CN113216911B - Floating sieve tube - Google Patents
Floating sieve tube Download PDFInfo
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- CN113216911B CN113216911B CN202110602001.3A CN202110602001A CN113216911B CN 113216911 B CN113216911 B CN 113216911B CN 202110602001 A CN202110602001 A CN 202110602001A CN 113216911 B CN113216911 B CN 113216911B
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- 238000007667 floating Methods 0.000 title claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 238000001914 filtration Methods 0.000 claims abstract description 34
- 230000001681 protective effect Effects 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000004080 punching Methods 0.000 claims description 11
- 238000010008 shearing Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims 2
- 238000003825 pressing Methods 0.000 abstract description 30
- 238000004519 manufacturing process Methods 0.000 abstract description 28
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 239000002535 acidifier Substances 0.000 description 11
- 239000012530 fluid Substances 0.000 description 10
- 230000020477 pH reduction Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention provides a floating sieve tube which comprises a pressure sliding sleeve tube section, a filtering tube section and a short section, wherein the pressure sliding sleeve tube section comprises a central tube, a protective sleeve sleeved on the periphery of the central tube, two ends of the protective sleeve are respectively connected with the filtering tube section and the short section, a flow passage is formed between the protective sleeve and the central tube, a first through hole, a first pressing switch corresponding to the first through hole, a one-way circulation device positioned between the first through hole and the filtering tube section, the flow passage is divided into a first flow passage and a second flow passage by the one-way circulation device, and the outlet end of the one-way circulation device faces the first flow passage. The invention solves the problems that the sealing element in the prior art is easy to open by mistake, so that the central pipe cavity is not closed, the sealing elements of other screen pipe sections cannot be opened, and the production efficiency and the oil production are influenced. The invention can ensure that all the production through holes can be completely opened by only pressing after the production through holes are put in place, quickly establishes a production operation channel, improves the operation efficiency and ensures the oil production.
Description
Technical Field
The invention relates to the technical field of sand control in oil exploitation well completion, in particular to a floating sieve tube.
Background
With the continuous development of drilling technology, the large displacement horizontal well is more and more widely applied, the large displacement horizontal well has the outstanding characteristics of shallow vertical depth and large horizontal displacement, and during the operation of putting the sand control screen pipe into a well completion, the pipe column is very difficult to put due to the large friction between the screen pipe and a sleeve pipe as well as between the screen pipe and the open hole well wall. In order to safely and conveniently run the sieve tube to a preset position, a floating sieve tube running technology can be adopted. The floating sieve tube is connected with the hydraulic sliding sleeve module by utilizing the non-perforation of the base tube of the conventional sieve tube module, so that the whole central tube forms a closed cavity, the weight of the whole sieve tube column in the drilling fluid is reduced by the buoyancy generated by the closed cavity in the drilling fluid, and the problem of high friction resistance in the process of screening the tube in a highly-deviated well is solved.
Chinese patent publication No. CN112412402A discloses a pressure-open type floating sieve tube, in which a switching component is provided to seal or communicate between a second flow passage and a third flow passage, that is, the switching component is moved by pressing, the second flow passage is communicated with the third flow passage, so that a production fluid can enter the interior of a base tube through a filtering mechanism and a floating mechanism to establish a production passage, and an acidification operation can be performed through the structure.
However, the above solution also has certain drawbacks: in the process of carrying out the completion and running of the extended reach well, a plurality of floating sieve tubes are required to be connected in series to form a sieve tube group, the whole sieve tube group is required to ensure complete tightness in the running process, the scheme carries out the tightness control by pressing the switching component, the switching component on a certain section of floating sieve tube is very easy to be opened by mistake due to the phenomena of collision, friction and the like with the well wall in the actual running operation process, because the switching component is opened by pressure, under the condition that the sieve tube loses tightness, the switching components on other sections of floating sieve tubes can be opened only by pressing the middle tube under the condition that the middle tube is sealed, the sealing elements of other sieve tube sections can not be opened any more under the condition that the tightness is lost, after the running is in place, the corresponding production through holes of the floating sieve tubes of other sections can not be opened, the output of the filtering oil liquid is greatly influenced, and the whole running sieve tube group is required to be taken out and replaced again, and the well completion running operation is carried out once again, so that the production efficiency and the yield are reduced to a great extent, and the production cost is improved.
Disclosure of Invention
The invention aims to solve the problems that the sealing element structure arranged on the pressing open type floating sieve tube in the prior art is easy to open by mistake in the well completion running process, so that the central tube cavity is not closed, and the sealing elements of other sieve tube sections and the corresponding production through holes cannot be opened under the condition of no sealing, so that the production efficiency and the oil production of filtered oil are greatly influenced, and provides the floating sieve tube. The invention can realize the floating and running-in of the sieve tube which is very safe and effective, can ensure that all production through holes can be quickly and completely opened by pressing after the sieve tube is run-in place, establishes a production operation channel, improves the operation working efficiency, and simultaneously can effectively and completely open the production channel to ensure the oil production.
In order to solve the technical problems, the invention adopts the technical scheme that:
a floating sieve tube comprises a pressure sliding sleeve tube section, a filtering tube section connected with one end of the pressure sliding sleeve tube section, and a short section connected with the other end of the pressure sliding sleeve tube section, wherein the pressure sliding sleeve tube section comprises a central tube, a protective sleeve sleeved on the periphery of the central tube, one end port of the protective sleeve is connected with the outer side wall of the filtering tube section, the other end port of the protective sleeve is connected with the outer side wall of the short section, a flow channel is formed between the inner side wall of the protective sleeve and the outer side wall of the central tube, a first through hole communicated with the flow channel is formed in the side wall of the central tube, a first pressurizing switch used for controlling the communication/disconnection between the first through hole and the flow channel is sleeved on the outer wall of the central tube at a position corresponding to the first through hole, a one-way circulation device is arranged in the flow channel at a position between the first through hole and the filtering tube section, and divides the flow channel into a first flow channel capable of being communicated with the first through hole and a second flow channel communicated with the filtering tube section, the outlet end of the one-way flow device faces the first flow passage.
It should be noted that, in the actual operation process, a plurality of floating sieve tubes are required to be connected in series for running-in operation, in the operation starting process, each first pressure switch is in a closed state, the whole oil pipe is in a closed state, the floating running-in of the whole floating sieve tube can be realized by utilizing the buoyancy generated by the closed cavity of the oil pipe in the well completion fluid, the friction between the wall of the floating sieve tube and the well wall is reduced, in the running-in process, if one first pressure switch is damaged or accidentally opened, because the unidirectional circulation device has unidirectional sealing and conduction functions in the other direction, the outlet end of the unidirectional circulation device faces the first pressure switch, the sealing guarantee effect can be realized, even if the first pressure switch is damaged or accidentally opened, the inside of the whole pipeline is still in a closed state, after the first pressure switch is run in place, the first pressure switch is gradually and completely opened by pressure, releasing all the first through holes, enabling the filtering pipe section to serve as a filtering treatment section of petroleum, conducting the one-way circulation device after pressure relief, enabling oil to reach the second flow channel through the filtering pipe section, then conducting the oil to enter the first flow channel through the one-way circulation device, finally entering the central pipe through the first through holes, and establishing a production channel; on the other hand, if need carry out the layering to the oil reservoir and can cooperate and keep apart the packer and use, beat through oil pipe after accomplishing the tubular column and go into, but utilize one-way circulation device setting isolation packer, realize the oil reservoir segmentation, the separation pressure of keeping apart the packer can be greater than or be less than first pressure switch's opening pressure critical value, all does not influence the purpose that the setting keeps apart the packer.
In addition, the central tube can be an integrated circular tube or a sectional splicing circular tube, and the realization of the purpose of the invention is not affected by adopting any central tube form.
Furthermore, a second through hole communicated with the second flow channel is formed in the position, corresponding to the second flow channel, of the side wall of the central tube, and a second pressing switch for controlling the second through hole to be communicated/disconnected with/from the second flow channel is sleeved at the position, corresponding to the second through hole, of the outer wall of the central tube, wherein the opening pressure critical value of the second pressing switch is larger than that of the first pressing switch.
Like this, the setting up of second pressure switch can establish acidizing operation passageway, if need squeeze acidizing operation, because the opening pressure critical value of second pressure switch is greater than the opening pressure critical value of first pressure switch, continue to beat in the centre tube, when exceeding the pressure critical value of second pressure switch, the second pressure switch can be opened, the release of second through-hole, at this moment, through toward annotating the acidifying agent in the pipeline, the acidifying agent passes through the second through-hole and gets into the second flow path, then get into the filtration pipeline section from the second flow path, release the acidifying agent from the filtration pipeline section to the oil well, the acidizing passageway is established. It should be noted that, in the actual use process, the difference between the opening pressure critical value of the second pressing switch and the opening pressure critical value of the first pressing switch may be set to be larger, so as to ensure the stability of the actual operation; when setting up the second and suppressing the switch, also can cooperate and keep apart the packer and realize the setting, the isolation pressure value of general isolation packer needs to be less than the second and suppresses the opening pressure critical value of switch, still can realize like this through suppressing the setting isolation packer, realizes the sectionalized function of oil reservoir.
Further, first pressure switch is including the parcel live first through-hole and with center tube outer wall sliding connection's first switch cover for connect the first shear pin of first switch cover and center tube outer wall, set up the first punching press groove of opening towards first through-hole on the first switch cover, the degree of depth in first punching press groove reduces towards the direction of keeping away from one-way circulation device gradually along the axis of center tube.
Thus, the first shear pin is used as a locking element of the first switch sleeve, when the inside of the central tube is pressed, pressure acts on the first stamping groove, the depth of the first stamping groove is gradually reduced along the axis of the central tube towards the direction far away from the one-way circulation device, an inclined surface is formed in the direction far away from the one-way circulation device, the first switch sleeve is pushed towards the direction far away from the central tube and towards the direction far away from the one-way circulation device, when the pressure exceeds the critical value of the first shear pin, the first shear pin is sheared, the first switch sleeve slides towards the direction far away from the one-way circulation device, and the first through hole is released.
Further, the outer edge of the opening of the first stamping groove is provided with a first sealing element which is in sliding connection with the outer wall of the central tube. Therefore, the first sealing element is used for strengthening the sealing of the first through hole, and the sealing effect is guaranteed in the well completion running process.
Further, the second is suppressed the switch and is lived the second through-hole and with center tube outer wall sliding connection's second switch cover including the parcel for connect the second shear pin of second switch cover and center tube outer wall, set up the second punching press groove of opening towards the second through-hole on the second switch cover, the degree of depth in second punching press groove reduces towards the direction of keeping away from one-way circulation device along the axis of center tube gradually.
In this way, the second shear pin is used as a locking element of the second switch sleeve, when the inside of the central tube is pressed, pressure acts on the second stamping groove, the depth of the second stamping groove is gradually reduced along the axis of the central tube towards the direction far away from the one-way circulation device, an inclined surface is formed in the direction far away from the one-way circulation device, the second switch sleeve is pushed towards the direction far away from the central tube and towards the direction far away from the one-way circulation device, after the pressure exceeds the critical value of the second shear pin, the second shear pin is sheared, the second switch sleeve slides towards the direction far away from the one-way circulation device, the second through hole is released, and during acidification operation, an acidifying agent can be extruded through the second through hole to perform acidification operation.
Further, the second is suppressed the switch and is lived second through-hole and center tube outer wall sliding connection's second switch cover including the parcel, a second shear pin for connecting second switch cover and center tube outer wall, the expanding spring that one end and second switch cover were kept away from one side connection of one-way circulation device, and the solid fixed ring of connecting the expanding spring other end, set up the second punching press groove of opening towards first through-hole on the second switch cover, the degree of depth in second punching press groove reduces gradually towards the direction of keeping away from one-way circulation device along the axis of center tube.
Like this, after the acidizing operation is ended, the center tube pressure release, expanding spring does not have thrust and compresses it, and expanding spring is because the resilience force, pushes the second switch cover back the normal position, seals the second through-hole once more, and fluid can only get into the center tube through first through-hole again, is convenient for like this advance oil quantity's control.
Furthermore, a second sealing element which is connected with the outer wall of the central tube in a sliding manner is arranged on the outer edge of the opening of the second punching groove. Therefore, the second sealing element is used for strengthening the sealing of the second through hole and ensuring the sealing effect.
Furthermore, the filter pipe section includes the parent tube that one end and center tube are connected, connects the first coupling that overflows of the parent tube other end, overlaps the filter screen cover of establishing on the parent tube, and the filter screen cover forms the filtration passageway with the parent tube lateral wall, and the lateral wall and the protective sheath of filter screen cover are connected, and the filtration passageway communicates with the second flow channel.
It should be noted that, a support frame is generally arranged between the filter screen sleeve and the base pipe, and the support frame is connected with the base pipe to play a supporting role and prevent the filter screen sleeve from deforming so as to influence the flux of the filter passage.
Further, the short section includes that one end overflows the coupling with the second that the center tube is connected, and the second other end that overflows the coupling is connected with the short section head, and the second overflows the lateral wall of coupling and is connected with the one end port inside wall of protective sheath.
It should be noted that, when the floating sieve tube is put in the large displacement oil well, a plurality of floating sieve tubes are generally required to be combined, and the floating sieve tubes are continuously put in the large displacement oil well in an end-to-end connection mode, so that the short section and the filter pipe section of the other floating sieve tube can be mutually matched and connected through the overflowing coupling, the size of the port of the short section head can be matched with the first overflowing coupling of the filter pipe section, and the production requirement is met.
Furthermore, one-way circulation device includes the check valve, locates the outer sealing washer that is connected with the inside wall of protective sheath on the check valve and locates the inner sealing circle that is connected with the lateral wall of center tube on the check valve.
Therefore, the outer sealing ring and the inner sealing ring ensure the sealing effect of the passages on the left side and the right side of the flowing direction of the one-way valve, and ensure that oil can only enter the first flow passage from the second flow passage through the one-way valve when the production passage is established.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the first pressure switch and the one-way circulation assembly are arranged on the central pipe, the outlet end of the one-way circulation device faces the first pressure switch, and in the process of running in, the sealing guarantee function in the oil pipe cavity can be achieved through the one-way conduction function of the one-way circulation assembly.
(2) The acidizing fluid is injected into the well completion or the production operation, and then the first pressurizing switch is opened, the first through hole is opened, the acidizing fluid is squeezed out through the first through hole, and the acidizing fluid is injected into the well completion or the production operation.
Drawings
Fig. 1 is a schematic view of the overall structure of this embodiment 1.
Fig. 2 is a schematic structural view of a filter pipe segment in this example 1.
Fig. 3 is a schematic structural diagram of the pressure sliding sleeve pipe section in the embodiment 1.
FIG. 4 is a schematic flow diagram of the production channel and acidification channel in this example 1.
The graphic symbols are illustrated as follows:
1-pressure slide sleeve section, 2-filter section, 3-short section, 4-first pressure switch, 5-second pressure switch, 6-one-way flow device, 7-first flow channel, 8-second flow channel, 9-filter channel, 11-center tube, 12-first through hole, 13-second through hole, 14-protective sleeve, 15-connecting sleeve, 16-third flow collar, 17-connecting tube, 21-base tube, 22-first flow collar, 23-filter sleeve, 31-second flow collar, 32-short joint, 41-first switch sleeve, 42-first shear pin, 43-first stamping groove, 44-first seal, 51-second switch sleeve, 52-second shear pin, 53-expansion spring, 54-fixing ring, 55-second punching groove, 56-second sealing element, 61-one-way valve, 62-backing ring, 63-outer sealing ring and 64-inner sealing ring.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1 to 4, a floating sieve tube comprises a pressure sliding sleeve tube section 1, a filtering tube section 2 connected with one end of the pressure sliding sleeve tube section 1, a short section 3 connected with the other end of the pressure sliding sleeve tube section 1, the pressure sliding sleeve tube section 1 comprises a central tube 11, a protective sleeve 14 sleeved on the periphery of the central tube 11, one end port of the protective sleeve 14 is connected with the outer side wall of the filtering tube section 2, the other end port of the protective sleeve 14 is connected with the outer side wall of the short section 3, a flow passage is formed between the inner side wall of the protective sleeve 14 and the outer side wall of the central tube 11, a first through hole 12 communicated with the flow passage is formed in the side wall of the central tube 11, a first pressurizing switch 4 for controlling the communication/disconnection between the first through hole 12 and the flow passage is sleeved on the outer wall of the central tube 11 at a position corresponding to the first through hole 12, a one-way circulation device 6 is arranged in the flow passage at a position between the first through hole 12 and the filtering tube section 2, the one-way flow-through device 6 divides the flow channel into a first flow channel 7 which can communicate with the first through hole 12 and a second flow channel 8 which communicates with the filter tube section 2, the outlet end of the one-way flow-through device 6 facing the first flow channel 7.
Thus, in the actual operation process, a plurality of floating sieve pipes are required to be connected in series for running operation, in the process of starting operation, each first pressure switch 4 is in a closed state, the whole oil pipe is in a closed state, the floating running of the whole floating sieve pipe can be realized by utilizing buoyancy generated by a closed cavity of the oil pipe in well completion fluid, the friction between the wall of the floating sieve pipe and the wall of the well is reduced, in the running process, if one first pressure switch 4 is damaged or accidentally opened, because the one-way circulating device 6 has the one-way sealing function and the other direction conducting function, the outlet end of the one-way circulating device 6 faces the first pressure switch 4, the sealing guarantee effect can be realized, even if the first pressure switch 4 is damaged or accidentally opened, the inside of the whole pipeline is still in a closed state, and after the running operation is in place, the first pressure switch 4 is gradually and completely opened by pressure, the release of all the first through holes is realized, the filtering pipe section 2 is used as a filtering treatment section of petroleum, the one-way circulation device is communicated 6 after pressure relief, oil liquid reaches the second flow channel 8 through the filtering pipe section, then is communicated to enter the first flow channel 7 through the one-way circulation device 6, finally enters the central pipe 11 through the first through hole 12, and a production channel is established.
As shown in fig. 1 and 3, a second through hole 13 communicated with the second flow channel 8 is formed in a position on the side wall of the central tube 11 corresponding to the second flow channel 8, and a second on-pressure switch 5 for controlling the communication/disconnection between the second through hole 13 and the second flow channel 8 is sleeved on a position on the outer wall of the central tube 11 corresponding to the second through hole 13, wherein an on-pressure critical value of the second on-pressure switch 5 is greater than an on-pressure critical value of the first on-pressure switch 4.
Thus, the opening of the second pressing switch 5 can establish an acidification operation channel, if the acidification operation is required to be squeezed, as the opening pressure critical value of the second pressing switch 5 is far greater than that of the first pressing switch 4, the pressing in the central pipe 11 is continued, when the pressure critical value of the second pressing switch 5 is exceeded, the second pressing switch 5 is opened, the second through hole 13 is released, at the moment, the acidifier enters the second flow channel 8 through the second through hole 13 by squeezing the acidifier into the pipeline, then enters the filtering pipe section from the second flow channel 8, the acidifier is released from the filtering pipe section to the oil well, and the acidification channel is established.
As shown in fig. 3, the central tube 11 includes a connecting sleeve 15, one end of the connecting sleeve 15 is provided with a second overflowing coupling 16, the other end of the connecting sleeve 15 is connected with a connecting tube 17, the base tube 21 is connected with a third overflowing coupling 16, the second pressing switch 5 is arranged on the connecting sleeve 15, the first pressing switch 4 is arranged on the connecting tube 17, and the annular check valve assembly 6 is arranged on the connecting tube 17. Like this, be equipped with central tube 11 of kill switch and adopt sectionalized adapter sleeve 15 and connecting pipe 17 to pass through the screw thread detachable connection, first kill switch 4 and second kill switch 5 install respectively on connecting pipe 17 and adapter sleeve 15, when first kill switch 4 or second kill switch 5 arbitrary one take place to damage, the dismouting of being convenient for is changed, easily nurses and used repeatedly, reduction in production cost.
As shown in fig. 3, the first stamping switch 4 includes a first switch sleeve 41 covering the first through hole 12 and slidably connected to the outer wall of the central tube 11, and a first shearing pin 42 for connecting the first switch sleeve 41 and the outer wall of the central tube 11, wherein the first switch sleeve 41 is provided with a first stamping groove 43 opening towards the first through hole 12, and the depth of the first stamping groove 43 gradually decreases along the axis of the central tube 11 towards the direction away from the one-way flow device 6.
Thus, when the inside of the central tube 11 is pressed, the first punching groove 43 is pressed by the first shearing pin 42, the depth of the first punching groove 43 is gradually reduced along the axis of the central tube 11 toward the direction away from the one-way flow device 6, a slope is formed in the direction away from the one-way flow device 6, the first switch sleeve 41 is pushed in the direction away from the central tube 11 and in the direction away from the one-way flow device 6, and when the pressure exceeds the critical value of the first shearing pin 42, the first shearing pin 42 is sheared, the first switch sleeve 41 slides in the direction away from the one-way flow device 6, and the first through hole 12 is released.
As shown in fig. 3, the outer edge of the opening of the first punched groove 43 is provided with a first sealing member 44 slidably coupled to the outer wall of the center tube 11. In this way, the first sealing element 44 serves to reinforce the sealing of the first through-opening 12, ensuring a sealing effect during the running of the completion.
As shown in fig. 3, the second press switch 5 includes a second switch sleeve 51 covering the second through hole 13 and slidably connected to the outer wall of the central tube 11, a second shear pin 52 for connecting the second switch sleeve 51 to the outer wall of the central tube 11, a telescopic spring 53 having one end connected to one side of the second switch sleeve 51 away from the one-way flow device 6, and a fixing ring 54 connected to the other end of the telescopic spring 53, wherein a second press groove 55 having an opening facing the first through hole 13 is formed in the second switch sleeve 51, and the depth of the second press groove 55 is gradually reduced along the axis of the central tube 11 toward the direction away from the one-way flow device 6.
Thus, the second shear pin 52 acts as a locking element for the second switch sleeve 51, when the inside of the central tube 11 is pressed, pressure acts on the second stamping groove 55, the depth of the second stamping groove 55 gradually decreases along the axis of the central tube 11 in the direction away from the one-way flow device 6, a slope is formed in the direction away from the one-way flow device 6, the second switch sleeve 51 is pushed in the direction away from the central tube 11 and in the direction away from the one-way flow device 6, when the pressure exceeds the critical value of the second shear pin 52, the second shear pin 52 is sheared, the second switch sleeve 51 slides in the direction away from the one-way flow device 6, the second through hole 13 is released, and during acidification, acidulant can be squeezed out through the second through hole 13 to perform acidification.
Therefore, after the acidizing operation is finished, the central pipe 11 is decompressed, the telescopic spring 53 pushes the second switch sleeve 51 back to the original position due to resilience force, the second through hole 13 is closed again, oil can only enter the central pipe through the first through hole 12, and the second switch sleeve 51 which can be opened and closed in a telescopic mode can facilitate the first through hole 12 to be provided with a flow control valve according to requirements to achieve oil quantity control; meanwhile, the fixing ring 54 is provided with threads matched with the central tube 11, the compression degree of the telescopic spring can be adjusted by adjusting the position of the fixing ring 54, and then the resilience force of the second switch sleeve 51 can be adjusted by adjusting the fixing ring 54.
As shown in fig. 3, the outer edge of the opening of the second punched groove 55 is provided with a second sealing member 56 slidably connected to the outer wall of the center tube 11. In this way, the second sealing member 56 serves to reinforce the sealing of the second through hole 13, ensuring a sealing effect.
As shown in fig. 1 and 2, the filter pipe section 2 includes a base pipe 21 having one end connected to the central pipe 11, a first flow passing coupling 22 connected to the other end of the base pipe 21, a filter screen sleeve 23 sleeved on the base pipe 21, the filter screen sleeve 23 forming a filter passage 9 with an outer sidewall of the base pipe 21, an outer sidewall of the filter screen sleeve 23 being connected to the protective sleeve 14, the filter passage 9 being communicated with the second flow passage 8. A support frame is arranged between the filter net sleeve 23 and the base pipe 21 and is connected with the base pipe 21 to play a role in supporting and prevent the filter net sleeve 23 from deforming so as to influence the flux of the filter passage 9.
As shown in FIG. 1, the short segment 3 comprises a second flow-passing collar 31 connected at one end to the base pipe 11, a short-segment head 32 connected at the other end of the second flow-passing collar 31, and the outer side wall of the second flow-passing collar 31 is connected to the inner side wall of one end port of the protective casing 14.
In this way, the short section 3 and the filtering pipe section 2 of another floating screen can be mutually matched and connected through the first overflowing coupling 22, and the requirement of actually producing a plurality of floating screens to be connected in series and then be put in.
As shown in fig. 3, the one-way flow device 6 includes a one-way valve 61, an outer sealing ring 63 disposed on the one-way valve 61 and connected to the inner side wall of the protective sheath 14, an inner sealing ring 64 disposed on the one-way valve 61 and connected to the outer side wall of the central tube 11, and a grommet 62 connected to one end of the one-way valve 61 for adjusting the installation position of the one-way valve 61.
Thus, the outer sealing ring 63 and the inner sealing ring 64 ensure the sealing effect of the passages on the left and right sides of the flow direction of the check valve 61, and ensure that oil can only enter the first flow passage 7 from the second flow passage 8 through the check valve 61 when the production passage is established.
The working principle of the embodiment is as follows: in the process of starting operation, the first pressing switch 4 and the second pressing switch 5 are in a closed state, the whole central pipe is in a closed state, the floating of the whole floating sieve pipe can be realized by buoyancy generated by a closed cavity of the central pipe in well completion fluid, and the friction between the pipe wall of the floating sieve pipe and the well wall is reduced; after the pipe column is put in place, because the number of the first shearing pins 42 of the first pressing switch 4 is smaller than that of the second shearing pins 52, and the opening pressure critical value of the first pressing switch 4 is far smaller than that of the second pressing switch 5, when the pipe column is pressed into the central pipe, the first pressing switch 4 is firstly opened, the first pressing switch 4 is opened, and the first through hole 12 corresponding to the first pressing switch 4 is released; the filtering pipe section 2 is used as a filtering treatment section of petroleum, oil in the mesh well is filtered by the filtering pipe section 2, the oil enters a filtering channel 9 and then passes through a second flow passage 8, and because the annular check valve assembly 6 has a one-way sealing function and a conducting function in the other direction, the central pipe is decompressed, the annular check valve assembly 6 is conducted, the oil reaches the second flow passage 8 through the filtering pipe section 2, then enters a first flow passage 7 through the annular check valve assembly 6 and finally enters the central pipe through a first through hole 12, and a production channel is established; if the squeezing acidizing operation is needed, the interior of the central tube 11 can be continuously pressed, when the pressure critical value of the second pressing switch 5 is exceeded, the second pressing switch 5 is opened, the second through hole 13 is released, at the moment, the acidifier enters the second flow channel 8 through the second through hole 13 by squeezing the acidifier into the pipeline, due to the fact that the annular one-way valve assembly 6 is provided with one-way sealing, the acidifier can only enter the filter pipe section 2 from the second flow channel 8, the acidifier is released into the well completion from the filter channel 9 of the filter pipe section 2, acidizing blockage removal operation is achieved, and an acidizing channel is established.
Example 2
The present embodiment is similar to embodiment 1, and is different from embodiment 1 in that in this embodiment, the second press switch 5 includes a second switch sleeve 51 wrapping the second through hole 13 and slidably connected to the outer wall of the center tube 11, and a second shear pin 52 for connecting the second switch sleeve 51 to the outer wall of the center tube 11, a second punch groove 55 opening toward the second through hole 13 is opened on the second switch sleeve 51, and the depth of the second punch groove 55 gradually decreases along the axis of the center tube 11 toward the direction away from the one-way flow device 6. The structure and operation principle of the other parts of this embodiment are the same as those of embodiment 1.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a float screen pipe, includes pressure sliding sleeve pipeline section (1), connects filtration pipeline section (2) of pressure sliding sleeve pipeline section (1) one end, connects short section (3) of pressure sliding sleeve pipeline section (1) other end, its characterized in that: the pressure sliding sleeve pipe section (1) comprises a central pipe (11), a protective sleeve (14) arranged on the periphery of the central pipe (11) is sleeved, one end port of the protective sleeve (14) is connected with the outer side wall of the filtering pipe section (2), the other end port of the protective sleeve (14) is connected with the outer side wall of the short section (3), a flow channel is formed between the inner side wall of the protective sleeve (14) and the outer side wall of the central pipe (11), a first through hole (12) communicated with the flow channel is formed in the side wall of the central pipe (11), a position sleeve corresponding to the first through hole (12) on the outer wall of the central pipe (11) is provided with a first pressurizing switch (4) used for controlling the first through hole (12) and the flow channel to be communicated/disconnected, a one-way circulating device (6) is arranged at a position between the first through hole (12) and the filtering pipe section (2) in the flow channel, the one-way flow device (6) divides the flow channel into a first flow channel (7) which can be communicated with the first through hole (12) and a second flow channel (8) which is communicated with the filtering pipe section (2), and the outlet end of the one-way flow device (6) faces to the first flow channel (7);
the second through hole (13) communicated with the second flow channel (8) is formed in the position, corresponding to the second flow channel (8), on the side wall of the central tube (11), the position, corresponding to the second through hole (13), on the outer wall of the central tube (11) is sleeved with the second pressure switch (5) used for controlling the communication/disconnection of the second through hole (13) and the second flow channel (8), and the opening pressure critical value of the second pressure switch (5) is larger than that of the first pressure switch (4).
2. A floating screen as claimed in claim 1, characterized in that the first press switch (4) comprises a first switch sleeve (41) enclosing the first through hole (12) and slidably connected to the outer wall of the base pipe (11), a first shear pin (42) connecting the first switch sleeve (41) and the outer wall of the base pipe (11), the first switch sleeve (41) being provided with a first press groove (43) opening towards the first through hole (12), the depth of the first press groove (43) decreasing along the axis of the base pipe (11) in a direction away from the one-way flow device (6).
3. A floating screen as claimed in claim 2, characterised in that the outer edges at the opening of the first punched groove (43) are provided with first seals (44) in sliding connection with the outer wall of the base pipe (11).
4. A floating screen as claimed in claim 3, characterized in that the second press switch (5) comprises a second switch sleeve (51) enclosing the second through hole (13) and slidably connected to the outer wall of the base pipe (11), a second shear pin (52) connecting the second switch sleeve (51) and the outer wall of the base pipe (11), the second switch sleeve (51) being provided with a second press groove (55) opening towards the second through hole (13), the depth of the second press groove (55) decreasing along the axis of the base pipe (11) in a direction away from the one-way flow device (6).
5. The floating screen according to claim 1, wherein the second open-close switch (5) comprises a second switch sleeve (51) slidably connected to the outer wall of the base pipe (11) surrounding the second through hole (13), a second shearing pin (52) used for connecting the second switch sleeve (51) and the outer wall of the central tube (11), a telescopic spring (53) with one end connected with one side of the second switch sleeve (51) far away from the one-way circulation device (6), and a fixing ring (54) connected with the other end of the telescopic spring (53), a second punching groove (55) with an opening facing the second through hole (13) is formed on the second switch sleeve (51), the depth of the second punched groove (55) is gradually reduced along the axis of the central tube (11) towards the direction far away from the one-way flow-through device (6).
6. A floating screen as claimed in claim 4 or 5, characterised in that the outer edges of the openings of the second punched grooves (55) are provided with second seals (56) in sliding connection with the outer wall of the base pipe (11).
7. A floating screen as claimed in claim 1, characterized in that the filter section (2) comprises a base pipe (21) connected at one end to the base pipe (11), a first flow coupling (22) connected to the other end of the base pipe (21), a filter screen sleeve (23) fitted over the base pipe (21), the filter screen sleeve (23) forming a filter passage (9) with the outer sidewall of the base pipe (21), the outer sidewall of the filter screen sleeve (23) being connected to the protective sleeve (14), the filter passage (9) being in communication with the second flow passage (8).
8. A floating screen as claimed in claim 1, characterized in that the stub section (3) comprises a second flow passing collar (31) connected at one end to the base pipe (11), a stub head (32) being connected to the other end of the second flow passing collar (31), the outer sidewall of the second flow passing collar (31) being connected to the inner sidewall of one end port of the protective casing (14).
9. A floating screen according to claim 1, characterized in that the one-way flow means (6) comprises a one-way valve (61), an outer sealing ring (63) provided on the one-way valve (61) in connection with the inner side wall of the protective casing (14) and an inner sealing ring (64) provided on the one-way valve (61) in connection with the outer side wall of the base pipe (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110602001.3A CN113216911B (en) | 2021-05-31 | 2021-05-31 | Floating sieve tube |
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| CN202110602001.3A CN113216911B (en) | 2021-05-31 | 2021-05-31 | Floating sieve tube |
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| CN113216911B true CN113216911B (en) | 2022-09-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6719051B2 (en) * | 2002-01-25 | 2004-04-13 | Halliburton Energy Services, Inc. | Sand control screen assembly and treatment method using the same |
| CN101328794B (en) * | 2008-07-19 | 2012-04-18 | 东营天华石油技术开发有限公司 | Switch type sand-prevention screening tube |
| CN201738902U (en) * | 2010-05-24 | 2011-02-09 | 大港油田集团有限责任公司 | Horizontal well circulating gravel packing sand retention device |
| CN203515522U (en) * | 2013-09-24 | 2014-04-02 | 中国石油天然气股份有限公司 | Choke type oil well output liquid control device |
| CN106437537B (en) * | 2016-09-06 | 2019-04-26 | 中国石油化工股份有限公司 | A kind of pumping pipe string with hot-washing wax remover function |
| CN110485968B (en) * | 2019-09-16 | 2021-06-08 | 中国石油化工股份有限公司 | One-stage two-section eccentric acid injection integrated tubular column |
| CN112412402A (en) * | 2020-12-11 | 2021-02-26 | 东营市瑞丰石油技术发展有限责任公司 | Pressure opening type floating sieve tube |
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