US 2015/0083423 A1Published application

Method for improving isolation of flow to completed perforated intervals

AssigneeBaker Hughes Incorporated

InventorsHarold Dean Brannon, Harold Gene Hudson, Scott Gregory Nelson, D.V. Satyanarayana Gupta

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Abstract

A method for building a plug in a horizontal wellbore using a fluid pill containing a suspended well treatment composite. The well treatment composite contains a core comprising at least one deformable particulate and at least one dissolvable diverter. At least a portion of the surface of the core is coated with at least one viscosifying polymer and at least one crosslinking agent. The fluid pill is pumped into the wellbore at the end of a fracturing treatment and the fluid pill may be displaced by a displacement fluid. The fluid pill may be diverted to an area of lower permeability by disassociating the dissolvable diverter from the core. The disassociated diverter blocks an area of higher permeability. The sized particle distribution of the diverter is sufficient to at least partially block the penetration of fluid into the high permeability zone. In the lower permeability zone, a thickened gel is formed by the in-situ reaction of the viscosifying polymer and crosslinking. Deformable particulates in the gelled fluid form a bridge plug.

Claims25

Dependent claims

A method of building a plug in a horizontal wellbore which penetrates a subterranean formation, the method comprising:

(a) pumping a fluid pill into the wellbore wherein the fluid pill comprises a suspended well treatment composite, the well treatment composite comprising a core having a dissolvable diverter and a deformable particulate, a viscosifying agent and a crosslinking agent, wherein the viscosifying agent and crosslinking agent are coated onto the core;
(b) disassociating at least a portion of the dissolvable diverter from the core of the well treatment composite and rendering a modified fluid pill comprising the deformable particulate and viscosifying polymer and crosslinking agent coated onto the deformable particulate;
(c) blocking at least a portion of a high permeability zone of a subterranean formation with the disassociated dissolvable diverter;
(d) diverting the flow of the modified fluid pill from a high permeability zone to a lower permeability zone of a subterranean formation;
(e) allowing at least one fracture in the lower permeability zone of the subterranean formation to partially close;
(f) at least partially preventing the deformable particulate from entering the at least one fracture by forming a thickened gel containing the deformable particulate, wherein the thickened gel is formed by the in-situ reaction of:
(i) the crosslinking agent disassociated from the core;
and
(ii) viscosifying polymer disassociated from the core;
and
(g) forming a fluid-impermeable plug with the thickened gel containing the deformable particulate.

8 more elements

A method of building a plug in a horizontal wellbore, the method comprising:

(a) pumping a fracturing fluid into the horizontal wellbore at a pressure sufficient to create or enlarge a fracture in the subterranean formation penetrated by the wellbore;
(b) pumping into the wellbore a fluid pill having a well treatment composite suspended therein, the well treatment composite comprising a solid core comprising a dissolvable diverter and a deformable particulate and a viscosifying polymer and crosslinking agent coated onto the core;
(c) pumping a displacement fluid down the wellbore and displacing the fluid pill further into the wellbore in proximity to a perforation tunnel in a desired location;
(d) flowing the fluid pill into a high permeability zone, blocking at least a portion of the higher permeability zone with the dissolvable diverter, forming a modified fluid pill and flowing the modified fluid pill into a lower permeability zone of the formation, wherein the modified well treatment composite has a core comprising the deformable particulate and viscosifying polymer and crosslinking agent coated onto the deformable particulate;
(e) allowing at least one fracture within the horizontal wellbore to at least partially close, the modified well treatment composite remaining suspended within the modified fluid pill;
(f) pumping the displacement fluid down the horizontal wellbore to slowly displace the modified fluid pill;
(g) increasing the viscosity of the modified fluid pill to form a gelled fluid by the in-situ reaction of:
(i) the crosslinking agent as it is disassociated from the deformable core;
and
(ii) viscosifying polymer disassociated from the deformable core;
and
(h) at least partially preventing the gelled fluid containing the deformable particulate from entering the at least one fracture in the zone, wherein the gelled fluid forms a fluid-impermeable plug within the wellbore.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/556,883Filed 1 Dec 2014
Priority: 22 Nov 2011
Published: 26 Mar 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

C09K 8/805
Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open: coated proppants
C09K 8/512
Macromolecular compounds: containing cross-linking agents
C09K 8/516
Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls: characterised by their form or by the…
C09K 8/62
Compositions for stimulating production by acting on the underground formation: compositions for forming crevices or fractures

Family

Application13/302,722Continuation in part · filed 22 Nov 2011
Application61/664,640Us provisional application · filed 26 Jun 2012
Application13/928,006Continuation in part · filed 26 Jun 2013
Application14/461,123Continuation in part · filed 15 Aug 2014
Application14/512,232Continuation in part · filed 10 Oct 2014
Application14/556,883Continuation in part
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From the US filing history. Foreign family members aren’t listed.

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