▎ 摘　　要

NOVELTY - A well fluid comprises a resin component, a curing agent and a nanocomposite filler, and is stable at a temperature of 550° F or more and a pressure of 10000-15000 psi. USE - Well fluid is used for zone isolation, subterranean/geothermal well system for carrying out well operation in subterranean well having downhole supercritical temperature zone, lost circulation well fluid for geothermal well system for reducing lost circulation from lost circulation zone at supercritical temperature within geothermal wellbore, casing thread well fluid for sealing casing threads of pipe string, located in supercritical zone of geothermal wellbore, gas migration well fluid for treating gas migration within geothermal wellbore having supercritical temperature gas migration zone, kickoff plug well fluid for setting kickoff plug in geothermal wellbore, packer leak well fluid for treating packer leaks, plug and abandon well fluid for plugged and abandoned geothermal well system for plugging and abandoning geothermal well, primary cementing well fluid for primary cementing, water shut off well fluid for shut off method for geothermal well, treating supercritical conformance zone, and performing well kill operation (all claimed). ADVANTAGE - The high-temperature well fluid has desired rheological property including viscosity and pumpability, and thermal stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: method (M1) for zone isolation, which involves providing the well fluid into a supercritical temperature section of pipeline and curing to form a compressible zonal isolation structure. The supercritical temperature section is at a temperature of 550° F or more; method (M2) for carrying out well operation in a subterranean well having a downhole supercritical temperature zone, which involves providing the well fluid to the downhole zone; a subterranean/geothermal well system, which comprises the well fluid within supercritical subterranean zone; method (M3) for reducing lost circulation from a lost circulation zone at supercritical temperature within a geothermal wellbore, which involves providing a lost circulation well fluid as the well fluid to the lost circulation zone, curing to form a plug that seals off the lost circulation zone, and drilling through the plug to extend the wellbore through the lost circulation zone; the lost circulation well fluid; a geothermal well system, which comprises a geothermal wellbore, supercritical temperature lost circulation zone within the geothermal wellbore, and a lost circulation plug comprising the cured lost circulation well fluid. The lost circulation plug is configured to seal off the supercritical temperature lost circulation zone and to define a passage extending the wellbore through the lost circulation zone; method (M4) for sealing casing threads of a pipe string, where the threads are located in supercritical zone of geothermal wellbore, which involves providing a casing thread well fluid as the well fluid to the casing threads in the wellbore, applying a pressure to squeeze thread the well fluid into the casing threads, and maintaining pressure to allow the well fluid to cure and form a seal in the threads; the casing thread well fluid; method (M5) for treating gas migration within a geothermal wellbore having a supercritical temperature gas migration zone, which involves providing a gas migration well fluid as the well fluid to the gas migration zone, and maintaining positive pressure on the gas migration well fluid until the gas migration well fluid cures and hardens; the gas migration well fluid; method (M6) for setting a kickoff plug in the geothermal wellbore, which involves lowering an open ended tubular component into the geothermal wellbore, providing a kickoff plug well fluid comprising the resin component, curing agent and nanocomposite filler through the open ended tubular component and into a supercritical temperature kickoff zone of the wellbore, and curing the kickoff plug well fluid into a hardened kickoff plug; the kickoff plug well fluid; method (M7) for treating packer leaks from a packer, which involves loading a packer leak well fluid into an annulus of a geothermal well, chasing the packer leak well fluid comprising the resin component, curing agent and nanocomposite filler with a liquid, shutting in the well, allowing the packer leak well fluid to fall through the annulus and settle on top of leaking areas of the packer, and curing the packer leak well fluid to form a seal on top of the leaking areas of the packer; the packer leak well fluid; method (M8) for plugging and abandoning geothermal well, which involves providing a plugging well fluid comprising the resin component, curing agent and nanocomposite filler in supercritical temperature zone of the geothermal well, curing the plugging well fluid to form a plug that seals off the geothermal well, and abandoning the geothermal well; the plug and abandon well fluid; a plugged and abandoned geothermal well system, which comprises wellbore in supercritical temperature zone of geothermal well, and plug configured in the supercritical temperature zone; method (M9) for primary cementing, which involves providing a primary cementing well fluid comprising the resin component, curing agent and nanocomposite filler to a supercritical temperature zone of an annulus, where the annulus is between a casing positioned in the wellbore and the wellbore, and curing the primary cementing well fluid to form a sheath around the casing to fix the casing in the wellbore; the primary cementing well fluid; water shut off method (M10) for geothermal well, which involves providing a well shut off well fluid comprising the resin component, curing agent and nanocomposite filler to a target zone in the geothermal well outside of a casing positioned in the geothermal well, penetrating a subterranean area of the geothermal well in a radial zone extending radially outside of the casing, and curing the well shut off well fluid to form cured and hardened well shut off well fluid. At least one of the target zone or the radial zone is at a supercritical temperature; the water shut off well fluid; method (M11) for treating supercritical conformance zone, which involves detecting a problem area in the supercritical conformance zone, providing a well fluid to the problem area in the supercritical conformance zone and curing the well fluid to form a cured and hardened plug of the well fluid; and method (M12) for performing a well kill operation, which involves providing the well fluid to a target area, performing circulation step (s1), and performing circulation step (s2).