US1791370A - Drilling and coring tool - Google Patents

Description

- Feb 3, 193i. J. N. oKsi-:NHOLT ET AL Lgm DRILLING AND CORING TOOL I Filed Sept. 28, .1.926

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Patented Feb. 2a ila'l NETE@ STATES tratan PATENT @FFECJ .TENS N. OKSENHOLT AND JAMES A. COLEMAN, OF JENA, LOUISIANA.

DRILLNG AND CORING TOOL Application led September 28, 1926. Serial No. 138,306.

'lhis invention relates to an improved drilling and coring tool.

The object of the invention is to provide a drilling and coring tool which will form .1; and retain a sample of the formation and which is so constructed and organized that the core may be readily taken from the tool. Another object resides in the provision ot a device of this character wherein provision is made for effective drilling and coring and for the circulation of water or other Huid during the drilling and coring opera-tion.

Other objects and advantagesreside in cer tain novel features of the construction, ar- '..o' rangement and combination oparts which will be hereinafter more fully described aud particularly pointed out in the appended claims, reference being had to the accompanying drawings forming a part of this specification, and in which :d

Figure 1 is a view partly in side elevation and partly in section showing the lower portion of a tool embodying the present invention,

Figure 1n is a similar view of the upper portion vofthe tool shown in Figure 1,

Figure 2 is a plan view of the lower end of the tool7 Figure 3 is a view in transverse vertical section of the lower portion of the tool,

Figure 4 is a detail perspective view ot' one of the drilling cutters,

Figure 5 is a fragmentary sectional detail taken on the line 5 5 of Figure 2, and

Figure 6 is a similar sectional detail taken on the line 6-6 o'fFigurc 2.

eferring to the drawings it will beseen that the tool comprises a one piece tubular body 1 having a plurality, preferably three, longitudinally extending and outwardly projecting ribs 2. At the lower ends of the body slots 3 are Jformed therein and in the ribs 2 and these slots extend transversely of the body and are smaller attheir lower than at 15 their upper ends, these slots tapering or gradually decreasing in size from their upper to their lower ends. In the slots 3 the correspondingly tapered attaching portions 4 'of the drilling cutters 5 are mounted. The cutters 5 are held in position in the slots 3 by virtue of the tapered form of the slots and the corresponding tapered form of the attaching portions 4 of the cutters and by virtue of the securing action of a cylindrical coring member 6, the cylindrical coring member 6 having a reduced and externallythreaded upper end 7 threadedly engaged with the tubular body 1 and abutting the inner ends of the attaching portions 4 of the cutters tohold the cutters 5 in position. The lower end of the coring` member 6 is provided with cutting teeth 8.

The upper end of the tubular body 1 is provided with a reduced externally threaded extension 10 thread'e'dly connected or otherwise suitably secured to the lower face of the drill pipe 12.

The coring member 6 has its longitudinal opening 11 tapering gradually from a small lower end of a large upper end and this formation of the coring member tends to retain the core in the member and in the core barrel 12 which the longitudinal bore of the tubular body 1 provides. At the upper end of the tubular body 1 a tubular core barrel eXtension 15 is provided, the core barrel extension being of any suitable length but preferably being of substantial length. rlhe lower end of this core barrel 15 is threadedly connected with the upper end of the tubular body l and beyond its threaded connection with the tubular body 1 this extension 15 is located within the drill stem. At its upper end the extension 15 is provided with a valve seat 1G with which a ball Valve 17 co-acts. A cage 18 is provided for the bal'l valve. The ball valve 17 controls the communication of the interior of the extension 15 with the interior of the drill stem. As the extension 15 is smaller in diameter than the drill stem a space 20 is provided between the outside of the extension 15 and the inside of the drill stem and through this space 2O the circulating fluid is pumped. From the space 2O the fluid passes through longitudinal openings 21 formed in the stock or material of the tubular body 1. These openings 21 extend all the way down through the body 1 and their lower ends discharge below the body and adjacent longitudinally extending slots 22 formed at the fitti outer surface of the coring member 6 so that the circulating fluid not only courses around the cutters 5 but also travels down to and courses around the cutting teeth 8. rthe passage of the fluid through the slots 23 decreases the resistance which the formation sets up to the rotation ot the coring meinber 6.

In operation the cutters 5 serve to carry out the drilling of the well and simultaneously with their operation the teeth S cut a core from the formation and the core so cut passes up through the coring nielnber (i and into the barrel l2. 'Ehe tap-ered formation ot the coring inember (i tends to retain the core in position and this function is enhanced by the section of the valve lli which permits displacement ot' iuid out ot the core barrel and which auton'iatically closes to prevent escape of the core.

lWe claim l. fla core bit comprising a tubular body, radially otlset ribs spaced about the outer side of said body, said ribs having slots opening inwardly ot the saine and into the bore ot said body? cutters disposed beneath said ribs and having,` portions engaged in the said slots, and a cylindrical core cutter seated in the lower end et the bore of said body and abutting the inner sides et the engaged portions of said cutters to locl the latter in position.

2. t core bit comprising a tubular bodyi radially offset ribs at the outer side ot said body and having their lo Per ends disposed substantially in the plane et the lower end ot the latter, said ribs haying slots opening inwardly ot the saine and into the bore ot' said body, cutters disposed beneath said ribs and having reduced portions 'formed there with to be engaged in the said slots a shoulder formed at the outer side ot each ot said cutters and engageable with the lower end of the. coinplernental oi said ribs, and a cylindrical core cutter seated in the lower end of th-e bore ot said body and abutting the inner sides of the engaged portions ot said cutters to lock the latter in position.

3. A corel bit comprising a tubular body7 radially odset vertical ribs spaced circumterentially about the outer side of said body and having their lower ends projecting slightly below the lower end et the latter, said ribs having slots opening outwardly ot the lower ends oic the same and into said body., cutters disposed beneath said shoulders and having portions engaged in the said slots, said slots being tapered in a downward direction for inter-locked engagement with the engaged portions of said cutters9 and a cylindrical core cutter seated in the lower end ot the bore of said body and abutting the inner sides of the engaged portions ot said cutters to lock the latter in position.

t. A core bit comprising a tubular body9 Merate radially odset vertically elongated ribs spaced circumterentially about the outer side of said body and having their lower ends projecting slightly below the lower end of the latter, said ribs having slots opening outwardly ot the lower ends ot' the same and into said body, cutters disposed beneath said shoulders and having portions engaged in the said slots, said slots being tapered in a downward direction for interlockcd engagenient with the engaged portions of said cutter, a cylindrical core cutter seated in the lower end ot the bore of said body and abutting the inner sides ot the engaged portions of said cutters to lock the latter in position, and water courses passing downwardly ot' said body in planes between the said ribs and adjacent the leading edges of said cutters.

JENS N. @lSElill-llfl. JAMES d. COREE/leiht.

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