CN115788331A - Downhole rotatable shaft cleaning tool - Google Patents
Downhole rotatable shaft cleaning tool Download PDFInfo
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- CN115788331A CN115788331A CN202211358230.6A CN202211358230A CN115788331A CN 115788331 A CN115788331 A CN 115788331A CN 202211358230 A CN202211358230 A CN 202211358230A CN 115788331 A CN115788331 A CN 115788331A
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Abstract
The invention relates to the technical field of oil development, and provides a downhole rotatable shaft cleaning tool which comprises a shell, a motor assembly and a rotary spray head, wherein the motor assembly and the rotary spray head are sequentially arranged in the shell from top to bottom, an annular space and a working cavity are sequentially formed in the shell from top to bottom, a connecting hole is formed in the bottom wall of the annular space and is communicated with the annular space and the working cavity, the motor assembly comprises a rotor and a transmission shaft, the rotor at the upper end is rotatably arranged on the top wall of the working cavity, the transmission shaft and the rotary spray head are sequentially connected at the lower end, a spiral groove is formed in the side wall of the rotor, a liquid outlet channel is formed in the transmission shaft, a liquid inlet hole is formed in the rotary spray head, a plurality of liquid spray ports are formed in the lower end of the rotary spray head and are communicated with the liquid inlet hole and the liquid outlet channel, and the rotary spray head extends out of the shell. Through above-mentioned technical scheme, the too big flow can increase the pressure of pump, the problem of increase cost when having solved among the prior art and improving fluid circulation speed.
Description
Technical Field
The invention relates to the technical field of petroleum development, in particular to a downhole rotatable shaft cleaning tool.
Background
With the development of science and technology and the improvement of the living standard of people, the worldwide demand of petrochemical energy resources is continuously increased. The energy demand is not met, and a large amount of capital and human resources are invested in all countries in the world. Wellbore cleanout problems have long been recognized as the most obvious and serious problem in horizontal or deviated wells, on the one hand, debris accumulates on the low annulus side of the wellbore, resulting in reduced flow and drilling complications; on the other hand, during shale gas completion, bridge plug debris and debris particles tend to remain downhole and are difficult to clean, which poses serious risks to wellbore operations and reduces productivity, and this problem is particularly complicated for heavy oil formations containing asphaltenes, sand and other difficult-to-clean materials. To increase oil and gas production capacity, the impurities must be cleaned after a certain depth of deposition downhole. Even if these residues are continuously deposited in the wellbore, the risks of high torque, high resistance, sticking, etc. may occur during the operation.
Currently, the mainstream wellbore cleaning modes in the world mainly include three types: positive circulation well flushing, reverse circulation well flushing and mixed circulation well flushing. The positive circulation well washing is that drilling fluid (or drilling fluid) is pumped into a cleaning tool from a drill string channel, the drilling fluid passes through the cleaning tool with a nozzle structure, high-pressure drilling fluid emits high-pressure jet flow from a nozzle of the cleaning tool to clean a shaft and transfers impurities at the bottom of the shaft out through the circulation of the high-pressure drilling fluid to return to a ground circulation pool, and because the return flow of the drilling fluid in the shaft annulus is limited by the flow of the nozzle of the cleaning tool, certain impurities with higher specific gravity cannot circulate to the surface of a well along with drilling fluid; the reverse circulation well washing is that the drilling fluid (or drilling fluid) enters the oil, the sleeve and the annular space through a high-pressure pump, impurities in a shaft are washed, the circulating fluid is pressed into a drill column channel, and the impurities are circulated into a ground liquid storage tank. In the reverse circulation well flushing process, the drilling fluid (or the drilling fluid) is fast to read circularly and alternately, and the impurity cleaning speed is high in efficiency, so that the reverse circulation well flushing process is widely used, but due to the limitation of the flushing pressure of the fluid, the reverse circulation well flushing process cannot clean certain impurities adhered in a shaft, such as: bitumen, some hard to clean impurities around a wellbore fracture, etc.; the mixed circulation well washing integrates the advantages of positive circulation well washing and reverse circulation well washing, and can be alternately used in a proper environment, so that the efficiency is improved. Increasing the fluid circulation rate is one of the most reliable ways to increase the efficiency of wellbore cleaning in the drilling industry. However, excessive flow increases pump pressure and increases cost, which is more likely to damage the wellbore wall, resulting in wellbore erosion and loss.
Disclosure of Invention
The invention provides a downhole rotatable shaft cleaning tool, which solves the problems that in the related art, when the fluid circulation speed is increased, too large flow can increase the pressure of a pump and increase the cost.
The technical scheme of the invention is as follows: rotatable pit shaft cleaning means in pit, including the shell, down set gradually from last motor element and rotatory nozzle in the shell, annular space and working chamber have down been seted up in proper order from last to the shell is inside, the annular space diapire is equipped with the connecting hole, the connecting hole intercommunication annular space and working chamber, motor element includes rotor and transmission shaft, the rotor rotates and sets up working chamber, lower extreme have connected gradually the transmission shaft with rotatory nozzle, the rotor lateral wall is equipped with the helicla flute, liquid outlet channel has in the transmission shaft, be equipped with the feed liquor hole in the rotatory nozzle, the lower extreme is equipped with a plurality of hydrojet mouths, and is a plurality of hydrojet mouth with the feed liquor hole with liquid outlet channel intercommunication, rotatory nozzle stretches out the shell.
As a further technical solution, it is proposed that,
the utility model discloses a rotor, including rotor, working chamber, annular space, rotor, the rotor has central passage in the rotor, the annular space with central passage intercommunication, the rotor bottom is equipped with the liquid outlet, the liquid outlet with central passage with the working chamber intercommunication.
As a further technical solution, it is proposed that,
and a flow control nozzle is arranged in the annular space and is communicated with the central channel.
As a further technical solution, the method comprises the following steps,
be equipped with in the casing and prevent falling the nut, it is located to prevent falling the nut accuse and flowing nozzle lower part, threaded connection has the screw rod on preventing falling the nut, laminating on the screw rod accuse flows the nozzle, and the lower extreme rotates and is equipped with the rotor, the through-hole has in the screw rod, the through-hole intercommunication accuse flow the nozzle with central channel.
As a further technical solution, it is proposed that,
the bottom of the rotor is sequentially connected with an upper petal sleeve, a connecting rod, a universal joint, a lower petal sleeve, the transmission shaft and the rotary spray head.
As a further technical solution, the method comprises the following steps,
and scraping ribs are arranged on the side wall of the rotary spray head.
The working principle and the beneficial effects of the invention are as follows:
according to the invention, the annular space in the shell is communicated with the cleaning pump, the cleaning pump can convey drilling fluid into the annular space, and finally the drilling fluid flows into the working cavity from the connecting hole at the bottom of the annular space, because the drilling fluid is pressurized by the cleaning pump and then conveyed into the annular space, the drilling fluid entering the working cavity has water pressure, the hydraulic pressure provided by the drilling fluid impacts the spiral groove on the rotor to further urge the rotor to rotate, the transmission shaft below the rotor can be driven to rotate after the rotation, and further the rotary spray head is driven to rotate, the drilling fluid flowing downwards from the spiral groove of the rotor flows to the liquid inlet hole in the rotary spray head from the liquid storage channel in the transmission shaft, and is finally sprayed out from the liquid spray port, the side wall of the rotary spray head can be provided with the crushing piece, the rotary spray head can crush impurities in the well while rotating, and the circulation of the drilling fluid in the shaft is convenient; when the shaft is cleaned, on the premise of not increasing the pump pressure of the cleaning pump, the drilling fluid washes and the rotary nozzle crushes impurities, so that the cleaning efficiency of the shaft is greatly improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a downhole rotatable wellbore cleaning tool of the present invention;
FIG. 2 is a schematic view of a rotor structure according to the present invention;
FIG. 3 is a schematic view of a rotary sprayer according to the present invention;
FIG. 4 is a schematic view of a flow control nozzle according to the present invention;
FIG. 5 is an enlarged view of a portion A of FIG. 1;
in the figure: 1. the device comprises a shell, 2 parts of a rotary spray head, 3 parts of an annular space, 4 parts of a working cavity, 5 parts of a connecting hole, 6 parts of a rotor, 7 parts of a transmission shaft, 8 parts of a lower petal sleeve, 9 parts of a spiral groove, 10 parts of a liquid outlet channel, 11 parts of a liquid spraying opening, 12 parts of a liquid inlet hole, 13 parts of a central channel, 14 parts of a liquid outlet, 15 parts of a flow control nozzle, 16 parts of a falling-preventing nut, 17 parts of a screw rod, 18 parts of a through hole, 19 parts of an upper petal sleeve, 20 parts of a connecting rod, 21 parts of a universal joint, 22 parts of scraping ribs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
As shown in fig. 1-5, this embodiment has provided rotatable pit shaft cleaning means in pit, including shell 1, from last down set gradually motor subassembly and rotatory nozzle 2 in the shell 1, 1 is inside from last down seted up annular space 3 and working chamber 4 in proper order, 3 diapalls in annular space are equipped with connecting hole 5, connecting hole 5 intercommunication annular space 3 and working chamber 4, motor subassembly includes rotor 6 and transmission shaft 7, rotor 6 rotates to set up working chamber 4, the lower extreme has connected gradually transmission shaft 7 with rotatory nozzle 2, 6 lateral walls of rotor are equipped with helicla flute 9, play liquid channel 10 has in the transmission shaft 7, be equipped with feed liquor hole 12 in rotatory nozzle 2, the lower extreme is equipped with a plurality of hydrojet mouths 11, and is a plurality of hydrojet mouths 11 with feed liquor hole 12 with play liquid channel 10 intercommunication, rotatory nozzle 2 stretches out shell 1.
In the embodiment, a cleaning pump is communicated with an annulus 3 in a shell 1, the cleaning pump can convey drilling fluid into the annulus 3, and finally the drilling fluid flows into a working cavity 4 from a connecting hole 5 at the bottom of the annulus 3, because the drilling fluid is pressurized by the cleaning pump and then conveyed into the annulus 3, the drilling fluid entering the working cavity 4 has water pressure, the hydraulic pressure provided by the drilling fluid impacts a spiral groove 9 on a rotor 6 to further urge the rotor 6 to rotate, a transmission shaft 7 below the drilling fluid can be driven to rotate after the drilling fluid rotates, so that a rotary spray head 2 is driven to rotate, the rotor is connected with the transmission shaft 7, a liquid outlet passage 10 in the transmission shaft 7 is communicated with the working cavity 4, the drilling fluid flowing downwards from the spiral groove 9 of the rotor 6 can flow to a liquid inlet hole 12 in the rotary spray head 2 from a liquid outlet passage 10 in the transmission shaft 7 and finally is sprayed out from a liquid spray port 11, a crushing piece can be arranged on the side wall of the rotary spray head 2, impurities in a well can be crushed while the rotary spray head 2 rotates, and the circulation of the drilling fluid in a shaft is convenient; when the shaft is cleaned, on the premise of not increasing the pump pressure of the cleaning pump, the drilling fluid washes and the rotary nozzle 2 crushes impurities, so that the cleaning efficiency of the shaft is greatly improved.
Further, the method also comprises the following steps of,
have central passage 13 in the rotor 6, annular space 3 with central passage 13 intercommunication, rotor 6 bottom is equipped with liquid outlet 14, liquid outlet 14 with central passage 13 with working chamber 4 intercommunication.
In this embodiment, the drilling fluid flows from a portion of the annular space 3 to the working chamber 4 to power the rotor 6, and a portion of the drilling fluid flows to the central passage 13 inside the rotor 6, and finally flows from the fluid outlet 14 at the bottom of the rotor 6 to the working chamber 4; because after all drilling fluids directly flow to working chamber 4, make the pressure in the working chamber 4 too big easily, and then make the rotational speed of rotor 6 too big, the too big back of rotor 6 rotational speed damages 1 inner wall of shell, reduces the life of this device greatly, consequently shunts the processing to the drilling fluids, under the sufficient circumstances of satisfying the drilling fluids, makes rotor 6 can the stable operation again.
Further, the method also comprises the following steps of,
a flow control nozzle 15 is arranged in the annular space 3, and the flow control nozzle 15 is communicated with the central channel 13.
In this embodiment, the flow control nozzle 15 is annular and is used to control the flow rate of the drilling fluid flowing into the central passage 13, and the size of the middle hole of the flow control nozzle 15 is changed by changing the size of the flow control nozzle 15, so as to change the flow rate of the drilling fluid flowing into the central passage 13.
Further, the method also comprises the following steps of,
be equipped with in the casing and prevent falling nut 16, prevent falling nut 16 and be located accuse stream nozzle 15 lower part, threaded connection has screw rod 17 on preventing falling nut 16, the laminating of screw rod 17 upper end accuse stream nozzle 15, the lower extreme rotates and is equipped with rotor 6, through-hole 18 has in the screw rod 17, through-hole 18 intercommunication accuse stream nozzle 15 with central channel 13.
In this embodiment, rotor 6 rotates on screw rod 17, compares with the support rotation at 4 roof of working chamber, and rotor 6 rotates and can conveniently change on screw rod 17, and screw rod 17 has lengthened the distance between rotor 6 and the annular space 3, and the effectual drilling fluid of having carried out the decompression, can prevent to make rotor 6 rotational speed too big after drilling fluid pressure is too big, and then damage 1 inner wall of shell.
Further, the method also comprises the following steps of,
the bottom of the rotor 6 is sequentially connected with an upper petal sleeve 19, a connecting rod 20, a universal joint 21, a lower petal sleeve 8, the transmission shaft 7 and the rotary spray head 2.
In this embodiment, because rotor 6 is not the laminating state with the 4 lateral walls in working chamber, consequently can take place the swing when the rotor rotates, through insert connecting rod 20 and universal joint 21 in rotor 6 bottom, prevent that rotor 6 from driving the rotatory nozzle 2 swing of below, and then improved rotatory nozzle 2's stability.
Further, the method also comprises the following steps of,
the side wall of the rotary spray head 2 is provided with scraping ribs 22.
In this embodiment, the scraping ribs 22 are spiral, and grooves are formed between the adjacent scraping ribs 22, so that impurities can be guided into the spiral grooves, the crushing time of the impurities is prolonged, and the crushing efficiency is improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Rotatable pit shaft cleaning means in pit, down set gradually including shell (1), from last motor element and rotatory nozzle (2) in shell (1), its characterized in that, shell (1) is inside from last annular space (3) and working chamber (4) down having seted up in proper order, annular space (3) diapire is equipped with connecting hole (5), connecting hole (5) intercommunication annular space (3) and working chamber (4), motor element includes rotor (6) and transmission shaft (7), rotor (6) rotate to set up working chamber (4), the lower extreme has connected gradually transmission shaft (7) with rotatory nozzle (2), rotor (6) lateral wall is equipped with helicla flute (9), liquid outlet channel (10) has been had in transmission shaft (7), be equipped with feed liquor hole (12) in rotatory nozzle (2), the lower extreme is equipped with a plurality of liquid jet (11), a plurality of liquid jet (11) with feed liquor hole (12) with liquid outlet channel (10) intercommunication, rotatory nozzle (2) are visited shell (1).
2. A downhole rotatable wellbore cleaning tool according to claim 1, wherein the rotor (6) has a central passage (13) therein, the annulus (3) is in communication with the central passage (13), and the rotor (6) is provided with a fluid outlet (14) at the bottom, the fluid outlet (14) being in communication with the central passage (13) and the working chamber (4).
3. A downhole rotatable wellbore cleaning tool according to claim 2, wherein a flow control nozzle (15) is arranged in the annulus (3), the flow control nozzle (15) being in communication with the central passage (13).
4. A downhole rotatable wellbore cleaning tool according to claim 3, wherein a drop-proof nut (16) is arranged in the housing, the drop-proof nut (16) is located at the lower part of the flow control nozzle (15), a screw (17) is screwed on the drop-proof nut (16), the upper end of the screw (17) is attached to the flow control nozzle (15), the lower end of the screw is rotatably provided with the rotor (6), a through hole (18) is arranged in the screw (17), and the through hole (18) is communicated with the flow control nozzle (15) and the central channel (13).
5. A downhole rotatable wellbore cleaning tool according to claim 1, wherein the bottom of the rotor (6) is connected with an upper petal sleeve (19), a connecting rod (20), a universal joint (21), a lower petal sleeve (8), the transmission shaft (7) and a rotary spray head (2) in sequence.
6. A downhole rotatable wellbore cleaning tool according to claim 1, wherein the side wall of the rotary jetting head (2) is provided with scraping ribs (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211358230.6A CN115788331A (en) | 2022-11-01 | 2022-11-01 | Downhole rotatable shaft cleaning tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211358230.6A CN115788331A (en) | 2022-11-01 | 2022-11-01 | Downhole rotatable shaft cleaning tool |
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| Publication Number | Publication Date |
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| CN115788331A true CN115788331A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211358230.6A Pending CN115788331A (en) | 2022-11-01 | 2022-11-01 | Downhole rotatable shaft cleaning tool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118728323A (en) * | 2024-09-04 | 2024-10-01 | 中海油能源发展股份有限公司采油服务分公司 | Screen cleaning device for coalbed methane wells |
-
2022
- 2022-11-01 CN CN202211358230.6A patent/CN115788331A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118728323A (en) * | 2024-09-04 | 2024-10-01 | 中海油能源发展股份有限公司采油服务分公司 | Screen cleaning device for coalbed methane wells |
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