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Crooked hole

Kinks or bends in rope due to improper handling during installation or service. Divider interference also, wear against casing or hard shells or abrasive formations in a crooked hole. Too infrequent cutoffs on working end. [Pg.615]

Square drill collars are used to increase the stiffness of the drill string and are recommended for drilling in crooked hole areas. The spiral type of drill collar is used for drilling formations in which the differential pressure can cause sticking of drill collars. The spiral grooves on the drill collar side reduce the area of contact between drill collar and wall, which considerably reduces the sticking force. [Pg.717]

To avoid an abrupt change in hole deviation (which may make it difficult or even impossible to run casing) when drilling in crooked hole areas with an unstabilized bit and drill collars, the required outside diameter of the drill collar placed right above the bit can be found from the following formula [38] ... [Pg.717]

In general, a reasonably bad working condition should be assumed and, for that reason, a good knowledge of expected problems much as hole drag, torquing, risk of becoming stuck, tendency to drill a crooked hole, vibrations, etc., is of critical importance. [Pg.766]

Six-point bottom hole reamer. This type of reamer is run between the drill collars and the bit when more stabilization or greater reaming capacity is required. Drilling in crooked hole areas with a six-point reamer has proven to be very successful in preventing sharp changes in hole angles. [Pg.826]

Crooked hole Wellbore that has been inadvertently deviated from a straight hole. [Pg.1080]

Crooked-hole area An area where subsurface formations are so composed or arranged that it is difficult to drill a straight hole. [Pg.1080]

Fig. 14. Example of a crooked hole (a) drilled without a square collar, and a relatively straight hole (b) drilled with a square collar. (Drilco)... Fig. 14. Example of a crooked hole (a) drilled without a square collar, and a relatively straight hole (b) drilled with a square collar. (Drilco)...
Real barriers contain crooked, noncircular holes distributed in size about a mean radius in the range of 0.005 to 0.03 pm. Molar velocity throu most barrier materials is found experimentally to depend on pressures as in Eq. (14.10) ... [Pg.823]


See other pages where Crooked hole is mentioned: [Pg.767]    [Pg.783]    [Pg.798]    [Pg.826]    [Pg.826]    [Pg.1247]    [Pg.767]    [Pg.783]    [Pg.798]    [Pg.826]    [Pg.826]    [Pg.1247]    [Pg.183]    [Pg.368]    [Pg.129]    [Pg.58]    [Pg.218]    [Pg.1159]   
See also in sourсe #XX -- [ Pg.1080 ]




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Crookes

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