69results about How to "Low fluid viscosity" patented technology

A fluid conduit body having a semi-conductive material disposed therein and at least one wire coupling an electrical power supply to the conduit to provide an electrical current therethrough to heat the fluid conduit also has an end cover molded over a fitting fitted to an end of the conduit and over an end of the wire coupling the power supply to an end of the conduit. Alternatively, a fluid conduit heating system employs a semi-conductive sleeve disposed over a fluid conduit with the sleeve extending at least partially over a fitting fitted to an end of the conduit. An electrical power supply is coupled to each end of the sleeve to provide an electrical current through the semi-conductive sleeve to heat the sleeve and the fluid conduit. An end cover is molded over at least a portion of the fitting and the sleeve extending thereover.

The invention relates to a method combining coiled tubing with supercritical CO2 for jet-flow sand washing plugging removal. The method uses the supercritical CO2 as flushing fluid to carry out jet-flow sand washing plugging removal for a shaft or an oil casing. When a supercritical CO2 jet-flow is combined with the coiled tubing to carry out supercritical CO2 jet-flow sand washing plugging removal, pressure relief is not needed in the trip process, the coiled tubing can directly work with pressure, and the working procedure and the time are saved. The fluid viscosity of the supercritical CO2 is low, the surface tension of the supercritical CO2 is close to zero, and the diffusion coefficient of the supercritical CO2 is large, so that the supercritical CO2 can easily enter into tiny pores and cracks to dissolve polymer organic matters and other impurities, and the cleaning is more thorough. And, above all, the supercritical CO2 does not have any pollution to a reservoir, the viscosity of crude oil can also be reduced after the supercritical CO2 enters into the reservoir, the permeability of the reservoir is increased, and the yield and the recovery ratio are increased. Thus, the supercritical CO2 is especially suitable for downhole plugging removal working of unconventional oil-gas reservoirs such as low permeability oil-gas reservoirs, pressure-depleted oil-gas reservoirs, coal gas reservoirs, shale gas reservoirs, tight sandstone gas reservoirs, heavy oil reservoirs and the like.

A device-cooling base oil includes 30 mass % of at least one of an oleyl ester (e.g., oleate and oleyl alcohol ester) and oleyl ether. The oleyl ester and the oleyl ether each have 23 or more of a total number of a terminal methyl group, a methylene group and an ether group in a main chain and 1 or less of a total number of a methyl branch and an ethyl branch. The base oil has a kinematic viscosity at 40 degrees C. in a range of 4 mm2 / s to 30 mm2 / s. A device-cooling oil provided by blending the base oil is excellent in electrical insulation properties and thermal conductivity, and thus is favorably usable for cooling a motor, a battery, an inverter, an engine, an electric cell or the like in an electric vehicle, a hybrid vehicle or the like.

Subterranean formations, such as tight gas formations, may be subjected to hydraulic fracturing by introducing into the formation a fracturing fluid of an aqueous fluid, a hydratable polymer, a crosslinking agent and proppant. The fracturing fluid is prepared in a blender and then pumped from the blender into the wellbore which penetrates the formation. The fluid enters the reservoir through an entrance site. The apparent viscosity of the fluid decreases distally from the entrance site such that at least one of the following conditions prevails at in situ conditions:(a) the apparent viscosity of the fracturing fluid 100 feet from the entrance site is less than 10 percent of the apparent viscosity of the fracturing fluid at the entrance site;(b) the apparent viscosity of the fracturing fluid 15 minutes after introduction into the entrance site is less than 15% of the apparent viscosity of the fracturing fluid at the entrance site; or(c) the apparent viscosity of the fracturing fluid is less than 10 cP within 15 minutes after being introduced through the entrance site.