Drilling method

Details Drilling method Drilling method

2004-07-19

2008-10-07

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Processes

Boring with specific fluid

C166S283000, C507S140000

Reexamination Certificate

active

07431106

ABSTRACT:
A method of reducing formation breakdown during the drilling of a wellbore which method comprises: (a) circulating a drilling mud in the wellbore comprising (i) an aqueous or oil based fluid, (ii) at least one fluid loss additive at a concentration effective to achieve a high temperature high pressure (HTHP) fluid loss from the drilling mud of less than 2 ml/30 minutes and (iii) a solid particulate bridging material having an average particle diameter of 25 to 2000 microns and a concentration of at least 0.5 pounds per barrel; (b) increasing the pressure in the wellbore to above the initial fracture pressure of the formation such that fractures are induced in the formation and a substantially fluid impermeable bridge comprising the solid particulate bridging material and the fluid loss additive(s) is formed at or near the mouth of the fractures thereby strengthening the formation; (c) thereafter continuing to drill the wellbore with the pressure in the wellbore maintained at above the initial fracture pressure of the formation and below the breakdown pressure of the strengthened formation.

REFERENCES:
patent: 4217965 (1980-08-01), Cremeans
patent: 4422948 (1983-12-01), Corley et al.
patent: 4608182 (1986-08-01), Dickert, Jr. et al.
patent: 4710586 (1987-12-01), Patel et al.
patent: 4957174 (1990-09-01), Whitfill et al.
patent: 5054554 (1991-10-01), Pearson
patent: 5094762 (1992-03-01), Lahalih
patent: 5180020 (1993-01-01), Fuh et al.
patent: 5207282 (1993-05-01), Fuh et al.
patent: 6100222 (2000-08-01), Vollmer et al.
patent: 6391830 (2002-05-01), Dobson, Jr. et al.
patent: 6403537 (2002-06-01), Chesser et al.
patent: 6976537 (2005-12-01), Verret
patent: 810131 (1969-04-01), None
patent: 1 074 598 (2001-02-01), None
patent: 2 120 302 (1983-11-01), None
patent: 2 351 098 (2000-12-01), None
Fuh, Giin-Fa, et al; “A New Approach to Preventing Lost Circulation While Drilling”; SPE 24599;Society of Petroleum Engineers(1992) pp. 569-582.
Aston, M., et al; “Towards Zero Fluid Loss Oil Based Muds”; SPE 77446,Society of Petroleum Engineers(2002) pp. 1-9.
Aston, M., et al; “Drilling Fluids for Wellbore Strengthening”; SPE/IADC 87130;Society of Petroleum Engineers(2004) pp. 1-9.
Kelley, S., et al; “Treatments Increase Formation Pressure Integrity in HTHP Wells”;American Associates of Drilling Engineers(2001) pp. 1-13.
Sweatman, R., et al; “Formation Pressure Integrity Treatments Optimize Drilling and Completion of HTHP Production Hole Sections”; SPE 68946;Society of Petroleum Engineers(2001) pp. 1-13.

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