Three pumpable geopolymer compositions for well sealing application is disclosed herein. One pumpable geopolymer composition comprises: (i) less reactive aluminosilicate; (ii) more reactive aluminosilicate; (iii) alkaline silicate activator solution with a very low SiO.sub.2/M.sub.2O. Another pumpable geopolymer composition comprises: (i) less reactive aluminosilicate; (ii) more reactive aluminosilicate; (iii) alkaline silicate-free activator solution that may contain an alkali salt; and (iv) powdered alkali silicate glass. The third pumpable geopolymer composition comprises (i) less reactive aluminosilicate; (ii) more reactive aluminosilicate; (iii) alkaline low silicate activator solution; and (iv) powdered alkali silicate glass.

A composition including a coated nanoparticle and an ion, wherein the coated nanoparticle includes a nanoparticle, a linker, and a stabilizing group; methods of making and using the composition; and systems including the composition. The linker includes an anchoring group, a spacer, and a terminal group. The anchoring group is covalently bound to the nanoparticle and at least one of the terminal groups is covalently bound to at least one stabilizing group. A composition including a crosslinked-coated nanoparticle and an ion, wherein the crosslinked-coated nanoparticle includes a nanoparticle and a coating that includes a linker, a crosslinker, and a stabilizing group; methods of making and using the composition; and systems including the composition.

This invention relates to methods for servicing subterranean wells, in particular, fluid compositions and methods for remedial operations during which the fluid compositions are pumped into a wellbore and make contact with well cements placed during primary cementing or previous remedial cementing operations.

Lipophilic fibers are effective media for cleaning non-aqueous fluids out of a subterranean wellbore. The fibers are preferably added to a drilling fluid, a spacer fluid, a chemical wash, a cement slurry or combinations thereof. Non-aqueous fluids, such as an oil-base mud or a water-in-oil emulsion mud, are attracted to the fibers as they circulate in the wellbore.

A wellbore fluid comprising a first aqueous base fluid and a plurality of silica nanoparticles suspended in the first aqueous base fluid. The nanoparticles are present in the fluid in an amount to have an effect of decreasing a crystallization temperature by at least 4 to 55° F. as compared to a second aqueous base fluid without the silica nanoparticles.

A method of controlling the equivalent circulating density of an epoxy resin, used to cement a wellbore, is provided. The method includes adjusting the cross sectional area of the annulus exit using a valve or other mechanism to increase or decrease the equivalent circulating density of the epoxy resin.

A method of controlling the equivalent circulating density of an epoxy resin, used to cement a wellbore, is provided. The method includes adjusting the cross sectional area of the annulus exit using a valve or other mechanism to increase or decrease the equivalent circulating density of the epoxy resin.

A method of increasing the density of a saturated or near saturated salt (initial) brine, such as a monovalent or divalent salt solution, consists of first lowering the true crystallization temperature (TCT) of the saturated or near saturated salt brine to the eutectic point using a glycol and then adding dry salt to the brine of lower TCT to provide a brine of increased density. The TCT may be lowered by the addition of glycol to the saturated or near saturated salt brine. The dry salt is the same salt as the salt of the saturated or near saturated salt brine. The amount of dry salt added to the brine of lower TCT is an amount sufficient to render a saturated or near saturated brine. The density of the resulting brine is higher than the density of the saturated or near saturated salt (initial) brine.

A method of increasing the density of a saturated or near saturated salt (initial) brine, such as a monovalent or divalent salt solution, consists of first lowering the true crystallization temperature (TCT) of the saturated or near saturated salt brine to the eutectic point using a glycol and then adding dry salt to the brine of lower TCT to provide a brine of increased density. The TCT may be lowered by the addition of glycol to the saturated or near saturated salt brine. The dry salt is the same salt as the salt of the saturated or near saturated salt brine. The amount of dry salt added to the brine of lower TCT is an amount sufficient to render a saturated or near saturated brine. The density of the resulting brine is higher than the density of the saturated or near saturated salt (initial) brine.

A vulcanized rubber and date tree based lost circulation material (LCM) is provided. The vulcanized rubber and date tree based LCM includes vulcanized rubber particles, date tree seed particles produced from date tree seeds, and date tree fibers produced from date tree waste. The LCM may include vulcanized rubber particles in the range of 20 pounds-per-barrel (ppb) to 40 ppb in the drilling fluid, date tree seed particles in the range of 50 ppb to 70 ppb in the drilling fluid, and date tree fibers in the range of 10 ppb to 40 ppb in a drilling fluid, including a first size of fibers in the range of 5 ppb to 20 ppb, and a second size of fibers in the range of 5 ppb to 20 ppb. Methods of lost circulation control and manufacture of the vulcanized rubber and date tree based LCM are also provided.