Support casing for a boring head

• US 3,901,331 A
• Filed: 12/03/1973
• Issued: 08/26/1975
• Est. Priority Date: 12/06/1972
• Status: Expired due to Term

• Current Assignee: Branko Djurovic
• Original Assignee: Branko Djurovic
• Inventors: Djurovic, Branko
• Primary Examiner(s): Brown, David H.
• Application Number:
  US05/420,838
• Time in Patent Office: 631 Days
• Field of Search: 175/92,101,103,107,171,173,257,258,260,261,62,171
• US Class Current: 175/171
• CPC Class Codes: E21B 7/208 using down-hole drives E21B7/203 and E21B7/206 take precedence

Abstract

Drilling apparatus for installing casing while drilling in which a mobile head is connected to the lower end of a casing by bearing means. A drilling pipe string extends through the casing and is coupled to the casing at the upper end. A drilling bit is fixed to the lower end of the drill pipe and includes a plurality of retractable arms which cooperate with recesses in the mobile head to rigidly connect the drilling bit to the mobile head.

Claims

1. a mobile drilling head having a series of consecutive recesses on the inner surface thereof, each of said consecutive recesses having a first vertical edge, an inclined ramp extending upwardly from the first vertical edge, and a second vertical edge opposing the first vertical edge and extending upwardly to the top of the inclined ramp of the adjacent recess;

2. Apparatus as claimed in claim 1, wherein the castellated member is rigidly attached to a means for locking the castellated member on the grooved rod.

3. Drilling apparatus comprising:

a. a mobile drilling head having bearing recesses in its inner wall;

b. an immobile casing extending upwardly from said mobile drilling head;

c. a drilling bit;

d. a pipe string rigidly connected to said drilling bit and extending upwardly through said immobile casing e. means for coupling the upper portion of said immobile casing to said pipe string;

f. a plurality of retractable arms mounted on said drilling bit in a position to cooperate with corresponding bearing recesses in said mobile drilling head to rigidly connect said mobile drilling head to said drilling bit.

4. Drilling apparatus as recited in claim 3 comprising a. an annular member rigidly connected to said mobile drilling head and extending for a short distance upwardly therefrom around said casing;

b. a first ball bearing mounted in a first sealing positioned between said casing and said mobile drilling head;

c. a second ball bearing mounted in a second sealing positioned between said casing and said annular member; and

d. means of fluid communication connecting said first and second sealings.

5. means for coupling the upper portion of said immobile casing to said pipe string, said means for coupling the upper portion of said immobile casing to said pipe string comprise:

a. an annular assembly surrounding said casing and b. a vertical adjustment means comprising i. a threaded pipe;

ii. means for integrally connecting said threaded pipe to the upper end of said pipe string;

iii. a castellated member supported by said threaded pipe; and

iv. a threaded member which is threaded on said threaded pipe, attached to said castellated member, and attached to said annular assembly.

6. Drilling apparatus as recited in claim 3 wherein said means for coupling the upper portion of said immobile casing to said pipe string comprise:

a. an annular assembly surrounding saiD casing and b. a vertical adjustment means comprising i. a threaded pipe;

ii. means for integrally connecting said threaded pipe to the upper end said pipe string;

iii. a castellated member supported by said threaded pipe; and

iv. a threaded member which is threaded on said threaded pipe, attached to said castellated member, and attached to said annular assembly.

7. Drilling apparatus as recited in claim 6 wherein said threaded pipe has longitudinal grooves to receive the castellations on said castellated member.

8. Drilling apparatus as recited in claim 6 wherein said threaded member is attached to said castellated member by means of bolts.

9. Drilling apparatus comprising:

10. Drilling apparatus as recited in claim 9 and further comprising:

a. an annular member rigidly connected to said mobile driling head and extending for a short distance upwardly therefrom around said casing;

b. a first ball bearing mounted in a first sealing positioned between said casing and said mobile drilling head;

c. a second ball bearing mounted in a second sealing positioned between said casing and said annular member; and

d. means of fluid communication connecting said first and second sealings.

11. Drilling apparatus as recited in claim 9 wherein said threaded pipe has longitudinal grooves to receive the castellations on said castellated member.

12. Drilling apparatus as recited in claim 9 wherein said threaded member is attached to said castellated member by means of bolts.

13. Drilling apparatus as recited in claim 9 wherein said casing has at least one recess on the upper outer portion thereof for the attachment of a base plate.