Method and apparatus for casing and directional drilling using bi-centered bit

Inactive Publication Date: 2005-06-23
SCHLUMBERGER TECH CORP
View PDF39 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030] Another embodiment of the present invention provides a method to install a casing string into a borehole while drilling. The method comprises attaching a drilling assembly to a distal end of the casing string. The drilling assembly is releasably attached to the casing string by a casing latch having a pass-through diameter smaller than an inner diameter of the casing string. The method further comprising connecting a bi-centered cutter assembly to a distal end of the drilling assemb

Problems solved by technology

This process is very time consuming and costly.
Additionally, other problems are often encountered when tripping the drill string.
These problems require additional time and expense to correct.
Often the drill bit will veer off of an planned drilling trajectory because of the unpredictable nature of the formations being penetrated or the varying forces that the drill bit experiences.

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
  • Method and apparatus for casing and directional drilling using bi-centered bit
  • Method and apparatus for casing and directional drilling using bi-centered bit
  • Method and apparatus for casing and directional drilling using bi-centered bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] In some embodiments, the invention relates to the use of a bi-centered bit in a directional casing drilling system. In some other embodiments, the invention relates to the use of a bi-centered bit in a rotary steerable casing drilling system. In yet other embodiments, the invention relates to the use of bi-centered bits in a rotary steerable system (RSS).

[0044] It should be noted that although specific embodiments refer to casing drilling, the teachings of the present invention are equally applicable to drilling while lining. A “liner” is a casing string that does not extend to the top of a well. A liner is typically used when a well is drilled, cased, and then drilled again to deepen the well. The part of the well that is drilled past the initial casing string is cased with “liner.” In practice, the only difference between casing and liner is that the liner has a smaller diameter, and it is suspended from the bottom of the casing string above it. The difference between line...

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

In one aspect, the present invention provides an apparatus to drill a borehole with a casing string. The casing string has affixed thereto a directional drilling assembly and a bi-centered cutter assembly. The bi-centered cutter assembly has a first cutting surface and a second cutting surface that are spaced apart by an offset. The bi-centered cutter assembly is configured to drill the borehole at a gauge diameter.

Description

BACKGROUND OF INVENTION [0001] Wells are generally drilled into the ground to recover natural deposits of hydrocarbons and other desirable materials trapped in geological formations in the Earth's crust. A well is typically drilled using a drill bit attached to the lower end of a “drill string.” The drill string is a long string of sections of drill pipe that are connected together end-to-end. Drilling fluid, or mud, is typically pumped down through the drill string to the drill bit. The drilling fluid lubricates and cools the drill bit, and it carries drill cuttings back to the surface in the annulus between the drill string and the borehole wall. [0002] In conventional drilling, a well is drilled to a selected depth, and then the wellbore is typically lined with a larger-diameter pipe, usually called casing. Casing typically consists of casing sections connected end-to-end, similar to the way drill pipe is connected. To accomplish this, the drill string and the drill bit are remov...

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): E21B7/06E21B7/20E21B10/26
CPCE21B7/06E21B10/26E21B7/20E21B10/265
InventorMORIARTY, KEITH ALAN
OwnerSCHLUMBERGER TECH CORP