Coring device with an improved core sleeve and anti-gripping collar
First Claim
1. An improved coring apparatus comprising:
- an outer driving structure adapted to be connected at one end to said coring bit for cutting a core in a bore hole, and at the other end to the lower end of said drill string in telescoping and co-rotatable manner therewith;
an inner barrel disposed within said outer driving structure and including a lower end portion adjacent to said bit;
means supporting said inner barrel in spaced relationship to said outer driving structure while permitting rotation of said driving structure with respect to said inner barrel;
a woven metal mesh sleeve mounted in surrounding relation on at least a portion of the exterior surface of said inner barrel, said sleeve including a leading portion adapted to be positioned within the inner barrel and initially to receive a core as it is cut,said sleeve having a predetermined normal diameter which is greater than the diameter of the sleeve in tension and a diameter when in axial compression which is greater than said normal diameter;
the portion of said sleeve which surrounds said inner barrel being compressed axially and having an inside diameter greater than the outside diameter of said inner barrel while the portion of said sleeve positioned inside said inner barrel being in axial tension to grip and compress a core received within said sleeve and having an outside diameter in tension less than the inside diameter of said inner barrel; and
means positioned within said inner barrel and connected to the leading portion of said sleeve to draw said sleeve within said inner barrel and to apply tension to the portion of said sleeve within said barrel to encase and grip said core as it is cut.
3 Assignments
0 Petitions
Accused Products
Abstract
An improved coring device that incorporates a nonrotatable inner barrel disposed within the outer driving structure of the drill string which is coupled to a coring bit. A woven metal mesh sleeve is circumferentially mounted outside the inner barrel and tucked around its lower end. The lower end of the mesh sleeve in the inner barrel is in turn connected to a stripper tube which is pulled upwardly during the coring operation. As the core is cut by the coring bit and enters the inner barrel, the woven metal mesh sleeve is disposed about the core and constricts about the core when pulled upwardly by the stripper tube. The opposing end of the woven metal mesh sleeve is connected to a weight which serves to compress the metal sleeve when outside the inner barrel, thereby increasing its diameter to prevent binding or jamming.
26 Citations
18 Claims
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1. An improved coring apparatus comprising:
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an outer driving structure adapted to be connected at one end to said coring bit for cutting a core in a bore hole, and at the other end to the lower end of said drill string in telescoping and co-rotatable manner therewith; an inner barrel disposed within said outer driving structure and including a lower end portion adjacent to said bit; means supporting said inner barrel in spaced relationship to said outer driving structure while permitting rotation of said driving structure with respect to said inner barrel; a woven metal mesh sleeve mounted in surrounding relation on at least a portion of the exterior surface of said inner barrel, said sleeve including a leading portion adapted to be positioned within the inner barrel and initially to receive a core as it is cut, said sleeve having a predetermined normal diameter which is greater than the diameter of the sleeve in tension and a diameter when in axial compression which is greater than said normal diameter; the portion of said sleeve which surrounds said inner barrel being compressed axially and having an inside diameter greater than the outside diameter of said inner barrel while the portion of said sleeve positioned inside said inner barrel being in axial tension to grip and compress a core received within said sleeve and having an outside diameter in tension less than the inside diameter of said inner barrel; and means positioned within said inner barrel and connected to the leading portion of said sleeve to draw said sleeve within said inner barrel and to apply tension to the portion of said sleeve within said barrel to encase and grip said core as it is cut. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An improved coring apparatus comprising:
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an outer telescoping supporting structure adapted to be connected at one end to said coring bit and at the other end to said drill string; an inner barrel supported within said supporting structure and including a lower end portion adjacent to said bit; intermediate tube means supported by said supporting structure and spaced radially outwardly of said inner barrel to form a chamber therebetween; flexible sleeve means positioned in said chamber and including a portion received in the interior of said inner barrel; said sleeve means being capable of assuming one diameter in axial compression and another smaller diameter in tension; the portion of said sleeve means positioned in said chamber being in axial compression and having a diameter greater than the diameter of said inner barrel, the portion of said sleeve positioned within said inner barrel being in tension and having an outer diameter less than the inner diameter of said inner barrel; and said sleeve means being mounted and supported with respect to said inner barrel to grip and compress a core received by the portion of said sleeve positioned within said inner barrel as a result of the tension applied to the portion of said sleeve within said barrel. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of coring which comprises:
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providing a core apparatus including a woven mesh core sleeve having a predetermined normal diameter greater than the diameter of the sleeve in tension; lowering said coring apparatus into a borehole and driving the same to cut a core; and maintaining a portion of said sleeve in axial compression while the remaining portion of said sleeve is in tension to grip said core as it is being cut.
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Specification