There is disclosed herein a well screen assembly, comprising: a well treatment substance secured to the well screen assembly; and at least one reactive component of a well treatment stimulant, the at least one reactive component being secured to the well screen assembly, wherein the well treatment stimulant generates gas or heat when multiple reactive components of the well treatment stimulant react with each other. There are also disclosed related methods of treating a well.

Methods are disclosed for improved sand control, fines control, load recovery and well productivity, where the compositions comprise reaction products of an amine and a phosphate-containing compound.

Downhole apparatus for location in a bore which intersects a fluid-producing formation comprises a bore wall-supporting member configurable to provide and maintain a bore wall supporting force for a fluid-producing formation of at least 2 MPa, whereby fluid may flow from the formation into the bore. The bore wall supporting force may be utilised to modify or maintain the permeability of the rock adjacent the bore wall.

Downhole apparatus comprises a base pipe and a plurality of non-concentric pressure deformable chambers mounted externally on the pipe. The chambers may be inflated to increase the diameter of the apparatus and engage and support a surrounding bore wall.

Methods of stabilizing unconsolidated portions of a subterranean formation are provided. In one embodiment, the methods comprise: creating or enhancing at least two slots in an unconsolidated portion of a subterranean formation along a well bore, wherein the slots are positioned about 180 degrees from each other along the inner surface of the well bore; introducing a consolidating agent into the slots in the unconsolidated portion of the subterranean formation; and creating or enhancing at least one fracture in a portion of the subterranean formation.

Downhole apparatus for location in a bore which intersects a fluid-producing formation comprises a bore wall-supporting member configurable to provide and maintain a bore wall supporting force for a fluid-producing formation of at least 2 MPa, whereby fluid may flow from the formation into the bore. The bore wall supporting force may be utilised to modify or maintain the permeability of the rock adjacent the bore wall.

Methods are disclosed for improved sand control, fines control, load recovery and well productivity, where the compositions comprise reaction products of an amine and a phosphate-containing compound.

Proppant particles coated with a tacky resin coating are suspended in a gelled liquid fracturing fluid and conveyed into formations where the resin hardens to weakly consolidate the proppant particles so that fines will stick to the proppant packs.

Proppant particles coated with a tacky resin coating are suspended in a gelled liquid fracturing fluid and conveyed into formations where the resin hardens to weakly consolidate the proppant particles so that fines will stick to the proppant packs.

Apparatus for fracturing a formation or for gravel packing a borehole includes a screen assembly (12) having a plurality of screens (18) mounted on an apertured base member (14). A flow-control service assembly (27) is disposed within the bore of the screen assembly and includes an outer tubular member (26) and an inner tubular member (40). The outer tubular member includes a plurality of ports (25) that communicate with the apertures in the screen assembly. The inner tubular member and outer tubular member form an inner annulus (32), the outer tubular member and screen assembly form a medial annulus (34), and the screen assembly forms an outer annulus (30) with the wall of the borehole. Barriers (24) are placed around the ports on the outer tubular member to prevent the formation of gravel bridges across the inner annulus. The inner annulus (32) provides alternative flow paths around the ports upon the ports becoming closed to fluid flow such as by bridges.

A subterranean formation is treated with a particulate laden fluid whereby particulate flowback is reduced or prevented. The fluid comprises a mixture of a particulate, a tackifying compound and a multifunctional material, and the tackifying compound retards movement of at least a portion of the particulate within the formation upon flow of fluids from the subterranean formation. The multifunctional material subsequently reacts with said tackifying compound to consolidate at least a portion of said particulate within said formation.

An unconsolidated subterranean zone (12) penetrated by a wellbore (10) is completed by placing a slotted liner (20) in the zone, isolating the slotted liner and the wellbore in the zone, injecting a hardenable resin composition coated particulate material (27) into the zone by way of the slotted liner and then hardening the resin composition whereby the particulate material is consolidated into a hard permeable uniform mass.

An unconsolidated subterranean zone (12) penetrated by a wellbore (10) is completed by placing a slotted liner (20) having an internal sand screen (35) disposed therein in the zone, isolating the slotted liner (20) and the wellbore (10) in the zone (12) and injecting particulate material into the annuli between the sand screen and the slotted liner an the slotted liner and the wellbore to thereby form packs of particulate material therein to prevent the migration of fines and sand with produced fluids.