Specifications

The Patent Office Journal 17/12/2010
4592
(12) PATENT APPLICATION PUBLICATION (21) Application No.4020/CHENP/2010 A
(19) INDIA
(22) Date of filing of Application :29/06/2010 (43) Publication Date : 17/12/2010
(54) Title of the invention : METHOD AND APPARATUS FOR PROGRAMMABLE PRESSURE DRILLING AND
PROGRAMMABLE GRADIENT DRILLING, AND COMPLETION
(51) International classification :E21B21/00
(31) Priority Document No :11/968,010
(32) Priority Date :31/12/2007
(33) Name of priority country :U.S.A.
(86) International Application No
Filing Date
:PCT/US08/088427
:29/12/2008
(87) International Publication No
:WO 2009/088825
A3
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
(62) Divisional to Application Number
Filing Date
:NA
:NA
(71)Name of Applicant :
1)PRAD RESEARCH AND DEVELOPMENT LIMITED
Address of Applicant :P.O.BOX 71,CRAIGMUIR
CHAMBERS, ROAD TOWN, TORTOLA British Virginia
(72)Name of Inventor :
1)DOWNTON, GEOFFREY,C.
2)KHAN, WAQAR
(57) Abstract :
A method for creating a programmable pressure zone adjacent a drill bit bottom hole assembly by sealing near a drilling assembly,
adjusting the pressure to approximately or slightly below the pore pressure of the well bore face to permit flow out of the format, and,
while drilling, adjusting by pumping out of, or choking fluid flow into, the drilling assembly between the programmable pressure zone
and the well bore annulus to avoid overpressuring the programmable pressure zone unless required to control the well.
No. of Pages : 68 No. of Claims : 32