CN112922846A - Hydraulic submersible pump for lifting oil at bottom of well in thermal recovery of oil field - Google Patents
Hydraulic submersible pump for lifting oil at bottom of well in thermal recovery of oil field Download PDFInfo
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- CN112922846A CN112922846A CN202110138751.XA CN202110138751A CN112922846A CN 112922846 A CN112922846 A CN 112922846A CN 202110138751 A CN202110138751 A CN 202110138751A CN 112922846 A CN112922846 A CN 112922846A
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- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 81
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 230000003068 static effect Effects 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 230000000149 penetrating effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 155
- 239000000295 fuel oil Substances 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 239000010687 lubricating oil Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 230000001050 lubricating effect Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 14
- 230000002706 hydrostatic effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000010793 Steam injection (oil industry) Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery of an oil field, which comprises: the oil-out sleeve, the steam inner tube, the power liquid inner tube, the turbo pump, the centrifugal pump, first coupling, first switch sliding sleeve coupling assembling, open oil circulation sleeve, steam delivery pipeline, tail pipe, second switch sliding sleeve coupling assembling, static thrust bearing. The submersible pump of the invention takes power liquid as power of the turbine pump and the centrifugal pump, and is driven by a mechanical type instead of the existing motor, thereby saving electrical components, having high reliability and long service life; and the static thrust bearing is used, so that the axial bearing capacity of the submersible pump is greatly improved; meanwhile, the submersible pump can realize the integration of injection and production of offshore heavy oil, and the power fluid is used as the lubricating fluid of the bearing, so that the defect that the electric submersible pump, other types of bearings and lubricating oil cannot resist high temperature is overcome.
Description
Technical Field
The invention relates to the technical field of oil field oil exploitation equipment, in particular to a hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery of an oil field.
Background
At present, 50% of oil reservoirs in the world belong to unconventional oil reservoirs, and in some oil fields at home and abroad, the conventional crude oil productivity is gradually reduced, so that the exploration and development of heavy oil are more and more emphasized.
The offshore oil exploitation mainly uses an electric submersible centrifugal pump to carry out oil exploitation. In order to adapt to the problem of high temperature in the well caused by oil extraction of deep wells and ultra-deep wells, the well-known oil equipment manufacturing companies at home and abroad design and manufacture electric submersible centrifugal pumps which can run in the well at about 200 ℃. However, when the downhole temperature exceeds 200 ℃, particularly when oil extraction is carried out at 350 ℃, the motor in the submersible centrifugal pump and the bearing lubricated by the conventional lubricating oil are difficult to adapt to the high-temperature environment, so that the existing electric submersible centrifugal pump has certain limitation on high-temperature extraction of offshore heavy oil.
Therefore, the technical personnel in the field need to solve the problem how to provide a hydraulic submersible pump which is suitable for high-temperature exploitation of thick oil in an oil field, has high reliability, long service life and high axial bearing capacity and is used for lifting oil at the bottom of a well during thermal exploitation of the oil field.
Disclosure of Invention
In view of the above, the invention provides a hydraulic submersible pump which is suitable for high-temperature exploitation of thick oil in an oil field, has high reliability, long service life and high axial bearing capacity and is used for lifting oil at the bottom of a well during thermal exploitation of the oil field.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic submersible pump for lifting downhole oil during thermal recovery in an oil field, comprising:
an oil outlet sleeve;
the steam inner pipe is nested at one end of the oil outlet sleeve, and an annular space between the oil outlet sleeve and the steam inner pipe is a first oil production flow passage;
the power liquid inner pipe is nested at one end of the steam inner pipe, an annular space between the steam inner pipe and the power liquid inner pipe is a steam inlet flow channel, a front side opening of the steam inlet flow channel is a steam inlet, one end of the power liquid inner pipe is a power liquid inlet, and power liquid is injected through the power liquid inlet at high pressure;
the turbine pump is nested at the other end of the steam inner pipe, one side end of a pump shell of the turbine pump is communicated with the other end of the power fluid inner pipe through a first pipe joint, an annular space among the turbine pump, the first pipe joint and the steam inner pipe is a first steam flow passage communicated with a rear side passage port of the steam inlet flow passage, and a power fluid backflow port communicated with the first steam flow passage is formed in the side wall of the other side of the pump shell of the turbine pump;
the centrifugal pump is arranged in the oil outlet sleeve, one side end of a pump shell of the centrifugal pump is connected with the other side end of the pump shell of the turbine pump through a first switch sliding sleeve connecting assembly, and a second steam flow channel communicated with the first steam flow channel is arranged on the first switch sliding sleeve connecting assembly;
the oil production circulation sleeve is sleeved outside the centrifugal pump, one end of the oil production circulation sleeve is sleeved on the first switch sliding sleeve connecting assembly, a space interlayer between the oil production circulation sleeve and the first switch sliding sleeve connecting assembly is a second oil production flow passage communicated with the first oil production flow passage, a space between the oil production circulation sleeve and the centrifugal pump is a third oil production flow passage, a first oil outlet hole communicated with the second oil production flow passage is formed in the wall of the oil production circulation sleeve, and a second oil outlet hole communicated with the third oil production flow passage is formed in the pump shell of the centrifugal pump;
the steam conveying pipeline is arranged in the oil recovery circulation sleeve, and one end of the steam conveying pipeline is communicated with the second steam flow channel;
the tail pipe is nested at the other end of the oil outlet sleeve, one end of the tail pipe is communicated with the other end of the pump shell of the centrifugal pump through a second switch sliding sleeve connecting assembly, a fourth oil extraction flow channel communicated with the tail pipe is arranged on the second switch sliding sleeve connecting assembly, and the other end of the steam delivery pipeline penetrates through the other end of the oil extraction flow sleeve to be communicated with a steam outlet on the pipe wall of the tail pipe;
wherein the turbine pump and the centrifugal pump share one power shaft.
According to the technical scheme, compared with the prior art, the invention discloses a hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery of an oil field, when oil (oil reservoir liquid) is recovered, high-temperature steam is conveyed underground to reduce the viscosity of the thick oil, so that the oil becomes thin and thick and is beneficial to pumping and lifting, specifically, the high-temperature steam enters a steam inlet flow channel, a first steam flow channel, a second steam flow channel and a steam conveying pipeline through a steam outlet and then enters a tail pipe, the high-temperature steam is introduced into the oil position under the well through the tail pipe, when the oil under the well becomes thin and thick, the steam injection is stopped, and after the soaking and self-spraying stages, the thick oil recovery is started; specifically, high-pressure power liquid enters the power liquid inner pipe through the power liquid inlet, the power liquid pushes a turbine in the turbine pump to rotate, the turbine drives a power shaft to rotate, the power shaft rotates to drive a pump wheel in the centrifugal pump to rotate to generate suction, underground oil is pumped to a tail pipe and flows through a fourth oil extraction oil flow channel, a second oil outlet hole, a third oil extraction oil flow channel, a first oil outlet hole, a second oil extraction oil flow channel and a first oil extraction oil flow channel to be lifted out of the well, the power liquid flows through the turbine and then flows back to the outside of the well through a power liquid return port, a first steam flow channel and a steam inlet flow channel, and the power liquid is continuously injected in a circulating mode, so that oil exploitation is achieved. The submersible pump of the invention uses power liquid as power of the turbine pump and the centrifugal pump, and is driven by a mechanical type instead of the existing motor, thereby saving electrical elements, having high reliability and long service life.
Furthermore, two ends of the power shaft are respectively arranged on a first dynamic pressure sliding centering bearing in the turbine pump and a second dynamic pressure sliding centering bearing in the centrifugal pump in a penetrating manner, the position of the power shaft close to the first dynamic pressure sliding centering bearing is arranged on a static pressure bearing in a penetrating manner, the first dynamic pressure sliding centering bearing and the static pressure bearing are respectively provided with a power liquid flow through hole, the static pressure bearing is internally provided with a power liquid flow passage, one end of the power liquid flow passage is a first power liquid inlet, the other end of the power liquid flow passage is a first power liquid outlet, the first power liquid outlet is communicated with the first steam flow passage, a turbine in the turbine pump is provided with a power liquid circulation passage, one end of the power liquid flow passage is a second power liquid inlet, the power liquid flow passage is arranged opposite to the first power liquid inlet, and the other end of the power liquid flow passage is a second power liquid outlet, and is communicated with the power liquid return opening.
Furthermore, a bearing base on the static pressure thrust bearing is fixedly connected with the pump shell of the turbine pump, two sides of the bearing base are fixedly pressed through a first compression ring, a static ring on the static pressure thrust bearing is fixed with the bearing base, two sides of a moving ring on the static pressure thrust bearing are respectively fixed with a shaft shoulder through a second compression ring and integrally rotate with the power shaft, and a flow passage in the bearing base, a flow passage in the static ring and a gap between the static ring and the moving ring are communicated to form the power fluid flow passage.
The submersible pump has the advantages that the hydrostatic thrust bearing is used, the pressure of the first power fluid inlet of the hydrostatic thrust bearing is communicated with the second power fluid inlet, namely the pressure of the power fluid inlet of the hydrostatic thrust bearing is equal to the pressure of the power fluid inlet of the turbine pump, the pressure of the first power fluid outlet is communicated with the second power fluid outlet, namely the pressure of the power fluid outlet of the hydrostatic thrust bearing is basically equal to the pressure of the power fluid outlet of the turbine pump, under the condition that the stress areas of the hydrostatic thrust bearing and the turbine are the same, the axial force borne by the hydrostatic thrust bearing can offset the axial force borne by the turbine, namely, the high-pressure power fluid enters the hydrostatic thrust bearing to provide a stable liquid film capable of bearing a larger load for the hydrostatic thrust bearing, the movable ring and the static ring of the hydrostatic thrust bearing are isolated, and therefore the action of offsetting the axial force generated, thereby increasing the axial load capacity of the pump.
Further, the first switch sleeve connection assembly includes:
one end of the second pipe joint is fixedly connected with the other end of the pump shell of the turbopump, a front-section steam flow passage is arranged in the second pipe joint, and one end of the front-section steam flow passage is communicated with the first steam flow passage;
one end of the first switch sliding sleeve is fixedly connected with the other end of the second pipe joint, a rear-section steam flow channel and a first sliding sleeve piston are arranged in the first switch sliding sleeve, one end of the rear-section steam flow channel is communicated with the other end of the front-section steam flow channel and forms the second steam flow channel, and after the first sliding sleeve piston is opened, the rear-section steam flow channel is communicated with one end of the steam conveying pipeline;
and one end of the third pipe joint is fixedly connected with the other end of the first switch sliding sleeve, and the other end of the third pipe joint is fixedly connected with one side end of the pump shell of the centrifugal pump.
Further, the second switch sleeve connection assembly includes:
one end of the fourth pipe joint is fixed and communicated with the other end of the centrifugal pump shell;
one end of the second switch sliding sleeve is fixed and communicated with the other end of the fourth pipe joint, a front-section produced oil flow passage and a second sliding sleeve piston are arranged in the second switch sliding sleeve, and after the second sliding sleeve piston is opened, one end of the front-section produced oil flow passage is communicated with the inside of the second switch sliding sleeve;
the fifth pipe joint, fifth pipe joint one end with second switch sliding sleeve other end fixed connection, set up middle section exploitation oil runner on the fifth pipe joint, middle section exploitation oil runner one end with the front section exploitation oil runner other end intercommunication, the fifth pipe joint other end set up with the back end exploitation oil runner of middle section exploitation oil runner other end intercommunication, the front section exploitation oil runner the middle section exploitation oil runner with constitute behind the back end exploitation oil runner three intercommunication the fourth exploitation oil runner, tail pipe one end with the fifth pipe joint other end is fixed and with the back end exploitation oil runner other end intercommunication.
Furthermore, a first balance drum is arranged between the other side of the pump shell of the turbine pump and one end of the second pipe joint, a second balance drum is arranged between the other end of the third pipe joint and one side of the pump shell of the centrifugal pump, and the first balance drum and the second balance drum are both fixedly sleeved on the power shaft.
The beneficial effect that adopts above-mentioned technical scheme to produce is that, the setting of first balance drum and second balance drum can offset 90% axial force of turbine and centrifugal pump, improves submersible pump's stability and reliability greatly.
Furthermore, a first mechanical seal is arranged between the inside of one end of the second pipe joint and the power shaft, and a second mechanical seal is arranged between the inside of the other end of the third pipe joint and the power shaft.
Furthermore, a packer is arranged at the position of the rear side of the first oil outlet hole in the second oil extraction flow channel.
The beneficial effect who adopts above-mentioned technical scheme to produce is, the setting of packer for oil can flow to first oil recovery oil flow channel, can not flow to in the pit after first oil outlet enters into second oil recovery oil flow channel.
Furthermore, a safety valve is arranged on the tail pipe.
The beneficial effect that adopts above-mentioned technical scheme to produce is that, after breaking down, the relief valve is closed, cuts off submersible pump and the intercommunication in the pit, improves the security.
Further, the power liquid is water.
The technical scheme has the advantages of easy acquisition and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery in an oil field according to the present invention.
Fig. 2 is an enlarged schematic view of a part a in fig. 1.
Fig. 3 is an enlarged schematic view of a part B in fig. 1.
Fig. 4 is an enlarged schematic view of a part C in fig. 1.
FIG. 5 is an enlarged view of the static thrust bearing portion.
FIG. 6 is a schematic diagram of the flow direction of a hydraulic submersible pump power fluid and production oil used for lifting bottom hole oil during thermal recovery in an oil field.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, an embodiment of the present invention discloses a hydraulic submersible pump for lifting bottom-hole oil during thermal recovery of an oil field, including:
an oil outlet sleeve 1;
the steam inner pipe 2 (4-1/2' oil pipe), the steam inner pipe 2 is nested at one end of the oil outlet sleeve 1, and the annular space between the oil outlet sleeve 1 and the steam inner pipe 2 is a first produced oil outlet flow passage 101;
the power liquid inner tube 3 (1.9' oil tube), the power liquid inner tube 3 nests in one end of the inner tube 2 of steam, the annular space between inner tube 2 of steam and inner tube 3 of power liquid is the steam entering runner 201, the front side mouth of the steam entering runner 201 is the steam inlet 202, one end of the inner tube 3 of power liquid is the inlet 301 of power liquid, the power liquid is injected by the inlet 301 of power liquid under high pressure;
the turbine pump 4 is nested at the other end of the steam inner tube 2, one side end of a pump shell of the turbine pump 4 is communicated with the other end of the power fluid inner tube 3 through a first pipe joint 5, an annular space among the turbine pump 4, the first pipe joint 5 and the steam inner tube 2 is a first steam flow channel 203 communicated with a rear side channel port of the steam inlet channel 201, and a power fluid return port 302 communicated with the first steam flow channel 203 is formed in the side wall of the other side of the pump shell of the turbine pump 4;
the centrifugal pump 6 is arranged in the oil outlet sleeve 1, one side end of a pump shell of the centrifugal pump 6 is connected with the other side end of the pump shell of the turbine pump 4 through a first switch sliding sleeve connecting assembly 7, and a second steam flow channel 204 communicated with the first steam flow channel 203 is arranged on the first switch sliding sleeve connecting assembly 7;
the oil recovery circulation sleeve 8 is sleeved outside the centrifugal pump 6, one end of the oil recovery circulation sleeve 8 is sleeved on the first switch sliding sleeve connecting assembly 7, a space interlayer between the oil outlet sleeve 1 and the oil recovery circulation sleeve 8 and between the first switch sliding sleeve connecting assembly 7 is a second oil recovery outlet flow passage 102 communicated with the first oil recovery outlet flow passage 101, a space between the oil recovery circulation sleeve 8 and the centrifugal pump 6 is a third oil recovery outlet flow passage 103, a first oil outlet hole 801 communicated with the second oil recovery outlet flow passage 102 is formed in the wall of the oil recovery circulation sleeve 8, and a second oil outlet hole 601 communicated with the third oil recovery outlet flow passage 103 is formed in the pump shell of the centrifugal pump 6;
the steam conveying pipeline 9 is arranged in the oil recovery circulation sleeve 8, and one end of the steam conveying pipeline 9 is communicated with the second steam flow channel 204;
a tail pipe 10, the tail pipe 10 is nested at the other end of the oil outlet sleeve 1, one end of the tail pipe 10 is communicated with the other end of the pump shell of the centrifugal pump 6 through a second switch sliding sleeve connecting assembly 11, a fourth oil outlet flow passage 104 communicated with the tail pipe 10 is arranged on the second switch sliding sleeve connecting assembly 11, and the other end of the steam delivery pipeline 9 passes through the other end of the oil outlet flow sleeve 8 to be communicated with a steam outlet 205 on the pipe wall of the tail pipe 10;
wherein, the turbo pump 4 and the centrifugal pump 6 share one power shaft 12.
Two ends of a power shaft 12 are respectively arranged on a first dynamic pressure sliding centering bearing 13 in the turbo pump 4 and a second dynamic pressure sliding centering bearing 14 in the centrifugal pump 6 in a penetrating manner, the position of the power shaft 12 close to the first dynamic pressure sliding centering bearing 13 is arranged on a static pressure bearing 15 in a penetrating manner, the first dynamic pressure sliding centering bearing 13 and the static pressure bearing 15 are respectively provided with a power liquid flow through hole 303, a power liquid flow channel 304 is arranged in the static pressure bearing 15, one end of the power liquid flow channel 304 is a first power liquid inlet 3041, the other end is a first power liquid outlet 3042, the first power liquid outlet 3042 is communicated with a first steam flow channel 203, a turbine in the turbo pump 4 is provided with a power liquid flowing channel 305, one end of the power liquid flowing channel 305 is a second power liquid inlet 3051, and is disposed opposite to the first power fluid inlet 3041, and the other end is a second power fluid outlet 3052 and is communicated with the power fluid return port 302.
The first switch sliding sleeve connecting assembly 7 includes:
one end of the second pipe joint 71 is fixedly connected with the other end of the pump shell of the turbopump 4, a front section steam flow passage 2041 is arranged in the second pipe joint 71, and one end of the front section steam flow passage 2041 is communicated with the first steam flow passage 203;
the first switch sliding sleeve 72, one end of the first switch sliding sleeve 72 is fixedly connected with the other end of the second pipe joint 71, a rear-section steam flow passage 2042 and a first sliding sleeve piston 721 are arranged in the first switch sliding sleeve 72, one end of the rear-section steam flow passage 2042 is communicated with the other end of the front-section steam flow passage 2041 and forms a second steam flow passage 204, and after the first sliding sleeve piston 721 is opened, the rear-section steam flow passage 2042 is communicated with one end of the steam conveying pipeline 9;
and one end of the third pipe joint 73 is fixedly connected with the other end of the first switch sliding sleeve 72, and the other end of the third pipe joint 73 is fixedly connected with one side end of the pump shell of the centrifugal pump 6.
The second switch sliding sleeve coupling assembly 11 includes:
one end of the fourth pipe joint 111 is fixed and communicated with the other end of the pump shell of the centrifugal pump 6;
a second switch sliding sleeve 112, wherein one end of the second switch sliding sleeve 112 is fixed and communicated with the other end of the fourth pipe joint 111, a front-stage produced oil flow passage 1041 and a second sliding sleeve piston 1121 are arranged in the second switch sliding sleeve 112, and after the second sliding sleeve piston 1121 is opened, one end of the front-stage produced oil flow passage 1041 is communicated with the inside of the second switch sliding sleeve 112;
a fifth pipe joint 113, one end of the fifth pipe joint 113 is fixedly connected with the other end of the second switch sliding sleeve 112, a middle-stage produced oil flow passage 1042 is arranged on the fifth pipe joint 113, one end of the middle-stage produced oil flow passage 1042 is communicated with the other end of the front-stage produced oil flow passage 1041, the other end of the fifth pipe joint 113 is provided with a rear-stage produced oil flow passage 1043 communicated with the other end of the middle-stage produced oil flow passage 1042, the front-stage produced oil flow passage 1041, the middle-stage produced oil flow passage 1042 and the rear-stage produced oil flow passage 1043 are communicated to form a fourth produced oil flow passage 104, one end of the tail pipe 10 is fixed with the other end of the fifth pipe joint 113.
A first balance drum 16 is arranged between the other side of the pump shell of the turbo pump 4 and one end of a second pipe joint 71, a second balance drum 17 is arranged between the other end of a third pipe joint 73 and one side of the pump shell of the centrifugal pump 6, and the first balance drum 16 and the second balance drum 17 are both fixedly sleeved on the power shaft 12.
A first mechanical seal 18 is arranged between the inner part of one end of the second pipe joint 71 and the power shaft 12, and a second mechanical seal 19 is arranged between the inner part of the other end of the third pipe joint 73 and the power shaft 12.
A packer 20 is disposed in the second production line flow path 102 at a location rearward of the first outlet port 801.
The tail pipe 10 is provided with a safety valve 21.
The power fluid in the invention can be water or lubricating oil or other fluid.
The hydraulic submersible pump can be used for exploiting offshore oil fields, and the working process is as follows:
firstly, when an offshore oil field is exploited, because underground heavy oil (oil liquid of an oil reservoir) has high consistency and poor fluidity, normal pumping cannot be performed, and therefore high-temperature steam is required to dilute oil reservoir liquid. The high temperature steam injection process is as follows (see black arrows in fig. 1): the first switch sliding sleeve is opened, high-temperature steam enters the steam inlet flow channel through the steam inlet, enters the tail pipe through the steam outlet after passing through the first steam flow channel, the front-section steam flow channel, the rear-section steam flow channel and the steam delivery pipeline, is introduced into oil of the oil reservoir at the bottom of the well through the tail pipe, and stops steam injection after the oil of the oil reservoir at the bottom of the well becomes thin and thick.
Secondly, the process of lifting the oil at the bottom of the well is as follows: and a second sliding sleeve piston of the second switch sliding sleeve is opened, high-pressure power liquid enters the power liquid inner pipe through a ground pump, the power liquid pushes a turbine in the turbine pump to rotate, the turbine drives a power shaft to rotate, the power shaft rotates to drive a pump wheel in the centrifugal pump to rotate to generate suction, oil liquid in a bottom oil reservoir is sucked to a tail pipe and is lifted to a ground oil storage tank (see black arrows in figure 6) through a fourth oil extraction flow channel, a second oil outlet hole, a third oil extraction flow channel, a first oil outlet hole, a second oil extraction flow channel and a first oil extraction flow channel, and the power liquid flows back to the ground pump (see white arrows in figure 6) through a power liquid return port, a first steam flow channel and a steam inlet flow channel after passing through the turbine, and the power liquid is continuously and circularly injected, so that the exploitation of the oil reservoir liquid is realized.
The submersible pump of the invention takes power liquid as power of the turbine pump and the centrifugal pump, and is driven by a mechanical type instead of the existing motor, thereby saving electrical components, having high reliability and long service life; and the static thrust bearing is used, so that the axial bearing capacity of the submersible pump is greatly improved; meanwhile, the submersible pump can realize the integration of injection and production of offshore heavy oil production, and uses power fluid as lubricating fluid of the bearing, thereby overcoming the defect that the electric submersible pump, other types of bearings and lubricating oil are not high-temperature resistant, and the submersible pump does not need to be pulled out from the underground for steam injection and well stewing, thereby saving the production cost and the production process; the power fluid and the oil reservoir fluid respectively form a set of circulating pipelines, the power fluid and the oil reservoir fluid are not influenced mutually, the power fluid returns to the ground and enters a ground pump for recycling after being filtered, and the oil reservoir fluid enters an oil storage tank for storage.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery in an oil field, comprising:
an oil outlet sleeve (1);
the steam inner pipe (2) is nested at one end of the oil outlet sleeve (1), and an annular space between the oil outlet sleeve (1) and the steam inner pipe (2) is a first oil production flow channel (101);
the power liquid inner pipe (3) is nested at one end of the steam inner pipe (2), an annular space between the steam inner pipe (2) and the power liquid inner pipe (3) is a steam inlet flow channel (201), a front side opening of the steam inlet flow channel (201) is a steam inlet (202), one end of the power liquid inner pipe (3) is a power liquid inlet (301), and power liquid is injected at high pressure through the power liquid inlet (301);
the turbine pump (4) is nested at the other end of the steam inner pipe (2), one side end of a pump shell of the turbine pump (4) is communicated with the other end of the power fluid inner pipe (3) through a first pipe joint (5), an annular space between the turbine pump (4), the first pipe joint (5) and the steam inner pipe (2) is a first steam flow channel (203) communicated with a rear side channel opening of the steam inlet flow channel (201), and a power fluid return opening (302) communicated with the first steam flow channel (203) is formed in the side wall of the other side of the pump shell of the turbine pump (4);
the centrifugal pump (6) is arranged inside the oil outlet sleeve (1), one side end of a pump shell of the centrifugal pump (6) is connected with the other side end of the pump shell of the turbine pump (4) through a first switch sliding sleeve connecting assembly (7), and a second steam flow channel (204) communicated with the first steam flow channel (203) is arranged on the first switch sliding sleeve connecting assembly (7);
the oil recovery circulation sleeve (8) is sleeved outside the centrifugal pump (6), one end of the oil recovery circulation sleeve (8) is sleeved on the first switch sliding sleeve connecting component (7), the annular space between the oil outlet sleeve (1) and the oil production circulation sleeve (8) and between the first switch sliding sleeve connecting assembly (7) is a second oil production flow passage (102) communicated with the first oil production flow passage (101), the space between the oil recovery flow sleeve (8) and the centrifugal pump (6) is a third oil recovery flow passage (103), a first oil outlet hole (801) communicated with the second oil production flow passage (102) is formed in the wall of the oil production circulation sleeve (8), a second oil outlet hole (601) communicated with the third produced oil outlet flow channel (103) is formed in the pump shell of the centrifugal pump (6);
the steam conveying pipeline (9) is arranged in the oil recovery circulation sleeve (8), and one end of the steam conveying pipeline (9) is communicated with the second steam flow channel (204);
the tail pipe (10) is nested at the other end of the oil outlet sleeve (1), one end of the tail pipe (10) is communicated with the other side end of the pump shell of the centrifugal pump (6) through a second switch sliding sleeve connecting assembly (11), a fourth oil outlet flow channel (104) communicated with the tail pipe (10) is arranged on the second switch sliding sleeve connecting assembly (11), and the other end of the steam delivery pipeline (9) penetrates through the other end of the oil outlet flow sleeve (8) to be communicated with a steam outlet (205) in the pipe wall of the tail pipe (10);
wherein the turbine pump (4) and the centrifugal pump (6) share one power shaft (12).
2. The hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery of an oil field according to claim 1, wherein two ends of the power shaft (12) are respectively arranged on a first dynamic pressure sliding centering bearing (13) in the turbine pump (4) and a second dynamic pressure sliding centering bearing (14) in the centrifugal pump (6) in a penetrating manner, the position of the power shaft (12) close to the first dynamic pressure sliding centering bearing (13) is arranged on a static pressure bearing (15) in a penetrating manner, the first dynamic pressure sliding centering bearing (13) and the static pressure bearing (15) are respectively provided with a power liquid flow through hole (303), the static pressure bearing (15) is internally provided with a power liquid flow passage (304), one end of the power liquid flow passage (304) is a first power liquid inlet (3041), the other end of the power liquid flow passage is a first power liquid outlet (3042), and the first power liquid outlet (3042) is communicated with the first steam flow passage (203), a turbine in the turbopump (4) is provided with a power liquid flowing channel (305), one end of the power liquid flowing channel (305) is provided with a second power liquid inlet (3051) which is opposite to the first power liquid inlet (3041), and the other end of the power liquid flowing channel is provided with a second power liquid outlet (3052) which is communicated with the power liquid return port (302).
3. The hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery of an oil field according to claim 2, wherein a bearing base (151) on the static thrust bearing (15) is fixedly connected with a pump shell of the turbine pump (4), two sides of the bearing base (151) are fixedly pressed by a first pressing ring (152), a static ring (153) on the static thrust bearing (15) is fixed with the bearing base (151), two sides of a dynamic ring (154) on the static thrust bearing (15) are respectively fixed by a second pressing ring (155) and a shaft shoulder and rotate integrally with the power shaft (12), and a flow passage in the bearing base (151), a flow passage in the static ring (153) and a gap between the static ring (153) and the dynamic ring (154) are communicated to form the power fluid flow passage (304).
4. The hydraulic submersible pump for lifting downhole oil during thermal recovery in oil fields according to claim 1, wherein the first sliding sleeve connection assembly (7) comprises:
one end of the second pipe joint (71) is fixedly connected with the other end of the pump shell of the turbine pump (4), a front-section steam flow channel (2041) is arranged in the second pipe joint (71), and one end of the front-section steam flow channel (2041) is communicated with the first steam flow channel (203);
one end of the first switch sliding sleeve (72) is fixedly connected with the other end of the second pipe joint (71), a rear-section steam flow channel (2042) and a first sliding sleeve piston (721) are arranged in the first switch sliding sleeve (72), one end of the rear-section steam flow channel (2042) is communicated with the other end of the front-section steam flow channel (2041) to form the second steam flow channel (204), and after the first sliding sleeve piston (721) is opened, the rear-section steam flow channel (2042) is communicated with one end of the steam conveying pipeline (9);
one end of the third pipe joint (73) is fixedly connected with the other end of the first switch sliding sleeve (72), and the other end of the third pipe joint (73) is fixedly connected with one side end of a pump shell of the centrifugal pump (6).
5. The hydraulic submersible pump for lifting downhole oil during thermal recovery in oil fields according to claim 1, wherein the second switch sleeve connection assembly (11) comprises:
one end of the fourth pipe joint (111) is fixed and communicated with the other end of the pump shell of the centrifugal pump (6);
a second switch sliding sleeve (112), wherein one end of the second switch sliding sleeve (112) is fixed and communicated with the other end of the fourth pipe joint (111), a front-stage produced oil flow passage (1041) and a second sliding sleeve piston (1121) are arranged in the second switch sliding sleeve (112), and after the second sliding sleeve piston (1121) is opened, one end of the front-stage produced oil flow passage (1041) is communicated with the inside of the second switch sliding sleeve (112);
one end of the fifth pipe joint (113) is fixedly connected with the other end of the second switch sliding sleeve (112), a middle-section produced oil flow passage (1042) is formed in the fifth pipe joint (113), one end of the middle-section produced oil flow passage (1042) is communicated with the other end of the front-section produced oil flow passage (1041), the other end of the fifth pipe joint (113) is provided with a rear-section produced oil flow passage (1043) communicated with the other end of the middle-section produced oil flow passage (1042), the front-section produced oil flow passage (1041), the middle-section produced oil flow passage (1042) and the rear-section produced oil flow passage (1043) are communicated to form the fourth-section produced oil flow passage (104), and one end of the tail pipe (10) is fixed with the other end of the fifth pipe joint (113) and is communicated with the other end of the rear-section produced oil flow passage (1043).
6. The hydraulic submersible pump for lifting oil at the bottom of a well during thermal recovery of an oil field is characterized in that a first balance drum (16) is arranged between the other side of the pump shell of the turbine pump (4) and one end of the second pipe joint (71), a second balance drum (17) is arranged between the other end of the third pipe joint (73) and one side of the pump shell of the centrifugal pump (6), and the first balance drum (16) and the second balance drum (17) are both fixedly sleeved on the power shaft (12).
7. The hydraulic submersible pump for lifting downhole oil during thermal recovery in oil fields according to claim 4, wherein a first mechanical seal (18) is arranged between the inside of one end of the second pipe joint (71) and the power shaft (12), and a second mechanical seal (19) is arranged between the inside of the other end of the third pipe joint (73) and the power shaft (12).
8. The hydraulic submersible pump for lifting downhole oil during thermal recovery in an oil field of claim 1, wherein a packer (20) is disposed in the second production flow path (102) at a location rearward of the first production port (801).
9. Hydraulic submersible pump for lifting fluids downhole in the thermal recovery of oil fields according to any of claims 1-8, characterized in that the tail pipe (10) is provided with a safety valve (21).
10. The hydraulic submersible pump for lifting bottom hole oil during thermal recovery of oil field according to any of claims 1-8, wherein the power fluid is water.
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Cited By (1)
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