Applying at least two separate wells for the production of hydrocarbons for producing geothermal energy

 

(57) Abstract:

Is intended to generate geothermal energy. The hole in the ground for transfer of geothermal energy from the rock around the well to the fluid carrier energy, which is injected into the well. According to the invention the lower end of the at least two essentially vertically passing borehole sections, previously used for oil or gas, are interconnected by means of additional borehole section that allows you to reuse the equipment and the well and thus reduces the costs for obtaining energy. 1 Il.

The invention relates to the use of at least two separate wells for the production of hydrocarbons for producing geothermal energy.

In U.S. patent 4290266 disclosed accommodation tubular loop deep in the wellbore in the earth, the passage of fluid down into the ground through the first section of the tubular loop and its rise up from the ground through the second section of the tubular loop. The disadvantage of this method is that the section of the tubular loop are very close to each other, thereby warm liquid flowing upwards, cooled cold liquid flowing down, R is okeh boreholes or wells, which have been used or are being used for oil or gas, together with associated equipment on the surface. In the result of the impact of this equipment on the environment, due to environmental and other reasons increases the requirement for such equipment, which must be removed or dismantled and well sealed after the cessation of production of oil or gas, which is a very expensive process. The technical result of the present invention is to increase the effectiveness and efficiency of the process of obtaining geothermal energy.

This technical result is achieved by using at least two separate wells for hydrocarbon production, for producing geothermal energy, together with at least one new borehole section, cross-cutting the lower section of each of the old wells used for transporting heat transfer fluid up and down, respectively, from the new borehole section, whereby a new borehole section adapted to transport the heat transfer fluid from one well to another.

Hereinafter the invention will be described in more detail with reference to Pelagea for producing geothermal energy.

As shown in the drawing, the platform 1 is located on the seabed 5, and its upper section is located above the sea surface 6. From the seabed 5 near the platform are two essentially vertical borehole sections, namely the first borehole section 2 and the third borehole section 4, to locations 7 and 8, respectively, in the mountainous formations from which were extracted oil or gas and transported through sections 2, 4.

Instead of removing the platform and seal the borehole sections 2, 4 after the termination of the production of oil or gas, according to the invention, drilled an additional or second borehole section 3, which will connect locations 7 and 8 with each other, thus forming a downhole tubular loop that includes the first, second and third borehole sections 2, 3 and 4, respectively.

Pass the appropriate liquid, such as water, down into the first borehole section 2, this fluid may leak through the second borehole section 3, where it heats the surrounding rock, and then rises up through a third borehole section 4, while the heated fluid in the third borehole section 4 is not cooled down current flow of cold water that goes down in the first borehole, secac shown in the drawing, additional borehole section 3 can be carried out in a relatively large tubular loop at some distance from one of the locations 7 before it will stretch in the direction of the second section 8, thereby providing a heating fluid to a temperature close to the temperature of the rocks around the second borehole section 3, before the fluid flow will go up and the third borehole section 4, even if the flow rate through it is high.

This may be provided on the platform is known, essentially, hardware (not shown), thereby the heat energy can be converted to another suitable form of energy, such as electrical energy and submitted to the consumer. This equipment may include, for example, heat exchangers, turbines, generators, etc., and it is assumed that it is known to experts in this field of technology.

As will be understood, the invention enables the reuse of equipment and wells, dismantling which will entail great expense to the owner. The invention creates energy, the release of which does not pollute the environment, and which is obtained from an almost inexhaustible source.

DL the th information.

At a depth of between 3500 and 6000 m below the seabed, the temperature of the rocks is about 110-180oC.

The cost of the two boreholes, each having a length of about 3000 m, for oil and gas, currently approximately 150 million NOK. Additional rejected the well, which has a length of approximately 1000 m and which connects these two borehole, worth approximately 20 million NOK.

For example, drill site Statfjord In the North sea includes approximately forty wells, which together with the platform is likely to be closed around the end of 2003. The use of the invention, however, these wells may be part of the twenty-tubular loops for producing geothermal energy, and the platform can be used as the installation location for the above equipment.

It will be clear that in borehole sections can be entered pipelines, which may leak fluid.

To do this, the oil phase can be used in the following example:

The internal diameter of the pipe - 0,215 m

The amount of water - 700 m3per hour

The speed of the water - 5,32 m/s

what about the pump - 40oC

The temperature of the water issuing from the well - 110oC

The length of the well - 7000 m

Power pump - 1,72 MW

thermal capacity of 40 MW

According to rough calculations, this thermal power can provide an effective yield of approximately 5 MW. Twenty downhole tubular hinges on this oil section will, therefore, able to provide the entire electricity output of 100 MW deductible pump output is 20 x 1,75 MW = 34,4 MW, thus creating 65,6 MW of electricity.

Even if in the above invention, it was found that two borehole sections were interconnected with additional borehole section, it will be clear that they can be mutually connected by more than two borehole sections.

Applying at least two separate wells for the production of hydrocarbons for producing geothermal energy, together with at least one new borehole section, cross-cutting the lower section of each of the old wells that are used for transporting heat transfer fluid up and down respectively, from the new borehole section, whereby a new borehole section adapted to transport

 

Same patents:

Geothermal energy // 2145046
The invention relates to geothermal energy devices for cold climatic zones

The invention relates to systems for heat supply and water using geothermal sources at sites with two or more hydrothermal layer

The invention relates to power engineering and can be used for heating based geothermal sources

Geothermal device // 2111423
The invention relates to the field of power engineering and can be used for heating based geothermal sources

The invention relates to steam boilers, using heat from the earth's interior

FIELD: power engineering; use of geothermal heat in units using water from external sources.

SUBSTANCE: proposed plant includes vertical delivery well-bore running to earth's crust and vertical outlet well-bore located at some distance from delivery well-bore; provision is made for evacuation of vapor from this well-bore; plant is also provided with horizontal well-bore for connection of two vertical well-bores and at least one section of horizontal well-bore located in hot rock; all said well-bores are provided with casing pipes to exclude contact of liquid flowing through well-bores with soil or underground water; water obtained after condensation of vapor from outlet well-bore is pumped to delivery well-bore and is used repeatedly. Besides that, horizontal well-bore may be entirely located in rock; delivery and outlet well-bores enter hot rock; plant is provided with devices for delivery of water from delivery well-bore to horizontal well-bore. Water admitting to rock is not contaminated in such plant and may be used repeatedly.

EFFECT: enhanced efficiency.

4 cl, 2 dwg

FIELD: systems using natural heat energy for geothermal power plants or remote heating systems.

SUBSTANCE: proposed method for energy exchange between earth bodies and energy exchanger is implemented by system in which energy exchanger 2 communicates through forward-flow line 10 and return-flow line 14 of circulating water loop with heat exchanger 18 that uses earth heat energy and has at least one forward-flow heat insulated tube 20, 20a disposed in borehole 22 wherein it is enclosed by separating tube 24 that has radial return-flow region 28 on external side for circulating water wherein there is at least one return-flow tube 30 communicating with return-flow line 14; at least lower region of borehole carries porous filler 18 and communicates with bottom inlet hole 45, 46a of forward-flow tube 20, 20a at least at bottom of borehole 22 via one or more through holes 44 made in separating tube 24. Adjustable shut-off valves 12, 16 are installed on forward- and return-flow lines 10 and 14. At least one forward-flow heat-insulating tube is disposed within separating tube 24 inside borehole 22; region 28 disposed in radial direction outside tube 24 forms circulating-water return-flow region. Disposed in return-flow region 28 is at least one return-flow tube 30 communicating with return-flow line 14 and with porous filler 38, as well as with forward-flow tube 20 at least at bottom of borehole 22 through inlet hole 20 made at bottom of this tube or through inlet holes 46, 46a of forward-flow tubes 20, 20a via one or more through holes 44 made in separating tube 24. System also has device 50 connected thereto for filling it with medium to build up high pressure within system, and preferably drain cock 56 disposed in forward-flow line 10 between shutoff valve 12 and heat exchanger 18 using earth heat energy, both designed to drain circulating water from forward-flow tube 20 and to initiate water vapor generation and displacement from earth body.

EFFECT: reduced boring and operating cost, enhanced reliability.

35 cl, 9 dwg

FIELD: heat supply systems.

SUBSTANCE: method comprises supplying cooled heat-transfer agent to the casing pipe by means of the heat pump and rising the heated heat-transfer agent in the tube mounted concentrically in the casing pipe.

EFFECT: enhanced environmental protection and reduced cost.

1 cl, 1 dwg

FIELD: electrical engineering, possibly electric energy generating plants on base of liquid low-potential power source.

SUBSTANCE: electric energy generating plant includes converter of neat energy of low-potential water to kinetic energy applied to electric energy generator. Plant is mounted on draining pipeline and it has linear-structure electric energy generator. Said converter is made material with shape memory effect having transition point between temperature of low-potential water and environment and it is kinematically coupled with armature of linear- structure generator. Converter is jointly mounted with possibility of moving from low-potential water to environment and from environment to low-potential water. Environment may be in the form of water pool to which low-potential water is discharged.

EFFECT: possibility of using heat of low-potential waters with temperature 30 - 50°C discharged every day from cooling systems of waters of nuclear and heat electric power stations.

2 cl, 2 dwg

FIELD: solar power engineering.

SUBSTANCE: invention relates to heat pipe solar collectors and it can be used in heat supply of buildings. Parabolic reflectors are installed under light transparent coating of collector and over absorbing pipes which form uninterrupted corrugated panel provided with liquid lenses in lower part. Liquid lenses and arranged over absorbing pipes coaxially with pipes. Liquid prismatic reflectors are installed under convexities of panel corrugations, and on side walls of housing plate reflectors are hinge fastened, being interconnected by polymeric film with metallized coating. Hinge fastening of plate reflectors makes it possible to set angle of their tilting to provide optimum position for each climatic region and concentrate radiation on absorbing pipes arranged in peripheral zone. Connection of separate plates by polymeric film with metallized coating precludes getting of sun rays onto side walls of housing which considerably reduces heat losses through side walls.

EFFECT: enlarged operating capabilities.

4 dwg

FIELD: mining.

SUBSTANCE: invention relates to power engineering, in particular, to devices intended for generating heat produced other than by fuel combustion. The borehole thermal heat source contains a thermal water-supplying well linked to a water source, a drain zone and a thermal water consumer. The thermal water-supplying well is drilled so that its bottom crosses the driftway and serves as a water conduit. A surface reservoir, with a thermal water-supplying well being drilled thereon, an underground water-bearing zone/zones or a surface reservoir with underground zone/zones can be used as a water source. The intersection of the thermal water-supplying well with the driftway located below serves as a drain zone. Additionally, the source contains a swirling thermal water-supplying heat-generator connected with the well and installed under the dynamic level thereof. Water pressure is sufficient to produce the thermal energy; water consumer is wired up, by means of the thermal water pipeline, to the outlet of the swirling heat-generator in the drain zone of the thermal water-supplying well. The swirling heat-generator is disposed in the driftway, connected to the well in the area of its intersection with the driftway and has a pumping plant with binding. Thermal water pipeline is made as an additional well drilled from the driftway prior to its intersection with the daylight surface, in the zone of the thermal water consumer threreto the pipeline of the thermal water consumer is attached. Mouth of the additional well is connected to the pumping plant binding.

EFFECT: simplified thermal source and thermal consumer traffic channel; higher hydro-energy potential in high-water period; operational security and invulnerability.

3 cl, 1 dwg

FIELD: heating.

SUBSTANCE: geothermal installation comprises an Earth heat extraction line, a fume and condensation line of a working body of a turbine, a condenser cooling line and a consumer heat supply line. Out of the Earth heat extraction line heat is transferred into the fume and condensation line of a working body of a turbine and also is directly transferred to the consumer heat supply line. The consumer heat supply line is connected with a condenser cooling line via a heat pump.

EFFECT: invention expands features and improves processing characteristics of a power cycle considering fluctuations in modes of energy load consumption.

1 dwg

FIELD: hydrometallurgy, heating.

SUBSTANCE: invention concerns methods of geothermal energy rock mountain mass extraction and can be used during heating of buildings, structures, particularly dwellings, at the expense of conversion of geothermal heat of Earth crust in heat pump, and also in hydrometallurgy for reduction of system of minerals underground leaching energy content, including array of extracting and stripping (infiltration) boreholes. Well bore is divided by sealed partition at absorption area, located lower than sealed partition and pumping area, located higher than sealed partition, at that pumping area is completely fulfilled by heat-conducting liquid and in it is located manifold of heat taking system of thermal pump, at that in the capacity of sealed partition, separating absorption- pumping areas of well, it is used facility packer for pipeless liquid lifting from wells. Additionally in pumping area it is created stratal liquid flowage, and in absorption area it is created depression in stratal liquid, for instance by means of drowned pump, connected to facility for pipeless liquid lifting from wells. At that heat passing to refrigerant of thermal pump by manifold of heat taking system, located in pumping area of well, and extract from well by stratal liquid, is implemented in different circuits of refrigerant circulation. Additionally for systems of underground leaching, liquid, pumped into stratum through absorption well, is heated by means of placement into absorption well of one or several heat exchangers with closed circuit of coolant circulation of heat distribution system for one or several thermal pump. At that heat transfer from refrigerant of thermal pump to heat-carrying agent of heat distribution system is implemented in separated circuits of coolant circulation of heat distribution system: in closed and open, at that in the capacity of open circuit heat-carrying agent of heat distribution system of thermal pump is used solvent factor, pumped into stratum through absorption well.

EFFECT: reduction of system of minerals underground leaching energy content.

12 cl, 6 dwg

FIELD: heating systems.

SUBSTANCE: invention refers to heat engineering, and namely to geothermal power plants producing electric energy based on using the heat of geothermal sources. In a geothermal power plant with circuit of heat carrier which includes gas separator, and waste heat exchangers of gas-turbine plant exit gas heat, which are connected with a well, and heat exchangers installed in condensate feed path of steam-turbine circuit, the organic fuel combustion products after gas turbine enter immediately the direct-contact heat exchanger installed on gas separator discharge thermal water piping. Thermal water mixture together with organic fuel combustion products moves through heat exchangers installed in condensate feed path of steam-turbine plant.

EFFECT: improving operating efficiency of geothermal power plant due to preventing formation of carbonate deposits in geothermal equipment, eliminating hazard of blockage of back pumping well, improving energy potential of thermal water passing through heat exchangers, and complete elimination of pollution of the environment with organic fuel combustion products.

1 dwg

FIELD: heating.

SUBSTANCE: invention deals with method of utilising geothermal energy in heat and refrigeration supply systems. The invention concept is as follows: heated geothermal well water is utilised by an absorption heat pump generator to provide for the heat pump operation and further - for additional heating of the cold water supply system tap water to have been preheated in the absorber. When the heat pump is used to provide for heat supply in colder season water is supplied into the heat pump evaporator to be therefrom discharged back into the well with the facility-heating system water heated in the condenser. When the heat pump is used to provide for heat supply in warmer season water is utilised by the consumer to be further supplied into the heat pump condenser and therefrom discharged back into the well with the refrigeration supply system water chilled in the evaporator.

EFFECT: improved cost-efficiency of heat and refrigeration supply.

3 cl, 2 dwg

Up!