CN2225558Y - Roller top driving digital control oil pump - Google Patents

Abstract

The utility model relates to a roller top driving digital control oil pump, which connects a friction roller with a numerical control full speed rare earth synchronous machine directly. The friction roller is arranged on the top of a machine frame of the roller top driving digital control oil pump. The numerical control full speed rare earth synchronous machine is used as an energy converter. The numerical control full speed rare earth synchronous machine is fed back power by a bidirectional variable-frequency inverter. The bidirectional variable-frequency inverter is connected with a power network. The mouth of a producing well is provided with a pressure sensor, a position sensor and a programmable controller. The programmable controller can control the bidirectional variable-frequency inverter. The friction roller drives a flexibility scraper belt on the friction roller to elevate up and down to drive a piston to pump oil. Driving torque of the utility model is large when the piston rod goes in an upward stroke. When the piston rod goes in a downward stroke, potential energy of moving parts can be converted to electrical energy and fed back to the power network. So the dynamic characteristic is good; the energy consumption is low.

Description

Roller-type top-driven digital-controlled beam-pumping unit

The utility model relates to a kind of pumping unit of novel structure, and roller-type top-driven digital-controlled beam-pumping unit just belongs to the petroleum production field of mechanical technique of electromechanical integration.

China's employed pumping unit that recovers the oil in the oil field, normally the mechanical transmission that is made of oil pumping frame and motor, speed reducer, crank-linkage type driving mechanism, cast iron equilibrium block is formed, complex structure, the operation operation is loaded down with trivial details, noise is big, energy consumption is high, the transmission part serious wear.And, because viscous crude and deep mining task are on the rise in China oil field, make the equilibrium problem of just quite sharp-pointed pumping unit power of original contradiction and load more outstanding, although adopt multiple comprehensive mechanical balanced measure, beam balance for example, crank balance, and the power setting of low load with strong power, still can not make the power of pumping unit reach balanced, even reach at the most when the oil pumping load is unexpected to increase several times (for thick matter oil well, it is sizable changing with the crude oil viscosity in a bite oil well), also can keep normal operation and produce, be appreciable as for the waste loss of energy.For example, although the actual power that the drive motor rated power that is equipped with consumes during than oil pumping is much bigger, but because the efficient very low (having only about 0.3-0.4 usually) of present crank-linkage type pumping unit, and the operating conditions of motor is away from design point, in case when running into heavy crude producing, the sense of still can be short of power " unable to do what one wishes ".And, pumping unit is extremely complicated in the load condition of one in the operation period now, in fact the energy of importing from electrical network when the walking beam up stroke has only sub-fraction to be used for promoting the crude oil acting, and most energy are used to the moving element of lift device itself; And when the down stroke, this part potential energy does not discharge work done yet and has wasted with the heating form.In order to improve above-mentioned condition, people have taked various balance of machinery measures to pumping unit, but these measures all will be subjected to the restriction of mechanical structure, counterbalance effect is unsatisfactory, and, because the existence and the influence of these equalizing features, make the stressing conditions of member become complicated more, equipment is more fragile.

The purpose of this utility model provides a kind of roller-type top-driven digital-controlled beam-pumping unit that can solve the dynamic balnce of pumping unit preferably.

The utility model is achieved in that and includes pumping unit shelf, oil pumping pit shaft, swabs, polished rod clamp, friction drum, traction friction band, counterweight and motor, it is characterized in that: described motor is the numerical control full speed rare-earth synchronous motor as transducer, the input end of this motor is connected to two-way variable ratio frequency changer inverter, and this inverter links to each other with power supply network; Pressure transducer, the position transducer of measuring the swabs position and the programmable controller that the variable ratio frequency changer inverter is controlled are housed at the fuel-displaced well head of pumping unit place, and the output terminal of above-mentioned two sensors all links to each other with the input end of programmable controller; Described motor directly links to each other with the friction drum that is installed in the pumping unit top, drives power source as it; The end around property traction friction band on the friction drum joins by polished rod clamp and swabs bar, and the other end then hangs with counterweight.

The utility model be the claimant patented technology " numerical control full speed rare-earth synchronous motor " (CN91203427.0) and " NC full-speed power/electric installation " (CN93200001.0) creation on the basis, be to make former drum type pumping unit into top directly to drive, save numerous and diverse mechanical transmission, be aided with the new pumping unit that contemporary high and new technology equipment and power supply network constitute an electromechanical integration of organic connections together simultaneously.This pumping unit and electrical network are linked to be the organic whole of a controlled exchange energy and balanced power: when the pumping unit up stroke is pumped, obtain energy acting by drive motor from electrical network, but and this moment based on crude viscosity, oil pumping draw together plug travel position etc. and adjust motor output power, rotating speed at any time; When its down stroke, the potential energy that the pumping unit moving element becomes to possess is converted into electric energy by the numerical control rare-earth synchronous motor as transducer again and presents back power supply network, thereby improve the working efficiency and the capacity usage ratio of the utility model pumping unit greatly, make pumping unit dynamic property, energy consumption and power supply quality can both be improved significantly.Simultaneously, the utility model also is provided with agent structure and the using method that changes former pumping unit, has to utilize and applies this invention.

Fig. 1 is that structure of the present utility model is formed schematic representation.

Referring to Fig. 1, the utility model is the drive motor 3 that this cylinder 2 directly is installed in a side of the friction drum 2 of the top of former drum type pumping unit frame 1 installation, this drive motor 3 is numerical control full speed rare-earth synchronous motors, its rotor outer rim is equipped with a plurality of magnetic poles that rare earth permanent-magnetic material is made, its stator coil is circumscribed with two-way variable ratio frequency changer inverter 4, and this inverter 4 links to each other with power supply network 5 again.Scratch on friction drum 2 and traction friction is housed is with 7, this friction is done elevating movement with 7 nationalitys by the rotation of friction drum 2, and an end of friction band links to each other with swabs bar 9 by polished rod clamp 8, and the other end then hangs with counterweight 10.The 11st, the oil pumping pit shaft, the 12nd, oil pumping unit base, 13,14 is respectively pressure transducer of installing near the fuel-displaced well head of pumping unit and the position transducer of measuring the swabs position, the 15th, programmable controller, be used for two-way variable ratio frequency changer inverter is controlled, the output of above-mentioned two sensors then all links to each other with the input end of programmable controller 15.

Master of the present utility model stops mechanical structure and using method and conventional pumping unit and changes little, be still by numerical-control motor 3 as main power source, drive friction drum 2 rotations, and nationality cylinder 2 drives, and drawing rubs makes swabs bar 9 do pumping of suction crude oil with 7 oscilaltions.But when the sucker rod up stroke, numerical-control motor 3 by two-way variable ratio frequency changer power supply 4 from the work done of power supply network feed-in electric energy; This moment, two-way variable ratio frequency changer power supply 4 was under the control of programmable controller 15, but the Ac of introducing from electrical network is transformed into all Ac feed-in rare earth full speed synchronous machines 3 of real time altering of frequency, phase place, electric current, control its rotating speed, turn to, output torque and stroke so that maximum efficiency is extracted crude oil out from the underground.And when after swabs bar 9 arrives summits, moving downward, the potential energy of original loss in vain can drive the rare-earth permanent magnet rotor rotation of drive motor 3 by friction drum 2, the electromotive force that induction generates on its stator coil is also drawn by two-way variable ratio frequency changer inverter 4, and make it with synchronized after feed-in power supply network 5, the energy consumption of pumping unit and dynamic balnce characteristic are improved at all.

Pressure transducer of installing at the mouth of pumped oil well of pumping unit 13 and 14 of position transducers are resistance and the positions when being used to monitor swabs work in the oil well, and be input to simultaneously in the programmable controller 15, compare with the optimal movement parameter of setting in advance according to the motion state of input by programmable controller 15, carry out digital control to two-way variable ratio frequency changer inverter 4, adjust the various parameters of its output voltage, so that swabs can move under optimum condition, just avoided naturally finding time and the appearance of " unable to do what one wishes " phenomenon.Owing to 7 the other end counterweight 10 is housed, make it cooperate the dynamic load the when output torque of drive motor 3 is pumped with regard to only bearing with moving element such as swabs in traction friction.

The motor that the utility model is selected for use is the numerical control full speed rare-earth synchronous motor that has obtained patent.This motor can be irrelevant substantially with load with the supporting steady adjusting rotating speed on a large scale of DCPS digitally controlled power source, mechanical property is good, detent torque is big, rotary inertia is little, this speed load characteristic of suitable especially pumping unit changes the working machine of great disparity as driving power: even rotating speed acute variation from low speed to high speed, its output torque is still kept constant substantially.So just realize easily the variable working condition of pumping unit is driven, it is big to adapt to depths, stratum geological condition difference, the complex situations that parameters such as the oil storage degree of depth, crude oil viscosity, water content differ fundamentally solve the conventional pumping unit existence hard nut to crack that work efficiency is low, energy consumption is high, easy to wear for many years.Simultaneously, this motor also can be converted into feeding electric energy well with the potential energy that produces in the oil pumping working stroke and return power supply network, saves the energy consumption of pumping unit greatly.We can measure various process parameters in advance like this, pack into 15 li of programmable controllers of establishment dynamic Characteristic Data of optimum condition and program, send command adapted thereto by it and give two-way variable ratio frequency changer inverter 4, give the full speed rare-earth synchronous motor excitation by these power supply 4 output pulse widths, frequency, pulse that amplitude is all adjustable, make it to drive the friction drum rotation; While monitors pistons oil pumping operating modes by two sensors 13,14 at any time again and adjusts in real time, can make the utility model operate in optimum condition, and very high productivity and capacity usage ratio are arranged.

Claims (1)

1, a kind of roller-type top-driven digital-controlled beam-pumping unit, include oil pumping frame, oil pumping pit shaft, swabs, polished rod clamp, friction drum, traction friction band, counterweight and motor, it is characterized in that: described motor is the numerical control full speed rare-earth synchronous motor as transducer, the input end of this motor is connected to two-way variable ratio frequency changer inverter, and this inverter links to each other with power supply network; Pressure transducer, the position transducer of measuring the swabs position and the programmable controller that the variable ratio frequency changer inverter is controlled are housed at the fuel-displaced well head of pumping unit place, and the output terminal of above-mentioned two sensors all links to each other with the input end of programmable controller; Described motor directly links to each other with the friction drum that is installed in the pumping unit top, drives power source as it; The end around property traction friction band on the friction drum joins by polished rod clamp and swabs bar, and the other end then hangs with counterweight.