Abstract: A method for treating an underground reservoir, which method comprises introducing into the reservoir a treatment fluid comprising, dissolved or dispersed in water, an ester and a polymer breaker, such that the ester hydrolyses to produce an organic acid to dissolve acid soluble material present within the reservoir and the polymer breaker degrades polymeric material present within the reservoir.

Abstract: A security barrier which includes an elongated body having a top side and a bottom side and having a top portion having a first width and a bottom portion having a second width that is greater than the first width. The top side defines a channel. Also, a security barrier is provided in which at least a portion of the anchoring opening extends through the top portion and bottom portion. Additionally, a security barrier is provided in which the anchoring opening has a first anchoring opening end which communicates with the bottom side of the elongated body and a second anchoring opening end which communicates with the top side. A method is also provided for providing anchoring the security barrier.

Abstract: A method for treating an underground reservoir, which method comprises introducing into the reservoir a treatment fluid comprising, dissolved or dispersed in water, an ester and a non-enzyme catalyst capable of increasing the rate of hydrolysis of the ester, such that the ester hydrolyses to produce an organic acid to dissolve acid soluble material present within the reservoir.

Abstract: A method of precipitating or depositing material within an underground reservoir which comprises introducing into the reservoir in aqueous solution (i) an isolated enzyme and (ii) a substrate for the enzyme, such that the action of the enzyme on the substrate leads to the precipitation or deposition of material within the underground reservoir.

Abstract: Apparatus for mounting screens, such as curtains, comprises a support member suspended from a mounting member. The support member is movable from an in-use position, where a screen hanging from the support member is positioned in its normal in-use location, to a maintenance position in which the support member, and the means for attaching the screen to the support member, are easily accessible.