US2306369A - Coring apparatus - Google Patents

Description

Dec. 29, 1942. D'. D. ANDERSON 2,306,369

` coRING APPARATUS Y K Filed sept.' 22, 1941 El rwwmwg Hbc/arson,

Patented Dec. 29, 1942 CORING APPARATUS Dwight D. Anderson, Houston,

Tex., assigner to Reed Roller Bit Company, Houston, Tex., a corv poration of Texas Application September 22, 1941, Serial No. 411,822

-3 Claims. (Cl. Z55-72) This invention relates to coring apparatus and has for its general object the provision of a coring apparatus in which the core will be protected from disintegration during the coring operation.

In the usual coring apparatus a core drill is employed which makes an annular cut and leaves a core standing in the center of the hole cut. This core is received within a core barrel normally disposed within the core drill and extending upwardly therefrom into the drill collar on drill stem. Some such core barrels are fixed in place and can only be removed by removing the drill from the hole, while others are adapted to.

be removed by means of a wire line after a core has been taken. In every instance, however,'the core is fed into the core barrel, and it has been found that under many circumstances it will, in feeding into the core barrel during the cutting of the core, tend to disintegrate because of its rubbing action against the wall of the core barrel, and may jam up in the core barrel and prevent the taking of additional core.

It is an object of this invention to provide a. means which will maintain a space within the core barrel between the walls of the core barrel and the body of the core, so that iiuid may ow around the core `and keep it lubricated at all times.

It is a further object of this invention to provide such a device which will prevent disintegration of the core and will also tend to prevent the core from jamming in the core barrel.

A further object of this invention is to provide such a structure which will be extremely simple and inexpensive, which will be fool-proof and require substantially no attention, which will take up very little space within the core barrel and will not interfere with the movement of the core, and which will accommodate a core of substantially any length desired.

Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawing, wherein is illustrated one embodiment of the invention.

In the drawing: s

Fig. 1 is a View in vertical cross section showing a coring apparatus withv the protector constructed in accordance with this invention `in place therein and illustrating the action of the device during the taking of a core;

Fig. 2 is a vertical cross section through a portion of the` core barrel illustrated in Fig. 1 and showing the manner of mounting this invention in place therein.

In the drawing the numeral I designates the usual drill collar to which is secured on its lower end the drill bit 2 by means of the threads 3. 'I'his drill bit 2 is provided with cutting blades 4 of any desired number and type and with slush passages 5 leading to the cutting blades.

Within the bit head of the bit 2 and above the blades thereof is disposed the seating ring 6 that is adapted to receive the shoulder 'l on the nipple 8 forming a part of the core barrel, this being attached to the lower end of the core barrel proper indicated at 9. On the lower end of the nipple 8 is carried the c oring head I0 and within this coring head ismounte'd the core catcher II which serves to break off the core when the core barrel is raised and retain the core in the core barrel while it is being removed from the hole.

The upper portion of the nipple 8 is formed with substantially the same internal diameter as the core barrels, but adjacent its lower end this nipple 8 is formed with `a part of smaller internal diameter I2. At the point of juncture between these portions of larger and smaller diameter there is provided'a radially extending circumferential groove diameter than the upper portion of the nipple 8.

Disposed initially within the nipple 8 is the spring I4. This spring has coils of substantially the sainek diameter throughout the major portion of its length but of progressively smaller diameter adjacent its upper end as shown at I5 to substantially close the upper end of the spring. At its`lower end this spring is formed with one turn I5 of larger diameter than the remaining` turns of the spring, this turn of the spring being adapted to t within the'groove I3 so as to retain-the lower end of the spring against upward or downward movement within the nipple 8. The spring I4 is made very flexible so that it may stretch easily the entire length of the core barrel and accommodate a core of full length without the exertion of a large amount of force thereon. Also, it is made of a relatively iine gauge of wire so that it will occupy but little space within the l core barrel and will leave the core free to move upwardly in the core barrel without interference, serving only to space the core from the walls of the core barrel in order that uid might circulate between the core and the core barrel.

In operation, the spring I4 will be inserted into place in the nipple 8 before the core barrel is assembled. After assembly the core barrel, with the spring in place therein and in the condition illustrated in Fig. 2, will be lowered into the hole. The drill stem will then be rotated to cause the I3 that is of even greater internal drill I to drill ahead and form the core l1 at the center of the hole. As this core is formed it will advance upwardly in the core barrel and upwardly through the hollow central portion of the spring Il until it comes in contact with the upper end thereof. Thereupon it will lcontinually move upwardly stretching the spring Il as it moves but during the entire movement from the time it enters the lower end of the spring Il it will be held out of contact with" the wall of the core barrel and fluid may circulate therebetween. It will be prevented from disintegrating contact with the wall of the core barrel and will be held together so as to prevent it from Jamming up in the core barrel.

Having described my invention, I claim:

l. In a coring device, a core drill, a core barrel therein, and an extensible coil spring within said core barrel adapted to receive a core entering said core barrel and to space the same from the walls of said core barrel, said coil spring having a turn adjacent t`s ameter than the remainder of said spring, and said turn of larger diameter being disposed within a circumferential groove inside said core barrel to prevent upward movement of the lower end of said spring.

2. In 'a coring device. a core drill, a core barrel lower end of substantially larger dicore barrel adapted to receive a core entering said core barrel and to space the same from the walls of said core barrel, said coil spring being substantially closed at its upper end and having its lower end anchored to the inner wall of said core barrel adjacent the lower end of said core barrel.

3. A spacer for spacing a core from the interior of a core barrel and for holding said core together'to prevent its disintegration, said spacer `comprising a helically wound coil of spring wire of a diameter adapted to fit within said core barrel, said wire being formed with a turn of larger diameter than the remainder of the turns at one end thereof whereby it may be anchored to the interior of said core barrel, and being formed with turns of smaller diameter than the remainder of its turns adjacent the opposite end thereof to substantially close the upper end of Vsaid spacer and prevent a core from passing out through the upper end thereof.

DWIGHT D. ANDERSON.

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