CN109751009B - Repeated hot-washing paraffin removal packer - Google Patents
Repeated hot-washing paraffin removal packer Download PDFInfo
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- CN109751009B CN109751009B CN201811485066.9A CN201811485066A CN109751009B CN 109751009 B CN109751009 B CN 109751009B CN 201811485066 A CN201811485066 A CN 201811485066A CN 109751009 B CN109751009 B CN 109751009B
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- packer
- setting
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- piston
- sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
- E21B33/1277—Packers; Plugs with inflatable sleeve characterised by the construction or fixation of the sleeve
Abstract
The invention provides a repeated hot-washing paraffin removal packer which comprises a compression rubber cylinder and an expansion rubber cylinder which are arranged outside a central tube along the upper and lower directions, wherein the compression rubber cylinder realizes setting when the liquid pressure in an oil tube rises, a maintaining structure is arranged to keep the compression rubber cylinder in a setting state, the expansion rubber cylinder realizes setting after flushing fluid is injected into an annular space, the flushing fluid can be injected into the annular space for flushing operation after the compression rubber cylinder is set, the flushing fluid cannot enter an oil layer, the oil layer is protected, and meanwhile, the double setting can ensure that the setting effect is more reliable. In addition, the unique annular cavity design and the unlocking structure enable the maintaining structure to be unlocked after flushing fluid enters the annular cavity, once the flushing fluid stops injecting, the compression rubber cylinder and the expansion rubber cylinder can automatically rebound, namely, the packer can realize automatic deblocking after flushing is finished, additional operations such as lifting an oil pumping pipe column are not needed, normal production of an oil well is guaranteed without interruption while flushing is finished, and meanwhile, the packer can be repeatedly used underground.
Description
The application is a divisional application of the following applications, the application date of the original application: 2016, 9/6, original application No.: 201610802750X, title of the original application: a packer.
Technical Field
The invention relates to a packer capable of repeatedly hot washing and paraffin removal.
Background
The wax deposition of oil well is a long existing problem in the oil field development process, when crude oil is pumped from underground to the ground, the temperature of the crude oil is gradually reduced due to the escape and expansion of dissolved gas, wax is crystallized and separated from the crude oil according to the size of molecular weight and then deposited on the inner wall of an oil pipe, so that a shaft becomes narrow, the yield of the oil well is reduced, and the oil pipe is blocked to stop the production of the oil well in severe cases. The hot washing wax-cleaning technology is characterized by that it utilizes the heated fluid material, such as water or oil, and utilizes the circulation of hot fluid in the shaft to transfer heat to shaft fluid so as to raise the temperature of shaft fluid and make the wax be dissolved in crude oil after it is deposited and melted, so that the goal of cleaning wax can be reached.
When the hot washing and paraffin removal operation is carried out, in order to prevent the hot washing liquid from being directly injected into an oil layer to cause oil layer pollution, a packer needs to be connected into an oil pipe and is used for sealing an oil sleeve annulus. The utility model discloses a No. CN203188969U, 2013.09.11's chinese utility model discloses a wax packer is just disclosed in the grant notice day, including the center tube, the upper portion periphery of center tube is equipped with the pneumatic cylinder, goes up the pneumatic cylinder below and is provided with packing element seat and lock sleeve, and the middle part periphery of center tube is provided with a plurality of packing elements in the below of packing element seat and lock sleeve, is provided with between the lower part periphery of center tube and the lower clutch, lower balance cylinder, goes up the lower packing element of balance cylinder body upside support, and threaded connection has the decapsulation cover between lower balance cylinder body downside and the lower clutch periphery, and the decapsulation cover is equipped with the decapsulation screw with the lower clutch periphery.
When the packer is used, the upper side of an upper joint of the packer is sequentially connected with a well flushing valve and an oil pumping pipe column, the lower end of a lower joint is connected with a one-way valve, a sieve pipe, a plug and the like, and the well flushing valve and the oil pumping pipe column are arranged at the underground position after being connected well. The working principle of the hot-washing paraffin removal packer is as follows: after the pressure in the central tube is increased, the pressure liquid enters an upper hydraulic cylinder, a setting pin on the upper hydraulic cylinder is cut off, the upper hydraulic cylinder moves downwards and pushes a rubber cylinder seat and a lock sleeve to move downwards, the rubber cylinder is longitudinally compressed and radially expanded until an annular space between the sleeve and the oil tube is separated from an oil layer and sealed, and when the pressure in the central tube reaches a set value, the lock sleeve and the inverted teeth on the outer wall of the central tube are locked in an interlocking manner. In the process, the upper balance cylinder and the lower balance cylinder balance the pressure of the lower side of the rubber cylinder and the pressure of the unsealing sleeve, so that the unsealing screw is prevented from being sheared and unsealed in advance. When the reverse circulation thermal washing paraffin removal is carried out, the thermal washing liquid enters the oil well pump through the well washing channel of the well washing valve and returns to the ground from the oil pumping pipe column, and the packer cannot be automatically unsealed in the well washing process, so that the thermal washing paraffin removal operation is realized; when the packer needs to be unsealed, the oil pumping pipe column is lifted upwards to cut an unsealing screw, the unsealing sleeve is separated from the lower connector, the rubber sleeve pushes the upper balance cylinder and the lower balance cylinder to move downwards, and therefore sealing of the oil sleeve annulus is relieved by longitudinal extension and radial contraction of the rubber sleeve, and unsealing is achieved.
Although the packer realizes the separation of the oil sleeve annulus and the oil layer and prevents the flushing fluid from polluting the underground oil layer, if the packer is applied to the occasions of oil pumping and hot-washing wax removal, the packer is unsealed by lifting the pipe column, so that the influence on the oil pumping operation is caused, and the interruption of normal production is caused. And the operation of lifting the tubular column is complex, and corresponding manpower and material resources are required to be invested. In addition, the packer is disposable, once the setting pin and the unset screw are sheared, the packer cannot be recovered, namely, the packer can only realize setting and unsetting once, if a wax precipitation section appears in the oil pipe again along with the production, the pipe column needs to be pulled out, the setting pin and the unset screw are replaced again or the packer is replaced again, the packer cannot be reused underground, and inconvenience is brought to practical application.
Disclosure of Invention
The invention aims to provide a paraffin removal packer capable of being repeatedly hot-washed, and aims to solve the problem that normal oil pumping operation is influenced when a packer is used for deblocking when a lifting pipe column in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a wax removal packer capable of being repeatedly washed by heat comprises a central tube extending in the up-down direction, a rubber tube seat and a compression rubber tube are arranged on the outer edge of the central tube up and down, a setting structure which enables the compression rubber tube to be compressed to realize setting when the liquid pressure in an oil tube rises is arranged on the wax removal packer capable of being repeatedly washed by heat, a maintaining structure which enables the compression rubber tube to maintain the setting state after the setting is realized on the compression rubber tube is also arranged on the wax removal packer capable of being repeatedly washed by heat, the maintaining structure comprises a locking sleeve which is arranged outside the central tube and connected with the setting structure and a locking ring which is arranged on the periphery of the central tube, locking teeth with upward tooth tips and downward tooth tips to realize interlocking and blocking are respectively arranged on the locking sleeve and the locking ring, the lower end of the locking sleeve is connected with the rubber tube seat, an annular cavity is formed among the locking sleeve, the central tube, the rubber tube seat and the setting structure, the locking ring is arranged in the annular cavity, and a well washing liquid inlet for allowing well washing liquid, the packer capable of repeatedly hot washing and paraffin removal further comprises an unlocking structure which can realize unlocking of the lock sleeve and the lock ring after the flushing fluid enters the annular cavity from the oil sleeve annulus through the flushing fluid inlet.
The unblock structure is including setting up the deblocking piston that is used for making the clearance that the catch can be compressed and setting up the catch below outside the center tube on the catch, and the deblocking piston is arranged in the ring chamber, and the looks remote site of deblocking piston and catch is provided with the conical surface that mutually supports when the deblocking piston goes upward so that the catch is compressed, and the deblocking piston has and goes upward so that the unblock position of catch and lock sleeve realization unblock after getting into the ring chamber through the well-flushing liquid inlet by the oil jacket annular space.
And a spring is arranged above the locking ring in the ring cavity, and the locking ring is provided with a supporting surface for supporting the spring.
The setting structure comprises an upper liquid inlet hole formed in the central pipe and an upper setting piston arranged outside the central pipe and corresponding to the upper liquid inlet hole, the upper end of the lock sleeve is connected with the upper setting piston, the upper setting piston is provided with a balance position enabling the compression rubber sleeve not to be compressed after oil enters from the upper liquid inlet hole during normal production of the oil well pump, and a setting position enabling the balance to be broken and the compression rubber sleeve to be pressed to realize setting when the liquid pressure in the oil pipe rises.
The setting structure further comprises a lower liquid inlet hole formed in the central tube and a lower setting piston arranged outside the central tube and corresponding to the lower liquid inlet hole, and the lower setting piston is provided with a maintaining position enabling the upper setting piston to be maintained at the balance position after oil enters from the lower liquid inlet hole during normal production of the oil well pump.
The upper portion of the lower setting piston is fixedly connected with the rubber barrel seat, a well washing liquid cavity is arranged between the lower setting piston and the central pipe, the well washing liquid cavity is communicated with the annular cavity, an expansion rubber barrel is arranged on the lower portion of the compression rubber barrel and the outer portion of the lower setting piston, an expansion cavity is arranged between the expansion rubber barrel and the lower setting piston, and a first through opening communicated with the well washing liquid cavity and the expansion cavity is formed in the lower setting piston.
The lower setting piston is also provided with a second through hole communicated with the well washing liquid cavity, and the lower part of the packer capable of repeatedly hot washing and paraffin removal is provided with a through hole which is staggered with the second through hole when the packer is set and is centered with the second through hole when the packer is unset so as to realize the quick rebound of the compression rubber sleeve and the expansion rubber sleeve.
The invention has the beneficial effects that: the lock sleeve is provided with a well washing liquid inlet through which well washing liquid in the air of the oil supply sleeve ring enters the annular cavity, the packer capable of repeatedly hot washing and paraffin removal further comprises an unlocking structure which can realize unlocking of the lock sleeve and the lock ring after the well washing liquid enters the annular cavity through the well washing liquid inlet from the annular space of the oil sleeve, when the packer is used, the packer capable of repeatedly hot washing and paraffin removal realizes seat sealing by means of rising of liquid pressure in an oil pipe, during well washing, high-pressure well washing liquid is injected into the oil sleeve ring in the air, the well washing liquid can enter the annular cavity through the well washing liquid inlet, and therefore the unlocking of the lock sleeve and the lock ring is realized by the unlocking structure. Because the annular cavity is formed among the lock sleeve, the central pipe, the rubber cylinder seat and the setting structure, the flushing liquid in the annular cavity can generate pressure on the periphery, on one hand, because the lock sleeve and the lock ring are unlocked, the setting structure can be restored to the state before unsetting under the pressure action of the flushing liquid, and thus, the preparation is made for the unsetting of the compressed rubber cylinder; on the other hand, the rubber cylinder seat continues to apply pressure to the compression rubber cylinder under the pressure action of the flushing fluid, so that the compression rubber cylinder can be kept in a setting state. Therefore, once the flushing fluid stops being injected, no pressure exists in the annular cavity, the compression rubber sleeve can automatically rebound, the flushing fluid can stop being injected after the flushing is completed, the packer can be automatically unset, extra operations such as lifting the oil pumping pipe column and the like are not needed, and therefore normal production of the oil well is guaranteed without interruption while the flushing is completed.
Drawings
FIG. 1 is a schematic diagram of the use of the packer of the present invention with repeated hot-washing and paraffin removal;
FIG. 2 is a block diagram of the packer of the present invention that can be repeatedly hot-washed to remove wax.
In the figure: 1. an upper joint; 2. an upper setting piston; 3. a central tube; 4. a spring; 5. a lock sleeve; 6. a locking ring; 7. a well-flushing liquid inlet; 8. unsealing the piston; 9. a communication port; 10. a rubber cylinder seat; 11. compressing the rubber cylinder; 12. expanding the rubber cylinder; 13. a lower setting piston; 14. a lower joint; 15. an upper liquid inlet hole; 16. a middle liquid inlet hole; 17. a lower liquid inlet hole; 18. an oil jacket annulus; 19. an oil pipe; 20. a well-flushing switch; 21. a packer; 22. a sleeve; 23. an oil well pump; 24. a screen pipe; 25. plugging with a thread; 26. a wax precipitation section; 27. an oil layer; 28. a first through port; 29 gaps; 30. an inner conical surface; 31. an outer conical surface; 32. a second through-port; 33. and a through hole.
Detailed Description
An embodiment of the packer capable of repeatedly hot washing and paraffin removal in the invention is shown in fig. 1-2, the packer 21 is used for sealing and separating an oil sleeve annulus and an oil layer during hot washing and paraffin removal operation, when in use, the packer 21 is connected below a paraffin precipitation section 26 of an oil pipe 19, the upper end of the packer 21 is connected with a well washing switch 20, the bottom of the oil pipe 19 is connected with an oil well pump 23, and the bottom of the oil well pump 23 is sequentially connected with a sieve pipe 24 and a plug 25.
The packer 21 comprises a central tube 3 extending in the up-down direction, and a setting structure for setting when the hydraulic pressure in the oil tube 19 rises is arranged on the packer, in this embodiment, the hydraulic pressure in the oil tube 19 rises by closing a wellhead production gate and increasing the hydraulic pressure in the oil tube, that is, the pressure in the oil tube is suppressed. The setting structure comprises an upper liquid inlet hole 15 formed in a central pipe 3 and an upper setting piston 2 arranged outside the central pipe 3 and at the position corresponding to the upper liquid inlet hole 15, the inner diameter of the upper setting piston 2 is two different diameters which are large at the top and small at the bottom, two sealing rings are respectively arranged in the two diameters, a first piston cavity is formed between the upper setting piston 2 and the central pipe 3, and the upper liquid inlet hole 15 is positioned between the upper sealing ring and the lower sealing ring and is communicated with the first piston cavity. The upper end of the lock sleeve 5 is fixedly connected with the upper setting piston 2, a rubber cylinder seat 10 is arranged below the lock sleeve 5, the rubber cylinder seat 10 is L-shaped, the vertical edge of the L-shaped rubber cylinder seat 10 is located on the inner side of the lock sleeve 5, the horizontal edge of the L-shaped rubber cylinder seat is in blocking fit with the lock sleeve 5 and used for limiting the movement limit of the lock sleeve 5 moving downwards, and the lock sleeve 5, the central pipe 3, the upper setting piston 2 and the rubber cylinder seat 10 form an annular cavity.
A compression rubber cylinder 11 is arranged below the rubber cylinder seat 10, and the upper setting piston 2 is provided with a balance position which enables the compression rubber cylinder 11 not to be compressed after oil enters the piston cavity from the upper liquid inlet hole 15 during normal production of the oil well pump, and a setting position which breaks the balance and applies pressure to the compression rubber cylinder 11 to realize setting during suppressing pressure in the oil pipe. The setting structure further comprises a lower liquid inlet hole 17 formed in the central tube 3 and a lower setting piston 13 arranged outside the central tube 3 and corresponding to the lower liquid inlet hole 17, the lower setting piston 13 is a long round sleeve body, the upper end of the lower setting piston is in threaded connection with the vertical edge of the rubber cylinder seat 10, the lower end of the lower setting piston is located at the upper portion of the lower liquid inlet hole 17, and a sealing ring is arranged on the inner circular surface of the lower end of the lower setting piston and forms sealing with the upper portion of the lower liquid inlet hole 17. The lower part of the central tube 3, which is outside the lower liquid inlet hole 17, is in threaded connection with a lower joint 14, a second piston cavity is formed between the lower setting piston 13 and the lower joint 14, the lower liquid inlet hole 17 is communicated with the second piston cavity, and the lower setting piston 13 is provided with a maintaining position for maintaining the upper setting piston 2 at the balance position after oil enters the second piston cavity from the lower liquid inlet hole 17 during normal production of the oil well pump. The upper end of the central pipe 3 is connected with an upper joint 1 through threads, and the packer is arranged in the oil pipe in series through the upper joint 1 and a lower joint 14.
The packer further comprises a retaining structure which is used for keeping the packer in a setting state after the compression packing element 11 achieves setting, the retaining structure comprises a lock sleeve 5 and a lock ring 6 fixedly arranged on the periphery of the central pipe, the lock ring 6 is located in an annular cavity, and lock teeth with upward tooth tips and downward tooth tips for achieving interlocking and blocking are arranged on the lock sleeve 5 and the lock ring 6 respectively. The spring 4 is arranged above the locking ring 6 in the ring cavity, the locking ring 6 is provided with a supporting surface for supporting the spring 4, the supporting surface is the upper end surface of the locking ring 6, and the lower end of the spring 4 is pressed against the supporting surface of the locking ring 6 after being assembled and is in a pre-compression state.
The lock sleeve 5 is provided with a flushing fluid inlet 7 for allowing flushing fluid in the air of the oil supply sleeve ring to enter the annular cavity, and the packer further comprises an unlocking structure for unlocking the lock sleeve 5 and the lock ring 6 after the flushing fluid enters the annular cavity from the annular space of the oil sleeve through the flushing fluid inlet 7. The unlocking structure comprises a gap 29 which is arranged on the locking ring 6 and used for enabling the locking ring 6 to be compressed and a deblocking piston 8 which is arranged outside the central tube 3 and is positioned below the locking ring 6, wherein the deblocking piston 8 is positioned in an annular cavity, and the deblocking piston 8 is provided with an unlocking position which enables the locking ring 6 and the locking sleeve 5 to be unlocked after well flushing fluid enters the annular cavity from an oil sleeve annulus through a well flushing fluid inlet 7. The opposite ends of the deblocking piston 8 and the locking ring 6 are respectively provided with an inner conical surface 30 and an outer conical surface 31 which cooperate with each other when the deblocking piston 8 moves upward to compress the locking ring 6, and when the gap 29 is compressed, the outer diameter of the locking ring 6 becomes smaller, and the locking teeth between the lock sleeve 5 and the locking ring 6 are released from being locked, thereby realizing unlocking. The internal diameter of deblocking piston 8 is two different diameters big-end-up, is formed with piston chamber three between deblocking piston 8 and the center tube 3, all is provided with the sealing washer on the upper and lower binding face of deblocking piston 8 and center tube 3, set up on the center tube 3 with the middle part feed liquor hole 16 between the upper and lower sealing washer of being located of the three intercommunications in piston chamber.
A well flushing liquid cavity is arranged between the lower setting piston 13 and the central pipe 3, the well flushing liquid cavity is communicated with the annular cavity, a communication port 9 is arranged at the upper end of the lower setting piston 13, an expansion rubber cylinder 12 is arranged on the lower portion of the compression rubber cylinder 11 and the outer portion of the lower setting piston 13, an expansion cavity is arranged between the expansion rubber cylinder 12 and the lower setting piston 13, and a first through port 28 communicated with the well flushing liquid cavity and the expansion cavity is formed in the lower setting piston 13.
The working principle of the packer capable of repeatedly hot washing and paraffin removal is as follows: during normal production, the oil pump 23 works, liquid in the oil pipe enters the first piston cavity through the upper liquid inlet hole 15 of the packer, downward acting force is applied to the upper setting piston 2 by the oil liquid, the upper setting piston 2 drives the lock sleeve 5 to move downwards, meanwhile, the liquid in the oil pipe enters the second piston cavity through the lower liquid inlet hole 17 of the packer, and upward acting force is applied to the lower setting piston 13 by the oil liquid. In the process, the downward acting force of the upper setting piston 2 is equal to the sum of the upward acting force of the lower setting piston 13 and the upward elastic force of the spring 4, so that the upper setting piston 2 is in a balance position, the lower setting piston 13 is in a holding position, and the compression rubber sleeve 11 is not compressed, namely the packer is in an unsetting state. At this time, the oil casing annulus 18 between the oil pipe 19 and the casing 22 is communicated with the oil layer 27, and normal liquid level measurement and other processes can be carried out.
After a period of production, a wax precipitation section 26 is formed on the inner wall of the tubing 19 due to the influence of temperature and the like, and according to actual production, the wax precipitation section 26 is generally formed at a well depth of more than 800 meters, so that the packer is put into the well along with the tubing string and is directly connected below the wax precipitation section of the tubing. The wax precipitation section 26 is formed to affect the yield of an oil well, at the moment, the operation of hot washing and wax removal is needed, a production gate of a well mouth is firstly closed, the pressure of oil in the oil pipe is improved, the pressure build-up in the oil pipe is realized, at the moment, the downward acting force of the oil acting on the upper setting piston 2 is larger than the sum of the upward acting force acting on the lower setting piston 13 and the upward elastic force of the spring 4, and the upper setting piston 2 pushes the lock sleeve 5 to move downwards. The lower end of the lock sleeve 5 is pressed against the horizontal edge of the rubber cylinder seat 10, when the lock sleeve 5 continues to move downwards, the compression rubber cylinder 11 is compressed, and the packer is in a setting state, so that the oil sleeve annulus 18 is sealed. When the lock sleeve 5 moves downwards to a certain degree, the lock teeth on the lock sleeve 5 and the lock ring 6 are mutually buckled to realize locking, so that the compression rubber sleeve 11 is prevented from rebounding after the pressure in the oil pipe is discharged in the next step, and the packer is kept in a setting state. Meanwhile, in the process, oil enters the piston cavity III from the middle liquid inlet hole 16 and pushes the deblocking piston 8 to move downwards, the deblocking piston 8 keeps a certain distance from the lock ring 6, and the deblocking piston 8 is prevented from compressing the lock ring 6 to unlock the lock sleeve 5 and the lock ring 6.
After the compression rubber cylinder 11 is set, the production gate of the well mouth is opened to keep normal production. Then, hot washing liquid, namely flushing liquid, is injected into the oil casing annular space 18, the flushing liquid firstly enters the annular cavity through a flushing liquid inlet 7 on the packer before the flushing switch 20 is opened to enable the flushing liquid to enter a wax precipitation section 26 of the oil pipe, and after the high-pressure flushing liquid enters the annular cavity, downward acting force is applied to the rubber cylinder seat 10, so that the compression rubber cylinder 11 is continuously kept in a setting state, and the lower setting piston 13 is kept at the position of a lower dead center and is still moved. Meanwhile, flushing fluid enters the flushing fluid cavity through the communication port 9, the flushing fluid in the flushing fluid cavity enters the expansion cavity through the first through port 28, and the expansion rubber barrel 12 is expanded and seat sealing is realized under the pressure action of the flushing fluid, so that double seat sealing of the packer is realized, the annular isolation of the oil sleeve is further enhanced, and the flushing fluid is prevented from polluting an oil layer. Meanwhile, in the process, the well washing liquid in the annular cavity also acts on the deblocking piston 8 and enables the deblocking piston 8 to move upwards, after the inner conical surface 30 of the deblocking piston 8 is matched with the outer conical surface 31 of the locking ring 6, under the action of the deblocking piston 8, the gap 29 on the locking ring 6 is compressed, the outer diameter of the locking ring 6 is reduced, the locking teeth between the lock sleeve 5 and the locking ring 6 are unlocked, and the lock sleeve 5 and the locking ring 6 are unlocked. Meanwhile, the flushing fluid reaches the upper part of the annular cavity, upward acting force is applied to the upper setting piston 2, after the lock sleeve 5 and the lock ring 6 are unlocked, under the dual action of the spring 4 and flushing fluid pressure, the upper setting piston 2 drives the lock sleeve 5 to move upwards, and finally the upper setting piston 2, the lock sleeve 5, the lock ring 6 and the spring 4 all recover to the original positions to prepare for compressing the rubber barrel 11 and expanding the deblocking rubber barrel 12 after the flushing pressure in the next step is removed.
After the compression rubber sleeve 11 and the expansion rubber sleeve 12 realize double setting, a well flushing switch 20 at the upper part of the packer is opened, and then well flushing fluid enters a wax precipitation section 26 of the oil pipe 19 through the well flushing switch 20, so that the hot washing and paraffin removal operation is carried out. As the well washing liquid directly enters the wax precipitation section, compared with the situation that the packer is connected to the bottom of the oil pipe, the well washing liquid can reach the wax precipitation section without passing through a long pipeline, so that the heat loss is less, the heat energy is fully utilized, the effect of hot washing and wax removal is improved, the well washing liquid is less in amount, and the hot washing and wax removal efficiency is high. Meanwhile, the packer realizes setting in advance by means of the pressure build-up in the oil pipe, and when the flushing fluid is injected into the oil sleeve ring to be empty, no flushing fluid enters an oil layer, so that zero pollution is realized, and the oil layer is protected.
After the hot washing and paraffin removal are finished, the injection of the well washing liquid is stopped, at the moment, the pressure acting on the upper parts of the rubber cylinder seat 10 and the lower setting piston 13 disappears, the pressure in the oil pipe acting on the lower part of the lower setting piston 13 is larger than the pressure in the oil sleeve annulus, the lower setting piston 13 pushes the rubber cylinder seat 10 to move upwards, the compression rubber cylinder 11 and the expansion rubber cylinder 12 are released to realize automatic deblocking, and the oil sleeve annulus is restored to be in a state of being communicated with the oil layer before well washing. In the process, in order to facilitate quick rebound of the compression rubber sleeve 11 and the expansion rubber sleeve 12, the lower part of the lower setting piston 13 is further provided with a second through port 32 communicated with the flushing fluid cavity, and the lower part of the packer is provided with a through hole 33 communicated with the second through port 32, when the packer is in a setting state, as the lower setting piston 13 descends, the second through port 32 and the through hole 33 are staggered, when flushing fluid stops being injected into the packer to be unsealed, the lower setting piston 13 ascends, and the second through port 32 and the through hole 33 are exactly centered, a part of flushing fluid in the flushing fluid cavity can also be discharged out of the packer from the second through port 32 and the through hole 33, so that the upper and lower pressures in the packer are quickly restored to be balanced, and quick rebound of the compression rubber sleeve 11 and the expansion rubber sleeve 12 is realized.
In the whole process of injecting the well-flushing fluid to carry out hot washing and paraffin removal, the oil-well pump 23 always keeps normal production and cannot influence the oil pumping operation no matter whether the expansion rubber sleeve 12 is further set or the compression rubber sleeve 11 and the expansion rubber sleeve 12 are simultaneously unsealed. That is, after the hot-washing paraffin removal operation is completed, once the injection of the well-washing liquid is stopped, the compression rubber tube 11 and the expansion rubber tube 12 are automatically unsealed at the same time, and additional operations such as lifting the oil pumping string are not needed, so that the normal production of the oil well is ensured without interruption while the hot-washing paraffin removal operation is completed. And the deblocking mode is more convenient and faster, the reaction is sensitive, the manpower and material resource investment is not needed, and the deblocking time is short.
In addition, the balance state before the packer is set, namely the balance position of the upper setting piston, is realized by the assistance of the lower setting piston, when the liquid pressure in the oil pipe rises, the upper setting piston moves downwards to apply pressure to the compression rubber cylinder, and no shearing pin is arranged between the upper setting piston and the central pipe and between the lower setting piston and the central pipe. After the flushing fluid got into the ring chamber from the oil jacket annular space, the deblocking piston went upward to make catch and lock sleeve unblock by the mode of compression catch, go up the setting piston afterwards, the lock sleeve, catch and spring all resume original state, consequently, stop to pour into when the flushing fluid, after compression packing element and expansion packing element kick-backed, the packer resumes the state before not suppressing pressure in the oil pipe completely, that is to say, the packer can used repeatedly, like this when the later stage is along with going on of production, when the wax segment appears once more in the oil pipe, directly according to above step repetitive operation can, need not play the change part with the tubular column, the application of oil pumping tubular column and packer has been made things convenient for greatly.
Of course, the structure of the packer capable of repeatedly hot washing and paraffin removal in the embodiment can also be applied to the occasions of reverse circulation well washing, and the effect that the well washing liquid stops being injected and can be automatically unsealed can be achieved.
In other embodiments of the repeatable hot wash paraffin removal packer: the pressure of the liquid in the oil pipe can be increased by pressing the oil pipe; the ring cavity can be provided with no spring, and when the upper setting piston is in a balance position, the downward acting force of the oil on the upper setting piston is equal to the upward acting force on the lower setting piston; the lower setting piston can be provided with only one first through port instead of the second through port; the external part of the lower setting piston can be provided with no expansion rubber cylinder, the packer realizes setting only by compressing the rubber cylinder, and at the moment, a hot washing liquid cavity is not needed to be arranged, and only one annular cavity is needed; the setting structure can not comprise a lower liquid inlet hole and a lower setting piston, a shearing pin can be arranged between the upper setting piston and the central pipe, when the oil well pump is normally produced, oil entering a first piston cavity is not enough to shear the shearing pin, the upper setting piston is in a balance position and cannot descend, when the pressure of liquid in the oil pipe rises, the shearing pin is sheared, the balance is broken, the upper setting piston descends to apply pressure to the compression rubber cylinder to realize setting, and the upper setting piston is in a setting position; the unlocking structure can not comprise an unlocking piston, the unlocking structure can be a shearing pin arranged between the locking ring and the central pipe, when the locking sleeve and the locking ring are locked, the resilience force of the compression rubber cylinder is not enough to shear the shearing pin, so that the compression rubber cylinder can keep a setting state, after high-pressure well washing liquid enters the annular cavity, the upward acting force of the well washing liquid on the locking ring causes the shearing pin to be sheared, and the locking sleeve and the locking ring are unlocked.
Claims (4)
1. The utility model provides a paraffin removal packer can be washed to heat repeatedly, includes the center tube that extends along upper and lower direction, is provided with packing element seat and compression packing element from top to bottom outside the center tube, can wash paraffin removal packer to be provided with on the heat repeatedly and make the compression packing element compressed in order to realize the seat structure of sealing when liquid pressure risees in the oil pipe, still be provided with on can washing paraffin removal packer repeatedly and realize the retaining structure who makes it keep the seat state after sealing at the compression packing element, its characterized in that: the maintaining structure comprises a lock sleeve positioned outside the central tube and a lock ring arranged on the periphery of the central tube, wherein lock teeth with upward tooth tips and downward tooth tips for realizing interlocking and blocking are respectively arranged on the lock sleeve and the lock ring, the lower end of the lock sleeve is connected with the rubber cylinder seat, an annular cavity is formed among the lock sleeve, the central tube, the rubber cylinder seat and the setting structure, the lock ring is positioned in the annular cavity, a well flushing liquid inlet through which well flushing liquid in the air of an oil supply sleeve ring enters the annular cavity is formed in the lock sleeve, and the packer capable of repeatedly hot washing and paraffin removal also comprises an unlocking structure for realizing unlocking of the lock sleeve and the lock ring after the well flushing liquid enters the annular cavity through the well flushing liquid inlet from the annular space of the oil sleeve; pressure is generated on the periphery after the flushing fluid enters the annular cavity, on one hand, because the lock sleeve and the lock ring are unlocked, the setting structure can be restored to the state before unsetting under the action of the pressure of the flushing fluid, and therefore preparation is made for unsetting of the compressed rubber cylinder; on the other hand, the rubber sleeve seat continues to apply pressure to the compression rubber sleeve under the pressure action of the flushing fluid, so that the compression rubber sleeve can keep a setting state, and once the flushing fluid stops injecting, no pressure exists in the annular cavity, the compression rubber sleeve can automatically rebound, so that the flushing fluid stops injecting after the flushing is completed, and the packer can be automatically unsealed; the setting structure comprises an upper liquid inlet hole arranged on the central tube and an upper setting piston arranged outside the central tube and corresponding to the upper liquid inlet hole, the upper end of the lock sleeve is connected with the upper setting piston, the upper setting piston is provided with a balance position which enables the compression rubber sleeve not to be compressed after oil enters from the upper liquid inlet hole during normal production of the oil well pump, and a setting position which breaks the balance and applies pressure to the compression rubber sleeve to realize setting when the liquid pressure in the oil tube rises; the setting structure also comprises a lower liquid inlet hole arranged on the central tube and a lower setting piston arranged outside the central tube and at the position corresponding to the lower liquid inlet hole, wherein the lower setting piston is provided with a maintaining position for maintaining the upper setting piston at the balance position after oil enters from the lower liquid inlet hole during normal production of the oil well pump; the upper portion of the lower setting piston is fixedly connected with the rubber barrel seat, a well washing liquid cavity is arranged between the lower setting piston and the central pipe, the well washing liquid cavity is communicated with the annular cavity, an expansion rubber barrel is arranged on the lower portion of the compression rubber barrel and the outer portion of the lower setting piston, an expansion cavity is arranged between the expansion rubber barrel and the lower setting piston, and a first through opening communicated with the well washing liquid cavity and the expansion cavity is formed in the lower setting piston.
2. The packer of claim 1, wherein: the unblock structure is including setting up the deblocking piston that is used for making the clearance that the catch can be compressed and setting up the catch below outside the center tube on the catch, and the deblocking piston is arranged in the ring chamber, and the looks remote site of deblocking piston and catch is provided with the conical surface that mutually supports when the deblocking piston goes upward so that the catch is compressed, and the deblocking piston has and goes upward so that the unblock position of catch and lock sleeve realization unblock after getting into the ring chamber through the well-flushing liquid inlet by the oil jacket annular space.
3. The packer of claim 1 or 2, wherein: and a spring is arranged above the locking ring in the ring cavity, and the locking ring is provided with a supporting surface for supporting the spring.
4. The packer of claim 1, wherein: the lower setting piston is also provided with a second through hole communicated with the well washing liquid cavity, and the lower part of the packer capable of repeatedly hot washing and paraffin removal is provided with a through hole which is staggered with the second through hole when the packer is set and is centered with the second through hole when the packer is unset so as to realize the quick rebound of the compression rubber sleeve and the expansion rubber sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811485066.9A CN109751009B (en) | 2016-09-06 | 2016-09-06 | Repeated hot-washing paraffin removal packer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811485066.9A CN109751009B (en) | 2016-09-06 | 2016-09-06 | Repeated hot-washing paraffin removal packer |
| CN201610802750.XA CN106437605B (en) | 2016-09-06 | 2016-09-06 | A kind of packer |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610802750.XA Division CN106437605B (en) | 2016-09-06 | 2016-09-06 | A kind of packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109751009A CN109751009A (en) | 2019-05-14 |
| CN109751009B true CN109751009B (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610802750.XA Active CN106437605B (en) | 2016-09-06 | 2016-09-06 | A kind of packer |
| CN201811485066.9A Active CN109751009B (en) | 2016-09-06 | 2016-09-06 | Repeated hot-washing paraffin removal packer |
| CN201811485067.3A Active CN109751011B (en) | 2016-09-06 | 2016-09-06 | Hot-washing paraffin removal packer |
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| CN201610802750.XA Active CN106437605B (en) | 2016-09-06 | 2016-09-06 | A kind of packer |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811485067.3A Active CN109751011B (en) | 2016-09-06 | 2016-09-06 | Hot-washing paraffin removal packer |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414199B (en) * | 2017-12-29 | 2020-05-22 | 中国海洋石油集团有限公司 | Performance testing device for visual packer rubber cylinder |
| CN109779563B (en) * | 2019-03-25 | 2023-10-20 | 天津五一泰科机电科技有限公司 | Combined oil pump for preventing well flushing from polluting oil layer |
| CN111535775B (en) * | 2020-05-21 | 2022-08-30 | 东营市华科石油科技开发有限责任公司 | Adjustable constant pressure washable well packer |
| CN111997563B (en) * | 2020-08-04 | 2022-06-24 | 中国石油化工股份有限公司 | Pump-sealing integrated water finding and blocking pipe column and moving bottom block thereof |
| CN113090222B (en) * | 2021-05-14 | 2021-09-24 | 大庆市晟威机械制造有限公司 | Oil field is packer in pit |
| CN113445955B (en) * | 2021-08-09 | 2022-01-28 | 湖北福瑞得能源科技有限公司 | Multifunctional intelligent oil well hot washing stratum protector and working method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2257567Y (en) * | 1994-08-31 | 1997-07-09 | 大港石油管理局钻采工艺研究院 | Packer locking and releasing mechanism |
| CN2637716Y (en) * | 2003-07-18 | 2004-09-01 | 张子臣 | Hydraulic compression type washable well hydraulic sealing release packer |
| CN201433735Y (en) * | 2009-04-10 | 2010-03-31 | 崔朝轩 | Packer special for plugging water |
| CN201705275U (en) * | 2010-06-02 | 2011-01-12 | 中国石油天然气股份有限公司 | Washable well packer |
| US8151895B1 (en) * | 2006-02-17 | 2012-04-10 | Baker Hughes Incorporated | Eutectic salt inflated wellbore tubular patch |
| CN203559858U (en) * | 2013-10-18 | 2014-04-23 | 中国石油化工股份有限公司 | Expanding type packer |
| CN204436320U (en) * | 2014-12-23 | 2015-07-01 | 中国石油化工股份有限公司 | A kind of hydraulic releasing big orifice packer |
| CN104806194A (en) * | 2015-05-18 | 2015-07-29 | 长春市恒大石油机械有限公司 | Environment-friendly well-washable step-by-step deblocking water injection packer |
| CN204877369U (en) * | 2015-08-25 | 2015-12-16 | 中国石油化工股份有限公司 | Liquid accuse is from deblocking formula fracturing packer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2139422C1 (en) * | 1997-06-10 | 1999-10-10 | Султанов Байрак Закиевич | Jet-type apparatus for washing wells |
| CN2644664Y (en) * | 2003-09-15 | 2004-09-29 | 陈香海 | Compression packer |
| CN2693941Y (en) * | 2004-04-01 | 2005-04-20 | 张子臣 | Hydraulic compression type hydraulic undet packer capable of well cleanup |
| US8616276B2 (en) * | 2011-07-11 | 2013-12-31 | Halliburton Energy Services, Inc. | Remotely activated downhole apparatus and methods |
| CN203188969U (en) * | 2013-04-07 | 2013-09-11 | 中国石油化工股份有限公司 | Thermal washing paraffin removal packer |
| CN203321426U (en) * | 2013-05-24 | 2013-12-04 | 中国石油化工股份有限公司 | Downward strike type stuck freeing packer |
| CN204283311U (en) * | 2014-10-29 | 2015-04-22 | 中国石油天然气股份有限公司 | A kind of righting type water injection packer |
| CN105484691B (en) * | 2015-12-22 | 2018-07-13 | 中国石油天然气股份有限公司 | A kind of salvagable down-hole pressure capping tools |
-
2016
- 2016-09-06 CN CN201610802750.XA patent/CN106437605B/en active Active
- 2016-09-06 CN CN201811485066.9A patent/CN109751009B/en active Active
- 2016-09-06 CN CN201811485067.3A patent/CN109751011B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2257567Y (en) * | 1994-08-31 | 1997-07-09 | 大港石油管理局钻采工艺研究院 | Packer locking and releasing mechanism |
| CN2637716Y (en) * | 2003-07-18 | 2004-09-01 | 张子臣 | Hydraulic compression type washable well hydraulic sealing release packer |
| US8151895B1 (en) * | 2006-02-17 | 2012-04-10 | Baker Hughes Incorporated | Eutectic salt inflated wellbore tubular patch |
| CN201433735Y (en) * | 2009-04-10 | 2010-03-31 | 崔朝轩 | Packer special for plugging water |
| CN201705275U (en) * | 2010-06-02 | 2011-01-12 | 中国石油天然气股份有限公司 | Washable well packer |
| CN203559858U (en) * | 2013-10-18 | 2014-04-23 | 中国石油化工股份有限公司 | Expanding type packer |
| CN204436320U (en) * | 2014-12-23 | 2015-07-01 | 中国石油化工股份有限公司 | A kind of hydraulic releasing big orifice packer |
| CN104806194A (en) * | 2015-05-18 | 2015-07-29 | 长春市恒大石油机械有限公司 | Environment-friendly well-washable step-by-step deblocking water injection packer |
| CN204877369U (en) * | 2015-08-25 | 2015-12-16 | 中国石油化工股份有限公司 | Liquid accuse is from deblocking formula fracturing packer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109751009A (en) | 2019-05-14 |
| CN106437605B (en) | 2018-12-14 |
| CN109751011A (en) | 2019-05-14 |
| CN106437605A (en) | 2017-02-22 |
| CN109751011B (en) | 2021-02-12 |
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