CN112664154A - Filter and oil well blockage removing method based on filter - Google Patents
Filter and oil well blockage removing method based on filter Download PDFInfo
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- CN112664154A CN112664154A CN202011596338.XA CN202011596338A CN112664154A CN 112664154 A CN112664154 A CN 112664154A CN 202011596338 A CN202011596338 A CN 202011596338A CN 112664154 A CN112664154 A CN 112664154A
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Abstract
The invention discloses a filter and an oil well blockage removing method based on the filter, and solves the problem that settled sand is not easy to clean up when an oil well is blocked. The method comprises the steps of firstly analyzing the components of the polymer plug, selecting a blocking remover to block an oil well, then pouring hot water to soak the oil well, and finally cleaning sand at the bottom of the well by adopting a filter after the oil well is chemically blocked. The invention has the advantages of thorough blockage removal, cleaner oil well after blockage removal, reutilization as a water injection well, less energy consumption and the like.
Description
Technical Field
The invention relates to the technical field of petroleum production, in particular to a filter and an oil well blockage removing method based on the filter.
Background
Petroleum is used as an important non-renewable chemical energy source, has important influence on national economy and national safety, primary oil recovery is called by exploiting by means of natural energy consumption (the recovery ratio is 5% -10%), secondary oil recovery is called by maintaining the pressure of an oil layer (the recovery ratio is 30% -40%) by means of artificial water (gas) injection, however, as the oil field enters the later development stage of high water content, the residual recoverable reserve is less and less, the oil yield is reduced more and more seriously, a new tertiary oil recovery method is an important measure for improving the recoverable reserve, but the problem brought about is that the oil well is easy to block, moreover, the sand production of the oil well becomes more serious when each large oil field in China enters the middle and later development stages in succession, although the traditional chemical blocking remover blocking removal oil well solves the problem of polymer blocking, the new blocking removal problem is brought because only the blocking remover is used for blocking removal: 1. 2, the blockage contains sand, and after chemical blockage removal, the sand at the bottom of the well is increased; moreover, some oil wells are recycled after being used up as water injection wells, so the method for removing the blockage of the oil well is still to be improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a filter for solving the problems and a method for removing the blockage of the oil well based on the filter.
The invention is realized by the following technical scheme:
the utility model provides a filter for clear up oil well bottom deposit at oil well unblock in-process, includes motor, stirring rake and cartridge filter under water, cartridge filter one end is sealed, and the motor is installed on the outer wall of cartridge filter closed end under water, and the motor is connected with stirring rake one end under water, and the stirring rake is located the cartridge filter, the stirring rake shaft body is Archimedes hob, and the propeller is connected to the one end that the motor was kept away from under water to the stirring rake, and the propeller is opposite with Archimedes hob spiral direction, the cartridge filter inner wall is equipped with filter equipment, and filter equipment is used for filtering and collects the sand setting in the pit.
In this scheme, the setting of screw makes the water of filter below drive down to the shaft bottom sand setting and assaults for the sand setting "floats" in aqueous passively, and water upward movement under the drive of Archimedes hob, and simultaneously, because the effect of centrifugal force, the aquatic sand setting moves again to the filter equipment on the cartridge filter inner wall, and at this moment, the water in the cartridge filter moves outside the section of thick bamboo through the filter cylinder wall, and the aquatic sand setting then stops on filter equipment after filter equipment filters, and the contrary understanding of turning to among the above-mentioned: a plane is taken along one radial direction of the stirring paddle, and the inclined direction of the propeller on the plane is opposite to the inclined direction of the spiral blade of the Archimedes spiral rod.
Preferably, a mesh cylinder is sleeved outside the stirring paddle, one end of the mesh cylinder is closed, and the other end of the mesh cylinder is connected with the inner wall of the filter cylinder; the stirring paddle is protected, and the gravel is prevented from impacting the stirring paddle to damage the stirring paddle.
Further, the diameter of the mesh hole of the mesh cylinder is less than 4 mm; damage to the paddles originates primarily from gravel at the bottom of the well, with the smallest diameter gravel being about 4mm in diameter.
Preferably, the filtering device is an Archimedes spiral filtering plate, the filtering plate is connected with the inner wall of the filtering cylinder, and the middle part of the surface of the filtering plate is concave; the setting of filter face indent makes the filter have the grit and collects the function.
Preferably, a filter residue collecting barrel is connected to the surface of the filter plate, which is far away from the underwater motor, and is coaxial with the stirring paddle, the shape of the barrel opening of the filter residue collecting barrel is matched with the surface of the filter plate, and a notch corresponding to the barrel opening is formed in the filter plate; so that part of the sand and stone is not carried away from the filtering device again by water flow after entering the filter residue collecting barrel.
An oil well blockage removing method, which applies the filter to carry out shaft bottom cleaning in the blockage removing process, comprises the following steps:
s1, extracting a blockage, analyzing and identifying components of the blockage, and preferably selecting a blocking remover;
s2, washing the oil well by using clean water at 70 ℃ and discharging water out of the oil well;
s3, putting the blocking remover selected in the step S1 into the oil well at one time, introducing hot water with the temperature of 70 ℃, closing the oil well mouth and preserving the heat of the oil well mouth for 12 hours;
s4, lowering the filter to the bottom of the well and suspending, filling clear water to grind the filter, and starting the filter to filter and collect settled sand at the bottom of the well into the filter.
The existing oil well blockage removing method generally comprises the steps of improving a blockage removing agent, then carrying out chemical blockage removal on polymer blockage of an oil well and carrying out reverse circulation well washing, but in the long-term time process, after chemical blockage removal is adopted, gravel is easy to remain at the bottom of the oil well, when the times are too many, the actual depth of the oil well is reduced, if the gravel is accumulated to a certain thickness, blockage is easy to cause, and due to the adoption of reverse circulation well washing, the energy consumption is too large, the functions of certain remote areas cannot meet the requirements necessarily, so that when the oil well is blocked, not only the main polymer blockage needs to be removed, but also the removal of the gravel at the bottom of the oil well is particularly important.
According to the invention, before the blocking remover is added, clear water is used for washing to reduce sand and stone adsorbed on the inner surface of the oil well, and water is discharged simultaneously in the washing process to prevent the sand and stone from precipitating; after the polymer plug is decomposed, part of gravels contained in the polymer plug are sunk into the bottom of the well, and then the settled sands at the bottom of the well are cleaned through a filter, so that the bottom of the well is ensured to be clean. Compared with the existing blockage removing method, the spiral centrifugal filter is adopted for cleaning the bottom of the well, only the electric energy is consumed under the condition of effectively cleaning the settled sand at the bottom of the well, and the existing method generally adopts reverse circulation well cleaning, so that the energy consumption is large, the construction process is more complicated than that of the method, and the method is not easy to clean.
Preferably, the step S1 includes performing erosion experiments of different types of deblocking agents on the blockage, and the deblocking agents are preferably selected according to the average weight of erosion rate and erosion rate; the weights in this scheme can be understood as: and weighting and dividing the corrosion rate and the corrosion rate, sorting and scoring the corrosion rate or the corrosion rate of each blocking remover, and preferably selecting the highest final score which is the product of the score and the weight.
Preferably, the method further includes, after the step S1 and before the step S2, the step S11: pouring clear water into the bottom of the well, and discharging sludge at the bottom of the oil well by using a sludge pump; the sludge is prevented from blocking the propeller.
Preferably, the clean water level in step S2 is lower than the top surface of the filter.
The invention has the following advantages and beneficial effects:
1. in the oil well blockage removal process, the filter is used for cleaning the settled sand at the bottom of the oil well during well washing, so that the cleanliness of the oil well after blockage removal is improved, the accumulation of sand and stone at the bottom of the oil well is prevented, and the blockage of the oil well caused by the accumulation of the settled sand of the oil well is avoided.
2. In the oil well blockage removal process, the filter is matched with clear water to wash the well, so that the energy consumption is reduced, namely, high-pressure gas is not required to be maintained to clean the bottom of the well, the engineering cost is reduced, and the resource requirement is reduced.
3. In the oil well blockage removal process, the filter is adopted to clean the well bottom, clear water in the filter moves upwards under the driving of the stirring paddle and then moves to the outside of the filter and enters the filter from the bottom of the filter to form circulation, and due to the fact that entropy in the sand settling system increases under the driving of the clear water, sand and stones move along with the clear water and are filtered by the filter, additional pressure is not needed, sand settling at the well bottom is prevented from being pressed, the sand settling can flow along with the clear water more easily, and the cleaning effect is better.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the filter of the present invention.
Reference numbers and corresponding part names in the drawings:
1-propeller, 2-screw rod, 3-filter plate, 4-filter residue collecting barrel, 5-underwater motor, 6-filter cartridge and 7-oil well.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
A filter is used for cleaning sediments at the bottom of an oil well 7 in the blockage removing process of the oil well 7 and comprises an underwater motor 5, a stirring paddle and a filter cylinder 6, wherein one end of the filter cylinder 6 is closed, the underwater motor 5 is installed on the outer wall of the closed end of the filter cylinder 6, the underwater motor 5 is connected with one end of the stirring paddle, the stirring paddle is positioned in the filter cylinder 6, a mesh cylinder is sleeved outside the stirring paddle, the mesh aperture of the mesh cylinder is smaller than 4mm, one end, far away from the motor, of the mesh cylinder is closed, the mesh cylinder is fixedly connected with the filter cylinder 6, the shaft of the stirring paddle is an Archimedes screw rod 2, one end, far away from the underwater motor 5, of the stirring paddle is connected with a propeller 1, the propeller 1 is opposite to the rotation direction of the Archimedes screw rod 2, a filtering device is arranged on the inner wall of the filter cylinder 6, the filtering device is an, the filter 3 is kept away from and is connected with filter residue collecting vessel 4 on the face of motor 5 under water, and filter residue collecting vessel 4 and stirring rake coaxial line, 4 bung hole shapes of filter residue collecting vessel and 3 face adaptations of filter open the breach that has and correspond with the bung hole on the filter 3.
During operation, under the drive of screw 1, the clear water strikes shaft bottom sand setting, thereby make sand setting float in the clear water, and hob 2 makes the inside water of filter rotatory upwards, the sand setting of aquatic is filtered by filter 3 on the inner wall under the effect of centrifugal force, in the filtering process, sand setting partly stops in filter 3 indent, partly directly gets into residue collecting vessel 4, partly have filter 3 indent drive backward flow to residue collecting vessel 4 through water, and the clear water moves outside the filter through the filter wall, the filter bottom reenters the filter and forms the circulation, when the clear water got into the filter in the bottom, sand setting under the filter wall was driven under the filter or floated in the water, thereby realize shaft bottom sand setting clearance.
Example 2
An oil well blockage removing method for performing bottom hole cleaning in a blockage removing process by using the filter in the embodiment 1 comprises the following steps:
s1, extracting a polymeric plug, analyzing and identifying components of the plug, performing an erosion experiment on the polymeric plug by adopting the existing blocking remover with high quality, and preferably selecting the blocking remover according to the erosion rate and the erosion rate of each blocking remover in the polymeric plug;
s2, washing the oil well 7, particularly polymer blockage parts, by using clean water at 70 ℃, properly increasing water pressure to improve washing strength, removing sand stones on the surface of a polymer blockage, discharging water out of the well during washing, and reducing the sediment of the sand stones at the bottom of the well;
s3, putting the blocking remover selected in the step S1 into the oil well 7 at one time, introducing hot water with the temperature of 70 ℃, closing the oil well mouth and preserving the heat of the oil well mouth for 12 hours;
s4, the filter is placed to the bottom of the well and suspended, the filter is spaced from the top surface of the sand setting layer at the bottom of the well, clear water is continuously filled until the clear water is close to the top surface of the filter, and the filter is started to filter and collect the sand setting at the bottom of the well into the filter.
Preferably, the method further includes, after the step S1 and before the step S2, the step S11: clear water is poured into the bottom of the well, and sludge at the bottom of the oil well 7 is discharged by a sludge pump; preventing the sludge from blocking the propeller 1.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A filter for cleaning sediment at the bottom of an oil well (7) in the process of unblocking the oil well (7) is characterized by comprising an underwater motor (5), a stirring paddle and a filter cylinder (6);
one end of the filter cylinder (6) is closed, the underwater motor (5) is installed on the outer wall of the closed end of the filter cylinder (6), the underwater motor (5) is connected with one end of the stirring paddle, and the stirring paddle is located in the filter cylinder (6);
the shaft body of the stirring paddle is an Archimedes screw rod (2), one end of the stirring paddle, which is far away from the underwater motor (5), is connected with the propeller (1), and the rotating directions of the propeller (1) and the Archimedes screw rod (2) are opposite;
and a filtering device is arranged on the inner wall of the filter cartridge (6) and is used for filtering and collecting underground settled sand.
2. A filter according to claim 1, characterised in that the stirring paddle is externally provided with a mesh cylinder, one end of the mesh cylinder is closed, and the other end of the mesh cylinder is connected with the inner wall of the filter cylinder (6).
3. A filter as claimed in claim 2, wherein the mesh openings are less than 4mm in diameter.
4. A filter according to claim 1, characterized in that the filter means is a filter plate (3) in the shape of an archimedean spiral, the filter plate (3) being connected to the inner wall of the filter cartridge (6), the middle of the surface of the filter plate (3) being concave.
5. A filter according to claim 4, characterized in that the surface of the filter plate (3) remote from the underwater motor (5) is connected with a residue collecting barrel (4), the residue collecting barrel (4) is coaxial with the stirring paddle, the shape of the opening of the residue collecting barrel (4) is matched with the surface of the filter plate (3), and the filter plate (3) is provided with a notch corresponding to the opening.
6. An oil well plug removal method, characterized in that the filter of any one of claims 1 to 5 is used for cleaning the bottom of a well during the plug removal process, and the method comprises the following steps:
s1, extracting a blockage, analyzing and identifying components of the blockage, and preferably selecting a blocking remover;
s2, flushing the oil well (7) by using clean water at 70 ℃ and discharging the water out of the well;
s3, putting the blocking remover optimized in the step S1 into the oil well (7) at one time, introducing hot water with the temperature of 70 ℃, closing the oil well mouth and preserving the heat of the oil well mouth for 12 hours;
s4, lowering the filter to the bottom of the well, suspending the filter in the air, filling clear water, and starting the filter to filter and collect settled sand at the bottom of the well into the filter.
7. An oil well plug removal method as claimed in claim 6, wherein said step S1 includes carrying out erosion test of plug by different types of plug removal agent, and optimizing the plug removal agent according to the average weight of erosion rate and erosion rate.
8. A method as claimed in claim 6, further comprising step S11, after step S1 and before step S2, of injecting clean water downhole, and discharging sludge downhole of the well (7) by using a sludge pump.
9. An oil well plug removal method as claimed in claim 6, wherein the clean water level in step S2 is lower than the top surface of the filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011596338.XA CN112664154A (en) | 2020-12-29 | 2020-12-29 | Filter and oil well blockage removing method based on filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011596338.XA CN112664154A (en) | 2020-12-29 | 2020-12-29 | Filter and oil well blockage removing method based on filter |
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| Publication Number | Publication Date |
|---|---|
| CN112664154A true CN112664154A (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011596338.XA Pending CN112664154A (en) | 2020-12-29 | 2020-12-29 | Filter and oil well blockage removing method based on filter |
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| CN (1) | CN112664154A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116335588A (en) * | 2023-05-30 | 2023-06-27 | 陕西德锐石油科技工程有限公司 | Foam acidolysis blocking remover for oil-water well in oil field |
| RU2811215C1 (en) * | 2023-06-22 | 2024-01-11 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Downhole pumping unit with cleanable filter |
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| CN103127772A (en) * | 2013-03-05 | 2013-06-05 | 中国海洋石油总公司 | Device and method for eliminating sand of crude oil of laboratory |
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| CN116335588A (en) * | 2023-05-30 | 2023-06-27 | 陕西德锐石油科技工程有限公司 | Foam acidolysis blocking remover for oil-water well in oil field |
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| RU2811215C1 (en) * | 2023-06-22 | 2024-01-11 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Downhole pumping unit with cleanable filter |
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Application publication date: 20210416 |