CN209875108U - Combined oil-well pump for preventing well-flushing from polluting oil layer - Google Patents

Abstract

The utility model relates to a prevent to wash well and pollute combination formula oil-well pump in oil reservoir, including oil-well pump barrel, plunger assembly, standing valve, diaphragm packer and shutoff, characterized by: the oil well pump comprises an oil well pump cylinder, a pump cylinder guide channel is arranged on the wall of the oil well pump cylinder, a radial small hole communicated with an inner cavity of the pump cylinder is connected to the upper end of the pump cylinder guide channel, the radial small hole connected to the upper end of the guide channel is communicated with the inner cavity of the pump cylinder when a plunger is at a lower dead point, an axial guide hole communicated with the guide channel is arranged on the side wall of the fixed valve, and the axial guide hole is communicated with a central hole in the lower portion of a partition plate of the fixed valve through the radial small hole in the side wall of the fixed valve to form a channel for transmitting pressure of. Has the advantages that: the utility model discloses can prevent that the flushing fluid from getting into the oil reservoir, cause the flushing fluid to leak out, avoid the oil reservoir to be polluted, improve oil well production efficiency.

Description

Combined oil-well pump for preventing well-flushing from polluting oil layer

Technical Field

The utility model belongs to the technical field of the oil recovery well-flushing, especially, relate to a prevent to wash combination formula oil-well pump that well pollutes oil reservoir.

Background

In order to prevent the adverse effect of wax precipitation and sand deposition on oil well production, well flushing is one of the maintenance measures often taken in oil fields during the production of oil wells. The oil layer pollution caused by the flushing fluid often causes that the oil well has no yield or the yield is greatly reduced within hours and days, and some wells even have to adopt workover operation to recover the production, thereby seriously affecting the production efficiency of the oil well. Various technical means are adopted in production for preventing the oil layer from being polluted by well washing, but a satisfactory effect is not obtained so far, other problems are caused while the oil layer is prevented from being polluted, the process is complex, and the cost is greatly increased. Patent publication No. 2763496Y discloses an oil reservoir protector for preventing contamination of flushing fluid, which belongs to a special oil well bore tool. At present, when a well is washed by heat, well washing liquid enters a stratum to cause pollution. The utility model provides an oil reservoir protector is formed by top connection, valve body, stay tube and lower clutch connection, and its characterized in that eccentric body arranges the inner chamber of valve body in, and eccentric body has an eccentric passageway, and eccentric body upper portion is the infundibulate spigot surface, and the eccentric body lower part is arranged in to the ball seat, and ball seat one side is eccentric passageway, and the opposite side is the inclined plane entity, and it has the inclined side opening to open on the valve body. When the wax is cleaned by hot washing, the leather cup is sealed, hot washing liquid enters the eccentric body from the annular space, the eccentric ball rolls on the ball seat, the hot washing liquid is prevented from flowing downwards, and the purpose of protecting an oil layer is achieved; during production, the produced liquid pushes the valve ball open, the valve ball rolls to the inclined surface, and the produced liquid enters the annular space through the inclined side hole. The utility model discloses prevent the pollution of well-flushing liquid to the stratum, and do not influence the test of oil well working fluid level, be applicable to the sand outlet well. The oil layer protector mainly uses a leather cup as a key component for controlling one-way flow of annular liquid of the oil sleeve. To prevent the wash fluid from entering the formation, the outer diameter of the cup is as close as possible to the inner diameter of the casing. In the process of descending the pipe column into the well, the pipe column inevitably rubs with the casing pipe, and the leather cup protrudes out of the outer diameter of the steel part, so that the pipe column is easy to damage and lose efficacy, and the success rate is very low. Patent document publication No. 104832128A discloses a pollution-free well-flushing device, comprising: the outer side of the upper end of the upper reducing joint is used for being fixed with the two-way joint; the inner side of the upper end of the connecting body is fixed with the lower end of the upper reducing joint, and an opening is formed in the side wall of the connecting body; the outer side of the upper end of the lifting short section is fixed with the lower end of the connecting body; the inner side of the upper end of the diaphragm packer is fixed with the lower end of the lifting short section; the inner side of the upper end of the upper body is fixed with the lower end of the diaphragm packer; the outer side of the upper end of the lower body is connected with the lower end of the upper body; the outer wall of the lower body is provided with a containing part in which a valve ball seat is arranged; the inner side of the upper end of the lower reducing joint is fixed with the lower end of the lower body, and the outer side of the lower end of the lower reducing joint is used for being fixed with the sand storage barrel; and the outer side of the upper end of the central tube is fixed with the inner side of the lower end of the upper reducing joint, and the lower end of the central tube extends into the lower body. In the pollution-free well flushing device disclosed in the patent document, the packer separates the oil sleeve annulus from top to bottom in the production process of an oil well, so that production data such as a working fluid level cannot be measured. The device does not indicate which packer is adopted, and the conventional packer often causes difficulty in unsealing due to water quality scaling and the like after the downhole time is long. Due to the improvement of the work such as technology, product quality, oil well maintenance and the like, the pump detection period is longer and longer, the problem of packer deblocking failure is more prominent, and the well is overhauled once the packer cannot be deblocked. Meanwhile, the device cannot realize the seam-sticking exploitation, so that the application limitation and hidden danger are great.

The oil extraction well washing needs to solve the bottleneck problem that the production efficiency of an oil well is influenced because the well washing liquid enters an oil layer to cause oil layer pollution.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome not enough among the prior art, provide a combination formula oil-well pump that prevents to wash well and pollute the oil reservoir, can stop completely that the flushing fluid gets into the oil reservoir and causes the oil reservoir to pollute, improve the production efficiency of oil well greatly.

The utility model discloses a realize above-mentioned purpose, realize through following technical scheme, a prevent to wash well and pollute combination formula oil-well pump in oil reservoir, including oil-well pump barrel, plunger assembly, standing valve, diaphragm packer and shutoff, characterized by: the oil well pump comprises an oil well pump cylinder, a pump cylinder guide channel is arranged on the wall of the oil well pump cylinder, a radial small hole communicated with an inner cavity of the pump cylinder is connected to the upper end of the pump cylinder guide channel, the radial small hole connected to the upper end of the guide channel is communicated with the inner cavity of the pump cylinder when a plunger is at a lower dead point, an axial guide hole communicated with the guide channel is arranged on the side wall of the fixed valve, and the axial guide hole is communicated with a central hole in the lower portion of a partition plate of the fixed valve through the radial small hole in the side wall of the fixed valve to form a channel for transmitting pressure of.

The fixed valve comprises a valve body, a valve ball and a valve seat, the valve ball is in contact with the valve seat to form a one-way valve structure, a central hole of the valve body is divided into a central hole at the upper part of the partition plate and a central hole at the lower part of the partition plate through a central partition plate, a radial oil inlet hole is arranged below the valve seat on the side wall of the valve body cylinder, and the oil inlet hole is communicated with the central.

The upper end face of the fixed valve is provided with an annular flow guide groove, the annular flow guide groove is communicated with an axial flow guide hole in the outer wall of the fixed valve, and the lower end of the pump barrel flow guide channel is communicated with the flow guide groove in the end face of the fixed valve.

Has the advantages that: compared with the prior art, the utility model discloses prevent to wash the well and pollute the oil reservoir: the diaphragm packer is directly connected with the fixed valve, so that the flushing fluid is separated by the diaphragm packer and directly enters the pump from the fixed valve of the pump and returns to the ground through the oil pipe, the flushing fluid can be completely prevented from entering an oil layer to cause the leakage of the flushing fluid, and the reduction of the production efficiency of an oil well caused by the pollution of the oil layer is further prevented; the operation is simple and convenient: the oil pump is put into the well as a common oil pump, and if a tail pipe or other pipe column structures are needed, the oil pump is directly connected with the plug of the combined pump; the structure is simple: only conducting drainage transformation on the basis of a common oil pump, and then connecting a diaphragm packer in series; the applicability is strong: the structure of the pipe column is the same as that of a common oil well pump pipe column, the work such as oil well liquid level test is not influenced, the block layer exploitation can be realized, and the pipe column is suitable for most oil wells.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the structure of the fixed valve of FIG. 1;

FIG. 3 is a partial schematic view of the pump prior to modification;

fig. 4 is a schematic view of an application state of the embodiment.

In the figure: 1. the oil well pump comprises an oil well pump cylinder, 2 parts of an oil well pump plunger, 3 parts of a traveling valve, 4 parts of a fixed valve, 4 parts of a valve body, 4 parts of a valve ball, 4 parts of 3 parts of a valve seat, 4 parts of an oil inlet, 4 parts of 5 parts of an upper central hole of a partition plate, 4 parts of 6 parts of a lower central hole of the partition plate, 4 parts of 7 parts of an axial diversion hole, 4 parts of 8 parts of a radial small hole of the fixed valve, 4 parts of 9 parts of a central partition plate, 5 parts of a diaphragm packer, 6 parts of 7 parts of an oil pipe gate, 8 parts of a sleeve gate, 9 parts of an oil pipe, 10 parts of a sleeve, 11 parts of an annular diversion groove, 12 parts of a plug, 13 parts of a diversion channel, 13 parts of 1 part.

Detailed Description

The following detailed description of the embodiments according to the present invention with reference to the preferred embodiments is as follows:

referring to the attached figure 1 in detail, the embodiment discloses a combined oil well pump for preventing well washing from polluting an oil layer, which comprises an oil well pump cylinder 1, a plunger assembly 2, a traveling valve 3, a fixed valve 4, a diaphragm packer 5 and a plug 12, the wall of the pump cylinder of the oil well pump is provided with a pump cylinder guide channel 13, the upper end of the pump cylinder guide channel is connected with a radial small hole 13-1 communicated with the inner cavity of the pump cylinder, the radial small hole connected with the upper end of the guide channel is arranged at a position that the radial small hole is communicated with the inner cavity of the pump cylinder when the plunger is positioned at a lower dead point, so that the plunger is just communicated with the inner cavity of the pump cylinder when the plunger is positioned at the lower dead point, the side wall of the fixed valve is provided with axial diversion holes 4-7 communicated with the diversion channel, and the axial diversion holes are communicated with a central hole at the lower part of a partition plate of the fixed valve through small radial holes 4-8 of the fixed valve on the side wall of the fixed valve to form a channel for transmitting pressure from well washing liquid in the pump barrel to the diaphragm packer. The fixed valve comprises a valve body 4-1, a valve ball 4-2 and a valve seat 4-3, wherein the valve ball is in contact with the valve seat to form a one-way valve structure, a central hole of the valve body is divided into a central hole 4-5 at the upper part of a partition plate and a central hole 4-6 at the lower part of the partition plate through a central partition plate 4-9, a radial oil inlet 4-4 is arranged on the side wall of a valve body cylinder below the valve seat, and the oil inlet is communicated with the central hole. The upper end face of the fixed valve is provided with an annular flow guide groove 11, the annular flow guide groove is communicated with axial flow guide holes 4-7 in the outer wall of the fixed valve, and the lower end of a flow guide channel of the pump cylinder is communicated with the flow guide groove in the end face of the fixed valve.

The aperture of the pump barrel flow guide channel, the axial flow guide hole and the radial small hole is 6-8 mm. The conventional machining is adopted to process a punched hole or a prefabricated long groove, and then the groove is sealed by using the conventional process to form a flow guide channel and an axial flow guide hole.

Structural design point

Transformation of an oil well pump: the plunger assembly and the traveling valve are unchanged, a radial small hole is drilled in the cylinder wall of the pump cylinder 1, an axial flow guide channel 13 is formed in the cylinder wall, the upper end of the flow guide channel is communicated with the radial small hole, and the outer side end of the radial small hole is plugged. The radial small hole position of the upper end of the flow guide channel is slightly higher than the upper part of the plunger 2 after the plunger is positioned at the lower dead point from the bottom of the pump barrel, namely, the distance from the radial small hole connected with the upper end of the flow guide channel to the bottom of the pump barrel is larger than the total length of the plunger, so that liquid in the pump barrel 1 can enter the flow guide channel 13 through the radial small hole 13-1 when the plunger is positioned at the lower dead point. After the valve body of the fixed valve is in threaded connection with the pump barrel, the flow guide channel on the wall of the pump barrel is communicated with the groove on the end face of the fixed valve, and then is communicated with the central hole at the lower part of the partition plate through the axial flow guide hole and the radial small opening on the wall of the fixed valve, so that the well washing liquid in the pump barrel can be ensured to pass through the central hole 4-6 at the lower part of the partition plate to be communicated with the.

The oil pump with flow guide channels on the wall of the pump barrel and the wall of the fixed valve barrel and the diaphragm packer connected in series form a combined oil pump structure for preventing the flushing fluid from polluting an oil layer.

The principle of pumping crude oil is the same as that of a conventional tubing pump. Namely, when the plunger moves upwards, the traveling valve is closed to drive the liquid on the upper part of the plunger to move upwards and enter an oil pipeline, meanwhile, the pressure of the inner cavity of the pump barrel below the plunger is reduced, and oil layer liquid passes through the radial oil inlet 4-4 of the fixed valve 4 to open the valve ball 4-2 and enters the pump barrel. When the plunger moves downward, the fixed valve 4 is closed, the pressure at the lower part of the plunger increases, the movable valve 3 is opened, and the liquid between the fixed valve 4 and the movable valve 3 enters the upper part of the plunger 2. And the plunger starts to move upwards after reaching the bottom dead center, and then the next pumping stroke is carried out, and the formation oil is continuously pumped into the oil pipeline.

Principle and working process for preventing oil layer pollution in well washing process

The well washing time is divided into three steps:

the first step is to press from the tubing to set the membrane packer: before well washing, the pumping unit is stopped at the bottom dead center to enable the plunger 2 to be located at the lowest end of the pump cylinder 1, the oil pipe gate 7 on one side is closed, and well washing liquid is filled into the oil pipe 9 through the oil pipe gate 6 on the other side by pump equipment on the ground to carry out pressurizing. The well washing liquid sequentially passes through a radial small hole 13-1 of the upper pump barrel wall of the plunger 2, a flow guide channel 13, a fixed valve end face groove 11, a fixed valve barrel wall flow guide channel 4-7, a fixed valve radial small hole 4-8 and a partition plate lower part center hole 4-6, and is conveyed to a central pipe of a diaphragm packer 5, the lower part of a sealing rubber barrel of the diaphragm packer is screwed with a plug 12 of a sealing port, the diaphragm packer 5 is subjected to internal liquid pressure, the sealing rubber barrel 15 gradually expands until the outer diameter of the sealing rubber barrel is tightly contacted with the inner diameter of a sleeve 10, annular spaces 14 and 16 above and below the sealing rubber barrel 15 of the diaphragm packer are separated and completely sealed, and seating;

and secondly, pressing and flushing the well from the oil sleeve annulus: after setting is finished, an oil pipe gate 7 on an oil pipe 9 is opened, flushing fluid is pumped from the upper part of an oil sleeve annulus 14 through a sleeve valve 8 by a pump, when the flushing fluid goes down to a diaphragm packer sealing rubber sleeve 15 from the oil sleeve annulus 14, the flushing fluid cannot go down and can only go through a radial oil inlet 4-4 and enter a central hole 4-5 in the upper part of a partition plate, a valve ball 4-2 is opened and enters a fixed valve 4, and the flushing fluid passes through a traveling valve 3 and a plunger assembly 2 and goes up along the interior of a pump cylinder 1 and the oil pipe 9 and returns to the ground to flush the well. Because the sealing rubber tube 15 of the diaphragm packer 5 is positioned at the lower end of the oil well pump close to the oil well pump, the flushing fluid can not go down, and then the flushing fluid is prevented from entering an oil layer.

Thirdly, recovering oil well production: after the well is washed, the sleeve gate 8 is closed, the oil well pump is normally started, and the special pump starts to pump the residual well washing liquid in the oil sleeve annulus 14. Because formation fluid cannot be replenished into the pump through the diaphragm packer 5, the fluid level in the oil jacket annulus 14 continues to drop, and the pressure in the pump barrel 1 continues to drop under the pumping action of the plunger 2. When the plunger piston moves upwards, the radial small hole 13-1 of the pump cylinder is firstly blocked, when the lower end of the plunger piston is higher than the radial small hole 13-1, the radial small hole is communicated with the inner cavity of the pump cylinder at the lower part of the plunger piston, and due to the principle of a communicating vessel, the internal liquid pressure of the diaphragm packer is the same as the liquid in the pump cylinder at the lower part of the plunger piston and can also be continuously reduced. When the pressure of the formation fluid at the lower part of the diaphragm packer 5 acted on the packer in the oil sleeve annulus 16 is higher than the pressure in the packer by a certain value, (normally, the setting pressure is 6-8Pa for the internal pressure of an oil pipe to set, and the deblocking pressure is that the formation fluid can be deblocked as long as the formation fluid of the oil well can provide 1MPa pressure), the formation fluid pressure pushes the diaphragm packer to complete deblocking. After unsealing, the oil sleeve annulus is completely communicated again, and normal oil extraction and swabbing are performed. And after the well washing is finished, directly starting the oil pumping unit to enter the oil extraction procedure.

The above detailed description of the combination pump for preventing well-flushing from polluting the oil reservoir with reference to the embodiments is illustrative and not restrictive, and several embodiments can be cited within the scope of the present invention, so that changes and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.

Claims (3)

1. The utility model provides a prevent that well-flushing pollutes combination formula oil-well pump of oil reservoir, includes oil-well pump barrel, plunger assembly, standing valve, diaphragm packer and shutoff, characterized by: the oil well pump comprises an oil well pump cylinder, a pump cylinder guide channel is arranged on the wall of the oil well pump cylinder, a radial small hole communicated with an inner cavity of the pump cylinder is connected to the upper end of the pump cylinder guide channel, the radial small hole connected to the upper end of the guide channel is communicated with the inner cavity of the pump cylinder when a plunger is at a lower dead point, an axial guide hole communicated with the guide channel is arranged on the side wall of the fixed valve, and the axial guide hole is communicated with a central hole in the lower portion of a partition plate of the fixed valve through the radial small hole in the side wall of the fixed valve to form a channel for transmitting pressure of.

2. The combination pump of claim 1, wherein the pump further comprises: the fixed valve comprises a valve body, a valve ball and a valve seat, the valve ball is in contact with the valve seat to form a one-way valve structure, a central hole of the valve body is divided into a central hole at the upper part of the partition plate and a central hole at the lower part of the partition plate through a central partition plate, a radial oil inlet hole is arranged below the valve seat on the side wall of the valve body cylinder, and the oil inlet hole is communicated with the central.

3. The combination pump of claim 1, wherein the pump further comprises: the upper end face of the fixed valve is provided with an annular flow guide groove, the annular flow guide groove is communicated with an axial flow guide hole in the outer wall of the fixed valve, and the lower end of the pump barrel flow guide channel is communicated with the flow guide groove in the end face of the fixed valve.