US1806079A - Core drill - Google Patents

Description

May 19, 1931. Y J. 5. MITCHELL CORE DRILL Filed Nov. 5, 1923 P its length Patented May 19, 1931 warren smras PATEN'E ore-ice Joanna s. moment, or cnrcaeo, rumors, essreuon ro seamen trauma? comm, a conromrron or messacnusnms conn nnrnn Application filed November 5, 1928. Serial No. 672,794.

My invention relates to core drills.

It has for its object 'to provide an improved core'barrel, and, more particularly, an improved core barrel especially adapted to use Lg with mud fluid in oil or gas well drilling and having ample space for the fluid whereby sticking of the bit and corebarrel is avoided.

In the accompanying drawings I have shown for purposes of illustration one form 19 which my invention may assume in practice.

In-these drawings,--

Fig. 1 is a vertical longitudinal sectional view of the bit carrying portion of my improved barrel.

Fig. 2 is a transverse section on line 22 of Fig. 1.

Fig. 3 is a side elevational view of the complete core barrel.

Fig. 4: is a transverse sectional view taken il roggh the barrel member on line 4-4 of n this illustrative construction I have shown a barrel of the general type described and claimed in m co ending application as Ser. No. 579,038, ed ug. 1, 1922, and including a bit 1 and a barrel member 2', both herein being of improved construction and the latter carrying therein a core lifter 3.

In my improved construction the bit 1 is so of cruciform cross section and provided with wings 4 spaced apart by external vertical flui passages5 of even greater area than those described in my above mentioned application. This bit is herein also provided with vertical fluid passages 6 of suitable area in the form of grooves in the peri hery of the core passa e 7. Moreover, it will be noted that the bit carries on its upper end, four clutch teeth-8 adapted to be receivedin corbarrel member 2 and to be attached thereto having their heads 11 countersunk in the 5 working face of the bit between the usual one of these teeth ma be longer than the others as indicated in otted lines in Fig. 1. As illustrated, the barrel member 2 is l kewise oi cruciform external shape throughout (see Fig. 3) v and preferably of exresponding openings 9 in the lower end of the diamonds thereon (not shown). If desired" or expansible type usually permitting sufi 'cient fluid flow therethrough. If desired,

enough jfluid passages 12 may also be provided in the conical lifter supporting surface on the member 2, adapted to register with the passages 6 in the bit, so :that the total flow area of these assages and the ordinary slots in the core 1i er will be substantially equal to'the area of the passages 6 in the bit.

As a result of my improved construction it will be observed that efiective wings adapted to slap the mud fluid into the walls of the hole are provided on the bit and barrel at the same time that provision is made for the passage of a large amount of mud fluid to the 70 bottom of the hole bud for the upward passage of the same along the bit and barrel, the construction being such as materially to lessen the danger of the barrel sticking in a hole. It will further be noted that by reason 7e of the clutch type connection between the cruciform bit and barrel, the desired registry of the external passages in the fiuted r cruciform bit and barrel may be obtained with facility while the parts may be readily separated when desired and the core lifter may be removed from the upper end of the barrel Moreover, through the provision of a longer tooth, registry of non-symmetrlcal passages 12 with certain assages 6 may be assured. 5 While I have in this application specifically described one form w "ch my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from? its spirit or the scope of the ap nded claims.

What I claim as new and desireto secure by Letters Patent is;

1. A core barrel comprising a win ed bit, a win ed core receiving barrel mem r detachab y connected thereto, and a core lifter their length and having internal passage means, the passage means in said barrel 1ncludin 'passa e means formed in the internal w of said barrel member around said 5 core lifter.

2. A core barrel havmg a winged bit and a core receivin barrel member. of the s'ame general-winge shape, said elements being of the same sharge substantially throughout m the length of the arrel and each having fluid passages formed therein, and means for causing connection of said bit and barrel memher with the win s and fluid gassa es of one i in registry with t e wings an flui passages 15 of the other, said means including clutch teeth on adjacent elements.

3. A core barrel having a winged bit and a winged core receivin ,barrelmember of the same general winge shape, said elements 0 being of the same shape substantiall throughout the length of the barrel and eac having fluid passages formed therein, and means for ca connection of said bit and barrel member with the win s and fluid passages of one in registry wit the wings and fluid passages of the other, said means including clutch teeth on adjacent elements and screws connectin the same and countersunk in the working ace of the bit.

30 4. A core barrel comprising a core receiving barrel member having an internally fluted bore and a core lifter carried in sa1d bore and directly engaging the walls of the latter, said internal utes forming fluid passages 35 externally of the core lifter.

5. A core barrel having an externally and internally fluted core receiving portion, an externally and internally fluted bit carried thereon and a core lifter carried directly as by the internally fluted portion of said barrel, the internal flutes in said core receiving portion'forming fluid passages externally of said core lifter.

6. A core barrel comprising an internally 5 and externally fluted core receiving barrel member a bit carried'by said member having flutes ed:v with the flutes in said barrel member, and a core lifter slidably carried directly by said'barrel member the internal so flutes in said barrel member forming fluid passa eg rternally of said core lifter. 7. core barrel comprisin a core receiving barrel member having an internally fluted conical bore and a tapered core lifter carried 6 in and bore and directly on the walls of the latter, said internaf ii te s forming fluid peassages externall of the core lifter.

In stlmony whereo Iaflix m ature.

JOSEPH 8. LL.

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