where salty drilling fluids are used, electric logging tools are less effective than gamma ray tools. See radioactivity well logging.

a reservoir drive mechanism in which gas expansion in the gas cap pushes the oil towards the wellbore.

n: the use of the energy that arises from the expansion of compressed gas in a reservoir to move crude oil to a wellbore. Also called depletion drive. See dissolved- gas drive. gas-cap drive. reservoir drive mechanism.

flooding a oil reservoir from the top of the reservoir or an updip location, to push the oil towards a producing well.

an unexpected and unwanted entry of gas into the wellbore during drilling or well operations.

n: the process of raising or lifting fluid from a well by injecting gas down the well through tubing or through the tubingcasing annulus. Injected gas aerates the fluid to make it exert less pressure than the formation does;the resulting higher formation pressure forces the fluid out of the wellbore. Gas may be injected continuously or intermittently, depending on the producing characteristics of the well and the arrangement of the gas-lift equipment.

one of the artificial lift methods that uses gas injected down the annulus and interspersed into the flowing fluids in the tubing to lessen the density and to assist in vertical flow by gas expansion.

n pi: the teeth or tungsten carbide inserts in the outermost row on the cones of a bit, so called because they cut the outside edge of the hole and determine the holes gauge or sire. Also called heel teeth.

n: outermost tooth of cone bit.the reason of this name is that they cut
wellbore outermost part and determine the diameter of wellbore.the
outermost tooth is usually shaped II pattern、I pattern、L pattern to prevent excessive wear of the bit diameter。

n: peripheral cutting edge of blade bit 。It cut ectooecium of wellbore
and determine the diameter of the wellbore。

n: A wellbore that is essentially the same diameter as the bit that was used to drill it. It is common to find well-consolidated sandstones and carbonate rocks that remain gauge after being drilled. For clays, it is common for the hole to slowly enlarge with

a drilled hole with no washouts;the same diameter as the bit.