A self-contained portable unit for steam generation and injection by means of an injector wellhead hanger of coiled jacketed capillary tubing with a closed circuit and procedure for operation in oil wells comprises a portable, self-contained equipment for injection and dewaxing of heated fluids mounted on a hauler that includes a heat exchanger, a water tank, a heat exchanger, a softener, a centrifugal pum, a lubricant tank, a power engine, an electrical power generator, a control cabin, a fluids softener, a steam boiler, a reservoir tank, a fuel tank, a hose reel and one hose set for two lines of fluid injection and return of that connect to a wellhead hanger/injector for two capillaries making up a closed circuit. This wellhead includes three module and crowned with a lid, two of which are hangers and the rest are injection-type.

A passive apparatus and method for isolating flow within a thermal wellbore wherein inflow apertures are plugged with a temporary fusible alloy plug that can be selectively removed by increasing the wellbore temperature.

A themo-chemical system for removing organic deposits such as wax, asphaltenes, and resins in an oil well borehole, and in oil production and transportation tubing and pathways.

A fracturing apparatus, comprising: a plurality of portions to be heated; a heating system for heating each of the portions to be heated; and an auxiliary power unit, which is configured to at least provide power for a heating operation by the heating system. When the fracturing apparatus operates in a cold area, each of the portions to be heated can be heated by the heating system, so as to ensure the normal start-up and operation effect of the fracturing apparatus.

A method of downhole steam generation comprising determining a desired level of electrical conductivity for water to be converted to steam in a downhole location, acquiring a main feedwater supply, wherein water of the main feedwater supply has an electrical conductivity lower or higher than the desired level, mixing water of the main feedwater supply with water from one or more sidestreams to generate a resultant stream with an electrical conductivity of about the desired level, pumping the resultant stream to the downhole location, and passing an electrical current through the resultant stream in the downhole location to generate steam.

A method for stimulating heavy oil recovery from CHOPS wells at or nearing the end of productive life but not experiencing water-out, wherein produced water is heated to below boiling point and injected back downhole to reduce heavy oil viscosity in the near-wellbore region and surrounding the wormhole network, enabling existing reservoir pressure to drive the reduced-viscosity heavy oil toward the well for production to surface. The injection-soak-production cycle can be repeated as desired so long as adequate reservoir pressure exists.

A distributed combined cooling, heating and power energy system for gas extraction in a coal mining area, which belongs to an energy system for gas production. A gas extraction pump station, a gas storage tank, a water-sealing flame arrester, a wire mesh filter, a first pipeline flame arrester, a wet-type bleeding valve and a cyclone dehydrator are sequentially connected; an outlet of the cyclone dehydrator is divided into two branches, one branch sequentially connected with a second pipeline flame arrester, a proportioning mixer, a gas power machine, a waste heat boiler and a waste heat-type double-effect lithium bromide absorption water chiller/heater unit, and the other connected with a gas-type double-effect lithium bromide absorption water chiller/heater unit; a first power generator is connected with the gas power machine, a water storage tank outlet is connected with a pressurizing pump, a second power generator is connected with a steam turbine and driven by the steam power machine to generate power, and cold/hot water of the waste heat-type water chiller/heater unit and the gas-type water chiller/heater unit is delivered through an energy supply pipeline after collection and mixing. With the power energy system mining area, clean production and utilization of coal-mine gas and economic development of coal mine areas are realized.

A method of increasing near-wellbore rock strength so as to mitigate or remediate lost circulation events through increased hoop stress in the near-wellbore in a subsurface formation comprises a) cooling a near-wellbore region of the formation, b) allowing a lost circulation material to enter the cooled near-wellbore region; and c) heating the near-wellbore region.

A subsea riser system with a gas-lift facility has a production riser having a riser conduit and at least one lift gas injection port communicating with the riser conduit. An umbilical is arranged to supply lift gas to the lift gas injection port. A heating unit is positioned to act on a downstream end region of the umbilical adjacent to the lift gas injection port. A method of providing lift gas to a subsea riser system includes the steps of conveying lift gas toward a production riser and, before injecting the lift gas into the production riser, heating the lift gas locally adjacent to the production riser.

Systems and processes are disclosed for enhanced geothermal energy production. The enhanced closed-loop geothermal system may include a wellbore, where at least a portion of the wellbore penetrates a geothermal heat source, a closed-loop geothermal system deployed in the wellbore, and a heat-buffer including a heat-buffer material disposed within the portion of the wellbore penetrating the geothermal heat source and accumulate heat when working fluid is not circulating and release it to the closed-loop geothermal system when working fluid is circulated. The closed-loop geothermal system deployed in the wellbore, includes a downhole heat exchanger deployed within the portion of the wellbore penetrating the geothermal heat source, a bidirectional fluid conduit, wherein a first end of the bidirectional fluid conduit is fluidly connected to the downhole heat exchanger, and a heat utilization facility, wherein a second end of the bidirectional fluid conduit is fluidly connected to the heat utilization facility.