CN112963129A - Turbine-driven centrifugal pump system for offshore heavy oil recovery and steam injection and oil recovery method - Google Patents
Turbine-driven centrifugal pump system for offshore heavy oil recovery and steam injection and oil recovery method Download PDFInfo
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- CN112963129A CN112963129A CN202110377268.7A CN202110377268A CN112963129A CN 112963129 A CN112963129 A CN 112963129A CN 202110377268 A CN202110377268 A CN 202110377268A CN 112963129 A CN112963129 A CN 112963129A
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- 239000003921 oil Substances 0.000 title claims abstract description 99
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title claims abstract description 38
- 239000000295 fuel oil Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 8
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 19
- 230000001012 protector Effects 0.000 claims description 17
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000000605 extraction Methods 0.000 abstract description 6
- 230000010354 integration Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/129—Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
- F04D13/043—Units comprising pumps and their driving means the pump being fluid driven the pump wheel carrying the fluid driving means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a turbine-driven centrifugal pump system for offshore heavy oil recovery and a steam injection and oil extraction method, wherein the system comprises a downhole assembly and a ground assembly, wherein the downhole assembly comprises a hanger, a first oil pipe, a turbine, a second oil pipe, an upper switch sliding sleeve, a centrifugal pump, a lower switch sliding sleeve, a tail pipe, a sleeve, a packer and a steam injection pipeline which are connected; the ground component comprises an oil storage tank, a filter, a water injection pump and a motor; the oil storage tank is connected with the sleeve through a first pipeline; the water injection pump is connected with the upper end of the first oil pipe through a second pipeline; the upper end of the second oil pipe is connected with a filter through a third pipeline and then is led into the water injection pump; the motor is connected with the water injection pump. The invention can realize the integration of the exploitation, the injection and the production of the thick oil in the offshore oil field and meet the high-temperature requirement during steam injection.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a turbine-driven centrifugal pump system for offshore heavy oil exploitation and a steam injection and oil extraction method.
Background
The heavy oil of offshore oil field is generally mined by steam huff and puff, and each period is generally divided into four stages of steam injection, well stewing, self-blowing and production. The three stages of steam injection, well stewing and self-blowing are about 1 month, and the production period is about 11 months. During steam injection, well soaking and flowing, the pump is not operated, and the temperature is slightly higher and approaches 350 ℃. When in production, the pump starts to work, and the temperature of the produced liquid is about 150 ℃. At present, most of offshore oil field thickened oil exploitation uses an electric submersible pump, but the application of the electric submersible pump has certain limitation under the working conditions of high gas content, high well temperature, thickened oil, large liquid production change and the like.
The temperature of the steam injection stage can reach 350 ℃, and the electric submersible pump is generally used at the temperature of 120 ℃ and not more than 250 ℃. Too high a temperature can cause short service life of the motor and more faults of the electrical system, which leads to poor reliability of the electric submersible pump. The electrical submersible pump is not able to accommodate this high temperature. Therefore, the pump is required to be put down after the self-injection and be started before the steam injection in each period of the oil production of the electric submersible pump. And the operation cost is expensive when the pipe string is pulled out and pulled down in the offshore oil field. Therefore, it is necessary to design an injection-production integrated production pump suitable for high temperature, high gas-liquid processing capacity.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide a turbine-driven centrifugal pump system for offshore heavy oil recovery, which can realize the integration of the heavy oil recovery, injection and production in offshore oil fields, and meet the high temperature requirement during steam injection.
The second purpose of the invention is to provide a steam injection method of the turbine-driven centrifugal pump system for offshore heavy oil recovery.
The third purpose of the invention is to provide an oil extraction method of the offshore heavy oil extraction turbine-driven centrifugal pump system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an offshore heavy oil recovery turbine-driven centrifugal pump system which comprises a downhole assembly and a ground assembly, wherein the downhole assembly comprises a hanger, a first oil pipe, a turbine, a second oil pipe, an upper switch sliding sleeve, a centrifugal pump, a lower switch sliding sleeve, a tail pipe, a sleeve, a packer and a steam injection pipeline; the upper end of the first oil pipe is connected with the hanger, and the lower end of the first oil pipe is detachably connected with the upper end of the turbine; the lower end of the turbine is connected with the upper end of the upper switch sliding sleeve through a first connector, a turbine exhaust port is formed in the turbine, a first steam injection hole is formed in the first connector, and an upper switch sliding sleeve opening is formed in the upper switch sliding sleeve; the second oil pipe is sleeved outside the whole body formed by the hanger, the first oil pipe and the turbine, and the lower end of the second oil pipe is connected with the first joint; the lower end of the upper switch sliding sleeve is detachably connected with the upper end of the centrifugal pump; the lower end of the centrifugal pump is detachably connected with the upper end of the lower switch sliding sleeve; a centrifugal pump discharge port is arranged on the centrifugal pump; the lower end of the lower switch sliding sleeve is detachably connected with the upper end of the tail pipe, a lower switch sliding sleeve opening is formed in the lower switch sliding sleeve, and a second steam injection hole is formed in the tail pipe; the sleeve is sleeved outside the whole formed by the second oil pipe, the first joint, the upper switch sliding sleeve, the centrifugal pump, the lower switch sliding sleeve and the tail pipe, and the upper end of the sleeve extends out of the ground and is fixed with the ground; the packer is sleeved outside the centrifugal pump or the tail pipe and used for sealing a space between the centrifugal pump and the casing pipe; the upper end of the steam injection pipeline is connected with the opening of the upper switch sliding sleeve, and the lower end of the steam injection pipeline is connected with a second steam injection hole in the tail pipe; the ground component comprises an oil storage tank, a filter, a water injection pump and a motor; the oil storage tank is connected with the sleeve through a first pipeline; the water injection pump is connected with the upper end of the first oil pipe through a second pipeline; the upper end of the second oil pipe is connected with a filter through a third pipeline and then is led into the water injection pump; the motor is connected with the water injection pump.
The offshore heavy oil recovery turbine-driven centrifugal pump system preferably further comprises a protector; the protector is arranged between the turbine and the first joint, the upper end of the protector is detachably connected with the turbine, the lower end of the protector is in threaded connection with the first joint, and the protector is filled with lubricating oil and is provided with a dynamic pressure thrust bearing to bear the axial force of the system.
The offshore heavy oil recovery turbine-driven centrifugal pump system is characterized in that a safety valve is preferably arranged in the tail pipe.
The offshore heavy oil recovery turbine-driven centrifugal pump system preferably further comprises an upper switch sliding sleeve hydraulic pipeline, and the upper switch sliding sleeve hydraulic pipeline is connected with the upper switch sliding sleeve and used for controlling the opening and closing of the upper switch sliding sleeve.
The offshore heavy oil recovery turbine-driven centrifugal pump system preferably further comprises a lower switch sliding sleeve hydraulic pipeline, and the lower switch sliding sleeve hydraulic pipeline is connected with the lower switch sliding sleeve and used for controlling the opening and closing of the lower switch sliding sleeve.
The invention relates to a steam injection method of an offshore heavy oil recovery turbine-driven centrifugal pump system, which comprises the following steps:
1) opening the upper switch sliding sleeve and closing the lower switch sliding sleeve;
2) injecting steam from an annular space between the first oil pipe and the second oil pipe, wherein the steam is injected into the upper switch sliding sleeve along a first steam injection hole on a first joint between the turbine and the upper switch sliding sleeve;
3) because the upper switch sliding sleeve is in an open state, steam is discharged from the opening of the upper switch sliding sleeve and is injected into the tail pipe along the steam injection pipeline, so that steam injection is completed; at the moment, because the lower switch sliding sleeve is in a closed state, steam cannot enter the lower switch sliding sleeve from the opening of the lower switch sliding sleeve and returns to the ground along the centrifugal pump.
The invention relates to an oil extraction method of an offshore heavy oil recovery turbine-driven centrifugal pump system, which comprises the following steps:
a. closing the upper switch sliding sleeve and opening the lower switch sliding sleeve;
b. injecting power liquid: the power fluid is pressurized by an injection pump in the ground assembly and injected through a first oil pipe, wherein most of the power fluid rotates at a high speed through a driving shaft of a turbine and is discharged from a turbine discharge port, and the power fluid is lifted to the ground through an annular space between the first oil pipe and a second oil pipe after being discharged, and at the moment, the power fluid cannot enter an oil reservoir along a steam injection channel because an upper switch sliding sleeve is in a closed state;
c. oil reservoir liquid is by the centrifugal pump suction, at this moment, because the lower switch sliding sleeve is in open mode, oil reservoir liquid gets into the lower switch sliding sleeve from the lower switch sliding sleeve opening, through the centrifugal pump and discharge from the centrifugal pump discharge port, lifts to ground entering oil storage tank through the annular space between sleeve pipe and the second oil pipe again.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the power liquid is used as a power source, so that electrical elements are saved, the reliability is high, and the service life is long;
2. the offshore heavy oil recovery, injection and production integration is completed, and the defect that an electric submersible pump cannot resist high temperature is overcome;
3. the liquid production amount can be adjusted by adjusting the pressure and the injection amount of the power liquid.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an offshore heavy oil recovery turbine-driven centrifugal pump system according to the invention;
FIG. 2 is a schematic illustration of the downhole assembly of FIG. 1;
FIG. 3 is a schematic view of a steam injection cycle of the offshore heavy oil recovery turbine-driven centrifugal pump system according to the present invention;
fig. 4 is a schematic view of the oil recovery cycle of the offshore heavy oil recovery turbine-driven centrifugal pump system according to the present invention.
The reference numerals in the figures are as follows:
1-a hanger; 2-a first tubing; 3-a turbine; 301-turbine exhaust; 4-a second tubing; 5, installing a switch sliding sleeve; 501-opening the upper switch sliding sleeve; 6-a centrifugal pump; 601-centrifugal pump discharge port; 7-opening and closing the sliding sleeve; 701-opening the switch sliding sleeve at the lower part; 8-tail pipe; 9-a sleeve; 10-a packer; 11-steam injection line; 12-a first joint; 1201-first steam injection hole; 13-a second linker; 14-an oil storage tank; 15-a filter; 16-a water injection pump; 17-an electric motor; 18-a first line; 19-a second line; 20-a third line; 21-a protector; 22-safety valve; 23-upper switch sliding sleeve hydraulic pipeline; and 24-switching on and off the sliding sleeve hydraulic pipeline.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1 and fig. 2, the offshore heavy oil recovery turbine-driven centrifugal pump system provided by the invention comprises a downhole assembly and a surface assembly, wherein the downhole assembly comprises a hanger 1, a first oil pipe 2, a turbine 3, a second oil pipe 4, an upper switch sliding sleeve 5, a centrifugal pump 6, a lower switch sliding sleeve 7, a tail pipe 8, a casing 9, a packer 10 and a steam injection pipeline 11; the upper end of the first oil pipe 2 is connected with the hanger 1, and the lower end is detachably connected with the upper end of the turbine 3, wherein the detachable connection mode can adopt a threaded connection of an oil pipe joint (not shown in the figure); the lower end of the turbine 3 is connected with the upper end of the upper switch sliding sleeve 5 through a first joint 12, a turbine exhaust port 301 is arranged on the turbine, a first steam injection hole 1201 is formed in the first joint 12, and an upper switch sliding sleeve opening 501 is formed in the upper switch sliding sleeve 5; the second oil pipe 4 is sleeved outside the whole body formed by the hanger 1, the first oil pipe 2 and the turbine 3, and the lower end of the second oil pipe 4 is connected with the first joint 12; the lower end of the upper switch sliding sleeve 5 is detachably connected with the upper end of the centrifugal pump 6 in a threaded connection mode through a second connector 13; the lower end of the centrifugal pump 6 is detachably connected with the upper end of the lower switch sliding sleeve 7, and specifically is in threaded connection; a centrifugal pump discharge port 601 is arranged on the centrifugal pump 6; the lower end of the lower switch sliding sleeve 7 is detachably connected with the upper end of the tail pipe 8 in a detachable connection mode that an oil pipe joint (not shown in the figure) is adopted for connection, a lower switch sliding sleeve opening 701 is arranged on the lower switch sliding sleeve 7, and a second steam injection hole (not shown in the figure) is formed in the tail pipe 8; the sleeve 9 is sleeved outside the whole body formed by the second oil pipe 4, the first joint 12, the upper switch sliding sleeve 5, the centrifugal pump 6, the lower switch sliding sleeve 7 and the tail pipe 8, and the upper end of the sleeve 9 extends out of the ground and is fixed with the ground; the packer 10 is sleeved outside the centrifugal pump 6 or the tail pipe 8 and used for sealing the space between the centrifugal pump 6 and the casing pipe 9; the upper end of the steam injection pipeline 11 is connected with the opening 501 of the upper switch sliding sleeve, and the lower end is connected with a second steam injection hole (not shown) on the tail pipe 8.
The surface assembly comprises an oil storage tank 14, a filter 15, a water injection pump 16 and a motor 17; the oil storage tank 14 is connected to the casing 9 through a first line 18; a water injection pump 16 is connected with the upper end of the first oil pipe 2 through a second pipeline 19; the upper end of the second oil pipe 4 is connected with a filter 15 through a third pipeline 20 and then is led into a water injection pump 16; the motor 17 is connected to the water injection pump 16.
In the above embodiment, preferably, as shown in fig. 2, the offshore heavy oil recovery turbine-driven centrifugal pump system further includes a protector 21; the protector 21 is arranged between the turbine 3 and the first joint 12, the upper end of the protector 21 is detachably connected with the turbine 3, specifically, joint threaded connection can be adopted, the lower end of the protector 21 is in threaded connection with the first joint 12, and lubricating oil is filled in the protector and a dynamic pressure thrust bearing is arranged in the protector to bear axial force of the system.
In the above embodiment, it is preferable that a safety valve 22 is provided in the tail pipe 8, whereby, when a problem occurs in the pipe string, the safety valve is closed to ensure that the entire pipe string passage is closed, thereby preventing a blowout accident from occurring.
In the above embodiment, preferably, the offshore heavy oil recovery turbine-driven centrifugal pump system further comprises an upper switch sliding sleeve hydraulic pipeline 23, and the upper switch sliding sleeve hydraulic pipeline 23 is connected with the upper switch sliding sleeve 5 and is used for controlling the opening and closing of the upper switch sliding sleeve 5.
In the above embodiment, preferably, the offshore heavy oil recovery turbine-driven centrifugal pump system further includes a lower switch sliding sleeve hydraulic pipeline 24, and the lower switch sliding sleeve hydraulic pipeline 24 is connected to the lower switch sliding sleeve 7 and is used for controlling the opening and closing of the lower switch sliding sleeve 7.
As shown in fig. 3, based on the above-mentioned offshore heavy oil recovery turbine-driven centrifugal pump system, the present invention further provides a steam injection method for the offshore heavy oil recovery turbine-driven centrifugal pump system, which includes the following steps:
1) opening the upper switch sliding sleeve and closing the lower switch sliding sleeve;
2) injecting steam from an annular space between the first oil pipe and the second oil pipe, wherein the steam is injected into the upper switch sliding sleeve along a first steam injection hole on a first joint between the turbine and the upper switch sliding sleeve;
3) because the upper switch sliding sleeve is in an open state, steam is discharged from the opening of the upper switch sliding sleeve and is injected into the tail pipe along the steam injection pipeline, so that steam injection is completed; at the moment, because the lower switch sliding sleeve is in a closed state, steam cannot enter the lower switch sliding sleeve from the opening of the lower switch sliding sleeve and returns to the ground along the centrifugal pump.
As shown in fig. 4, based on the above-mentioned offshore heavy oil recovery turbine-driven centrifugal pump system, the present invention further provides an oil recovery method for an offshore heavy oil recovery turbine-driven centrifugal pump system, which includes the following steps:
a. closing the upper switch sliding sleeve and opening the lower switch sliding sleeve;
b. injecting power liquid: the power fluid is pressurized by an injection pump in the ground assembly and injected through a first oil pipe, wherein most of the power fluid rotates at a high speed through a driving shaft of a turbine and is discharged from a turbine discharge port, and the power fluid is lifted to the ground through an annular space between the first oil pipe and a second oil pipe after being discharged, and at the moment, the power fluid cannot enter an oil reservoir along a steam injection channel because an upper switch sliding sleeve is in a closed state;
c. oil reservoir liquid is by the centrifugal pump suction, at this moment, because the lower switch sliding sleeve is in open mode, oil reservoir liquid gets into the lower switch sliding sleeve from the lower switch sliding sleeve opening, through the centrifugal pump and discharge from the centrifugal pump discharge port, lifts to ground entering oil storage tank through the annular space between sleeve pipe and the second oil pipe again.
The power part of the offshore heavy oil recovery turbine-driven centrifugal pump system is that a ground water injection pump pressurizes power liquid so as to drive the power liquid; the turbine drives the centrifugal pump, the turbine and the centrifugal pump are the same shaft, during operation, the pressure is boosted through the aboveground water injection pump, the underground turbine is driven to rotate in a mode that the first oil pipe injects power liquid into the underground oil extraction equipment, and then the centrifugal pump on the same shaft is driven to lift the liquid.
The working form of the invention adopts a closed-loop mode, namely, the power fluid and the reservoir fluid respectively form a set of circulating pipelines, and the power fluid and the reservoir fluid are not influenced with each other. The power fluid returns to the ground through the annulus of the 1.9 'first oil pipe and the 4-1/2' second oil pipe and enters the water storage tank for recycling; reservoir fluid returns to the surface through a 4-1/2 'second oil pipe and a 9-5/8' casing annulus and enters the oil storage tank, and the reservoir fluid and the underground reservoir stock fluid are isolated through a packer.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A turbine-driven centrifugal pump system for offshore heavy oil recovery comprises a downhole assembly and a ground assembly, and is characterized in that the downhole assembly comprises a hanger, a first oil pipe, a turbine, a second oil pipe, an upper switch sliding sleeve, a centrifugal pump, a lower switch sliding sleeve, a tail pipe, a sleeve, a packer and a steam injection pipeline;
the upper end of the first oil pipe is connected with the hanger, and the lower end of the first oil pipe is detachably connected with the upper end of the turbine;
the lower end of the turbine is connected with the upper end of the upper switch sliding sleeve through a first connector, a turbine exhaust port is formed in the turbine, a first steam injection hole is formed in the first connector, and an upper switch sliding sleeve opening is formed in the upper switch sliding sleeve;
the second oil pipe is sleeved outside the whole body formed by the hanger, the first oil pipe and the turbine, and the lower end of the second oil pipe is connected with the first joint;
the lower end of the upper switch sliding sleeve is detachably connected with the upper end of the centrifugal pump; the lower end of the centrifugal pump is detachably connected with the upper end of the lower switch sliding sleeve; a centrifugal pump discharge port is arranged on the centrifugal pump;
the lower end of the lower switch sliding sleeve is detachably connected with the upper end of the tail pipe, a lower switch sliding sleeve opening is formed in the lower switch sliding sleeve, and a second steam injection hole is formed in the tail pipe;
the sleeve is sleeved outside the whole formed by the second oil pipe, the first joint, the upper switch sliding sleeve, the centrifugal pump, the lower switch sliding sleeve and the tail pipe, and the upper end of the sleeve extends out of the ground and is fixed with the ground;
the packer is sleeved outside the centrifugal pump or the tail pipe and used for sealing a space between the centrifugal pump and the casing pipe;
the upper end of the steam injection pipeline is connected with the opening of the upper switch sliding sleeve, and the lower end of the steam injection pipeline is connected with a second steam injection hole in the tail pipe;
the ground component comprises an oil storage tank, a filter, a water injection pump and a motor;
the oil storage tank is connected with the sleeve through a first pipeline; the water injection pump is connected with the upper end of the first oil pipe through a second pipeline; the upper end of the second oil pipe is connected with a filter through a third pipeline and then is led into the water injection pump; the motor is connected with the water injection pump.
2. The offshore heavy oil recovery turbine-driven centrifugal pump system of claim 1, further comprising a protector; the protector is arranged between the turbine and the first joint, the upper end of the protector is detachably connected with the turbine, the lower end of the protector is in threaded connection with the first joint, and the protector is filled with lubricating oil and is provided with a dynamic pressure thrust bearing to bear the axial force of the system.
3. The offshore heavy oil recovery turbine-driven centrifugal pump system of claim 1, wherein a safety valve is disposed in the tailpipe.
4. The offshore heavy oil recovery turbine-driven centrifugal pump system of claim 1, further comprising an upper switch sliding sleeve hydraulic line connected to the upper switch sliding sleeve for controlling the opening and closing of the upper switch sliding sleeve.
5. The offshore heavy oil recovery turbine-driven centrifugal pump system of claim 1, further comprising a lower switch sliding sleeve hydraulic pipeline, wherein the lower switch sliding sleeve hydraulic pipeline is connected with the lower switch sliding sleeve and used for controlling the opening and closing of the lower switch sliding sleeve.
6. A steam injection method based on the offshore heavy oil recovery turbine-driven centrifugal pump system of any one of claims 1 to 5, characterized by comprising the following steps:
1) opening the upper switch sliding sleeve and closing the lower switch sliding sleeve;
2) injecting steam from an annular space between the first oil pipe and the second oil pipe, wherein the steam is injected into the upper switch sliding sleeve along a first steam injection hole on a first joint between the turbine and the upper switch sliding sleeve;
3) because the upper switch sliding sleeve is in an open state, steam is discharged from the opening of the upper switch sliding sleeve and is injected into the tail pipe along the steam injection pipeline, so that steam injection is completed; at the moment, because the lower switch sliding sleeve is in a closed state, steam cannot enter the lower switch sliding sleeve from the opening of the lower switch sliding sleeve and returns to the ground along the centrifugal pump.
7. An oil recovery method based on the offshore heavy oil recovery turbine-driven centrifugal pump system of any one of claims 1 to 5, characterized by comprising the following steps:
a. closing the upper switch sliding sleeve and opening the lower switch sliding sleeve;
b. injecting power liquid: the power fluid is pressurized by an injection pump in the ground assembly and injected through a first oil pipe, wherein most of the power fluid rotates at a high speed through a driving shaft of a turbine and is discharged from a turbine discharge port, and the power fluid is lifted to the ground through an annular space between the first oil pipe and a second oil pipe after being discharged, and at the moment, the power fluid cannot enter an oil reservoir along a steam injection channel because an upper switch sliding sleeve is in a closed state;
c. oil reservoir liquid is by the centrifugal pump suction, at this moment, because the lower switch sliding sleeve is in open mode, oil reservoir liquid gets into the lower switch sliding sleeve from the lower switch sliding sleeve opening, through the centrifugal pump and discharge from the centrifugal pump discharge port, lifts to ground entering oil storage tank through the annular space between sleeve pipe and the second oil pipe again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110377268.7A CN112963129A (en) | 2021-04-08 | 2021-04-08 | Turbine-driven centrifugal pump system for offshore heavy oil recovery and steam injection and oil recovery method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110377268.7A CN112963129A (en) | 2021-04-08 | 2021-04-08 | Turbine-driven centrifugal pump system for offshore heavy oil recovery and steam injection and oil recovery method |
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| CN112963129A true CN112963129A (en) | 2021-06-15 |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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