CN112523726A - Wax scraping and cleaning tool for continuous oil pipe and using method thereof - Google Patents
Wax scraping and cleaning tool for continuous oil pipe and using method thereof Download PDFInfo
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- CN112523726A CN112523726A CN201910874177.7A CN201910874177A CN112523726A CN 112523726 A CN112523726 A CN 112523726A CN 201910874177 A CN201910874177 A CN 201910874177A CN 112523726 A CN112523726 A CN 112523726A
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- spiral
- scraping
- wax
- wax scraping
- pipe
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
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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
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
Abstract
The invention relates to a wax scraping and cleaning tool for a continuous oil pipe and a using method thereof, wherein the tool comprises a wax scraping structure, the wax scraping structure comprises a shunting inner pipe, a forward spiral wax scraping part and a reverse spiral wax scraping part are axially sleeved on the shunting inner pipe at intervals, inner spiral hydraulic rotating pipes are arranged inside the forward spiral wax scraping part and the reverse spiral wax scraping part and are used for driving the forward spiral wax scraping part and the reverse spiral wax scraping part to rotationally scrape wax; a paraffin removal structure is propped between the positive spiral paraffin scraping part and the negative spiral paraffin scraping part and is used for axial and radial jet cleaning; the bottom intercommunication of reposition of redundant personnel inner tube sets up the direction and washes the structure, and the top intercommunication of reposition of redundant personnel inner tube sets up spacing seal structure. The oil well oil pipe and the sleeve can be thoroughly stripped and washed in wax precipitation, the wax precipitation influence of the oil well is reduced, the operation period is shortened, the normal production time of the oil well is prolonged, and the operation requirements of the oil well on rapidness, high efficiency and low cost are met.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering, in particular to a wax scraping and cleaning tool for a coiled tubing and a using method thereof.
Background
During the lifting process of a shaft, the wax-containing crude oil begins to be separated out along with the change of conditions such as temperature loss, dissolved gas separation, formation pressure reduction and the like, and is gradually adhered, bonded and hardened on the inner wall of an oil pipe along with the production. After long-time production, the oil outlet flow channel is reduced, the oil flow resistance is increased, the load of the underground unit is increased, and the load of the rod column is increased until the oil well can not produce.
The wax instrument of scraping in pit that present oil field adopted generally is latus rectum scraper, mainly has following problem: the resistance in the process of lifting and lowering the pipe column is large, the wax scraping speed is low, the clamping is easy, and the wax removal is not thorough; and secondly, the drift diameter paraffin scraper which drives the scraper to rotate only by the hydraulic impact motor improves the paraffin scraping speed, but the paraffin removing time is still longer, the paraffin scraping and removing are not thorough, the phenomenon of hard blocking and pressure holding of a paraffin scraping tool exists, the well washing water consumption is large, and the paraffin removing period is not ideal.
Therefore, the inventor provides a wax scraping and cleaning tool for a coiled tubing and a using method thereof by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a paraffin scraping and cleaning tool for a continuous oil pipe and a using method thereof, which solve the problems that the conventional method is not thorough in paraffin scraping and well cleaning during construction, multiple in construction procedures and increased in construction cost caused by prolonging the construction period.
The invention aims to realize the wax scraping and cleaning tool for the continuous oil pipe, which comprises a wax scraping structure, wherein the wax scraping structure comprises a shunting inner pipe, a positive spiral wax scraping part and a negative spiral wax scraping part are axially and alternately sleeved on the shunting inner pipe, inner spiral hydraulic rotating pipes are respectively arranged in the positive spiral wax scraping part and the negative spiral wax scraping part and are used for driving the positive spiral wax scraping part and the negative spiral wax scraping part to rotationally scrape wax; a paraffin removal structure is arranged between the positive spiral paraffin scraping part and the negative spiral paraffin scraping part in a propping manner, and the paraffin removal structure is used for axial and radial jet flow cleaning; the bottom intercommunication of reposition of redundant personnel inner tube sets up the direction and washes the structure, the top intercommunication of reposition of redundant personnel inner tube sets up spacing seal structure.
In a preferred embodiment of the present invention, a first diversion window is disposed at the same axial position on the side wall of the diversion inner tube corresponding to the forward-spiral wax scraping portion, a second diversion window is disposed at the same axial position on the side wall of the diversion inner tube corresponding to the reverse-spiral wax scraping portion, outer cylinder windows are disposed at the lower portions of the outer walls of the forward-spiral wax scraping portion and the reverse-spiral wax scraping portion, the inner cavity of the diversion inner tube forms a liquid inner flow passage, the first diversion window, the inner cavity of the forward-spiral wax scraping portion, the outer cylinder window on the forward-spiral wax scraping portion form a first liquid outer flow passage, and the second diversion window, the inner cavity of the reverse-spiral wax scraping portion, and the outer cylinder window on the reverse-spiral wax scraping portion form a second liquid outer flow passage.
In a preferred embodiment of the present invention, the positive-spiral wax scraping portion includes a first outer cylinder radially and alternately sleeved outside the shunt inner tube, the top and the bottom of the first outer cylinder are both hermetically sleeved on the shunt inner tube, a positive-spiral wax scraping sheet is disposed on an outer wall of the first outer cylinder, the first shunt window is disposed on a side wall of the shunt inner tube at a position opposite to an upper portion of the first outer cylinder, the outer cylinder window is disposed on a lower portion of the side wall of the first outer cylinder, and the inner-spiral hydraulic rotating tube is disposed on an inner wall of the first outer cylinder above the outer cylinder window; the top of the first outer barrel is connected with the limiting sealing structure in a sealing and rotating mode through a first rotary sealer, and the bottom of the first outer barrel is connected with the paraffin removal structure in a sealing and rotating mode through a second rotary sealer.
In a preferred embodiment of the present invention, the inverse-spiral wax scraping portion includes a second outer cylinder radially and alternately sleeved outside the diversion inner pipe, the top and the bottom of the second outer cylinder are both hermetically sleeved on the diversion inner pipe, an inverse-spiral wax scraping sheet is disposed on the outer wall of the second outer cylinder, the second diversion window is disposed on a position of the side wall of the diversion inner pipe opposite to the upper portion of the second outer cylinder, the outer cylinder window is disposed on the lower portion of the side wall of the second outer cylinder, and the inner spiral hydraulic rotating pipe is disposed on the inner wall of the second outer cylinder above the outer cylinder window; the top of the second outer barrel is connected with the paraffin removal structure in a sealing and rotating mode through a third rotary sealer, and the bottom of the second outer barrel is connected with the guide flushing structure in a sealing and rotating mode through a fourth rotary sealer.
In a preferred embodiment of the present invention, the outer wall of the first outer cylinder is provided with 3 positive-spiral wax scraping sheets, and the spiral interval between two adjacent positive-spiral wax scraping sheets is 120 °; the outer wall of the second outer barrel is provided with 3 reverse-spiral wax scraping sheets, and the spiral interval between every two adjacent reverse-spiral wax scraping sheets is 120 degrees.
In a preferred embodiment of the present invention, the paraffin removal structure includes a jet pipe having a jet through hole on a side wall thereof, the jet pipe is connected in series between the forward spiral paraffin scraping portion and the reverse spiral paraffin scraping portion, an axial jet nozzle and a radial jet nozzle are disposed on an outer wall of the jet pipe, and a centering portion is coaxially sleeved on a bottom of the jet pipe.
In a preferred embodiment of the invention, the guide flushing structure comprises a guide head with a sealed bottom, and a guide flushing nozzle is arranged on a side wall of the guide head.
In a preferred embodiment of the present invention, the bottom end of the guiding head is arranged in a conical surface with a diameter gradually decreasing from top to bottom.
In a preferred embodiment of the present invention, the limiting sealing structure includes a limiting sealing sleeve which is sealingly sleeved on the top of the shunt inner tube, the limiting sealing sleeve is used for axially limiting the inner spiral hydraulic rotating tube in the positive spiral wax scraping portion, and the top end of the limiting sealing sleeve is connected to the safety connector.
The object of the invention can also be achieved by a method for using the wax scraping cleaning tool for the coiled tubing, which comprises the following steps:
step a, connecting the continuous oil pipe with the oil pipe by using a wax scraping and cleaning tool;
b, preparing liquid for wax scraping and cleaning;
c, putting the coiled tubing into the well by using a wax scraping and cleaning tool;
d, preheating a wellhead;
e, pressurizing injection liquid to start wax scraping and cleaning work; a part of liquid impacts the inner spiral hydraulic rotating pipe to drive the inner spiral hydraulic rotating pipe to rotate, and the inner spiral hydraulic rotating pipe rotates and drives the positive spiral wax scraping part and the reverse spiral wax scraping part to rotate and scrape wax; a part of liquid is sprayed axially and radially through the paraffin removal structure to clean the pipe wall;
and f, scraping wax and cleaning to a target well section, performing hot washing for a circle, lifting the pipe column, and taking out the continuous oil pipe and the well repairing tool after the well repairing operation is finished.
From the above, the wax scraping and cleaning tool for the coiled tubing and the use method thereof provided by the invention have the following beneficial effects:
in the wax scraping and cleaning tool for the continuous oil pipe and the use method thereof, the inner spiral hydraulic rotating pipe drives the positive spiral wax scraping part and the negative spiral wax scraping part to rotate, so that the comprehensive dead-corner-free wax scraping function in the oil pipe and the sleeve is realized; axial and radial cleaning of the paraffin removal structure is realized, and thorough cleaning of the oil pipe and the sleeve is realized; the guide flushing structure is used for softening before wax scraping, boosting backflow liquid and guiding a tool; the limiting sealing structure realizes the top sealing of the wax scraping structure and the connection with the upper oil pipe; the wax scraping and cleaning tool for the coiled tubing is integrally designed with wax scraping, cleaning, guiding and sealing structures, wax scraping and cleaning are completed at one time, a tubular column does not need to be frequently lifted and lowered in conventional operation, production time is not influenced basically particularly during wax removal of an electric pump well, and the operation is simple, convenient and efficient; the wax scraping and cleaning tool for the coiled tubing and the use method thereof realize thorough stripping and washing of wax precipitation of the oil well oil pipe and the casing, reduce the wax precipitation influence of the oil well, reduce the operation period, prolong the normal production time of the oil well and realize the operation requirements of the oil-water well on rapidness, high efficiency and low cost.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is a schematic diagram of the wax scraping cleaning tool for the coiled tubing.
In the figure:
100. the coiled tubing is cleaned by a wax scraping cleaning tool;
1. a wax scraping structure;
10. a shunt inner tube; 101. a first offload window; 102. a second shunting window;
11. a positive spiral wax scraping part; 111. a first outer barrel; 112. a positive spiral wax scraping sheet;
12. a reverse-spiral wax scraping part; 121. a second outer barrel; 122. an inverse spiral wax scraping sheet;
13. an internal spiral hydraulic rotating pipe; 14. an outer barrel window;
2. a paraffin removal structure;
21. a jet pipe; 22. an axial jet nozzle; 23. a radial jet nozzle; 24. a righting part;
3. a guided flushing structure;
31. a guide head; 32. a pilot flush nozzle;
4. a limiting sealing structure;
41. a limiting sealing sleeve; 42. safe connector.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the invention provides a wax scraping and cleaning tool 100 for a coiled tubing, which comprises a wax scraping structure 1, wherein the wax scraping structure 1 comprises a shunt inner tube 10, a forward spiral wax scraping part 11 and a reverse spiral wax scraping part 12 are axially sleeved on the shunt inner tube 10 at intervals, inner spiral hydraulic rotating tubes 13 are respectively arranged inside the forward spiral wax scraping part 11 and the reverse spiral wax scraping part 12, and the inner spiral hydraulic rotating tubes 13 are used for driving the forward spiral wax scraping part 11 and the reverse spiral wax scraping part 12 to rotate and scrape wax; a paraffin removal structure 2 is arranged between the positive spiral paraffin scraping part 11 and the negative spiral paraffin scraping part 12 in a propping manner, and the paraffin removal structure 2 is used for axial and radial jet flow cleaning; the bottom of the shunt inner pipe 10 is communicated with a guide flushing structure 3, the guide flushing structure is used for flushing and softening paraffin and scale before paraffin scraping, providing thrust for the flowback liquid, boosting the flowback liquid and guiding tools; the top of the shunt inner pipe 10 is communicated with a limiting sealing structure 4, and the limiting sealing structure 4 is connected with the upper continuous oil pipe.
In the wax scraping and cleaning tool for the continuous oil pipe, the inner spiral hydraulic rotating pipe drives the positive spiral wax scraping part and the negative spiral wax scraping part to rotate, so that the wax scraping function of the oil pipe and the casing pipe without dead corners is realized; axial and radial cleaning of the paraffin removal structure is realized, and thorough cleaning of the oil pipe and the sleeve is realized; the guide flushing structure is used for softening before wax scraping, boosting backflow liquid and guiding a tool; the limiting sealing structure realizes the top sealing of the wax scraping structure and the connection with the upper oil pipe; the wax scraping and cleaning tool for the coiled tubing is integrally designed with wax scraping, cleaning, guiding and sealing structures, wax scraping and cleaning are completed at one time, a tubular column does not need to be frequently lifted and lowered in conventional operation, production time is not influenced basically particularly during wax removal of an electric pump well, and the operation is simple, convenient and efficient; the wax scraping and cleaning tool for the coiled tubing provided by the invention has the advantages that the wax precipitation of the tubing and the casing of the oil well is thoroughly stripped and washed, the wax precipitation influence of the oil well is reduced, the operation period is shortened, the normal production time of the oil well is prolonged, and the operation requirements of the oil-water well on rapidness, high efficiency and low cost are met.
Further, as shown in fig. 1, a first diversion window 101 is provided at the same axial position on the side wall of the diversion inner tube 10 corresponding to the forward-spiral wax scraping section 11, a second diversion window 102 is provided at the same axial position on the side wall of the diversion inner tube 10 corresponding to the reverse-spiral wax scraping section 12, outer cylinder windows 14 are provided at the lower portions of the outer walls of the forward-spiral wax scraping section 11 and the reverse-spiral wax scraping section 12, the inner cavity of the diversion inner tube 10 constitutes a liquid inner flow passage, the first diversion window 101, the inner cavity of the forward-spiral wax scraping section 11, and the outer cylinder window 14 on the forward-spiral wax scraping section 11 constitute a first liquid outer flow passage, and the second diversion window 102, the inner cavity of the reverse-spiral wax scraping section 12, and the outer cylinder window 14 on the reverse-spiral wax scraping section 12 constitute a second liquid outer.
When the device works, a part of high-pressure liquid flows to the inner cavity of the positive-spiral wax scraping part 11 from the liquid inner flow passage, the liquid impacts the inner spiral hydraulic rotary pipe 13 to drive the inner spiral hydraulic rotary pipe to rotate, the inner spiral hydraulic rotary pipe 13 drives the positive-spiral wax scraping part 11 to rotate to scrape wax while rotating, the liquid for impact flows to the annular space from the first liquid outer flow passage, pressure holding is avoided (if the inner cavity of the positive-spiral wax scraping part 11 is sealed, the pressure holding is caused by blocking when the positive-spiral wax scraping part 11 scrapes wax), and scraped objects can be washed; some high-pressure liquid scrapes the inner chamber of wax portion 12 from the internal flow path flow direction contra-helix from the liquid, and liquid strikes inside spin water power rotatory pipe 13 and drives its rotation, and inside spin water power rotatory pipe 13 drives the contra-helix when rotatory and scrapes wax portion 12 rotation and scrapes the wax, and the liquid of assaulting the usefulness is from the external flow path flow direction annular space of second liquid, avoids suppressing pressure (if the contra-helix scrapes that the inner chamber of wax portion 12 is sealed, meets the jam and can lead to suppressing pressure when the wax is scraped to the contra-helix, and can erode scraping the junk. The positive-spiral wax scraping part 11 and the reverse-spiral wax scraping part 12 are used for rotary scraping, so that the comprehensive dead-angle-free wax scraping function in an oil pipe and a sleeve is realized, and meanwhile, the design of an inner flow channel and an outer flow channel (an axially through liquid inner flow channel, an axially spaced first liquid outer flow channel and a second liquid outer flow channel) in the wax scraping structure 1 can eliminate the pressure holding caused by the fact that the wax scraping cleaning tool 100 for the continuous oil pipe is clamped; the arrangement of the positive-spiral wax scraping part 11 and the reverse-spiral wax scraping part 12 not only enables the wax scraping work to be more thorough, but also can offset the friction torque in the lifting and lowering process.
Further, as shown in fig. 1, the positive-spiral wax scraping part 11 includes a first outer cylinder 111 radially and spacedly sleeved outside the shunting inner pipe 10, the top and the bottom of the first outer cylinder 111 are hermetically sleeved on the shunting inner pipe 10, a positive-spiral wax scraping sheet 112 is arranged on the outer wall of the first outer cylinder 111, a first shunting window 101 is arranged on the side wall of the shunting inner pipe 10 opposite to the upper part of the first outer cylinder 111, an outer cylinder window 14 is arranged on the lower part of the side wall of the first outer cylinder 111, and an inner-spiral hydraulic rotating pipe 13 is arranged on the inner wall of the first outer cylinder 111 above the outer cylinder window 14, in a specific embodiment of the present invention, 3 first shunting windows 101 are uniformly distributed along the circumferential direction; the top of the first outer barrel 111 is connected with the limiting sealing structure 4 in a sealing and rotating mode through a first rotary sealer, and the bottom of the first outer barrel 111 is connected with the paraffin removal structure 2 in a sealing and rotating mode through a second rotary sealer. During operation, positive spiral wax scraping portion 11 is in the rotating state, and paraffin removal structure 2 and spacing seal structure 4 are in circumference fixed state, and rotatory sealed intercommunication can be realized to first rotary sealer and second rotary sealer.
Further, as shown in fig. 1, the inverse-spiral wax scraping part 12 includes a second outer cylinder 121 radially and spacedly sleeved outside the shunting inner pipe 10, the top and bottom of the second outer cylinder 121 are hermetically sleeved on the shunting inner pipe 10, an inverse-spiral wax scraping sheet 122 is arranged on the outer wall of the second outer cylinder 121, a second shunting window 102 is arranged on the side wall of the shunting inner pipe 10 opposite to the upper part of the second outer cylinder 121, an outer cylinder window 14 is arranged on the lower part of the side wall of the second outer cylinder 121, and an inner-spiral hydraulic rotating pipe 13 is arranged on the inner wall of the second outer cylinder 121 above the outer cylinder window 14, in a specific embodiment of the present invention, 3 second shunting windows 102 are uniformly distributed along the circumferential direction; the top of the second outer cylinder 121 is connected with the paraffin removal structure 2 through a third rotary sealer in a sealing and rotating manner, and the bottom of the second outer cylinder 121 is connected with the guide flushing structure 3 through a fourth rotary sealer in a sealing and rotating manner. During operation, the inverse spiral wax scraping part 12 is in a rotating state, the wax removing structure 2 and the guide flushing structure 3 are in a circumferential fixed state, and the third rotary sealer and the fourth rotary sealer can be communicated in a rotating and sealed mode.
As shown in fig. 1, in the present embodiment, 3 positive-spiral wax scraping strips 112 are provided on the outer wall of the first outer cylinder 111, and the spiral interval between two adjacent positive-spiral wax scraping strips 112 is 120 °; the outer wall of the second outer cylinder 121 is provided with 3 inverse-spiral wax scraping sheets 122, and the spiral interval between two adjacent inverse-spiral wax scraping sheets 122 is 120 degrees. 3 spiral pieces are uniformly arranged on the inner wall of the inner spiral hydraulic rotating pipe 13 at intervals in the circumferential direction.
Further, as shown in fig. 1, the paraffin removal structure 2 includes a jet pipe 21 with a jet through hole on the side wall, the jet pipe 21 is connected in series between the positive spiral paraffin scraping part 11 and the inverse spiral paraffin scraping part 12, an axial jet nozzle 22 and a radial jet nozzle 23 are arranged on the outer wall of the jet pipe 21, a centering part 24 is coaxially sleeved on the bottom of the jet pipe 21, the centering part 24 is coaxially arranged with the jet pipe 21, and the function of centering the center of the jet pipe 21 is realized. During operation, liquid flows to axial jet nozzle 22 and radial jet nozzle 23 through jet through-hole on jet pipe 21, and axial jet nozzle 22 carries out the axial efflux, realizes the cleaning function before oil pipe, sleeve pipe wax scraping front and back, and radial jet nozzle 23 carries out radial efflux, not only realizes cleaning function, has the function that promotes the timely flowback of scraping the junk simultaneously.
Further, as shown in fig. 1, the guiding and flushing structure 3 includes a guiding head 31 with a sealed bottom, and a guiding and flushing nozzle 32 is disposed on a side wall of the guiding head 31. To facilitate the lifting and lowering, the bottom end of the guiding head 31 is arranged in a conical surface with a diameter gradually reduced from top to bottom. During operation, the guide flushing nozzle 32 of the guide flushing structure 3 sprays liquid for washing and softening paraffin and scale before scraping wax, providing thrust for the backflow liquid, assisting the backflow liquid, and simultaneously playing a guiding role in the lowering process.
Further, as shown in fig. 1, the limiting sealing structure 4 includes a limiting sealing sleeve 41 which is sealed and disposed on the top of the shunt inner tube 10, the limiting sealing sleeve 41 is used for axially limiting the inner spiral hydraulic rotating tube 13 in the positive spiral wax scraping portion 11, and the top end of the limiting sealing sleeve 41 is connected to the safety connector 42. The limiting sealing sleeve 41 realizes the limiting sealing of the inner spiral hydraulic rotating pipe in the positive spiral wax scraping part 11; the safety coupling 42 is used to sealingly connect tubing (prior art).
The use method of the wax scraping and cleaning tool 100 for the coiled tubing comprises the following steps:
step a, connecting the wax scraping and cleaning tool 100 for the continuous oil pipe with the oil pipe: the coiled tubing (prior art) penetrates out of the injection head (prior art) through a tubing guide (prior art) of a coiled tubing truck (prior art), the upper end of a coiled tubing special connector (prior art) is connected with the coiled tubing, the lower end of the coiled tubing special connector is connected with a safety connector 42 of the limiting sealing structure 4, and the safety connector 42 is connected with the paraffin removal structure 2 and lower parts thereof;
step b, preparing liquid for wax scraping and cleaning:
the inlet end of the hot pump washing vehicle (prior art) is connected with the hot water tank vehicle (prior art), and the outlet end of the hot pump washing vehicle is connected with the coiled tubing vehicle, so as to provide liquid and power for hot washing circulation;
step c, putting the coiled tubing into the well by using the paraffin scraping and cleaning tool 100:
connecting the injector head (prior art) to the wellhead blowout preventer (prior art), lowering the coiled tubing into the well with the wax scraping cleaning tool 100 by lowering the coiled tubing; installing well mouth and liquid discharge pipeline (prior art), and implementing corresponding well repairing operation;
d, preheating a wellhead:
in view of the characteristics of high solidifying point temperature and high wax content of the high-condensation oil, when the coiled tubing is put into the well, hot water needs to be circulated at the well head for preheating, so that the coiled tubing is prevented from being incapable of circulating when wax is removed by hot washing after being put into the well by using the wax scraping and cleaning tool 100;
step e, pressurized liquid injection and wax scraping and cleaning: a part of liquid impacts the inner spiral hydraulic rotating pipe to drive the inner spiral hydraulic rotating pipe to rotate, and the inner spiral hydraulic rotating pipe rotates and drives the positive spiral wax scraping part and the reverse spiral wax scraping part to rotate and scrape wax; a part of liquid is sprayed axially and radially through the paraffin removal structure to clean the pipe wall;
the method comprises the following specific steps:
during normal construction, the hot pump washing vehicle continuously heats water coming from the tank car and pressurizes and injects the water into the continuous oil pipe; circulating hot water below the edge of the continuous oil pipe to carry out wax scraping and cleaning work;
at the beginning of liquid injection, high-pressure hot water is sprayed out through the guide flushing nozzle 32 of the guide flushing structure 3 to flush and soften paraffin and scale, provide thrust for the backflow liquid and assist the backflow liquid;
pressurizing operation is carried out, a part of high-pressure hot water flows to the inner cavity of the positive-helix wax scraping part 11 from the liquid inner flow passage (the inner cavity of the shunt inner pipe 10), the liquid impacts the inner-helix hydraulic rotating pipe 13 to drive the inner-helix hydraulic rotating pipe to rotate, the inner-helix hydraulic rotating pipe 13 drives the positive-helix wax scraping part 11 to rotate to scrape wax while rotating, the liquid for impact flows to the annular space from the first liquid outer flow passage, pressure holding is avoided, and scraped objects can be washed away; part of high-pressure hot water flows to the inner cavity of the inverse spiral wax scraping part 12 from the liquid inner flow passage, the liquid impacts the inner spiral hydraulic rotating pipe 13 to drive the inner spiral hydraulic rotating pipe to rotate, the inner spiral hydraulic rotating pipe 13 drives the inverse spiral wax scraping part 12 to rotate to scrape wax while rotating, and the liquid for impact flows to the annular space from the second liquid outer flow passage to avoid pressure build-up and wash scraped objects;
some high pressure hot water flows to axial jet nozzle 22 and radial jet nozzle 23 through efflux thru hole on jet pipe 21, and axial jet nozzle 22 carries out the axial efflux, realizes the cleaning function before oil pipe, sleeve pipe wax scraping front and back, and radial jet nozzle 23 carries out radial efflux, not only realizes cleaning function, has the function that promotes the timely flowback of scraping the junk simultaneously.
And f, scraping wax and cleaning to a target well section, performing hot washing for a circle, lifting the pipe column, and taking out the continuous oil pipe and the well repairing tool after the well repairing operation is finished.
One embodiment of the present invention is as follows: the paraffin removal construction is carried out on a branch well of a certain oilfield company by using the paraffin removal cleaning tool 100 for the coiled tubing, the well is a high pour-point oil electric pump well, and according to the process flow, the paraffin removal cleaning pipe column is successfully cleaned in one step, so that the construction is smooth.
From the above, the wax scraping and cleaning tool for the coiled tubing and the use method thereof provided by the invention have the following beneficial effects:
in the wax scraping and cleaning tool for the continuous oil pipe and the use method thereof, the inner spiral hydraulic rotating pipe drives the positive spiral wax scraping part and the negative spiral wax scraping part to rotate, so that the comprehensive dead-corner-free wax scraping function in the oil pipe and the sleeve is realized; axial and radial cleaning of the paraffin removal structure is realized, and thorough cleaning of the oil pipe and the sleeve is realized; the guide flushing structure is used for softening before wax scraping, boosting backflow liquid and guiding a tool; the limiting sealing structure realizes the top sealing of the wax scraping structure and the connection with the upper oil pipe; the wax scraping and cleaning tool for the coiled tubing is integrally designed with wax scraping, cleaning, guiding and sealing structures, wax scraping and cleaning are completed at one time, a tubular column does not need to be frequently lifted and lowered in conventional operation, production time is not influenced basically particularly during wax removal of an electric pump well, and the operation is simple, convenient and efficient; the wax scraping and cleaning tool for the coiled tubing and the use method thereof realize thorough stripping and washing of wax precipitation of the oil well oil pipe and the casing, reduce the wax precipitation influence of the oil well, reduce the operation period, prolong the normal production time of the oil well and realize the operation requirements of the oil-water well on rapidness, high efficiency and low cost.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (10)
1. The wax scraping cleaning tool for the continuous oil pipe is characterized by comprising a wax scraping structure, wherein the wax scraping structure comprises a shunting inner pipe, a positive spiral wax scraping part and a negative spiral wax scraping part are axially sleeved on the shunting inner pipe at intervals, inner spiral hydraulic rotating pipes are arranged inside the positive spiral wax scraping part and the negative spiral wax scraping part respectively, and the inner spiral hydraulic rotating pipes are used for driving the positive spiral wax scraping part and the negative spiral wax scraping part to rotationally scrape wax; a paraffin removal structure is arranged between the positive spiral paraffin scraping part and the negative spiral paraffin scraping part in a propping manner, and the paraffin removal structure is used for axial and radial jet flow cleaning; the bottom intercommunication of reposition of redundant personnel inner tube sets up the direction and washes the structure, the top intercommunication of reposition of redundant personnel inner tube sets up spacing seal structure.
2. The scraping and cleaning tool for a coiled tubing of claim 1, wherein a first shunting window is provided at a same axial position on a side wall of the shunting inner tube corresponding to the forward-spiral scraping portion, a second shunting window is provided at a same axial position on a side wall of the shunting inner tube corresponding to the reverse-spiral scraping portion, outer cylinder windows are provided at lower portions of outer walls of the forward-spiral scraping portion and the reverse-spiral scraping portion, an inner cavity of the shunting inner tube forms a liquid inner flow passage, a first shunting window, an inner cavity of the forward-spiral scraping portion, and an outer cylinder window on the forward-spiral scraping portion form a first liquid outer flow passage, and a second shunting window, an inner cavity of the reverse-spiral scraping portion, and an outer cylinder window on the reverse-spiral scraping portion form a second liquid outer flow passage.
3. The wax scraping and cleaning tool for the coiled tubing of claim 2, wherein the positive spiral wax scraping part comprises a first outer barrel which is radially and alternately sleeved outside the shunting inner pipe, the top and the bottom of the first outer barrel are hermetically sleeved on the shunting inner pipe, a positive spiral wax scraping sheet is arranged on the outer wall of the first outer barrel, a first shunting window is arranged on the side wall of the shunting inner pipe at a position opposite to the upper part of the first outer barrel, the outer barrel window is arranged on the lower part of the side wall of the first outer barrel, and the inner spiral hydraulic rotating pipe is arranged on the inner wall of the first outer barrel above the outer barrel window; the top of the first outer barrel is connected with the limiting sealing structure in a sealing and rotating mode through a first rotary sealer, and the bottom of the first outer barrel is connected with the paraffin removal structure in a sealing and rotating mode through a second rotary sealer.
4. The wax scraping and cleaning tool for the coiled tubing of claim 3, wherein the inverse spiral wax scraping part comprises a second outer barrel which is radially and alternately sleeved outside the diversion inner pipe, the top and the bottom of the second outer barrel are hermetically sleeved on the diversion inner pipe, an inverse spiral wax scraping sheet is arranged on the outer wall of the second outer barrel, a second diversion window is arranged on the side wall of the diversion inner pipe at a position opposite to the upper part of the second outer barrel, the outer barrel window is arranged on the lower part of the side wall of the second outer barrel, and the inner spiral hydraulic rotating pipe is arranged on the inner wall of the second outer barrel above the outer barrel window; the top of the second outer barrel is connected with the paraffin removal structure in a sealing and rotating mode through a third rotary sealer, and the bottom of the second outer barrel is connected with the guide flushing structure in a sealing and rotating mode through a fourth rotary sealer.
5. The paraffin scraping and cleaning tool for the coiled tubing as claimed in claim 4, wherein 3 positive-spiral paraffin scraping plates are arranged on the outer wall of the first outer cylinder, and the spiral interval between two adjacent positive-spiral paraffin scraping plates is 120 degrees; the outer wall of the second outer barrel is provided with 3 reverse-spiral wax scraping sheets, and the spiral interval between every two adjacent reverse-spiral wax scraping sheets is 120 degrees.
6. The paraffin scraping and cleaning tool for the continuous oil pipe as claimed in claim 2, wherein the paraffin removing structure comprises a jet pipe provided with jet through holes on a side wall, the jet pipe is connected in series between the positive spiral paraffin scraping part and the negative spiral paraffin scraping part, an axial jet nozzle and a radial jet nozzle are arranged on an outer wall of the jet pipe, and a centering part is coaxially sleeved at the bottom of the jet pipe.
7. The wax scraping cleaning tool for coiled tubing of claim 2, wherein the guiding flushing structure comprises a guiding head with a sealed bottom, and a guiding flushing nozzle is arranged on the side wall of the guiding head.
8. The wax scraping and cleaning tool for the coiled tubing of claim 7, wherein the bottom end of the guiding head is arranged in a conical surface with a diameter gradually reduced from top to bottom.
9. The paraffin scraping and cleaning tool for the coiled tubing as claimed in claim 2, wherein the limiting sealing structure comprises a limiting sealing sleeve which is sleeved on the top of the shunt inner tube, the limiting sealing sleeve is used for axially limiting the inner spiral hydraulic rotating tube in the positive spiral paraffin scraping part, and the top end of the limiting sealing sleeve is connected with a safety connector.
10. A method of using the tool for cleaning a wax scraper for a coiled tubing according to any one of claims 1 to 9, comprising the steps of:
step a, connecting the continuous oil pipe with the oil pipe by using a wax scraping and cleaning tool;
b, preparing liquid for wax scraping and cleaning;
c, putting the coiled tubing into the well by using a wax scraping and cleaning tool;
d, preheating a wellhead;
e, pressurizing injection liquid to start wax scraping and cleaning work; a part of liquid impacts the inner spiral hydraulic rotating pipe to drive the inner spiral hydraulic rotating pipe to rotate, and the inner spiral hydraulic rotating pipe rotates and drives the positive spiral wax scraping part and the reverse spiral wax scraping part to rotate and scrape wax; a part of liquid is sprayed axially and radially through the paraffin removal structure to clean the pipe wall;
and f, scraping wax and cleaning to a target well section, performing hot washing for a circle, lifting the pipe column, and taking out the continuous oil pipe and the well repairing tool after the well repairing operation is finished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910874177.7A CN112523726B (en) | 2019-09-17 | 2019-09-17 | Wax scraping and cleaning tool for continuous oil pipe and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910874177.7A CN112523726B (en) | 2019-09-17 | 2019-09-17 | Wax scraping and cleaning tool for continuous oil pipe and using method thereof |
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| CN112523726A true CN112523726A (en) | 2021-03-19 |
| CN112523726B CN112523726B (en) | 2022-12-02 |
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Cited By (1)
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| CN114635668A (en) * | 2022-02-22 | 2022-06-17 | 中石化石油工程技术服务有限公司 | Tool and method for safely punching and scraping oil pipe |
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| CN112523726B (en) | 2022-12-02 |
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