CN107605434B - Descaling system and descaling method for high-pressure water injection pipe of oil field - Google Patents
Descaling system and descaling method for high-pressure water injection pipe of oil field Download PDFInfo
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- CN107605434B CN107605434B CN201710972189.4A CN201710972189A CN107605434B CN 107605434 B CN107605434 B CN 107605434B CN 201710972189 A CN201710972189 A CN 201710972189A CN 107605434 B CN107605434 B CN 107605434B
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Abstract
The invention discloses a descaling system and a descaling method for a high-pressure water injection pipe of an oil field. The system comprises a high-pressure scale sucking pipe, an induction pipe penetrating through the center of the high-pressure scale sucking pipe, a pulse transducer, a controller, an induction power supply, a high-pressure isolator and a sealing device, wherein the pulse transducer is arranged on the outer side of the pipe wall of the high-pressure scale sucking pipe, the technology of electric induction pre-deposition is adopted, the problem of scale of a high-pressure filling system is thoroughly solved, firstly scale forming substances in fluid are rapidly deposited, and then the pulse transducer is used for stripping and high-pressure water is used for flushing the scale. The invention has the beneficial effects that: the fault points are reduced, and the requirements of long-term installation and stable operation required by the oil extraction field of the oil field are met; the modular design can conveniently increase and decrease the processing modules so as to meet the on-site descaling and antiscaling requirements; automatic operation is realized, and manual operation is not needed; no chemical agent is needed to be added, and no pollution is caused to the environment.
Description
Technical Field
The invention relates to the technical field of matched processes of oilfield separate-layer water injection development technology, in particular to a descaling system and a descaling method for oilfield high-pressure water injection pipes.
Background
The smoothness of the separate injection well shaft is a basic condition for ensuring the later normal measurement and adjustment, but as the service time of the separate injection well water injection pipe column is prolonged, the separate injection well measurement and adjustment is affected by factors such as scale formation, corrosion and the like of the well shaft, the separate injection well measurement and adjustment frequently occurs when encountering resistance, and the instrument tool falls off from part of the well, so that the later overhaul and maintenance cost such as pressurized operation and the like are caused, and the orderly development of the separate injection measurement and adjustment work is affected.
On one hand, the traditional descaling technology relies on tools such as a steel wire carrying scalers and a drift size gauge to lower a shaft to remove scales in a manner of impact, impact and the like, belongs to a passive impact type mechanical descaling technology, and is relatively low in descaling efficiency due to the fact that manual experience is mostly relied on. Especially, in the bridge type concentric dispensing process application, the dispensing measurement and adjustment efficiency is seriously affected by the low-efficiency mechanical descaling technology. On the other hand, the injected chemical reagent is combined to generate dirt in a precipitation form, the scaling speed of the dirt is more than ten times higher than that of common water injected in secondary oil extraction, the scaling not only causes pipeline blockage of a ground system and increases back pressure, but also causes the pump detection period of a mechanical oil extraction well to be too short, the yield is influenced, and the energy consumption of oil extraction and ground gathering and transportation is increased. Scaling also has the following hazards to oilfield oil and gas wells and gathering and transporting systems:
1) Scaling of near-wellbore zones and hydrocarbon reservoirs, direct blockage of the hydrocarbon reservoir void channels, reduction of hydrocarbon reservoir permeability, increase of fluid flow resistance, and reduction of oil well production;
2) After the water injection well and water injection equipment are scaled and blocked, the water flow resistance is increased, the cost is increased, the energy transmission water injection pressure is increased, and the water injection exploitation effect is affected;
3) After the scale of the oil and gas reservoir is blocked, the normal operation of oil well equipment facilities is affected, such as the blockage of the scale on equipment such as a well hole, an oil pipe, a valve, a ground gathering pipeline and the like, and the well is shut in under severe conditions;
4) In the oil extraction process, the sucker rod of the oil pumping unit is scaled, and the load of the sucker rod is increased to reduce the working efficiency of the oil pump;
5) The scale of the gathering and transportation pipeline and the water injection equipment can cause local scale corrosion of the equipment and the pipeline, and oil pipe explosion is easy to cause.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-efficiency scale prevention and removal system and a scale removal method in the oil extraction process of an oil field without adding chemical reagents, and the system and the method specifically comprise the following steps:
the utility model provides an oil field high pressure water injection pipe scale removal system, includes high pressure suction pipe, wears to establish the induction pipe in high pressure suction pipe axial department, installs at high pressure suction pipe wall outside pulse transducer, controller, induced power, high pressure isolator, sealing device, high pressure suction pipe both ends are through a branch road inlet tube, a branch road outlet pipe respectively with main inlet tube and main outlet pipe intercommunication, induction pipe one end wears to establish in high pressure suction pipe, and the other end passes through sealing device and high pressure suction pipe sealing connection, induction pipe still is connected with main inlet tube through a dashing dirt inlet tube, high pressure suction pipe one side is connected with main row of dirt pipe through a branch road row of dirt pipe, high pressure isolator installs and makes between induction pipe and the high pressure suction pipe be insulating state between induction pipe between dashing dirt inlet tube, induced power drive high pressure suction pipe and induction pipe operation, the controller drive pulse transducer operation, induced power is exerted high power direct current and square wave signal to high pressure suction pipe and induction pipe, makes high pressure suction pipe positively charge, induction pipe negative ion fluid form the negative ion fluid and negative ion induced to gather in the induction pipe, and the negative ion fluid forms the induced scale fluid and gathers in the induction pipe and the negative ion fluid and forms the induced scale.
Preferably, the induction pipe is uniformly provided with a plurality of small water spraying holes with different angles.
Preferably, the pulse transducer and the high-pressure scale suction pipe are welded at a certain angle.
Preferably, the branch water inlet pipe, the branch water outlet pipe, the scale flushing water inlet pipe and the branch scale discharging pipe are respectively provided with a water inlet electric valve, a water outlet electric valve, a scale flushing electric valve and a scale discharging electric valve.
Preferably, the sealing device is embedded between the high-pressure scale suction pipe and the induction pipe.
Preferably, the start and stop of the water inlet electric valve, the water outlet electric valve, the scale flushing electric valve, the scale discharging electric valve and the pulse transducer are controlled and driven by output signals of the controller.
Preferably, the oil field high-pressure water injection pipe descaling system can be used in a plurality of parallel or serial modes.
A descaling method using an oilfield high-pressure water injection pipe descaling system, the descaling step comprising:
s1, analyzing the concentration and the components of ions in fluid, and selecting a corresponding high-pressure scale suction pipe and a matched oil field high-pressure water injection pipe scale removal system;
s2, starting an induction power supply to apply high-power direct current and square wave signals to the high-voltage scale suction pipe and the induction pipe, so that the high-voltage scale suction pipe is negatively charged and the induction pipe is positively charged, and a scale induction electric field is formed;
s3, the controller sends out a signal, the water inlet electric valve and the water outlet electric valve are opened, negative ions are accumulated on the induction pipe under the action of the induction electric field, positive ions are accumulated on the high-pressure scale suction pipe and are combined with the loaded ions near the high-pressure scale suction pipe in the fluid to form scale;
and S4, after the electro-deposition is finished, closing an induction power supply, sending a signal by a controller to close a water inlet electric valve and a water outlet electric valve, opening the controller, the scale flushing electric valve and the scale discharging electric valve, generating variable-frequency moving long-pulse power ultrasonic energy waves by a pulse transducer to peel off scales on the wall of the high-pressure scale suction pipe, cleaning the scales by combining high-pressure water flow sprayed by small holes of the induction pipe, and discharging the scales out of the high-pressure scale suction pipe.
The invention has the beneficial effects that: 1) The technology of electric induction pre-deposition is adopted to thoroughly solve the dirt problem of a high-pressure filling system; 2) The pressure-bearing pipeline is used as a negative electrode for inducing deposition and scale deposition, and the scale is directly and rapidly deposited on the inner wall, so that various positive and negative ions can be adsorbed to form insoluble inorganic salt scale; 3) The high-pressure water pipe processed by special materials and processes is used as an anode for inducing sedimentation and scaling, a plurality of small holes which form a certain angle are formed on the inducing pipe and are used as high-pressure water nozzles for removing scaling, and the system has the advantages of simple structure, few fault points, long service life and convenient use; 4) The high-power long-pulse power ultrasonic energy wave rapid stripping technology is adopted, a plurality of long-pulse ultrasonic transducers are arranged on the outer wall of the pressure-bearing pipeline, various dirt deposited on the inner wall of the pipeline can be rapidly stripped off on the premise of ensuring that no rotating part exists in the pressure-bearing pipeline, fault points are reduced to the greatest extent, and the long-term installation and stable operation requirements required by the oil field oil extraction field are met; 5) The modular design can conveniently increase and decrease the processing modules so as to meet the on-site descaling and antiscaling requirements; 6) Automatic operation is realized, and manual operation is not needed; 7) The pure physical method does not add any chemical agent and has no secondary pollution problem.
Drawings
FIG. 1 is a schematic diagram of a descaling system module for a high-pressure water injection pipe in an oil field.
FIG. 2 is a schematic diagram of a combination of modules of a descaling system for a high-pressure water injection pipe in an oil field.
In the figure: 1-a high-pressure scale suction pipe; 2-guiding tube; 3-pulse transducer; 4-a controller; 5-an induction power supply; 6, a main water inlet pipe; 6.1-branch water inlet pipe; 6.2-a scale flushing water inlet pipe; 7-a high voltage isolator; 8-a sealing device; 9-a main water outlet pipe; 9.1-branch water outlet pipe; 9.2-a main scale removing pipe; 9.3-branch scale removing pipe; 10-an electric valve for water inflow; 11-a water outlet electric valve; 12-a scale flushing water electric valve; 13-a scale removal electric valve.
Detailed Description
The objects of the present invention will be described in further detail with reference to the accompanying drawings and specific examples, which are not to be construed as being limiting the embodiments of the present invention.
As shown in figure 1, the descaling system for the oilfield high-pressure water injection pipe comprises a high-pressure scale suction pipe 1, an induction pipe 2, a pulse transducer 3, a controller 4, an induction power supply 5, a main water inlet pipe 6, a branch water inlet pipe 6.1, a scale flushing water inlet pipe 6.2, a high-pressure isolator 7, a sealing device 8, a main water outlet pipe 9, a branch water outlet pipe 9.1, a main scale discharge pipe 9.2, a branch scale discharge pipe 9.3, a water inlet electric valve 10, a water outlet electric valve 11, a scale flushing electric valve 12 and a scale discharge electric valve 13.
The high-pressure scale suction pipe 1 is respectively connected with the main water inlet pipe 6 and the main water outlet pipe 9 through a branch water inlet pipe 6.1 and a branch water outlet pipe 9.1. The branch water inlet pipe 6.1 and the branch water outlet pipe 9.1 are respectively provided with a water inlet electric valve 10 and a water outlet electric valve 11. The induction pipe 2 is arranged at the axial position in the high-pressure scale suction pipe 1, one end of the induction pipe 2 is in sealing connection with one end of the high-pressure scale suction pipe 1 through the sealing device 8, so that on one hand, the impact of high water pressure of the induction pipe 2 can be reduced, and on the other hand, the high-pressure scale suction pipe 1 and the induction pipe 2 can be fully in an insulating state. A high-voltage isolator 7 is arranged between the induction pipe 2 and the scale flushing water inlet pipe 6.2, so that the tail end of the induction pipe 2 is effectively ensured to be in an insulating state, and the scale flushing water inlet pipe 6.2 is connected with the main water inlet pipe 6. The high-pressure scale suction pipe 1 is connected with the main scale discharge pipe 9.2 through the branch scale discharge pipe 9.3, and the branch scale discharge pipe 9.3 is also provided with a scale discharge electric valve 13. As shown in fig. 1, a plurality of pulse transducers 3 are installed at a certain angle along the axial direction on the outer side of the high-pressure scale suction pipe 1, and the pulse transducers 3 are ultrasonic wavelength pulse transducers, so as to quickly peel off various scales deposited on the inner wall of the high-pressure scale suction pipe 1. The pulse transducer 3 is driven by the controller 4 to generate variable-frequency moving long-pulse power ultrasonic energy waves, the energy waves are transmitted to the high-pressure scale suction pipe 1 through welding spots, so that metal wall particles of the high-pressure scale suction pipe 1 produce microscopic motions such as high-frequency elliptical motions, and the like, and a large shearing force is generated between dirt and the metal wall as a result of the operation, so that the shearing force has very good stripping capability, and dirt different from the metal wall can be stripped rapidly, and particularly, the stripping effect on the dirt with high hardness and adhesion force is better and more effective.
The working principle of the invention
(1) Deposition of dirt
At this time, as shown in fig. 1, the controller 4 issues a command to open the electric valves 10 and 11 and to control the electric valves 12 and 13 to be in a closed state. The fluid passes through a dirt precipitation and deposition loop system consisting of a main water inlet pipe 6, a branch water inlet pipe 6.1, a water inlet electric valve 10, a high-pressure dirt suction pipe 1, a branch water outlet pipe 9.1 and a main water outlet pipe 9. The induction power supply 5 supplies power to the high-voltage scale suction pipe 1 and the induction pipe 2 simultaneously.
The high-voltage scale sucking pipe 1 and the induction pipe 2 form a scale induction electric field through high-power direct current and square wave signals applied by the induction power supply 5, namely the high-voltage scale sucking pipe 1 has a large amount of negative charges, and the scale induction pipe 2 has a large amount of positive charges. When the fluid flows through, under the action of an induced electric field, the dirt induction pipe 2 carries a large amount of positive charges, so that positive ions to be formed into dirt in the fluid generate repulsive force and rapidly move to the high-pressure dirt suction pipe 1; since the high-pressure scale suction pipe 1 has a large amount of negative charges, various positive ions in the fluid can be adsorbed; because the fluid is alkaline liquid and contains a large amount of anions such as carbonate, sulfate radical and the like, a large amount of positive and negative ions are combined to generate insoluble substances near the inner wall of the high-pressure scale suction pipe 1 and are attached to the inner wall of the high-pressure scale suction pipe 1, so that the purpose of scale removal is achieved.
The research result shows that the time for positive ions to migrate to the inner wall of the high-pressure scale suction pipe 1 is influenced by the fluid state, the induced electric field parameters, the migration distance and other factors, and the induced electric field parameters and the specification and the size of the high-pressure scale suction pipe 1 can be adjusted according to the on-site fluid state.
The induction pipe 2 and the inside of the high-pressure scale suction pipe 1 can be provided with a proper insoluble fixed bracket according to the actual operation requirement.
(2) Dirt removal process
As shown in fig. 1, the controller 4 issues a command to control the electric valves 10 and 11 to be in a closed state and to control the electric valves 12 and 13 to be in an open state. At this time, the controller 4 sends out instructions to drive the ultrasonic wavelength pulse transducer 3, fluid sequentially passes through the main water inlet pipe 6, the scale flushing water inlet pipe 6.2, the scale flushing electric valve 12 and the high-pressure isolator 7 to enter the induction pipe 2 and then jet high-pressure water to the high-pressure scale suction pipe 1, and the removed scale is discharged through a scale removing loop system formed by the branch scale removing pipe 9.3, the scale removing electric valve 13 and the main scale removing pipe 9.2.
In order to quickly remove the peeled dirt, the induction pipe 2 plays a role of a high-pressure water gun, the pulse transducer 3 starts to work, and meanwhile, the induction pipe 2 is filled with high-pressure water, and as a plurality of small water spraying holes with different angles are formed in the dirt induction pipe 2, the high-pressure water can be sprayed on the inner wall of the high-pressure dirt suction pipe 1 at a high speed, so that dirt which is peeled from a metal wall surface is quickly impacted and flows out of the high-pressure dirt suction pipe 1 under the action of high-pressure water jet, and enters a sedimentation tank through the dirt discharge pipe 9.2.
After the descaling and the descaling are finished, the system is restored to the adsorption and deposition process of the dirt under the control of the controller 4, so that the dirt forming substances in the fluid are adsorbed and removed in a circulating and reciprocating mode, the fluid is softened, the trouble of no dirt pollution problem in the subsequent gathering and conveying process is guaranteed, and the guarantee is provided for stable production and high-efficiency oil production of the oil field.
(3) System linkage process
When the scaling speed is too high or the scaling amount is large in the oilfield gathering and transportation process, a plurality of oilfield high-pressure water injection pipe descaling systems can be used in parallel or in series.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the invention.
Claims (8)
1. The utility model provides an oil field high pressure water injection pipe scale removal system, includes high pressure inhale dirt pipe (1), wears to establish induction tube (2) in high pressure inhale dirt pipe (1) axle center department, installs pulse transducer (3), controller (4), induction power (5), high pressure isolator (7), sealing device (8) in high pressure inhale dirt pipe (1) pipe wall outside, its characterized in that:
the two ends of the high-pressure scale suction pipe (1) are respectively communicated with the main water inlet pipe (6) and the main water outlet pipe (9) through the branch water inlet pipe (6.1) and the branch water outlet pipe (9.1);
one end of the induction pipe (2) is arranged in the high-pressure scale suction pipe (1) in a penetrating way, the other end of the induction pipe is connected with the high-pressure scale suction pipe (1) in a sealing way through a sealing device (8), and the induction pipe (2) is connected with the main water inlet pipe (6) through a scale flushing water inlet pipe (6.2);
one side of the high-pressure scale suction pipe (1) is connected with the main scale discharge pipe (9.2) through a branch scale discharge pipe (9.3);
the high-voltage isolator (7) is arranged between the induction pipe (2) and the scale flushing water inlet pipe (6.2), so that the tail end of the induction pipe (2) is effectively ensured to be in an insulating state;
the induction power supply (5) drives the high-pressure scale suction pipe (1) and the induction pipe (2) to operate;
the induction power supply (5) applies high-power direct current and square wave signals to the high-voltage scale suction pipe (1) and the induction pipe (2) to enable the high-voltage scale suction pipe (1) to be negatively charged and the induction pipe (2) to be positively charged, so that a scale induction electric field is formed, ions with negative charges in the fluid are accumulated on the induction pipe (2) under the action of the induction electric field, and the positively charged ions are accumulated on the high-voltage scale suction pipe (1) and are combined with negative ions in the fluid to form scales;
the controller (4) drives the pulse transducer (3) to strip dirt on the high-pressure dirt suction pipe (1).
2. The descaling system for the oilfield high-pressure water injection pipe according to claim 1, wherein the induction pipe (2) is uniformly provided with a plurality of small water injection holes.
3. The descaling system for the high-pressure water injection pipe of the oil field, according to claim 1, wherein the pulse transducer (3) and the high-pressure water suction pipe (1) are welded at a certain angle.
4. The descaling system for the oilfield high-pressure water injection pipe according to claim 1, wherein the branch water inlet pipe (6.1), the branch water outlet pipe (9.1), the scale flushing water inlet pipe (6.2) and the branch scale discharging pipe (9.3) are respectively provided with a water inlet electric valve (10), a water outlet electric valve (11), a scale flushing electric valve (12) and a scale discharging electric valve (13).
5. An oilfield high-pressure water injection pipe descaling system according to claim 1, wherein the sealing device (8) is embedded between the high-pressure scale suction pipe (1) and the induction pipe (2).
6. The descaling system for the oilfield high-pressure water injection pipe, according to claim 4, wherein the starting and stopping of the water inlet electric valve (10), the water outlet electric valve (11), the scale flushing electric valve (12), the scale discharging electric valve (13) and the pulse transducer are controlled and driven by output signals of the controller (4).
7. An oilfield high-pressure water injection pipe descaling system according to claim 1, which can be used in a plurality of parallel or series connection modes.
8. A descaling method implemented by the oilfield high-pressure water injection pipe descaling system of claim 1, wherein the descaling step comprises:
s1, analyzing the concentration and the components of ions in fluid, and selecting a corresponding high-pressure scale suction pipe (1) and a matched oil field high-pressure water injection pipe scale removal system;
s2, starting an induction power supply (5) to apply high-power direct current and square wave signals to the high-voltage scale suction pipe (1) and the induction pipe (2) so that the high-voltage scale suction pipe (1) is negatively charged and the induction pipe (2) is positively charged, and forming a scale induction electric field;
s3, a controller (4) sends out a signal, a water inlet electric valve (10) and a water outlet electric valve (11) are opened, negative ions are accumulated on an induction pipe (2) under the action of an induction electric field, positive ions are accumulated on a high-pressure scale suction pipe (1) and are combined with loaded ions close to the high-pressure scale suction pipe (1) in the fluid to form scale;
s4, after electro-deposition is finished, the induction power supply (5) is closed, the controller (4) sends out a signal to close the water inlet electric valve (10) and the water outlet electric valve (11), the controller (4), the scale flushing electric valve (12) and the scale discharging electric valve (13) are opened, the pulse transducer (3) generates variable-frequency moving long-pulse power ultrasonic energy waves to peel off the scale on the pipe wall of the high-pressure scale suction pipe (1), the scale is cleaned by combining the high-pressure water flow sprayed by the small holes of the induction pipe (2), and the scale is discharged out of the high-pressure scale suction pipe (1).
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| CN111472720A (en) * | 2019-01-23 | 2020-07-31 | 宁夏通领环保科技有限公司 | Equipment for removing dirt from oil exploitation shaft |
| CN110668584A (en) * | 2019-11-14 | 2020-01-10 | 柳新林 | Rare earth permanent magnet scale inhibition system capable of realizing automatic cleaning and scale inhibition method thereof |
| CN111186918B (en) * | 2020-02-17 | 2024-02-20 | 罗光政 | Adjustable turbulence scale inhibitor and scale inhibition method |
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