Boring or penetrating the earth – Processes
Reexamination Certificate
2007-10-30
2007-10-30
Suchfield, George (Department: 3676)
Boring or penetrating the earth
Processes
C166S207000, C166S277000, C166S380000, C166S384000, C175S171000, C175S317000, C175S321000, C175S322000
Reexamination Certificate
active
10496310
ABSTRACT:
A drilling assembly (2) comprises upper (4) and lower (6) drill strings with a fluid passage (80) therethrough for distributing fluid to a bottom hole assembly (10). The upper drill string (4) has an upper end (11) connectable to a drilling apparatus (13) and fluid source (16) and a lower end (18) with an attached casing expander unit (20) that communicates the fluid passage (80) of the upper (4) and lower (6) drill strings. An upper end (22) of the lower drill string (6) is formed from a casing string (24) telescoped over the casing expander unit. A constriction (31) connects the casing string (24) with the rest of the lower drill string (6). A flow restriction device (35) in the lower drill string acts to control fluid flow through the fluid passage. In use, the flow restriction device creates a pressure in the fluid passage that acts at the constriction to advance the lower drill string past the upper drill string while simultaneously expanding the portion of the casing string moving past the expander unit.
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“Adjustable Gauge Stabilizer (AGS TM) Operations Manual”, Sperry-Sun Drilling Services, undated, 62 pages.
Hay Richard T.
Keen, Jr. Jerry Lavelle
Kent Gerald Edward
Reid Charles M.
Emery Jamieson LLP
Halliburton Energy Service,s Inc.
Kuharchuk Terrence N.
Shull William
Suchfield George
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