Conductor string

This is set deeply enough to protect the borehole from caving-in in loose formations frequently encountered at shallow depths, and protects the freshwater sands from contamination while subsequently drilling a deeper hole. In case the conductor string has not been set, the surface casing is fitted with casing head and BOP. 

The production casing string for a certain well is to consist of 5-in. casing. Determine casing and corresponding bit sizes for the intermediate, surface and conductor string. Take casing data and bit sizes from Table 4-140. 

Litze, /. braid, lace, cord, string strand (Elec.) strand wire, flexible conductor, flex wire. 

The drill string, consisting of a drill bit, drill collars, drill pipe, and kelly, is assembled and lowered into the conductor pipe. Drilling fluid, better known as drilling mud, is circulated through the kelly and... 

Conductor casing string is cemented to prevent the drilling fluid from escaping and circulating outside the casing. 

By 1991, experiments with buckyballs led to long strings of the molecules that are tube- or straw-like and are called buckytubes or nanotubes. Many scientists think nanotubes are a fundamental unit for building countless other nanodevices. Nanotubes can be flexed and woven and are being woven into experimental fibers for use in ultralight, bulletproof vests, as one example. Nanotubes are also perfect conductors, and they may be used to construct atomically precise electronic circuitry for more advanced computers and flat panel displays. 

Erection and servicing of electrical utilities necessitate the use of ropes for various purposes. Braided polyester ropes worked by winches on boom trucks are used to handle transformer poles and the like. For stringing of power lines, several kilometres of a small braided polypropylene rope can be used as a pilot line this is followed by a thicker polyester braid attached to a wire rope pulling the electrical conductor. Alternatively, an aramid or HMPE rope can replace the polyester and wire ropes. 

Fig. 6 A 0.5 -inch-long grooved cobalt mandrel is inserted into tubing, which is sealed on both ends with medical adhesive. The grooves are intended to simulate the spaces between pacemaker lead conductor coils. A 1-mm-diameter hole is made in one end to assure ingress of exudate/transudate. Samples are tied together in strings, identified with a colored glass bead, and implanted in the subcutis of rabbits as shown in Fig. 3. After optical microscopic examination, the samples may be analyzed by FTIR, HPLC molecular weight, SEM, and other suitable techniques...

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