CN214741249U - Oil production device with medicine adding mechanism - Google Patents

Abstract

The utility model relates to the field of oil exploitation, and an oil extraction device with a dosing mechanism is disclosed, comprising a wellhead tee for discharging oil supply liquid, a motor arranged at an upper port of the wellhead tee and an oil pumping mechanism arranged in an oil well, wherein the wellhead tee is arranged on the wellhead tee and communicated with the wellhead tee, a shell is fixed at the lower side of the wellhead tee, a motion conversion mechanism is arranged between the motor and the oil pumping mechanism, and one end of the motion conversion mechanism is connected with the output end of the motor so as to convert the rotary motion of the motor into reciprocating linear motion; the utility model discloses can carry out the interpolation of liquid medicines such as viscosity reducer to intermittent type fluid, reduce fluid viscosity, make crude oil can exploit smoothly and pump out.

Description

Oil production device with medicine adding mechanism

Technical Field

The utility model relates to an oil development field, more specifically say, relate to an oil recovery device of medicine mechanism is added in area.

Background

The mechanical oil extraction method is the most main oil extraction method at present, most of the oil fields in China at present adopt the beam pumping unit to extract, its working principle is that after the electric motor decelerates through the V-belt reduction box, the rotary motion of the reduction box output shaft is converted into the reciprocating motion of the horsehead of the walking beam by a crank rocker mechanism, thus drive polished rod and sucker rod to reciprocate up and down straight line motion, and then transmit this motion to the plunger of the oil pump in the pit through the sucker rod, make it work and pump oil, and the beam pumping unit has the following problems, (1) because the transmission link is many, cause the transmission efficiency to be low; (2) when the stroke is increased, the torque of the reduction gearbox is increased, and the size of the crank and rocker mechanism is inevitably increased under the limitation of the swing angle of the walking beam, so that the external size and the weight of the pumping unit are greatly increased; (3) the inertia load is too large, so that the oil pumping unit bears too large load, the service lives of the speed reducer and the oil pumping unit are shortened, and more serious faults such as broken rods, clamping rods, damage of a speed reducer fluted disc, burning of a motor and the like are easy to occur; (4) the problems of over-high viscosity of crude oil and difficult exploitation exist in the oil extraction process.

Therefore, the problems that the existing beam pumping unit is high in energy consumption, short in stroke, low in efficiency, large and heavy in equipment volume, complex in maintenance and hidden safety hazards when used for mining are solved. The problem that the beam machine cannot adapt to the automatic development of the oil extraction industry is solved. Meanwhile, the problem that the crude oil cannot be smoothly pumped out due to overhigh viscosity in the process of exploitation of the crude oil is solved. These become important technical problems to be solved by the person skilled in the art.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists in the correlation technique to a certain extent at least, the utility model aims to provide an oil recovery device of medicine mechanism is added in area, its oil recovery function that can realize current beam-pumping unit. The system has the advantages of simple structure, self-adaptive adjustment of stroke and stroke frequency, great improvement of system efficiency, obvious energy-saving effect, wide applicability and matching with the requirement of development of oil field oil extraction automation industry.

The utility model provides an oil extraction device with a dosing mechanism, which comprises a wellhead tee, a motor and an oil pumping mechanism, wherein the wellhead tee is used for discharging oil supply liquid, the motor is arranged at the upper port of the wellhead tee, the oil pumping mechanism is arranged in an oil well, the wellhead tee is arranged on the wellhead tee and is communicated with the wellhead tee, the lower side of the wellhead tee is fixed with a shell, a motion conversion mechanism is arranged between the motor and the oil pumping mechanism, one end of the motion conversion mechanism is connected with the output end of the motor so as to convert the rotary motion of the motor into reciprocating linear motion; a ball is arranged in the lower end of the shell, a cavity is arranged in the ball, a moving rod is fixed on the outer wall of the sucker rod, the lower end of the moving rod penetrates and extends into the cavity and is fixed with a right-angle plate, a fluted disc is arranged in the cavity, a medicine supply pipe is fixed in the cavity, the lower side wall of the medicine supply pipe is connected with a medicine outlet pipe, the outer wall of the ball is provided with a discharge hole positioned at the lower side of the medicine outlet pipe, a one-way valve is arranged in the discharge port, a baffle plate is inserted on the medicine outlet pipe in a sliding way, a through hole is arranged on the baffle plate, a telescopic spring is fixed between the end part of the baffle plate and the inner wall of the cavity body, the other end of the baffle plate is rotatably connected with a rotating plate, the other end of the rotating plate is rotatably connected with the outer wall of the fluted disc, a medicine conveying pipe is fixedly embedded in the outer wall of the shell, and the end part of the medicine conveying pipe is connected with the medicine supply pipe.

Preferably, the motion conversion mechanism comprises a ball screw and a ball nut sleeved outside the ball screw, the ball nut can move along the axial direction of the ball screw, the ball screw is connected with the output end of the motor through a transmission shaft, and the ball nut is connected with a sucker rod of the oil pumping mechanism so as to enable the sucker rod to move linearly.

Preferably, the ball screw is connected with the sucker rod through a hexagonal pull rod.

Preferably, still include the casing, motion conversion mechanism sets up in the casing, motion conversion mechanism still including the cover prevent the rotating-structure outside the hexagonal pull rod, prevent that the rotating-structure includes hexagonal seamless pipe and hexagon socket head cover, hexagonal seamless pipe box is in outside the hexagonal pull rod, hexagon socket head cover is in outside the hexagonal seamless pipe and with the casing offsets tightly.

Preferably, a hanging short joint for fixing the motion conversion mechanism is fixedly mounted on the inner wall of the wellhead four-way joint.

Preferably, the bidirectional thrust pipe nipple is abutted against the shell, a bearing is arranged in the bidirectional thrust pipe nipple, the bearing is sleeved outside the transmission shaft, a plurality of axial through holes which are uniformly distributed along the circumferential direction and through which oil supply liquid passes are formed in the bidirectional thrust pipe nipple, and the axial through holes are communicated with the wellhead tee.

Preferably, the outer wall of the ball screw nut is provided with a plurality of arc grooves extending along the axial direction, the arc grooves are uniformly distributed along the circumferential direction of the ball screw nut, and the arc grooves are communicated with the wellhead tee joint.

Preferably, all be provided with the semicircular overflow groove that confession fluid passes through on six lateral walls of hexagon socket head cover, semicircular overflow groove with the well head tee bend link up mutually.

Preferably, the motor is provided with a power-off brake system.

Preferably, the oil pumping mechanism still includes oil pipe, with the plunger pump that the sucker rod is connected, the sucker rod with the plunger pump all sets up in the oil pipe, the plunger pump sets up the below of sucker rod, the sucker rod with the hexagonal pull rod passes through the sucker rod reducer and connects, oil pipe with the casing passes through the oil pipe reducer and connects.

Preferably, a plugging plate positioned on the lower side of the baffle is fixed in the cavity.

The embodiment of the utility model provides a technical scheme includes following beneficial effect:

one end of the motion conversion mechanism is connected with the output end of the motor, the other end of the motion conversion mechanism is connected with the sucker rod of the oil pumping mechanism, so that the rotary motion of the motor is converted into linear motion, the sucker rod is driven to do linear motion, the reciprocating linear motion of the oil pumping mechanism is controlled by adjusting the rotary direction of the motor, and oil is lifted to the wellhead tee joint and is discharged from the wellhead tee joint. The device has the advantages of simple and compact structure and small occupied area, realizes motion conversion by adopting the motion conversion mechanism, greatly improves the system efficiency, has obvious energy-saving effect, is convenient to control, can adaptively adjust the stroke and the frequency of stroke, reduces the workload of manual management, and solves the problems that the existing mechanical oil extraction method mostly adopts a beam-pumping unit for extraction, has high energy consumption, short stroke, low efficiency, large maintenance workload, huge and heavy equipment volume and certain potential safety hazard, and cannot adapt to the automatic development of the oil extraction industry;

the utility model discloses an addition of dispersant, viscosity breaker or scale remover makes the crude oil can exploit smoothly and pump out.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural view of an oil recovery device with a dosing mechanism provided by the utility model;

FIG. 2 is a schematic view of the internal structure of a ball in the oil extraction device with a drug adding mechanism of the present invention;

fig. 3 is a rear view of the casing in the oil production device with the chemical adding mechanism provided by the utility model.

In the figure:

1-motor, 2-dial, 3-wellhead tee, 4-transmission shaft, 5-suspension nipple, 6-bidirectional thrust nipple, 7-ball screw, 8-ball nut, 9-hexagonal pull rod, 10-anti-rotation structure, 11-ball screw centralizer, 12-shell, 13-sucker rod reducer, 14-oil pipe reducer, 15-wellhead cross, 16-sucker rod, 17-oil pipe, 18-plunger pump, 19-casing head, 20-moving rod, 21-ball, 22-medicine supply pipe, 23-medicine outlet pipe, 24-right-angle plate, 25-rotating plate, 26-baffle, 27-expansion spring, 28-one-way valve, 29-plugging plate, 30-medicine delivery pipe and 31-fluted disc.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

Referring to the attached drawings 1-3, the embodiment provides an oil extraction device with a dosing mechanism, which comprises a wellhead tee 3, a motor 1 and an oil pumping mechanism, wherein the wellhead tee 3 is arranged above a wellhead four-way 15 and is communicated with the wellhead four-way 15, the motor 1 is arranged at the upper port of the wellhead tee 3, and a shell 12 is fixed at the lower side of the wellhead four-way 15;

the oil pumping mechanism is arranged in an oil well, a motion conversion mechanism is arranged between the motor 1 and the oil pumping mechanism and is suspended in the wellhead tee joint 15, one end of the motion conversion mechanism is connected with the output end of the motor 1, the other end of the motion conversion mechanism is connected with the sucker rod 16 of the oil pumping mechanism so as to convert the rotary motion of the motor 1 into linear motion and drive the sucker rod 16 to do linear motion, and the reciprocating linear motion of the oil pumping mechanism is controlled by adjusting the rotary direction of the motor 1, so that oil is lifted to the wellhead tee joint 3 and is discharged from the wellhead tee joint 3.

The lower end of the shell 12 is internally provided with a ball 21, the ball 21 is internally provided with a cavity, the outer wall of the sucker rod 16 is fixed with a movable rod 20, the lower end of the movable rod 20 extends into the cavity and is fixed with a right-angle plate 24, the cavity is internally provided with a fluted disc 31, the cavity is internally fixed with a medicine supply pipe 22, the lower side wall of the medicine supply pipe 22 is connected with a medicine outlet pipe 23, the outer wall of the ball 21 is provided with a discharge port positioned at the lower side of the medicine outlet pipe 23, the discharge port is internally provided with a check valve 28, the medicine outlet pipe 23 is slidably inserted with a baffle plate 26, the baffle plate 26 is provided with an opening, an expansion spring 27 is fixed between the end part of the baffle plate 26 and the inner wall of the cavity, the other end of the baffle plate 26 is rotatably connected with a rotating plate 25, the other end of the rotating plate 25 is rotatably connected with the outer wall of the fluted disc 31, the outer wall of the shell 12 is fixedly embedded with a medicine conveying pipe 30, the end part of the medicine conveying pipe 30 is connected with the medicine supply pipe 22, the sucker rod 16 is driven to move up and down in a reciprocating way, and then drive fluted disc 31 reciprocating rotation, when fluted disc 31 corotation, drive upside revolving plate 25 and turn right side and rotate, drive downside revolving plate 25 and turn left, and then realize that two baffles 26 move to the inboard, the discharge gate removes to in the pencil 23 that goes out at this moment, and dispersant, viscosity breaker or the detergent in the pencil 23 that goes out can spout from the discharge gate through the pencil 23 that goes out, flows out from check valve 28 again and contacts with the oil, carries out the fluid dispersion, and then the plunger pump of being convenient for pumps oil.

Wherein, the connection position of the rotating plate 25 and the fluted disc 31 is deviated from the circle center of the fluted disc 31.

Further, the upper end of the medicine conveying pipe 30 is connected with a liquid pump, the liquid pump is located on the outer side of a well head, a dispersing agent, a viscosity reducer or a scale cleaning agent are pumped out to the medicine conveying pipe 30 through the liquid pump and conveyed to the medicine supply pipe 22 and the medicine outlet pipe 23, and a subsequent discharge port is moved to the medicine outlet pipe 23, so that the medicine can be pumped out.

Wherein, be fixed with in the cavity and be located the shutoff board 29 of baffle 26 downside, shutoff board 29 carries out the sheltering from of baffle 26 downside, and remaining dispersant, viscosity breaker or the detergent in the discharge gate are avoided and are leaked.

Wherein, the reciprocating linear motion of the sucker rod 16 is controlled by adjusting the rotation direction of the motor 1, for example, when the motor 1 rotates forwards, the motion conversion mechanism converts the rotation motion of the motor 1 into linear motion, and the motion conversion mechanism controls the sucker rod 16 to move downwards; when the motor 1 rotates reversely, the motion conversion mechanism controls the sucker rod 16 to move upwards, so that reciprocating linear motion is realized.

Alternatively, the motor 1 and the motion conversion mechanism may be connected by a transmission shaft 4 to lengthen the transmission distance of the motor 1.

It should be noted that the motor 1 is connected with the upper port of the wellhead tee 3 through the transition disc 2, the transition disc 2 is provided with a through hole for the transmission shaft 4 to pass through, and the transition disc 2 can seal the upper port of the wellhead tee 3 to prevent the oil from flowing out from the upper port of the wellhead tee 3 to damage the motor 1.

The oil extraction device further comprises a shell 12, the shell 12 extends into an oil well, the motion conversion mechanism is arranged in the shell 12, the top end of the shell 12 is arranged at the wellhead four-way 15 and is suspended in the wellhead four-way 15, the shell 12 is cylindrical, oil flows to the wellhead three-way 3 from the inside of the shell 12, a gap is formed between the inner wall of the wellhead four-way 15 and the shell 12, and therefore the side port of the wellhead four-way 15 is communicated with the oil well, and well washing and the like are facilitated.

The wellhead four-way 15 is arranged above a casing head 19, the casing head 19 is arranged at the wellhead of an oil well, and the shell 12 penetrates through the casing head 19 and extends into the oil well.

Further, the shell 12 and the motion conversion mechanism are fixed in the wellhead four-way 15 through the suspension nipple 5, and the suspension nipple 5 is fixedly installed on the inner wall of the wellhead four-way 15, so that the shell 12 and the motion conversion mechanism can be firmly suspended in the oil well.

According to the arrangement, the structure is simple and compact, the occupied area is small, the motion conversion is realized by adopting the motion conversion mechanism, the system efficiency is greatly improved, the energy-saving effect is obvious, the control is convenient, the stroke and the stroke frequency can be adaptively adjusted, the workload of manual management is reduced, and the problems that the existing mechanical oil extraction method mostly adopts a beam pumping unit for extraction, the energy consumption is high, the stroke is short, the efficiency is low, the maintenance workload is large, the equipment is large in size and heavy, certain potential safety hazards exist, and the development of the oil extraction industry cannot be adapted are solved.

In a preferred embodiment of the present embodiment, the motion conversion mechanism includes a ball screw 7 and a ball nut 8, the ball nut 8 is sleeved outside the ball screw 7, and a plurality of balls are disposed between the ball nut 8 and the ball screw 7, so that the ball nut 8 can move linearly on the ball screw 7, that is, the ball nut 8 can move along the axial direction of the ball screw 7. Wherein, ball 7 is connected with the output of motor 1, and ball 8 is connected with pumping rod 16 of pumping unit, and motor 1 drives ball 7 rotatory, and when ball 7 was rotatory, drive ball 8 linear motion to drive pumping rod 16 linear motion. So set up, realized the motion conversion, converted the rotary motion of motor 1 into linear motion to through the direction of rotation of control motor 1, can control ball screw 8's direction of motion, and reach the reciprocal linear motion of control sucker rod 16, thereby realize pumping.

It should be noted that, the arc-shaped spiral grooves are processed on the ball screw 7 and the ball nut 8, when the ball screw 7 and the ball nut 8 are sleeved together, a spiral raceway is formed, the balls are arranged in the raceway and are fully distributed on the raceway, a ball returning device is further arranged in the ball nut 8, when the ball screw 7 rotates, the balls are driven to roll along the raceway, the returned balls enter the ball returning device from the spiral raceway, the balls are forced to pass over the screw crest to enter an adjacent raceway by the aid of the ball returning device, and the balls perform cyclic motion repeatedly, so that the linear motion of the ball nut 8 is realized.

In order to prevent the ball screw 8 from rotating along with the ball screw 7 and drive the sucker rod 16 to rotate, the ball screw 8 and the sucker rod 16 are connected through the hexagonal pull rod 9, the motion conversion mechanism further comprises an anti-rotation structure 10, and the anti-rotation structure 10 is sleeved outside the hexagonal pull rod 9 to prevent the hexagonal pull rod 9 from rotating, so that the ball screw 8 is indirectly prevented from rotating.

It should be noted that the ball screw 8 and the hexagonal rod 9 are connected by a screw, and the ball screw 8 and the hexagonal rod 9 are welded together in order to enhance the stability of the connection between the ball screw 8 and the hexagonal rod 9.

The rotation preventing structure 10 includes a hexagonal seamless tube and an inner hexagonal sleeve, the hexagonal seamless tube is sleeved outside the hexagonal pull rod 9 and is matched with the hexagonal pull rod 9 to prevent the hexagonal pull rod 9 from rotating, the inner hexagonal sleeve is sleeved outside the hexagonal seamless tube and is matched with the hexagonal seamless tube to prevent the hexagonal seamless tube from rotating, and the inner hexagonal sleeve is abutted against the casing 12 to indirectly prevent the hexagonal pull rod 9 from rotating.

In order to guarantee the circulation of fluid, all be provided with semi-circular overflow groove on six lateral walls of hexagon socket head cap, semi-circular overflow groove runs through hexagon socket head cap along ball 7's axial to semi-circular overflow groove link up with well head tee bend 3 mutually, in order to guarantee that fluid flows into well head tee bend 3.

In this embodiment, oil production device still includes two-way thrust nipple joint 6, and 6 covers of two-way thrust nipple joint are established outside transmission shaft 4 to support tightly each other with casing 12, be provided with the bearing in the two-way thrust nipple joint 6, the bearing housing is outside transmission shaft 4, in order to undertake the axial force of two upper and lower directions, and can guarantee that transmission shaft 4 is rotatory, when transmission shaft 4 walks partially, two-way thrust nipple joint 6 possesses the function of radially rightting transmission shaft 4.

In order to guarantee that fluid normally flows out, be provided with a plurality of axial through-holes on bidirectional thrust nipple joint 6, a plurality of axial through-holes along bidirectional thrust nipple joint 6's circumference evenly distributed, the axis of axial through-hole is parallel with the axis of transmission shaft 4, and the axial through-hole link up mutually with well head tee bend 3 to guarantee that fluid can flow into well head tee bend 3.

The cross-sectional shape of the bidirectional thrust nipple 6 is circular.

In this embodiment, be provided with a plurality of circular arc grooves on ball screw 8's the outer wall, a plurality of circular arc grooves are along ball screw 8's circumference evenly distributed, and the circular arc groove is along ball screw 8's axial extension to the circular arc groove runs through ball screw 8, and the circular arc groove forms the passageway that the confession fluid passes through with 12 inner walls of casing, so that fluid flows to the axial through hole of two-way thrust nipple 6 and flows to well head tee bend 3 through the circular arc groove.

In some embodiments, in order to prevent the sucker rod 16 from rapidly sliding down after the system is suddenly powered off/powered off, the motor 1 is further provided with a power-off band-type brake system, namely, when the system is in a power-off state, the band-type brake is tightly held to prevent the sucker rod 16 from moving, and when the system is powered on, the band-type brake is released to enable the sucker rod 16 to continue to work.

In this embodiment, the pumping mechanism further includes an oil pipe 17 and a plunger pump 18, the plunger pump 18 is connected to the pumping rod 16 and disposed below the pumping rod 16, the pumping rod 16 and the plunger pump 18 are both disposed in the oil pipe 17, and the pumping rod 16 pushes the plunger pump 18 to do work through reciprocating linear motion, so as to lift the oil to the ground.

The sucker rod 16 is connected with the hexagonal pull rod 9 through the sucker rod reducer 13 so as to connect the hexagonal pull rod 9 with the sucker rod 16, and the sucker rod 16 is driven to do work through the motion conversion mechanism; the oil pipe 17 and the housing 12 are connected by the oil pipe reducer 14 to connect the oil pipe 17 with the housing 12 and to ensure that oil can pass from the oil pipe 17 into the housing 12 to be lifted to the surface.

In order to further ensure that the oil extraction device works along the axial direction so as to ensure that the sucker rod 16 can accurately push the plunger pump 18 to do work, a ball screw centralizer 11 is also arranged in the oil extraction device, and the ball screw centralizer 11 is arranged between the anti-rotation structure 10 and the sucker rod reducer 13 and is sleeved outside the hexagonal pull rod 9.

In this embodiment, the oil extraction device further includes a control mechanism, the control mechanism is communicably connected to the motor 1 and can control the forward and reverse rotation of the motor 1, and the control mechanism may be a computer or other control devices.

This embodiment provides a take oil recovery device of medicine mechanism, drive sucker rod 16 through the positive and negative rotation of motor 1 and be reciprocal linear motion to promote plunger pump 18 and do work, lift fluid, as shown in figure 1, the direction that the arrow point indicates is the flow direction of fluid, fluid flows to well head tee bend 3 from oil pipe 17, through the semi-circular overflow groove of interior hexagonal cover, flow to the circular arc groove after again, through the axial through hole, flow in well head tee bend 3, discharge from well head tee bend 3's side port, thereby realize oil recovery.

The oil extraction device with the dosing mechanism provided by the specific embodiment has the advantages of simple and compact structure, small occupied area, and is particularly suitable for being used under the condition of narrow space such as an ocean oil extraction platform, and the like, and the ball screw 7, the ball screw 8, the hexagonal seamless pipe and the inner hexagonal sleeve are adopted, so that the movement conversion is realized by the simple mechanical structure matched with the hexagonal inner hole, the simple mechanical structure is completely exchanged with the existing rod oil pumping system, the whole weight is less than 1 ton, the size is small, and the transportation and the installation are convenient; the oil extraction device has long stroke and low stroke frequency, can effectively reduce the abrasion among the pipe, the rod, the oil well pump and the plunger while ensuring the discharge capacity, and prolongs the pump detection period; the motor 1 directly drives the ball screw 7, the transmission chain is short, the system efficiency is greatly improved, and the energy-saving effect is obvious; the wellhead and ground parts have simple structures, no moving parts, no noise pollution, convenient and safe maintenance and management, convenient and intelligent control, realization of remote measurement and control, self-adaptive adjustment or manual intervention of stroke and stroke frequency, and reduction of workload of manual management.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (8)

1. An oil extraction device with a dosing mechanism comprises a wellhead tee joint (3) for discharging oil supply liquid, a motor (1) installed at an upper port of the wellhead tee joint (3) and an oil pumping mechanism arranged in an oil well, wherein the wellhead tee joint (3) is installed on the wellhead tee joint (15) and communicated with the wellhead tee joint (15), and a shell (12) is fixed on the lower side of the wellhead tee joint (15), the oil extraction device is characterized in that a motion conversion mechanism is arranged between the motor (1) and the oil pumping mechanism, one end of the motion conversion mechanism is connected with an output end of the motor (1) to convert rotary motion into reciprocating linear motion, and the other end of the motion conversion mechanism is connected with an oil pumping rod (16) of the oil pumping mechanism to enable the oil pumping rod (16) to do reciprocating linear motion; the lower extreme internally mounted of casing (12) has ball (21), the cavity has been seted up to ball (21) inside, be fixed with carriage release lever (20) on the outer wall of sucker rod (16), the lower extreme of carriage release lever (20) runs through and extends to the cavity inside and is fixed with right angle board (24), install fluted disc (31) in the cavity, the cavity internal fixation has medicine supply pipe (22), the lower lateral wall of medicine supply pipe (22) is connected with out pencil (23), the discharge gate that is located out pencil (23) downside is seted up to the outer wall of ball (21), install check valve (28) in the discharge gate, slide on medicine supply pipe (23) and insert and be equipped with baffle (26), the opening has been seted up on baffle (26), be fixed with expanding spring (27) between the tip of baffle (26) and the inner wall of cavity, the other end rotation of baffle (26) is connected with commentaries on classics board (25), the other end of the rotating plate (25) is rotatably connected with the outer wall of the fluted disc (31), a medicine conveying pipe (30) is fixedly embedded in the outer wall of the shell (12), and the end part of the medicine conveying pipe (30) is connected with the medicine supply pipe (22).

2. The oil extraction device with the drug adding mechanism is characterized in that the motion conversion mechanism comprises a ball screw (7) and a ball nut (8) sleeved outside the ball screw (7), the ball nut (8) can move along the axial direction of the ball screw (7), the ball screw (7) is connected with the output end of the motor (1) through a transmission shaft (4), and the ball nut (8) is connected with a sucker rod (16) of the oil pumping mechanism to enable the sucker rod (16) to move linearly.

3. The oil extraction device with the drug adding mechanism is characterized in that the ball screw (8) is connected with the sucker rod (16) through a hexagonal pull rod (9).

4. The oil extraction device with the dosing mechanism according to claim 3, wherein the motion conversion mechanism is disposed in the housing (12), the motion conversion mechanism further comprises an anti-rotation structure (10) sleeved outside the hexagonal pull rod (9), the anti-rotation structure (10) comprises a hexagonal seamless pipe and an inner hexagonal sleeve, the hexagonal seamless pipe is sleeved outside the hexagonal pull rod (9), and the inner hexagonal sleeve is sleeved outside the hexagonal seamless pipe and abuts against the housing (12).

5. The oil extraction device with the dosing mechanism according to claim 1, characterized in that a hanging nipple (5) for fixing the motion conversion mechanism is fixedly mounted on the inner wall of the wellhead four-way (15).

6. The oil extraction device with the dosing mechanism according to claim 4, further comprising a bidirectional thrust nipple (6) abutting against the housing (12), wherein a bearing is arranged in the bidirectional thrust nipple (6), the bearing is sleeved outside the transmission shaft (4), a plurality of axial through holes which are uniformly distributed along the circumferential direction and through which oil can pass are arranged on the bidirectional thrust nipple (6), and the axial through holes are communicated with the wellhead tee (3).

7. The oil extraction device with the dosing mechanism according to claim 6, wherein the oil pumping mechanism further comprises an oil pipe (17) and a plunger pump (18) connected with the sucker rod (16), the sucker rod (16) and the plunger pump (18) are both arranged in the oil pipe (17), the plunger pump (18) is arranged below the sucker rod (16), the sucker rod (16) is connected with the hexagonal pull rod (9) through a reducer of the sucker rod (16), and the oil pipe (17) is connected with the housing (12) through a reducer of the oil pipe (17).

8. The oil extraction device with the dosing mechanism according to claim 1, characterized in that a plugging plate (29) is fixed in the cavity below the baffle (26).

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