CN110714906B - A screw-driven downhole oil pumping device - Google Patents

Abstract

The invention relates to a screw-driven downhole oil pumping device, comprising a lower end cover, a reversing assembly, a connecting cylinder I, a connecting cylinder II, a connecting sleeve, a rolling screw pair, an upper end cover, a reciprocating rod, an upper joint casing, a nut joint, connecting rod and pulling rod; one end of the pulling rod is connected with the rolling screw pair, and the other end is connected with the lower pressing ring and the upper return ring respectively, the output shaft is connected with the rolling screw pair through the connecting sleeve, and the reciprocating rod is located in the rolling screw pair The other end is located in the upper joint sleeve and is connected with the post through the nut joint; the lower end cover, the connecting cylinder I, the connecting cylinder II, the rolling screw pair, the upper end cover and the upper joint sleeve are connected in sequence. The invention uses rotary power input, and the screw output reciprocates to drive the oil pump to produce oil; compared with other types of oil production machines, the screw-driven oil production occupies a relatively small space, and the transmission efficiency of the ball screw or the static pressure screw is relatively high.

Description

A screw-driven downhole oil pumping device

technical field

The invention relates to a pumping unit for oil fields, in particular to a screw-driven downhole oil pumping device.

Background technique

With the development of oil reservoirs, high-quality oil reservoirs on land have been fully developed, and at the same time, the drilling depth is increasing, the underlying environment is more complicated, and the requirements for drilling and production machinery are getting higher and higher. Subject to certain restrictions, and there are many problems. With the increase of oil production depth, the efficiency of rod oil production equipment is getting lower and lower, and the equipment accident rate is getting higher and higher. Although there are certain mitigation measures, the problem of eccentric wear of oil rods Without fundamental improvement, it is precisely because of the emergence of these new working conditions that the development of rodless oil pumping equipment has been promoted, and it has developed rapidly in recent years. First of all, starting from the improvement direction of reducing sucker rod accidents and reducing pump displacement, a series of oil production equipment products have been developed, which completely changed the working mode of oil production equipment, and many land-use equipment have been improved and applied underground. The characteristics of the downhole oil pumping equipment are: there is no sucker rod, the oil production part is placed underground from the land, and some power equipment is placed underground, and the volume of the power equipment changes greatly. Deliver the oil to the surface. By eliminating the sucker rod, the rodless oil production reduces the additional load and greatly increases the efficiency. At the same time, neither the piston rod nor the sucker rod will produce eccentric wear. It directly solves the two most important problems raised by the current development of oil production technology for oil pumping equipment, one is to increase the efficiency of oil production equipment and improve the utilization rate of power, and the other is to expand the adaptability of the pump under different reservoir conditions. At present, the rodless oil pumping equipment with mature technology and gradually wide application includes hydraulic piston pump, hydraulic jet pump, electric submersible centrifugal pump, screw pump and so on.

Among them, the downhole screw-driven oil pumping device is a new type of oil production method. It is driven by a motor, and the screw is rotated through the transmission device, and the linear reciprocating motion is output to realize oil production. The screw-driven oil production has the advantage of downhole oil pumping and saves oil Rod and many related problems, in addition to inheriting the advantages of the piston of the hydraulic piston pump, the downhole electric drive is more convenient, and there is no cumbersome multi-stage boosting of the centrifugal pump, insensitive to oil and gas, strong adaptability, and high screw transmission efficiency. However, the screw-driven pumping unit has the characteristics of high motor energy consumption and low efficiency.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention mainly overcomes the deficiencies in the prior art, and proposes a screw-driven downhole oil pumping device.

The technical solution provided by the present invention to solve the above technical problems is: a screw-driven downhole oil pumping device, comprising a lower end cover, a reversing assembly, a connecting cylinder I, a connecting cylinder II, a connecting sleeve, a rolling screw pair, an upper end cover, a reciprocating Rod, upper joint sleeve, nut joint, post, tie rod;

The reversing assembly includes a reversing shaft housing, a top tail, an upper limit assembly, a stopper, a rotary steering assembly, a lower limit assembly, a plug, and an input shaft and an output shaft axially installed in the reversing shaft housing in sequence, The top tail, the upper limit assembly and the stop block are arranged on the input shaft in sequence, and the lower limit assembly and the plug are sequentially arranged on the output shaft; tapered roller bearings are provided in the top tail and the plug ;

The lower limit assembly includes a lower pressure ring, a lower pressure rod, a top cylinder sleeved on the input shaft, a lower cylindrical bolt spring, a lower fixed cylinder ring with a radial groove, and a lower return ring; The cylindrical bolt spring and the lower return ring are both located in the lower fixed cylinder ring; one end of the lower cylindrical bolt spring is pressed on the top cylinder, and the other end is pressed against the end face of the top and tail; the lower return ring is located between the top cylinder and the block; A lower spring and a lower limit card for pressing the lower spring are arranged in the radial groove; one end of the lower pressure rod bears against the lower pressure ring, and the other end presses the lower limit card;

The rotary steering assembly includes a sleeve, a transmission cylinder, a middle support shaft, a middle transmission cylinder, a radial sliding bearing, a lower sliding bearing, a lower bevel gear installed in the lower sliding bearing, a small bevel gear, and a small bevel gear installed in the upper sliding bearing. an upper bevel gear; the transmission cylinder is sleeved on the end of the input shaft and is located in the lower bevel gear; the end of the output shaft is sequentially provided with a lower thrust bearing, a lower pressure block, a lower friction in the lower bevel gear plate and lower transmission plate; the middle transmission cylinder is sleeved on the output shaft, and the position of the output shaft close to the middle transmission cylinder is sequentially provided with an upper friction plate, an upper transmission plate, an upper pressure block, and an upper thrust bearing; The middle transmission cylinder, the upper friction plate, the upper transmission plate, the upper pressure block, and the upper thrust bearing are all located in the upper bevel gear; the lower bevel gear, the pinion bevel gear, and the upper bevel gear are sequentially engaged for transmission;

The upper limit assembly includes an upper return ring, an upper pressure rod, a pressure cylinder sleeved on the output shaft, an upper cylindrical bolt spring, an upper fixed cylinder ring with a radial groove, and an upper return ring; the pressure cylinder, the upper The cylindrical bolt spring and the upper return ring are both located in the upper fixed cylinder ring; one end of the pressing cylinder presses the upper thrust bearing; one end of the upper cylindrical bolt spring is pressed on the top, and the other end is pressed against the bottom end face of the head; the upper return The ring is located between the pressing cylinder and the sleeve; the radial groove is provided with an upper spring and an upper limit card that presses the upper spring; one end of the upper pressure rod bears against the upper return ring, and the other end presses the upper limit card ;

One end of the tie rod is connected with the upper part of the rolling screw pair, and the other end is connected with the lower pressure ring and the upper return ring respectively; one end of the pressure rod is pressed against the lower part of the rolling screw pair, and the other end is pressed on the lower return ring; the upper pressure ring is connected In the middle of the pressure rod, the output shaft is connected with the rolling screw pair through a connecting sleeve, the reciprocating rod is located in the rolling screw pair, and the other end is located in the upper joint sleeve and is connected with the post through a nut joint;

The lower end cap, the connecting cylinder I, the connecting cylinder II, the rolling screw pair, the upper end cap and the upper joint sleeve are connected in sequence.

A further technical solution is that a lower centralizing cylinder and a lower centralizing ring are arranged in the lower fixed cylinder ring.

A further technical solution is that an upper righting cylinder and an upper righting ring are arranged in the upper fixed cylinder ring.

A further technical solution is that the rolling screw pair includes a casing, a rolling screw pair screw, a rolling screw pair nut, a pressure ring, and a pull ring; the pull ring is connected with a pull rod, and the pressure rod bears the pressure ring. The connecting cylinder II is provided with a tapered roller bearing II, the rolling screw pair screw passes through the tapered roller bearing II, and is then connected to the output shaft through the connecting sleeve, and the rolling screw pair nut is connected to the rolling screw pair On the screw, the rolling screw auxiliary screw is provided with a steel ball and a ball stopper; the pressing ring and the pulling ring are respectively installed at both ends of the inner cavity of the outer casing, and the connecting cylinder II, the outer casing and the upper end cover are connected in sequence.

A further technical solution is that the lower end cover, the connecting cylinder I, the connecting cylinder II, the outer casing, the upper end cover and the upper joint sleeve are all connected by bolts.

A further technical solution is that a sealing ring is provided between the lower end cover, the connecting cylinder I, the connecting cylinder II, the outer casing, the upper end cover and the upper joint sleeve.

A further technical solution is that an O-type sealing ring I, an O-type sealing ring II, and an O-type sealing ring III are respectively provided between the lower end cover, the top tail, the top head and the input shaft.

A further technical solution is that the output shaft is provided with a jacking ring I, a washer and a jacking nut, and the jacking ring I pushes against the tapered roller bearing in the jack.

A further technical solution is that a clamping ring II for clamping the plug is provided between the connecting cylinder I and the plug.

The present invention has the following beneficial effects: the rotary power input is used in the present invention, and the reciprocating motion of the screw output drives the oil pump to produce oil; The transmission efficiency is relatively high.

Description of drawings

Fig. 1 is the structural representation of the upper part of the present invention;

Fig. 2 is the structural representation of the middle part of the present invention;

Fig. 3 is the structural representation of the lower part of the present invention;

Fig. 4 is the sectional view of N-N in the figure;

Figure 5 is a sectional view of J-J in the figure;

Fig. 6 is the sectional view of I-I in the figure;

Fig. 7 is the sectional view of H-H in the figure;

Fig. 8 is the sectional view of G-G in the figure;

Fig. 9 is the sectional view of F-F in the figure;

Figure 10 is a sectional view of E-E in the figure;

Figure 11 is a sectional view of D-D in the figure;

Fig. 12 is a sectional view taken along C-D in the drawing.

Detailed ways

The present invention will be further described below with reference to the embodiments and accompanying drawings.

As shown in Figures 1-12, a screw-driven downhole oil pumping device of the present invention includes a lower end cover 55, a reversing assembly, a connecting cylinder I21, a connecting cylinder II24, a connecting sleeve 19, a rolling screw pair, an upper end cover 58, Reciprocating rod 59, upper joint sleeve 60, nut joint 61, post 62, tie rod 22;

The reversing assembly includes a reversing shaft housing 16, a top tail 54, an upper limit assembly, a stop block 6, a rotary steering assembly, a lower limit assembly, a plug 36 and an input axially installed in the reversing shaft housing 16 in turn. The shaft 1, the output shaft 8, the top tail 54, the upper limit assembly, and the stop block 6 are sequentially arranged on the input shaft 1, and the lower limit assembly and the plug 36 are sequentially arranged on the output shaft 8; the The top tail 54 and the top head 36 are provided with tapered roller bearings 3;

The lower limit assembly includes a lower pressure ring, a lower pressure rod 51, a top cylinder sleeved on the input shaft 1, a lower cylindrical bolt spring 52, a lower fixed cylinder ring with a radial groove, and a lower return ring 50; the The top cylinder, the lower cylinder bolt spring 52 and the lower return ring 50 are all located in the lower fixed cylinder ring; one end of the lower cylinder bolt spring 52 is pressed on the top cylinder, and the other end is pressed on the end face of the top tail 54; the lower return ring 50 It is located between the top cylinder and the stopper 6; the radial groove is provided with a lower spring and a lower limit card that presses the lower spring; one end of the lower pressure rod 51 bears against the lower pressure ring, and the other end presses the lower limit Card;

The rotary steering assembly includes a sleeve 44 , a transmission cylinder 7 , a middle support shaft 9 , a middle transmission cylinder 10 , a radial sliding bearing 47 , a lower sliding bearing 49 , a lower bevel gear installed in the lower sliding bearing 49 , and a small bevel gear 46 , the upper bevel gear 45 installed in the upper sliding bearing; the transmission cylinder 7 is sleeved on the end of the input shaft 1 and located in the lower bevel gear; the end of the output shaft 8 is sequentially arranged in the lower bevel gear The lower thrust bearing, the lower pressure block, the lower friction plate, and the lower transmission plate; the middle transmission cylinder 10 is sleeved on the output shaft 8, and the output shaft 8 is adjacent to the middle transmission cylinder 10. The friction plate 11, the upper transmission plate 12, the upper pressure block 13, and the upper thrust bearing 14; the middle transmission cylinder 10, the upper friction plate 11, the upper transmission plate 12, the upper pressure block 13, and the upper thrust bearing 14 are all located on the upper Inside the bevel gear 45; the lower bevel gear, the pinion bevel gear 46, and the upper bevel gear 45 mesh and drive in sequence;

The upper limit assembly includes an upper pressure ring 37, an upper pressure rod 39, a pressure cylinder 42 sleeved on the output shaft 8, an upper cylindrical bolt spring, an upper fixed cylinder ring 38 with a radial groove, and an upper return ring; The pressing cylinder 42, the upper cylindrical bolt spring and the upper return ring are all located in the upper fixed cylinder ring 38; one end of the pressing cylinder 42 presses the upper thrust bearing 14; one end of the upper cylindrical bolt spring is pressed on 42, and the other end The upper return ring is located between the pressure cylinder 42 and the sleeve 44; the radial groove is provided with an upper spring and an upper limit card that presses the upper spring; the upper pressure rod 39 One end is against the upper pressing ring 37, and the other end is pressed against the upper limit card;

In this embodiment, the rolling screw pair includes a casing 30, a rolling screw pair screw 27, a rolling screw pair nut 28, a pressure ring 29, and a pull ring 57; the connecting cylinder II24 is provided with a tapered roller bearing II23, the The rolling screw pair screw 27 passes through the tapered roller bearing II 23, and is then connected to the output shaft 8 through the connecting sleeve 19. The connecting sleeve 19 is provided with a set screw 20 and a semicircular key 32, and the rolling screw pair nut 28 is connected A steel ball 26 and a ball stopper 25 are provided on the rolling helical auxiliary screw 27; The cylinder II 24, the outer casing 30, and the upper end cover 58 are connected in sequence;

One end of the pull rod 22 is connected with the pull ring 57, and the other end is connected with the lower pressure ring and the upper return ring; one end of the pressure rod 56 is pressed against the lower part of the pressure ring 29, and the other end is pressed on the lower return ring 50; the upper pressure The ring 37 is connected to the middle of the pressure rod 56, the output shaft 8 is connected to the rolling screw pair through the connecting sleeve 19, the reciprocating rod 59 is located in the rolling screw pair, and the other end is located in the upper joint sleeve 60 and passes through the nut joint 61. It is connected with the connecting rod 62; the lower end cover 55, the connecting cylinder I21, the connecting cylinder II24, the rolling screw pair, the upper end cover 58, and the upper joint sleeve 60 are connected in sequence.

The reversing work flow of the present invention is: the motor drives the input shaft 1 to rotate, the input shaft 1 drives the transmission cylinder 7 to rotate, the transmission cylinder 7 drives the lower bevel gear to rotate, the lower bevel gear drives the small bevel gear 46 to rotate, and the small bevel gear 46 drives the upper bevel gear to rotate. The bevel gear 45, and the external gear transmission makes the upper bevel gear and the lower bevel gear rotate in opposite directions, so as to realize the coaxial rotation in two rotation directions. The bevel gears drive the splines they drive, and this part is constantly moving. The power transmission of the input shaft 1 to the output shaft 8 requires the top cylinder and the pressing cylinder 42 to cooperate alternately. When the top cylinder withstands the transmission cylinder 7, the transmission cylinder 7 presses the lower friction plate and the lower transmission plate, and drives the output shaft 8. At this time, the pressure cylinder is in a separated state. When the pressure cylinder 42 presses the upper friction plate 11 and the upper transmission plate When the plate is 12, the top cylinder is separated, and the power of the upper bevel gear is transmitted to the output shaft 8. These are the two states of axis power switching.

As shown in FIG. 1 , the state of the present invention is that the pressure cylinder 42 acts on the clutch, and the upper bevel gear cylinder outputs power. The tie rods 22 and the pressure rods 56 are evenly distributed around the wall, which are restricted in the arc groove and can only move radially for the purpose of transmitting travel information, triggering the limit card switch and compressing the spring.

When the rolling screw pair nut 28 runs to the upper limit position, the pull ring 57 pulls the pull rod 22, the pull rod 22 goes up, the pull rod 22 drives the lower pressure ring and the upper return ring upward, the upper return ring pulls the pressure cylinder 42 upward, and the clutch power is disengaged instantly. , due to the rotational inertia of the shaft and the screw continue to rotate, the rolling screw pair nut 28 continues to rise, the pull rod 22 continues to rise, the lower pressure ring presses the pressure rod 51, the lower limit card retracts to the open state, the spring force acts on the top cylinder, the lower clutch Combined, the power of the lower bevel gear is transmitted to the output shaft 8, the rolling screw pair nut 28 goes down, and at the same time, the upper spring is compressed, the upper pressure rod 39 springs up, and the pressure cylinder 42 is restricted by the upper limit card.

When the rolling screw pair nut 28 runs to the lower limit position, the pressure ring 29 presses the pressure rod 56, the pressure rod 56 goes down, the pressure rod 56 drives the upper pressure ring 37 and the lower return ring 50 to descend, and the lower return ring 50 drives the top cylinder to descend. , the clutch power is disengaged instantaneously. Due to the inertia of the shaft and the screw, the nut continues to descend, the pressure rod 56 continues to descend, the upper pressure ring 37 presses the upper pressure rod 39, the upper limit card retracts to the open state, and the spring acts on the pressure cylinder. 42. The upper clutch is engaged, the power of the upper bevel gear cylinder is transmitted to the output shaft, the rolling screw pair nut 28 goes up, at the same time, the lower spring is compressed, the lower pressure rod 51 bounces down, and the top cylinder is restricted by the lower limit card. Continue to the next loop action.

The upper limit of the rolling screw pair nut 28 has a pull ring 57, and the downward limit has a pressure ring 29. When the rolling screw pair nut 28 goes up to the upper limit, the pull ring 57 is pushed up, and the pull ring 57 pulls the pull rod 22; the rolling screw pair nut 28 runs to When the lower limit is reached, the pressure ring 29 is pressed, and the pressure ring 29 presses the pressure rod 56 . The lower reversing device is controlled by the pressure rod 56 .

In this embodiment, in order to ensure righting, a preferred embodiment is that a lower righting cylinder 53 and a lower righting ring 5 are arranged in the lower fixed cylinder ring, and an upper righting cylinder and an upper righting ring are arranged in the upper fixed cylinder ring 38 Circle 41.

In this embodiment, in order to facilitate disassembly, a preferred embodiment is that the lower end cover 55, the connecting cylinder I21, the connecting cylinder II24, the outer shell 30, the upper end cover 58, and the upper joint sleeve 60 are all connected by bolts 31. .

In order to improve the sealing effect, a preferred embodiment is that a sealing ring 17 is provided between the lower end cover 55 , the connecting cylinder I21 , the connecting cylinder II24 , the outer casing 30 , the upper end cover 58 and the upper joint sleeve 60 . 55. The top tail 54, the top head 36 and the input shaft 1 are respectively provided with O-type sealing ring I2, O-type sealing ring II4, and O-type sealing ring III15.

A preferred implementation in this embodiment is that the output shaft 8 is provided with a clamping ring I 34 , a washer 18 , and a clamping nut 33 , and the clamping ring I presses against the tapered roller bearing 3 in the plug head 36 . , between the connecting cylinder I21 and the plug 36 is provided with a tightening ring II 35 for tightening the plug 36 .

The above is not intended to limit the present invention in any form. Although the present invention has been disclosed through the above-mentioned embodiments, it is not intended to limit the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, When the technical contents disclosed above can be used to make some changes or modifications to equivalent embodiments with equivalent changes, any simple modifications or equivalents to the above embodiments according to the technical essence of the present invention do not depart from the content of the technical solution of the present invention. Changes and modifications still fall within the scope of the technical solutions of the present invention.

Claims (9)

1. A screw-driven downhole oil pumping device, characterized in that it comprises a lower end cover (55), a reversing assembly, a connecting cylinder I (21), a connecting cylinder II (24), a connecting sleeve (19), a rolling screw pair , upper end cover (58), reciprocating rod (59), upper joint sleeve (60), nut joint (61), connecting rod (62), tie rod (22), pressure rod (56); The reversing assembly includes a reversing shaft housing (16), a top tail (54), an upper limit assembly, a stopper (6), a rotary steering assembly, a lower limit assembly, a plug head (36), and are axially mounted on the The input shaft (1) and the output shaft (8) in the reversing shaft housing (16), the top tail (54), the upper limit assembly and the stopper (6) are sequentially arranged on the input shaft (1), The lower limit assembly and the plug (36) are arranged on the output shaft (8) in sequence; the top tail (54) and the plug (36) are provided with tapered roller bearings (3); The lower limit assembly includes a lower pressure ring, a lower pressure rod (51), a top cylinder sleeved on the input shaft (1), a lower cylindrical bolt spring (52), a lower fixed cylinder ring with a radial groove, and a lower cylinder. The return ring (50); the top cylinder, the lower cylindrical bolt spring (52), and the lower return ring (50) are all located in the lower fixed cylinder ring; one end of the lower cylindrical bolt spring (52) is abutted on the top cylinder, and the other One end is pressed against the end face of the top tail (54); the lower return ring (50) is located between the top cylinder and the stopper (6); the radial groove of the lower fixed cylinder ring is provided with a lower spring and presses the lower ring The lower limit card of the spring; one end of the lower pressure rod (51) bears against the lower pressure ring, and the other end presses the lower limit card; The rotary steering assembly includes a sleeve (44), a transmission cylinder (7), a middle support shaft (9), a middle transmission cylinder (10), a radial sliding bearing (47), a lower sliding bearing (49), and is mounted on a lower sliding bearing. a lower bevel gear (49), a pinion bevel gear (46), and an upper bevel gear (45) installed in the upper sliding bearing; the transmission cylinder (7) is sleeved on the end of the input shaft (1) and is located in the lower bevel gear; the end of the output shaft (8) is sequentially provided with a lower thrust bearing, a lower pressure block, a lower friction plate, and a lower transmission plate located in the lower bevel gear; the middle transmission cylinder (10) The output shaft (8) is sleeved on the output shaft (8), and an upper friction plate (11), an upper transmission plate (12), and an upper pressing block (13) are sequentially arranged at the position of the output shaft (8) close to the middle transmission cylinder (10). ), the upper thrust bearing (14); the middle transmission cylinder (10), the upper friction plate (11), the upper transmission plate (12), the upper pressure block (13), and the upper thrust bearing (14) are all located on the upper Inside the bevel gear (45); the lower bevel gear, the small bevel gear (46), and the upper bevel gear (45) are sequentially engaged for transmission; The upper limit assembly includes an upper pressure ring (37), an upper pressure rod (39), a pressure cylinder (42) sleeved on the output shaft (8), an upper cylindrical bolt spring, and an upper fixed cylinder with a radial groove The ring (38) and the upper return ring; the pressure cylinder (42), the upper cylindrical bolt spring and the upper return ring are all located in the upper fixed cylinder ring (38); one end of the pressure cylinder (42) presses the upper thrust bearing (14); one end of the upper cylindrical bolt spring is pressed on the pressure cylinder (42), and the other end is pressed against the bottom end surface of the head (36); the upper return ring is located between the pressure cylinder (42) and the sleeve (44) The upper spring and the upper limit card pressing the upper spring are provided in the radial groove of the upper fixed cylinder ring; bit card; The output shaft (8) is connected with the rolling screw pair through a connecting sleeve (19), the reciprocating rod (59) is located in the rolling screw pair, and the other end is located in the upper joint sleeve (60) and passes through the nut joint (61) ) is connected with the post (62); One end of the tie rod (22) is connected with the upper part of the rolling screw pair, and the other end is connected with the lower pressing ring and the upper return ring respectively; one end of the pressing rod (56) is pressed against the lower part of the rolling screw pair, and the other end is pressed against the lower return ring (50). ); the upper pressure ring (37) is connected to the middle of the pressure rod (56); the lower end cover (55), the connecting cylinder I (21), the connecting cylinder II (24), the rolling screw pair, the upper end cover (58) ) and the upper joint sleeve (60) are connected in sequence. 2 . The screw-driven downhole oil pumping device according to claim 1 , wherein a lower centralizing cylinder ( 53 ) and a lower centralizing ring ( 5 ) are arranged in the lower fixed cylinder ring. 3 . 3 . The screw-driven downhole oil pumping device according to claim 2 , characterized in that, the upper fixing cylinder ring ( 38 ) is provided with an upper centralizing cylinder and an upper centralizing ring ( 41 ). 4 . 4. The screw-driven downhole oil pumping device according to claim 1, wherein the rolling screw pair comprises a casing (30), a rolling screw pair screw (27), a rolling screw pair nut (28), a pressure screw A ring (29), a pull ring (57), the pull ring (57) is connected with the pull rod (22), the pressure rod (56) is against the pressure ring (29); the connecting cylinder II (24) There is a tapered roller bearing II (23) inside, the rolling screw sub-screw (27) passes through the tapered roller bearing II (23), and is connected to the output shaft (8) through a connecting sleeve (19), the said The rolling screw pair nut (28) is connected to the rolling screw subsidiary screw (27), and the rolling screw subsidiary screw (27) is provided with a steel ball (26) and a ball stopper (25); the pressure ring (29) The pull rings (57) are respectively installed on both ends of the inner cavity of the casing (30), one end of the reciprocating rod (59) is in contact with the rolling screw pair nut (28), the connecting cylinder II (24), the casing ( 30), the upper end caps (58) are connected in sequence. 5. A screw-driven downhole oil pumping device according to claim 4, characterized in that the lower end cover (55), the connecting cylinder I (21), the connecting cylinder II (24), the casing (30), the upper end The cover (58) and the upper joint sleeve (60) are connected by bolts (31). 6. A screw-driven downhole oil pumping device according to claim 5, characterized in that the lower end cover (55), the connecting cylinder I (21), the connecting cylinder II (24), the casing (30), the upper end A sealing ring (17) is provided between the cover (58) and the upper joint sleeve (60). 7. A screw-driven downhole oil pumping device according to claim 1, characterized in that, an O-ring I (2), a top tail Between (54) and the input shaft (1), an O-ring II (4) is provided, and between the plug (36) and the input shaft (1) is an O-ring III (15). 8. A screw-driven downhole oil pumping device according to claim 1, wherein the output shaft (8) is provided with a jacking ring I (34), a washer (18), a jacking nut (33) ), the jacking ring I pushes the tapered roller bearing (3) in the jacking head (36). 9 . The screw-driven downhole oil pumping device according to claim 8 , wherein a clamping ring for clamping the plug ( 36 ) is provided between the connecting cylinder I ( 21 ) and the plug ( 36 ). 10 . II(35).

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