REMEDIATION TREATMENT OF SUSTAINED CASING PRESSURES (SCP) IN WELLS WITH TOP DOWN SURFACE INJECTION OF FLUIDS AND ADDITIVES

WIPO Patent Application WO2004038164

A3

A method of injection of a higher density fluid into the top of the annulus of a well while lower density fluid is withdrawn from the top of the annulus of the well, wherein the higher density fluid has a composition such that it will drop through the lower density fluid without dispersing therein, thus flowing into the deeper reaches of the annulus and not short circuiting through the top of the annulus to the point from which the lower density fluid is intended to be withdrawn. A method of injection of a higher density fluid into the top of the annulus of a well without simultaneously withdrawing a lower density fluid from the top of the annulus of the well, wherein the higher density fluid has a composition such that it will drop through the lower density fluid without dispersing therein, thus flowing into the deeper reaches of the annulus so that when the pressure induced in the annulus as a result of this injection is subsequently bled off, principally the lower density fluid will be that which is withdrawn.

WO/1987/005939	FAMILY OF XANTHAN-BASED POLYSACCHARIDE POLYMERS INCLUDING NON-ACETYLATED AND/OR NON-PYRUVYLATED GUM AND ACETYLATED OR NON-ACETYLATED POLYTETRAMER GUM
WO/1995/033914	DELAYED ACID FOR GEL BREAKING
WO/2016/131762	SHALE INHIBITORS BASED ON CATIONIC TAMARIND GUM, AND DRILLING FLUID COMPRISING THE SHALE INHIBITOR

POWELL JOHN W
FOXENBURG WILLIAM E
KIPPIE DAVID
HORTON ROBERT

PCT/US2003/028568

July 08, 2004

September 12, 2003

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MI LLC (US)

C09K8/08; C09K8/12; C09K8/575; E21B43/00; (IPC1-7): E21B43/25; C09K7/02

GB2116230A

1983-09-21

BOURGOYNE A ET AL: "Sustained Casing Pressure in Offshore Producing Wells", ANNUAL OFFSHORE TECHNOLOGY CONFERENCE, XX, XX, no. 11029, 3 May 1999 (1999-05-03), pages 1 - 13, XP002140070
DATABASE WPI Section Ch Week 198625, Derwent World Patents Index; Class A97, AN 1983-766014, XP002280069
CARPENTER R B ET AL: "ALLOY ANNULAR PLUGS EFFECTIVE FOR CASING ANNULAR GAS FLOW REMEDIATION SUSTAINED CASING PRESSURE POTENTIAL THREAT", OFFSHORE, PETROLEUM PUBLISHING CO. TULSA, US, vol. 62, no. 3, March 2002 (2002-03-01), pages 72 - 73,109, XP001116571, ISSN: 0030-0608

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