CN206017169U - A hydraulic drive screw pump lifting device - Google Patents

Abstract

The utility model discloses a hydraulic drive screw pump lifting devices belongs to the oil well oil recovery field. The device includes: a screw motor, a transmission assembly and a screw pump which are connected in sequence from top to bottom. A power fluid channel is formed between a first bushing of the screw motor and the first screw, and the first screw is of a hollow structure and is communicated with the oil pipe. And a produced fluid channel is formed between the second bushing of the screw pump and the second screw. The main body of the transmission assembly is respectively connected to the first lining and the second lining, and the connecting column is coaxially arranged in the inner cavity of the main body and forms an annular space with the main body. The lower end of the connecting column is connected with the second screw rod, and the upper end of the connecting column is connected and communicated with the first screw rod to form an oil transportation channel. The first annular partition and the second annular partition in the annular space divide the annular space into a power liquid section, a bearing section and a produced liquid section which are independent of each other in sequence. The side wall of the main body of the power liquid section is provided with a power liquid hole, and the side wall of the connecting column of the output liquid section is provided with an output liquid hole. The device has the characteristic of high pump efficiency.

Description

A hydraulic drive screw pump lifting device

technical field

The utility model relates to the field of oil production in oil wells, in particular to a hydraulically driven screw pump lifting device.

Background technique

Progressive cavity pump is also called progressive positive displacement pump. It consists of a helical rotor and a stator with a helical surface. The rotor and the inner cavity of the stator have an interference fit to form a continuous and sealed cavity. The transmission of liquid medium is realized through the rotational movement of the rotor. Due to its small size and low working noise, the screw pump is widely used in the exploitation of crude oil with high viscosity and high sand content. When the screw pump is used for oil production, the screw pump is set in the oil layer of the oil well, and the top is connected to the driving device at the wellhead through the sucker rod, and the driving device rotates the screw pump to lift the crude oil in the oil layer to the wellhead. However, when the screw pump is used in an oil well with a large slope, serious eccentric wear will occur between the sucker rod connected to the top of the screw pump and the tubing, resulting in a short pump inspection period and low pumping efficiency. Therefore, it is very necessary to provide a screw pump lifting device suitable for oil wells with large inclinations or horizontal oil wells.

The prior art provides a hydraulically driven screw pump that does not need to be connected to a sucker rod. The hydraulically driven screw pump includes a hydraulic motor, a coupling, a screw pump, a packer, and a flower tube. The outer cylinder of the hydraulic motor passes through the The short tubular flower tube with through holes on the pipe wall is connected with the stator of the screw pump, the power output shaft of the hydraulic motor is connected with the rotor of the screw pump through a coupling, and the lower end of the screw pump is connected with a packer. When in use, connect the top of the hydraulic motor to the bottom of the tubing string, set the packer, and make the oil jacket annulus form a closed annular space. Then, inject power fluid into the hydraulic motor from the wellhead along the tubing string, driven by the power fluid, the hydraulic motor drives the screw pump to rotate, pump out the crude oil under the screw pump, and flow into the oil collar from the upper end of the screw pump through the floral tube in the air until returning to the ground. At the same time, the power fluid is discharged from the lower end of the hydraulic motor after passing through the hydraulic motor, joins the produced crude oil in the flower tube, and returns to the ground together. Crude oil and power fluid can be used after separation.

The designer finds that the prior art has at least the following technical problems:

When crude oil is exploited through the hydraulically driven screw pump provided by the prior art, convection will occur when the power fluid flowing out of the hydraulic motor and the crude oil produced by the screw pump meet in the flower tube, and the power fluid will hinder the lifting of the crude oil. As a result, the pump efficiency of the hydraulically driven screw pump is low.

Utility model content

The technical problem to be solved by the embodiment of the utility model is to provide a hydraulically driven screw pump lifting device with high pump efficiency and long pump inspection period. The specific technical solution is as follows:

The embodiment of the utility model provides a hydraulically driven screw pump lifting device, the device includes: a screw motor, a screw pump, the device also includes a transmission assembly, and the screw motor, the transmission assembly, the The screw pumps are connected sequentially from top to bottom.

Wherein, the screw motor includes: a first bush and a first screw coaxially arranged in the inner cavity of the first bush, the gap between the first screw and the first bush forms a power fluid channel, the first screw rod is a hollow helical cylinder and communicates with the oil pipe.

The screw pump includes: a second bushing and a second screw coaxially arranged in the inner cavity of the second bushing, and the gap between the second screw and the second bushing forms a production fluid channel .

The transmission assembly includes: a main body, a connecting column, a first radial bearing, a thrust bearing, and a second radial bearing. Both the main body and the connecting column are hollow tubular structures, the two ends of the main body are respectively connected to the first bush and the second bushing, and the connecting column is coaxially arranged inside the main body cavity, and forms an annular space with the body. The lower end of the connecting column is connected with the second screw rod, and the upper end is connected with the first screw rod and conducts to form an oil delivery channel. A first annular partition and a second annular partition are sequentially arranged in the annular space to sequentially divide the annular space into a power fluid section, a bearing section and a production fluid section which are independent of each other. The bearing section The first radial bearing, the thrust bearing and the second radial bearing are arranged in sequence from top to bottom inside. The power fluid section communicates with the power fluid channel, and at least one power fluid hole is provided on the side wall of the main body opposite to the power fluid section, so that the power fluid section communicates with the oil jacket annulus. The production fluid section communicates with the production fluid channel, and at least one production fluid hole is provided on the side wall of the connecting column opposite to the production fluid section, so that the production fluid section and the production fluid section are connected to each other. The oil delivery channel is connected.

Specifically, preferably, the device further includes an oil pipe collar, and the oil pipe collar is arranged on the top of the side wall of the first bush for connecting the oil pipe.

Specifically, preferably, the device further includes a tail pipe, and the tail pipe is arranged at the bottom of the side wall of the second bush to protect the second bush.

Specifically, preferably, the number of the power fluid holes is at least two, and the power fluid holes are evenly distributed around the circumference of the side wall of the main body.

Specifically, preferably, the number of the produced fluid holes is at least two, and the produced fluid holes are evenly distributed around the circumference of the side wall of the main body.

Specifically, preferably, a ring of raised steps is arranged radially outward on the side wall of the connecting column, and the thrust bearing is located on an upper end surface of the raised steps. The thrust bearing includes an upper bearing main body, a lower bearing main body, and a thrust bearing shell sleeved outside the upper bearing main body and the lower bearing main body, an annular partition is arranged in the middle of the thrust bearing shell, and the upper The bearing main body is located on the upper end surface of the annular partition, and the lower bearing main body is arranged between the lower end surface of the annular partition and the raised step.

Specifically, as a preference, two lubricating oil holes are further provided on the side wall of the main body of the transmission assembly, and the lubricating oil holes communicate with the inner cavity of the bearing section.

Specifically, preferably, sealing grooves are provided on the inner side walls of the first annular partition and the second annular partition, and sealing rings are provided in the sealing grooves.

The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

The hydraulically driven screw pump lifting device provided by the embodiment of the utility model divides the annular space of the transmission assembly into the upper power fluid section, the middle bearing section and the lower section through the first annular partition and the second annular partition. In the output fluid section, by setting a power fluid hole on the side wall of the main body of the transmission assembly, the power fluid channel in the screw motor is connected with the oil jacket annulus through the power fluid section, so that the power fluid can pass through the oil jacket annulus Enter the screw motor to drive the rotation of the screw motor. The power fluid moves from bottom to top along the power fluid channel, and finally enters the oil pipe at the upper end of the screw pump and returns to the ground. By setting the output liquid hole on the side wall of the connecting column of the transmission assembly, the output liquid channel of the screw pump is connected with the oil delivery channel through the output liquid section, so that the output liquid (that is, crude oil) in the oil well is Under the suction and transmission action of the screw pump, it moves from bottom to top along the output liquid channel, output liquid section and oil delivery channel, and finally enters the oil pipe at the upper end of the screw pump, and is mixed with the power fluid and returned to the ground to realize crude oil mining. By making the above improvements to the structure of the transmission assembly, the flow channels of the power fluid and the output fluid are changed, so that the flow direction of the power fluid and the output fluid is consistent when they are mixed in the oil pipe, that is, both of them move from bottom to top. In this way, the hindrance of the power fluid to the flowback process of the output fluid is avoided, and the impact of the liquid convection on the lifting device of the hydraulically driven screw pump is reduced, thereby prolonging the pump inspection period, and the power fluid is also used for the flowback of the output fluid Power is provided, thus increasing the pump efficiency of hydraulically driven PCP lifts. At the same time, the lifting device of the hydraulically driven screw pump is easy to use and is suitable for large-scale popularization and application.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic structural view of a hydraulically driven screw pump lifting device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a transmission assembly provided by another embodiment of the present invention.

The reference signs represent respectively:

1 screw motor,

101 First bushing,

102 first screw,

103 power fluid channel,

104 oil pipeline,

2 screw pumps,

201 Second bushing,

202 second screw,

203 production fluid channel,

3 transmission assembly,

301 subject,

3011 First annular partition,

3012 second annular partition,

3013 power fluid section,

3014 bearing section,

3015 produced liquid section,

3016 power fluid hole,

3017 Grease hole,

302 connection post,

3021 Production fluid hole,

3022 raised steps,

303 1st radial bearing,

304 thrust bearing,

3041 upper bearing body,

3042 Lower Bearing Body,

3043 THRUST BEARING HOUSING,

305 Second radial bearing,

306 Limit nut,

307 sealing ring,

4 oil pipe coupling,

5 tailpipe.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the following will further describe the implementation of the utility model in detail.

The embodiment of the utility model provides a hydraulically driven screw pump lifting device, as shown in accompanying drawings 1 and 2, the device includes: a screw motor 1, a screw pump 2, a transmission assembly 3, and the screw motor 1 , transmission assembly 3, and screw pump 2 are connected sequentially from top to bottom.

Wherein, the screw motor 1 includes: a first bush 101 and a first screw 102 coaxially arranged in the inner cavity of the first bush 101 , the gap between the first screw 102 and the first bush 101 forms a power fluid channel 103 , the first screw rod 102 is a hollow helical cylinder and communicates with the oil pipe.

The screw pump 2 includes: a second bush 201 and a second screw 202 coaxially arranged in the inner cavity of the second bush 201 , and a gap between the second screw 202 and the second bush 201 forms a production fluid channel 203 .

The transmission assembly 3 includes: a main body 301 , a connecting column 302 , a first radial bearing 303 , a thrust bearing 304 , and a second radial bearing 305 . Both the main body 301 and the connecting post 302 are hollow tubular structures, and the two ends of the main body 301 are respectively connected with the first bushing 101 and the second bushing 201, and the connecting post 302 is coaxially arranged in the inner cavity of the main body 301, and is connected with the main body 301 forms an annular space. The lower end of the connecting column 302 is connected with the second screw rod 202 , and the upper end is connected with the first screw rod 102 to form an oil delivery channel 104 . A first annular partition 3011 and a second annular partition 3012 are sequentially arranged in the annular space to divide the annular space into a power fluid section 3013, a bearing section 3014 and a production fluid section 3015, which are independent of each other. The bearing section 3014 A first radial bearing 303 , a thrust bearing 304 and a radial bearing are arranged in sequence from top to bottom inside. The power fluid section 3013 communicates with the power fluid channel 103, and at least one power fluid hole 3016 is provided on the side wall of the main body 301 opposite to the power fluid section 3013, so that the power fluid section 3013 communicates with the oil jacket annulus. The production fluid section 3015 communicates with the production fluid channel 203, and at least one production fluid hole 3021 is provided on the side wall of the connecting column 302 opposite to the production fluid section 3015, so that the production fluid section 3015 and the oil delivery channel 104 connected.

The hydraulically driven screw pump lifting device provided by the embodiment of the utility model divides the annular space of the transmission assembly 3 into the upper power fluid section 3013 and the middle bearing through the first annular partition 3011 and the second annular partition 3012 Section 3014 and the lower production fluid section 3015, by setting power fluid holes 3016 on the side wall of the main body 301 of the transmission assembly 3, the power fluid channel 103 in the screw motor 1 is connected to the oil jacket annulus through the power fluid section 3013 Through, so that the power fluid can enter the screw motor 1 through the oil jacket annulus to drive the rotation of the screw motor 1. The power fluid moves from bottom to top along the power fluid passage 103, and finally enters the oil pipe at the upper end of the screw pump 2 and is discharged back to the ground. By setting the production fluid hole 3021 on the side wall of the connecting column 302 of the transmission assembly 3, the production fluid channel 203 of the screw pump 2 is connected with the oil delivery channel 104 through the production fluid section 3015, so that the production fluid in the oil well Under the suction and transmission of the screw pump 2, the output liquid (ie crude oil) moves from bottom to top along the output liquid channel 203, the output liquid section 3015 and the oil delivery channel 104, and finally enters the oil pipe at the upper end of the screw pump 2, and After being mixed with power fluid, it is returned to the ground to realize the exploitation of crude oil. By making the above improvements to the structure of the transmission assembly 3, the flow channels of the power fluid and the production fluid are changed, so that the flow direction of the power fluid and the production fluid is consistent when they are mixed in the oil pipe, that is, both of them move from bottom to top , so as to avoid the impediment of the power fluid to the flowback process of the produced fluid, reduce the impact of the liquid convection on the lifting device of the hydraulically driven screw pump, thereby prolonging the pump inspection cycle, and the power fluid is also the return of the produced fluid The row provides power, thus improving the pump efficiency of the hydraulically driven screw pump lifting device. At the same time, the lifting device of the hydraulically driven screw pump is easy to use and is suitable for large-scale popularization and application.

Specifically, the screw motor 1 is the power component in the lifting device of the hydraulically driven screw pump. The power is transmitted to the transmission assembly 3 through the screw motor 1, and then the screw pump 2 is driven to rotate through the transmission assembly 3, so that the screw pump 2 is paired with each other. Suction and delivery of crude oil. The screw motor 1 includes: a first bush 101 (equivalent to a stator) and a first screw 102 (equivalent to a rotor) coaxially arranged in the inner cavity of the first bush 101, and the inner wall of the first bush 101 is provided with a The matched double thread of the first screw 102 makes the gap between the first screw 102 and the first bushing 101 form a power fluid channel 103 . The power fluid channels 103 are actually continuous closed spaces, and as the first screw 102 rotates, the closed spaces gradually move upward along the first bushing 101 . The power fluid is a liquid with a certain pressure and flow rate, which is used to drive the movement of the screw pump 2 . The power fluid in the annular space of the oil jacket flows in from the lower end of the power fluid channel 103, and the first screw 102 starts to rotate under the drive of the power fluid, thereby realizing the drive of the first screw 102 to the transmission assembly 3 and the screw pump 2. At the same time, the power The fluid gradually moves upward along the power fluid channel 103 to join the crude oil in the oil pipe at the top of the screw motor 1 and flow back to the well head of the oil well. In order to facilitate the connection between the top of the screw motor 1 and the oil pipe, the lifting device of the hydraulically driven screw pump further includes an oil pipe collar 4 which is arranged on the top of the side wall of the first bush 101 . And the inner wall of the oil pipe collar 4 is provided with an internal thread to cooperate with the external thread of the oil pipe bottom, so that the screw motor 1 and the oil pipe are threaded through the oil pipe collar 4, which is convenient for the installation and disassembly of the screw motor 1.

Specifically, the screw pump 2 is an oil extraction part in the lifting device of the hydraulically driven screw pump, and the screw pump 2 is driven by the screw motor 1 to rotate. The structure of the screw pump 2 is similar to that of the screw motor 1. The difference is that the first screw 102 in the screw motor 1 is hollow for the transportation of crude oil, while the second screw 202 in the screw pump 2 is solid and only passes through the second screw. The production fluid channel 203 between the second screw 202 (equivalent to the rotor) and the second bushing 201 (equivalent to the stator) is used to suck and transport crude oil. After the crude oil enters the first chamber between the second screw 202 and the lower end of the second bushing 201, with the rotation of the second screw 202, the first chamber gradually moves upwards to deliver the crude oil to the transmission assembly 3 and The oil pipeline 104 finally lifts the crude oil to the wellhead. In order to protect the bottom of the screw pump 2, the hydraulically driven screw pump lifting device also includes a tail pipe 5, which is arranged at the bottom of the side wall of the second bushing 201, so as to avoid contact between the bottom of the screw pump 2 and the bottom hole sand. Stone direct collision and damage, prolong the service life of the screw pump 2.

Specifically, the transmission assembly 3 is a connecting part in the lifting device of the hydraulically driven screw pump, and is used to connect the screw motor 1 and the screw pump 2 . The main body 301 of the transmission assembly 3 is equivalent to the shell, which is connected with the first bushing 101 of the screw motor 1 and the second bushing 201 of the screw pump 2 to form the outer shell of the entire hydraulically driven screw pump lifting device. The connecting column 302 of the transmission assembly 3 is equivalent to a connecting shaft, and the first screw 102 inside the screw motor 1 is connected with the second screw 202 inside the screw pump 2 through the connecting column 302, so that the first screw 102 drives the second screw 202. The second screw 202 rotates so that the screw pump 2 can work normally.

Specifically, in the hydraulically driven screw pump 2 in the prior art, the power fluid is injected from the oil pipe, the power fluid moves from top to bottom in the hydraulic motor, and the output fluid moves from bottom to top through the screw pump 2 The power fluid and the production fluid are mixed in the flower tube and then flow back to the surface through the oil jacket annulus. Since the flow direction of the power fluid and the production fluid are opposite when they are mixed, the power fluid will hinder the flowback of the production fluid. However, in the hydraulically driven screw pump lifting device provided by the embodiment of the present invention, the power fluid moves from bottom to top along the power fluid passage 103, and finally enters the oil pipe and is discharged back to the ground. The production fluid moves from bottom to top along the production fluid channel 203 and the oil delivery channel 104, and finally enters the oil pipe, and is mixed with the power fluid in the oil pipe at the top of the screw motor 1 and then returned to the ground to realize crude oil recovery. When the power fluid and the output fluid are mixed, both of them move from bottom to top, and their flow directions are consistent, thus avoiding the hindrance of the power fluid to the flowback process of the output fluid, and reducing the liquid convection to the lifting device of the hydraulically driven screw pump. The impact caused by the pump prolongs the pump inspection period, and the power fluid also provides power for the flowback of the produced fluid, thus improving the pump efficiency of the hydraulically driven screw pump lifting device.

Specifically, as shown in Figure 2, in order to allow the power fluid to enter the power fluid channel 103 of the screw motor 1 through the oil jacket annulus, at least one power fluid hole 3016 is provided on the side wall of the main body 301 of the transmission assembly 3, preferably There are at least two power fluid holes 3016, specifically 2, 3, 4, 5, etc., and a plurality of power fluid holes 3016 are evenly distributed on the circumference of the side wall of the main body 301, so as to ensure the strength of the main body 301 Basically, the power fluid can enter the power fluid channel 103 evenly and quickly. At the same time, a first annular spacer 3011 and a second annular spacer 3012 are arranged in the annular space formed by the main body 301 of the transmission assembly 3 and the connecting column 302, through which the annular The space is sequentially divided into mutually independent power fluid section 3013, bearing section 3014 and output fluid section 3015, so that the power fluid flowing in the power fluid hole 3016 enters the power fluid section 3013, and moves upward along the power fluid section 3013 to enter the power The liquid channel 103 further drives the first screw 102 of the screw motor 1 to realize the rotation of the screw motor 1 .

Specifically, in order to allow the production fluid to enter the oil delivery channel 104 from the production fluid channel 203, at least one production fluid hole 3021 is provided on the side wall of the connecting column 302 of the transmission assembly 3, preferably at least two output fluid holes 3021 The liquid holes 3021 can specifically be 2, 3, 4, 5, etc., and a plurality of output liquid holes 3021 are evenly distributed on the circumference of the side wall of the connecting column 302, so that the output liquid can enter evenly and quickly. Oil channel 104. The output fluid moves from bottom to top along the output fluid channel 203 of the screw pump 2, and enters the output fluid section 3015 of the transmission assembly 3. After the output fluid hole 3021 is set, the output fluid section 3015 is connected to the oil delivery channel 104 so that the production fluid can enter the oil delivery channel 104 and be lifted to the ground through the oil pipe to realize the exploitation of crude oil. In addition, in order to make the fluid in the transmission assembly 3 flow smoothly and reduce the impact of the liquid on the side walls of the main body 301 and the connecting column 302, the power fluid holes 3016 and the output fluid holes 3021 are arranged in a staggered manner to avoid the sidewalls of the main body 301 and the connecting column 302. The uneven force on the wall ensures the long-term use of the transmission assembly 3 .

Specifically, since the upper part of the annular space of the transmission assembly 3 needs to communicate with the power fluid channel 103, the lower part needs to communicate with the production fluid channel 203, and the first radial bearing 303, thrust bearing 304 and The second radial bearing 305, therefore, under the premise of ensuring strength, the annular space should have as large a volume as possible. Therefore, the outer diameter of the connecting column 302 should be smaller than the outer diameters of the first screw 102 and the second screw 202, so that the power fluid and the output fluid can smoothly enter the power fluid channel 103 and the output fluid channel 203, ensuring that the screw motor has a pair of The drive of the screw pump 2 and the delivery of crude oil by the screw pump 2.

Specifically, in order to realize the rotation of the connecting column 302 in the main body 301, a bearing segment 3014 is arranged in the annular space of the main body 301, and a first radial bearing 303, a thrust bearing 304 and a second radial bearing 303 are sequentially arranged in the bearing segment 3014. To the bearing 305. Wherein, the first radial bearing 303 is set on the outside of the connecting column 302 of the power fluid section 3013 to bear the radial load of the power fluid section 3013 and ensure the rotation of the connecting column 302 in the power fluid section 3013 . The second radial bearing 305 is sleeved on the outside of the connecting column 302 of the produced fluid section 3015 to bear the radial load of the produced fluid section 3015 and ensure the rotation of the connecting column 302 in the produced fluid section 3015 . The thrust bearing 304 is located between the first radial bearing 303 and the second radial bearing 305 and is used to bear the axial load of the connecting column 302 and ensure the axial strength of the connecting column 302 when it rotates. In more detail, a ring of raised steps 3022 is arranged radially outwards at the middle and lower part of the side wall of the connecting column 302, and the thrust bearing 304 is located on the upper end surface of the raised steps 3022, thereby providing support for the thrust bearing 304 through the raised steps 3022 , so that the thrust bearing 304 is firmly connected with the connecting column 302 to ensure the normal use of the thrust bearing 304 . In order to further limit the position of the thrust bearing 304, as shown in Figure 2, a limit nut 306 is also set on the connecting column 302, and the limit nut 306 is threadedly connected with the connecting column 302, and the thrust bearing is fixed by the limit nut 306. 304 is pressed on the raised step 3022 to keep the position of the thrust bearing 304 stable in the axial direction, to ensure that the thrust bearing 304 bears the axial load of the connecting column 302, so that the connecting column 302 has a higher axial force. strength.

Specifically, as shown in Figure 2, the thrust bearing 304 includes an upper bearing body 3041, a lower bearing body 3042, and a thrust bearing housing 3043 that is sleeved outside the upper bearing body 3041 and the lower bearing body 3042, and the middle part of the thrust bearing housing 3043 An annular partition is provided, the upper bearing main body 3041 and the lower bearing main body 3042 are symmetrically arranged on the upper and lower end surfaces of the annular partition, and the lower bearing main body 3042 is located between the lower end surface of the annular partition and the raised step 3022 . By arranging two rings of the bearing main body, the effect of the thrust bearing 304 bearing axial load is improved. At the same time, the first radial bearing 303 and the second radial bearing 305 also include two-ring bearing bodies and an outer casing, and the upper and lower side walls of the thrust bearing housing 3043 are respectively connected to the first radial bearing 303 and the second radial bearing. The outer casing of the bearing 305 is threaded, so that the first radial bearing 303 , the thrust bearing 304 and the second radial bearing 305 are integrated to improve the stability of each bearing and ensure the smooth rotation of the connecting column 302 .

Specifically, in order to ensure the long-term use of each bearing in the bearing section 3014, two lubricating oil holes 3017 are also provided on the side wall of the main body 301 of the transmission assembly 3, and the lubricating oil holes 3017 communicate with the inner cavity of the bearing section 3014. The lubricating oil hole 3017 can inject lubricating oil into the bearing segment 3014 . Since there is a certain gap between the bearings, each bearing can be lubricated after lubricating oil enters the annular space of the bearing section 3014, prolonging the use of the first radial bearing 303, the thrust bearing 304 and the second radial bearing 305 life, so that the connecting column 302 can rotate smoothly to ensure the smooth progress of the oil production process.

Specifically, in order to ensure the mutual independence of the power fluid section 3013, the bearing section 3014, and the production fluid section 3015, so that the power fluid and the production fluid can flow in the corresponding channels without interfering with each other, the first annular partition section 3011 and the The inner side walls of the second annular partition 3012 are provided with sealing grooves, and sealing rings 307 are arranged in the sealing grooves. Through the sealing ring 307, the first annular partition 3011 and the second annular partition 3012 are in sealing contact with the connecting column 302, so as to avoid mutual leakage of liquid between the power fluid section 3013, the bearing section 3014 and the production fluid section 3015, and make the liquid The force-driven screw pump lift maintains high pump efficiency.

Specifically, the hydraulically driven screw pump lifting device provided by the embodiment of the utility model is connected to the bottom of the oil pipe string through the oil pipe coupling 4 on the top of the screw motor 1 when in use. Inject the power fluid into the oil casing annulus at the wellhead, and the power fluid flows downward, and then enters the power fluid section 3013 and the power fluid channel 103 through the power fluid hole 3016 on the transmission assembly 3, and the power fluid drives the first screw motor 1 As the screw 102 rotates, it gradually moves upwards along the first bushing 101 , and finally reaches the tubing collar 4 . At the same time, the first screw 102 drives the second screw 202 to rotate through the connecting column 302 of the transmission assembly 3, and the screw pump 2 starts to work, pumping crude oil into the production fluid channel 203, and gradually moving upward along the second bushing 201 into the The output fluid section 3015 of the transmission assembly 3 enters the oil delivery channel 104 through the output fluid hole 3021 on the connecting column 302, and finally reaches the oil pipe coupling 4. Crude oil and power fluid meet at 4 oil pipe couplings, and the flow direction is the same, and both flow back through the oil pipe to the wellhead of the oil well to realize the recovery of crude oil.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be Included within the protection scope of the present utility model.

Claims (8)

1. a kind of hydraulic driving screw pump lifting device, described device include：Screw motor (1), screw pump (2), its feature exist In described device also includes drive assembly (3)；And screw motor (1), the drive assembly (3), the screw pump (2) From top to bottom it is sequentially connected with；

Screw motor (1) includes：First bushing (101) and be co-axially located in the first bushing (101) inner chamber One screw rod (102), the gap between the first screw rod (102) and the first bushing (101) form power fluid passage (103), the first screw rod (102) are hollow spiral cylinder, and are connected with oil pipe；

Screw pump (2) include：Second bushing (201) and be co-axially located in the second bushing (201) inner chamber second Screw rod (202), the gap between the second screw rod (202) and the second bushing (201) form production fluid passage (203)；

Drive assembly (3) include：Main body (301), connecting pole (302), the first journal bearing (303), thrust bearing (304), the second journal bearing (305)；Main body (301) and the connecting pole (302) are hollow tubular structure, described Main body (301) two ends are connected with the first bushing (101) and second bushing (201) respectively, and connecting pole (302) are same Axle is arranged in the inner chamber of the main body (301), and forms annular space with the main body (301)；Connecting pole (302) Lower end is connected with the second screw rod (202), and upper end is connected and turns on the first screw rod (102), forms oil transportation channel (104)；First annular compartment (3011) and the second annular compartment (3012) has been sequentially arranged in the annular space, will be described Annular space is sequentially divided into separate power fluid section (3013), bearing section (3014) and production fluid section (3015), described First journal bearing (303), the thrust bearing (304) and institute have from top to bottom been sequentially arranged inside bearing section (3014) State the second journal bearing (305)；Power fluid section (3013) are connected with power fluid passage (103), and with the power At least one power fluid apertures (3016) is provided with the relative main body (301) the side wall of liquid section (3013), so that the power Liquid section (3013) is connected with oil jacket annular space；Production fluid section (3015) are connected with production fluid passage (203), and with described At least one output fluid apertures (3021) is provided with the relative connecting pole (302) the side wall of production fluid section (3015), so that institute State production fluid section (3015) to connect with the oil transportation channel (104).

2. device according to claim 1, it is characterised in that described device also includes that tubing coupling (4), the oil pipe connect Hoop (4) is arranged on the top of the first bushing (101) side wall, for connecting the oil pipe.

3. device according to claim 1, it is characterised in that described device also includes that tail pipe (5), tail pipe (5) set Put in the bottom of the second bushing (201) side wall, for protecting the second bushing (201).

4. device according to claim 1, it is characterised in that the quantity at least two of power fluid apertures (3016), And power fluid apertures (3016) are distributed around the even circumferential of the main body (301) side wall.

5. device according to claim 1, it is characterised in that the quantity at least two of output fluid apertures (3021), And output fluid apertures (3021) are distributed around the even circumferential of the connecting pole (302) side wall.

6. device according to claim 1, it is characterised in that radially set on the side wall of connecting pole (302) A circle raised step (3022) is equipped with, described thrust bearing (304) are located at the upper surface of the raised step (3022)；

Described thrust bearing (304) include upper bearing (metal) main body (3041), lower bearing main body (3042) and are sleeved on the upper shaft Hold the outside thrust bearing shell (3043) of main body (3041) and the lower bearing main body (3042), the thrust bearing shell (3043) be provided with toroidal membrane in the middle part of, described upper bearing (metal) main body (3041) are located at the upper surface of the toroidal membrane, described under Bearing main body (3042) is arranged between the lower surface of the toroidal membrane and the raised step (3022).

7. device according to claim 1, it is characterised in that also set on main body (301) the side wall of drive assembly (3) It is equipped with two oilholes (3017), the intracavity inter-connection of oilhole (3017) and the bearing section (3014).

8. device according to claim 1, it is characterised in that first annular compartment (3011) and second annular Seal groove is provided with the madial wall of compartment (3012), sealing ring (307) in the seal groove, is provided with.