Unlock instant, AI-driven research and patent intelligence for your innovation.

Reverse circulation drilling system with bit locked underreamer arms

A technology of impact hammer and drill bit, which can be used in drill bits, earth-moving drilling, drilling equipment, etc., and can solve problems such as waste

Inactive Publication Date: 2006-07-12
阿迪斯 L 霍尔特
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Underreaming operations can also be accomplished by utilizing crown or ring bits, but parts of these bits must remain in the underreaming area after drilling is complete, which is wasteful and therefore in some unacceptable in drilling operations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reverse circulation drilling system with bit locked underreamer arms
  • Reverse circulation drilling system with bit locked underreamer arms
  • Reverse circulation drilling system with bit locked underreamer arms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] refer to figure 1 , a reverse circulation drilling system denoted by reference numeral 10, including a pressure head device 11, a double-wall pipe device 12 and a downhole pneumatic hammer 13 located in a drilling casing 14. refer to figure 2 with 3, The pressure head device 11 includes a casing pusher 15 and a power pressure head device 16 . Wherein, the casing pusher 15 is used to push the drilling casing 14 downward when the drill bit advances, and the power pressure head device 16 is a standard type, which is used to push the drilling casing 14 downward when the drilling casing 14 moves downward. The drilling casing 14 is rotated. Casing pusher 15 includes an annular hammer 17 that reciprocates vertically as compressed air alternately enters the chamber above and below the annular hammer 17 . Ring hammer 17 strikes anvil 18 which in turn strikes sleeve cap 19 . Casing cap 19 is sealed to the inner surface of drilling casing 14 such that drilling casing 14 can ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An underreamer drill bit assembly including a pilot bit (82) and extendable underreaming arms (88) operatively connected to the pilot bit (82). The underreaming arms (88) have an extended position for underreaming, and a retracted position in which the overall diameter of the underreamer drill bit assembly is less than the inside diameter of the well casing, permitting the entire bit assembly to be withdrawn through the well casing. In another aspect of the invention, the bit assembly is operatively connected to a dual wall pipe assembly (12). A supply of compressed air is conducted through the annulus (24) of the dual wall pipe assembly (12) to a down hole pneumatic hammer (13). Exhaust air from the down hole hammer (13) is directed to the bit assembly for continuous removal of drilling debris through a central evacuation tube (43) of the dual wall pipe assembly.

Description

technical field [0001] The invention relates to formation drilling equipment, in particular to a downhole pneumatic impact hammer drilling system. As noted in the applicant's co-pending related applications 08 / 674123 (filed July 1, 1996) and 08 / 790066 (filed August 27, 1997), the Reamers are used to create a radially enlarged area around the pilot bit for insertion of a casing. This application is a continuation-in-part of the above two applications. Background technique [0002] Eccentrically mounted underreamers are known in the art. This eccentrically mounted casing underreamer includes an arm that runs along a certain trajectory to perform casing underreaming operations, and in order to extract the drilling tool, the arm can move toward the Borehole axis retracted. However, an eccentrically mounted underreamer may deviate from the borehole axis if the underreamer encounters rock fragments, buried metal objects, etc. In most drilling operations (especially when multi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B10/66E21B10/32
CPCE21B10/327E21B10/66
Inventor 阿迪斯·L·霍尔特
Owner 阿迪斯 L 霍尔特