Oil pumping unit

Abstract

The invention belongs to the technical field of petroleum field operation devices, and particularly relates to a pumping unit which comprises a base, a large frame, a rear support, a motor, a speed reducer, a crank, a lower connecting rod, a rocker, an upper connecting rod, a walking beam, a horse head and a balance weight. The lower connecting rod is connected with the middle part of a rocker; the lower part of the rocker is connected with the rear bracket; the upper part of the rocker is connected with the lower part of an upper connecting rod; the upper part of the upper connecting rod is connected with the rear part of a walking beam; the horsehead is flexibly connected with a wellhead load, and the rear part of the walking beam is connected with a counterweight. Compared with a crank balance beam-pumping unit, the crank balance beam-pumping unit has the beneficial effects that the crank balance beam-pumping unit is simple in structure, the length of the crank is shortened, parts are light in weight, installation and maintenance are convenient, practicability is high, industrial production is facilitated, stress of the crank and the connecting rod is reduced, the net torque peak value on the crank shaft is reduced, the installed power is reduced, and electric energy loss is effectively reduced; and the power-saving effect is obvious. And particularly for low-yield wells, the energy-saving effect is particularly obvious, and the popularization and application prospects are wide.

Description

Technical Field

[0001] The present application relates to a device for pumping oil downhole in a petroleum field. Background Art

[0002] At present, the main pumping unit in service in oil fields is the crank-balanced beam pumping unit, which has problems such as high energy consumption, difficulty in adjusting balance, and complex operation procedures. In particular, with the increasing number of low-yield wells in the development of oil fields, the conventional crank-balanced beam pumping unit lifting process for low-yield wells has the problem of low effective load rate and difficulty in adapting to the demand for artificial lifting of large-scale low-yield wells in addition to the aforementioned problems. Summary of the invention

[0003] The purpose of the present application is to provide an oil pump to solve the problems of conventional crank-beam pumping unit lifting process, such as high energy consumption, difficulty in adjusting balance, complex operation procedures and low effective load rate.

[0004] The above purpose is achieved through the following technical solutions:

[0005] The oil pumping unit comprises a base, a large frame, a rear bracket, an electric motor, a reducer, a crank, a lower connecting rod, a rocker, a walking beam, a donkey head and a counterweight.

[0006] The main frame and the rear bracket are fixed to the base, the motor and the reducer are connected and installed on the rear bracket, the reducer shaft is connected to one end of the crank, the other end of the crank is hinged to one end of the lower connecting rod, the other end of the lower connecting rod is hinged to the middle part of the rocker, the lower part of the rocker is hinged to the rear bracket, the upper part of the rocker is hinged to the lower part of the upper connecting rod, the upper part of the upper connecting rod is hinged to the rear part of the rocker beam, the middle part of the rocker beam is hinged to the top of the main frame, the front part of the rocker beam is fixedly connected to the donkey head, the donkey head is flexibly connected to the downhole load, and the rear of the rocker beam is also connected to the counterweight.

[0007] The technical solution of this application has the following beneficial effects:

[0008] 1. The present application adopts a motor to drive the reducer to rotate, drive the crank to rotate, and convert the circular motion of the crank into a multiple-stroke reciprocating linear motion of the wellhead through a crank-connecting rod rocker mechanism. The crank rotation stroke undergoes two stroke increases, namely, the connecting rod rocker stroke increase and the walking beam stroke increase. Under the same walking beam stroke increase, the crank length is shortened to achieve a short crank rotation to meet the multiple-stroke structural design of the wellhead stroke. The existing crank-balanced walking beam pumping unit has only one walking beam stroke increase, and the crank load is large, so its crank is longer and heavier. In comparison, the present application has a simple structure, a shortened crank length, and lightweight components, which makes maintenance convenient, practical, and more conducive to industrial production.

[0009] 2. This application cancels the crank balance of the previous pumping unit and adopts the beam balance to enhance the balancing effect of the counterweight, effectively balance the beam load, reduce the force on the crank and connecting rod, reduce the net torque peak on the crank shaft, reduce the installed power, effectively reduce the power loss, and save electricity. Especially for low-yield wells, the energy-saving effect is particularly obvious, and the prospects for promotion and application are broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings of the technical solutions of the embodiments of the present application only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0011] Figure 1 This is a schematic diagram of an oil pump involved in an embodiment of the present application.

[0012] Figure 2 This is a schematic diagram of the main pumping unit currently in service in oil fields - the crank-balanced beam pumping unit. DETAILED DESCRIPTION

[0013] Figure 1 FIG. 1 is a schematic diagram of a pumping unit structure involved in an embodiment of the present application. Figure 1 As shown, it includes: a base 1, a large frame 2, a rear bracket 3, a motor 4, a reducer 5, a crank 6, a lower connecting rod 7, a rocker 8, an upper connecting rod 9, a walking beam 10, a donkey head 11, and a counterweight 12. Among them, the large frame 2 and the rear bracket 3 are fixed to the base 1, the motor 4 is connected to the reducer 5 and installed on the rear bracket 3, the shaft of the reducer 5 is connected to one end of the crank 6, the other end of the crank 6 is hinged to one end of the lower connecting rod 7, the other end of the lower connecting rod 7 is hinged to the middle of the rocker 8, the lower part of the rocker 8 is hinged to the rear bracket 3, the upper part of the rocker 8 is hinged to the lower part of the upper connecting rod 9, the upper part of the upper connecting rod 9 is hinged to the rear part of the walking beam 10, the middle part of the walking beam 10 is hinged to the top of the large frame 2, the front part of the walking beam 10 is fixedly connected to the donkey head 11, the donkey head 11 is connected to the wellhead load, and the rear part of the walking beam 10 is also connected to the counterweight 12, and the position and weight of the counterweight are adjustable.

[0014] The motor 4 drives the reducer 5 to rotate, driving the crank 6 to rotate in a circle. The crank 6 drives the rocker 8 to swing back and forth around its lower hinge through the lower connecting rod 7. The rocker 8 drives the rocker beam 10 and the donkey head 11 to swing up and down around the middle hinge of the rocker beam 10 through the upper connecting rod 9. The donkey head 11 is flexibly connected to the wellhead load, and the wellhead load reciprocates up and down.

[0015] The counterweight 12 at the rear of the walking beam 10 directly balances the furnace head 11 and the wellhead load through the walking beam 10, and the counterweight force arm can be longer, and its balancing effect is direct and efficient. Figure 2 The middle crank is balanced, and due to the influence of the counterweight 2-7, the forces on the crank 2-6 and the connecting rod 2-8 are increased relative to the balance of the rocker beam.

Claims

1. A pumping unit, the structure of which comprises: It includes a base, a large frame, a rear bracket, a motor, a reducer, a crank, a lower connecting rod, a rocker, an upper connecting rod, a walking beam, a donkey head, and a counterweight; wherein: the large frame and the rear bracket are fixed to the base, the motor is connected to the reducer and installed on the rear bracket, the reducer is connected to the lower connecting rod through the crank, the lower connecting rod is connected to the middle part of the rocker, the lower part of the rocker is connected to the rear bracket, the upper part of the rocker is connected to the lower part of the upper connecting rod, the upper part of the upper connecting rod is connected to the rear of the walking beam, the middle part of the walking beam is hinged to the top of the large frame, the front part of the walking beam is fixedly connected to the donkey head, the donkey head is flexibly connected to the wellhead load, and the rear of the walking beam is also connected to the counterweight; The characteristics are as follows: first, a crank-connecting rod rocker mechanism is adopted to convert the circular motion of the crank into a multiple-stroke reciprocating linear motion of the wellhead load. The crank rotation stroke undergoes two stroke increases, namely, the stroke increase of the connecting rod rocker and the stroke increase of the walking beam. Under the condition of the same walking beam stroke increase, the crank length is shortened to achieve a multiple-stroke structural design in which a short crank rotation meets the wellhead stroke; second, a walking beam balance is adopted to enhance the balancing effect of the counterweight, effectively balance the walking beam load, reduce the force on the crank and the connecting rod, reduce the net torque peak on the crank shaft, and reduce the installed power.

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