US1761292A - Core barrel - Google Patents

Description

June 3, 1930. J. G. BONE 1,761,292

CORE BARREL Filed Aug. 14, 1929 2 Sheets-Sheet 1 war .3 Z

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CORE BARREL Filed. Aug. 14, 1929 2 Sheets-Sheet 2 \NvEN-roR Jess? 6.30m:-

- Patdiited June 3, 1 930 JOSEPH e. Bonn, or LONG BEACH, mama cons BARREL Application filed August 14, 1929. Serial No. 385,838.

This invention relates to a core barrel particularly useful in obtaining cores during the drilling of an oil well.

The prime object of my invention is to provide a novel means for completely closing the lower end of the barrel as the barrel is lifted off of the bottom of the hole, so that all of the core in the barrel is retained, and can not be lost while the tool is being removed.

' from the well. Another object isto provide a novel and efiective automatic means for closing the lower end of the core barrel as the tool is lifted preparatory to removing the same from the well. 1

Other objects, advantages and features-of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In thedrawlng:

Figure 1 is -a side elevation of my barrel 7 with parts broken away to show interior construction.

v Figure 2 is a sectional View taken on line 2-2 of Figure 1. Figure 3 is a sectional View taken on line 3-3 ofFigure 1.

Flgure ids an enlarged fragmentary sectionalview of the lower partof the barrel.

Figure 5 is a plan view of one of the closure segments.

Figure 6 is an end view of the same.

Figure 7 is a fragmentary longitudinal sectional view of the core barrel. I

Figure8 is an enlarged fragmentary longitudinal sectional view-of the lower part of the core barrel. w

Figure 9 is a sectional Viewv taken on line 9--9 Figure 8.

Figure 10 is a sectional view taken on line 1010 Figure 8.

Figure 11 is a sectional view on the same line as Figure 10 with part of the closure segments broken away to show concealed structure.

Figure ,12 is a sectional view on the same line as Figure 10 and showing the closure segments in open position.

Referring more particularlyto the draw-F .ing, the numeral 1 indicates the head of my 1 core barrel, which may consist of a plurality of members, each screwed into the other a so as to form the completed head. ,The purpose of the various pieces is to provide a means of assembling the core barrel. An 5 outerbarrel 2 screws into the-head 1 and depends therefrom. A mandrel 3 extends into the head 1 and is slidably, but nonrot'atably held in the head by means of an,

elongated squared section 4 which fits into a squared opening 5. A suitable coupling 6 such as a threaded pin is provided on the top of the mandrel 3 whereby the mandrel is coupled to drill pipe or the like.

A packing nut 7 screws into the top of the head 1 and fits around the mandrelt'o prevent the leakage of fluid downwardly past the mandrel. A shoulder 8 is provided in the head 1 against which thesection 4 strikes, to limit the upward movement of the mandrel in the head, whereby the entire tool may be removed from the well by lifting upon the mandrel. The downward movement of the mandrel is limited in a similar manner by a; shoulder 9.in the lower end of the head.

An inner core retaining barrel 10 screws on to the lower end of the mandrel 3, and said core retaining barrel extends downwardly through the outer barrel 2. A threaded pin 11 or the like is providedonthe lower end of so the barrel 2, or upon the cage-12 to receive the coring head. This head is of well known and usual constructionand forms no part ofthis invention. g A cage 12 screws on to the lower end of the lower end thereof, which flange extends out- Y wardly into the cage 12. This flange serves to limit the longitudinal movement of the sleeve 13 for a purpose to be further described.

A plurality of cam slots 15 are cut through the sleeve ,13 and the inner barrel 10 is provided with pins 16 which fit and extend into the slots 15. It will be seen that when the mandrel 3 and inner barrel 10 are raised or lowered, the pins 16 moving in the cam slots 15 will cause the sleeve 13 to rotate. sleeve must rotate since the mandrel is nonrotatably held in the head. The rotation of the sleeve 13 will cause the bottom of said sleeve to be closed by the following means: A plurality of arcuate closure segments 17 are pivotally secured to the flange 14 at one end thereof, and at the other end of each segment I provide a pin 18 which extends downwardly into a slot 19 in the bottom of the cage 12. Rotation of the sleeve 13 will cause all of the segments to move inwardly upon their pivots in the flange 14: as shownin Figure 10. When the sleeve is rotated in the opposite direction, the segments are all moved into the position shown in Figure 12, thus leaving a non-restricted opening into the inner core retaining barrel.

The raising or lowering of the mandrel" 3 will open or close the segments 17 so that the core barrel is free to receive the core during the drilling operations, but it is instantly closed to trap'the core when the mandrel is raised to remove the barrel from the well.

Having described my invention, I claim 1. A core barrel comprisin an outer barrel, an inner barrel within said outer barrel, means slidably mounting said inner barrel, pipe coupling means on the top of said inner barrel, a sleeve rotatably mounted on said inner barrel, means coupling said sleeve and inner barrel whereby the sleeve is rotated as the inner barrel is raised or lowered, and means on said sleeve adapted to extend across the inner barrel when said inner barrel is raised. v

2. A core barrel comprising a head, an outer barrel depending from the head,.a mandrel extending into the head, means slidably and 'non-rotatably mounting the mandrel in the head, pipe coupling means on the mandrel, an inner barrel dependin from the mandrel, said inner barrel extending into the outer barrel, a sleeve slidably and rotatably mounted on the inner barrel, means coupllng said sleeve and inner barrel whereby said sleeve is rotated as the inner barrel is ra sed or lowered, and means mounted on said sleeve extending across the inner barrel when said inner barrel is raised.

3. A core barrel comprisingv a head, an outer barrel depending from the head, a mandrel extending into the head, means slidably and non-rotatably mounting the mandrel 1n the head, pipe coupling means on the This mandrel, an inner barrel depending from the mandrel, said inner barrel extending into the outer barrel, a sleeve slidably and rotatably mounted on the inner barrel, means coupling said sleeve and inner barrel whereby said sleeve is rotated as the inner barrel is raised or lowered, a plurality of arcuate closure segments pivotally mounted on said sleeve and means pivotally mounting one end of said segments to the outer barrel.

1. A core barrel comprising a head, a mandrel extending into said head, a square section on said mandrel, said head having a square bore to receive the section, an outer barrel depending from the head, an inner barrel depending from the mandrel, a sleeve slidably and rotatably mounted on the inner barrel adjacent the lower end thereof, said sleeve having cam slots formed therein, lugs on the inner barrel fitting into said cam slots whereby the sleeve is rotated when said inner barrel is raised or lowered, and closure means on said sleeve extending across said inner barrel when the inner barrel is raised.

5. A core barrel comprising a head, a mandrel extending into said head, a square section on said mandrel, said head having a square bore to receive the section, an outer barrel depending from the head, an inner barrel depending from the mandrel, a sleeve slidably and rotatably mounted on the inner barrel adjacent the lower end thereof, said sleeve having cam slots formed therein, lugs on the inner barrel fitting into said cam slots whereby the sleeve is rotated when said inner barrel is raised or lowered, a plurality of arcuate closure segments pivotally mounted on said sleeve and means pivotally securing one end of said segments to the outer barrel.

.6. A core barrel comprising a head, a mandrel extending into said head, a square section on said mandrel, said head having a square bore to receive the section, an outer barrel depending from the head, an inner barrel depending from the mandrel, a sleeve slidably and rotatably mounted on the inner barrel adjacent the lower end thereof, said sleeve having cam slots formed therein, lugs on the inner barrel fitting into said cam slots whereby the sleeve is rotated when said inner barrel is raised or lowered, a cage secured to the lower end of the outer barrel, a flange on the sleeve extending into the cage whereby the longitudinal movement of the sleeve is limited, a plurality of arcuate closure segments pivotally secured to the flange, at one end thereof, and means pivotally mounting the other end of said segments'to the cage.

7. A core barrel comprising a head, a mandrel extending into said head, a square section 011 said mandrel, said head having a square bore to receive the section, an outer barrel depending from the head, an inner barrel depending from the mandrel, a sleeve slidably and rotatably mounted on the inner barrel adjacent the lower end thereof, said sleeve having cam slots formed therein, lugs onthe inner barrel fitting into said cam slots whereby the sleeve is rotated when said inner barrel is raised or lowered, a cage secured to the lower end of the outer barrel, a flange on the sleeve extending into the cage whereby the longitudinal movement of the sleeve is limited, a plurality of arcuate closure seg ments pivotally secured to the flange at one w end thereof, a pin depending from the free end of each of said segments, said cage having slot-s formed therein into which said pins extend.

v In testimony whereof, I aflix my signature.

I JOSEPH G. BONE.

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