CN110593815A - High-salinity gas well underground descaling tool and descaling method - Google Patents
High-salinity gas well underground descaling tool and descaling method Download PDFInfo
- Publication number
- CN110593815A CN110593815A CN201910864829.9A CN201910864829A CN110593815A CN 110593815 A CN110593815 A CN 110593815A CN 201910864829 A CN201910864829 A CN 201910864829A CN 110593815 A CN110593815 A CN 110593815A
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- gas well
- oil pipe
- descaling
- scale
- wire brush
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- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007790 scraping Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000004140 cleaning Methods 0.000 claims abstract description 18
- 241001415288 Coccidae Species 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 230000001680 brushing effect Effects 0.000 claims description 23
- 238000010276 construction Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- WOIHABYNKOEWFG-UHFFFAOYSA-N [Sr].[Ba] Chemical compound [Sr].[Ba] WOIHABYNKOEWFG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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 discloses a high-salinity gas well underground descaling tool, which comprises: the dirty district is scraped before being provided with on the lateral wall of the anterior part of body, and preceding dirty district of scraping is provided with a plurality of doctor-bars, and the doctor-bar is the disc, sets up on the lateral wall at body middle part and brushes dirty district, brushes dirty district and evenly is provided with the wire brush in circumference. The invention also discloses a method for removing scale of the high-salinity gas well underground, which comprises the following steps: s001: a buffer is placed in advance in an oil pipe of a gas well; s002: putting the body into an oil pipe of a gas well, breaking hard scale on the inner wall of the oil pipe of the gas well through a scraping blade on the body, and removing soft scale on the inner wall of the oil pipe of the gas well through a steel wire brush; s003: when the steel wire brush is blocked, a sealing structure is formed between the steel wire brush and the inner wall of the oil pipe of the gas well, and the body moves upwards under the air pressure until the steel wire brush is pushed out of the oil pipe of the gas well; s004: after cleaning up the dirt on the body, lowering the body into the oil pipe of the gas well again; s005: and repeating the steps in the S002, S003 and S004 until the body cannot move upwards, and fishing out the oil pipe of the gas well from the body.
Description
Technical Field
The invention belongs to the field of oil and gas well scale removal, and particularly relates to a high-salinity gas well underground scale removal tool and a scale removal method.
Background
With the continuous development of gas fields, the scaling phenomenon of different degrees exists in part of gas well production strings, and scaling/corrosion commonly coexist. The corrosion product film and scale deposit on the inner wall of the oil pipe and mainly has the following hazards: 1. the friction resistance of the shaft is increased, so that the pressure drop of the shaft is increased, the productivity of the gas well is restricted, and the ultimate recovery ratio of the gas well is influenced; 2. galvanic couple and under-deposit corrosion can be generated, and the service life of the tubular column is reduced; 3. resulting in a reduced diameter wellbore and increased risk of sticking during downhole operations. The prior common methods for cleaning the scale of the shaft mainly comprise: chemical descaling, mechanical scraping, mechanical drilling and milling, hydraulic descaling and the like. Chemical descaling is corrosive to metals and is also substantially ineffective for barium-strontium scale and wells with large scale formation. The mechanical scraping and the mechanical drilling and milling descaling precision is difficult to control, the pipe wall is easy to damage, the blockage is easy to occur, and the construction period is long. The pure water jet flow descaling is not suitable for hard scale (carbonate and sulfate), and the scale removed is large, so that the blockage of the continuous oil pipe or a tool is caused. The traditional method for cleaning the scale of the shaft system cannot meet the scale cleaning requirement of a gas well shaft on a production field.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a highly mineralized gas well downhole descaling tool and descaling method that overcome, or at least partially solve or alleviate, the above-mentioned problems.
The invention provides a high-salinity gas well underground descaling tool, which comprises: the scraper comprises a body, the body is cylindrical, the front end of the body is provided with a conical head, a front dirt scraping area is arranged on the side wall of the front portion of the body, a plurality of scraping blades are arranged on the front dirt scraping area, the scraping blades are disc-shaped, a dirt brushing area is arranged on the side wall of the middle portion of the body, and steel wire brushes are uniformly arranged on the dirt brushing area in the circumferential direction.
The highly mineralized gas well downhole descaling tool of the invention also has the following optional features:
optionally, the diameter of the plurality of blades on the front scraping area gradually increases from front to back.
Optionally, a rear descaling area is arranged on the side wall of the rear part of the body, and the rear descaling area is provided with a plurality of scraping blades.
Optionally, the diameter of the plurality of blades on the rear scraping area gradually increases from rear to front.
Optionally, the wiper blade is of integral construction with the body.
Optionally, the wire brushes are distributed in multiple layers in the axial direction on the brushing area.
Optionally, the dirt brushing area is provided with an annular mounting groove, a dirt brushing piece is assembled in the mounting groove, and the steel wire brush is fixed on the dirt brushing piece.
Optionally, the cleaning member includes arc-shaped brush pieces, the wire brush is fixed on an outer side wall of each of the arc-shaped brush pieces, and the arc-shaped brush pieces are enclosed into a cylindrical shape in the mounting groove.
Optionally, the rear end of the body is provided with a fishing head, and the end face of the fishing head is provided with a reducing blind hole.
The invention also provides a method for removing scale of the high-salinity gas well underground, which comprises the following steps:
s001: a buffer is placed in advance in an oil pipe of a gas well;
s002: putting the body into an oil pipe of a gas well, enabling the body to freely fall in the oil pipe of the gas well under the action of self gravity, breaking hard scale on the inner wall of the oil pipe of the gas well through a scraping blade on the body, and removing soft scale on the inner wall of the oil pipe of the gas well through a steel wire brush;
s003: when the hard scale and the soft scale accumulated on the steel wire brush and the inner wall of the oil pipe gradually form a sealing structure, the body starts to move upwards under the air pressure in the oil pipe of the gas well until the body is pushed to the upper port of the oil pipe of the gas well, and once scale cleaning is finished;
s004: taking out the body, cleaning dirt on the body, and then lowering the body into the oil pipe of the gas well again;
s005: and repeating the steps in the steps S002, S003 and S004 until the body cannot be pushed to the upper port of the gas well oil pipe, fishing out the body from the gas well oil pipe, and finishing cleaning.
The invention has the beneficial effects that:
the invention relates to a high-salinity gas well downhole descaling tool and a descaling method, which are characterized in that a scraping blade and a steel wire brush on a body are used for removing hard scale and soft scale on the inner wall of a gas well oil pipe, then the steel wire brush is blocked by the hard scale and the soft scale to form a sealing structure with the inner wall of the oil pipe, and the body is pushed upwards to the upper port of the oil pipe under the pressure of gas in the gas well oil pipe. Along with clearance and input many times to the body, the dirt in the oil pipe is finally cleared up, and it can to fish out the body from oil pipe at last. The structure is simple, the use is convenient, the blocking is not easy to happen, and the device can be used in a production field.
Drawings
FIG. 1 is a schematic overall configuration of one embodiment of a hypersaline gas well downhole descaling tool of the present invention;
fig. 2 is a partial structural view of fig. 1.
In the above figures: 1. a body; 110. a front descaling area; 120. a dirt brushing area; 130. a rear scraping area; 2. a conical head; 3. scraping a blade; 4. a wire brush; 5. fishing the head; 501: and (4) necking blind holes.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
Example 1
Referring to fig. 1, the present invention provides a highly mineralized gas well downhole descaling tool, comprising: the body 1, the body 1 is cylindrical, and the front end of body 1 is provided with conical head 2, scrapes dirty district 110 before being provided with on the anterior lateral wall of body 1, and preceding dirty 110 district of scraping is provided with a plurality of doctor-bars 3, and doctor-bar 3 is the disc, sets up on the lateral wall at body 1 middle part and brushes dirty district 120, brushes dirty district 120 and upwards evenly is provided with the wire brush 4 in circumference.
The body 1 is made of solid steel columns, a plurality of scraping blades 3 are arranged in multiple layers in the body 1, when the body 1 falls in an oil pipe of a gas well, the scraping blades 3 can crush hard scale mainly comprising carbonate and sulfate, the steel wire brush 4 can remove soft scale such as scale blocks, corrosion product films and the like which are crushed and loosened by the scraping blades 3, the scale blocks and the soft scale can improve the sealing performance of the steel wire brush 4 after being sufficiently accumulated in the steel wire brush 4, a sealing structure is formed between the steel wire brush 4 and the inner wall of the oil pipe, gas generated in the oil pipe of the gas well can push the body 1 to move upwards along the oil pipe of the gas well until reaching the upper end port of the oil pipe of the gas well, at the moment, a worker can easily recover the body 1, after cleaning the hard scale between the scraping blades 3 on the body 1 and the hard scale and the soft scale in the steel wire brush 4, the body 1 is put down into the oil pipe of the gas well again, the, until the dirt in the oil pipe is removed. The distance range between the scraping blades 3 is 1mm-10mm, the large-distance scraping blades 3 are suitable for removing oil pipes with different scaling forms, the small-distance scraping blades 3 are suitable for removing oil pipes with large scale blocks, and the small-distance scraping blades 3 are suitable for removing oil pipes with small scale blocks.
Embodiment 2 on the basis of embodiment 1, the diameter of the plurality of blades 3 on the front wiping area 110 is gradually increased from front to back.
The preceding district 110 of scraping is mainly from last down scraping the hard scale in the in-process of body 1 whereabouts, makes the diameter of scraping the doctor-bar 3 in preceding district 110 of scraping increase gradually from the front to the back, and reducible every doctor-bar 3 is to scraping the face of getting of hard scale, makes each doctor-bar 3 can play the effect of cleaning the dirt simultaneously, scrapes the possibility that the doctor-bar 3 in the district 110 was blocked by the hard scale before reducing.
Example 3
On the basis of embodiment 1, referring to fig. 1 and 2, a rear dirt scraping area 130 is provided on a side wall of the rear portion of the body 1, and a plurality of blades 3 are provided on the rear dirt scraping area 130.
After the steel wire brush 4 on the body 1 is blocked by hard scale and soft scale, the scraping blade 3 in the rear scraping area 130 can clean the inner side wall of an oil pipe again in the process that the body 1 moves upwards along the oil pipe of the gas well under the gas pressure.
Example 4
On the basis of embodiment 3, the diameter of the plurality of blades 3 on the rear wiping area 130 gradually increases from the rear to the front.
The back is scraped the district 130 and is mainly scraped the hard dirt from up down at the in-process that body 1 rises, makes the diameter of scraping the doctor-bar 3 in the back district 130 of scraping increase gradually from back to front, and reducible every doctor-bar 3 scrapes the face of getting to the hard dirt, makes each doctor-bar 3 can play the effect of cleaning the dirt simultaneously, reduces the back and scrapes the possibility that the doctor-bar 3 in the district 130 is blocked by the hard dirt.
Example 5
On the basis of any one of the above embodiments, the wiper blade 3 and the body 1 are of an integral structure.
Cutting a plurality of ring channels on the lateral wall to body 1, can form doctor-bar 3 between per two ring channels, the doctor-bar 3 that is the integral type structure with body 1 can not appear not hard up and the problem that drops.
Example 6
On the basis of example 1, the wire brushes 4 are distributed in a plurality of layers in the axial direction over the brushing area 120, as shown in fig. 1.
The steel wire brushes 4 are arranged on the dirt brushing area 120 in a multilayer mode along the axial direction, so that the steel wire brushes 4 are easily blocked by hard dirt and soft dirt in the dirt scraping and brushing process, a sealing structure is formed between the steel wire brushes 4 and the inner side wall of an oil pipe of a gas well, the high-pressure gas in the oil pipe of the gas well can be used for pushing the body 1 to move upwards, and automatic recovery of the body 1 is achieved.
Example 7
On the basis of example 1, the brushing area 120 is provided with an annular mounting groove in which the brushing member is fitted, and the wire brush 4 is fixed to the brushing member.
The steel wire brush 4 is used as an easily worn part and is frequently required to be replaced, the steel wire brush 4 is fixed on a scale brushing part, an annular mounting groove is formed in a scale brushing area 120 of the body 1, then the scale brushing part is assembled in the annular mounting groove, after the steel wire brush 4 is worn, the worn scale brushing part of the steel wire brush 4 is only required to be taken down from the annular mounting groove, and then a new scale brushing part is replaced.
Example 8
On the basis of example 7, the brush member comprises arc-shaped brush pieces, and the wire brush 4 is fixed on the outer side wall of each arc-shaped brush piece, and the arc-shaped brush pieces are enclosed into a cylindrical shape in the mounting groove.
The scale brushing part consists of a plurality of arc-shaped brush pieces, a steel wire brush 4 is fixed on each arc-shaped brush piece, and after the arc-shaped brush pieces are installed in the installation grooves on the scale brushing area 120 of the body 1 through screws, the arc-shaped scale brushing pieces are enclosed into a cylinder.
Example 9
On the basis of embodiment 1, referring to fig. 1 and 2, the rear end of the body 1 is provided with a fishing head 5, and the end face of the fishing head 5 is provided with a reducing blind hole 501.
After dirt on the inner side wall of the gas well oil pipe is cleaned, the steel wire brush 4 on the body 1 cannot be blocked by hard dirt and soft dirt, so that gas in the gas well oil pipe flows through the gap of the steel wire brush 4, the body 1 cannot move upwards along the gas well oil pipe, the body 1 needs to be fished out from the gas well oil pipe by using a fishing tool, and the necking blind hole 501 on the fishing head 5 can be matched with the end part of the fishing tool, so that the body 1 is fished out from the gas well oil pipe.
Example 10
According to the method for removing the scale in the underground high-salinity gas well, before scale removal, a buffer is placed in advance in an oil pipe of the gas well, the buffer is commonly used in the existing oil and gas well, an elastic part is arranged at the upper part of the buffer, the buffer is fixed in the oil pipe of the gas well in advance and used for limiting the descending position of the body 1 in the oil pipe of the gas well, and when the scale in the oil pipe of the gas well is reduced, the buffer can prevent the body 1 from falling off the lower end of the oil pipe of the gas well.
After the conical head 2 of the body 1 is placed downwards into an oil pipe of a gas well, the body 1 freely falls down in the oil pipe of the gas well under the action of self gravity, hard scale on the inner wall of the oil pipe of the gas well is broken through the scraping blade 3 on the body 1 and the self speed, and meanwhile, soft scale on the inner wall of the oil pipe of the gas well is brushed away by the steel wire brush 4; when the hard scale and the soft scale accumulated on the steel wire brush 4 and the inner wall of the oil pipe of the gas well form a sealing structure gradually, and gas in the oil pipe of the gas well cannot pass through the steel wire brush 4, upward thrust on the steel wire brush 4 is formed, and finally the body 1 starts to move upwards under the pushing of the air pressure in the oil pipe of the gas well until the body is pushed to the upper port of the oil pipe, so that a scale cleaning process is formed; after the worker takes out the body 1 and cleans dirt on the body 1, the worker lowers the body 1 into the oil pipe of the gas well again; the body 1 can repeat the cleaning process, when the body 1 does not move upwards in the gas well oil pipe any more, the dirt in the gas well oil pipe is completely removed, and at the moment, the body 1 needs to be fished out of the gas well oil pipe again to finish cleaning.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (10)
1. A hypersalinity gas well downhole descaling tool, comprising: the multifunctional cleaning tool comprises a body (1), wherein the body (1) is cylindrical, a conical head (2) is arranged at the front end of the body (1), a front dirt scraping area (110) is arranged on the side wall of the front portion of the body (1), a plurality of scraping sheets (3) are arranged in the front dirt scraping area (110), the scraping sheets (3) are disc-shaped, a dirt brushing area (120) is arranged on the side wall of the middle portion of the body (1), and steel wire brushes (4) are uniformly arranged on the dirt brushing area (120) in the circumferential direction.
2. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the plurality of wiper blades (3) on the leading wiper zone (110) increase in diameter from front to back.
3. A hypersalinity gas well downhole descaling tool according to claim 1, characterized in that a rear descaling area (130) is provided on the side wall of the rear portion of the body (1), and a plurality of said wiper blades (3) are provided on the rear descaling area (130).
4. A highly mineralized gas well downhole descaling tool according to claim 3, wherein the plurality of wiper blades (3) on the rear wiping area (130) have a diameter that gradually increases from rear to front.
5. A highly mineralized gas well downhole descaling tool according to any one of claims 1 to 4, characterized in that the wiper blade (3) is of one-piece construction with the body (1).
6. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the wire brushes (4) are distributed in multiple layers in the axial direction over the descaling area (120).
7. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the descaling area (120) is provided with an annular mounting groove, a descaling element is assembled in the annular mounting groove, and the wire brush (4) is fixed on the descaling element.
8. A highly mineralized gas well downhole descaling tool according to claim 7, wherein the wiper comprises arc-shaped wiper blades, and the wire brush (4) is fixed on the outer side wall of each arc-shaped wiper blade, and the arc-shaped wiper blades surround a cylinder in the mounting groove.
9. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the rear end of the body (1) is provided with a fishing head (5), and the end face of the fishing head (5) is provided with a blind necking hole (501).
10. A method of descaling a highly mineralized gas well downhole using the highly mineralized gas well downhole descaling tool according to any one of claims 1 to 9, comprising the steps of:
s001: a buffer is placed in advance in an oil pipe of a gas well;
s002: putting the body into an oil pipe of a gas well, enabling the body to freely fall in the oil pipe of the gas well under the action of self gravity, breaking hard scale on the inner wall of the oil pipe of the gas well through a scraping blade on the body, and removing soft scale on the inner wall of the oil pipe of the gas well through a steel wire brush;
s003: when the hard scale and the soft scale accumulated on the steel wire brush and the inner wall of the gas well oil pipe gradually form a sealing structure, the body starts to move upwards under the air pressure in the gas well oil pipe until the body is pushed to the upper port of the gas well oil pipe, and once scale cleaning is finished;
s004: taking out the body, cleaning dirt on the body, and then lowering the body into the oil pipe of the gas well again;
s005: and repeating the steps in the S002, S003 and S004 until the body cannot move upwards, fishing out the oil pipe of the gas well from the body, and finishing cleaning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910864829.9A CN110593815B (en) | 2019-09-12 | 2019-09-12 | High-salinity gas well underground descaling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910864829.9A CN110593815B (en) | 2019-09-12 | 2019-09-12 | High-salinity gas well underground descaling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110593815A true CN110593815A (en) | 2019-12-20 |
| CN110593815B CN110593815B (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910864829.9A Active CN110593815B (en) | 2019-09-12 | 2019-09-12 | High-salinity gas well underground descaling method |
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| CN (1) | CN110593815B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111101898A (en) * | 2020-01-07 | 2020-05-05 | 中石化石油工程技术服务有限公司 | Sulphur device is scraped in steel wire operation of ultra-deep high sulphur gas well test-well |
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| CN207686676U (en) * | 2017-12-15 | 2018-08-03 | 中国石油天然气股份有限公司 | Gas lift plunger |
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2019
- 2019-09-12 CN CN201910864829.9A patent/CN110593815B/en active Active
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|---|---|---|---|---|
| US20030000704A1 (en) * | 1999-06-10 | 2003-01-02 | Reynolds J. Scott | Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| US20080245523A1 (en) * | 2007-03-07 | 2008-10-09 | Rotary Drilling Supplies Limited | Cleaning apparatus |
| CN103899279A (en) * | 2014-03-27 | 2014-07-02 | 西南石油大学 | Novel plunger applicable to sand-producing fluid-producing gas well plunger lifting techniques |
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| Publication number | Publication date |
|---|---|
| CN110593815B (en) | 2022-06-03 |
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