CN113586544A - Lifting hydraulic system of tubing string and use method thereof - Google Patents
Lifting hydraulic system of tubing string and use method thereof Download PDFInfo
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- CN113586544A CN113586544A CN202110887258.8A CN202110887258A CN113586544A CN 113586544 A CN113586544 A CN 113586544A CN 202110887258 A CN202110887258 A CN 202110887258A CN 113586544 A CN113586544 A CN 113586544A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 540
- 239000010720 hydraulic oil Substances 0.000 claims description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 239000003129 oil well Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000005381 potential energy Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- -1 meanwhile Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
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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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
- E21B19/086—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with a fluid-actuated cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
- F15B1/265—Supply reservoir or sump assemblies with pressurised main reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
- F15B11/072—Combined pneumatic-hydraulic systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A lifting hydraulic system and a using method thereof comprise a combined hydraulic cylinder, a first hydraulic valve group, a second hydraulic valve group, a third hydraulic valve group, a hydraulic supply system, a pressure oil tank and a normal-pressure oil tank. The combined hydraulic cylinder comprises a plunger cylinder and a piston cylinder which are coaxially arranged, a plunger oil cavity is arranged in the plunger cylinder, a first oil cavity and a second oil cavity are arranged in the piston cylinder, an oil outlet end of a first hydraulic valve group is communicated with the second oil cavity, an oil outlet end of a second hydraulic valve group is communicated with the first oil cavity, an oil outlet end of a third hydraulic valve group is communicated with the plunger oil cavity, oil inlet ends of the hydraulic valve groups are communicated with an oil outlet end of a hydraulic supply system, and the oil inlet ends of the hydraulic supply system are arranged at the bottom of a normal-pressure oil tank. The design not only can flexibly adjust the working power according to the weight of the oil pipe column, avoid causing power waste and effectively improve the economy and the environmental protection, but also has simple control system mechanism and high reliability.
Description
Technical Field
The invention relates to a lifting hydraulic system, in particular to a lifting hydraulic system of an oil pipe column and a using method thereof, which are particularly suitable for a lifting hydraulic system with adjustable working power.
Background
In recent years, the development of energy is more and more emphasized in various countries, and the demand of various onshore petroleum energy equipment is more and more increased. Wherein tubing is a conduit used to transport crude oil and natural gas from a hydrocarbon reservoir to the surface after drilling is complete and to withstand the pressures generated during production. In the operations of well workover or pump overhaul and the like of an oil field, an oil pipe and a sucker rod are required to be lifted out of the well one by one, and after the operations are finished, the oil pipe and the sucker rod are put into the oil well one by one.
At present, the lifting and the lowering of an oil pipe are usually carried out by 3 types of equipment of mechanical type, hydraulic type and electric control type, the 3 types of equipment can meet the requirement that the oil pipe can be prevented from being lifted or lowered to be disordered and damage the oil pipe, but the following defects still exist:
1. the existing hoisting equipment generally designs the installed power of the whole system to be large in order to meet the requirement of quickly hoisting an oil pipe in the hoisting time, and the actually required power in the auxiliary time is small, so that the installed power of the system is greatly wasted;
2. the mechanical type calandria has low cost, but the equipment occupies large space and has low transmission precision;
3. the hydraulic calandria has high reliability, does not need special explosion-proof treatment, can realize stepless speed change, but has relatively complex control system;
4. the electric control type calandria transmission precision is high, but the cost is high, and meanwhile, a complex machine-side explosion-proof control cabinet is needed.
Disclosure of Invention
The invention aims to overcome the defects that the lifting equipment in the prior art has overlarge installed power, is wasted in the using process and has a complex control system, and provides a lifting hydraulic system with adjustable power and a simple control system.
In order to achieve the above purpose, the technical solution of the invention is as follows: a hoist hydraulic system for a tubing string, the hoist hydraulic system comprising: the hydraulic system comprises a combined hydraulic cylinder, a first hydraulic valve group, a second hydraulic valve group, a third hydraulic valve group, a hydraulic supply system, a pressure oil tank and a normal-pressure oil tank; the combined hydraulic cylinder comprises a plunger cylinder and a piston cylinder which are coaxially arranged, the piston cylinder is arranged in the plunger cylinder, the side wall of the piston cylinder is in sliding fit with a piston cylinder opening at the top of the plunger cylinder, the piston cylinder is in sealing fit with the plunger cylinder, a plunger oil cavity is arranged in the plunger cylinder, a first oil cavity and a second oil cavity are arranged in the piston cylinder, the oil outlet end of the first hydraulic valve group is communicated with a second oil cavity arranged in the piston cylinder through an oil pipe, the oil outlet end of the second hydraulic valve group is communicated with a first oil cavity arranged in the piston cylinder through an oil pipe, the oil outlet end of the third hydraulic valve group is communicated with a plunger oil cavity arranged in the plunger cylinder through an oil pipe, the oil inlet ends of the first hydraulic valve group, the second hydraulic valve group and the third hydraulic valve group are communicated with the oil outlet end of a hydraulic supply system, and the oil inlet end of the hydraulic supply system is arranged at the bottom of a normal-pressure oil tank.
The first hydraulic valve block includes: the hydraulic control system comprises a first hydraulic control reversing valve, a first manual reversing valve and a first one-way throttle valve; the first hydraulic control reversing valve is a two-position three-way hydraulic valve, the first manual reversing valve is a two-in two-out hydraulic valve group, the oil inlet end of the first hydraulic control reversing valve is communicated with the oil outlet end of the hydraulic supply system, the oil outlet end of the first hydraulic control reversing valve is communicated with a second oil cavity arranged in the piston cylinder after passing through the throttle valve, the oil return end of the first hydraulic control reversing valve is communicated with the pressure oil tank, the first hydraulic control end of the first hydraulic control reversing valve is communicated with the first working port of the first manual reversing valve through a first one-way throttle valve, the second hydraulic control end of the first hydraulic control reversing valve is communicated with the second working port of the first manual reversing valve through a first one-way throttle valve, the oil inlet end of the first manual reversing valve is communicated with the oil outlet end of the hydraulic supply system, and the oil return end of the first manual reversing valve is communicated with the normal-pressure oil tank;
the second hydraulic valve group comprises a second hydraulic control reversing valve, a second manual reversing valve and a second one-way throttle valve; the second hydraulic control reversing valve is a two-position three-way hydraulic valve, the second manual reversing valve is a two-in two-out hydraulic valve group, the oil inlet end of the second hydraulic control reversing valve is communicated with the oil outlet end of the hydraulic supply system, the oil outlet end of the second hydraulic control reversing valve is communicated with a first oil cavity arranged in the piston cylinder after passing through the throttle valve, the oil return end of the second hydraulic control reversing valve is communicated with the pressure oil tank, the first hydraulic control end of the second hydraulic control reversing valve is communicated with the first working port of the first manual reversing valve through a second one-way throttle valve, the second hydraulic control end of the second hydraulic control reversing valve is communicated with the second working port of the second manual reversing valve through a second one-way throttle valve, the oil inlet end of the second manual reversing valve is communicated with the oil outlet end of the hydraulic supply system, and the oil return end of the second manual reversing valve is communicated with the normal-pressure oil tank;
the third hydraulic valve group comprises a third hydraulic control reversing valve, a third manual reversing valve and a third one-way throttle valve; the third hydraulic control reversing valve is a two-position three-way hydraulic valve, the third manual reversing valve is a two-in two-out hydraulic valve group, the oil inlet end of the third hydraulic control reversing valve is communicated with the oil outlet end of the hydraulic supply system, the oil outlet end of the third hydraulic control reversing valve is communicated with a plunger oil cavity arranged in the plunger cylinder after passing through the throttle valve, the oil return end of the third hydraulic control reversing valve is communicated with the pressure oil tank, the first hydraulic control end of the third hydraulic control reversing valve is communicated with the first working port of the third manual reversing valve through a third one-way throttle valve, the second hydraulic control end of the third hydraulic control reversing valve is communicated with the second working port of the third manual reversing valve through a third one-way throttle valve, the oil inlet end of the third manual reversing valve is communicated with the oil outlet end of the hydraulic supply system, and the oil return end of the third manual reversing valve is communicated with the normal-pressure oil tank;
the oil outlet end of the first hydraulic valve bank is the oil outlet end of the first hydraulic control reversing valve, the oil outlet end of the second hydraulic valve bank is the oil outlet end of the second hydraulic control reversing valve, the oil outlet end of the third hydraulic valve bank is the oil outlet end of the third hydraulic control reversing valve, the oil inlet end of the first hydraulic valve bank is the oil inlet end of the first hydraulic control reversing valve, the oil inlet end of the second hydraulic valve bank is the oil inlet end of the second hydraulic control reversing valve, and the oil inlet end of the third hydraulic valve bank is the oil inlet end of the third hydraulic control reversing valve.
The first hydraulic control reversing valve, the second hydraulic control reversing valve and the third hydraulic control reversing valve are hydraulic reversing valves with one inlet and one outlet, and the first manual reversing valve, the second manual reversing valve and the third manual reversing valve are H-shaped two-position four-way reversing valves.
The hydraulic supply system includes: the system comprises a main pump, a main pump check valve, an overflow valve, a gas-liquid cylinder and a nitrogen cylinder; the oil feed end and the ordinary pressure oil tank of main pump are linked together, the oil outlet end of main pump is linked together through the oil feed end of main pump check valve back with the overflow valve and the oilhole of hydraulic cylinder, the oil feed end of overflow valve still is linked together with the oil feed end of first hydraulic valve group, second hydraulic valve group and third hydraulic valve group, the oil feed end and the ordinary pressure oil tank of overflow valve are linked together, the gas pocket and the nitrogen cylinder of pneumatic cylinder are linked together.
And a hoisting device is arranged at the end part of a piston rod of the piston cylinder.
The pressure oil tank is an oil tank which is arranged at a high position and stores the gravitational potential energy of the hydraulic oil.
A method of using a hydraulic system for lifting a tubing string, the method comprising the steps of:
the first step is as follows: a preparation step, wherein an operator opens a main switch of a lifting hydraulic system, and a hydraulic supply system starts to work;
the second step is that: judging, the required lifting force grade of hydraulic system is judged according to oil pipe column weight to the operating personnel, the hoisting accessory that sets up provides ascending lifting force for the piston cylinder when injecting hydraulic oil in plunger oil pocket or the first oil pocket, the hoisting accessory that sets up provides decurrent power of transferring for the piston cylinder when injecting hydraulic oil in the second oil pocket, it is shown as table 1 to promote hydraulic system lifting force grade:
table 1:
in table 1, + is the oil passage from the oil inlet end to the oil outlet end of the hydraulic control directional control valve corresponding to the oil chamber, at this time, the oil chamber is communicated with the oil outlet end of the main pump check valve, -is the oil passage from the oil outlet end to the oil return end of the hydraulic control directional control valve corresponding to the oil chamber, at this time, the oil chamber is communicated with the pressure oil tank;
the third step: lifting, wherein an operator fixedly connects a lifting device arranged on a piston cylinder with the oil pipe column, and after the lifting device is fixedly connected with the oil pipe column, the operator manually switches gears of a first manual directional control valve, a second manual directional control valve and a third manual directional control valve according to a lifting force gear determined in the determination step, so that hydraulic oil enters a hydraulic control end of the corresponding hydraulic control directional control valve after passing through an oil inlet end and a working port of the manual directional control valve, the hydraulic oil enters the hydraulic control end of the hydraulic control directional control valve and then drives the hydraulic control directional control valve to be reversed, after the hydraulic control directional control valve is reversed, an oil path from the oil inlet end to an oil outlet end in the hydraulic control directional control valve is communicated, the hydraulic oil enters a corresponding oil cavity, the lifting force of the lifting hydraulic system is larger than the weight of the oil pipe column, when the lifting force of the lifting hydraulic system is larger than the weight of the oil pipe column, the oil pipe column rises, and when the oil pipe column rises out of the oil well, the operator takes the lifting device down the oil pipe column, at this point, the lifting step is completed;
the fourth step: and a step of lowering, wherein an operator fixedly connects a lifting device arranged on a piston cylinder with the oil pipe column, and after the lifting device is fixedly connected with the oil pipe column, the operator manually switches gears of a first manual reversing valve and a third manual reversing valve to communicate oil passages from an oil outlet end to an oil return end in the first hydraulic control reversing valve and the third hydraulic control reversing valve, at the moment, the lifting force of a lifting hydraulic system is smaller than the weight of the oil pipe column, the oil pipe column descends into the oil well, meanwhile, hydraulic oil in a second oil cavity and a plunger oil cavity in the combined hydraulic cylinder is pressed into a pressure oil tank by the piston cylinder, when the oil pipe column descends to the height in the oil discharging well, the operator takes down the oil pipe column from the lifting device, and the step of lowering is completed.
And in the third step, when the operator judges that the gravity borne by the oil pipe column is greater than the sum of the resistance provided by the plunger oil cavity and the second oil cavity and the lifting force provided by the working first oil cavity, the operator manually switches the gear of the second manual reversing valve to enable the hydraulic oil to enter the hydraulic control end of the second hydraulic control reversing valve after passing through the oil inlet end and the working port of the second manual reversing valve, the hydraulic oil enters the hydraulic control end of the second hydraulic control reversing valve and then drives the second hydraulic control reversing valve to reverse, after the second hydraulic control reversing valve reverses, the oil passage from the oil inlet end to the oil outlet end in the second hydraulic control reversing valve is communicated, the hydraulic oil enters the first oil cavity, at the moment, the first oil cavity starts to work to provide the lifting force for the oil pipe column, and the descending speed of the oil pipe column is reduced.
Compared with the prior art, the invention has the beneficial effects that:
1. in the use method of the lifting hydraulic system of the oil pipe column, three sets of hydraulic valve groups are utilized to provide hydraulic oil for different oil cavities in the combined hydraulic cylinder, an operator can respectively set gears of the three sets of hydraulic valve groups according to the weight of the oil pipe column to adjust the power of each oil cavity in the combined hydraulic cylinder so as to flexibly adjust the lifting force output by the lifting hydraulic system, the sum of the powers of each oil cavity in the combined hydraulic cylinder is the load power of a hydraulic supply system, and the working power of an oil pump in the hydraulic supply system can be automatically reduced when the load power is smaller so as to save energy. Therefore, the design can flexibly adjust the working power according to the weight of the oil pipe column, avoid causing power waste and effectively improve the economy and the environmental protection.
2. According to the use method of the lifting hydraulic system of the oil string, the manual reversing valve is used as the controller of the hydraulic control reversing valve, an operator indirectly controls the opening and closing of the hydraulic control reversing valve by controlling the gear of the manual reversing valve, an electro-hydraulic proportional control system is not needed to be used as the controller, the mechanical structure is simple, the use is convenient, meanwhile, the damage is not easy, and the reliability is high. Therefore, the control system of the design has the advantages of simple mechanism, high reliability, effective reduction of production cost and prolonged service life.
3. The high-level oil tank, the gas-liquid cylinder and the nitrogen cylinder are arranged in the lifting hydraulic system of the oil pipe column, the gas-liquid cylinder and the nitrogen cylinder jointly form the piston type energy accumulator, when the lifting hydraulic system is used for lowering, hydraulic oil in the combined hydraulic cylinder can enter the high-level oil tank and the piston type energy accumulator through the hydraulic valve group set to be a low-pressure gear, the high-level oil tank stores the gravitational potential energy of the oil pipe column as the gravitational potential energy of the hydraulic oil, the piston type energy accumulator stores the gravitational potential energy of the oil pipe column as elastic potential energy, and the potential energy stored by the high-level oil tank and the piston type energy accumulator can be used for other operations, so that the energy recovery effect is achieved, and the economy and the environmental protection performance of the lifting hydraulic system are effectively improved. Therefore, this design can be with promoting hydraulic system and transfer the energy recycle of release when the step, and the make full use of energy effectively improves economic nature and feature of environmental protection.
4. The hydraulic valve group in the lifting hydraulic system of the oil pipe column is communicated with the combined hydraulic cylinder through the throttle valve, the throttle valve can adjust the passing speed of hydraulic oil, the descending speed of the oil pipe column in the lowering step can be reduced by reducing the passing speed of the hydraulic oil, the speed regulation effect is achieved, meanwhile, in an emergency situation, pressure oil input or output by the combined hydraulic cylinder can be cut off by closing the throttle valve, the braking effect is achieved, and the safety is improved. Therefore, the design can regulate or cut off the pressure oil input or output by the combined hydraulic cylinder through the throttle valve, and the system safety is effectively improved.
5. According to the lifting hydraulic system of the oil pipe column, the manual reversing valve is communicated with the hydraulic control reversing valve through the one-way throttle valve, the one-way throttle valve can adjust the reversing speed of the hydraulic control reversing valve, meanwhile, the reversing impact is reduced, and the stability of the system is improved. Therefore, the design can adjust the reversing speed of the hydraulic control reversing valve through the one-way throttle valve, reduce the reversing impact and effectively improve the working stability of the system.
6. According to the lifting hydraulic system of the tubing string, the oil outlet end of the hydraulic supply mechanism is communicated with the oil tank through the overflow valve, when the output pressure of the hydraulic supply mechanism is overlarge, redundant hydraulic oil can return to the normal-pressure mailbox through the overflow valve, the constancy of the output pressure of the hydraulic supply mechanism is guaranteed, and the system is prevented from being damaged. Therefore, the design can ensure the constancy of the output pressure of the hydraulic supply mechanism through the overflow valve, avoid system damage and effectively improve the safety of system use.
Drawings
Fig. 1 is a hydraulic schematic of the present invention.
In the figure: the hydraulic control system comprises a combined hydraulic cylinder 1, a plunger cylinder 11, a piston cylinder 12, a plunger oil chamber 13, a first oil chamber 14, a second oil chamber 15, a first hydraulic valve group 2, a first hydraulic control reversing valve 21, a first manual reversing valve 22, a first one-way throttle valve 23, a second hydraulic valve group 3, a second hydraulic control reversing valve 31, a second manual reversing valve 32, a second one-way throttle valve 33, a third hydraulic valve group 4, a third hydraulic control reversing valve 41, a third manual reversing valve 42, a third one-way throttle valve 43, a hydraulic supply system 5, a main pump 51, a main pump one-way valve 52, an overflow valve 53, a gas-liquid cylinder 54, a nitrogen gas bottle 55, a pressure oil tank 6, a normal-pressure oil tank 7 and a throttle valve 8.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, a hydraulic lifting system for a tubing string, the hydraulic lifting system comprising: the hydraulic system comprises a combined hydraulic cylinder 1, a first hydraulic valve group 2, a second hydraulic valve group 3, a third hydraulic valve group 4, a hydraulic supply system 5, a pressure oil tank 6 and a normal-pressure oil tank 7; the combined hydraulic cylinder 1 comprises a plunger cylinder 11 and a piston cylinder 12 which are coaxially arranged, the piston cylinder 12 is arranged inside the plunger cylinder 11, the side wall of the piston cylinder 12 is in sliding fit with a piston cylinder opening at the top of the plunger cylinder 11, the piston cylinder 12 is in sealing fit with the plunger cylinder 11, a plunger oil cavity 13 is arranged in the plunger cylinder 11, a first oil cavity 14 and a second oil cavity 15 are arranged in the piston cylinder 12, the oil outlet end of the first hydraulic valve group 2 is communicated with the second oil cavity 15 arranged in the piston cylinder 12 through an oil pipe, the oil outlet end of the second hydraulic valve group 3 is communicated with the first oil cavity 14 arranged in the piston cylinder 12 through an oil pipe, the oil outlet end of the third hydraulic valve group 4 is communicated with the plunger oil cavity 13 arranged in the plunger cylinder 11 through an oil pipe, and the oil inlet ends of the first hydraulic valve group 2, the second hydraulic valve group 3 and the third hydraulic valve group 4 are communicated with the oil outlet end of the hydraulic supply system 5, the oil inlet end of the hydraulic supply system 5 is arranged at the bottom of the normal-pressure oil tank 7.
The first hydraulic valve group 2 comprises: a first pilot operated directional control valve 21, a first manual directional control valve 22, and a first one-way throttle valve 23; the first hydraulic control reversing valve 21 is a two-position three-way hydraulic valve, the first manual reversing valve 22 is a two-in two-out hydraulic valve group, the oil inlet end of the first hydraulic control directional control valve 21 is communicated with the oil outlet end of the hydraulic supply system 5, the oil outlet end of the first hydraulic control reversing valve 21 is communicated with a second oil chamber 15 arranged in the piston cylinder 12 after passing through the throttle valve 8, the oil return end of the first hydraulic control reversing valve 21 is communicated with the pressure oil tank 6, the first hydraulic control end of the first hydraulic control reversing valve 21 is communicated with the first working port of the first manual reversing valve 22 through a first one-way throttle valve 23, the second hydraulic control end of the first hydraulic control reversing valve 21 is communicated with the second working port of the first manual reversing valve 22 through a first one-way throttle valve 23, the oil inlet end of the first manual reversing valve 22 is communicated with the oil outlet end of the hydraulic supply system 5, and the oil return end of the first manual reversing valve 22 is communicated with the normal-pressure oil tank 7;
the second hydraulic valve group 3 comprises a second hydraulic control reversing valve 31, a second manual reversing valve 32 and a second one-way throttle valve 33; the second hydraulic control reversing valve 31 is a two-position three-way hydraulic valve, the second manual reversing valve 32 is a two-in two-out hydraulic valve group, the oil inlet end of the second hydraulic control reversing valve 31 is communicated with the oil outlet end of the hydraulic supply system 5, the oil outlet end of the second hydraulic control reversing valve 31 is communicated with a first oil cavity 14 arranged in the piston cylinder 12 through a throttle valve 8, the oil return end of the second hydraulic control reversing valve 31 is communicated with the pressure oil tank 6, the first hydraulic control end of the second hydraulic control reversing valve 31 is communicated with the first working port of the first manual reversing valve 22 through a second one-way throttle valve 33, the second hydraulic control end of the second hydraulic control reversing valve 31 is communicated with the second working port of the second manual reversing valve 32 through a second one-way throttle valve 33, the oil inlet end of the second manual reversing valve 32 is communicated with the oil outlet end of the hydraulic supply system 5, and the oil return end of the second manual reversing valve 32 is communicated with the normal-pressure oil tank 7;
the third hydraulic valve group 4 comprises a third hydraulic control reversing valve 41, a third manual reversing valve 42 and a third one-way throttle valve 43; the third hydraulic control directional control valve 41 is a two-position three-way hydraulic valve, the third manual directional control valve 42 is a two-in two-out hydraulic valve group, the oil inlet end of the third hydraulic control directional control valve 41 is communicated with the oil outlet end of the hydraulic supply system 5, the oil outlet end of the third hydraulic control reversing valve 41 is communicated with a plunger oil chamber 13 arranged in the plunger cylinder 11 after passing through the throttle valve 8, the oil return end of the third hydraulic control reversing valve 41 is communicated with the pressure oil tank 6, the first hydraulic control end of the third hydraulic control reversing valve 41 is communicated with the first working port of the third manual reversing valve 42 through a third one-way throttle valve 43, the second hydraulic control end of the third hydraulic control reversing valve 41 is communicated with the second working port of the third manual reversing valve 42 through a third one-way throttle valve 43, the oil inlet end of the third manual reversing valve 42 is communicated with the oil outlet end of the hydraulic supply system 5, and the oil return end of the third manual reversing valve 42 is communicated with the normal-pressure oil tank 7;
the end that produces oil of first hydraulic pressure valves 2 is the end that produces oil of first hydraulic control switching-over valve 21, the end that produces oil of second hydraulic pressure valves 3 is the end that produces oil of second hydraulic control switching-over valve 31, the end that produces oil of third hydraulic pressure valves 4 is the end that produces oil of third hydraulic control switching-over valve 41, the oil feed end of first hydraulic pressure valves 2 is the oil feed end of first hydraulic control switching-over valve 21, the oil feed end of second hydraulic pressure valves 3 is the oil feed end of second hydraulic control switching-over valve 31, the oil feed end of third hydraulic pressure valves 4 is the oil feed end of third hydraulic control switching-over valve 41.
The first hydraulic control reversing valve 21, the second hydraulic control reversing valve 31 and the third hydraulic control reversing valve 41 are one-in one-out hydraulic reversing valves, and the first manual reversing valve 22, the second manual reversing valve 32 and the third manual reversing valve 42 are H-shaped two-position four-way reversing valves.
The hydraulic supply system 5 includes: a main pump 51, a main pump check valve 52, an overflow valve 53, a gas-liquid cylinder 54 and a nitrogen cylinder 55; the oil feed end of main pump 51 is linked together with ordinary pressure oil tank 7, the oil outlet end of main pump 51 is linked together through main pump check valve 52 back and the oil feed end of overflow valve 53 and the oilhole of hydraulic cylinder 54, the oil feed end of overflow valve 53 still is linked together with the oil feed end of first hydraulic valve group 2, second hydraulic valve group 3 and third hydraulic valve group 4, the oil outlet end of overflow valve 53 is linked together with ordinary pressure oil tank 7, the gas pocket and the nitrogen cylinder 55 of pneumatic cylinder 54 are linked together.
And a hoisting device is arranged at the end part of a piston rod of the piston cylinder 12.
The pressure oil tank 6 is an oil tank which is arranged at a high position and stores the gravitational potential energy of hydraulic oil.
A method of using a hydraulic system for lifting a tubing string, the method comprising the steps of:
the first step is as follows: a preparation step, wherein an operator opens a main switch of a lifting hydraulic system, and a hydraulic supply system 5 starts to work;
the second step is that: judging, wherein an operator judges a lifting force gear required by the lifting hydraulic system according to the weight of the oil pipe column, a lifting device arranged on the piston cylinder 12 provides upward lifting force when hydraulic oil is injected into the plunger oil cavity 13 or the first oil cavity 14, a lifting device arranged on the piston cylinder 12 provides downward lowering force when hydraulic oil is injected into the second oil cavity 15, and the lifting force gear of the lifting hydraulic system is shown in table 1:
table 1:
in table 1, + is the oil passage from the oil inlet end to the oil outlet end of the pilot operated directional control valve corresponding to the oil chamber, and at this time, the oil chamber is communicated with the oil outlet end of the main pump check valve 52, and-is the oil passage from the oil outlet end to the oil return end of the pilot operated directional control valve corresponding to the oil chamber, and at this time, the oil chamber is communicated with the pressure oil tank 6;
the third step: lifting, wherein an operator fixedly connects a lifting device arranged on a piston cylinder 12 with the oil string, and after the lifting device is fixedly connected with the oil string, the operator manually switches gears of the first manual reversing valve 22, the second manual reversing valve 32 and the third manual reversing valve 42 according to a lifting force gear determined in the determining step, so that hydraulic oil enters a hydraulic control end of the corresponding hydraulic control reversing valve after passing through an oil inlet end and a working port of the manual reversing valve, the hydraulic oil drives the hydraulic control reversing valve to reverse after entering the hydraulic control end of the hydraulic control reversing valve, after the hydraulic control reversing valve is reversed, an oil path from the oil inlet end to an oil outlet end in the hydraulic control reversing valve is communicated, the hydraulic oil enters a corresponding oil cavity 1, so that the lifting force of the lifting hydraulic system is greater than the weight of the oil string, when the lifting force of the lifting hydraulic system is greater than the weight of the oil string, the oil string ascends, and when the oil string ascends to the outside of the oil well, the operator takes the oil string from the lifting device, at this point, the lifting step is completed;
the fourth step: and (2) a lowering step, wherein an operator fixedly connects a lifting device arranged on the piston cylinder 12 with the oil string, and after the lifting device is fixedly connected with the oil string, the operator manually switches gears of the first manual reversing valve 22 and the third manual reversing valve 42 to communicate oil paths from an oil outlet end to an oil return end in the first hydraulic control reversing valve 21 and the third hydraulic control reversing valve 41, at the moment, the lifting force of a lifting hydraulic system is smaller than the weight of the oil string, the oil string descends into the oil well, meanwhile, hydraulic oil in the second oil cavity 15 and the plunger oil cavity 13 in the combined hydraulic cylinder 1 is pressed into the pressure oil tank 6 by the piston cylinder 12, when the oil string descends to the discharging height in the oil well, the operator takes the oil string from the lifting device, and the lowering step is completed.
In the third step, when an operator judges that the gravity borne by the oil pipe column is greater than the sum of the resistance provided by the plunger oil chamber 13 and the second oil chamber 15 and the lifting force provided by the first oil chamber 14 after working, the operator manually switches the gear of the second manual reversing valve 32 to enable the hydraulic oil to enter the hydraulic control end of the second hydraulic control reversing valve 31 after passing through the oil inlet end and the working port of the second manual reversing valve 32, the hydraulic oil enters the hydraulic control end of the second hydraulic control reversing valve 31 and then drives the second hydraulic control reversing valve 31 to reverse, after the second hydraulic control reversing valve 31 reverses, the oil passage from the oil inlet end to the oil outlet end in the second hydraulic control reversing valve 31 is communicated, the hydraulic oil enters the first oil chamber 14, at the moment, the first oil chamber 14 starts to work to provide the lifting force for the oil pipe column, and the descending speed of the oil pipe column is reduced.
The principle of the invention is illustrated as follows:
in the design, a lifting device is arranged on a piston cylinder 12 and is fixedly connected with an oil pipe column to be lifted, and the oil pipe column synchronously ascends or descends when the lifting device ascends or descends;
in the design, a piston cylinder 12 is used as a piston of a plunger cylinder 11, when a plunger oil cavity 13 in the plunger cylinder 11 is filled with oil, the piston cylinder 12 is driven by hydraulic oil to move upwards, a lifting device is lifted at the same time, an oil pipe column to be lifted synchronously rises, when the plunger oil cavity 13 in the plunger cylinder 11 is drained with oil, the piston cylinder 12 is driven by the hydraulic oil and gravity to move downwards, the lifting device is lowered at the same time, and the oil pipe column to be lifted synchronously descends;
in the design, the hoisting device is arranged on a piston of the piston cylinder 12, when the first oil cavity 14 in the piston cylinder 12 is filled with oil, the piston of the piston cylinder 12 is driven by hydraulic oil to move upwards, and simultaneously the hoisting device is lifted, an oil pipe column to be lifted synchronously rises, when the first oil cavity 14 in the piston cylinder 12 is drained with oil or the second oil cavity 15 in the piston cylinder 12 is filled with oil, the piston of the piston cylinder 12 is driven by the hydraulic oil and gravity to move downwards, and simultaneously the hoisting device is lowered, and the oil pipe column to be lifted synchronously descends.
Example 1:
a hoist hydraulic system for a tubing string, the hoist hydraulic system comprising: the hydraulic system comprises a combined hydraulic cylinder 1, a first hydraulic valve group 2, a second hydraulic valve group 3, a third hydraulic valve group 4, a hydraulic supply system 5, a pressure oil tank 6 and a normal-pressure oil tank 7; the combined hydraulic cylinder 1 comprises a plunger cylinder 11 and a piston cylinder 12 which are coaxially arranged, the piston cylinder 12 is arranged inside the plunger cylinder 11, the side wall of the piston cylinder 12 is in sliding fit with a piston cylinder opening at the top of the plunger cylinder 11, the piston cylinder 12 is in sealing fit with the plunger cylinder 11, a plunger oil cavity 13 is arranged in the plunger cylinder 11, a first oil cavity 14 and a second oil cavity 15 are arranged in the piston cylinder 12, the oil outlet end of the first hydraulic valve group 2 is communicated with the second oil cavity 15 arranged in the piston cylinder 12 through an oil pipe, the oil outlet end of the second hydraulic valve group 3 is communicated with the first oil cavity 14 arranged in the piston cylinder 12 through an oil pipe, the oil outlet end of the third hydraulic valve group 4 is communicated with the plunger oil cavity 13 arranged in the plunger cylinder 11 through an oil pipe, and the oil inlet ends of the first hydraulic valve group 2, the second hydraulic valve group 3 and the third hydraulic valve group 4 are communicated with the oil outlet end of the hydraulic supply system 5, the oil inlet end of the hydraulic supply system 5 is arranged at the bottom of the normal-pressure oil tank 7; the first hydraulic valve group 2 comprises: a first pilot operated directional control valve 21, a first manual directional control valve 22, and a first one-way throttle valve 23; the first hydraulic control reversing valve 21 is a two-position three-way hydraulic valve, the first manual reversing valve 22 is a two-in two-out hydraulic valve group, the oil inlet end of the first hydraulic control directional control valve 21 is communicated with the oil outlet end of the hydraulic supply system 5, the oil outlet end of the first hydraulic control reversing valve 21 is communicated with a second oil chamber 15 arranged in the piston cylinder 12 after passing through the throttle valve 8, the oil return end of the first hydraulic control reversing valve 21 is communicated with the pressure oil tank 6, the first hydraulic control end of the first hydraulic control reversing valve 21 is communicated with the first working port of the first manual reversing valve 22 through a first one-way throttle valve 23, the second hydraulic control end of the first hydraulic control reversing valve 21 is communicated with the second working port of the first manual reversing valve 22 through a first one-way throttle valve 23, the oil inlet end of the first manual reversing valve 22 is communicated with the oil outlet end of the hydraulic supply system 5, and the oil return end of the first manual reversing valve 22 is communicated with the normal-pressure oil tank 7; the second hydraulic valve group 3 comprises a second hydraulic control reversing valve 31, a second manual reversing valve 32 and a second one-way throttle valve 33; the second hydraulic control reversing valve 31 is a two-position three-way hydraulic valve, the second manual reversing valve 32 is a two-in two-out hydraulic valve group, the oil inlet end of the second hydraulic control reversing valve 31 is communicated with the oil outlet end of the hydraulic supply system 5, the oil outlet end of the second hydraulic control reversing valve 31 is communicated with a first oil cavity 14 arranged in the piston cylinder 12 through a throttle valve 8, the oil return end of the second hydraulic control reversing valve 31 is communicated with the pressure oil tank 6, the first hydraulic control end of the second hydraulic control reversing valve 31 is communicated with the first working port of the first manual reversing valve 22 through a second one-way throttle valve 33, the second hydraulic control end of the second hydraulic control reversing valve 31 is communicated with the second working port of the second manual reversing valve 32 through a second one-way throttle valve 33, the oil inlet end of the second manual reversing valve 32 is communicated with the oil outlet end of the hydraulic supply system 5, and the oil return end of the second manual reversing valve 32 is communicated with the normal-pressure oil tank 7; the third hydraulic valve group 4 comprises a third hydraulic control reversing valve 41, a third manual reversing valve 42 and a third one-way throttle valve 43; the third hydraulic control directional control valve 41 is a two-position three-way hydraulic valve, the third manual directional control valve 42 is a two-in two-out hydraulic valve group, the oil inlet end of the third hydraulic control directional control valve 41 is communicated with the oil outlet end of the hydraulic supply system 5, the oil outlet end of the third hydraulic control reversing valve 41 is communicated with a plunger oil chamber 13 arranged in the plunger cylinder 11 after passing through the throttle valve 8, the oil return end of the third hydraulic control reversing valve 41 is communicated with the pressure oil tank 6, the first hydraulic control end of the third hydraulic control reversing valve 41 is communicated with the first working port of the third manual reversing valve 42 through a third one-way throttle valve 43, the second hydraulic control end of the third hydraulic control reversing valve 41 is communicated with the second working port of the third manual reversing valve 42 through a third one-way throttle valve 43, the oil inlet end of the third manual reversing valve 42 is communicated with the oil outlet end of the hydraulic supply system 5, and the oil return end of the third manual reversing valve 42 is communicated with the normal-pressure oil tank 7; the oil outlet end of the first hydraulic valve group 2 is the oil outlet end of the first hydraulic control reversing valve 21, the oil outlet end of the second hydraulic valve group 3 is the oil outlet end of the second hydraulic control reversing valve 31, the oil outlet end of the third hydraulic valve group 4 is the oil outlet end of the third hydraulic control reversing valve 41, the oil inlet end of the first hydraulic valve group 2 is the oil inlet end of the first hydraulic control reversing valve 21, the oil inlet end of the second hydraulic valve group 3 is the oil inlet end of the second hydraulic control reversing valve 31, and the oil inlet end of the third hydraulic valve group 4 is the oil inlet end of the third hydraulic control reversing valve 41; the first hydraulic control reversing valve 21, the second hydraulic control reversing valve 31 and the third hydraulic control reversing valve 41 are one-in one-out hydraulic reversing valves, and the first manual reversing valve 22, the second manual reversing valve 32 and the third manual reversing valve 42 are H-shaped two-position four-way reversing valves; the hydraulic supply system 5 includes: a main pump 51, a main pump check valve 52, an overflow valve 53, a gas-liquid cylinder 54 and a nitrogen cylinder 55; the oil inlet end of the main pump 51 is communicated with the normal-pressure oil tank 7, the oil outlet end of the main pump 51 is communicated with the oil inlet end of an overflow valve 53 and the oil hole of a hydraulic cylinder 54 after passing through a main pump check valve 52, the oil inlet end of the overflow valve 53 is also communicated with the oil inlet ends of a first hydraulic valve group 2, a second hydraulic valve group 3 and a third hydraulic valve group 4, the oil outlet end of the overflow valve 53 is communicated with the normal-pressure oil tank 7, and the air hole of the hydraulic cylinder 54 is communicated with a nitrogen bottle 55; a hoisting device is arranged at the end part of a piston rod of the piston cylinder 12; the pressure oil tank 6 is an oil tank which is arranged at a high position and stores the gravitational potential energy of hydraulic oil.
A method of using a hydraulic system for lifting a tubing string, the method comprising the steps of:
the first step is as follows: a preparation step, wherein an operator opens a main switch of a lifting hydraulic system, and a hydraulic supply system 5 starts to work;
the second step is that: judging, wherein an operator judges a lifting force gear required by the lifting hydraulic system according to the weight of the oil pipe column, a lifting device arranged on the piston cylinder 12 provides upward lifting force when hydraulic oil is injected into the plunger oil cavity 13 or the first oil cavity 14, a lifting device arranged on the piston cylinder 12 provides downward lowering force when hydraulic oil is injected into the second oil cavity 15, and the lifting force gear of the lifting hydraulic system is shown in table 1:
table 1:
in table 1, + is the oil passage from the oil inlet end to the oil outlet end of the pilot operated directional control valve corresponding to the oil chamber, and at this time, the oil chamber is communicated with the oil outlet end of the main pump check valve 52, and-is the oil passage from the oil outlet end to the oil return end of the pilot operated directional control valve corresponding to the oil chamber, and at this time, the oil chamber is communicated with the pressure oil tank 6;
the third step: lifting, wherein an operator fixedly connects a lifting device arranged on a piston cylinder 12 with the oil string, and after the lifting device is fixedly connected with the oil string, the operator manually switches gears of the first manual reversing valve 22, the second manual reversing valve 32 and the third manual reversing valve 42 according to a lifting force gear determined in the determining step, so that hydraulic oil enters a hydraulic control end of the corresponding hydraulic control reversing valve after passing through an oil inlet end and a working port of the manual reversing valve, the hydraulic oil drives the hydraulic control reversing valve to reverse after entering the hydraulic control end of the hydraulic control reversing valve, after the hydraulic control reversing valve is reversed, an oil path from the oil inlet end to an oil outlet end in the hydraulic control reversing valve is communicated, the hydraulic oil enters a corresponding oil cavity 1, so that the lifting force of the lifting hydraulic system is greater than the weight of the oil string, when the lifting force of the lifting hydraulic system is greater than the weight of the oil string, the oil string ascends, and when the oil string ascends to the outside of the oil well, the operator takes the oil string from the lifting device, at this point, the lifting step is completed;
the fourth step: and (2) a lowering step, wherein an operator fixedly connects a lifting device arranged on the piston cylinder 12 with the oil string, and after the lifting device is fixedly connected with the oil string, the operator manually switches gears of the first manual reversing valve 22 and the third manual reversing valve 42 to communicate oil paths from an oil outlet end to an oil return end in the first hydraulic control reversing valve 21 and the third hydraulic control reversing valve 41, at the moment, the lifting force of a lifting hydraulic system is smaller than the weight of the oil string, the oil string descends into the oil well, meanwhile, hydraulic oil in the second oil cavity 15 and the plunger oil cavity 13 in the combined hydraulic cylinder 1 is pressed into the pressure oil tank 6 by the piston cylinder 12, when the oil string descends to the discharging height in the oil well, the operator takes the oil string from the lifting device, and the lowering step is completed.
Example 2:
example 2 is substantially the same as example 1 except that:
the second step is as follows: in the judging step, the lifting force gear of the lifting hydraulic system is shown in table 1:
table 1:
example 3:
example 3 is substantially the same as example 2 except that:
in the third step, when an operator judges that the gravity borne by the oil pipe column is greater than the sum of the resistance provided by the plunger oil chamber 13 and the second oil chamber 15 and the lifting force provided by the first oil chamber 14 after working, the operator manually switches the gear of the second manual reversing valve 32 to enable the hydraulic oil to enter the hydraulic control end of the second hydraulic control reversing valve 31 after passing through the oil inlet end and the working port of the second manual reversing valve 32, the hydraulic oil enters the hydraulic control end of the second hydraulic control reversing valve 31 and then drives the second hydraulic control reversing valve 31 to reverse, after the second hydraulic control reversing valve 31 reverses, the oil passage from the oil inlet end to the oil outlet end in the second hydraulic control reversing valve 31 is communicated, the hydraulic oil enters the first oil chamber 14, at the moment, the first oil chamber 14 starts to work to provide the lifting force for the oil pipe column, and the descending speed of the oil pipe column is reduced.
Claims (9)
1. A lifting hydraulic system of a tubing string is characterized in that:
the lift hydraulic system includes: the hydraulic control system comprises a combined hydraulic cylinder (1), a first hydraulic valve group (2), a second hydraulic valve group (3), a third hydraulic valve group (4), a hydraulic supply system (5), a pressure oil tank (6) and a normal pressure oil tank (7); the combined hydraulic cylinder (1) comprises a plunger cylinder (11) and a piston cylinder (12) which are coaxially arranged, the piston cylinder (12) is arranged in the plunger cylinder (11), the side wall of the piston cylinder (12) is in sliding fit with a piston cylinder opening at the top of the plunger cylinder (11), the piston cylinder (12) is in sealing fit with the plunger cylinder (11), a plunger oil cavity (13) is arranged in the plunger cylinder (11), a first oil cavity (14) and a second oil cavity (15) are arranged in the piston cylinder (12), the oil outlet end of the first hydraulic valve group (2) is communicated with the second oil cavity (15) arranged in the piston cylinder (12) through an oil pipe, the oil outlet end of the second hydraulic valve group (3) is communicated with the first oil cavity (14) arranged in the piston cylinder (12) through an oil pipe, the oil outlet end of the third hydraulic valve group (4) is communicated with the plunger oil cavity (13) arranged in the plunger cylinder (11) through an oil pipe, the oil inlet ends of the first hydraulic valve group (2), the second hydraulic valve group (3) and the third hydraulic valve group (4) are communicated with the oil outlet end of the hydraulic supply system (5), and the oil inlet end of the hydraulic supply system (5) is arranged at the bottom of the normal-pressure oil tank (7).
2. The hydraulic system for lifting a tubing string as claimed in claim 1, wherein:
the first hydraulic valve group (2) comprises: the hydraulic control reversing valve comprises a first hydraulic control reversing valve (21), a first manual reversing valve (22) and a first one-way throttle valve (23); the hydraulic control system is characterized in that the first hydraulic control directional control valve (21) is a two-position three-way hydraulic valve, the first manual directional control valve (22) is a two-inlet two-outlet hydraulic valve group, the oil inlet end of the first hydraulic control directional control valve (21) is communicated with the oil outlet end of the hydraulic supply system (5), the oil outlet end of the first hydraulic control directional control valve (21) is communicated with a second oil cavity (15) arranged in a piston cylinder (12) through a throttle valve (8), the oil return end of the first hydraulic control directional control valve (21) is communicated with a pressure oil tank (6), the first hydraulic control end of the first hydraulic control directional control valve (21) is communicated with a first working port of the first manual directional control valve (22) through a first one-way throttle valve (23), the second hydraulic control end of the first hydraulic control directional control valve (21) is communicated with a second working port of the first manual directional control valve (22) through the first one-way throttle valve (23), the oil inlet end of the first manual directional control valve (22) is communicated with the oil outlet end of the hydraulic supply system (5), the oil return end of the first manual reversing valve (22) is communicated with a normal-pressure oil tank (7);
the second hydraulic valve group (3) comprises a second hydraulic control reversing valve (31), a second manual reversing valve (32) and a second one-way throttle valve (33); the second hydraulic control reversing valve (31) is a two-position three-way hydraulic valve, the second manual reversing valve (32) is a two-inlet two-outlet hydraulic valve group, the oil inlet end of the second hydraulic control reversing valve (31) is communicated with the oil outlet end of the hydraulic supply system (5), the oil outlet end of the second hydraulic control reversing valve (31) is communicated with a first oil cavity (14) arranged in the piston cylinder (12) through a throttle valve (8), the oil return end of the second hydraulic control reversing valve (31) is communicated with the pressure oil tank (6), the first hydraulic control end of the second hydraulic control reversing valve (31) is communicated with a first working port of the first manual reversing valve (22) through a second one-way throttle valve (33), the second hydraulic control end of the second hydraulic control reversing valve (31) is communicated with a second working port of the second manual reversing valve (32) through the second one-way throttle valve (33), and the oil inlet end of the second manual reversing valve (32) is communicated with the oil outlet end of the hydraulic supply system (5), the oil return end of the second manual reversing valve (32) is communicated with the normal-pressure oil tank (7);
the third hydraulic valve group (4) comprises a third hydraulic control reversing valve (41), a third manual reversing valve (42) and a third one-way throttle valve (43); the third hydraulic control reversing valve (41) is a two-position three-way hydraulic valve, the third manual reversing valve (42) is a two-inlet two-outlet hydraulic valve group, the oil inlet end of the third hydraulic control reversing valve (41) is communicated with the oil outlet end of the hydraulic supply system (5), the oil outlet end of the third hydraulic control reversing valve (41) is communicated with a plunger oil cavity (13) arranged in the plunger cylinder (11) through a throttle valve (8), the oil return end of the third hydraulic control reversing valve (41) is communicated with the pressure oil tank (6), the first hydraulic control end of the third hydraulic control reversing valve (41) is communicated with the first working port of the third manual reversing valve (42) through a third one-way throttle valve (43), the second hydraulic control end of the third hydraulic control reversing valve (41) is communicated with the second working port of the third manual reversing valve (42) through the third one-way throttle valve (43), and the oil inlet end of the third manual reversing valve (42) is communicated with the oil outlet end of the hydraulic supply system (5), the oil return end of the third manual reversing valve (42) is communicated with the normal-pressure oil tank (7).
3. The hydraulic system for lifting a tubing string as claimed in claim 2, wherein:
the end that produces oil of first hydraulic pressure valves (2) is the end that produces oil of first pilot-controlled switching-over valve (21), the end that produces oil of second hydraulic pressure valves (3) is the end that produces oil of second pilot-controlled switching-over valve (31), the end that produces oil of third hydraulic pressure valves (4) is the end that produces oil of third pilot-controlled switching-over valve (41), the oil feed end of first hydraulic pressure valves (2) is the oil feed end of first pilot-controlled switching-over valve (21), the oil feed end of second hydraulic pressure valves (3) is the oil feed end of second pilot-controlled switching-over valve (31), the oil feed end of third hydraulic pressure valves (4) is the oil feed end of third pilot-controlled switching-over valve (41).
4. The tubing string hoist hydraulic system of any one of claims 1, 2, or 3, wherein:
the first hydraulic control reversing valve (21), the second hydraulic control reversing valve (31) and the third hydraulic control reversing valve (41) are hydraulic reversing valves with one inlet and one outlet, and the first manual reversing valve (22), the second manual reversing valve (32) and the third manual reversing valve (42) are H-shaped two-position four-way reversing valves.
5. The hydraulic system for lifting a tubing string as claimed in claim 4, wherein:
the hydraulic supply system (5) includes: the system comprises a main pump (51), a main pump check valve (52), an overflow valve (53), a gas-liquid cylinder (54) and a nitrogen cylinder (55); the oil feed end of main pump (51) is linked together with ordinary pressure oil tank (7), the oil outlet end of main pump (51) is linked together through main pump check valve (52) back and the oil feed end of overflow valve (53) and the oilhole of hydraulic cylinder (54), the oil feed end of overflow valve (53) still is linked together with the oil feed end of first hydraulic valve group (2), second hydraulic valve group (3) and third hydraulic valve group (4), the oil outlet end of overflow valve (53) is linked together with ordinary pressure oil tank (7), the gas pocket and nitrogen cylinder (55) of pneumatic cylinder (54) are linked together.
6. The hydraulic system for lifting a tubing string as claimed in claim 5, wherein:
and a hoisting device is arranged at the end part of a piston rod of the piston cylinder (12).
7. The hydraulic system for lifting a tubing string as claimed in claim 6, wherein:
the pressure oil tank (6) is an oil tank which is arranged at a high position and stores the gravitational potential energy of hydraulic oil.
8. Use of the hydraulic system for lifting of a tubing string according to any one of claims 1 to 7, characterized in that:
the using method comprises the following steps:
the first step is as follows: a preparation step, wherein an operator opens a main switch of the lifting hydraulic system, and a hydraulic supply system (5) starts to work;
the second step is that: judging step, the required lifting force shelves of hydraulic system are judged according to oil pipe column weight to the operating personnel, the hoisting accessory that sets up provides ascending lifting force on the piston cylinder (12) when injecting hydraulic oil in plunger oil pocket (13) or first oil pocket (14), the hoisting accessory that sets up on the piston cylinder (12) provides decurrent power of transferring when injecting hydraulic oil in second oil pocket (15), it is shown as table 1 to promote hydraulic system lifting force shelves:
table 1:
in the table 1, + is the oil passage from the oil inlet end to the oil outlet end of the hydraulic control reversing valve corresponding to the oil chamber, and the oil chamber is communicated with the oil outlet end of the main pump one-way valve (52), and-is the oil passage from the oil outlet end to the oil return end of the hydraulic control reversing valve corresponding to the oil chamber, and the oil chamber is communicated with the pressure oil tank (6);
the third step: a lifting step, wherein an operator fixedly connects a lifting device arranged on a piston cylinder (12) with the oil string, and after the lifting device is fixedly connected with the oil string, the operator manually switches the gears of a first manual reversing valve (22), a second manual reversing valve (32) and a third manual reversing valve (42) according to the lifting force gear determined in the determining step, so that hydraulic oil enters the hydraulic control end of the corresponding hydraulic control reversing valve after passing through the oil inlet end and the working port of the manual reversing valve, the hydraulic oil drives the hydraulic control reversing valve to reverse after entering the hydraulic control end of the hydraulic control reversing valve, after the hydraulic control reversing valve is reversed, the oil passages from the oil inlet end to the oil outlet end in the hydraulic control reversing valve are communicated, the hydraulic oil enters the corresponding oil cavity 1, so that the lifting force for lifting the hydraulic system is greater than the weight of the oil string, when the lifting force for lifting the hydraulic system is greater than the weight of the oil string, the oil string lifts, and when the oil string lifts outside the oil well, an operator takes the tubing string off the hoisting device, and the hoisting step is completed;
the fourth step: and a lowering step, wherein an operator fixedly connects a lifting device arranged on a piston cylinder (12) with the oil string, and after the lifting device is fixedly connected with the oil string, the operator manually switches gears of a first manual reversing valve (22) and a third manual reversing valve (42) to communicate oil paths from an oil outlet end to an oil return end in the first hydraulic control reversing valve (21) and the third hydraulic control reversing valve (41), at the moment, the lifting force of a lifting hydraulic system is smaller than the weight of the oil string, the oil string descends into the oil well, hydraulic oil in a second oil cavity (15) and a plunger oil cavity (13) in the combined hydraulic cylinder (1) is pressed into a pressure oil tank (6) by the piston cylinder (12), and when the oil string descends to a discharging height in the oil well, the operator takes the oil string from the lifting device, and the lowering step is completed.
9. Use of the hydraulic system for lifting a tubing string according to claim 8, characterized in that:
and in the third step of lowering, when an operator judges that the gravity borne by the oil pipe column is greater than the sum of the resistance provided by the plunger oil chamber (13) and the second oil chamber (15) and the lifting force provided by the first oil chamber (14) after working, the operator manually switches the gear of the second manual reversing valve (32), so that hydraulic oil enters the hydraulic control end of the second hydraulic control reversing valve (31) after passing through the oil inlet end and the working port of the second manual reversing valve (32), the hydraulic oil enters the hydraulic control end of the second hydraulic control reversing valve (31) and then drives the second hydraulic control reversing valve (31) to reverse, after the second hydraulic control reversing valve (31) reverses, the oil passages from the oil inlet end to the oil outlet end in the second hydraulic control reversing valve (31) are communicated, the hydraulic oil enters the first oil chamber (14), at the moment, the first oil chamber (14) starts to work to provide the lifting force for the oil pipe column, and the lowering speed of the oil pipe column is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110887258.8A CN113586544A (en) | 2021-08-03 | 2021-08-03 | Lifting hydraulic system of tubing string and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110887258.8A CN113586544A (en) | 2021-08-03 | 2021-08-03 | Lifting hydraulic system of tubing string and use method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113586544A true CN113586544A (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110887258.8A Pending CN113586544A (en) | 2021-08-03 | 2021-08-03 | Lifting hydraulic system of tubing string and use method thereof |
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| Country | Link |
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| CN (1) | CN113586544A (en) |
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| US5390747A (en) * | 1992-12-10 | 1995-02-21 | Drilling Technology Research Institute Of Shengli Oilfield | Well rig lift system and a hydraulic energy-storing well rig lift system |
| CN201588602U (en) * | 2009-12-07 | 2010-09-22 | 烟台大学 | Energy-saving hydraulic oil pumping unit |
| CN206017290U (en) * | 2016-08-31 | 2017-03-15 | 山东泰丰液压股份有限公司 | Load-sensitive axial plunger pump |
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