Abstract: An expansion mandrel includes a lubrication system for lubricating the trailing edge portion of the interface between the expansion mandrel and a tubular member during the radial expansion of the tubular member.

Abstract: An apparatus and method for repairing a wellbore casing (100). An opening (115) in a wellbore casing (100) is located using a logging tool (310). An expandable tubular member (370) is then positioned in opposition to the opening (115) in the wellbore casing (100). The expandable tubular member (370) is then radially expanded into intimate contact with the wellbore casing (100).

Abstract: An expansion mandrel includes a lubrication system for lubricating the trailing edge portion of the interface between the expansion mandrel and a tubular member during the radial expansion of the tubular member.

Abstract: An expansion mandrel includes a lubrication system for lubricating the trailing edge portion of the interface between the expansion mandrel and a tubular member during the radial expansion of the tubular member.

Abstract: There is provided a method for insulating a wellbore comprising providing a wellbore, providing a casing within the wellbore, wherein an annulus is formed between the wellbore and the casing, filling the annulus with an emulsion of liquid sodium silicate and an acid forming agent, increasing a temperature in the annulus, and forming a silica gel in the annulus, the silica gel effective in insulating the wellbore. A steam injection tubing may be provided within the casing, wherein a second annulus is formed between the casing and the steam injection tubing and the second annulus is filled with the emulsion.

Abstract: An aqueous displacement fluid composition is used as a spacer fluid composition to change one type of drilling mud for another type of drilling mud or in cementing operations downhole, to clean downhole hardware in wellbores. The method comprises introducing into a wellbore an aqueous displacement fluid composition, such as a spacer fluid, to displace downhole wellbore fluids, having an improved rate of emulsification and a high capacity for emulsifying hydrocarbons, and aqueous fluid compositions. The aqueous displacement fluid composition introduced into wellbores contain mixtures of:a) water;b) a polyoxyalkylene monool surfactant represented by the formula: ##STR1## wherein R.sub.1 is a hydrocarbyl group, R.sub.2 is a C.sub.1 -C.sub.3 alkyl group, and the weight average of w+x is at least about 5; andc) a polyoxyalkylene monool surfactant represented by the formula: ##STR2## wherein R.sub.1 is a hydrocarbyl group, R.sub.2 is a C.sub.1 -C.sub.

Abstract: Well drilling, workover and completion fluids containing various water soluble condensation products of phenolic materials, formaldehyde and sulfite salts. Such condensation products may be further modified by including during the condensation reaction one or more of urea, melamine, salicylic acid, benzoic acid, phthalic acid, adipic acid, succinic acid, glutaric acid, maleic acid or the anhydrides of said acids. The drilling, workover or completion fluids may also contain clay-dispersants.