Boring or penetrating the earth – With magazine for successively moving unconnected – oriented...
Patent
1987-07-07
1989-07-25
Novosad, Stephen J.
Boring or penetrating the earth
With magazine for successively moving unconnected, oriented...
175 57, 175 85, 414 2263, E21B 1920
Patent
active
048504394
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of drilling a bore well by means of drilling equipment which comprises a drill floor or platform with a derrick extending upwards therefrom, a first hoist connected to the upper part of the derrick for passing a tubular body which includes a plurality of releasably interconnected tubular body sections through a drilling opening defined in the drill floor which also defines a storage area for storing tubular body sections, and transporting means for transporting tubular body sections from the storage area to the first hoist and vice versa.
In rotary drilling two different types of equipment are commonly used for rotating the drill string, viz. the so-called top drive and the rotary table drive. Before starting actual drilling operations, a conductor pipe is rammed into the ground at the drilling side, and thereafter a so-called bottomhole assembly comprising a drill bit, drill collars and possible other tubular elements or sections, is mounted while suspended above the drilling opening in the drill floor by means of the said first hoist. The bottomhole assembly may now be lowered into the conductor pipe, and drilling operations are started by rotating the bottomhole assembly by means of the top drive or the rotary table cooperating with a kelly attached to the bottomhole assembly. When the drill bit has penetrated such a distance into the underground that only a small part of the drill string extends upwards from the upper surface of the drill floor, the drilling operation must be stopped, whereafter the drill string is fastened to the drill floor by means of wedge-shaped elements--so-called slips--which are positioned in the space between the drill string and the main bushing defining the drilling opening in the drill floor. The top drive or the kelly may then be disconnected from the drill string, and a tubular drill string section is now moved from a storage site or rack positioned outside the drill floor and supporting a stock of drill string sections in a horizontal position. Each drill string section is brought in from the rack to the drill floor by means of an auxiliary hoist or tackle through a so-called V-door formed in the derrick, and the new drill string section is placed vertically in a holding socket--the so-called mousehole--formed in and extending downwards from the drill floor and positioned adjacent to the drilling opening. When the top drive or the kelly has been disconnected from the drill string extending through the drilling hole, the top drive or kelly may be swung to such a position that it may be connected to the upper end of the drill string section positioned in the mousehole. Now, the new drill string section is lifted from the mousehole to a position in which its lower end may be connected to the upper end of the drill string, and after releasing the slips from the drilling opening, the drilling operation may be continued. Normally, the length of the drill string sections is 30 feet or about 10 m. This means that each time the drill bit has penetrated further 10 m into the underground, the drilling operation has to be stopped, and a further drill string section has to be added as described above.
The bore well which has been drilled, is normally provided with a tubular lining, the so-called well casing. As the drilling proceeds, the well casing also has to be prolonged by adding casing sections, which normally have a length of about 15 m each, and which are brought in from a storage site positioned outsite the drill floor.
From time to time it is necessary to remove the total drill string from the bore well, for example in order to replace the drill bit or the total bottomhole assembly, by a so-called tripping-out operation. Then the drill string is normally withdrawn from the bore well stepwise, and in each step a drill string length--a so-called stand--each normally comprising two (double) or three (triple) interconnected drill string sections is disconnected. These stands, which may be doubles having a length of about 20 m or triples
REFERENCES:
patent: 2730246 (1956-01-01), Stone
patent: 3533516 (1970-10-01), Guier
patent: 4348920 (1982-09-01), Boyadjieff
patent: 4421179 (1983-12-01), Boyadjieff
patent: 4423994 (1984-01-01), Schefers et al.
patent: 4610315 (1986-09-01), Koga et al.
patent: 4709766 (1987-12-01), Boyadjieff
Dansk Industri Syndikat A/S
Melius Terry Lee
Novosad Stephen J.
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