CN115263241A - Down-hole turbulent flow long-acting corrosion-proof and scale-proof device - Google Patents
Down-hole turbulent flow long-acting corrosion-proof and scale-proof device Download PDFInfo
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- CN115263241A CN115263241A CN202210942059.7A CN202210942059A CN115263241A CN 115263241 A CN115263241 A CN 115263241A CN 202210942059 A CN202210942059 A CN 202210942059A CN 115263241 A CN115263241 A CN 115263241A
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- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 230000005764 inhibitory process Effects 0.000 claims abstract description 9
- 238000005536 corrosion prevention Methods 0.000 claims abstract description 5
- 229940079593 drug Drugs 0.000 claims description 40
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- 230000003373 anti-fouling effect Effects 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract 1
- 239000003129 oil well Substances 0.000 description 20
- 230000007797 corrosion Effects 0.000 description 12
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- 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
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Abstract
The invention provides an underground turbulent flow long-acting anti-corrosion and anti-corrosion device, which relates to the technical field of oil field production equipment and comprises a medicine storage pipe for temporarily storing a solid slow-release scale inhibition rod and a medicine release pipe for releasing medicine outwards, wherein the medicine storage pipe and the medicine release pipe are both arranged at the tail end of a production pipe column in a sleeve along the axial direction, the combined structure of the traditional production pipe column is changed, the medicine storage pipe is arranged above the medicine release pipe and is in a conducting state, a medicine release channel is arranged on the medicine release pipe, and the medicine to be released is released outwards through the medicine release channel. The solid slow-release scale inhibition rod releases the medicine into the sleeve through the medicine release channel, so that the long-acting release of the medicine is realized, and the solid slow-release scale inhibition rod is arranged at the tail end of the sleeve and is far away from the pump cylinder, so that the defect of secondary downhole operation caused by blockage of the pump cylinder due to the temperature of a shaft, different well conditions and the action of liquid level is overcome, and the corrosion prevention and scale prevention at the forefront end of the shaft are realized.
Description
Technical Field
The invention relates to the technical field of oil field oil extraction equipment, in particular to an underground turbulent flow anti-scaling and anti-corrosion device.
Background
The oil field development faces the threat of corrosion and scaling, and the oil gas exploitation well bore pipe column contains Ca due to high mineralization degree of stratum fluid 2+ 、Mg 2+ 、Ba 2+ 、Sr 2+ Scale-forming cations, with SO contained in other producing horizons 4 2- 、HCO 3- 、CO 3 2- Scaling anion reaction, the content of scaling ions is different between different fluids, and the mixing in the well bore can cause scaling problems. Carbonates in the formation may also produce natural scaling due to changes in temperature pressure in the wellbore. Meanwhile, the medium in the oil field pipeline is rich in CO 2 、H 2 S, high salinity salt and other corrosive substances, the corrosion is strong, and the corrosion and the damage of the shaft pipe column are serious. On-site investigation finds that the corrosion failure of the oil pipe is mainly characterized by local perforation damage, a plurality of deep corrosion pits are often formed below the scaling product, even the perforation damage, and the corrosion and the scaling have great correlation.
Taking a certain oil reservoir in production development as an example, the daily liquid production amount is 1069m at 359 hole of a production oil well at present 3 The oil mass is 349t, the comprehensive water content is 61.1 percent, various contradictions of a shaft are gradually highlighted along with the extension of water injection development time in an area, the conditions are increasingly complex, the comprehensive water content of an oil well rises, the formation temperature and pressure change, so that the natural scaling speed of the shaft is accelerated, the number of oil well scaling wells is in a trend of increasing year by year, the number of block scaling wells in recent years is totally 99, accounts for 27.6 percent of the total open wells, 30 severely scaled wells account for 8.4 percent of the total open wells, the annual operation is stopped for 110 wells due to scaling, mainly shows that pumps are blocked, ball seat scaling leakage, screen pipes and pump cylinders are blocked, accounts for 28.8 percent of the total operating wells, becomes the main contradiction of shaft management, seriously influences the normal production of the oil field and brings great difficulty to the shaft management.
The conventional corrosion-resistant and scale-resistant means for treating the prior mineshaft comprises the following steps:
firstly, ground is watered impact and is thrown chemical and summer sleeve pipe bit and throw, and ground is watered in winter and is thrown chemical and have following four aspect problems: (1) the labor intensity of workers is greatly increased; (2) due to the limitation of regional environment, water taking is very difficult and the cost is high; (3) workers are at risk of chemical poisoning and splashing of chemicals to the eyes; (4) the regular adding can not be realized in rainy season and road problems. The dripping of the sleeve in summer has the following problems: (1) because the average pumping of the oil wells in the current area is about 1500m, the medicines cannot effectively reach the liquid level due to the well depth problem during the ground drop feeding, most of the medicines are infiltrated and absorbed by the sleeve above the liquid level, and the medicine waste is caused and no effect is produced; (2) medicines and water need to be transported regularly for configuration, and water taking is difficult and high in cost due to regional environment limitation; (3) the management difficulty is high, the unattended well station has the problem that dosing equipment is lost, and environmental pollution can be caused; (4) the opening of the outlet valve of the medicine is not easy to control, and the uniform drip feeding is difficult to realize.
Secondly, a solid slow-release scale inhibition rod is directly added in combination with a pump detection shaft sleeve, the purposes of deep long-acting corrosion prevention and scale prevention cannot be effectively achieved due to large underground temperature gradient, different well conditions of each well and the action of a shaft working fluid level, and after 2 wells are applied, a pump cylinder and a ball seat are blocked due to the dilution of the slow-release scale inhibition rod and the pumping action of the pump cylinder, so that secondary underground operation is caused, the rework rate is high, and certain influence is brought to the production operation of an operation area.
Disclosure of Invention
In view of the above, the present invention aims to provide an underground turbulent flow anti-scaling and anti-corrosion device, which solves the technical problems of secondary underground operation caused by blockage of a pump cylinder due to the effects of wellbore temperature, different well conditions and liquid level in the prior art in which a slow-release scale-inhibiting rod is directly added to a wellbore casing, and various difficulties in corrosion and scale prevention of a wellbore by adding a chemical agent into ground water.
In order to achieve the purpose, the invention provides a downhole turbulent flow anti-scaling and anti-corrosion device which comprises a medicine storage tube and a medicine release tube, wherein the medicine storage tube is used for temporarily storing a solid slow-release scale-inhibiting rod, the medicine release tube is used for releasing medicines outwards, the medicine storage tube and the medicine release tube are both arranged at the tail end of the inner part of a sleeve along the axial direction, the medicine storage tube is arranged above the medicine release tube and is in a conducting state, a medicine release channel is arranged on the medicine release tube, and the medicines to be released are released outwards through the medicine release channel.
Preferably, the drug storage tube and the drug release tube are integrally formed or detachably connected.
Preferably, the drug storage tube and the drug release tube are releasably connected by a collar.
Preferably, the medicine release channel is formed in a linear or spiral shape.
Preferably, the drug release passage continuously decreases in width from inside the drug release tube to outside the drug release tube.
Preferably, still include the liquid spoiler, the liquid spoiler is arranged in the top of medicine release pipe, and is equipped with the liquid vortex hole that link up, the liquid vortex hole is used for the water conservancy diversion makes the liquid that solid slowly-releasing hinders dirty stick slowly-releasing.
Preferably, the liquid-disturbing hole has a tapered configuration.
Preferably, the liquid spoiler conforms to a cross-sectional shape of the drug storage tube and has a diameter smaller than a diameter of the drug storage tube.
Preferably, the drug delivery device further comprises a blocking cap, and the blocking cap is sleeved at the bottom end of the drug release tube.
Preferably, a pressure transmission hole is formed in the plugging cap.
The invention provides an underground turbulent flow anti-scaling and anti-corrosion device, which has the following technical effects:
the invention discloses an underground turbulent flow anti-scaling and anti-corrosion device, which mainly comprises a medicine storage pipe and a medicine release pipe, wherein the medicine storage pipe is used for temporarily storing a solid slow-release scale inhibition rod, the medicine release pipe is used for releasing medicines outwards, the medicine storage pipe and the medicine release pipe are both arranged at the tail end inside a sleeve along the axial direction, the medicine storage pipe is arranged above the medicine release pipe and is in a conduction state, and a medicine release channel is arranged on the medicine release pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic perspective view of a down-hole turbulent flow anti-scaling and anti-corrosion device in embodiment 1 of the invention;
FIG. 2 is a schematic perspective view of a down-hole turbulent flow anti-scaling and anti-corrosion device in embodiment 2 of the invention;
FIG. 3 is a longitudinal sectional view of embodiment 1 or embodiment 2;
FIG. 4 is a schematic perspective view of a down-hole turbulent flow anti-scaling and anti-corrosion device in embodiment 3 of the invention;
FIG. 5 is a schematic perspective view of a down-hole turbulent flow anti-scaling and anti-corrosion device in embodiment 4 of the invention;
FIG. 6 is a longitudinal sectional view of examples 3 and 4;
FIG. 7 is a state diagram of use of embodiment 1, embodiment 2, embodiment 3 and embodiment 4;
FIG. 8 is a histogram of daily production of oil wells before and after completion;
FIG. 9 is a histogram comparing the frequency of well operations before and after completion;
FIG. 10 is a histogram comparing cost of downhole operations before and after completion;
FIG. 11 is a histogram comparing the pumping cycles of wells before and after completion of the set.
Wherein, fig. 1-11:
1. an underground turbulent flow anti-scaling and anti-corrosion device; 10. a solid slow-release scale inhibition rod; 11. a drug storage tube; 12. a drug release tube; 121. a linear release channel; 122. a helical relief channel; 13. a liquid spoiler; 131. a liquid-turbulence orifice; 14. a plugging cap; 141. a pressure transfer hole; 15. a hoop cover;
2. a sand setting pipe; 3. an eye tube; 4. a tail pipe; 5. an oil pipe; 6. and (4) sleeving the sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
As described in the background art, the conventional corrosion and scale prevention means for treating a shaft in the prior art is to directly add a slow-release scale inhibiting rod into a shaft sleeve, and still cannot effectively achieve the purpose of deep long-acting corrosion and scale prevention due to the effects of shaft temperature, different well conditions and liquid level.
Based on the above, the invention provides an underground turbulent flow antiscale and anticorrosive device, which mainly comprises a medicine storage pipe and a medicine release pipe, wherein the medicine storage pipe is used for temporarily storing a solid slow-release antiscale rod, and the medicine release pipe is used for releasing medicines outwards.
As shown in fig. 7, which is a schematic view of an application pipe column of the downhole turbulent flow anti-scaling and anti-corrosion device 1 of the present invention, a casing 6 is provided in an oil well, the casing 6 extends from a well head to a well bottom, that is, the lower depth of the casing 6 is 1651m, an oil pipe 5, a tail pipe 4, an eye pipe 3, a sand-sinking pipe 2, and the downhole turbulent flow anti-scaling and anti-corrosion device 1 are sequentially provided in the casing 6 from top to bottom, the diameters of the oil pipe 5, the tail pipe 4, the eye pipe 3, and the sand-sinking pipe 2 are 73mm, the length of the oil pipe 5 is 1500m, an oil-well pump is provided in the oil pipe 5, the diameter of the oil-well pump is 32mm, and the oil-pumping mode is a common oil-pumping mode in the prior art, which is not described in detail herein.
The technical solution of the present invention will be described in detail with reference to specific examples.
Example 1:
as shown in fig. 1 and fig. 3, a schematic structural diagram of a downhole turbulent flow anti-scaling and anti-corrosion device 1 is provided for the present embodiment, the downhole turbulent flow anti-scaling and anti-corrosion device 1 includes a medicine storage tube 11 and a medicine release tube 12, the medicine storage tube 11 is located above the medicine release tube 12, the medicine storage tube 11 is communicated with the medicine release tube 12, and the medicine storage tube 11 is connected with the end of a sand settling tube, the medicine storage tube 11 is used for temporarily storing a solid slow-release anti-scaling rod 10, and the medicine release tube 12 is used for releasing a medicine into a casing 6.
Specifically, as shown in fig. 1 and 3, a drug release channel is provided on the drug release pipe 12, when the liquid in the sand settling pipe flows to the drug storage pipe 11, the solid slow-release scale inhibition rod 10 composed of the high-efficiency scale inhibitor, the framework proppant, the dissolution rate regulator and a small amount of active agent is slowly dissolved along with the soaking and scouring of the downhole fluid, the high-efficiency corrosion and scale inhibitor is continuously released, the efficient corrosion and scale inhibitor is released into the casing 6 through the drug release channel, the formation of downhole scale is prevented through the effects of adsorption, chelating and dispersion, and the like, and the effects of corrosion prevention and scale prevention of the well bore of the oil-water well are achieved through the source control of oil well exploitation.
In the embodiment, the medicine storage tube 11 and the medicine release tube 12 are detachably connected, specifically, the medicine storage tube 11 and the medicine release tube 12 are detachably connected through the ferrule 15, as shown in fig. 1 and 3, the solid slow-release scale inhibiting rod 10 is separately stored in the medicine storage tube 11, and the medicine release tube 12 is separately present.
The medicine releasing channels on the medicine releasing pipe 12 are straight releasing channels 121, the length and number of the straight releasing channels 121 are determined according to the length of the solid slow-release scale inhibiting rod 10 and the depth of the oil well, for example, four straight releasing channels 121 may be provided, and the length and number of the straight releasing channels 121 are not limited in the present invention, as long as the medicine can be released through the straight releasing channels 121, and the protection scope of the present invention is included.
Further, in order to prevent particles in the casing 6 from flowing backward into the medicine release tube 12 through the straight release path 121, the width of the medicine release path decreases continuously from inside the medicine release tube 12 to outside the medicine release tube 12.
Further, as shown in fig. 3, the scale inhibitor further comprises a liquid spoiler 13, the liquid spoiler 13 is disposed at the top end of the medicine release pipe 12 and is used for separating the medicine release pipe 12 from the sand settling pipe 2, the liquid spoiler 13 is provided with a through liquid spoiler hole 131, and the liquid spoiler hole 131 is used for guiding liquid for slowly releasing the scale inhibitor 10.
As shown in fig. 3, in order to prevent sand in the sand settling tube from flowing into the medicine storage tube 11 along with the liquid, the liquid disturbing hole 131 has a tapered structure, and the liquid disturbing hole 131 having the tapered structure can block the sand to some extent.
In addition, the cross-sectional shapes of the liquid spoiler 13 and the drug storage tube 11 are consistent and are both circular, the diameter of the liquid spoiler 13 is smaller than the inner diameter of the drug storage tube 11, and the liquid spoiler 13 is horizontally arranged inside the drug storage tube 11 to achieve the purpose of separating and blocking the sand sinking tube and the drug storage tube 11.
Further, as shown in fig. 1 and 3, a blocking cap 14 is further included, and the blocking cap 14 is sleeved on the bottom end of the medicine release tube 12 and is in threaded connection with the medicine release tube 12.
Be equipped with pressure transmission hole 141 on the shutoff cap 14, because medicine release pipe 12 has certain degree of depth in the oil well, consequently, medicine release pipe 12 receives great pressure, adopt the mode that is equipped with pressure transmission hole 141 on shutoff cap 14, can make the solid slowly-releasing of medicine storage tube 11 hinder dirty stick 10 and receive certain suspension power effect, last suspension in medicine storage tube 11, reach the purpose of slowly-releasing, in addition, because all have liquid in medicine storage tube 11 and the medicine release pipe 12, liquid can make solid slowly-releasing hinder dirty stick 10 and have certain buoyancy.
Wherein, table 1 is the comparative data before and after the downhole turbulent flow anti-scaling and anti-corrosion device 1 is used.
White 461 Yan 9 1 The block pit shaft is seriously corroded and scaled, which brings great threat to daily pit shaft management and production operation cost, aiming at the serious current situation, 10 wells are applied to the development block by combining a pump detection, the application effect is unexpected, economic benefit 584 ten thousand yuan is generated in cumulative years, the cost of downhole operation is saved by 82.4 ten thousand yuan, and each item isThe marks all show an ascending trend.
As shown in fig. 8, compared with the histogram for the daily oil production of the oil well before and after the matching, after the matching of the device of the embodiment, the most efficient corrosion prevention and scale prevention of the oil well production at the forefront end are realized, and the scaling of the pump barrel, the eye pipe 3 and the ball seat is prevented, so that the pump leakage is reduced, the daily oil production of a single well is improved, the daily oil production is increased by 4t, and the economic benefit 584 ten thousand (4 x 4000 x 365) is generated by annual accumulation.
As shown in fig. 9, a histogram is compared for the operation frequency of the oil wells before and after the completion of the completion, and after the completion of the apparatus of this embodiment, the workover frequency of 10 oil wells is greatly reduced from the previous 48 wells to 4 wells, and the process index shows a greatly reduced trend.
As shown in fig. 10, in order to compare the working costs before and after the completion of the operation, the working costs of 10 wells are reduced from 86.4 ten thousand yuan to 4 ten thousand yuan after the completion of the operation of the apparatus of this embodiment, which provides a strong guarantee for the production cost control of the operation area.
As shown in fig. 11, in order to match the period comparison bar charts of the oil well pump detection before and after the completion of the oil well pump detection, after the device of this embodiment is matched, the pump detection period of 10 oil wells is greatly increased from the previous 81 days to 318 days (continuous), and the process index shows a good running trend.
Example 2:
the difference between the present embodiment and embodiment 1 is that, as shown in fig. 2, the medicine releasing channels on the medicine releasing tube 12 are spiral releasing channels 122, and the length and number of the spiral releasing channels 122 are determined according to the length of the solid slow-release scale inhibiting rod 10 and the depth of the oil well, and may be, for example, three spiral releasing channels 122.
The present invention is not limited to the length or number of the helical delivery channels 122, and it is within the scope of the present invention to deliver the agent through the helical delivery channels 122.
Example 3:
the difference between this embodiment and embodiment 1 is that, as shown in fig. 4 and 6, the medicine storage tube 11 and the medicine release tube 12 of this embodiment are integrally formed, that is, the medicine storage tube 11 and the medicine release tube 12 are a single tube, and the solid slow-release scale inhibiting rod 10 is located above the tube (the solid slow-release scale inhibiting rod 10 is acted by liquid suspension force).
Example 4:
the present embodiment is different from embodiment 3 in that, as shown in fig. 4 and fig. 6, the medicine releasing channels on the medicine releasing tube 12 are straight releasing channels 121, the length and number of the straight releasing channels 121 are determined according to the length of the solid slow-release scale inhibiting rod 10 and the depth of the oil well, for example, four straight releasing channels 121 may be provided, and the length and number of the straight releasing channels 121 are not limited in the present invention, as long as the medicament can be released through the straight releasing channels 121, which is within the protection scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The underground turbulent flow anti-scaling and anti-corrosion device is characterized by comprising a medicine storage pipe and a medicine release pipe, wherein the medicine storage pipe is used for temporarily storing a solid slow-release scale inhibition rod, the medicine release pipe is used for releasing medicines outwards, the medicine storage pipe and the medicine release pipe are both arranged at the tail end of a production pipe column inside a sleeve along the axial direction, the medicine storage pipe is arranged above the medicine release pipe and is in a conducting state, a medicine release channel is arranged on the medicine release pipe, and the medicines to be released are released outwards through the medicine release channel.
2. The downhole turbulent flow anti-scaling and anti-corrosion apparatus of claim 1, wherein the drug storage tube and the drug release tube are integrally formed or detachably connected.
3. The downhole turbulent flow anti-scaling and anti-corrosion device of claim 2, wherein the drug storage tube and the drug release tube are detachably connected by a ferrule.
4. The downhole turbulent flow anti-scaling and anti-corrosion device of claim 1, wherein the drug release channel is provided in a straight line or in a spiral.
5. The downhole turbulent flow anti-fouling and anti-corrosion apparatus of claim 4, wherein the drug release channel continuously decreases in width from inside the drug release pipe to outside the drug release pipe.
6. The underground disturbed flow anti-scaling and anti-corrosion device according to claim 4, further comprising a liquid disturbed flow plate, wherein the liquid disturbed flow plate is arranged at the top end of the medicine release pipe and is provided with a through liquid disturbed flow hole, and the liquid disturbed flow hole is used for guiding liquid for enabling the solid slow-release scale inhibiting rod to slowly release the liquid.
7. The downhole turbulent flow anti-scaling and anti-corrosion device of claim 6, wherein the liquid turbulent flow hole is of a conical structure.
8. The downhole turbulent flow scale control and corrosion prevention apparatus of claim 6, wherein the liquid spoiler conforms to a cross-sectional shape of the drug storage tube and has a diameter smaller than a diameter of the drug storage tube.
9. The downhole turbulent flow anti-scaling and anti-corrosion device as claimed in any one of claims 1 to 8, further comprising a plugging cap, wherein the plugging cap is sleeved on the bottom end of the drug release pipe.
10. The downhole turbulent flow anti-scaling and anti-corrosion apparatus of claim 9, wherein the plugging cap is provided with a pressure transfer hole.
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| CN202210942059.7A CN115263241A (en) | 2022-08-08 | 2022-08-08 | Down-hole turbulent flow long-acting corrosion-proof and scale-proof device |
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| CN202210942059.7A CN115263241A (en) | 2022-08-08 | 2022-08-08 | Down-hole turbulent flow long-acting corrosion-proof and scale-proof device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117231167A (en) * | 2023-11-09 | 2023-12-15 | 四川圣诺油气工程技术服务有限公司 | Releasing structure of acid liquid dumping cylinder |
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| CN117231167A (en) * | 2023-11-09 | 2023-12-15 | 四川圣诺油气工程技术服务有限公司 | Releasing structure of acid liquid dumping cylinder |
| CN117231167B (en) * | 2023-11-09 | 2024-02-02 | 四川圣诺油气工程技术服务有限公司 | Releasing structure of acid liquid dumping cylinder |
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Application publication date: 20221101 |