Method of development of water-flooded oil reservoir with microwave electromagnetic effect (versions)

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the field of oil industry and can be used for enhanced oil recovery of the reservoir in the development of water-flooded reservoirs with viscous oil and bitumen at a late stage of development. The method comprises opening the reservoir with the ability to transfer the production well into the injection one, the reservoir processing, keeping the hole without any influence, intake of oil from the reservoir. At that a system of microwave electromagnetic generators with radiation frequency of 2.5 GHz is lowered into the injection well, connected to the slot antenna using the feeder. The length of the slot antenna is selected equal to the thickness of the aquifer of the reservoir. In the mode of injection, the water injection into the reservoir is carried out with simultaneous influence on the reservoir with microwave electromagnetic field, the radiation power is determined by the time of heating of the water injected in the downhole to the desired temperature. When filling 5-10% of the volume of the pore space of the formation, the well is maintained, the well is transferred into the production well, and the liquid intake from the production well is carried out.

EFFECT: increase of the effectiveness and economical efficiency of development of water-flooded reservoirs of high-viscosity oil, intensification of oil production in water-flooded reservoirs of high-viscosity oil by increasing the coverage with influence to the reservoir with heating in the bottomhole area of the reservoir of the production wells.

2 cl, 3 dwg

 

The invention relates to oil industry and can be used to enhance oil recovery in the development of water-flooded reservoirs with viscous oil and bitumen at a late stage of development.

The known method of extraction of minerals which comprises heating the layer of the high frequency electromagnetic field through production wells oil production (U.S. patent 2757738, EV 43/00). High-frequency electromagnetic energy is transferred from the wellhead to the bottom. As transmission lines are coaxial system of tubing and casing. Energy and force interaction of high frequency electromagnetic waves with formation leads to the emergence of distributed volume heat sources, resulting in a lower viscosity of the reservoir fluid.

The disadvantages of this method is the large energy losses during energy transfer from the mouth to the bottom hole, the small penetration depth of electromagnetic waves, the low coverage of the formation heating. This method is not applicable in the development of waterlogged deposits.

The closest in technical essence to the claimed method is a method involving exposure of the layer of high-frequency electromagnetic field with simultaneous injection of miscible Agay�TA - solvent (patent RF 2454532). The method involves the exposure of high-frequency electromagnetic field with simultaneous injection of the solvent into the well. Doing an autopsy of a layer of at least one well, at first producing well was transferred to a pressure mode, then subjected to exposure to high frequency electromagnetic field with simultaneous injection of miscible solvent to fill 5-10% of the pore volume of the formation; then carry out an excerpt of the well without any impact, the duration of which is determined by the relaxation time of the pressure in the reservoir. Then the well is transferred to the mode of production and carry out the selection of product from the reservoir without high frequency electromagnetic exposure, the duration of the selection of the product is determined by the time of lowering the temperature at the well bottom not below the initial reservoir temperature, after which the operation is repeated cyclically.

The disadvantage of this method is its inefficiency in the method in flooded reservoirs with viscous oil and bitumen at a late stage of development, as high-frequency electromagnetic waves emitted in deposits will be reflected from the boundary of the water-oil and water-rock that in turn may lead to failure of the equipment performing the method.

Those�technical result of the invention is improving the efficiency and profitability of the development of irrigated high-viscous oil deposits, intensification of oil production in irrigated deposits of heavy oil by increasing the coverage of the influence on layer by heating in the bottom hole formation zone of producing wells, the maximum energy use of a microwave electromagnetic field with the help of additional heat transfer into the reservoir, the injected water.

The technical result can be achieved in two versions:

1) To the injection well drained system of microwave electromagnetic generators with frequency of 2.5 GHz, coupled with a slot antenna through the feeder, the length of the slit antenna L is chosen equal to the thickness of the aquifer in the area of the stratum H, then subjected to the effect of microwave electromagnetic field with simultaneous injection of water. The radiation power is determined by the heating time of the injected water in the bottom hole to the required temperature:

N=pCΔTQ(1rc2Rn),(1)

where ρ is the density of the injected water, kg/m3; Rn- radius of bottom-hole formation zone, which must be heated, m; C - heat capacity of the injected water, j/kg*K; ΔT is different�nce between the final and initial temperatures of water in the mine, K; Q is the flow rate of injected water, m3/s; rcis the well radius, m; then at the production wells produce fluid sampling.

2) Conduct an autopsy of the reservoir, at least one well, at first producing well was transferred to a pressure mode, pull system of microwave electromagnetic generators with frequency of 2.5 GHz, coupled with a slot antenna through the feeder, the length of the slit antenna L is chosen equal to the thickness of the aquifer in the area of the stratum H, then subjected to the effect of microwave electromagnetic field with simultaneous injection of water to fill 5-10% of the volume of the pore space of the reservoir, the radiation power is determined by the formula (1), then carry out the shutter speed well without any impact, the duration of which is determined by the relaxation time of the pressure in the reservoir:

tp=RK2χ,tI<tin<tp(2)

where tpis the relaxation time, s, RK- distance to the boundary of the borehole, m, χ - coefficient of piezoresonance of the reservoir, m2/s, tin- the length of the holding wells, s, tI/sub> - the installation of the equipment for sampling fluid from a formation,

then the well is transferred to the mode of production and carry out the selection of product from the reservoir without the microwave electromagnetic effects, the duration of the selection of the product is determined by the time of lowering the temperature at the well bottom not below the initial reservoir temperature, after which the operation is repeated cyclically.

Fig.1 shows a diagram of the arrangement of wells of the first variant implementation. Legend: 1 - the reservoir containing oil and water; 2 - injection well; 3 - system of microwave electromagnetic generators; 4 - feeder; 5 - slot antenna; 6 - volumetric sources of heat generated in the productive formation when exposed to microwave electromagnetic field; 7 - producing well.

Fig.2 is a diagram of arrangement of wells of the second variant implementation. Legend: 1 - the reservoir containing oil and water; 2 - injection well; 3 - system of microwave electromagnetic generators; 4 - feeder; 5 - slot antenna; 6 - volumetric sources of heat generated in the productive formation when exposed to microwave electromagnetic fields.

Fig.3 shows the dynamics of temperature change in the bottom hole formation zone when exposed to the layer of microwave electromagnetic field and co-injection of water at different points of time (curve 1 - che�from 30 minutes of exposure; curve 2 - after 3 hours of exposure; curve 3 - after 12 hours of exposure; curve 4 - after 24 hours of exposure).

The method is carried out in the following sequence.

I variant implementation.

In injection well 1 down system of microwave electromagnetic generators 3 with a frequency of 2.5 GHz, coupled with a slot antenna through the feeder. The slit length of the antenna L is chosen equal to the thickness of the aquifer in the area of the stratum H. Carry out the effect of microwave electromagnetic field with simultaneous injection of water. At the same time incorporate a system of microwave electromagnetic generators and emit in the bottomhole formation zone of the microwave electromagnetic waves. The radiation power is determined by the heating time of the injected water in the bottom of the well to a predetermined temperature according to the formula (1). Due to dielectric losses in the reservoir 5, the microwave electromagnetic energy is converted into thermal energy in the reservoir 5 appear volumetric heat sources of heat. The water injected into the formation, transfers heat into the formation 5. Due to the heating of the reservoir fluid increases the mobility of the reservoir fluid and the coverage of the formation by thermal effects. In a producing well 4 produces a fluid sampling.

II variant implementation.

Production well 1 is transferred to the pressure mode. In injection well 1 down system of microwave e�ctromagnetic generators 3 with a frequency of 2.5 GHz, connected to a slot antenna through the feeder. The slit length of the antenna L is chosen equal to the thickness of the aquifer in the area of the stratum H. By pump-compressor pipe is injected into the reservoir water. At the same time incorporate a system of microwave electromagnetic generators and emit in the bottomhole formation zone of the microwave electromagnetic wave with a frequency of 2.5 GHz. The radiation power is determined by the heating time of the injected water in the bottom of the well to a predetermined temperature according to the formula (1). Due to dielectric losses in the reservoir 5, the microwave electromagnetic energy is converted into thermal energy in the reservoir 5 appear volumetric heat sources of heat. The water injected into the formation, transfers heat into the formation 5. Due to the heating of the reservoir fluid increases the mobility of the reservoir fluid and the coverage of the formation by thermal effects. The effect of microwave electromagnetic field and the injection of water continues to fill 5-10% of the volume of the first space of the reservoir water.

Then stop the stimulation and exercise "restraint" of the well 1. In the reservoir 5 is a redistribution of pressure and temperature. While redistributing pressure in the reservoir 5, the accumulation of reservoir energy by increasing reservoir pressure, which subsequently increases the amount of extracted oil. The exposure time tin is estimated by the relaxation time reservoir pressure (during which it is expected the installation of equipment for sampling fluid from the reservoir 5 and back translation of the well 1 in production) according to the formula (2).

Then the borehole 1 is transferred to the mode of production and carry out the selection of oil. The duration of selection of tinis determined by reducing the temperature at the well bottom, which should be not below the initial reservoir temperature.

Example 1. Produce effects on the reservoir with water cut of 70%, containing oil with a viscosity of 620 MPa*s at reservoir temperature of 21°C. the Porosity of a formation of 0.29. The permeability of 0.6 μm2. The distance to the boundary of the well R=92 m, the coefficient of piezoresonance layer 0,0003 m2/S.

In an injection well lowered system of microwave electromagnetic generators with frequency of 2.5 GHz, coupled with a slot antenna through the feeder. The slit length of the antenna L is chosen equal to the thickness of the aquifer region of layer N is equal to 6 m. After which it was carried out the effect of microwave electromagnetic field on the formation with simultaneous injection of water with flow rate of 15 m3/day. Power system microwave generators of electromagnetic waves was 18 kW. From a producing well is carried out the selection of oil. Additional oil production amounted to 125 tons.

Example 2. Production�Ried out effects on the reservoir with water cut of 65%, containing oil with a viscosity of 500 MPa*s at reservoir temperature of 18°C. the porosity of the layer is 0.32. The permeability of 0.5 μm2. The distance to the boundary of the well R=115 m, the coefficient of piezoresonance formation of a 0.00025 m2/S.

First producing well was transferred to a pressure mode. In the well 1 has launched a system of microwave electromagnetic generators with frequency of 2.5 GHz, coupled with a slot antenna through the feeder. The slit length of the antenna L is chosen equal to the thickness of the aquifer region of layer N is equal to 12 m. After which it was carried out the effect of microwave electromagnetic field on the formation with simultaneous injection of water to fill the 6.25% feather spaces of the formation. Power system microwave generators of electromagnetic waves amounted to 22 kW. The exposure time was 24 hours. Carried out extract well with a duration of 1 day. Further selection was carried out oil to reduce the temperature at the bottom to 18°C. In this case, additional oil production amounted to 162 tons.

The use of the inventive method compared to known methods will improve the recovery of hydrocarbons by 10-12%.

1. Method of development of flooded oil reservoirs microwave electromagnetic influence, including the opening of the layer, processing layer, the selection of oil from the reservoir, characterized in that the injection well with�will escaut system of microwave electromagnetic generators with frequency of 2.5 GHz, connected to a slot antenna through the feeder, the length of the slit antenna L is chosen equal to the thickness of the aquifer in the area of the stratum H and carry out stimulation of the microwave electromagnetic field with simultaneous injection of water, the radiation power is determined by the heating time of the injected water in the bottom hole to the required temperature:
N=ρCΔTQ(1rc2Rn)
where ρ is the density of the injected water, kg/m3; Rn- radius of bottom-hole formation zone, which must be heated, m; C - heat capacity of the injected water, j/kg*K; ΔT is the difference between the final and initial temperatures of water in the mine, K; Q is the flow rate of injected water, m3/s; rcis the well radius, m,
then at the production wells produce fluid sampling.

2. Method of development of flooded oil reservoirs microwave electromagnetic influence, including the opening of the reservoir, the translation of the producing well to injection, the processing layer, the shutter speed well without any impact, the selection of oil from the reservoir, characterized in that the first producing well was transferred to a discharge mode, in an injection well drained ICU�him of microwave electromagnetic generators with frequency of 2.5 GHz, connected to a slot antenna through the feeder, the length of the slit antenna L is chosen equal to the thickness of the aquifer in the area of the stratum H and in the pressure mode carry out the injection of water into the formation with simultaneous stimulation of the microwave electromagnetic field, the radiation power is determined by the heating time of the injected water in the bottom hole to the required temperature:
N=ρCΔTQ(1rc2Rn)
where ρ is the density of the injected water, kg/m3; Rn- radius of bottom-hole formation zone, which must be heated, m; C - heat capacity of the injected water, j/kg*K; ΔT is the difference between the final and initial temperatures of water in the mine, K; Q is the flow rate of injected water, m3/s; rcis the well radius, m; while filling 5-10% of the volume of the pore space of the reservoir carried out in an extract of the well, place the well in production and carry out the selection of fluid from the producing well.



 

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1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil well development and operation involves landing of tubing string with well pump with power cable to the well, and landing of capillary tube parallel to the power cable and attached to external surface of the tubing string by clamps. Oil or oil-containing reservoir fluid is produced. Chemical reagent is injected to the well from a tank by a metering pump through the capillary tube. Power cable is inserted to the well through cable gland. Power cable and capillary tube are protected against direct contact with internal well surface by protectors. Electric heater with extension unit, well pump with power cable and sleeve with radial hole to which the capillary tube is connected are inserted into the tubing upwards from the bottom at the wellhead. Electric heater extension unit is connected to the power cable of well pump. The tubing is landed to the well so that its shoe is located at least 2 m lower than bottom of high-viscosity oil reservoir, and electric heater is facing perforation interval of the high-viscosity oil reservoir. At the wellhead, power cable is connected to well pump and electric heater control stations and inserted to the well through cable gland. Capillary tube is inserted to the well through sealed side tap of the well X-mas tree. Electric heater is actuated, and a process break is made for 8 hours to heat bottomhole zone of reservoir in the perforation interval and high-viscosity oil heating at the inlet of well pump. After the process break, well pump is launched simultaneously with the metering pump supplying high-viscosity oil flux via the capillary tube through the radial hole in the sleeve to inner space of the tubing above the well pump.

EFFECT: enhanced well yield, reduced load in the well pump.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil or bitumen field development involves construction of two horizontal wells, one above the other, steam injection to the reservoir, reservoir heating by steam pocket formation, steam and hydrocarbon solvent injection to horizontal injector, and product sweeping from horizontal producer. Associated gas is used as hydrocarbon solvent. Steam and associated gas are injected in sequence in cycles. Steam is injected to the reservoir until extracted product viscosity is 3-5 times higher than initial viscosity at the cycle start, associated gas injection is started along with product extraction until extracted product temperature is reduced by 10-25%, then steam and associated gas injection cycles are repeated.

EFFECT: expanded reservoir coverage, higher level of high-viscosity oil and bitumen production along with material and power cost reduction.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of oil field development by a horizontal and vertical well system using thermal impact involves horizontal and vertical well drilling and equipment, so that vertical well bottom is located below horizontal well bottom at a design vertical distance of 3 to 7 m, formation of heating area by injection of combustible oxidising mixture (COM) and combustion initiator (CI) to ignite and warm-up the inter-well zone up to 100-200°C, depending on COM and CI type, and to establish hydrodynamic connection between wells; horizontal well is switched to liquid production by a pump, with continued supply of COM and CI to the vertical well to maintain burning and warming-up of the field to 250-350°C which is the temperature of independent burning of COM; afterwards, CI supply is stopped, and COM injection continues to maintain and promote burning along the horizontal wellbore. During construction, horizontal well is equipped with a filter with several zones along the horizontal section length. Before pump landing in the horizontal well, a liner with thermocouples installed inside it for temperature monitoring inside the well opposite to filter zones, that allows for serial opening of only one zone during turning and for shutting filter zones from bottomhole to wellhead. Zone adjoining the bottomhole is opened initially. After combustion initiation, if temperature in this zone falls down from the maximum achievable by combustion in the field conditions to 85-95°C, product pumping is stopped, the liner is turned from wellhead to a definite angle ensuring bottomhole zone shutoff and opening of the next zone used for further product extraction by pumping. After temperature in this zone changes from the maximum achievable by combustion in the field conditions to 85-95°C, this zone is closed by a turn of the liner opening the next zone from the bottomhole, and similarly zones are opened and shut in sequence till the last filter zone from the bottomhole.

EFFECT: optimised operation of horizontal well, reduced power cost of its operation, expanded effective coverage of horizontal producer effect, reduced content of gas in the product extracted, enhanced depletion of oil field stock.

1 ex, 3 tbl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: under this method the field is drilled according to row system with triangle grid of wells. Work agent is injected in the injection wells. Oil production is performed from production wells. At initial stage of the field development the production reservoir is presented by two horizons, if divided by central separating row of injecting wells with spacing between wells at least 300 m. Central separating row is arranged along line of maximum pay structure, the injection wells in it are made with opening by common filter of the both horizons. The closest first row of the production wells is drilled at distanced from the central row at least 500 m. Other areas of the reservoir are drilled with spacing between wells 300-400 m. After injection of the central row of the injection wells to 0.4-0.7 unit fractions of the pore volume to nearest rows of the production wells at least 90% wells of the central row are shutdown. After oil withdrawal at the entire field to 90% of initial oil productive capacity between the central separating row of the injection wells and nearest row of the production wells the sealing row of the production wells is drilled. Wells of the central row are switched to production at top horizon. During watering of the production wells of the first row to 98% they are switched to water injection.

EFFECT: increased oil recovery factor of the field.

2 ex, 2 dwg

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