CN115450589B - Variable-precision rotary blocking removal sieve tube and method - Google Patents
Variable-precision rotary blocking removal sieve tube and method Download PDFInfo
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- CN115450589B CN115450589B CN202210934093.XA CN202210934093A CN115450589B CN 115450589 B CN115450589 B CN 115450589B CN 202210934093 A CN202210934093 A CN 202210934093A CN 115450589 B CN115450589 B CN 115450589B
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 30
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- 230000000694 effects Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000011010 flushing procedure Methods 0.000 abstract description 6
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Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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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
- 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
Abstract
The invention discloses a variable-precision rotary blocking removing sieve tube and a method, wherein the sieve tube mainly comprises an inner tube, and sand blocking holes of the inner tube are distributed on the surface of the tube wall of the sieve tube; the surface of the pipe wall of the outer pipe is distributed with outer pipe sand blocking holes; the inner pipe is sleeved in the pipe hole of the outer pipe, an annular gap exists between the inner pipe and the outer pipe, and the inner pipe and the outer pipe can rotate relatively. A certain annular gap is reserved between the inner pipe and the outer pipe, and the annular gap can be used as a sand setting cavity of fine sand in the initial stage of exploitation, so that the sand holding capacity of the sieve tube is improved, and the blocking period is prolonged. Other sand blocking mediums can be filled according to the specific stratum to be used as a conventional screen pipe. Through the cooperation of different angles between the inner tube and the outer tube, the hydraulic parameter under the same discharge capacity can be changed, so that the flushing and blocking removing effect is better, for example, through rotating the inner tube, the overlapping area of the holes of the inner tube and the outer tube is reduced, the flow area of water flow is reduced, the water flow speed and the pressure are indirectly increased, and the flushing and blocking removing effect is improved on the premise of not changing the ground construction parameter and the cost.
Description
Technical Field
The invention relates to a natural gas hydrate exploitation tool, in particular to a variable-precision rotary blocking removal sieve tube and a method.
Background
Sand production is a common problem of reducing productivity and affecting the trial production process, and sand prevention and sand control management become one of important measures for guaranteeing the development of natural gas hydrates. The concrete see the documents 'Dong Changyin, song Yang, zhou Yugang, etc.' of natural gas hydrate reservoir argillaceous fine powder sand blocking medium blocking law and microscopic sand blocking mechanism 'J' of petroleum journal 2020, 41 (10): 1248-58 'and' Shi Haoxian, xie Wenwei, in Yangtze river, etc. 'of application feasibility analysis of composite unblocking technology in natural gas hydrate development' J 'of drilling engineering 2022, 49 (1): 5-15'.
For this reason, there is a need to design a screen with variable precision that can be unblocked to meet the long-term hydrate production requirements, and the existing research mainly includes: the CN113638720a patent uses the rise of fluid pressure caused by the blockage in the later stage of production to open and partially close the filter screen, and the flow channel is established again, so that the flow capacity is maintained. However, this approach has a significant problem of gradually depleting the flow area of the screen, but is only staged open, and the standby channels are gradually depleted as production continues. Does not play a role in recycling; patent CN112901124A adopts a physicochemical process, and a removable plugging agent is filled in a gap to realize plugging removal of the sieve tube, and the sieve tube also belongs to loss type; the patent CN113494276A is convenient to unblock and wash by arranging a plurality of through grooves on the sieve tube main body; the patent CN113622878A carries out sand scraping treatment through a claw-shaped device below the annular cleaner and carries out screen pipe blocking removal by utilizing high-pressure water sand cleaning sprayed by a nozzle, and the device does not consider that a hydrate reservoir is weak and easy to leak although blocking removal to a certain extent is considered, and high-pressure fluid can cause harm to near-well stability; the patent CN113653471A has a self-compaction function, and can keep the pre-filled ceramsite in a compact filling state for a long time by adjusting, so that stable sand blocking precision and sand blocking effect are kept; there are also patents such as CN113513289a which use electromagnetic heating to defrost and unblock the screen. In addition, the sand blocking precision of the existing sieve tube is generally not adjustable, once the sieve tube is formed on land, the internal structure of the sieve tube is stable, the shape of a seepage channel of the sieve tube is determined, and the sand blocking precision can not be adjusted according to the characteristics of stratum physical parameters. Also, screens such as Geoform expanded screens produced by schlenz, which may be pre-expanded or expanded in the well, are essentially shaped differently and cannot be changed in accuracy after expansion. While the other part of the plugging removing sieve tube pays attention to the requirement that the sieve tube needs to be plugged, the plugging removing effect of the sieve tube is also disappeared along with the complete use of reserved pore channels, which mostly takes the original sand blocking pore channels of the sieve tube as the premise, and the new pore channels are released while plugging.
In conclusion, the design does not realize repeated blocking removal and sand shifting of the sieve tube, and cannot achieve the aim of long-term stable production of a single well. Therefore, there is a need to design a screen pipe which can realize different sand blocking precision along with different periods of exploitation, has good blocking removal effect and can be repeatedly used, and can meet the long-term development of hydrates and oil gas.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a variable-precision rotary blocking removing sieve tube and a method, so as to solve the problem that reasonable sand blocking precision cannot be effectively determined because the median value of the stratum particle size is too thin in the development process of hydrates.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in a first aspect, the present invention provides a variable precision rotary deblock screen comprising:
the surface of the pipe wall of the inner pipe is distributed with inner pipe sand blocking holes;
the surface of the pipe wall of the outer pipe is distributed with outer pipe sand blocking holes;
The inner pipe is sleeved in the pipe hole of the outer pipe, an annular gap exists between the inner pipe and the outer pipe, and the inner pipe and the outer pipe can rotate relatively.
Further, the inner tube comprises an inner tube base tube body, and the front end and the rear end of the inner tube base tube body are respectively used as an inner tube male connector and an inner tube female connector; spring buckles are arranged on the outer surfaces of the circumferences of the pipe walls of the inner pipe male connector and the inner pipe female connector at intervals;
the outer tube comprises an outer tube base tube body, and the front end and the rear end of the outer tube base tube body are respectively used as an outer tube male connector and an outer tube female connector; and outer pipe tabletting grooves corresponding to the spring buckles are formed in the inner surfaces of the circumferences of the pipe walls of the outer pipe male connector and the outer pipe female connector at intervals.
Further, the spring buckle comprises a spring base, a spring is assembled in the spring base and is pressed by a telescopic positioning pressing piece, and a telescopic positioning pressing piece sleeve is sleeved on the telescopic positioning pressing piece.
Furthermore, the inner pipe male connector and the inner pipe female connector are connected and matched in a threaded mode, but only can rotate clockwise in the rotating process.
Further, the variable-precision rotary blocking removing sieve tube also comprises a power tube; a power tube positioning groove is also arranged in the inner tube; the power tube is matched with a spring clamping mechanism which is matched with the power tube positioning groove so as to drive the inner tube to rotate by the power tube.
Further, the slot depth of the power pipe positioning groove is larger than that of the outer pipe tabletting groove.
Further, the power pipe positioning grooves are distributed at intervals along the circumferential direction A, and the inner pipe sand blocking holes are distributed at intervals along the circumferential direction B; wherein A, B is an integer and A is larger than B, but A is not a multiple of B, so as to ensure that the fit between the inner tube and the outer tube is changed after the inner tube rotates by A degrees, and the overlapped overflow area is changed.
Further, in the process that the power pipe drives the inner pipe to rotate, the telescopic positioning pressing piece tends to be flat due to bending, the spring is compressed, and when the power pipe rotates to the next outer pipe pressing piece groove, the spring is in a compressed state-stretching state, and the telescopic positioning pressing piece is flat-bending, so that the positioning and fixing of the inner pipe and the outer pipe are realized.
Further, the power pipe positioning grooves are distributed at intervals along the circumferential direction A, and the inner pipe sand blocking holes are distributed at intervals along the circumferential direction B; wherein A, B is an integer and A is larger than B, but A is a multiple of B, so as to ensure that the fit between the inner tube and the outer tube is not changed after the inner tube rotates by A degrees, and the overlapped overflow area is not changed.
In a second aspect, the present invention provides a variable precision rotary blocking removal screen method, based on the variable precision rotary blocking removal screen, the method comprising the steps of:
Step 1: connecting a power pipe through a derrick, lowering the power pipe, placing the power pipe into the inner pipe, and fixing the power pipe and the inner pipe through a spring clamping mechanism assembled by the power pipe;
Step 2: pumping a blocking removing medium to the bottom of a well through pumping equipment of the ground or a platform;
Step 3: when the blocking removing medium is pumped, the top driving device of the derrick is utilized to drive the power pipe to rotate, the power pipe transmits the rotating torque to the inner pipe through the spring clamping mechanism on the power pipe to drive the inner pipe to rotate at a set speed, the inner pipe and the outer pipe are kept connected through the spring clamping buckle, and the requirements that the inner pipe rotates in the outer pipe and the axial position is maintained to be stable are met; the inner pipe rotates in the outer pipe, sand blocking holes of the inner pipe and the outer pipe are overlapped in different modes, different intercepting areas are generated, and under the same blockage removing medium displacement, the flow speed periodically fluctuates to remove blockage substances;
Step 4: after the blocking removing medium acts on the sieve tube and the near-well zone stratum for a certain period, the blocking of the sieve tube and the near-well zone pore is removed, and the seepage channel is recovered;
Step 5: at the moment, according to stratum physical parameters and the exploitation requirements of oil and gas wells and hydrates, the power pipe is kept stable after rotating for a certain angle, at the moment, the sand blocking hole overlapping mode of the inner pipe and the outer pipe of the sieve pipe is changed with the initial well entering mode, and the sand blocking precision of the sieve pipe is changed; the sand blocking precision of the well is designed to be fine, the sand blocking precision after the sand blocking precision is changed is coarse, and the specific range of the sand blocking precision is determined according to the specific conditions of different oil-gas fields and hydrate reservoirs;
Step 6: when the oil-gas well and the hydrate resource are developed for a certain period, the screen pipe is plugged again, and the steps 2-3 are repeated until the screen pipe is plugged;
Step 7: when the oil-gas well and hydrate resource are developed to the end, repeating the steps 2-5, wherein the sand blocking precision of the sieve tube is changed from coarse to fine until the exploitation of the exploitation well is finished
Compared with the prior art, the invention has the beneficial effects that:
1. A certain annular gap is reserved between the inner pipe and the outer pipe, and the annular gap can be used as a sand setting cavity of fine sand in the initial stage of exploitation, so that the sand holding capacity of the sieve tube is improved, and the blocking period is prolonged. Other sand blocking media, such as metal cotton, gravel particles and the like, can be filled according to the specific stratum and used as a conventional screen pipe.
2. In the development process of oil gas resources or hydrate resources, the long-term accumulation of silt often causes the blockage of a sand control medium, in order to maintain production, a plugging removal measure is generally needed to be put into the screen, and the plugging is flushed away by putting a smaller oil pipe into the screen pipe and using a high-pressure liquid injection mode, so that the most common plugging removal mode is realized. The invention has the advantages that the hydraulic parameters under the same displacement can be changed through the cooperation of different angles between the inner pipe and the outer pipe, so that the flushing and blocking removing effect is better, for example, the overlapping area of the openings of the inner pipe and the outer pipe is reduced through rotating the inner pipe, thus the flow area of water flow is reduced, the water flow speed and the pressure are indirectly increased, and the flushing and blocking removing effect is improved on the premise of not changing the ground construction parameters and the cost.
3. The existing research shows that in the exploitation process of oil gas and hydrate resources, the early sand is generally fine sand, the middle sand is middle sand, and the later sand is changed into fine sand, so that the single sand blocking precision can not meet the requirement.
Drawings
FIG. 1 is a cross-sectional view of a variable precision rotary deblock screen provided by an embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of an inner tube according to an embodiment of the present invention;
FIG. 3 is a schematic side view of an inner tube according to an embodiment of the present invention;
Fig. 4 is a schematic front view of an inner tube according to an embodiment of the present invention;
Fig. 5 is a schematic front view of an outer tube according to an embodiment of the present invention;
FIG. 6 is a construction schematic of a variable precision rotary blocking removal method provided by an embodiment of the invention;
In the figure: 1. retractable positioning tabletting; 2. a telescopic positioning tabletting sleeve; 3. a spring base; 4. a spring; 5. an inner tube base pipe body; 6. an inner pipe female joint; 7. a sand blocking hole of the inner pipe; 8. a power tube positioning groove; 9. an inner tube male connector; 10. an outer tube tabletting groove; 11. a sand blocking hole of the outer tube; 12. an outer tube base body; 13. an outer tube female joint; 14. an outer tube male connector; 15. annulus clearance; 16. a power pipe; 17. a spring clip mechanism; 18. a derrick; 19. ground or platform; 20. removing the blocking medium; 21. a formation; 100. an inner tube; 200. an outer tube; 300. and a spring buckle.
Detailed Description
Examples:
in the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; the two components may be mechanically connected, directly connected, or indirectly connected through an intermediate medium, so to speak, the two components are in communication. It will be understood by those of ordinary skill in the art that the terms described above are in the specific sense of the present invention. The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 5, the variable precision rotary plug removal screen provided in this embodiment mainly includes an inner pipe 100 and an outer pipe 200; the surface of the pipe wall of the inner pipe 100 is distributed with inner pipe sand blocking holes 7; the wall surface of the outer tube 200 is distributed with outer tube sand blocking holes 11; the inner tube 100 is sleeved in the tube hole of the outer tube 200, and the inner tube and the outer tube have an annular gap 15 and can rotate relatively. Because a certain annular gap 15 is reserved between the inner tube and the outer tube, the sand can be used as a sand setting cavity of fine sand in the initial stage of exploitation, the sand holding capacity of the sieve tube is improved, and the blocking period is prolonged. Other sand blocking media, such as metal cotton, gravel particles and the like, can be filled according to the specific stratum and used as a conventional screen pipe.
In the development process of oil gas resources or hydrate resources, the long-term accumulation of silt often causes the blockage of a sand control medium, in order to maintain production, a plugging removal measure is generally needed to be put into the screen, and the plugging is flushed away by putting a smaller oil pipe into the screen pipe and using a high-pressure liquid injection mode, so that the most common plugging removal mode is realized. In the application, because the inner pipe and the outer pipe can relatively rotate, the hydraulic parameters under the same displacement can be changed through the different angle coordination between the inner pipe and the outer pipe, so that the flushing and blocking removing effect is better, for example, the overlapping area of the openings of the inner pipe and the outer pipe is reduced through rotating the inner pipe, thus the flow area of water flow is reduced, the water flow speed and the pressure are indirectly increased, and the flushing and blocking removing effect is improved on the premise of not changing the ground construction parameters and the cost.
In addition, the existing research shows that in the exploitation process of oil gas and hydrate resources, the early sand is generally fine sand, the middle sand is middle sand, and the later sand is changed into fine sand, so that the single sand blocking precision can not meet the requirement.
In a specific embodiment, the inner tube includes an inner tube base tube body 5, and front and rear ends of the inner tube base tube body 5 are respectively used as an inner tube male connector 9 and an inner tube female connector 6 to achieve splicing of the two inner tubes; specifically, the female inner pipe joint 6 and the male inner pipe joint 9 are matched by adopting threads or other connection, so that torque can be transmitted among a plurality of inner pipes, but the inner pipes can only rotate clockwise in the rotating process, and the reverse buckling pipe column is prevented from being separated; spring buckles 300 are arranged on the outer surfaces of the circumferences of the pipe walls of the inner pipe male connector 9 and the inner pipe female connector 6 at intervals; the outer tube comprises an outer tube base tube body 12, wherein the front end and the rear end of the outer tube base tube body 12 are respectively used as an outer tube male connector 14 and an outer tube female connector 13 so as to realize the splicing of two outer tubes, and the outer tube female connector 13 and the outer tube male connector 14 are also matched by adopting threads or other connection; the outer pipe pressing grooves 10 corresponding to the spring buckles are arranged on the inner surfaces of the circumferences of the outer pipe male connector 14 and the outer pipe female connector 13 at intervals, so that the inner pipe can be sleeved in the pipe holes of the outer pipe through the assembly of the spring buckles and the outer pipe pressing grooves 10, and meanwhile, the spring buckles and the outer pipe pressing grooves are distributed on the outer surfaces of the circumferences of the pipe walls at intervals, so that the rotary positioning can be realized.
Specifically, the spring buckle 300 includes a spring base 3, a spring 4 is assembled in the spring base 3, the spring 4 is pressed by a telescopic positioning pressing piece 1, and a telescopic positioning pressing piece sleeve 2 is sleeved on the telescopic positioning pressing piece 1. In this way, the inner tube can be rotationally positioned, but the spring buckle 300 can also be in other buckling modes, so long as the inner tube can be rotationally positioned. The telescopic positioning pressing sheet 1 is made of alloy materials, has the characteristics of high elasticity, low yield coefficient and good elasticity, can meet the deformation requirement of multiple bending and flattening, and can have certain strength and can transmit torque and pressure after being bent; the telescopic positioning tabletting sleeve 2 is made of alloy materials, has the characteristics of high strength, high yield coefficient and difficult deformation, can be made of Q460 and series of steel materials above, and is mainly used for limiting the bending and flattening amplitude and range of the telescopic positioning tabletting 1 and preventing the telescopic positioning tabletting 1 from being separated from the original set position in the bending deformation process; the spring 4 alloy material includes, but is not limited to: 50Crv, 55CrSi, 60Si2Mn, spring forms including but not limited to: the disc spring, the annular spring, the plate spring and the spiral spring provide supporting force for the telescopic positioning pressing sheet 1; the spring base 3 is made of high-strength alloy steel, a base mounting position is provided for the spring 3, and the spring base 3 is welded on the inner pipe base pipe body 5; the inner tube base tube body 5 and the outer tube base tube body 12 are made of alloy steel such as L80, and the like, so as to provide a processing foundation for other structures of the inner tube, and are generally cylindrical.
When the plugging removal or precision changing operation is needed, a thinner power pipe 16 is put into the inner pipe, and the plugging removal sieve pipe is used as a preferential choice of the precision changing rotary plugging removal sieve pipe in the embodiment, and the plugging removal sieve pipe also comprises the power pipe 16 and a spring clamping mechanism 17 matched with the power pipe; the inner tube is also provided with a power tube positioning groove 8 which is matched with the spring clamping mechanism 17, the depth of a groove hole of the power tube positioning groove 8 is larger than that of a groove hole of the outer tube tabletting groove 10, and the aim is that the torque of the power tube driving the inner tube to rotate is larger than the torque required by the rotation of the inner tube relative to the outer tube, so that the power tube can drive the inner tube to rotate relative to the outer tube, and the specific torque value can be adjusted according to design requirements. In the process of driving the inner pipe to rotate by the power pipe, the telescopic positioning pressing sheet 1 tends to be flat due to bending, the spring 3 is compressed, and when the spring rotates to the next outer pipe pressing sheet groove, the spring is in a compressed state-stretching state, and the telescopic positioning pressing sheet is flat-bent, so that the positioning and fixing of the inner pipe and the outer pipe are realized. The rotational positioning method is not limited to the one described in this embodiment, and a mechanism with a similar function as a spring card may be used.
Specifically, the inner tube sand blocking holes 7 are designed by the screen pipe according to the specific stratum and the use requirement, the number and the shape of the sand blocking holes are only provided as illustrations, and in the actual use process, the sand blocking holes can be any designed shape including spiral, round, diamond and the like. The distribution of the sand blocking holes and the distribution of the positioning grooves are designed according to the requirement, for example, the power pipe positioning grooves 8 are distributed along the circumferential direction by 90 degrees, but the inner pipe sand blocking holes 7 can be distributed along the circumferential direction by 60 degrees, and of course, the inner pipe sand blocking holes can also be distributed along other angles as long as the distribution is not a divisor of 90 degrees, so that the inner pipe is ensured to be matched with the inner pipe and the outer pipe to be changed after being rotated by 90 degrees, and the overlapped overflow area is changed; on the premise of not changing the precision, the same matching angle needs to be kept after rotation so as to ensure that the sand blocking precision is unchanged, and the embodiment is designed in such a way that the precision is not changed: the power pipe positioning grooves 8 are distributed at intervals of 90 degrees along the circumferential direction, the inner pipe sand blocking holes 7 are distributed at intervals of 30 degrees along the circumferential direction, and the inner pipe sand blocking holes can be distributed at other angles, so that the inner pipe sand blocking holes can be distributed at intervals of 30 degrees along the circumferential direction, and the inner pipe sand blocking holes can be distributed at other angles only by a divisor of 90 degrees, and the inner pipe sand blocking holes can be matched with the outer pipe sand blocking holes in an overlapping manner after being rotated by 90 degrees. The design principle of the outer pipe sand blocking hole 11 is similar to that of the inner pipe sand blocking hole, and the outer pipe sand blocking hole can be matched with the inner pipe sand blocking hole to achieve the composite sand blocking effect aiming at different stratums.
The steps of the assembly of the variable-precision rotary blocking removal sieve tube provided by the embodiment are as follows:
1. According to stratum physical parameters, proper sand blocking precision is designed, and parameters such as the shape and the size of sand blocking holes of the inner tube and the outer tube, the thickness of annular space of the inner tube and the outer tube, the overall inner diameter and the length of the sieve tube and the like are determined, so that a foundation is provided for processing;
2. the construction site connection is realized by firstly inserting the inner pipe 100 into the outer pipe 200 to realize the connection of a first screen pipe;
3. connecting an inner pipe with the inner pipe of the first sieve tube to realize the interconnection between the inner pipes;
4. Connecting one outer tube with the outer tube of the first sieve tube to realize the connection of the second sieve tube;
Repeating the steps to realize connection with different design lengths, and placing the connection to the designed well depth position by using a drill rod;
With a certain period of oil gas or natural gas hydrate exploitation, sand blocking holes of an inner pipe and an outer pipe and annular gaps of a sieve tube are blocked to a certain extent, meanwhile, due to exploitation reasons, the original sand production property of a stratum is changed, so that the sand blocking precision also needs to be properly adjusted, and therefore, the embodiment also provides a variable precision rotary blocking-removing sieve method, as shown in fig. 6, based on the variable precision rotary blocking-removing sieve tube, the method takes annular gaps not filled with other types of sand blocking media as an example, and specifically comprises the following steps:
Step 1: connecting the power pipe 16 through a derrick 18, lowering the power pipe, placing the power pipe into the inner pipe, and fixing the power pipe through a spring clamping mechanism 17 assembled by the power pipe 16 and the inner pipe;
step 2: pumping the unblocking medium 20 downhole by pumping equipment at the surface or platform 19; the pumped blocking remover 20 can be high-pressure fluid, biological enzyme and acid blocking remover;
Step 3: while the blocking removing medium 20 is pumped, the top driving device of the derrick 18 is utilized to drive the power pipe 16 to rotate, the power pipe 16 transmits the rotation torque to the inner pipe 100 through the spring clamping mechanism 17 on the power pipe 16, the inner pipe 100 is driven to rotate at a set speed, the inner pipe 100 and the outer pipe 200 are kept connected through the inner pipe spring clamping buckle 300, and the requirements of the inner pipe 100 rotating in the outer pipe 200 and maintaining stable axial positions are met; the inner pipe 100 rotates in the outer pipe 200, sand blocking holes of the inner pipe and the outer pipe are overlapped in different modes, different interception areas are generated, and under the same blockage removal medium displacement, the flow velocity periodically fluctuates to remove blockage substances;
step 4: after the plugging removing medium 20 acts on the sieve tube and the near-well zone stratum 21 for a certain period, the pore plugging of the sieve tube and the near-well zone is removed, and the seepage channel is recovered;
Step 5: at this time, according to stratum physical parameters and the exploitation demands of oil and gas wells and hydrates, the power pipe 16 is rotated for a certain angle and then kept stable, at this time, the sand blocking hole overlapping mode of the inner pipe and the outer pipe of the sieve pipe is changed with the initial well entry, and the sand blocking precision of the sieve pipe is changed; the sand blocking precision of the well is designed to be fine, the sand blocking precision after the sand blocking precision is changed is coarse, and the specific range of the sand blocking precision is determined according to the specific conditions of different oil-gas fields and hydrate reservoirs; in this step, the terms "thin" and "thick" are relative adjectives and do not represent a limitation on a particular dimension;
Step 6: when the oil-gas well and the hydrate resource are developed for a certain period, the screen pipe is plugged again, and the steps 2-3 are repeated until the screen pipe is plugged;
Step 7: and when the oil-gas well and hydrate resources are developed to the end, repeating the steps 2-5, wherein the sand blocking precision of the sieve tube is changed from thick to thin until the exploitation of the exploitation well is finished.
By the implementation of the invention, the problems of yield reduction and even production stopping caused by the blockage of the adjacent wells such as the oil-gas well, the hydrate exploitation well and the like can be solved. The invention provides a variable-precision rotary blocking removal sieve tube, which can repeatedly and efficiently remove blocking, and simultaneously, the sand blocking precision of the sieve tube is adjusted in real time along with the development period of an oil field through the change of the relative positions of an inner tube and an outer tube. The sand blocking medium can also be filled in the annular space of the inner pipe and the outer pipe to be used as a conventional composite screen pipe.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A variable-precision rotary blocking removing sieve tube method is based on the variable-precision rotary blocking removing sieve tube and is characterized in that,
The variable-precision rotary blocking removal sieve tube comprises:
the surface of the pipe wall of the inner pipe is distributed with inner pipe sand blocking holes;
the surface of the pipe wall of the outer pipe is distributed with outer pipe sand blocking holes;
the inner pipe is sleeved in the pipe hole of the outer pipe, an annular gap exists between the inner pipe and the outer pipe, and the inner pipe and the outer pipe can rotate relatively;
The inner pipe comprises an inner pipe base pipe body, and the front end and the rear end of the inner pipe base pipe body are respectively used as an inner pipe male connector and an inner pipe female connector; spring buckles are arranged on the outer surfaces of the circumferences of the pipe walls of the inner pipe male connector and the inner pipe female connector at intervals;
The outer tube comprises an outer tube base tube body, and the front end and the rear end of the outer tube base tube body are respectively used as an outer tube male connector and an outer tube female connector; an outer pipe pressing groove corresponding to the spring buckle is formed in the inner surface of the circumference of the pipe wall of the outer pipe male connector and the outer pipe female connector at intervals;
The device also comprises a power pipe; a power tube positioning groove is also arranged in the inner tube; the power tube is matched with a spring clamping mechanism which is matched with the power tube positioning groove so as to drive the inner tube to rotate by the power tube;
the spring buckle comprises a spring base, a spring is assembled in the spring base and is pressed by a telescopic positioning pressing sheet, and a telescopic positioning pressing sheet sleeve is sleeved on the telescopic positioning pressing sheet;
The method comprises the following steps:
step 1: the power pipe is connected and lowered through the derrick and is placed in the inner pipe, and the power pipe is fixed with the inner pipe through a spring clamping mechanism assembled by the power pipe;
Step 2: pumping a blocking removing medium to the bottom of a well through pumping equipment of the ground or a platform;
Step 3: when the blocking removing medium is pumped, the top driving device of the derrick is utilized to drive the power pipe to rotate, the power pipe transmits the rotating torque to the inner pipe through the spring clamping mechanism on the power pipe to drive the inner pipe to rotate at a set speed, the inner pipe and the outer pipe are kept connected through the spring clamping buckle, and the requirements that the inner pipe rotates in the outer pipe and the axial position is maintained to be stable are met; the inner pipe rotates in the outer pipe, the inner pipe sand blocking holes and the outer pipe sand blocking holes are overlapped in different modes, different interception areas can be generated, and under the same blockage removal medium displacement, the flow speed periodically fluctuates to remove blockage substances;
Step 4: after the blocking removing medium acts on the screen pipe and the near-well zone stratum for a certain period, the blocking of the screen pipe and the near-well zone pore is removed, and the seepage channel is recovered;
Step 5: at the moment, according to stratum physical parameters and the exploitation requirements of oil and gas wells and hydrates, after rotating a power pipe for a certain angle, the power pipe is kept stable, at the moment, the overlapping mode of the inner pipe sand blocking holes and the outer pipe sand blocking holes is changed from the initial well entering mode, and the sand blocking precision of the sieve tube is changed; the specific range of the sand blocking precision is determined according to the specific conditions of different oil and gas fields and hydrate reservoirs;
Step 6: when the oil-gas well and the hydrate resource are developed for a certain period, the screen pipe is plugged again, and the steps 2-3 are repeated until the screen pipe is plugged;
Step 7: and when the oil-gas well and hydrate resources are developed to the end stage, repeating the steps 2-5, wherein the sand blocking precision of the sieve tube is changed from thick to thin until the exploitation of the exploitation well is finished.
2. The variable precision rotary blocking removal method of claim 1, wherein the slot depth of the power pipe positioning slot is greater than the slot depth of the outer pipe tabletting slot.
3. The variable-precision rotary blocking removal screening method according to claim 1, wherein the power pipe positioning grooves are distributed at intervals along the circumferential direction A DEG, and the inner pipe sand blocking holes are distributed at intervals along the circumferential direction B DEG; wherein A, B is an integer and A is larger than B, but A is not a multiple of B, so as to ensure that the fit between the inner tube and the outer tube is changed after the inner tube rotates by A degrees, and the overlapped overflow area is changed.
4. The method for removing the blockage by the variable precision rotation according to claim 1, wherein in the process of driving the inner pipe to rotate by the power pipe, the telescopic positioning pressing sheet tends to be flat due to bending, the spring is compressed, and when the spring rotates to a next outer pipe pressing sheet groove, the spring is compressed to be stretched, and the telescopic positioning pressing sheet is flat to bend, so that the positioning and the fixing of the inner pipe and the outer pipe are realized.
5. The variable-precision rotary blocking removal screening method according to claim 1, wherein the power pipe positioning grooves are distributed at intervals along the circumferential direction A DEG, and the inner pipe sand blocking holes are distributed at intervals along the circumferential direction B DEG; wherein A, B is an integer and A is larger than B, but A is a multiple of B, so as to ensure that the fit between the inner tube and the outer tube is not changed after the inner tube rotates by A degrees, and the overlapped overflow area is not changed.
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| CN202210934093.XA CN115450589B (en) | 2022-08-04 | 2022-08-04 | Variable-precision rotary blocking removal sieve tube and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116357272B (en) * | 2023-05-26 | 2023-08-15 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Anti-blocking geothermal well screen pipe for geothermal exploitation |
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| CN115450589A (en) | 2022-12-09 |
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