CN106761561B - Wax removal and scale removal process for coiled tubing of oil and gas field - Google Patents
Wax removal and scale removal process for coiled tubing of oil and gas field Download PDFInfo
- Publication number
- CN106761561B CN106761561B CN201710017022.2A CN201710017022A CN106761561B CN 106761561 B CN106761561 B CN 106761561B CN 201710017022 A CN201710017022 A CN 201710017022A CN 106761561 B CN106761561 B CN 106761561B
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- pipe string
- paraffin
- tool
- oil
- coiled tubing
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000012188 paraffin wax Substances 0.000 claims abstract description 55
- 238000007790 scraping Methods 0.000 claims abstract description 33
- 239000001993 wax Substances 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 15
- 238000011010 flushing procedure Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cleaning In General (AREA)
Abstract
The invention relates to a paraffin removal and scale removal process for coiled tubing of an oil-gas field, which utilizes the coiled tubing to remove paraffin, and the removed paraffin can be circulated to the ground without causing the blockage of a shaft artificially. The upper end of the flushing tool is provided with a flushing hole which can clean the residual wax at the mechanical scraping position. The continuous oil pipe is connected with the paraffin removal descaling tool to remove paraffin and scale, the front end flushing tool of the pipe string can firstly conduct 360-degree hydraulic cleaning on the shaft, and as the pipe string is put in, the paraffin remover in the pipe string mechanically cleans the shaft again, so that a dual cleaning mode of combining hydraulic flushing and mechanical scraping is achieved, the cleaning effect is greatly improved, the cost is saved, and the working efficiency is improved.
Description
Technical Field
The invention relates to a paraffin removal and scale removal process for a coiled tubing of an oil-gas field.
Background
After the development of the oil and gas well, the production flow is entered. Because the produced oleaginous compounds contain various materials, the pressure and temperature change continuously as they flow from the subsurface to the surface. As a result of this change, waxes in the oleaginous compounds continue to precipitate. The precipitated wax adheres to the well wall, and the wax becomes thicker and thicker along with the increase of the production time. Waxy materials adhered in the well wall can reduce the oil production channel, block the bottom oil production channel, and greatly reduce the yield of an oil and gas well.
At present, the main paraffin removal and scale removal processes at home and abroad can be divided into four types, namely hot oil circulation cleaning, mechanical cleaning, chemical agent cleaning and bacterial biological inhibition. The first three modes have limited cleaning effect, especially for the case of thicker wax deposition. The fourth method has a good cleaning effect, but is expensive, is greatly influenced by environmental factors, and is not easy to implement.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a paraffin removal and descaling process for an oil-gas field coiled tubing, which uses a coiled tubing to connect a paraffin removal and descaling tool to remove paraffin and scale, a flushing tool at the front end of a string can firstly carry out 360-degree hydraulic cleaning on a shaft, and a paraffin remover in the string mechanically cleans the shaft along with the descending of the string, so that a double cleaning mode combining hydraulic flushing and mechanical scraping is realized, the cleaning effect is greatly improved, the cost is saved, the working efficiency is improved, and the problems existing in the prior art are effectively solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the paraffin removal and scale removal process for the coiled tubing of the oil and gas field comprises the following operation steps:
a. preparing a standard adapter, a motor head assembly, a vibration tool and a weighting rod;
b. installing the coiled tubing at the end of the coiled tubing with a prepared standard crossover sub;
c. connecting the prepared standard motor head assembly, the vibration tool and the weighting rod conventional tool to the conversion joint;
d. assembling the tool string and connecting the tool string to the tail end of the small continuous oil pipe;
e. the tool pipe is connected into a well in series, a pump is started, and operation is carried out according to the displacement which is designed in advance; at the moment, firstly, the washing tool cleans sundries, and then the wax remover mechanically scrapes the left wax;
f. when a certain distance is needed to be placed in the operation process, lifting the pipe string, and observing whether the pipe string is blocked; during the operation, the reverse drainage of the wellhead is required to be continuously observed, and once the reverse drainage liquid is free from sundries such as wax and the like, the pipe string is lifted up immediately;
g. after the well is cleared to the designed position, the pump is not stopped, and the pipe string is lifted up by the displacement until the pipe string is lifted to the wellhead.
The tool pipe string in the step d is a split tool pipe string, and comprises a pipe string body, a plurality of trapezoidal centralizing blocks are arranged on the upper portion of the pipe string body along the circumferential direction of the pipe string body at intervals, a plurality of supporting blocks are arranged on the pipe string body below the centralizing blocks along the length direction of the pipe string body in a spacing mode, an arc wax scraping sheet is sleeved outside each supporting block, a rotary shell is sleeved below the supporting block far away from the centralizing blocks, bearings are respectively arranged on concave tables at two ends of a shell of the rotary shell, a mandrel is arranged on the pipe string body below the rotary shell, and a plurality of nozzles are respectively arranged on the outer side wall of the rotary shell and the front end of the mandrel.
The included angle of the circular arc-shaped paraffin scraping sheet is larger than or equal to 360 degrees.
The lower end part of the split paraffin scraping sheet is provided with a sharp angle, the angle of the sharp angle is 15-30 degrees, the upper end part of the split paraffin scraping sheet is provided with a sharp angle, and the angle of the sharp angle is 15-30 degrees.
The tool pipe string in the step d is a spiral tool pipe string and comprises a pipe string body, a plurality of trapezoid centralizing blocks are arranged on the upper portion of the pipe string body at intervals along the circumferential direction of the pipe string body, a plurality of supporting blocks are arranged on the pipe string body below the centralizing blocks at intervals along the circumferential direction of the pipe string body, a spiral paraffin scraping sheet sequentially penetrates through the upper portion of each supporting block and covers the outer surface of each supporting block, a rotary shell is sleeved below the supporting block far away from the centralizing blocks, bearings are respectively arranged on concave tables at two ends of the rotary shell, a mandrel is arranged on the pipe string body below the rotary shell, and a plurality of nozzles are respectively arranged on the outer side wall of the rotary shell and the front end of the mandrel.
The total angle of the spiral paraffin scraper is equal to or greater than 360 degrees.
The lower end part of the spiral paraffin scraping sheet is provided with a sharp angle, the angle of the sharp angle is 15-30 degrees, the upper end part of the spiral paraffin scraping sheet is provided with a sharp angle, and the angle of the sharp angle is 15-30 degrees.
The nozzles arranged on the rotary shell are obliquely arranged upwards, and the angle between the nozzles and the axis of the pipe string body is 5-15 degrees.
The number of the trapezoid centralizing blocks is 3-6, the bottom edges of the trapezoid centralizing blocks are arranged on the pipe string body, and the angles of two bottom feet of the trapezoid centralizing blocks are 30-60 degrees.
The paraffin removal and descaling process for the continuous oil pipe of the oil and gas field has the beneficial effects that: wax is removed by using the coiled tubing, and the removed wax can be circulated to the ground, so that the well bore is not blocked artificially. The upper end of the flushing tool is provided with a flushing hole which can clean the residual wax at the mechanical scraping position. The continuous oil pipe is connected with the paraffin removal descaling tool to remove paraffin and scale, the front end flushing tool of the pipe string can firstly conduct 360-degree hydraulic cleaning on the shaft, and as the pipe string is put in, the paraffin remover in the pipe string mechanically cleans the shaft again, so that a dual cleaning mode of combining hydraulic flushing and mechanical scraping is achieved, the cleaning effect is greatly improved, the cost is saved, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a split type tool string for a paraffin removal and descaling process of an oil and gas field coiled tubing.
Fig. 2 is a schematic structural diagram of a string of spiral tools for a paraffin removal and descaling process for coiled tubing of an oil and gas field.
In the figure: 1. the pipe string comprises a pipe string body, 2, a centralizing block, 3, a supporting block, 4, an arc-shaped paraffin scraping sheet, 5, a rotary shell, 6, a mandrel, 7, a nozzle, 8, a bearing, 9 and a spiral paraffin scraping sheet.
Detailed Description
In order to clearly illustrate the features of the present invention, the present invention will be further described with reference to the following detailed description and the accompanying drawings.
Examples
As shown in fig. 1: the paraffin removal and scale removal process for the coiled tubing of the oil and gas field comprises the following operation steps:
a. preparing a standard adapter, a motor head assembly, a vibration tool and a weighting rod;
b. installing the coiled tubing at the end of the coiled tubing with a prepared standard crossover sub;
c. connecting the prepared standard motor head assembly, the vibration tool and the weighting rod conventional tool to the conversion joint;
d. assembling the tool string and connecting the tool string to the tail end of the small continuous oil pipe;
e. the tool pipe is connected into a well in series, a pump is started, and operation is carried out according to the displacement which is designed in advance; at the moment, firstly, the washing tool cleans sundries, and then the wax remover mechanically scrapes the left wax;
f. when a certain distance is needed to be placed in the operation process, lifting the pipe string, and observing whether the pipe string is blocked; during the operation, the reverse drainage of the wellhead is required to be continuously observed, and once the reverse drainage liquid is free from sundries such as wax and the like, the pipe string is lifted up immediately;
g. after the well is cleared to the designed position, the pump is not stopped, and the pipe string is lifted up by the displacement until the pipe string is lifted to the wellhead.
The tool pipe string in the step d is a split type tool pipe string, and comprises a pipe string body 1, a plurality of trapezoid righting blocks 2 are arranged on the upper portion of the pipe string body 1 along the circumferential direction of the pipe string body 1 at intervals, a plurality of supporting blocks 3 are arranged on the pipe string body 1 below the righting blocks 2 along the length direction of the pipe string body 1 in a spacing mode, an arc-shaped paraffin scraping sheet 4 is sleeved outside each supporting block 3, a rotary shell 5 is sleeved below the supporting block 3 far away from the righting blocks 2, bearings 8 are respectively arranged on concave tables at two ends of a shell of the rotary shell 5, a mandrel 6 is arranged on the pipe string body 1 below the rotary shell 5, and a plurality of nozzles 7 are respectively arranged on the outer side wall of the rotary shell 5 and the front end of the mandrel 6.
The included angle of the circular arc-shaped paraffin scraping sheet 4 is larger than or equal to 360 degrees. The wax scraping sheet angle is more than or equal to 360 degrees, so that no residue exists on the whole circumference in the shaft.
The lower end part of the split paraffin scraping sheet is provided with a sharp angle, the angle of the sharp angle is 15-30 degrees, the upper end part of the split paraffin scraping sheet is provided with a sharp angle, and the angle of the sharp angle is 15-30 degrees. The sharp angle is designed, and the angle of the sharp angle is 15 degrees to 30 degrees, so that the resistance of the pipe string in-going can be reduced, and the condensed wax and sundries in the shaft can be scraped more conveniently.
The nozzle 7 arranged on the rotary shell is obliquely arranged upwards, and the angle between the nozzle 7 and the axis of the pipe string body 1 is 5-15 degrees. The nozzle 7 can wash up the wax and sundries which are scraped off but still remain in the wax scraping sheet, and keep the wax and sundries clean, so that the drop-in resistance of the pipe string is reduced.
The number of the trapezoid centralizing blocks 2 is 3-6, the bottom edges of the trapezoid centralizing blocks 2 are arranged on the pipe string body 1, and the angles of two bottom feet of the trapezoid centralizing blocks 2 are 30-60 degrees. When the pipe string passes through the wellhead manifold, the paraffin scraping sheet is prevented from being clamped at the reducing position, and the paraffin scraping sheet is prevented from being severely deformed by the extrusion of the well wall in the process of being put down.
In the operation process, the tail end of the continuous oil pipe is connected with an adapter and is converted into a connecting thread. Conventional tools such as a motor head assembly, a vibration tool and the like which are matched with each other can be connected between the adapter and the tool pipe string. And finally connecting the tool pipe string. And (5) lowering the connecting oil pipe according to a conventional procedure. The wax remover part above the pipe string body 1 mechanically scrapes sundries such as wax accumulated on a shaft in the process of entering, the flushing tool part below the pipe string body 1 can rotate at a high speed under a certain displacement, the rotating shell of the flushing tool part can drive the nozzle 7 to rotate, the inner side wall of the shaft is cleaned by 360 degrees, and the cleaning is ensured to be free from leaving sundries.
Examples
As shown in figure 2, the tool pipe string in the step d is a spiral tool pipe string, and comprises a pipe string body 1, a plurality of trapezoid righting blocks 2 are arranged at intervals on the upper part of the pipe string body 1 along the circumferential direction of the pipe string body 1, a plurality of supporting blocks 3 are arranged on the pipe string body 1 below the righting blocks 2 at intervals along the circumferential direction of the pipe string body 1 in a spiral manner, a spiral paraffin scraping sheet 9 sequentially penetrates through the upper part of each supporting block 3 and covers the outer surface of each supporting block 3, a rotary shell 5 is sleeved below the supporting blocks 3 far away from the righting blocks 2, bearings 8 are respectively arranged on concave tables at two ends of a shell of the rotary shell 5, a mandrel 6 is arranged on the pipe string body 1 below the rotary shell 5, and a plurality of nozzles 7 are respectively arranged on the outer side wall of the rotary shell 5 and the front end of the mandrel 6.
The total angle of the spiral paraffin blade 9 is equal to or greater than 360 °. The paraffin scraping sheet angle is more than or equal to 360 degrees, so that no residue exists on the whole circumference in the shaft.
The lower end part of the spiral paraffin scraping sheet 9 is provided with a sharp angle, the angle of the sharp angle is 15-30 degrees, the upper end part of the spiral paraffin scraping sheet 9 is provided with a sharp angle, and the angle of the sharp angle is 15-30 degrees. The sharp angle is designed, and the angle of the sharp angle is 15 degrees to 30 degrees, so that the resistance of the pipe string in-going can be reduced, and the condensed wax and sundries in the shaft can be scraped more conveniently.
Otherwise, the same as in example 1 was conducted.
The above embodiments are not to be taken as limiting the scope of the invention, and any alternatives or modifications to the embodiments of the invention will be apparent to those skilled in the art and fall within the scope of the invention.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (7)
1. A paraffin removal and scale removal process for a continuous oil pipe of an oil and gas field is characterized by comprising the following steps of: the method comprises the following operation steps:
a. preparing a standard adapter, a motor head assembly, a vibration tool and a weighting rod;
b. installing the coiled tubing at the end of the coiled tubing with a prepared standard crossover sub;
c. connecting the prepared standard motor head assembly, the vibration tool and the weighting rod conventional tool to the conversion joint;
d. assembling the tool string and connecting the tool string to the tail end of the continuous oil pipe;
the tool pipe string is a split type tool pipe string and comprises a pipe string body, wherein a plurality of trapezoid righting blocks are arranged at the upper part of the pipe string body along the circumferential direction of the pipe string body at intervals, a plurality of supporting blocks are arranged on the pipe string body below the righting blocks at intervals along the length direction of the pipe string body, an arc paraffin scraping sheet is sleeved outside each supporting block, a rotary shell is sleeved below the supporting block far away from the righting blocks, a bearing is respectively arranged on concave tables at the two ends of a shell of the rotary shell, a mandrel is arranged on the pipe string body below the rotary shell, and a plurality of nozzles are respectively arranged on the outer side wall of the rotary shell and the front end of the mandrel;
or the tool pipe string is a spiral tool pipe string, and comprises a pipe string body, wherein a plurality of trapezoid centralizing blocks are arranged at the upper part of the pipe string body at intervals along the circumferential direction of the pipe string body, a plurality of supporting blocks are arranged on the pipe string body below the centralizing blocks at intervals along the circumferential direction of the pipe string body, a spiral paraffin scraping sheet sequentially penetrates through the upper part of each supporting block and covers the outer surface of each supporting block, a rotary shell is sleeved below the supporting block far away from the centralizing block, bearings are respectively arranged on concave tables at the two ends of a shell of the rotary shell, a mandrel is arranged on the pipe string body below the rotary shell, and a plurality of nozzles are respectively arranged on the outer side wall of the rotary shell and the front end of the mandrel;
e. the tool pipe is connected into a well in series, a pump is started, and operation is carried out according to the displacement which is designed in advance; at the moment, firstly, the washing tool cleans sundries, and then the wax remover mechanically scrapes the left wax;
f. when a certain distance is needed to be placed in the operation process, lifting the pipe string, and observing whether the pipe string is blocked; during operation, the wellhead reverse drainage is required to be continuously observed, and once the reverse drainage liquid is free from waxy impurities, the pipe string is lifted immediately;
g. after the well is cleared to the designed position, the pump is not stopped, and the pipe string is lifted up by the displacement until the pipe string is lifted to the wellhead.
2. The oil and gas field coiled tubing paraffin removal and descaling process according to claim 1, wherein: the included angle of the circular arc-shaped paraffin scraping sheet in the step d is larger than or equal to 360 degrees.
3. The process for paraffin removal and descaling of coiled tubing of an oil and gas field according to claim 1, wherein the process comprises the following steps of: the lower end part of the circular arc paraffin scraping sheet in the step d is provided with a sharp angle, the angle of the sharp angle is 15-30 degrees, the upper end part of the circular arc paraffin scraping sheet is provided with a sharp angle, and the angle of the sharp angle is 15-30 degrees.
4. The process for paraffin removal and descaling of coiled tubing of an oil and gas field according to claim 1, wherein the process comprises the following steps of: the total angle of the spiral paraffin scraper in the step d is equal to or greater than 360 degrees.
5. The process for paraffin removal and descaling of coiled tubing of an oil and gas field according to claim 1, wherein the process comprises the following steps of: the lower end part of the spiral paraffin scraping sheet in the step d is provided with a sharp angle, the angle of the sharp angle is 15-30 degrees, the upper end part of the spiral paraffin scraping sheet is provided with a sharp angle, and the angle of the sharp angle is 15-30 degrees.
6. The process for paraffin removal and descaling of coiled tubing of an oil and gas field according to claim 1, wherein the process comprises the following steps of: the nozzle arranged on the rotary shell in the step d is obliquely arranged upwards, and the angle between the nozzle and the axis of the pipe string body is 5-15 degrees.
7. The process for paraffin removal and descaling of coiled tubing of an oil and gas field according to claim 1, wherein the process comprises the following steps of: the number of the trapezoid centralizing blocks in the step d is 3-6, the bottom edges of the trapezoid centralizing blocks are arranged on the pipe string body, and the angles of two bottom feet of the trapezoid centralizing blocks are 30-60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710017022.2A CN106761561B (en) | 2017-01-11 | 2017-01-11 | Wax removal and scale removal process for coiled tubing of oil and gas field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710017022.2A CN106761561B (en) | 2017-01-11 | 2017-01-11 | Wax removal and scale removal process for coiled tubing of oil and gas field |
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| Publication Number | Publication Date |
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| CN106761561A CN106761561A (en) | 2017-05-31 |
| CN106761561B true CN106761561B (en) | 2024-03-01 |
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| CN201710017022.2A Active CN106761561B (en) | 2017-01-11 | 2017-01-11 | Wax removal and scale removal process for coiled tubing of oil and gas field |
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| US7296627B2 (en) * | 2005-03-29 | 2007-11-20 | Dyer Richard J | Method for simultaneous removal of asphaltene, and/or paraffin and scale from producing oil wells |
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| CN203321443U (en) * | 2013-07-10 | 2013-12-04 | 任丘市荣昌石油机械设备制造有限公司 | Novel anti-disengaging screwed connection wax removal device |
| CN203547666U (en) * | 2013-11-06 | 2014-04-16 | 中国石油天然气集团公司 | Spiral multi-hole oblique-eye wax scraping device for an oil pipe |
| CN204552691U (en) * | 2015-04-29 | 2015-08-12 | 新疆罡拓能源科技有限公司 | A kind of paraffin cleaner of the reducing for oil field wax removal operation |
| CN205172451U (en) * | 2015-11-23 | 2016-04-20 | 濮阳市启华石油机械有限公司 | It scrapes wax and rights sucker rod to spout nickel spiral |
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| CN106761561A (en) | 2017-05-31 |
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