CN114427530A - Device and method for reducing back pressure in cooperative work with mechanical oil production well - Google Patents
Device and method for reducing back pressure in cooperative work with mechanical oil production well Download PDFInfo
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- CN114427530A CN114427530A CN202011005160.7A CN202011005160A CN114427530A CN 114427530 A CN114427530 A CN 114427530A CN 202011005160 A CN202011005160 A CN 202011005160A CN 114427530 A CN114427530 A CN 114427530A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 239000003129 oil well Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 241000191291 Abies alba Species 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims description 24
- 230000005484 gravity Effects 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 10
- 239000003921 oil Substances 0.000 description 43
- 241001023788 Cyttus traversi Species 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013475 authorization Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
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- 230000001960 triggered effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003466 welding 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
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
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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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
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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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
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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
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/28—Safety arrangements; Monitoring
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention discloses a device and a method for reducing back pressure by cooperating with a mechanical oil production well, wherein the device comprises a cam rotor pump, a motor and a differential pressure switch; the cam rotor pump is arranged on the Christmas tree produced liquid output pipeline, namely, the inlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through the inlet end pipeline of the cam pump, and the outlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through the outlet end pipeline of the cam pump; the power output end of the motor is connected with the power input end of the cam rotor pump; the pressure difference switch is a water pipe type pressure difference switch and is connected to the pipeline at the inlet end of the cam rotor pump. The cam pump is characterized by further comprising a bypass pipeline, the initial end of the bypass pipeline is connected with the outlet end pipeline of the cam pump, and the tail end of the bypass pipeline is connected with the inlet end pipeline of the cam pump. And a check valve is arranged on the bypass pipeline. The invention can reliably and safely pump and pressurize the produced fluid produced from the oil well, thereby reducing the back pressure of the oil well and the burden of an oil extraction system of the oil well.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering in the petroleum industry, in particular to a device and a method for reducing back pressure by cooperating with a mechanical oil production well.
Background
In the mechanical oil production of oil wells at home and abroad, oil is produced mainly in the modes of an oil pumping machine well, an electric submersible pump well, a screw pump well, a hydraulic jet pump well, a hydraulic piston pump well and the like, the pressure of the produced liquid of the oil well, which is lifted to the position of a well head from the well bottom, is called as oil pressure, and the produced liquid of the oil well takes the oil pressure as power and flows to an oil collecting station along a ground pipeline. In order to control the oil well output, a wellhead is provided with an oil nozzle, the pressure of the produced liquid before passing through the oil nozzle is oil pressure, and the pressure behind the oil nozzle is back pressure. The magnitude of the back pressure is related to the length of a pipeline from a wellhead to an oil gathering station, the pipe diameter, the amount of other well liquid which flows in, the height difference, the viscosity of crude oil and the like. If the oil well is not provided with an oil nozzle, the oil pressure and the back pressure are equal.
The oil pressure is also high when the oil well back pressure is high, and the oil pressure is low when the back pressure is low. The back pressure has obvious influence on the working condition of the oil well oil extraction system, the increase of the back pressure causes the load of the underground pump to be increased, the energy consumption of the mechanical oil extraction system is increased, the yield is reduced, and the service life is shortened. The back pressure of the oil well is reduced, the energy consumption of an oil extraction system is reduced, the yield of the oil well is improved, and the service life of the oil extraction system is prolonged.
The technology for reducing the back pressure of the oil well is provided, and a technology for pressurizing by using a water conservancy jet pump is provided by using a novel patent of a device for reducing the back pressure of the oil well, namely an authorization notice No. CN 208330297U. The invention also discloses a technology for utilizing the hydraulic cylinder to pressurize, as patent of invention, namely a hydraulic automatic pressure reducing device, with an authorization publication number of CN 205225218U. If the utility model discloses a patent "an oil well falls back pressure equipment", application number CN201510656129.2 again utilizes a two horse head beam-pumping units, and its first horse head is used for driving the pumping rod drive oil-well pump oil recovery in the pit, and the second horse head is used for driving the ground pump and gives the crude oil pressure boost of producing the well head. The technology for reducing the back pressure of the oil well does not relate to the problem of cooperative work with the mechanical oil production well, and the first is that when the mechanical oil production system stops working, the back pressure reducing device cannot stop working synchronously, and if the mechanical oil production system continues working, the risk of damage of the back pressure reducing device of the oil well due to lack of liquid exists. And secondly, a bypass pipeline is not arranged, so that when the oil well back pressure reducing device stops working due to reasons, if the mechanical oil production well continues working, the produced fluid of the oil well flows out of a channel and is blocked.
Publication (bulletin) No.: CN208330297U, publication (public notice) day: 2019-01-04 provides a device for reducing back pressure of an oil well, which relates to a ground recovery device in the field of engineering and comprises an outer sleeve and a jet pump assembly, wherein the jet pump assembly comprises a flow guide pipe, a nozzle, a throat pipe and a diffusion pipe which are sequentially communicated, the outer sleeve is cylindrical and is provided with an installation cavity which is arranged along the axial direction of the outer sleeve, the flow guide pipe, the nozzle, the throat pipe and the diffusion pipe are sequentially arranged along the axial line of the outer sleeve and are detachably installed in the installation cavity, the outer sleeve is provided with a liquid production inlet which is correspondingly matched with the nozzle, one end of the flow guide pipe, which faces away from the nozzle, is provided with a liquid inlet, and the outer sleeve is further provided with a doped liquid inlet which is communicated with the liquid inlet. The device for reducing the back pressure of the oil well is installed on a station entering pipeline, and can accelerate the flow rate and the temperature of liquid in the station entering pipeline, so that scaling or wax precipitation is slowed down, and the back pressure of the oil well is reduced.
Publication (bulletin) No.: CN205591893U, publication (public notice) day: 2016-09-21 discloses an oil well pressure lowering and returning device, which comprises a first horse head, a second horse head, a beam, a bearing, a support, a lifting rope, a weighting block, a first oil well pump, a second oil well pump, a motor, a transmission belt, a gearbox, a crank, a connecting rod, a base, a one-way valve, a polish rod, an oil inlet pipe and an oil outlet pipe, wherein the support is installed on the base, the beam is installed at the top end of the support through the bearing, and the first horse head and the second horse head are respectively installed at two ends of the beam. Through plunger low-speed reciprocating motion, can reduce the well head back pressure, the oil absorption negative pressure that the during operation formed is little, can effectually reduce crude oil degasification, has avoided low, the pump body vibrations problem of pump efficiency because of degasification and cavitation cause, and then has improved the operational reliability of device.
Publication (bulletin) No.: CN103256015B, publication (public notice) day: 2015-10-21 provides a wellhead back pressure control system and a wellhead back pressure control method for pressure control drilling. The well head back pressure control system of accuse pressure well drilling includes: a slurry pump; controlling pressure and automatically throttling the manifold; a liquid-gas separator; the mud pool is respectively connected with the mud pump, the pressure control automatic throttling manifold and the liquid-gas separator; rotating the blowout preventer; a mud manifold system, the mud manifold system comprising: branch I, branch II, branch III and branch IV connected through cross t3, branch V connected with branch II through tee t5, and branch V and branch IV are connected through tee t 8. The wellhead back pressure control method uses the wellhead back pressure control system of the pressure control drilling. The slurry guide manifold system is used for replacing a back pressure pump system, so that the operation cost is reduced, the field area is saved, and high fault factors are eliminated.
Publication (bulletin) No.: CN107191154B, publication (public notice) day: 2020-07-31 discloses a wellhead back pressure regulation and control method and a device, the method comprises the steps of obtaining a back pressure value of a wellhead and an opening degree value of a throttle valve in real time, and respectively calculating a back pressure deviation of the wellhead and an opening degree deviation of the throttle valve; when the back pressure deviation is larger than a preset back pressure coarse adjustment threshold value, regulating and controlling the wellhead back pressure based on the opening deviation of the throttle valve, so that the throttle valve reaches the opening set value of the throttle valve; and when the back pressure deviation is smaller than or equal to a preset back pressure coarse adjustment threshold value, regulating and controlling the wellhead back pressure based on the opening deviation of the throttle valve and the back pressure deviation of the wellhead so that the wellhead back pressure reaches the preset precision range of a wellhead back pressure set value. The method realizes undisturbed switching between the opening control and the back pressure control, and the pressure is stable and free of fluctuation during switching. The method has the capability of quick adjustment in case of large deviation and accurate regulation and control in case of small deviation, and has good control effect. The control method is simplified, the implementation is easy, and the control effect is stable.
Publication (bulletin) No.: CN109538144A, publication (public notice) day: 2019-03-29 relates to a wellhead back pressure automatic control system and method, which comprises a first pressure sensor, a second pressure sensor, a third pressure sensor, a compensation pump, a throttling valve, a well depth sensor and an analysis controller; the invention solves the problems that the existing fine pressure control equipment is more in matching, the pressure control system is complex, the investment cost is higher, the development strategy of the low cost of the Changqing oil field is not met, and the later promotion is difficult.
In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, or the technical fields or the application occasions are different, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.
Disclosure of Invention
The present invention has been made in view of the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a back pressure reducing device and method for cooperating with a mechanical oil production well, which can reliably and safely pump and pressurize produced fluid produced from the oil well, thereby reducing the back pressure of the oil well and reducing the load on an oil production system of the oil well.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of reduction back pressure device cooperating with mechanical oil production well, including cam rotor pump, electric motor, differential pressure switch;
the cam rotor pump is arranged on the Christmas tree produced liquid output pipeline, namely, the inlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through the inlet end pipeline of the cam pump, and the outlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through the outlet end pipeline of the cam pump;
the power output end of the motor is connected with the power input end of the cam rotor pump;
the pressure difference switch is a water pipe type pressure difference switch and is connected to the pipeline at the inlet end of the cam rotor pump.
Further, the motor is connected with the cam rotor pump through a bell coupling.
Furthermore, the cam pump further comprises a bypass pipeline, the initial end of the bypass pipeline is connected with the outlet end pipeline of the cam pump, and the tail end of the bypass pipeline is connected with the inlet end pipeline of the cam pump.
Furthermore, a check valve is arranged on the bypass pipeline, and only liquid in the bypass pipeline can flow from the outlet end pipeline of the cam pump to the inlet end pipeline of the cam pump.
Furthermore, the check valve adopts vertical installation, and the check valve includes check valve shell, disk seat, valve ball, valve bonnet, disk seat and valve bonnet are fixed inside the check valve, and the valve ball is located between the disk seat of below and the valve bonnet of top, and the diameter of the centre bore of disk seat and valve bonnet all is less than the diameter of valve ball.
Further, the motor is electrically connected with the electric control cabinet through a motor power supply line, and the differential pressure switch is electrically connected with the electric control cabinet through a control signal line.
Furthermore, the differential pressure switch comprises a differential pressure switch shell, a signal wire binding post, a pressing force adjusting screw, a pressing force spring, an insulating plate, a switch contact and a plunger;
a signal cavity and a plunger cavity which are communicated are formed in the differential pressure switch shell;
the plunger is arranged in the plunger cavity, the outer wall of the plunger is in sealed sliding connection with the inner wall of the plunger cavity, and the front end of the plunger cavity is connected with the inlet end pipeline of the cam pump;
the starting end of the signal wire binding post is arranged in the signal cavity, and the tail end of the signal wire binding post extends out of the signal cavity;
the insulating plate is fixed at the rear end of the plunger, a signal trigger rod is transversely arranged on the insulating plate, and the end part of the signal trigger rod corresponds to the switch contact at the starting end of the signal wire binding post in a front-back manner;
the pressing force adjusting screw is arranged in a screw hole formed in the center of the rear end of the differential pressure switch shell, and the front end of the pressing force adjusting screw extends into the signal cavity;
the front end of the pressing force spring is fixedly connected with the insulating plate, and the rear end of the pressing force spring is fixedly connected with the front end of the pressing force adjusting screw.
Furthermore, a sealing guide plate is transversely arranged in the switch, a plunger guide hole is formed in the center of the sealing guide plate, the lower half section of the plunger is a diameter reducing section, and the diameter reducing section slides in the plunger guide hole.
In order to achieve the purpose, the invention adopts the following technical scheme:
a use method of a pressure reducing device which is cooperated with a mechanical oil production well comprises the steps that a pressing force adjusting screw is adjusted to set a pressure set value when a plunger moves towards the inside or the outside of a connected pipeline, the set value is 0.1-0.2MPa higher than atmospheric pressure, when the pressure in the connected pipeline is lower than the set value, the plunger of a water pipe type pressure difference switch moves towards the inside of the connected pipeline, a trigger switch contact is communicated, otherwise, when the pressure in the pipeline is higher than the set value, the plunger of the water pipe type pressure difference switch moves towards the outside of the pipeline, and the trigger switch contact is disconnected;
the bypass pipeline with the check valve is respectively connected with the inlet end pipeline and the outlet end pipeline of the cam rotor pump, the check valve is vertically arranged, and the check valve ball is seated on the valve seat under the action of self gravity, so that the valve ball is seated by utilizing the gravity, the damage of the spring force to seat the check valve due to the failure of the spring is avoided, and the pressure required for opening the valve ball can be reduced by controlling the density of the valve ball;
when the cam rotor pump works, the pressure at the outlet end of the pump is greater than that at the inlet end, and the bypass pipeline is closed by the single flow valve; when the cam rotor pump does not work due to reasons, the back pressure of the oil well rises, the produced liquid opens the check valve and flows out through the bypass pipeline, and therefore the blockage of the produced liquid flow channel when the cam rotor pump does not work is avoided.
Compared with the prior art, the invention has the following beneficial effects:
the cam rotor pump is a pump for pressurizing fluid by means of reverse rotation of two mutually meshed rubber rotors, and can be used for pumping and pressurizing produced fluid produced from oil well to wellhead.
The water pipe type differential pressure switch is arranged on a pipeline at the inlet end of the cam rotor pump, two end faces of a plunger of the water pipe type differential pressure switch respectively bear the pressure in the pipeline and the atmospheric pressure outside the pipeline, the switch contacts are communicated to send a signal for closing the cam rotor pump to the control cabinet according to the change of the pressure difference inside and outside the pipeline, and the switch contacts move towards the inner direction of the connected pipeline when the pressure is lower than a set value, and send a signal for starting the cam rotor pump to the outer direction of the pipeline when the pressure is higher than an upper limit.
The bypass pipeline with the check valve is connected to the inlet end pipeline and the outlet end pipeline of the cam rotor pump, the check valve arranged in the bypass pipeline is vertically arranged, the check valve ball is seated on the valve seat by means of gravity, produced liquid can only flow towards the outlet end direction from the inlet end of the cam rotor pump through the bypass pipeline, and the reverse flow is sealed by the single flow valve.
And the control cabinet receives signals sent by the water pipe type differential pressure switch and controls the connection or disconnection of the cam rotor pump for power supply.
The invention has the function of synchronously starting or stopping work according to whether the oil production system normally produces or not, and also has the function of enabling oil well produced liquid to flow out of the bypass pipeline when the oil well produced liquid is damaged. The pressure in the pipeline at the inlet end of the cam rotor pump is detected through the water pipe type differential pressure switch, the set value of the pressure in the pipeline is 0.1-0.2MPa higher than the atmospheric pressure, when the pressure is reduced to the value range, the oil extraction system is considered not to produce liquid, at the moment, the plunger of the water pipe type differential pressure switch moves towards the inner direction of the connected pipeline under the action of the spring force, the switch contact is triggered, the switch is in a communicated state, and a signal for closing the power supply of the cam rotor pump is sent to the control cabinet, so that the cam rotor pump is closed in time. The cam rotor pump is prevented from working in a liquid-free state for a long time. On the contrary, when the oil extraction system recovers to work and the pressure rises to be higher than the set value, the oil extraction system is considered to be producing liquid, at the moment, the plunger of the water pipe type differential pressure switch moves towards the outside of the pipeline under the action of the pressure in the pipeline, the switch is triggered to be in an off state, and a power supply signal for starting the cam rotor pump is sent to the control cabinet, so that the cam rotor pump is started.
The invention connects a bypass pipeline with a check valve at the inlet end and the outlet end of the cam rotor pump, the check valve is vertically arranged, and is seated on the valve seat by using the gravity of a check valve ball, thus the valve ball is seated by using the gravity, the damage of the spring force to seat the check valve due to the failure of the spring is avoided, and the pressure required for opening the valve ball can be reduced by controlling the material and the density for manufacturing the valve ball. When the cam rotor pump works, the pressure at the outlet end of the pump is larger than that at the inlet end, and the bypass pipeline is closed by the single-flow valve. When the cam rotor pump does not work due to reasons, the back pressure of the oil well rises, the produced liquid opens the check valve and flows out through the bypass pipeline, and therefore the blockage of the produced liquid flow channel when the cam rotor pump does not work is avoided.
Drawings
FIG. 1 is a schematic view of a pressure reducing device of the present invention operating in conjunction with a mechanical production well;
FIG. 2 is a schematic diagram of the construction of a vertically mounted check valve of the present invention;
FIG. 3 is a schematic view of a water tube type differential pressure switch according to the present invention.
In the figure: 1-cam rotor pump, 2-bell coupling, 3-motor, 4-control cabinet, 5-motor power supply line, 6-control signal line, 7-differential pressure switch, 8-single flow valve, 9-bypass pipeline, 10-cam pump inlet pipeline, 11-cam pump outlet pipeline, 22-shell, 23-valve cover, 24-valve ball, 25-valve seat, 31-signal line terminal, 32-pressing force adjusting screw, 33-pressing force spring, 34-insulating plate, 35-switch contact, 36-shell and 37-plunger.
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.
Example 1:
referring to fig. 1 to 3, the present invention provides a technical solution:
a kind of reduction back pressure device cooperating with mechanical oil production well, including cam rotor pump 1, electric motor 3, differential pressure switch 7;
the cam rotor pump is arranged on a Christmas tree produced liquid output pipeline, namely, an inlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through a cam pump inlet end pipeline 10, and an outlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through a cam pump outlet end pipeline 11;
the power output end of the motor is connected with the power input end of the cam rotor pump;
the pressure difference switch is a water pipe type pressure difference switch and is connected to the pipeline at the inlet end of the cam rotor pump.
Further, the motor is connected with the cam rotor pump through a bell coupling 2.
Furthermore, the device also comprises a bypass pipeline 9, wherein the initial end of the bypass pipeline is connected with an outlet end pipeline of the cam pump, and the tail end of the bypass pipeline is connected with an inlet end pipeline of the cam pump.
Furthermore, a check valve 8 is arranged on the bypass pipeline, so that liquid in the bypass pipeline can only flow from the outlet pipeline of the cam pump to the inlet pipeline of the cam pump.
Furthermore, the check valve adopts vertical installation, and the check valve includes check valve shell, disk seat 25, valve ball 24, valve bonnet 23, disk seat and valve bonnet are fixed inside the check valve, and the valve ball is located between the disk seat of below and the valve bonnet of top, and the diameter of the centre bore of disk seat and valve bonnet all is less than the diameter of valve ball.
Further, the motor is electrically connected with an electric control cabinet 4 through a motor power supply line 5, and the differential pressure switch is electrically connected with the electric control cabinet through a control signal line 6.
Further, the differential pressure switch comprises a differential pressure switch shell, a signal wire binding post 31, a pressing force adjusting screw 32, a pressing force spring 33, an insulating plate 34, a switch contact 35 and a plunger 37;
a signal cavity and a plunger cavity which are communicated are formed in the differential pressure switch shell;
the plunger is arranged in the plunger cavity, the outer wall of the plunger is in sealed sliding connection with the inner wall of the plunger cavity, and the front end of the plunger cavity is connected with the inlet end pipeline of the cam pump;
the starting end of the signal wire binding post is arranged in the signal cavity, and the tail end of the signal wire binding post extends out of the signal cavity;
the insulating plate is fixed at the rear end of the plunger, a signal trigger rod is transversely arranged on the insulating plate, and the end part of the signal trigger rod corresponds to the switch contact at the starting end of the signal wire binding post in a front-back manner;
the pressing force adjusting screw is arranged in a screw hole formed in the center of the rear end of the differential pressure switch shell, and the front end of the pressing force adjusting screw extends into the signal cavity;
the front end of the pressing force spring is fixedly connected with the insulating plate, and the rear end of the pressing force spring is fixedly connected with the front end of the pressing force adjusting screw.
Furthermore, a sealing guide plate is transversely arranged in the switch, a plunger guide hole is formed in the center of the sealing guide plate, the lower half section of the plunger is a diameter reducing section, and the diameter reducing section slides in the plunger guide hole.
The cam rotor pump is a pump for pressurizing fluid by means of reverse rotation of two mutually meshed rubber rotors, and can be used for pumping and pressurizing produced fluid produced from an oil well to a wellhead, the type of the cam rotor pump is the same as the range of the fluid production of a mechanical oil production well in terms of the rated discharge capacity, and the rated pressure is not less than 1.8MPa, so that the requirement can be met.
The water pipe type differential pressure switch is arranged on a pipeline at the inlet end of the cam rotor pump, the water pipe type differential pressure switch is provided with a plunger, the end faces on two sides of the plunger respectively bear the pressure in the pipeline and the atmospheric pressure outside the pipeline, the movement is carried out according to the change of the pressure difference between the inside and the outside of the pipeline, if the change of the atmospheric pressure outside the pipeline is ignored, the water pipe type differential pressure switch is only controlled by the pressure in the pipeline, when the pressure is lower than a set value, the water pipe type differential pressure switch moves towards the inner direction of the connected pipeline and sends a signal for closing the cam rotor pump, and when the pressure is higher than the set value, the water pipe type differential pressure switch moves towards the outer direction of the pipeline and sends a signal for starting the cam rotor pump. Because of the influence of the friction force of the sealing ring on the plunger, the pressure difference exists when the plunger moves towards the inside of the pipeline and moves towards the outside of the pipeline, the difference is allowed, and the switching frequency of starting and closing the cam rotor pump is favorably reduced.
The two ends of the bypass pipeline with the check valve are respectively connected to the inlet end and the outlet end of the cam rotor pump, the check valve arranged in the bypass pipeline is vertically arranged, the check valve ball is seated on the valve seat by means of gravity, produced liquid can only flow from the inlet end of the cam rotor pump to the outlet end of the bypass pipeline, and the produced liquid flows in the reverse direction and is sealed by the check valve.
The control cabinet receives signals sent by the water pipe type differential pressure switch and controls the starting or closing of the working power supply of the cam rotor pump. The control cabinet can be purchased directly for the plc, and the control device is clear to those skilled in the art, and the structure and control principle of the plc will not be described again.
The water pipe type differential pressure switch 7 is arranged on the inlet end pipeline 10 of the cam rotor pump, the pressure set value when the plunger 37 moves towards the inside or outside of the connected pipeline is set through adjusting the pressing force adjusting screw 32, the set value is 0.1-0.2MPa higher than the atmospheric pressure, when the pressure in the connected pipeline is lower than the set value, the plunger 37 of the water pipe type differential pressure switch 7 moves towards the inside of the connected pipeline, the trigger switch contact 35 is connected, otherwise, when the pressure in the pipeline is higher than the set value, the plunger 37 of the water pipe type differential pressure switch 7 moves towards the outside of the pipeline, and the trigger switch contact 35 is disconnected. And the bypass pipeline 9 with the check valve 8 is respectively connected with an inlet pipeline 10 and an outlet pipeline 11 of the cam rotor pump. The check valve 8 is vertically arranged, the check valve ball 24 is seated on the valve seat 25 under the action of self gravity, so that the valve ball seat is sealed by utilizing the gravity, the damage of the spring force to seat the check valve due to the failure of the spring is avoided, and the pressure required for opening the valve ball can be reduced by controlling the density of the valve ball. When the cam rotor pump works, the pressure at the outlet end of the pump is larger than that at the inlet end, and the bypass pipeline is closed by the single-flow valve. When the cam rotor pump does not work due to reasons, the back pressure of the oil well rises, the produced liquid opens the check valve and flows out through the bypass pipeline, and therefore the blockage of the produced liquid flow channel when the cam rotor pump does not work is avoided. An inlet end pipeline 10 of the cam rotor pump is connected with a produced liquid output pipeline of the Christmas tree, and an outlet end pipeline 11 is connected with a pipeline in the direction of the oil gathering station.
Example 2:
the water pipe type differential pressure switch 7 of example 1 was replaced with a normally closed type. When the pressure in the pipeline is lower than the set value, the plunger 37 of the water pipe type differential pressure switch 7 moves towards the inner direction of the connected pipeline, the trigger switch contact 35 is disconnected, and the control cabinet 4 closes the cam rotor pump 1 after receiving a signal. On the contrary, when the pressure in the connected pipeline 10 is higher than the set value, the plunger 37 of the water pipe type differential pressure switch 7 moves towards the direction outside the pipeline, the trigger switch contact 35 is communicated, and the control cabinet 4 starts the cam rotor pump 1 after receiving the signal.
The device uses the cam rotor pump as a booster pump, is arranged on an output pipeline of the produced liquid of the Christmas tree, and pumps and pressurizes the produced liquid. A water pipe type differential pressure switch is arranged on a pipeline at the inlet end of the cam rotor pump, when the pressure is lower than a set value, a signal is sent out, the cam rotor pump is closed by the control cabinet, otherwise, the cam rotor pump is started, and the water pipe type differential pressure switch is arranged, so that the cam rotor pump can be prevented from continuously working when the mechanical oil extraction system cannot work due to reasons. The device is at cam rotor pump entry and exit end pipeline, connects a bypass pipeline, establishes the single current valve of vertical arrangement in the bypass pipeline, and cam rotor pump during operation, bypass pipeline are closed by the single current valve and can not flow back, and when cam rotor pump was out of work because of the reasons, the oil well output liquid opened the single current valve and flowed out by the bypass pipeline, can avoid the risk of cam rotor pump during out-of-work pipeline jam.
All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A kind of reduction back pressure device cooperating with mechanical oil production well, characterized by that, including cam rotor pump, electric motor, differential pressure switch;
the cam rotor pump is arranged on the Christmas tree produced liquid output pipeline, namely, the inlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through the inlet end pipeline of the cam pump, and the outlet of the cam rotor pump is connected with the Christmas tree produced liquid output pipeline through the outlet end pipeline of the cam pump;
the power output end of the motor is connected with the power input end of the cam rotor pump;
the pressure difference switch is a water pipe type pressure difference switch and is connected to the pipeline at the inlet end of the cam rotor pump.
2. A reduced back pressure apparatus for use in conjunction with a mechanical production well according to claim 1 wherein said electric motor is coupled to a lobe rotor pump by a bell coupling.
3. A reduced back pressure apparatus for cooperation with a mechanical production well according to claim 1 or 2 further comprising a bypass conduit connected at its beginning to the outlet end conduit of the cam pump and at its end to the inlet end conduit of the cam pump.
4. A reduced back pressure apparatus and method for use with a mechanical production well according to claim 3 wherein the bypass line is fitted with a check valve to allow fluid in the bypass line to flow only from the outlet side of the cam pump to the inlet side of the cam pump.
5. A device for reducing back pressure in conjunction with a mechanical production well according to claim 4, characterized in that the check valve is vertically mounted and comprises a check valve housing, a valve seat, a valve ball and a valve bonnet, the valve seat and the valve bonnet are fixed inside the check valve, the valve ball is located between the lower valve seat and the upper valve bonnet, and the diameters of the central holes of the valve seat and the valve bonnet are smaller than the diameter of the valve ball.
6. A device for reducing back pressure in cooperation with a mechanical production well according to claim 1, 2 or 5, wherein the electric motor is electrically connected to the electric control cabinet through a motor power supply line, and the differential pressure switch is electrically connected to the electric control cabinet through a control signal line.
7. A reduced back pressure apparatus for working in conjunction with a mechanical production well according to claim 1, 2 or 5 wherein said differential pressure switch comprises a differential pressure switch housing, signal line terminals, hold-down force adjusting screws, hold-down force springs, insulating plates, switch contacts, plungers;
a signal cavity and a plunger cavity which are communicated are formed in the differential pressure switch shell;
the plunger is arranged in the plunger cavity, the outer wall of the plunger is in sealed sliding connection with the inner wall of the plunger cavity, and the front end of the plunger cavity is connected with the inlet end pipeline of the cam pump;
the starting end of the signal wire binding post is arranged in the signal cavity, and the tail end of the signal wire binding post extends out of the signal cavity;
the insulating plate is fixed at the rear end of the plunger, a signal trigger rod is transversely arranged on the insulating plate, and the end part of the signal trigger rod corresponds to the switch contact at the starting end of the signal wire binding post in a front-back manner;
the pressing force adjusting screw is arranged in a screw hole formed in the center of the rear end of the differential pressure switch shell, and the front end of the pressing force adjusting screw extends into the signal cavity;
the front end of the pressing force spring is fixedly connected with the insulating plate, and the rear end of the pressing force spring is fixedly connected with the front end of the pressing force adjusting screw.
8. The apparatus of claim 7, further comprising a seal guide plate disposed laterally within the switch, the seal guide plate having a plunger guide hole at a center thereof, the plunger having a reduced diameter section at a lower half thereof, the reduced diameter section sliding within the plunger guide hole.
9. A method for using a device for reducing back pressure in cooperation with a mechanical oil production well is characterized in that a pressing force adjusting screw is adjusted to set a pressure set value when a plunger moves towards the inside or the outside of a connected pipeline, the set value is 0.1-0.2MPa higher than atmospheric pressure, when the pressure in the connected pipeline is lower than the set value, the plunger of a water pipe type differential pressure switch moves towards the inside of the connected pipeline, a trigger switch contact is communicated, otherwise, when the pressure in the pipeline is higher than the set value, the plunger of the water pipe type differential pressure switch moves towards the outside of the pipeline, and the trigger switch contact is disconnected;
the bypass pipeline with the check valve is respectively connected with the inlet end pipeline and the outlet end pipeline of the cam rotor pump, the check valve is vertically arranged, and the check valve ball is seated on the valve seat under the action of self gravity, so that the valve ball is seated by utilizing the gravity, the damage of the spring force to seat the check valve due to the failure of the spring is avoided, and the pressure required for opening the valve ball can be reduced by controlling the density of the valve ball;
when the cam rotor pump works, the pressure at the outlet end of the pump is greater than that at the inlet end, and the bypass pipeline is closed by the single flow valve; when the cam rotor pump does not work due to reasons, the back pressure of the oil well rises, the produced liquid opens the check valve and flows out through the bypass pipeline, and therefore the blockage of the produced liquid flow channel when the cam rotor pump does not work is avoided.
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| CN202011005160.7A CN114427530A (en) | 2020-09-22 | 2020-09-22 | Device and method for reducing back pressure in cooperative work with mechanical oil production well |
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| CN202011005160.7A CN114427530A (en) | 2020-09-22 | 2020-09-22 | Device and method for reducing back pressure in cooperative work with mechanical oil production well |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4411047A (en) * | 1979-02-21 | 1983-10-25 | Baxter Travenol Laboratories, Inc. | Liquid delivery system |
| CN2874018Y (en) * | 2006-04-04 | 2007-02-28 | 朱英杰 | Well head back pressure controller for petroleum production |
| CN201218421Y (en) * | 2008-05-21 | 2009-04-08 | 张雷 | Enclosed oil well relay oil transportation system |
| CN201908631U (en) * | 2011-01-20 | 2011-07-27 | 大庆油田有限责任公司 | Pumping well ground negative pressure oil collecting device |
| CN202394807U (en) * | 2011-12-27 | 2012-08-22 | 刘为敏 | Double-cavity and double-membrane interlocking differential pressure switch |
| CN205402244U (en) * | 2016-02-26 | 2016-07-27 | 西安聚朗能源科技有限公司 | Continuous oil transportation supercharging device |
| CN208294498U (en) * | 2018-05-02 | 2018-12-28 | 延长油田股份有限公司志丹采油厂 | A kind of tapping equipment of adjustable well mouth of oil well casing gas |
| CN208848825U (en) * | 2018-10-24 | 2019-05-10 | 浙江力夫自控技术股份有限公司 | Small pressure switch |
| CN210178337U (en) * | 2019-07-05 | 2020-03-24 | 吉林坤鼎石油设备科技开发有限公司 | Oil well casing gas recovery pressure reducing device |
-
2020
- 2020-09-22 CN CN202011005160.7A patent/CN114427530A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4411047A (en) * | 1979-02-21 | 1983-10-25 | Baxter Travenol Laboratories, Inc. | Liquid delivery system |
| CN2874018Y (en) * | 2006-04-04 | 2007-02-28 | 朱英杰 | Well head back pressure controller for petroleum production |
| CN201218421Y (en) * | 2008-05-21 | 2009-04-08 | 张雷 | Enclosed oil well relay oil transportation system |
| CN201908631U (en) * | 2011-01-20 | 2011-07-27 | 大庆油田有限责任公司 | Pumping well ground negative pressure oil collecting device |
| CN202394807U (en) * | 2011-12-27 | 2012-08-22 | 刘为敏 | Double-cavity and double-membrane interlocking differential pressure switch |
| CN205402244U (en) * | 2016-02-26 | 2016-07-27 | 西安聚朗能源科技有限公司 | Continuous oil transportation supercharging device |
| CN208294498U (en) * | 2018-05-02 | 2018-12-28 | 延长油田股份有限公司志丹采油厂 | A kind of tapping equipment of adjustable well mouth of oil well casing gas |
| CN208848825U (en) * | 2018-10-24 | 2019-05-10 | 浙江力夫自控技术股份有限公司 | Small pressure switch |
| CN210178337U (en) * | 2019-07-05 | 2020-03-24 | 吉林坤鼎石油设备科技开发有限公司 | Oil well casing gas recovery pressure reducing device |
Non-Patent Citations (1)
| Title |
|---|
| [苏]E.B.盖尔茨 编，李建藩等 译: "《气动元件和系统》", 31 October 1990, 机械工业出版社, pages: 103 - 104 * |
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