CN210068102U - Oil pumping production pipe column - Google Patents

Abstract

The utility model relates to an oil recovery machinery, concretely relates to oil pumping production tubular column. The oil pumping production pipe column comprises an oil well pump and a sieve pipe, and further comprises a compensation packing device positioned below the oil well pump and the sieve pipe, wherein an oil pumping channel which is connected with the oil well pump and the sieve pipe and is communicated with a stratum is arranged in the compensation packing device, a one-way valve used for controlling fluid to flow from bottom to top in a one-way mode is arranged in the oil pumping channel, the compensation packing device comprises an oil pipe compensator and a self-sealing packer which are sequentially connected from top to bottom, the oil pipe compensator comprises an inner pipe and an outer pipe which can slide relatively up and down and are assembled in an anti-falling mode, one of the inner pipe and the outer pipe is connected with the oil well pump, the other one of the. When the well is washed, the one-way valve can prevent well washing liquid from entering the stratum, and the stratum is prevented from being polluted and damaged.

Description

Oil pumping production pipe column

Technical Field

The utility model relates to an oil recovery machinery, concretely relates to oil pumping production tubular column.

Background

In the process of oil field exploitation, a conventional production string is shown in fig. 1 and comprises an oil pipe 2, an oil well pump 3, a sieve pipe 4 and a male plug 5 which are arranged in a casing 1 and sequentially connected in series from top to bottom. During normal production, fluid in the stratum 6 enters the sieve tube 4 from the sleeve 1, and the fluid is pumped out of the ground from bottom to top in the oil pipe 2 under the action of the oil well pump 3. The wax precipitation is one of factors influencing the normal production of the oil well, and in order to ensure the normal production of the oil well, the wax precipitation oil well needs to be periodically subjected to hot washing and wax removal. When the wax is cleaned by hot washing, the common method is to inject the well-washing liquid from the oil sleeve annulus, part of the well-washing liquid enters the oil pipe 2 from the oil sleeve annulus through the sieve pipe 4, and then returns to the ground from the oil pipe 2, so that the wax block is melted and carried out of the shaft; the other part of the flushing fluid is communicated with the stratum 6 at the same time due to the oil sleeve annulus and enters the stratum 6 through the sleeve 1, so that the dosage of the flushing fluid is increased, and the pollution and the damage to the stratum 6 are more important.

And the chinese utility model patent that the publication number of granting is CN206071544U discloses a washable well's beam-pumping unit well oil production pipe column, and it specifically includes oil pipe, oil-well pump, packer and end screen plug, has the control fluid to be had the check valve of one-way conduction in oil jacket annular space to the oil pipe in the end screen plug, still is connected with the screen pipe in the below of oil-well pump, and the packer is in the below of screen pipe, is used for shutoff oil jacket annular space, and the packer is located the top in stratum. When the device is used, the oil pump pumps oil to enable formation fluid to enter the oil pump through the bottom screen plug, when a well is back-washed, hot washing liquid flows upwards from the oil sleeve annulus through the screen pipe, and the check valve in the bottom screen plug prevents the hot washing liquid from entering the formation.

This oil production string can realize normal oil pumping and hot well washing operation, however, in the oil well oil pumping process, the sucker rod drives oil-well pump reciprocating motion from top to bottom, the liquid column load of oil-well pump upper portion is in turn acted on sucker rod and oil pipe, make sucker rod, oil pipe produce the wriggling flexible even make oil pipe take place to warp, and among the prior art, fixed linking to each other between oil pipe and the packer, inevitably can drive the packer and also take place ascending removal from top to bottom when oil pipe takes place to stretch out and draw back from top to bottom, the packer removes and probably causes sealed the inefficacy, the packer sealed inefficacy can lead to hot washing to enter into the stratum in.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oil pumping production tubular column to solve among the prior art packer easily sealed inefficacy and lead to hot lotion can cause the technical problem of pollution and injury to the stratum.

In order to achieve the above purpose, the utility model discloses the technical scheme of oil pumping production tubular column is: the utility model provides an oil pumping production string, includes oil-well pump and screen pipe, still includes the compensation packing device that is located oil-well pump and screen pipe below, has the pumping channel who links to each other and communicate with the stratum with oil-well pump and screen pipe in the compensation packing device, be equipped with the check valve that is used for controlling fluid from bottom to top one-way circulation in the pumping channel, the compensation packing device includes from top to bottom consecutive oil pipe compensator and from the formula packer, oil pipe compensator includes inner tube and the outer tube that can relative slip from top to bottom and anticreep assembly, one in inner tube and the outer tube links to each other with the oil-well pump, another links to each other with from the formula packer, from the formula packer includes the leather cup that.

The utility model has the advantages that: when the self-sealing packer is connected to the inner pipe or the outer pipe of the oil pipe compensator, the self-sealing packer cannot be disturbed, and the phenomenon that the self-sealing packer moves to cause sealing failure is avoided. When the well is washed, the one-way valve can prevent well washing liquid from entering the stratum, and the stratum is prevented from being polluted and damaged. The leather cup opening up, the flushing fluid pressure is big more, and is sealed better, when going into the well under, the leather cup can with the sleeve pipe friction adduction, avoid the leather cup to sit the seal in advance, moreover, when pumping oil, the leather cup can adduction under the effect of stratum fluid to cross liquid, increase stratum fluid cross liquid volume, reduce and cross the liquid resistance. Moreover, the packing cup of the self-sealing packer is adopted to seal the oil sleeve annulus, the packer does not need to be anchored on a sleeve, the risk of well blocking is reduced, the sleeve is prevented from being damaged, the size of the self-sealing packer is small, and the self-sealing packer can be suitable for small-diameter sleeves.

Further, the check valve comprises a conical valve seat arranged on the central pipe and a valve ball capable of downwards blocking the conical valve seat. The conical valve seat is arranged on the central pipe, and the conical valve seat cannot move up and down when in use.

Further, the conical valve seat is integrally formed at the upper end of the central tube. The conical valve seat is integrally formed on the central pipe, so that the processing is simple, and the number of parts is less.

Furthermore, the compensation packing device comprises at least two stages of compensation packing units which are sequentially connected in series along the vertical direction, each compensation packing unit comprises an oil pipe compensator and a self-sealing packer which are sequentially connected from top to bottom, and the oil pipe compensator in the next stage of compensation packing unit is connected with the self-sealing packer in the previous stage. By arranging at least two stages of compensation packing units and adopting at least two oil pipe compensators and self-sealing packers, the sealing performance of the compensation packing device is further improved.

Furthermore, the one-way valves are arranged in each stage of compensation packing units. And the check valves are arranged on all levels, so that the protection is improved, and the flushing fluid is prevented from entering the stratum.

Drawings

FIG. 1 is a schematic view of a prior art oil pumping production string;

FIG. 2 is a schematic view of an embodiment of the present invention;

FIG. 3 is a schematic diagram of the two-stage compensation packing unit of FIG. 2;

1-a sleeve; 2-oil pipe; 3-oil well pump; 4-a sieve tube; 5-male plugging; 6-formation; 7-a sleeve; 8-an oil pipe; 9-oil well pump; 10-a screen pipe; 11-a compensating pack-off; 12-a compensation packing unit; 13-the formation; 14-a collar; 15-tubing compensator; 151-outer tube; 152-an inner tube; 16-upper joint; 17-a valve ball; 18-a central tube; 19-a leather cup; 20-lower joint.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The specific embodiment of the oil pumping production string of the utility model, as shown in fig. 2 and 3, the oil pumping production string in this embodiment can perform oil pumping operation, and can also perform well washing and paraffin removal on the string through hot washing liquid.

The oil pumping production pipe column comprises an oil pipe 8, an oil pump 9 and a sieve pipe 10 which are sequentially connected from top to bottom, all the components are positioned in a sleeve 7, the side wall of the sieve pipe 10 is provided with radial holes for communicating the inside and the outside of the sieve pipe, and the radial holes are used for passing liquid. A compensation packing device 11 is further connected below the sieve tube 10 in a threaded manner, and the compensation packing device 11 comprises two compensation packing units 12 which are connected in series up and down, as follows.

As shown in fig. 2, the compensating packer 11 comprises two compensating packer units 12 connected in series, and the compensating packer 11 is connected to the lower end of the screen 10 by a coupling 14. The compensation packing unit 12 includes an oil pipe compensator 15 and a self-sealing packer which are sequentially connected by threads from top to bottom, the oil pipe compensator 15 is a conventional oil pipe compensator, the oil pipe compensator 15 includes an outer pipe 151 and an inner pipe 152, the inner pipe 152 is inserted and sleeved in the outer pipe 151, the outer pipe 151 and the inner pipe 152 can relatively slide along the up-down direction and can be prevented from falling off, and the oil pipe compensator 15 is an existing conventional oil pipe compensator and is not described in detail herein. The oil pipe compensator 15 can adopt the chinese utility model patent with the publication number CN202926227U, in which the inner suspension pipe is the inner pipe in this embodiment, and the outer suspension pipe is the outer pipe in this embodiment.

In this embodiment, the self-sealing packer is an existing means, as shown in fig. 3, the self-sealing packer includes a central tube 18, an upper joint 16 is connected to an upper end thread of the central tube 18, a lower joint 20 is connected to a lower end thread of the central tube, and a cup 19 is fixed to the outside of the central tube 18. In other embodiments, a Z331 type packer may be used, or a packer of the chinese utility model patent with the publication number CN202866740U may be used. The packing cup 19 can realize one-way conduction, because the opening of the packing cup 19 is upward, fluid can pass through a channel between the packing cup 19 and the casing pipe 7 from bottom to top, but when the packing cup 19 bears pressure above, the packing cup 19 expands outwards to seal an annular space between the packing cup 19 and the casing pipe 7.

In this embodiment, the outer tube 151 of the previous compensation packing unit 12 is connected to the coupling 14 by screw thread, the inner tube 152 is connected to the upper joint 16 of the self-sealing packer of the same compensation packing unit 12, and the lower joint 20 of the self-sealing packer of the previous compensation packing unit 12 is connected to the outer tube 151 of the next compensation packing unit 12. The compensation packing device is hollow, an oil pumping channel is formed in the middle, and the oil pumping channel is connected with the sieve tube 10 and the oil well pump 9 and is communicated with the stratum 13.

In this embodiment, as shown in fig. 3, the upper end of the central tube 18 is conical with a large inner diameter at the top and a small inner diameter at the bottom, so that a conical valve seat is formed at the upper end of the central tube 18, a valve ball 17 is placed on the conical valve seat, and the upper part of the valve ball 17 can be matched with the conical valve seat when bearing pressure to block the oil pumping channel; the lower part is separated from the conical valve seat when bearing pressure, and the oil pumping channel is communicated. In this embodiment the conical valve seat and the valve ball 17 constitute a one-way valve, in other embodiments the conical valve seat may be separate from the central tube, rather than being integrally formed. In other embodiments, the check valve may be disposed in the oil pipe compensator, and the disposition form of the check valve may be changed according to actual conditions, for example, the check valve may include a valve seat, a valve ball and a pressure spring, and the pressure spring presses the valve ball against the valve seat downward.

In the process of lowering the oil pumping production string to the casing 7, the oil pipe compensator 15 is in a compressed state under the action of the friction force between the cup 19 and the casing 7 in the self-sealing packer and the downward action force of the string, the oil pipe compensator 15 is restored to a free state after the string is in place, and the inner pipe 152 and the outer pipe 151 of the oil pipe compensator 15 can slide up and down relatively.

When oil is pumped: fluid in the formation 13 flows out of the formation 13, flows upwards through the pumping channel in the compensation packing 11, enters the oil casing annulus through the sieve tube 10 and forms a working fluid level. During the upstroke, the sucker rod in the oil-well pump 9 moves upwards, the fluid is acted by the oil-well pump 9, enters the oil-well pump 9 from the sieve tube 10 and is stored in the pump cylinder of the oil-well pump 9, at the moment, the oil pipe 8 is acted by an upward force to cause the contraction of the oil pipe 8, at the moment, the outer pipe 151 of the oil pipe compensator 15 moves upwards along with the upward force, the inner pipe keeps still, and therefore the self-sealing packer is guaranteed to keep sealed. Maintaining a seal without affecting formation fluid upgoing and level monitoring.

During the down stroke, the sucker rod moves downwards, the fluid stored in the pump barrel of the oil well pump 9 flows upwards and returns to the ground through the oil pipe 8 to finish the oil pumping process, the oil pipe 8 is subjected to downward acting force to cause the oil pipe 8 to extend, the outer pipe of the oil pipe compensator 15 moves downwards along with the oil pipe, and the inner pipe is kept still, so that the self-sealing packer is guaranteed not to be damaged by friction and sealed.

When the well is washed: flushing fluid (i.e. hot flushing fluid) is injected from the casing 7 at the surface into the oil jacket annulus. The cup 19 in the self-sealing packer of the previous stage is expanded outwards by the pressure of the washing liquid and moves downwards, the outer pipe 151 of the tubing compensator 15 of the previous stage is kept still, the inner pipe moves downwards along with the self-sealing packer of the previous stage, the outer pipe 151 of the tubing compensator 15 of the next stage is also driven to move downwards, and the inner pipe 152 of the tubing compensator 15 of the next stage and the self-sealing packer of the next stage are kept still, so that the annular sealing of the oil jacket is kept. The flushing fluid can not continuously flow downwards under the action of the self-sealing packer, enters the production string from the sieve tube 10, presses the valve ball 17 to the upper end of the central tube 18 by the flushing fluid, blocks the central tube 18, can not continuously flow downwards into the stratum 13, returns to the ground from the oil tube 8 by carrying stratum fluid above the one-way valve, enters the gathering and transportation system through the field production process, and performs the later oil-gas-water separation operation. Directly returns to the ground through the oil pump 9 and the oil pipe 8, thereby achieving the purpose of well washing without polluting the stratum 13. When the device is used specifically, the sucker rod in the oil well pump 9 can be removed when the well is washed. When the well is washed, the using amount of the well washing liquid (hot washing liquid) is 1.5-2 times of the volume of the shaft according to the industrial operation standard, and the well can be efficiently washed.

The utility model discloses in, in order to improve the annular sealing performance of oil jacket, compensation packing device 11 is provided with two-stage compensation packing unit 12, and each compensation packing unit 12 all is provided with oil pipe compensator 15 and self-sealing packer, and the outer tube 151 of lower one-level oil pipe compensator 15 links to each other with the self-sealing packer of last one-level. When the self-sealing packer is used, even if the upper-stage compensation packing unit 12 moves up and down along with the oil pipe 8, the self-sealing packer of the lower stage can also ensure the annular sealing performance of the oil sleeve. The utility model discloses a two oil pipe compensation, two formula packer structures of proclaiming oneself improve tubular column stability, the increase of service life.

The oil pumping production pipe column of the utility model can meet the normal production of oil wells, and adopts the self-sealing packer, the setting mode is simple, the cost is low, the pipe column is not affected by external force during setting, the bending deformation is not generated, and the service life is long; when the well is washed, the well washing liquid circulates in the oil pipe only in the oil sleeve annulus above the packer and does not contact with the stratum, thus fundamentally preventing the well washing liquid from entering the stratum. The utility model discloses an oil pumping production tubular column simple structure utilizes opening packing cup 19 up to realize the self sealss, need not reduce the stuck well risk with packer anchoring on sleeve pipe 7, avoids causing the damage to sleeve pipe 7. The size of the self-sealing packer is small, the self-sealing packer can be suitable for casings of various sizes, and the use requirement of small-diameter casings of four inches and the like can be met.

The utility model discloses an among the oil pumping production string, because the 19 openings of leather cup up, when washing the well, 19 upside atress of leather cup, the atress is big more, expands big more outward, and sealing performance is better.

In this embodiment, each stage of compensation packing unit is provided with a check valve, and in other embodiments, only one stage of compensation packing unit may be provided with a check valve.

In this embodiment, through setting up two-stage compensation packing unit, can further improve the annular sealing performance of oil jacket, in other embodiments, the quantity of compensation packing unit can increase, certainly, when just can guaranteeing sealing performance depending on a compensation packing unit, also can only set up a compensation packing unit, the quantity of compensation packing unit can increase and decrease according to actual conditions.

In the embodiment, the outer pipe of the oil pipe compensator is connected with the upper part, the inner pipe is connected with the lower part, and in other embodiments, the positions of the outer pipe and the inner pipe can be interchanged.

Claims (5)

1. The utility model provides an oil pumping production tubular column, includes oil-well pump and screen pipe, its characterized in that: the oil pipe compensator comprises an inner pipe and an outer pipe which can slide up and down relatively and are assembled in an anti-dropping manner, one of the inner pipe and the outer pipe is connected with the oil pump, the other one is connected with the self-sealing packer, and the self-sealing packer comprises a leather cup with an upward opening.

2. An oil pumping production string as claimed in claim 1, wherein: the check valve comprises a conical valve seat arranged on the central pipe and a valve ball capable of downwards plugging the conical valve seat.

3. An oil pumping production string as claimed in claim 2, wherein: the conical valve seat is integrally formed at the upper end of the central tube.

4. An oil pumping production string according to claim 1, 2 or 3, wherein: the compensation packing device comprises at least two stages of compensation packing units which are sequentially connected in series along the up-down direction, each compensation packing unit comprises an oil pipe compensator and a self-sealing packer which are sequentially connected from top to bottom, and the oil pipe compensator in the next stage of compensation packing unit is connected with the self-sealing packer of the previous stage.

5. An oil pumping production string as claimed in claim 4, wherein: the one-way valves are arranged in each stage of compensation packing units.

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