CN1560476A - Oil production system with electric oil-submersible dule screw rod pump - Google Patents
Oil production system with electric oil-submersible dule screw rod pump Download PDFInfo
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- CN1560476A CN1560476A CNA2004100045117A CN200410004511A CN1560476A CN 1560476 A CN1560476 A CN 1560476A CN A2004100045117 A CNA2004100045117 A CN A2004100045117A CN 200410004511 A CN200410004511 A CN 200410004511A CN 1560476 A CN1560476 A CN 1560476A
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- screw
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- oil production
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention is a electric oil dual-screw pump flow system, pointing to the problem that the occupied area is large, the efficiency is low in current mechanical flow system, it includes a silo machine group part with a dynamic power machine group, the silo machine group part includes at least a pressure segment and at least a flow segment, the pressure and the flow segment are connected in series, the entrance channel of the pressure segment and the output channel of the flow segment are connected; the pressure segment and the flow segment include at least one dual-screw pump component with a entrance channel and a output channel. The pump component in the above mentioned structure belongs to volume pump, thus the transmitted flow has nothing to do with the density of the transmitted flow, at the same time, and the pressure upgrading value of the volume pump has nothing to do with the transmitted flow.
Description
Technical field
The present invention relates to a kind of oilfield down-hole discharge opeing oil production system, particularly a kind of oilfield down-hole discharge opeing oil recovery two screw pump oil production system.
Background technique
The interior application of world wide at present three kinds of main mechanical oil production systems the most widely is that " pumping unit-sucker rod-oil well pump " formula has rod recovering system, electric submersible centrifugal pump (ESP) oil production system, helical rotor pump (PCP) oil production system, but these three kinds of mechanical oil production systems all exist some shortcomings.
Characteristics such as work is more reliable, easy to operate though oil production system has " pumping unit-sucker rod-oil well pump ", pressure discharge capacity regulation range wide, the easily damaged parts life-span is long, its shortcoming is also apparent in view: (1) floor space is big, and it is many to expend steel; (2) be difficult to adapt to clump formula inclined shaft, horizontal well production; (3) be difficult to adapt to high viscosity viscous crude and oil, solid phase mixing is oily; (4) waste energy, reduced the overall economic benefit of oil-gas field development; (5) complex structure, easily damaged parts are many, and maintenance load is big.
The electric submersible centrifugal pump oil production system from the shaft bottom and on fundamental composition be followed successively by " oil-submersible motor-protector-multistage centrifugal pump assembly ", provide electric energy by power cable being extended to the shaft bottom to oil-submersible motor, and then drive the rotation of centrifugal pump assembly.Although it has overcome the remarkable shortcoming of " pumping unit-sucker rod-oil well pump " oil production system,, make the following well depth of this system be restricted on the one hand because of centrifugal lift of pump and discharge capacity and its rotating speed have much relations; Have to adopt multistage centrifugal pump or adopt the speedup measure for increasing discharge capacity on the other hand,, thereby make structure complicated because the restriction of cavitation conditions makes that its rotating speed can not unrestricted increase.In addition, the level of cavitation of impeller and guide wheel will increase the weight of in the centrifugal pump when air content is higher in the crude oil, and when sand content is higher in the crude oil in the centrifugal pump wearing and tearing of impeller and guide wheel accelerate rapidly, operating life sharply shortens, thereby has limited the application area of electric submersible centrifugal pump oil production system to a certain extent.
Divide according to the driving mode to helical rotor pump, single-screw pump oil production system can be divided into three kinds of forms such as ground machine drives, the electric driving of underground hydraulic pressure driving and down-hole, and wherein the former uses wider at present.For ground machine drives helical rotor pump (RDPCP) oil production system, though helical rotor pump more can adapt to high viscosity viscous crude and oily, the oily operating mode of solid phase mixing than reciprocating oil-well pump, and medium is mobile by axially evenly carrying out, and inner flow velocity is lower, and volume also can remain unchanged.But this working method also exists some common shortcomings of " pumping unit-sucker rod-oil well pump " oil production system, and because its internal flow one-way flow, and whole system self can not transient equiliblium; Also there is the sucker rod reversal phenomenon that produces because of blowback stream during termination of pumping, even can causes the catastrophic failure of ground surface driving; In addition, be interference fit between the stator of helical rotor pump and the rotor, starting torque is bigger.
In order to overcome the shortcoming that ground machine drives single-screw pump oil production system, represent the Baker Hughes centrilift of world's mechanical oil recovery equip ment highest level, Schlumberger Reda Pumps company to release the electric submersible single screw pump oil production system in the mid-early stage nineties 20th century.Except needs overcome principal contradictions such as the planetary motion of the huge axial force that produces in the screw pump working procedure, screw rotor and the rotation of input device dead axle; also there is the mismatch problem between the high speed owing to oil-submersible motor, little moment of torsion output characteristics and oil recovery helical rotor pump low speed, the high pulling torque input characteristics; must between the two, increase speed reducer for this reason, thus this system from the shaft bottom and on fundamental composition generally be followed successively by " oil-submersible motor-protector-speed reducer-helical rotor pump ".On-the-spot producibility is not used because the restriction of factors such as domestic speed reducer design, manufacturing technology level, this technology obtain recovering the oil so far at home as yet.Simultaneously objective, also there are some shortcomings in single-screw pump oil production system itself, for example: (1) will soon make elastomer stator lose efficacy when sand content higher and abrasive particle in down-hole is strong, and the aromatic substance in some well liquid can cause stator rubber swelling degraded; Cross oil pipe when wire rope and remove single-screw pump oil production system technology (TTC technology) when not promoting the use of as yet, consuming time longer because replacing or repairing down-hole helical rotor pump need use well repairing machine that whole oil pipes are tripped out.
In view of the foregoing, be necessary further to develop the deficiency that novel down-hole mechanical oil production system overcomes above-mentioned main mechanical oil production model.
Summary of the invention
At the problem that exists in the existing machinery oil recovery technique, patent of the present invention proposed a kind of have occupation area of equipment little, do not have the wearing and tearing of pipe bar, system effectiveness height, a safe and reliable electric submersible twin-screw pump oil production system.
In order to achieve the above object, electric submersible twin-screw pump oil production system of the present invention, comprise the down-hole unit part that has the power unit, it is characterized in that: described down-hole unit partly comprises at least one pressure stage and at least one flow section, described pressure stage and flow section are connected mutually, and promptly the inlet passage of pressure stage is connected with the outlet passage of flow section; Described pressure stage and flow section comprise that at least one has the two screw pump assembly of inlet passage, outlet passage.
Two screw pump belongs to positive displacement pump in the electric submersible twin-screw pump oil production system of the present invention, and the flow that positive displacement pump is carried and the density of conveyance fluid are irrelevant, and only are the functions of pump structure size and rotating speed; The pressure lift-off value of positive displacement pump is irrelevant with the flow of being carried simultaneously.Therefore, no matter how to change or how low be transferred the density of fluid at pump suction place gas volume fraction, do not need to change the rotating speed of pump to obtain constant supercharging value as vane type oil pump, and the rotor of two screw pump can be worked under high rotating speed and needn't be used speed reducer, so structure is comparatively compact.And the present invention can adopt the down-hole oil-submersible motor directly to drive, and improved mechanical efficiency greatly.
Description of drawings
Fig. 1 is an electric submersible twin-screw pump oil production system underwell pump assembly layout schematic representation.
Fig. 2 is the structural representation of individual module in the two screw pump assembly.
Fig. 3 is that the A-A of electrical submersible twin-screw oil production system shown in Figure 2 is to cross-sectional schematic.
Fig. 4 is that the B-B of electrical submersible twin-screw oil production system shown in Figure 2 is to cross-sectional schematic.
Fig. 5 is that the C-C of electrical submersible twin-screw oil production system shown in Figure 2 is to cross-sectional schematic.
Embodiment
The present invention can implement with reference to the accompanying drawings, is described in further detail below in conjunction with accompanying drawing:
Electric submersible twin-screw pump oil production system of the present invention, comprise the down-hole unit part that has the power unit, it is characterized in that: described down-hole unit partly comprises at least one pressure stage 1 and at least one flow section 2, described pressure stage 1 and flow section 2 are connected mutually, the inlet passage that is pressure stage 1 is connected with the outlet passage of flow section 2, and described pressure stage 1 and flow section 2 comprise that at least one has the two screw pump assembly 3 of inlet passage, outlet passage.Because of two screw pump in the electric submersible twin-screw pump oil production system of the present invention belongs to positive displacement pump, the flow that positive displacement pump is carried and the density of conveyance fluid are irrelevant, and only are the functions of pump structure size and rotating speed; The pressure lift-off value of positive displacement pump is irrelevant with the flow of being carried simultaneously.Therefore, no matter how to change or how low be transferred the density of fluid at pump suction place gas volume fraction, do not need to change the rotating speed of pump to obtain constant supercharging value as vane type oil pump, and the rotor of two screw pump can be worked under high rotating speed and needn't be used speed reducer, so structure is comparatively compact.And the present invention can adopt the down-hole oil-submersible motor directly to drive, and improved mechanical efficiency greatly,
In order to provide two screw pump required flow, described flow section pump assembly 3 adopts parallel way to link, and number is generally 1-3, and the outlet passage of 3 pump assemblies is connected among the figure; Be that each pump assembly all has a relatively independent suction port 16, even wherein any one suction port obstacle occurs or blocks the working state that also can not influence other suction port.Suction port from bottom to top is first order suction port 16a, second level suction port 16b, third level suction port 16c successively; Corresponding therewith on each flow module have inlet channel 17, an outlet passage 18.
In order to provide two screw pump required pressure, what link to each other on flow section top is the pressure stage of two screw pump, and described pressure stage pump assembly is 3, and the inlet passage of described 3 pump assemblies is connected and outlet passage is connected.A plurality of pressure stages can be connected mutually according to predetermined pressure head, the outlet passage of promptly adjacent two pressure stages is connected with inlet passage.
Two screw pump assembly of the present invention comprises and has inlet passage 26, the pump housing 21 of outlet passage 27, in the described pump housing 21, there are two rotation directions opposite (if the former is dextrorotation, then the latter is left-handed), be meshing with each other, non-touching screw rotor 22, described active screw rotor stretches out that the pump housing is outer and is connected with the power unit (be two active screw rods changeed be connected) when two adjacent pump assemblies are connected, described two screw rotors, 22 same ends are equipped with intermeshing synchromesh gear 20, initiatively screw rotor 22a passes to driven screw rotor 22b by gear 20 with half of output torque, the outer round surface of the internal surface of the described pump housing 21 and two screw rotors 22 is suitable, gap between the pump housing 21 and screw rotor 22 outer round surface and screw rotor 22 and the screw rotor 22 should be as much as possible little, so that the screw rotor 22 and the pump housing 21, form the sealed chamber that carries liquid between screw rotor 22 and the screw rotor 22 mutually.Each module all adopts external rolling bearing 25, by spiral labyrinch seal 23, metal end face seal 24 synchromesh gear 20/ rolling bearing 25 of power intake, the rolling bearing 25 of clutch end and the flowing medium of pump housing inner cavity chamber is separated.
As a further improvement on the present invention, described every screw rotor 22 is provided with two sections screw threads that rotation direction is opposite.Like this can so that the axial force of each module eliminate voluntarily; And then need not consider the axial force problem of whole downhole double screw pump assembly.Certainly also can only be provided with one section screw thread on every screw rotor 22, this moment, whole system need be provided with special axial force thrust joint.In order to make the better effects if of turnover oil, inlet passage 26 is positioned at the position at the pump housing 21 middle parts, and described outlet passage 27 is positioned at the position at the pump housing 21 nearly two ends.
Claims (7)
1, a kind of electric submersible twin-screw pump oil production system, comprise the down-hole unit part that has the power unit, it is characterized in that: described down-hole unit partly comprises at least one pressure stage and at least one flow section, described pressure stage and flow section are connected mutually, and promptly the inlet passage of pressure stage is connected with the outlet passage of flow section; Described pressure stage and flow section comprise that at least one has the two screw pump assembly of inlet passage, outlet passage.
2, two screw pump as claimed in claim 1 is characterized in that: the parallel connection of described flow section pump assembly, number in parallel are generally 1-3, and the outlet passage of each pump assembly is connected.
3, electric submersible twin-screw pump oil production system as claimed in claim 1 is characterized in that: described pressure stage pump assembly is 3, and the inlet passage of described 3 pump assemblies is connected and outlet passage is connected.
4, electric submersible twin-screw pump oil production system as claimed in claim 1 is characterized in that: according to the difference of lift that system requires, and the pressure stage of the different numbers of can connecting.
5, electric submersible twin-screw pump oil production system as claimed in claim 1, it is characterized in that: comprise in the pump housing of described two screw pump assembly that rotation direction is opposite, be meshing with each other, non-touching active screw rotor and driven screw rotor, described active screw rotor stretches out outside the pump housing and is connected with the power unit, described two same ends of screw rotor are equipped with pitch wheel, and the outer round surface of the internal surface of the described pump housing and two screw rods is suitable.
6, two screw pump as claimed in claim 2 is characterized in that: described every screw rotor is provided with two sections screw threads that rotation direction is opposite.
7, two screw pump as claimed in claim 2 is characterized in that: also can only be provided with one section screw thread on the every screw rotor 22, this moment, whole system need be provided with special axial force thrust joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100045117A CN1560476A (en) | 2004-02-19 | 2004-02-19 | Oil production system with electric oil-submersible dule screw rod pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100045117A CN1560476A (en) | 2004-02-19 | 2004-02-19 | Oil production system with electric oil-submersible dule screw rod pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1560476A true CN1560476A (en) | 2005-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100045117A Pending CN1560476A (en) | 2004-02-19 | 2004-02-19 | Oil production system with electric oil-submersible dule screw rod pump |
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| CN (1) | CN1560476A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2216501A1 (en) * | 2009-02-10 | 2010-08-11 | BP Exploration Operating Company Limited | Pump |
| CN102182680A (en) * | 2011-06-02 | 2011-09-14 | 重庆大学 | Multi-stage speed changing screw pump |
| CN108869273A (en) * | 2018-09-04 | 2018-11-23 | 扬州大学 | Reciprocating rotation screw pump based on the driving of sucker rod pumping bar |
| CN109681424A (en) * | 2018-11-21 | 2019-04-26 | 大连华科机械有限公司 | Multistage-combination gear oil-well pump |
| CN110494625A (en) * | 2017-04-07 | 2019-11-22 | 齐立富控股有限公司 | The modularization labyrinth sealing system that can be used together with electric submersible pump |
-
2004
- 2004-02-19 CN CNA2004100045117A patent/CN1560476A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2216501A1 (en) * | 2009-02-10 | 2010-08-11 | BP Exploration Operating Company Limited | Pump |
| WO2010092320A1 (en) * | 2009-02-10 | 2010-08-19 | Bp Exploration Operating Company Limited | Pump |
| US8985975B2 (en) | 2009-02-10 | 2015-03-24 | Bp Exploration Operating Company Limited | Multistage pump suitable for use in wells |
| CN102182680A (en) * | 2011-06-02 | 2011-09-14 | 重庆大学 | Multi-stage speed changing screw pump |
| CN110494625A (en) * | 2017-04-07 | 2019-11-22 | 齐立富控股有限公司 | The modularization labyrinth sealing system that can be used together with electric submersible pump |
| CN108869273A (en) * | 2018-09-04 | 2018-11-23 | 扬州大学 | Reciprocating rotation screw pump based on the driving of sucker rod pumping bar |
| CN108869273B (en) * | 2018-09-04 | 2024-02-27 | 扬州大学 | Reciprocating rotary screw pump driven by sucker rod with rod |
| CN109681424A (en) * | 2018-11-21 | 2019-04-26 | 大连华科机械有限公司 | Multistage-combination gear oil-well pump |
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